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gstreamer/gst/playback/gstparsebin.c
Jan Schmidt c2a91d2cfd playback: Fix a small race on decodebin/parsebin shutdown. 
When shutting down decodebin2 and parsebin, they set their
output pads to flushing, and there is a very small window
where elements might send a sticky event such as a tag event
(which silently fails due to flushing) and then sends a buffer,
and the buffer will return GST_FLOW_ERROR because it can't
forward sticky events. The element will then send an error
message on the bus. This can also happen when elements send EOS
just as shutdown is happening. Since we're about to destroy all
the elements inside parsebin and decodebin anyway, just discard
error messages from them.

A nicer but more difficult fix for GStreamer 2.0 is to make
all event pushing / handling in core return a GstFlowReturn
like buffers do, so we can report a FLUSHING state cleanly.
2017-01-03 02:27:51 +11:00

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/* GStreamer
* Copyright (C) <2006> Edward Hervey <edward@fluendo.com>
* Copyright (C) <2009> Sebastian Dröge <sebastian.droege@collabora.co.uk>
* Copyright (C) <2011> Hewlett-Packard Development Company, L.P.
* Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>, Collabora Ltd.
* Copyright (C) <2013> Collabora Ltd.
* Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>
* Copyright (C) <2015-2016> Centricular Ltd
* @author: Edward Hervey <edward@centricular.com>
* @author: Jan Schmidt <jan@centricular.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-parsebin
*
* #GstBin that auto-magically constructs a parsing pipeline
* using available parsers and demuxers via auto-plugging.
*
* parsebin unpacks the contents of the input stream to the
* level of parsed elementary streams, but unlike decodebin
* it doesn't connect decoder elements. The output pads
* produce packetised encoded data with timestamps where possible,
* or send missing-element messages where not.
*
* <emphasis>parsebin is still experimental API and a technology preview.
* Its behaviour and exposed API is subject to change.</emphasis>
*/
/* Implementation notes:
*
* The following section describes how ParseBin works internally.
*
* The first part of ParseBin is its typefind element, which tries
* to determine the media type of the input stream. If the type is found
* autoplugging starts.
*
* ParseBin internally organizes the elements it autoplugged into
* GstParseChains and GstParseGroups. A parse chain is a single chain
* of parsing, this
* means that if ParseBin ever autoplugs an element with two+ srcpads
* (e.g. a demuxer) this will end the chain and everything following this
* demuxer will be put into parse groups below the chain. Otherwise,
* if an element has a single srcpad that outputs raw data the parse chain
* is ended too and a GstParsePad is stored and blocked.
*
* A parse group combines a number of chains that are created by a
* demuxer element.
*
* This continues until the top-level parse chain is complete. A parse
* chain is complete if it either ends with a blocked elementary stream,
* if autoplugging stopped because no suitable plugins could be found
* or if the active group is complete. A parse group on the other hand
* is complete if all child chains are complete.
*
* If this happens at some point, all end pads of all active groups are exposed.
* For this ParseBin adds the end pads, and then unblocks them. Now playback starts.
*
* If one of the chains that end on a endpad receives EOS ParseBin checks
* if all chains and groups are drained. In that case everything goes into EOS.
* If there is a chain where the active group is drained but there exist next
* groups, the active group is hidden (endpads are removed) and the next group
* is exposed. This means that in some cases more pads may be created even
* after the initial no-more-pads signal. This happens for example with
* so-called "chained oggs", most commonly found among ogg/vorbis internet
* radio streams.
*
* Note 1: If we're talking about blocked endpads this really means that the
* *target* pads of the endpads are blocked. Pads that are exposed to the outside
* should never ever be blocked!
*
* Note 2: If a group is complete and the parent's chain demuxer adds new pads
* but never signaled no-more-pads this additional pads will be ignored!
*
*/
/* FIXME 0.11: suppress warnings for deprecated API such as GValueArray
* with newer GLib versions (>= 2.31.0) */
#define GLIB_DISABLE_DEPRECATION_WARNINGS
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst-i18n-plugin.h>
#include <string.h>
#include <gst/gst.h>
#include <gst/pbutils/pbutils.h>
#include "gstplay-enum.h"
#include "gstplayback.h"
#include "gstplaybackutils.h"
/* generic templates */
static GstStaticPadTemplate parse_bin_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate parse_bin_src_template =
GST_STATIC_PAD_TEMPLATE ("src_%u",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS_ANY);
GST_DEBUG_CATEGORY_STATIC (gst_parse_bin_debug);
#define GST_CAT_DEFAULT gst_parse_bin_debug
typedef struct _GstPendingPad GstPendingPad;
typedef struct _GstParseElement GstParseElement;
typedef struct _GstParseChain GstParseChain;
typedef struct _GstParseGroup GstParseGroup;
typedef struct _GstParsePad GstParsePad;
typedef GstGhostPadClass GstParsePadClass;
typedef struct _GstParseBin GstParseBin;
typedef struct _GstParseBinClass GstParseBinClass;
#define GST_TYPE_PARSE_BIN (gst_parse_bin_get_type())
#define GST_PARSE_BIN_CAST(obj) ((GstParseBin*)(obj))
#define GST_PARSE_BIN(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_PARSE_BIN,GstParseBin))
#define GST_PARSE_BIN_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_PARSE_BIN,GstParseBinClass))
#define GST_IS_parse_bin(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_PARSE_BIN))
#define GST_IS_parse_bin_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_PARSE_BIN))
/**
* GstParseBin:
*
* The opaque #GstParseBin data structure
*/
struct _GstParseBin
{
GstBin bin; /* we extend GstBin */
/* properties */
gchar *encoding; /* encoding of subtitles */
guint64 connection_speed;
GstElement *typefind; /* this holds the typefind object */
GMutex expose_lock; /* Protects exposal and removal of groups */
GstParseChain *parse_chain; /* Top level parse chain */
guint nbpads; /* unique identifier for source pads */
GMutex factories_lock;
guint32 factories_cookie; /* Cookie from last time when factories was updated */
GList *factories; /* factories we can use for selecting elements */
GMutex subtitle_lock; /* Protects changes to subtitles and encoding */
GList *subtitles; /* List of elements with subtitle-encoding,
* protected by above mutex! */
gboolean have_type; /* if we received the have_type signal */
guint have_type_id; /* signal id for have-type from typefind */
gboolean async_pending; /* async-start has been emitted */
GMutex dyn_lock; /* lock protecting pad blocking */
gboolean shutdown; /* if we are shutting down */
GList *blocked_pads; /* pads that have set to block */
gboolean expose_allstreams; /* Whether to expose unknow type streams or not */
GList *filtered; /* elements for which error messages are filtered */
GList *filtered_errors; /* filtered error messages */
};
struct _GstParseBinClass
{
GstBinClass parent_class;
/* signal fired when we found a pad that we cannot parse */
void (*unknown_type) (GstElement * element, GstPad * pad, GstCaps * caps);
/* signal fired to know if we continue trying to parse the given caps */
gboolean (*autoplug_continue) (GstElement * element, GstPad * pad,
GstCaps * caps);
/* signal fired to get a list of factories to try to autoplug */
GValueArray *(*autoplug_factories) (GstElement * element, GstPad * pad,
GstCaps * caps);
/* signal fired to sort the factories */
GValueArray *(*autoplug_sort) (GstElement * element, GstPad * pad,
GstCaps * caps, GValueArray * factories);
/* signal fired to select from the proposed list of factories */
GstAutoplugSelectResult (*autoplug_select) (GstElement * element,
GstPad * pad, GstCaps * caps, GstElementFactory * factory);
/* signal fired when a autoplugged element that is not linked downstream
* or exposed wants to query something */
gboolean (*autoplug_query) (GstElement * element, GstPad * pad,
GstQuery * query);
/* fired when the last group is drained */
void (*drained) (GstElement * element);
};
/* signals */
enum
{
SIGNAL_UNKNOWN_TYPE,
SIGNAL_AUTOPLUG_CONTINUE,
SIGNAL_AUTOPLUG_FACTORIES,
SIGNAL_AUTOPLUG_SELECT,
SIGNAL_AUTOPLUG_SORT,
SIGNAL_AUTOPLUG_QUERY,
SIGNAL_DRAINED,
LAST_SIGNAL
};
#define DEFAULT_SUBTITLE_ENCODING NULL
#define DEFAULT_USE_BUFFERING FALSE
#define DEFAULT_LOW_PERCENT 10
#define DEFAULT_HIGH_PERCENT 99
/* by default we use the automatic values above */
#define DEFAULT_EXPOSE_ALL_STREAMS TRUE
#define DEFAULT_CONNECTION_SPEED 0
/* Properties */
enum
{
PROP_0,
PROP_SUBTITLE_ENCODING,
PROP_SINK_CAPS,
PROP_EXPOSE_ALL_STREAMS,
PROP_CONNECTION_SPEED
};
static GstBinClass *parent_class;
static guint gst_parse_bin_signals[LAST_SIGNAL] = { 0 };
static void do_async_start (GstParseBin * parsebin);
static void do_async_done (GstParseBin * parsebin);
static void type_found (GstElement * typefind, guint probability,
GstCaps * caps, GstParseBin * parse_bin);
static gboolean gst_parse_bin_autoplug_continue (GstElement * element,
GstPad * pad, GstCaps * caps);
static GValueArray *gst_parse_bin_autoplug_factories (GstElement *
element, GstPad * pad, GstCaps * caps);
static GValueArray *gst_parse_bin_autoplug_sort (GstElement * element,
GstPad * pad, GstCaps * caps, GValueArray * factories);
static GstAutoplugSelectResult gst_parse_bin_autoplug_select (GstElement *
element, GstPad * pad, GstCaps * caps, GstElementFactory * factory);
static gboolean gst_parse_bin_autoplug_query (GstElement * element,
GstPad * pad, GstQuery * query);
static void gst_parse_bin_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_parse_bin_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void caps_notify_cb (GstPad * pad, GParamSpec * unused,
GstParseChain * chain);
static GstStateChangeReturn gst_parse_bin_change_state (GstElement * element,
GstStateChange transition);
static void gst_parse_bin_handle_message (GstBin * bin, GstMessage * message);
static void gst_parse_pad_update_caps (GstParsePad * parsepad, GstCaps * caps);
static void gst_parse_pad_update_tags (GstParsePad * parsepad,
GstTagList * tags);
static GstEvent *gst_parse_pad_stream_start_event (GstParsePad * parsepad,
GstEvent * event);
static void gst_parse_pad_update_stream_collection (GstParsePad * parsepad,
GstStreamCollection * collection);
static GstCaps *get_pad_caps (GstPad * pad);
#define EXPOSE_LOCK(parsebin) G_STMT_START { \
GST_LOG_OBJECT (parsebin, \
"expose locking from thread %p", \
g_thread_self ()); \
g_mutex_lock (&GST_PARSE_BIN_CAST(parsebin)->expose_lock); \
GST_LOG_OBJECT (parsebin, \
"expose locked from thread %p", \
g_thread_self ()); \
} G_STMT_END
#define EXPOSE_UNLOCK(parsebin) G_STMT_START { \
GST_LOG_OBJECT (parsebin, \
"expose unlocking from thread %p", \
g_thread_self ()); \
g_mutex_unlock (&GST_PARSE_BIN_CAST(parsebin)->expose_lock); \
} G_STMT_END
#define DYN_LOCK(parsebin) G_STMT_START { \
GST_LOG_OBJECT (parsebin, \
"dynlocking from thread %p", \
g_thread_self ()); \
g_mutex_lock (&GST_PARSE_BIN_CAST(parsebin)->dyn_lock); \
GST_LOG_OBJECT (parsebin, \
"dynlocked from thread %p", \
g_thread_self ()); \
} G_STMT_END
#define DYN_UNLOCK(parsebin) G_STMT_START { \
GST_LOG_OBJECT (parsebin, \
"dynunlocking from thread %p", \
g_thread_self ()); \
g_mutex_unlock (&GST_PARSE_BIN_CAST(parsebin)->dyn_lock); \
} G_STMT_END
#define SUBTITLE_LOCK(parsebin) G_STMT_START { \
GST_LOG_OBJECT (parsebin, \
"subtitle locking from thread %p", \
g_thread_self ()); \
g_mutex_lock (&GST_PARSE_BIN_CAST(parsebin)->subtitle_lock); \
GST_LOG_OBJECT (parsebin, \
"subtitle lock from thread %p", \
g_thread_self ()); \
} G_STMT_END
#define SUBTITLE_UNLOCK(parsebin) G_STMT_START { \
GST_LOG_OBJECT (parsebin, \
"subtitle unlocking from thread %p", \
g_thread_self ()); \
g_mutex_unlock (&GST_PARSE_BIN_CAST(parsebin)->subtitle_lock); \
} G_STMT_END
struct _GstPendingPad
{
GstPad *pad;
GstParseChain *chain;
gulong event_probe_id;
gulong notify_caps_id;
};
struct _GstParseElement
{
GstElement *element;
GstElement *capsfilter; /* Optional capsfilter for Parser/Convert */
gulong pad_added_id;
gulong pad_removed_id;
gulong no_more_pads_id;
};
/* GstParseGroup
*
* Streams belonging to the same group/chain of a media file
*
* When changing something here lock the parent chain!
*/
struct _GstParseGroup
{
GstParseBin *parsebin;
GstParseChain *parent;
gboolean no_more_pads; /* TRUE if the demuxer signaled no-more-pads */
gboolean drained; /* TRUE if the all children are drained */
GList *children; /* List of GstParseChains in this group */
};
struct _GstParseChain
{
GstParseGroup *parent;
GstParseBin *parsebin;
GMutex lock; /* Protects this chain and its groups */
GstPad *pad; /* srcpad that caused creation of this chain */
GstCaps *start_caps; /* The initial caps of this chain */
gboolean drained; /* TRUE if the all children are drained */
gboolean demuxer; /* TRUE if elements->data is a demuxer */
gboolean parsed; /* TRUE if any elements are a parser */
GList *elements; /* All elements in this group, first
is the latest and most downstream element */
/* Note: there are only groups if the last element of this chain
* is a demuxer, otherwise the chain will end with an endpad.
* The other way around this means, that endpad only exists if this
* chain doesn't end with a demuxer! */
GstParseGroup *active_group; /* Currently active group */
GList *next_groups; /* head is newest group, tail is next group.
a new group will be created only if the head
group had no-more-pads. If it's only exposed
all new pads will be ignored! */
GList *pending_pads; /* Pads that have no fixed caps yet */
GstParsePad *current_pad; /* Current ending pad of the chain that can't
* be exposed yet but would be the same as endpad
* once it can be exposed */
GstParsePad *endpad; /* Pad of this chain that could be exposed */
gboolean deadend; /* This chain is incomplete and can't be completed,
e.g. no suitable parser could be found
e.g. stream got EOS without buffers
*/
gchar *deadend_details;
GstCaps *endcaps; /* Caps that were used when linking to the endpad
or that resulted in the deadend
*/
/* FIXME: This should be done directly via a thread! */
GList *old_groups; /* Groups that should be freed later */
};
static void gst_parse_chain_free (GstParseChain * chain);
static GstParseChain *gst_parse_chain_new (GstParseBin * parsebin,
GstParseGroup * group, GstPad * pad, GstCaps * start_caps);
static void gst_parse_group_hide (GstParseGroup * group);
static void gst_parse_group_free (GstParseGroup * group);
static GstParseGroup *gst_parse_group_new (GstParseBin * parsebin,
GstParseChain * chain);
static gboolean gst_parse_chain_is_complete (GstParseChain * chain);
static gboolean gst_parse_chain_expose (GstParseChain * chain,
GList ** endpads, gboolean * missing_plugin,
GString * missing_plugin_details, gboolean * last_group,
gboolean * uncollected_streams);
static void build_fallback_collection (GstParseChain * chain,
GstStreamCollection * collection);
static gboolean gst_parse_chain_is_drained (GstParseChain * chain);
static gboolean gst_parse_group_is_complete (GstParseGroup * group);
static gboolean gst_parse_group_is_drained (GstParseGroup * group);
static gboolean gst_parse_bin_expose (GstParseBin * parsebin);
#define CHAIN_MUTEX_LOCK(chain) G_STMT_START { \
GST_LOG_OBJECT (chain->parsebin, \
"locking chain %p from thread %p", \
chain, g_thread_self ()); \
g_mutex_lock (&chain->lock); \
GST_LOG_OBJECT (chain->parsebin, \
"locked chain %p from thread %p", \
chain, g_thread_self ()); \
} G_STMT_END
#define CHAIN_MUTEX_UNLOCK(chain) G_STMT_START { \
GST_LOG_OBJECT (chain->parsebin, \
"unlocking chain %p from thread %p", \
chain, g_thread_self ()); \
g_mutex_unlock (&chain->lock); \
} G_STMT_END
/* GstParsePad
*
* GstPad private used for source pads of chains
*/
struct _GstParsePad
{
GstGhostPad parent;
GstParseBin *parsebin;
GstParseChain *chain;
gboolean blocked; /* the *target* pad is blocked */
gboolean exposed; /* the pad is exposed */
gboolean drained; /* an EOS has been seen on the pad */
gulong block_id;
gboolean in_a_fallback_collection;
GstStreamCollection *active_collection;
GstStream *active_stream;
};
GType gst_parse_pad_get_type (void);
G_DEFINE_TYPE (GstParsePad, gst_parse_pad, GST_TYPE_GHOST_PAD);
#define GST_TYPE_PARSE_PAD (gst_parse_pad_get_type ())
#define GST_PARSE_PAD(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_PARSE_PAD,GstParsePad))
static GstParsePad *gst_parse_pad_new (GstParseBin * parsebin,
GstParseChain * chain);
static void gst_parse_pad_activate (GstParsePad * parsepad,
GstParseChain * chain);
static void gst_parse_pad_unblock (GstParsePad * parsepad);
static void gst_parse_pad_set_blocked (GstParsePad * parsepad,
gboolean blocked);
static gboolean gst_parse_pad_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static GstPadProbeReturn
gst_parse_pad_event (GstPad * pad, GstPadProbeInfo * info, gpointer user_data);
static void gst_pending_pad_free (GstPendingPad * ppad);
static GstPadProbeReturn pad_event_cb (GstPad * pad, GstPadProbeInfo * info,
gpointer data);
/********************************
* Standard GObject boilerplate *
********************************/
static void gst_parse_bin_class_init (GstParseBinClass * klass);
static void gst_parse_bin_init (GstParseBin * parse_bin);
static void gst_parse_bin_dispose (GObject * object);
static void gst_parse_bin_finalize (GObject * object);
static GType
gst_parse_bin_get_type (void)
{
static GType gst_parse_bin_type = 0;
if (!gst_parse_bin_type) {
static const GTypeInfo gst_parse_bin_info = {
sizeof (GstParseBinClass),
NULL,
NULL,
(GClassInitFunc) gst_parse_bin_class_init,
NULL,
NULL,
sizeof (GstParseBin),
0,
(GInstanceInitFunc) gst_parse_bin_init,
NULL
};
gst_parse_bin_type =
g_type_register_static (GST_TYPE_BIN, "GstParseBin",
&gst_parse_bin_info, 0);
}
return gst_parse_bin_type;
}
static gboolean
_gst_boolean_accumulator (GSignalInvocationHint * ihint,
GValue * return_accu, const GValue * handler_return, gpointer dummy)
{
gboolean myboolean;
myboolean = g_value_get_boolean (handler_return);
if (!(ihint->run_type & G_SIGNAL_RUN_CLEANUP))
g_value_set_boolean (return_accu, myboolean);
/* stop emission if FALSE */
return myboolean;
}
static gboolean
_gst_boolean_or_accumulator (GSignalInvocationHint * ihint,
GValue * return_accu, const GValue * handler_return, gpointer dummy)
{
gboolean myboolean;
gboolean retboolean;
myboolean = g_value_get_boolean (handler_return);
retboolean = g_value_get_boolean (return_accu);
if (!(ihint->run_type & G_SIGNAL_RUN_CLEANUP))
g_value_set_boolean (return_accu, myboolean || retboolean);
return TRUE;
}
/* we collect the first result */
static gboolean
_gst_array_accumulator (GSignalInvocationHint * ihint,
GValue * return_accu, const GValue * handler_return, gpointer dummy)
{
gpointer array;
array = g_value_get_boxed (handler_return);
if (!(ihint->run_type & G_SIGNAL_RUN_CLEANUP))
g_value_set_boxed (return_accu, array);
return FALSE;
}
static gboolean
_gst_select_accumulator (GSignalInvocationHint * ihint,
GValue * return_accu, const GValue * handler_return, gpointer dummy)
{
GstAutoplugSelectResult res;
res = g_value_get_enum (handler_return);
if (!(ihint->run_type & G_SIGNAL_RUN_CLEANUP))
g_value_set_enum (return_accu, res);
/* Call the next handler in the chain (if any) when the current callback
* returns TRY. This makes it possible to register separate autoplug-select
* handlers that implement different TRY/EXPOSE/SKIP strategies.
*/
if (res == GST_AUTOPLUG_SELECT_TRY)
return TRUE;
return FALSE;
}
static gboolean
_gst_array_hasvalue_accumulator (GSignalInvocationHint * ihint,
GValue * return_accu, const GValue * handler_return, gpointer dummy)
{
gpointer array;
array = g_value_get_boxed (handler_return);
if (!(ihint->run_type & G_SIGNAL_RUN_CLEANUP))
g_value_set_boxed (return_accu, array);
if (array != NULL)
return FALSE;
return TRUE;
}
static void
gst_parse_bin_class_init (GstParseBinClass * klass)
{
GObjectClass *gobject_klass;
GstElementClass *gstelement_klass;
GstBinClass *gstbin_klass;
gobject_klass = (GObjectClass *) klass;
gstelement_klass = (GstElementClass *) klass;
gstbin_klass = (GstBinClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_klass->dispose = gst_parse_bin_dispose;
gobject_klass->finalize = gst_parse_bin_finalize;
gobject_klass->set_property = gst_parse_bin_set_property;
gobject_klass->get_property = gst_parse_bin_get_property;
/**
* GstParseBin::unknown-type:
* @bin: The ParseBin.
* @pad: The new pad containing caps that cannot be resolved to a 'final'
* stream type.
* @caps: The #GstCaps of the pad that cannot be resolved.
*
* This signal is emitted when a pad for which there is no further possible
* parsing is added to the ParseBin.
*/
gst_parse_bin_signals[SIGNAL_UNKNOWN_TYPE] =
g_signal_new ("unknown-type", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstParseBinClass, unknown_type),
NULL, NULL, g_cclosure_marshal_generic, G_TYPE_NONE, 2,
GST_TYPE_PAD, GST_TYPE_CAPS);
/**
* GstParseBin::autoplug-continue:
* @bin: The ParseBin.
* @pad: The #GstPad.
* @caps: The #GstCaps found.
*
* This signal is emitted whenever ParseBin finds a new stream. It is
* emitted before looking for any elements that can handle that stream.
*
* <note>
* Invocation of signal handlers stops after the first signal handler
* returns #FALSE. Signal handlers are invoked in the order they were
* connected in.
* </note>
*
* Returns: #TRUE if you wish ParseBin to look for elements that can
* handle the given @caps. If #FALSE, those caps will be considered as
* final and the pad will be exposed as such (see 'pad-added' signal of
* #GstElement).
*/
gst_parse_bin_signals[SIGNAL_AUTOPLUG_CONTINUE] =
g_signal_new ("autoplug-continue", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstParseBinClass, autoplug_continue),
_gst_boolean_accumulator, NULL, g_cclosure_marshal_generic,
G_TYPE_BOOLEAN, 2, GST_TYPE_PAD, GST_TYPE_CAPS);
/**
* GstParseBin::autoplug-factories:
* @bin: The ParseBin.
* @pad: The #GstPad.
* @caps: The #GstCaps found.
*
* This function is emited when an array of possible factories for @caps on
* @pad is needed. ParseBin will by default return an array with all
* compatible factories, sorted by rank.
*
* If this function returns NULL, @pad will be exposed as a final caps.
*
* If this function returns an empty array, the pad will be considered as
* having an unhandled type media type.
*
* <note>
* Only the signal handler that is connected first will ever by invoked.
* Don't connect signal handlers with the #G_CONNECT_AFTER flag to this
* signal, they will never be invoked!
* </note>
*
* Returns: a #GValueArray* with a list of factories to try. The factories are
* by default tried in the returned order or based on the index returned by
* "autoplug-select".
*/
gst_parse_bin_signals[SIGNAL_AUTOPLUG_FACTORIES] =
g_signal_new ("autoplug-factories", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstParseBinClass,
autoplug_factories), _gst_array_accumulator, NULL,
g_cclosure_marshal_generic, G_TYPE_VALUE_ARRAY, 2,
GST_TYPE_PAD, GST_TYPE_CAPS);
/**
* GstParseBin::autoplug-sort:
* @bin: The ParseBin.
* @pad: The #GstPad.
* @caps: The #GstCaps.
* @factories: A #GValueArray of possible #GstElementFactory to use.
*
* Once ParseBin has found the possible #GstElementFactory objects to try
* for @caps on @pad, this signal is emited. The purpose of the signal is for
* the application to perform additional sorting or filtering on the element
* factory array.
*
* The callee should copy and modify @factories or return #NULL if the
* order should not change.
*
* <note>
* Invocation of signal handlers stops after one signal handler has
* returned something else than #NULL. Signal handlers are invoked in
* the order they were connected in.
* Don't connect signal handlers with the #G_CONNECT_AFTER flag to this
* signal, they will never be invoked!
* </note>
*
* Returns: A new sorted array of #GstElementFactory objects.
*/
gst_parse_bin_signals[SIGNAL_AUTOPLUG_SORT] =
g_signal_new ("autoplug-sort", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstParseBinClass, autoplug_sort),
_gst_array_hasvalue_accumulator, NULL,
g_cclosure_marshal_generic, G_TYPE_VALUE_ARRAY, 3, GST_TYPE_PAD,
GST_TYPE_CAPS, G_TYPE_VALUE_ARRAY | G_SIGNAL_TYPE_STATIC_SCOPE);
/**
* GstParseBin::autoplug-select:
* @bin: The ParseBin.
* @pad: The #GstPad.
* @caps: The #GstCaps.
* @factory: A #GstElementFactory to use.
*
* This signal is emitted once ParseBin has found all the possible
* #GstElementFactory that can be used to handle the given @caps. For each of
* those factories, this signal is emitted.
*
* The signal handler should return a #GST_TYPE_AUTOPLUG_SELECT_RESULT enum
* value indicating what ParseBin should do next.
*
* A value of #GST_AUTOPLUG_SELECT_TRY will try to autoplug an element from
* @factory.
*
* A value of #GST_AUTOPLUG_SELECT_EXPOSE will expose @pad without plugging
* any element to it.
*
* A value of #GST_AUTOPLUG_SELECT_SKIP will skip @factory and move to the
* next factory.
*
* <note>
* The signal handler will not be invoked if any of the previously
* registered signal handlers (if any) return a value other than
* GST_AUTOPLUG_SELECT_TRY. Which also means that if you return
* GST_AUTOPLUG_SELECT_TRY from one signal handler, handlers that get
* registered next (again, if any) can override that decision.
* </note>
*
* Returns: a #GST_TYPE_AUTOPLUG_SELECT_RESULT that indicates the required
* operation. the default handler will always return
* #GST_AUTOPLUG_SELECT_TRY.
*/
gst_parse_bin_signals[SIGNAL_AUTOPLUG_SELECT] =
g_signal_new ("autoplug-select", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstParseBinClass, autoplug_select),
_gst_select_accumulator, NULL,
g_cclosure_marshal_generic,
GST_TYPE_AUTOPLUG_SELECT_RESULT, 3, GST_TYPE_PAD, GST_TYPE_CAPS,
GST_TYPE_ELEMENT_FACTORY);
/**
* GstParseBin::autoplug-query:
* @bin: The ParseBin.
* @child: The child element doing the query
* @pad: The #GstPad.
* @element: The #GstElement.
* @query: The #GstQuery.
*
* This signal is emitted whenever an autoplugged element that is
* not linked downstream yet and not exposed does a query. It can
* be used to tell the element about the downstream supported caps
* for example.
*
* Returns: #TRUE if the query was handled, #FALSE otherwise.
*/
gst_parse_bin_signals[SIGNAL_AUTOPLUG_QUERY] =
g_signal_new ("autoplug-query", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstParseBinClass, autoplug_query),
_gst_boolean_or_accumulator, NULL, g_cclosure_marshal_generic,
G_TYPE_BOOLEAN, 3, GST_TYPE_PAD, GST_TYPE_ELEMENT,
GST_TYPE_QUERY | G_SIGNAL_TYPE_STATIC_SCOPE);
/**
* GstParseBin::drained
* @bin: The ParseBin
*
* This signal is emitted once ParseBin has finished parsing all the data.
*/
gst_parse_bin_signals[SIGNAL_DRAINED] =
g_signal_new ("drained", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstParseBinClass, drained),
NULL, NULL, g_cclosure_marshal_generic, G_TYPE_NONE, 0, G_TYPE_NONE);
g_object_class_install_property (gobject_klass, PROP_SUBTITLE_ENCODING,
g_param_spec_string ("subtitle-encoding", "subtitle encoding",
"Encoding to assume if input subtitles are not in UTF-8 encoding. "
"If not set, the GST_SUBTITLE_ENCODING environment variable will "
"be checked for an encoding to use. If that is not set either, "
"ISO-8859-15 will be assumed.", NULL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_klass, PROP_SINK_CAPS,
g_param_spec_boxed ("sink-caps", "Sink Caps",
"The caps of the input data. (NULL = use typefind element)",
GST_TYPE_CAPS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstParseBin::expose-all-streams
*
* Expose streams of unknown type.
*
* If set to %FALSE, then only the streams that can be parsed to the final
* caps (see 'caps' property) will have a pad exposed. Streams that do not
* match those caps but could have been parsed will not have parser plugged
* in internally and will not have a pad exposed.
*/
g_object_class_install_property (gobject_klass, PROP_EXPOSE_ALL_STREAMS,
g_param_spec_boolean ("expose-all-streams", "Expose All Streams",
"Expose all streams, including those of unknown type or that don't match the 'caps' property",
DEFAULT_EXPOSE_ALL_STREAMS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
/**
* GstParseBin2::connection-speed
*
* Network connection speed in kbps (0 = unknownw)
*/
g_object_class_install_property (gobject_klass, PROP_CONNECTION_SPEED,
g_param_spec_uint64 ("connection-speed", "Connection Speed",
"Network connection speed in kbps (0 = unknown)",
0, G_MAXUINT64 / 1000, DEFAULT_CONNECTION_SPEED,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
klass->autoplug_continue =
GST_DEBUG_FUNCPTR (gst_parse_bin_autoplug_continue);
klass->autoplug_factories =
GST_DEBUG_FUNCPTR (gst_parse_bin_autoplug_factories);
klass->autoplug_sort = GST_DEBUG_FUNCPTR (gst_parse_bin_autoplug_sort);
klass->autoplug_select = GST_DEBUG_FUNCPTR (gst_parse_bin_autoplug_select);
klass->autoplug_query = GST_DEBUG_FUNCPTR (gst_parse_bin_autoplug_query);
gst_element_class_add_pad_template (gstelement_klass,
gst_static_pad_template_get (&parse_bin_sink_template));
gst_element_class_add_pad_template (gstelement_klass,
gst_static_pad_template_get (&parse_bin_src_template));
gst_element_class_set_static_metadata (gstelement_klass,
"Parse Bin", "Generic/Bin/Parser",
"Parse and de-multiplex to elementary stream",
"Jan Schmidt <jan@centricular.com>, "
"Edward Hervey <edward@centricular.com>");
gstelement_klass->change_state =
GST_DEBUG_FUNCPTR (gst_parse_bin_change_state);
gstbin_klass->handle_message =
GST_DEBUG_FUNCPTR (gst_parse_bin_handle_message);
g_type_class_ref (GST_TYPE_PARSE_PAD);
}
static void
gst_parse_bin_update_factories_list (GstParseBin * parsebin)
{
guint cookie;
cookie = gst_registry_get_feature_list_cookie (gst_registry_get ());
if (!parsebin->factories || parsebin->factories_cookie != cookie) {
if (parsebin->factories)
gst_plugin_feature_list_free (parsebin->factories);
parsebin->factories =
gst_element_factory_list_get_elements
(GST_ELEMENT_FACTORY_TYPE_DECODABLE, GST_RANK_MARGINAL);
parsebin->factories =
g_list_sort (parsebin->factories,
gst_playback_utils_compare_factories_func);
parsebin->factories_cookie = cookie;
}
}
static void
gst_parse_bin_init (GstParseBin * parse_bin)
{
/* first filter out the interesting element factories */
g_mutex_init (&parse_bin->factories_lock);
/* we create the typefind element only once */
parse_bin->typefind = gst_element_factory_make ("typefind", "typefind");
if (!parse_bin->typefind) {
g_warning ("can't find typefind element, ParseBin will not work");
} else {
GstPad *pad;
GstPad *gpad;
GstPadTemplate *pad_tmpl;
/* add the typefind element */
if (!gst_bin_add (GST_BIN (parse_bin), parse_bin->typefind)) {
g_warning ("Could not add typefind element, ParseBin will not work");
gst_object_unref (parse_bin->typefind);
parse_bin->typefind = NULL;
}
/* get the sinkpad */
pad = gst_element_get_static_pad (parse_bin->typefind, "sink");
/* get the pad template */
pad_tmpl = gst_static_pad_template_get (&parse_bin_sink_template);
/* ghost the sink pad to ourself */
gpad = gst_ghost_pad_new_from_template ("sink", pad, pad_tmpl);
gst_pad_set_active (gpad, TRUE);
gst_element_add_pad (GST_ELEMENT (parse_bin), gpad);
gst_object_unref (pad_tmpl);
gst_object_unref (pad);
}
g_mutex_init (&parse_bin->expose_lock);
parse_bin->parse_chain = NULL;
g_mutex_init (&parse_bin->dyn_lock);
parse_bin->shutdown = FALSE;
parse_bin->blocked_pads = NULL;
g_mutex_init (&parse_bin->subtitle_lock);
parse_bin->encoding = g_strdup (DEFAULT_SUBTITLE_ENCODING);
parse_bin->expose_allstreams = DEFAULT_EXPOSE_ALL_STREAMS;
parse_bin->connection_speed = DEFAULT_CONNECTION_SPEED;
GST_OBJECT_FLAG_SET (parse_bin, GST_BIN_FLAG_STREAMS_AWARE);
}
static void
gst_parse_bin_dispose (GObject * object)
{
GstParseBin *parse_bin;
parse_bin = GST_PARSE_BIN (object);
if (parse_bin->factories)
gst_plugin_feature_list_free (parse_bin->factories);
parse_bin->factories = NULL;
if (parse_bin->parse_chain)
gst_parse_chain_free (parse_bin->parse_chain);
parse_bin->parse_chain = NULL;
g_free (parse_bin->encoding);
parse_bin->encoding = NULL;
g_list_free (parse_bin->subtitles);
parse_bin->subtitles = NULL;
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_parse_bin_finalize (GObject * object)
{
GstParseBin *parse_bin;
parse_bin = GST_PARSE_BIN (object);
g_mutex_clear (&parse_bin->expose_lock);
g_mutex_clear (&parse_bin->dyn_lock);
g_mutex_clear (&parse_bin->subtitle_lock);
g_mutex_clear (&parse_bin->factories_lock);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_parse_bin_set_sink_caps (GstParseBin * parsebin, GstCaps * caps)
{
GST_DEBUG_OBJECT (parsebin, "Setting new caps: %" GST_PTR_FORMAT, caps);
g_object_set (parsebin->typefind, "force-caps", caps, NULL);
}
static GstCaps *
gst_parse_bin_get_sink_caps (GstParseBin * parsebin)
{
GstCaps *caps;
GST_DEBUG_OBJECT (parsebin, "Getting currently set caps");
g_object_get (parsebin->typefind, "force-caps", &caps, NULL);
return caps;
}
static void
gst_parse_bin_set_subs_encoding (GstParseBin * parsebin, const gchar * encoding)
{
GList *walk;
GST_DEBUG_OBJECT (parsebin, "Setting new encoding: %s",
GST_STR_NULL (encoding));
SUBTITLE_LOCK (parsebin);
g_free (parsebin->encoding);
parsebin->encoding = g_strdup (encoding);
/* set the subtitle encoding on all added elements */
for (walk = parsebin->subtitles; walk; walk = g_list_next (walk)) {
g_object_set (G_OBJECT (walk->data), "subtitle-encoding",
parsebin->encoding, NULL);
}
SUBTITLE_UNLOCK (parsebin);
}
static gchar *
gst_parse_bin_get_subs_encoding (GstParseBin * parsebin)
{
gchar *encoding;
GST_DEBUG_OBJECT (parsebin, "Getting currently set encoding");
SUBTITLE_LOCK (parsebin);
encoding = g_strdup (parsebin->encoding);
SUBTITLE_UNLOCK (parsebin);
return encoding;
}
static void
gst_parse_bin_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstParseBin *parsebin;
parsebin = GST_PARSE_BIN (object);
switch (prop_id) {
case PROP_SUBTITLE_ENCODING:
gst_parse_bin_set_subs_encoding (parsebin, g_value_get_string (value));
break;
case PROP_SINK_CAPS:
gst_parse_bin_set_sink_caps (parsebin, g_value_get_boxed (value));
break;
case PROP_EXPOSE_ALL_STREAMS:
parsebin->expose_allstreams = g_value_get_boolean (value);
break;
case PROP_CONNECTION_SPEED:
GST_OBJECT_LOCK (parsebin);
parsebin->connection_speed = g_value_get_uint64 (value) * 1000;
GST_OBJECT_UNLOCK (parsebin);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_parse_bin_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstParseBin *parsebin;
parsebin = GST_PARSE_BIN (object);
switch (prop_id) {
case PROP_SUBTITLE_ENCODING:
g_value_take_string (value, gst_parse_bin_get_subs_encoding (parsebin));
break;
case PROP_SINK_CAPS:
g_value_take_boxed (value, gst_parse_bin_get_sink_caps (parsebin));
break;
case PROP_EXPOSE_ALL_STREAMS:
g_value_set_boolean (value, parsebin->expose_allstreams);
break;
case PROP_CONNECTION_SPEED:
GST_OBJECT_LOCK (parsebin);
g_value_set_uint64 (value, parsebin->connection_speed / 1000);
GST_OBJECT_UNLOCK (parsebin);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/*****
* Default autoplug signal handlers
*****/
static gboolean
gst_parse_bin_autoplug_continue (GstElement * element, GstPad * pad,
GstCaps * caps)
{
GST_DEBUG_OBJECT (element, "autoplug-continue returns TRUE");
/* by default we always continue */
return TRUE;
}
static GValueArray *
gst_parse_bin_autoplug_factories (GstElement * element, GstPad * pad,
GstCaps * caps)
{
GList *list, *tmp;
GValueArray *result;
GstParseBin *parsebin = GST_PARSE_BIN_CAST (element);
GST_DEBUG_OBJECT (element, "finding factories");
/* return all compatible factories for caps */
g_mutex_lock (&parsebin->factories_lock);
gst_parse_bin_update_factories_list (parsebin);
list =
gst_element_factory_list_filter (parsebin->factories, caps, GST_PAD_SINK,
gst_caps_is_fixed (caps));
g_mutex_unlock (&parsebin->factories_lock);
result = g_value_array_new (g_list_length (list));
for (tmp = list; tmp; tmp = tmp->next) {
GstElementFactory *factory = GST_ELEMENT_FACTORY_CAST (tmp->data);
GValue val = { 0, };
g_value_init (&val, G_TYPE_OBJECT);
g_value_set_object (&val, factory);
g_value_array_append (result, &val);
g_value_unset (&val);
}
gst_plugin_feature_list_free (list);
GST_DEBUG_OBJECT (element, "autoplug-factories returns %p", result);
return result;
}
static GValueArray *
gst_parse_bin_autoplug_sort (GstElement * element, GstPad * pad,
GstCaps * caps, GValueArray * factories)
{
return NULL;
}
static GstAutoplugSelectResult
gst_parse_bin_autoplug_select (GstElement * element, GstPad * pad,
GstCaps * caps, GstElementFactory * factory)
{
/* Try factory. */
return GST_AUTOPLUG_SELECT_TRY;
}
static gboolean
gst_parse_bin_autoplug_query (GstElement * element, GstPad * pad,
GstQuery * query)
{
/* No query handled here */
return FALSE;
}
/********
* Discovery methods
*****/
static gboolean is_demuxer_element (GstElement * srcelement);
static gboolean connect_pad (GstParseBin * parsebin, GstElement * src,
GstParsePad * parsepad, GstPad * pad, GstCaps * caps,
GValueArray * factories, GstParseChain * chain, gchar ** deadend_details);
static GList *connect_element (GstParseBin * parsebin, GstParseElement * pelem,
GstParseChain * chain);
static void expose_pad (GstParseBin * parsebin, GstElement * src,
GstParsePad * parsepad, GstPad * pad, GstCaps * caps,
GstParseChain * chain);
static void pad_added_cb (GstElement * element, GstPad * pad,
GstParseChain * chain);
static void pad_removed_cb (GstElement * element, GstPad * pad,
GstParseChain * chain);
static void no_more_pads_cb (GstElement * element, GstParseChain * chain);
static GstParseGroup *gst_parse_chain_get_current_group (GstParseChain * chain);
static gboolean
clear_sticky_events (GstPad * pad, GstEvent ** event, gpointer user_data)
{
GST_DEBUG_OBJECT (pad, "clearing sticky event %" GST_PTR_FORMAT, *event);
gst_event_unref (*event);
*event = NULL;
return TRUE;
}
static gboolean
copy_sticky_events (GstPad * pad, GstEvent ** eventptr, gpointer user_data)
{
GstParsePad *ppad = GST_PARSE_PAD (user_data);
GstEvent *event = gst_event_ref (*eventptr);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:{
GstCaps *caps = NULL;
gst_event_parse_caps (event, &caps);
gst_parse_pad_update_caps (ppad, caps);
break;
}
case GST_EVENT_STREAM_START:{
event = gst_parse_pad_stream_start_event (ppad, event);
break;
}
case GST_EVENT_STREAM_COLLECTION:{
GstStreamCollection *collection = NULL;
gst_event_parse_stream_collection (event, &collection);
gst_parse_pad_update_stream_collection (ppad, collection);
break;
}
default:
break;
}
GST_DEBUG_OBJECT (ppad, "store sticky event %" GST_PTR_FORMAT, event);
gst_pad_store_sticky_event (GST_PAD_CAST (ppad), event);
gst_event_unref (event);
return TRUE;
}
static void
parse_pad_set_target (GstParsePad * parsepad, GstPad * target)
{
GstPad *old_target = gst_ghost_pad_get_target (GST_GHOST_PAD_CAST (parsepad));
if (old_target)
gst_object_unref (old_target);
if (old_target == target)
return;
gst_pad_sticky_events_foreach (GST_PAD_CAST (parsepad),
clear_sticky_events, NULL);
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (parsepad), target);
if (target == NULL) {
GST_LOG_OBJECT (parsepad->parsebin, "Setting pad %" GST_PTR_FORMAT
" target to NULL", parsepad);
} else {
GST_LOG_OBJECT (parsepad->parsebin, "Setting pad %" GST_PTR_FORMAT
" target to %" GST_PTR_FORMAT, parsepad, target);
gst_pad_sticky_events_foreach (target, copy_sticky_events, parsepad);
}
}
/* called when a new pad is discovered. It will perform some basic actions
* before trying to link something to it.
*
* - Check the caps, don't do anything when there are no caps or when they have
* no good type.
* - signal AUTOPLUG_CONTINUE to check if we need to continue autoplugging this
* pad.
* - if the caps are non-fixed, setup a handler to continue autoplugging when
* the caps become fixed (connect to notify::caps).
* - get list of factories to autoplug.
* - continue autoplugging to one of the factories.
*/
static void
analyze_new_pad (GstParseBin * parsebin, GstElement * src, GstPad * pad,
GstCaps * caps, GstParseChain * chain)
{
gboolean apcontinue = TRUE;
GValueArray *factories = NULL, *result = NULL;
GstParsePad *parsepad;
GstElementFactory *factory;
const gchar *classification;
gboolean is_parser_converter = FALSE;
gboolean res;
gchar *deadend_details = NULL;
GST_DEBUG_OBJECT (parsebin, "Pad %s:%s caps:%" GST_PTR_FORMAT,
GST_DEBUG_PAD_NAME (pad), caps);
if (chain->elements
&& src != ((GstParseElement *) chain->elements->data)->element
&& src != ((GstParseElement *) chain->elements->data)->capsfilter) {
GST_ERROR_OBJECT (parsebin,
"New pad from not the last element in this chain");
return;
}
if (chain->demuxer) {
GstParseGroup *group;
GstParseChain *oldchain = chain;
GstParseElement *demux = (chain->elements ? chain->elements->data : NULL);
if (chain->current_pad)
gst_object_unref (chain->current_pad);
chain->current_pad = NULL;
/* we are adding a new pad for a demuxer (see is_demuxer_element(),
* start a new chain for it */
CHAIN_MUTEX_LOCK (oldchain);
group = gst_parse_chain_get_current_group (chain);
if (group && !g_list_find (group->children, chain)) {
chain = gst_parse_chain_new (parsebin, group, pad, caps);
group->children = g_list_prepend (group->children, chain);
}
CHAIN_MUTEX_UNLOCK (oldchain);
if (!group) {
GST_WARNING_OBJECT (parsebin, "No current group");
return;
}
/* If this is not a dynamic pad demuxer, we're no-more-pads
* already before anything else happens
*/
if (demux == NULL || !demux->no_more_pads_id)
group->no_more_pads = TRUE;
}
/* From here on we own a reference to the caps as
* we might create new caps below and would need
* to unref them later */
if (caps)
gst_caps_ref (caps);
if ((caps == NULL) || gst_caps_is_empty (caps))
goto unknown_type;
if (gst_caps_is_any (caps))
goto any_caps;
if (!chain->current_pad)
chain->current_pad = gst_parse_pad_new (parsebin, chain);
parsepad = gst_object_ref (chain->current_pad);
gst_pad_set_active (GST_PAD_CAST (parsepad), TRUE);
parse_pad_set_target (parsepad, pad);
/* 1. Emit 'autoplug-continue' the result will tell us if this pads needs
* further autoplugging. Only do this for fixed caps, for unfixed caps
* we will later come here again from the notify::caps handler. The
* problem with unfixed caps is that, we can't reliably tell if the output
* is e.g. accepted by a sink because only parts of the possible final
* caps might be accepted by the sink. */
if (gst_caps_is_fixed (caps))
g_signal_emit (G_OBJECT (parsebin),
gst_parse_bin_signals[SIGNAL_AUTOPLUG_CONTINUE], 0, parsepad, caps,
&apcontinue);
else
apcontinue = TRUE;
/* 1.a if autoplug-continue is FALSE or caps is a raw format, goto pad_is_final */
if (!apcontinue)
goto expose_pad;
/* 1.b For Parser/Converter that can output different stream formats
* we insert a capsfilter with the sorted caps of all possible next
* elements and continue with the capsfilter srcpad */
factory = gst_element_get_factory (src);
classification =
gst_element_factory_get_metadata (factory, GST_ELEMENT_METADATA_KLASS);
is_parser_converter = (strstr (classification, "Parser")
&& strstr (classification, "Converter"));
/* FIXME: We just need to be sure that the next element is not a parser */
/* 1.c when the caps are not fixed yet, we can't be sure what element to
* connect. We delay autoplugging until the caps are fixed */
if (!is_parser_converter && !gst_caps_is_fixed (caps)) {
goto non_fixed;
} else if (!is_parser_converter) {
gst_caps_unref (caps);
caps = gst_pad_get_current_caps (pad);
if (!caps) {
GST_DEBUG_OBJECT (parsebin,
"No final caps set yet, delaying autoplugging");
gst_object_unref (parsepad);
goto setup_caps_delay;
}
}
/* 1.d else get the factories and if there's no compatible factory goto
* unknown_type */
g_signal_emit (G_OBJECT (parsebin),
gst_parse_bin_signals[SIGNAL_AUTOPLUG_FACTORIES], 0, parsepad, caps,
&factories);
/* NULL means that we can expose the pad */
if (factories == NULL)
goto expose_pad;
/* if the array is empty, we have a type for which we have no parser */
if (factories->n_values == 0) {
/* if not we have a unhandled type with no compatible factories */
g_value_array_free (factories);
gst_object_unref (parsepad);
goto unknown_type;
}
/* 1.e sort some more. */
g_signal_emit (G_OBJECT (parsebin),
gst_parse_bin_signals[SIGNAL_AUTOPLUG_SORT], 0, parsepad, caps, factories,
&result);
if (result) {
g_value_array_free (factories);
factories = result;
}
/* 1.g now get the factory template caps and insert the capsfilter if this
* is a parser/converter
*/
if (is_parser_converter) {
GstCaps *filter_caps;
gint i;
GstPad *p;
GstParseElement *pelem;
g_assert (chain->elements != NULL);
pelem = (GstParseElement *) chain->elements->data;
filter_caps = gst_caps_new_empty ();
for (i = 0; i < factories->n_values; i++) {
GstElementFactory *factory =
g_value_get_object (g_value_array_get_nth (factories, i));
GstCaps *tcaps, *intersection;
const GList *tmps;
GST_DEBUG ("Trying factory %s",
gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory)));
if (gst_element_get_factory (src) == factory ||
gst_element_factory_list_is_type (factory,
GST_ELEMENT_FACTORY_TYPE_PARSER)) {
GST_DEBUG ("Skipping factory");
continue;
}
for (tmps = gst_element_factory_get_static_pad_templates (factory); tmps;
tmps = tmps->next) {
GstStaticPadTemplate *st = (GstStaticPadTemplate *) tmps->data;
if (st->direction != GST_PAD_SINK || st->presence != GST_PAD_ALWAYS)
continue;
tcaps = gst_static_pad_template_get_caps (st);
intersection =
gst_caps_intersect_full (tcaps, caps, GST_CAPS_INTERSECT_FIRST);
filter_caps = gst_caps_merge (filter_caps, intersection);
gst_caps_unref (tcaps);
}
}
/* Append the parser caps to prevent any not-negotiated errors */
filter_caps = gst_caps_merge (filter_caps, gst_caps_ref (caps));
pelem->capsfilter = gst_element_factory_make ("capsfilter", NULL);
g_object_set (G_OBJECT (pelem->capsfilter), "caps", filter_caps, NULL);
gst_caps_unref (filter_caps);
gst_element_set_state (pelem->capsfilter, GST_STATE_PAUSED);
gst_bin_add (GST_BIN_CAST (parsebin), gst_object_ref (pelem->capsfilter));
parse_pad_set_target (parsepad, NULL);
p = gst_element_get_static_pad (pelem->capsfilter, "sink");
gst_pad_link_full (pad, p, GST_PAD_LINK_CHECK_NOTHING);
gst_object_unref (p);
p = gst_element_get_static_pad (pelem->capsfilter, "src");
parse_pad_set_target (parsepad, p);
pad = p;
gst_caps_unref (caps);
caps = gst_pad_get_current_caps (pad);
if (!caps) {
GST_DEBUG_OBJECT (parsebin,
"No final caps set yet, delaying autoplugging");
gst_object_unref (parsepad);
g_value_array_free (factories);
goto setup_caps_delay;
}
}
/* 1.h else continue autoplugging something from the list. */
GST_LOG_OBJECT (pad, "Let's continue discovery on this pad");
res =
connect_pad (parsebin, src, parsepad, pad, caps, factories, chain,
&deadend_details);
/* Need to unref the capsfilter srcpad here if
* we inserted a capsfilter */
if (is_parser_converter)
gst_object_unref (pad);
gst_object_unref (parsepad);
g_value_array_free (factories);
if (!res)
goto unknown_type;
gst_caps_unref (caps);
return;
expose_pad:
{
GST_LOG_OBJECT (parsebin, "Pad is final. autoplug-continue:%d", apcontinue);
expose_pad (parsebin, src, parsepad, pad, caps, chain);
gst_object_unref (parsepad);
gst_caps_unref (caps);
return;
}
unknown_type:
{
GST_LOG_OBJECT (pad, "Unknown type, posting message and firing signal");
chain->deadend_details = deadend_details;
chain->deadend = TRUE;
chain->endcaps = caps;
gst_object_replace ((GstObject **) & chain->current_pad, NULL);
gst_element_post_message (GST_ELEMENT_CAST (parsebin),
gst_missing_decoder_message_new (GST_ELEMENT_CAST (parsebin), caps));
g_signal_emit (G_OBJECT (parsebin),
gst_parse_bin_signals[SIGNAL_UNKNOWN_TYPE], 0, pad, caps);
/* Try to expose anything */
EXPOSE_LOCK (parsebin);
if (parsebin->parse_chain) {
if (gst_parse_chain_is_complete (parsebin->parse_chain)) {
gst_parse_bin_expose (parsebin);
}
}
EXPOSE_UNLOCK (parsebin);
if (src == parsebin->typefind) {
if (!caps || gst_caps_is_empty (caps)) {
GST_ELEMENT_ERROR (parsebin, STREAM, TYPE_NOT_FOUND,
(_("Could not determine type of stream")), (NULL));
}
do_async_done (parsebin);
}
return;
}
#if 1
non_fixed:
{
GST_DEBUG_OBJECT (pad, "pad has non-fixed caps delay autoplugging");
gst_object_unref (parsepad);
goto setup_caps_delay;
}
#endif
any_caps:
{
GST_DEBUG_OBJECT (pad, "pad has ANY caps, delaying auto-plugging");
goto setup_caps_delay;
}
setup_caps_delay:
{
GstPendingPad *ppad;
/* connect to caps notification */
CHAIN_MUTEX_LOCK (chain);
GST_LOG_OBJECT (parsebin, "Chain %p has now %d dynamic pads", chain,
g_list_length (chain->pending_pads));
ppad = g_slice_new0 (GstPendingPad);
ppad->pad = gst_object_ref (pad);
ppad->chain = chain;
ppad->event_probe_id =
gst_pad_add_probe (pad, GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM,
pad_event_cb, ppad, NULL);
chain->pending_pads = g_list_prepend (chain->pending_pads, ppad);
ppad->notify_caps_id = g_signal_connect (pad, "notify::caps",
G_CALLBACK (caps_notify_cb), chain);
CHAIN_MUTEX_UNLOCK (chain);
/* If we're here because we have a Parser/Converter
* we have to unref the pad */
if (is_parser_converter)
gst_object_unref (pad);
if (caps)
gst_caps_unref (caps);
return;
}
}
static void
add_error_filter (GstParseBin * parsebin, GstElement * element)
{
GST_OBJECT_LOCK (parsebin);
parsebin->filtered = g_list_prepend (parsebin->filtered, element);
GST_OBJECT_UNLOCK (parsebin);
}
static void
remove_error_filter (GstParseBin * parsebin, GstElement * element,
GstMessage ** error)
{
GList *l;
GST_OBJECT_LOCK (parsebin);
parsebin->filtered = g_list_remove (parsebin->filtered, element);
if (error)
*error = NULL;
l = parsebin->filtered_errors;
while (l) {
GstMessage *msg = l->data;
if (GST_MESSAGE_SRC (msg) == GST_OBJECT_CAST (element)) {
/* Get the last error of this element, i.e. the earliest */
if (error)
gst_message_replace (error, msg);
gst_message_unref (msg);
l = parsebin->filtered_errors =
g_list_delete_link (parsebin->filtered_errors, l);
} else {
l = l->next;
}
}
GST_OBJECT_UNLOCK (parsebin);
}
typedef struct
{
gboolean ret;
GstPad *peer;
} SendStickyEventsData;
static gboolean
send_sticky_event (GstPad * pad, GstEvent ** event, gpointer user_data)
{
SendStickyEventsData *data = user_data;
gboolean ret;
ret = gst_pad_send_event (data->peer, gst_event_ref (*event));
if (!ret)
data->ret = FALSE;
return data->ret;
}
static gboolean
send_sticky_events (GstParseBin * parsebin, GstPad * pad)
{
SendStickyEventsData data;
data.ret = TRUE;
data.peer = gst_pad_get_peer (pad);
gst_pad_sticky_events_foreach (pad, send_sticky_event, &data);
gst_object_unref (data.peer);
return data.ret;
}
static gchar *
error_message_to_string (GstMessage * msg)
{
GError *err;
gchar *debug, *message, *full_message;
gst_message_parse_error (msg, &err, &debug);
message = gst_error_get_message (err->domain, err->code);
if (debug)
full_message = g_strdup_printf ("%s\n%s\n%s", message, err->message, debug);
else
full_message = g_strdup_printf ("%s\n%s", message, err->message);
g_free (message);
g_free (debug);
g_clear_error (&err);
return full_message;
}
/* We consider elements as "simple demuxer" when they are a demuxer
* with one and only one ALWAYS source pad.
*/
static gboolean
is_simple_demuxer_factory (GstElementFactory * factory)
{
if (strstr (gst_element_factory_get_metadata (factory,
GST_ELEMENT_METADATA_KLASS), "Demuxer")) {
const GList *tmp;
gint num_alway_srcpads = 0;
for (tmp = gst_element_factory_get_static_pad_templates (factory);
tmp; tmp = tmp->next) {
GstStaticPadTemplate *template = tmp->data;
if (template->direction == GST_PAD_SRC) {
if (template->presence == GST_PAD_ALWAYS) {
if (num_alway_srcpads >= 0)
num_alway_srcpads++;
} else {
num_alway_srcpads = -1;
}
}
}
if (num_alway_srcpads == 1)
return TRUE;
}
return FALSE;
}
/* connect_pad:
*
* Try to connect the given pad to an element created from one of the factories,
* and recursively.
*
* Note that parsepad is ghosting pad, and so pad is linked; be sure to unset parsepad's
* target before trying to link pad.
*
* Returns TRUE if an element was properly created and linked
*/
static gboolean
connect_pad (GstParseBin * parsebin, GstElement * src, GstParsePad * parsepad,
GstPad * pad, GstCaps * caps, GValueArray * factories,
GstParseChain * chain, gchar ** deadend_details)
{
gboolean res = FALSE;
GString *error_details = NULL;
g_return_val_if_fail (factories != NULL, FALSE);
g_return_val_if_fail (factories->n_values > 0, FALSE);
GST_DEBUG_OBJECT (parsebin,
"pad %s:%s , chain:%p, %d factories, caps %" GST_PTR_FORMAT,
GST_DEBUG_PAD_NAME (pad), chain, factories->n_values, caps);
error_details = g_string_new ("");
/* 2. Try to create an element and link to it */
while (factories->n_values > 0) {
GstAutoplugSelectResult ret;
GstElementFactory *factory;
GstParseElement *pelem;
GstElement *element;
GstPad *sinkpad;
GParamSpec *pspec;
gboolean subtitle;
GList *to_connect = NULL;
gboolean is_parser_converter = FALSE, is_simple_demuxer = FALSE;
/* Set parsepad target to pad again, it might've been unset
* below but we came back here because something failed
*/
parse_pad_set_target (parsepad, pad);
/* take first factory */
factory = g_value_get_object (g_value_array_get_nth (factories, 0));
/* Remove selected factory from the list. */
g_value_array_remove (factories, 0);
GST_LOG_OBJECT (src, "trying factory %" GST_PTR_FORMAT, factory);
/* Check if the caps are really supported by the factory. The
* factory list is non-empty-subset filtered while caps
* are only accepted by a pad if they are a subset of the
* pad caps.
*
* FIXME: Only do this for fixed caps here. Non-fixed caps
* can happen if a Parser/Converter was autoplugged before
* this. We then assume that it will be able to convert to
* everything that the parser would want.
*
* A subset check will fail here because the parser caps
* will be generic and while the parser will only
* support a subset of the parser caps.
*/
if (gst_caps_is_fixed (caps)) {
const GList *templs;
gboolean skip = FALSE;
templs = gst_element_factory_get_static_pad_templates (factory);
while (templs) {
GstStaticPadTemplate *templ = (GstStaticPadTemplate *) templs->data;
if (templ->direction == GST_PAD_SINK) {
GstCaps *templcaps = gst_static_caps_get (&templ->static_caps);
if (!gst_caps_is_subset (caps, templcaps)) {
GST_DEBUG_OBJECT (src,
"caps %" GST_PTR_FORMAT " not subset of %" GST_PTR_FORMAT, caps,
templcaps);
gst_caps_unref (templcaps);
skip = TRUE;
break;
}
gst_caps_unref (templcaps);
}
templs = g_list_next (templs);
}
if (skip)
continue;
}
/* If the factory is for a parser we first check if the factory
* was already used for the current chain. If it was used already
* we would otherwise create an infinite loop here because the
* parser apparently accepts its own output as input.
* This is only done for parsers because it's perfectly valid
* to have other element classes after each other because a
* parser is the only one that does not change the data. A
* valid example for this would be multiple id3demux in a row.
*/
is_parser_converter = strstr (gst_element_factory_get_metadata (factory,
GST_ELEMENT_METADATA_KLASS), "Parser") != NULL;
is_simple_demuxer = is_simple_demuxer_factory (factory);
if (is_parser_converter) {
gboolean skip = FALSE;
GList *l;
CHAIN_MUTEX_LOCK (chain);
for (l = chain->elements; l; l = l->next) {
GstParseElement *pelem = (GstParseElement *) l->data;
GstElement *otherelement = pelem->element;
if (gst_element_get_factory (otherelement) == factory) {
skip = TRUE;
break;
}
}
if (!skip && chain->parent && chain->parent->parent) {
GstParseChain *parent_chain = chain->parent->parent;
GstParseElement *pelem =
parent_chain->elements ? parent_chain->elements->data : NULL;
if (pelem && gst_element_get_factory (pelem->element) == factory)
skip = TRUE;
}
CHAIN_MUTEX_UNLOCK (chain);
if (skip) {
GST_DEBUG_OBJECT (parsebin,
"Skipping factory '%s' because it was already used in this chain",
gst_plugin_feature_get_name (GST_PLUGIN_FEATURE_CAST (factory)));
continue;
}
}
/* Expose pads if the next factory is a decoder */
if (gst_element_factory_list_is_type (factory,
GST_ELEMENT_FACTORY_TYPE_DECODER)) {
ret = GST_AUTOPLUG_SELECT_EXPOSE;
} else {
/* emit autoplug-select to see what we should do with it. */
g_signal_emit (G_OBJECT (parsebin),
gst_parse_bin_signals[SIGNAL_AUTOPLUG_SELECT],
0, parsepad, caps, factory, &ret);
}
switch (ret) {
case GST_AUTOPLUG_SELECT_TRY:
GST_DEBUG_OBJECT (parsebin, "autoplug select requested try");
break;
case GST_AUTOPLUG_SELECT_EXPOSE:
GST_DEBUG_OBJECT (parsebin, "autoplug select requested expose");
/* expose the pad, we don't have the source element */
expose_pad (parsebin, src, parsepad, pad, caps, chain);
res = TRUE;
goto beach;
case GST_AUTOPLUG_SELECT_SKIP:
GST_DEBUG_OBJECT (parsebin, "autoplug select requested skip");
continue;
default:
GST_WARNING_OBJECT (parsebin, "autoplug select returned unhandled %d",
ret);
break;
}
/* 2.0. Unlink pad */
parse_pad_set_target (parsepad, NULL);
/* 2.1. Try to create an element */
if ((element = gst_element_factory_create (factory, NULL)) == NULL) {
GST_WARNING_OBJECT (parsebin, "Could not create an element from %s",
gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory)));
g_string_append_printf (error_details,
"Could not create an element from %s\n",
gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory)));
continue;
}
/* Filter errors, this will prevent the element from causing the pipeline
* to error while we test it using READY state. */
add_error_filter (parsebin, element);
/* We don't yet want the bin to control the element's state */
gst_element_set_locked_state (element, TRUE);
/* ... add it ... */
if (!(gst_bin_add (GST_BIN_CAST (parsebin), element))) {
GST_WARNING_OBJECT (parsebin, "Couldn't add %s to the bin",
GST_ELEMENT_NAME (element));
remove_error_filter (parsebin, element, NULL);
g_string_append_printf (error_details, "Couldn't add %s to the bin\n",
GST_ELEMENT_NAME (element));
gst_object_unref (element);
continue;
}
/* Find its sink pad. */
sinkpad = NULL;
GST_OBJECT_LOCK (element);
if (element->sinkpads != NULL)
sinkpad = gst_object_ref (element->sinkpads->data);
GST_OBJECT_UNLOCK (element);
if (sinkpad == NULL) {
GST_WARNING_OBJECT (parsebin, "Element %s doesn't have a sink pad",
GST_ELEMENT_NAME (element));
remove_error_filter (parsebin, element, NULL);
g_string_append_printf (error_details,
"Element %s doesn't have a sink pad", GST_ELEMENT_NAME (element));
gst_bin_remove (GST_BIN (parsebin), element);
continue;
}
/* ... and try to link */
if ((gst_pad_link_full (pad, sinkpad,
GST_PAD_LINK_CHECK_NOTHING)) != GST_PAD_LINK_OK) {
GST_WARNING_OBJECT (parsebin, "Link failed on pad %s:%s",
GST_DEBUG_PAD_NAME (sinkpad));
remove_error_filter (parsebin, element, NULL);
g_string_append_printf (error_details, "Link failed on pad %s:%s",
GST_DEBUG_PAD_NAME (sinkpad));
gst_object_unref (sinkpad);
gst_bin_remove (GST_BIN (parsebin), element);
continue;
}
/* ... activate it ... */
if ((gst_element_set_state (element,
GST_STATE_READY)) == GST_STATE_CHANGE_FAILURE) {
GstMessage *error_msg;
GST_WARNING_OBJECT (parsebin, "Couldn't set %s to READY",
GST_ELEMENT_NAME (element));
remove_error_filter (parsebin, element, &error_msg);
if (error_msg) {
gchar *error_string = error_message_to_string (error_msg);
g_string_append_printf (error_details, "Couldn't set %s to READY:\n%s",
GST_ELEMENT_NAME (element), error_string);
gst_message_unref (error_msg);
g_free (error_string);
} else {
g_string_append_printf (error_details, "Couldn't set %s to READY",
GST_ELEMENT_NAME (element));
}
gst_object_unref (sinkpad);
gst_bin_remove (GST_BIN (parsebin), element);
continue;
}
/* check if we still accept the caps on the pad after setting
* the element to READY */
if (!gst_pad_query_accept_caps (sinkpad, caps)) {
GstMessage *error_msg;
GST_WARNING_OBJECT (parsebin, "Element %s does not accept caps",
GST_ELEMENT_NAME (element));
remove_error_filter (parsebin, element, &error_msg);
if (error_msg) {
gchar *error_string = error_message_to_string (error_msg);
g_string_append_printf (error_details,
"Element %s does not accept caps:\n%s", GST_ELEMENT_NAME (element),
error_string);
gst_message_unref (error_msg);
g_free (error_string);
} else {
g_string_append_printf (error_details,
"Element %s does not accept caps", GST_ELEMENT_NAME (element));
}
gst_element_set_state (element, GST_STATE_NULL);
gst_object_unref (sinkpad);
gst_bin_remove (GST_BIN (parsebin), element);
continue;
}
gst_object_unref (sinkpad);
GST_LOG_OBJECT (parsebin, "linked on pad %s:%s", GST_DEBUG_PAD_NAME (pad));
CHAIN_MUTEX_LOCK (chain);
pelem = g_slice_new0 (GstParseElement);
pelem->element = gst_object_ref (element);
pelem->capsfilter = NULL;
chain->elements = g_list_prepend (chain->elements, pelem);
chain->demuxer = is_demuxer_element (element);
/* If we plugging a parser, mark the chain as parsed */
chain->parsed |= is_parser_converter;
CHAIN_MUTEX_UNLOCK (chain);
/* Set connection-speed property if needed */
if (chain->demuxer) {
GParamSpec *pspec;
if ((pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (element),
"connection-speed"))) {
guint64 speed = parsebin->connection_speed / 1000;
gboolean wrong_type = FALSE;
if (G_PARAM_SPEC_TYPE (pspec) == G_TYPE_PARAM_UINT) {
GParamSpecUInt *pspecuint = G_PARAM_SPEC_UINT (pspec);
speed = CLAMP (speed, pspecuint->minimum, pspecuint->maximum);
} else if (G_PARAM_SPEC_TYPE (pspec) == G_TYPE_PARAM_INT) {
GParamSpecInt *pspecint = G_PARAM_SPEC_INT (pspec);
speed = CLAMP (speed, pspecint->minimum, pspecint->maximum);
} else if (G_PARAM_SPEC_TYPE (pspec) == G_TYPE_PARAM_UINT64) {
GParamSpecUInt64 *pspecuint = G_PARAM_SPEC_UINT64 (pspec);
speed = CLAMP (speed, pspecuint->minimum, pspecuint->maximum);
} else if (G_PARAM_SPEC_TYPE (pspec) == G_TYPE_PARAM_INT64) {
GParamSpecInt64 *pspecint = G_PARAM_SPEC_INT64 (pspec);
speed = CLAMP (speed, pspecint->minimum, pspecint->maximum);
} else {
GST_WARNING_OBJECT (parsebin,
"The connection speed property %" G_GUINT64_FORMAT " of type %s"
" is not usefull not setting it", speed,
g_type_name (G_PARAM_SPEC_TYPE (pspec)));
wrong_type = TRUE;
}
if (!wrong_type) {
GST_DEBUG_OBJECT (parsebin,
"setting connection-speed=%" G_GUINT64_FORMAT
" to demuxer element", speed);
g_object_set (element, "connection-speed", speed, NULL);
}
}
}
/* try to configure the subtitle encoding property when we can */
pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (element),
"subtitle-encoding");
if (pspec && G_PARAM_SPEC_VALUE_TYPE (pspec) == G_TYPE_STRING) {
SUBTITLE_LOCK (parsebin);
GST_DEBUG_OBJECT (parsebin,
"setting subtitle-encoding=%s to element", parsebin->encoding);
g_object_set (G_OBJECT (element), "subtitle-encoding", parsebin->encoding,
NULL);
SUBTITLE_UNLOCK (parsebin);
subtitle = TRUE;
} else {
subtitle = FALSE;
}
/* link this element further */
to_connect = connect_element (parsebin, pelem, chain);
if ((is_simple_demuxer || is_parser_converter) && to_connect) {
GList *l;
for (l = to_connect; l; l = g_list_next (l)) {
GstPad *opad = GST_PAD_CAST (l->data);
GstCaps *ocaps;
ocaps = get_pad_caps (opad);
analyze_new_pad (parsebin, pelem->element, opad, ocaps, chain);
if (ocaps)
gst_caps_unref (ocaps);
gst_object_unref (opad);
}
g_list_free (to_connect);
to_connect = NULL;
}
/* Bring the element to the state of the parent */
/* First lock element's sinkpad stream lock so no data reaches
* the possible new element added when caps are sent by element
* while we're still sending sticky events */
GST_PAD_STREAM_LOCK (sinkpad);
if ((gst_element_set_state (element,
GST_STATE_PAUSED)) == GST_STATE_CHANGE_FAILURE) {
GstParseElement *dtmp = NULL;
GstElement *tmp = NULL;
GstMessage *error_msg;
GST_PAD_STREAM_UNLOCK (sinkpad);
GST_WARNING_OBJECT (parsebin, "Couldn't set %s to PAUSED",
GST_ELEMENT_NAME (element));
g_list_free_full (to_connect, (GDestroyNotify) gst_object_unref);
to_connect = NULL;
remove_error_filter (parsebin, element, &error_msg);
if (error_msg) {
gchar *error_string = error_message_to_string (error_msg);
g_string_append_printf (error_details, "Couldn't set %s to PAUSED:\n%s",
GST_ELEMENT_NAME (element), error_string);
gst_message_unref (error_msg);
g_free (error_string);
} else {
g_string_append_printf (error_details, "Couldn't set %s to PAUSED",
GST_ELEMENT_NAME (element));
}
/* Remove all elements in this chain that were just added. No
* other thread could've added elements in the meantime */
CHAIN_MUTEX_LOCK (chain);
do {
GList *l;
dtmp = chain->elements->data;
tmp = dtmp->element;
/* Disconnect any signal handlers that might be connected
* in connect_element() or analyze_pad() */
if (dtmp->pad_added_id)
g_signal_handler_disconnect (tmp, dtmp->pad_added_id);
if (dtmp->pad_removed_id)
g_signal_handler_disconnect (tmp, dtmp->pad_removed_id);
if (dtmp->no_more_pads_id)
g_signal_handler_disconnect (tmp, dtmp->no_more_pads_id);
for (l = chain->pending_pads; l;) {
GstPendingPad *pp = l->data;
GList *n;
if (GST_PAD_PARENT (pp->pad) != tmp) {
l = l->next;
continue;
}
gst_pending_pad_free (pp);
/* Remove element from the list, update list head and go to the
* next element in the list */
n = l->next;
chain->pending_pads = g_list_delete_link (chain->pending_pads, l);
l = n;
}
if (dtmp->capsfilter) {
gst_bin_remove (GST_BIN (parsebin), dtmp->capsfilter);
gst_element_set_state (dtmp->capsfilter, GST_STATE_NULL);
gst_object_unref (dtmp->capsfilter);
}
gst_bin_remove (GST_BIN (parsebin), tmp);
gst_element_set_state (tmp, GST_STATE_NULL);
gst_object_unref (tmp);
g_slice_free (GstParseElement, dtmp);
chain->elements = g_list_delete_link (chain->elements, chain->elements);
} while (tmp != element);
CHAIN_MUTEX_UNLOCK (chain);
continue;
} else {
send_sticky_events (parsebin, pad);
/* Everything went well, the spice must flow now */
GST_PAD_STREAM_UNLOCK (sinkpad);
}
/* Remove error filter now, from now on we can't gracefully
* handle errors of the element anymore */
remove_error_filter (parsebin, element, NULL);
/* Now let the bin handle the state */
gst_element_set_locked_state (element, FALSE);
if (subtitle) {
SUBTITLE_LOCK (parsebin);
/* we added the element now, add it to the list of subtitle-encoding
* elements when we can set the property */
parsebin->subtitles = g_list_prepend (parsebin->subtitles, element);
SUBTITLE_UNLOCK (parsebin);
}
if (to_connect) {
GList *l;
for (l = to_connect; l; l = g_list_next (l)) {
GstPad *opad = GST_PAD_CAST (l->data);
GstCaps *ocaps;
ocaps = get_pad_caps (opad);
analyze_new_pad (parsebin, pelem->element, opad, ocaps, chain);
if (ocaps)
gst_caps_unref (ocaps);
gst_object_unref (opad);
}
g_list_free (to_connect);
to_connect = NULL;
}
res = TRUE;
break;
}
beach:
if (error_details)
*deadend_details = g_string_free (error_details, (error_details->len == 0
|| res));
else
*deadend_details = NULL;
return res;
}
static GstCaps *
get_pad_caps (GstPad * pad)
{
GstCaps *caps;
/* first check the pad caps, if this is set, we are positively sure it is
* fixed and exactly what the element will produce. */
caps = gst_pad_get_current_caps (pad);
/* then use the getcaps function if we don't have caps. These caps might not
* be fixed in some cases, in which case analyze_new_pad will set up a
* notify::caps signal to continue autoplugging. */
if (caps == NULL)
caps = gst_pad_query_caps (pad, NULL);
return caps;
}
/* Returns a list of pads that can be connected to already and
* connects to pad-added and related signals */
static GList *
connect_element (GstParseBin * parsebin, GstParseElement * pelem,
GstParseChain * chain)
{
GstElement *element = pelem->element;
GList *pads;
gboolean dynamic = FALSE;
GList *to_connect = NULL;
GST_DEBUG_OBJECT (parsebin,
"Attempting to connect element %s [chain:%p] further",
GST_ELEMENT_NAME (element), chain);
/* 1. Loop over pad templates, grabbing existing pads along the way */
for (pads = GST_ELEMENT_GET_CLASS (element)->padtemplates; pads;
pads = g_list_next (pads)) {
GstPadTemplate *templ = GST_PAD_TEMPLATE (pads->data);
const gchar *templ_name;
/* we are only interested in source pads */
if (GST_PAD_TEMPLATE_DIRECTION (templ) != GST_PAD_SRC)
continue;
templ_name = GST_PAD_TEMPLATE_NAME_TEMPLATE (templ);
GST_DEBUG_OBJECT (parsebin, "got a source pad template %s", templ_name);
/* figure out what kind of pad this is */
switch (GST_PAD_TEMPLATE_PRESENCE (templ)) {
case GST_PAD_ALWAYS:
{
/* get the pad that we need to autoplug */
GstPad *pad = gst_element_get_static_pad (element, templ_name);
if (pad) {
GST_DEBUG_OBJECT (parsebin, "got the pad for always template %s",
templ_name);
/* here is the pad, we need to autoplug it */
to_connect = g_list_prepend (to_connect, pad);
} else {
/* strange, pad is marked as always but it's not
* there. Fix the element */
GST_WARNING_OBJECT (parsebin,
"could not get the pad for always template %s", templ_name);
}
break;
}
case GST_PAD_SOMETIMES:
{
/* try to get the pad to see if it is already created or
* not */
GstPad *pad = gst_element_get_static_pad (element, templ_name);
if (pad) {
GST_DEBUG_OBJECT (parsebin, "got the pad for sometimes template %s",
templ_name);
/* the pad is created, we need to autoplug it */
to_connect = g_list_prepend (to_connect, pad);
} else {
GST_DEBUG_OBJECT (parsebin,
"did not get the sometimes pad of template %s", templ_name);
/* we have an element that will create dynamic pads */
dynamic = TRUE;
}
break;
}
case GST_PAD_REQUEST:
/* ignore request pads */
GST_DEBUG_OBJECT (parsebin, "ignoring request padtemplate %s",
templ_name);
break;
}
}
/* 2. if there are more potential pads, connect to relevant signals */
if (dynamic) {
GST_LOG_OBJECT (parsebin, "Adding signals to element %s in chain %p",
GST_ELEMENT_NAME (element), chain);
pelem->pad_added_id = g_signal_connect (element, "pad-added",
G_CALLBACK (pad_added_cb), chain);
pelem->pad_removed_id = g_signal_connect (element, "pad-removed",
G_CALLBACK (pad_removed_cb), chain);
pelem->no_more_pads_id = g_signal_connect (element, "no-more-pads",
G_CALLBACK (no_more_pads_cb), chain);
}
/* 3. return all pads that can be connected to already */
return to_connect;
}
/* expose_pad:
*
* Expose the given pad on the chain as a parsed pad.
*/
static void
expose_pad (GstParseBin * parsebin, GstElement * src, GstParsePad * parsepad,
GstPad * pad, GstCaps * caps, GstParseChain * chain)
{
GST_DEBUG_OBJECT (parsebin, "pad %s:%s, chain:%p",
GST_DEBUG_PAD_NAME (pad), chain);
gst_parse_pad_activate (parsepad, chain);
chain->endpad = gst_object_ref (parsepad);
if (caps)
chain->endcaps = gst_caps_ref (caps);
else
chain->endcaps = NULL;
}
static void
type_found (GstElement * typefind, guint probability,
GstCaps * caps, GstParseBin * parse_bin)
{
GstPad *pad, *sink_pad;
GST_DEBUG_OBJECT (parse_bin, "typefind found caps %" GST_PTR_FORMAT, caps);
/* If the typefinder (but not something else) finds text/plain - i.e. that's
* the top-level type of the file - then error out.
*/
if (gst_structure_has_name (gst_caps_get_structure (caps, 0), "text/plain")) {
GST_ELEMENT_ERROR (parse_bin, STREAM, WRONG_TYPE,
(_("This appears to be a text file")),
("ParseBin cannot parse plain text files"));
goto exit;
}
/* FIXME: we can only deal with one type, we don't yet support dynamically changing
* caps from the typefind element */
if (parse_bin->have_type || parse_bin->parse_chain)
goto exit;
parse_bin->have_type = TRUE;
pad = gst_element_get_static_pad (typefind, "src");
sink_pad = gst_element_get_static_pad (typefind, "sink");
/* need some lock here to prevent race with shutdown state change
* which might yank away e.g. parse_chain while building stuff here.
* In typical cases, STREAM_LOCK is held and handles that, it need not
* be held (if called from a proxied setcaps), so grab it anyway */
GST_PAD_STREAM_LOCK (sink_pad);
parse_bin->parse_chain = gst_parse_chain_new (parse_bin, NULL, pad, caps);
analyze_new_pad (parse_bin, typefind, pad, caps, parse_bin->parse_chain);
GST_PAD_STREAM_UNLOCK (sink_pad);
gst_object_unref (sink_pad);
gst_object_unref (pad);
exit:
return;
}
static GstPadProbeReturn
pad_event_cb (GstPad * pad, GstPadProbeInfo * info, gpointer data)
{
GstEvent *event = GST_PAD_PROBE_INFO_EVENT (info);
GstPendingPad *ppad = (GstPendingPad *) data;
GstParseChain *chain = ppad->chain;
GstParseBin *parsebin = chain->parsebin;
g_assert (ppad);
g_assert (chain);
g_assert (parsebin);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
GST_DEBUG_OBJECT (pad, "Received EOS on a non final pad, this stream "
"ended too early");
chain->deadend = TRUE;
chain->drained = TRUE;
gst_object_replace ((GstObject **) & chain->current_pad, NULL);
/* we don't set the endcaps because NULL endcaps means early EOS */
EXPOSE_LOCK (parsebin);
if (parsebin->parse_chain)
if (gst_parse_chain_is_complete (parsebin->parse_chain))
gst_parse_bin_expose (parsebin);
EXPOSE_UNLOCK (parsebin);
break;
default:
break;
}
return GST_PAD_PROBE_OK;
}
static void
pad_added_cb (GstElement * element, GstPad * pad, GstParseChain * chain)
{
GstCaps *caps;
GstParseBin *parsebin;
parsebin = chain->parsebin;
GST_DEBUG_OBJECT (pad, "pad added, chain:%p", chain);
caps = get_pad_caps (pad);
analyze_new_pad (parsebin, element, pad, caps, chain);
if (caps)
gst_caps_unref (caps);
EXPOSE_LOCK (parsebin);
if (parsebin->parse_chain) {
if (gst_parse_chain_is_complete (parsebin->parse_chain)) {
GST_LOG_OBJECT (parsebin,
"That was the last dynamic object, now attempting to expose the group");
if (!gst_parse_bin_expose (parsebin))
GST_WARNING_OBJECT (parsebin, "Couldn't expose group");
}
} else {
GST_DEBUG_OBJECT (parsebin, "No parse chain, new pad ignored");
}
EXPOSE_UNLOCK (parsebin);
}
static void
pad_removed_cb (GstElement * element, GstPad * pad, GstParseChain * chain)
{
GList *l;
GST_LOG_OBJECT (pad, "pad removed, chain:%p", chain);
/* In fact, we don't have to do anything here, the active group will be
* removed when the group's multiqueue is drained */
CHAIN_MUTEX_LOCK (chain);
for (l = chain->pending_pads; l; l = l->next) {
GstPendingPad *ppad = l->data;
GstPad *opad = ppad->pad;
if (pad == opad) {
gst_pending_pad_free (ppad);
chain->pending_pads = g_list_delete_link (chain->pending_pads, l);
break;
}
}
CHAIN_MUTEX_UNLOCK (chain);
}
static void
no_more_pads_cb (GstElement * element, GstParseChain * chain)
{
GstParseGroup *group = NULL;
GST_LOG_OBJECT (element, "got no more pads");
CHAIN_MUTEX_LOCK (chain);
if (!chain->elements
|| ((GstParseElement *) chain->elements->data)->element != element) {
GST_LOG_OBJECT (chain->parsebin, "no-more-pads from old chain element '%s'",
GST_OBJECT_NAME (element));
CHAIN_MUTEX_UNLOCK (chain);
return;
} else if (!chain->demuxer) {
GST_LOG_OBJECT (chain->parsebin,
"no-more-pads from a non-demuxer element '%s'",
GST_OBJECT_NAME (element));
CHAIN_MUTEX_UNLOCK (chain);
return;
}
/* when we received no_more_pads, we can complete the pads of the chain */
if (!chain->next_groups && chain->active_group) {
group = chain->active_group;
} else if (chain->next_groups) {
GList *iter;
for (iter = chain->next_groups; iter; iter = g_list_next (iter)) {
group = iter->data;
if (!group->no_more_pads)
break;
}
}
if (!group) {
GST_ERROR_OBJECT (chain->parsebin, "can't find group for element");
CHAIN_MUTEX_UNLOCK (chain);
return;
}
GST_DEBUG_OBJECT (element, "Setting group %p to complete", group);
group->no_more_pads = TRUE;
CHAIN_MUTEX_UNLOCK (chain);
EXPOSE_LOCK (chain->parsebin);
if (chain->parsebin->parse_chain) {
if (gst_parse_chain_is_complete (chain->parsebin->parse_chain)) {
gst_parse_bin_expose (chain->parsebin);
}
}
EXPOSE_UNLOCK (chain->parsebin);
}
static void
caps_notify_cb (GstPad * pad, GParamSpec * unused, GstParseChain * chain)
{
GstElement *element;
GList *l;
GST_LOG_OBJECT (pad, "Notified caps for pad %s:%s", GST_DEBUG_PAD_NAME (pad));
/* Disconnect this; if we still need it, we'll reconnect to this in
* analyze_new_pad */
element = GST_ELEMENT_CAST (gst_pad_get_parent (pad));
CHAIN_MUTEX_LOCK (chain);
for (l = chain->pending_pads; l; l = l->next) {
GstPendingPad *ppad = l->data;
if (ppad->pad == pad) {
gst_pending_pad_free (ppad);
chain->pending_pads = g_list_delete_link (chain->pending_pads, l);
break;
}
}
CHAIN_MUTEX_UNLOCK (chain);
pad_added_cb (element, pad, chain);
gst_object_unref (element);
}
/* Decide whether an element is a demuxer based on the
* klass and number/type of src pad templates it has */
static gboolean
is_demuxer_element (GstElement * srcelement)
{
GstElementFactory *srcfactory;
GstElementClass *elemclass;
GList *walk;
const gchar *klass;
gint potential_src_pads = 0;
srcfactory = gst_element_get_factory (srcelement);
klass =
gst_element_factory_get_metadata (srcfactory, GST_ELEMENT_METADATA_KLASS);
/* Can't be a demuxer unless it has Demux in the klass name */
if (!strstr (klass, "Demux"))
return FALSE;
/* Walk the src pad templates and count how many the element
* might produce */
elemclass = GST_ELEMENT_GET_CLASS (srcelement);
walk = gst_element_class_get_pad_template_list (elemclass);
while (walk != NULL) {
GstPadTemplate *templ;
templ = (GstPadTemplate *) walk->data;
if (GST_PAD_TEMPLATE_DIRECTION (templ) == GST_PAD_SRC) {
switch (GST_PAD_TEMPLATE_PRESENCE (templ)) {
case GST_PAD_ALWAYS:
case GST_PAD_SOMETIMES:
if (strstr (GST_PAD_TEMPLATE_NAME_TEMPLATE (templ), "%"))
potential_src_pads += 2; /* Might make multiple pads */
else
potential_src_pads += 1;
break;
case GST_PAD_REQUEST:
potential_src_pads += 2;
break;
}
}
walk = g_list_next (walk);
}
if (potential_src_pads < 2)
return FALSE;
return TRUE;
}
/* gst_parse_chain_get_current_group:
*
* Returns the current group of this chain, to which
* new chains should be attached or NULL if the last
* group didn't have no-more-pads.
*
* Not MT-safe: Call with parent chain lock!
*/
static GstParseGroup *
gst_parse_chain_get_current_group (GstParseChain * chain)
{
GstParseGroup *group;
/* Now we know that we can really return something useful */
if (!chain->active_group) {
chain->active_group = group = gst_parse_group_new (chain->parsebin, chain);
} else if (!chain->active_group->no_more_pads) {
group = chain->active_group;
} else {
GList *iter;
group = NULL;
for (iter = chain->next_groups; iter; iter = g_list_next (iter)) {
GstParseGroup *next_group = iter->data;
if (!next_group->no_more_pads) {
group = next_group;
break;
}
}
}
if (!group) {
group = gst_parse_group_new (chain->parsebin, chain);
chain->next_groups = g_list_append (chain->next_groups, group);
}
return group;
}
static void gst_parse_group_free_internal (GstParseGroup * group,
gboolean hide);
static void
gst_parse_chain_free_internal (GstParseChain * chain, gboolean hide)
{
GList *l, *set_to_null = NULL;
CHAIN_MUTEX_LOCK (chain);
GST_DEBUG_OBJECT (chain->parsebin, "%s chain %p",
(hide ? "Hiding" : "Freeing"), chain);
if (chain->active_group) {
gst_parse_group_free_internal (chain->active_group, hide);
if (!hide)
chain->active_group = NULL;
}
for (l = chain->next_groups; l; l = l->next) {
gst_parse_group_free_internal ((GstParseGroup *) l->data, hide);
if (!hide)
l->data = NULL;
}
if (!hide) {
g_list_free (chain->next_groups);
chain->next_groups = NULL;
}
if (!hide) {
for (l = chain->old_groups; l; l = l->next) {
GstParseGroup *group = l->data;
gst_parse_group_free (group);
}
g_list_free (chain->old_groups);
chain->old_groups = NULL;
}
gst_object_replace ((GstObject **) & chain->current_pad, NULL);
for (l = chain->pending_pads; l; l = l->next) {
GstPendingPad *ppad = l->data;
gst_pending_pad_free (ppad);
l->data = NULL;
}
g_list_free (chain->pending_pads);
chain->pending_pads = NULL;
for (l = chain->elements; l; l = l->next) {
GstParseElement *pelem = l->data;
GstElement *element = pelem->element;
if (pelem->pad_added_id)
g_signal_handler_disconnect (element, pelem->pad_added_id);
pelem->pad_added_id = 0;
if (pelem->pad_removed_id)
g_signal_handler_disconnect (element, pelem->pad_removed_id);
pelem->pad_removed_id = 0;
if (pelem->no_more_pads_id)
g_signal_handler_disconnect (element, pelem->no_more_pads_id);
pelem->no_more_pads_id = 0;
if (pelem->capsfilter) {
if (GST_OBJECT_PARENT (pelem->capsfilter) ==
GST_OBJECT_CAST (chain->parsebin))
gst_bin_remove (GST_BIN_CAST (chain->parsebin), pelem->capsfilter);
if (!hide) {
set_to_null =
g_list_append (set_to_null, gst_object_ref (pelem->capsfilter));
}
}
if (GST_OBJECT_PARENT (element) == GST_OBJECT_CAST (chain->parsebin))
gst_bin_remove (GST_BIN_CAST (chain->parsebin), element);
if (!hide) {
set_to_null = g_list_append (set_to_null, gst_object_ref (element));
}
SUBTITLE_LOCK (chain->parsebin);
/* remove possible subtitle element */
chain->parsebin->subtitles =
g_list_remove (chain->parsebin->subtitles, element);
SUBTITLE_UNLOCK (chain->parsebin);
if (!hide) {
if (pelem->capsfilter) {
gst_object_unref (pelem->capsfilter);
pelem->capsfilter = NULL;
}
gst_object_unref (element);
l->data = NULL;
g_slice_free (GstParseElement, pelem);
}
}
if (!hide) {
g_list_free (chain->elements);
chain->elements = NULL;
}
if (chain->endpad) {
if (chain->endpad->exposed) {
GstPad *endpad = GST_PAD_CAST (chain->endpad);
GST_DEBUG_OBJECT (chain->parsebin, "Removing pad %s:%s",
GST_DEBUG_PAD_NAME (endpad));
gst_pad_push_event (endpad, gst_event_new_eos ());
gst_element_remove_pad (GST_ELEMENT_CAST (chain->parsebin), endpad);
}
parse_pad_set_target (chain->endpad, NULL);
chain->endpad->exposed = FALSE;
if (!hide) {
gst_object_unref (chain->endpad);
chain->endpad = NULL;
}
}
if (!hide && chain->current_pad) {
gst_object_unref (chain->current_pad);
chain->current_pad = NULL;
}
if (chain->pad) {
gst_object_unref (chain->pad);
chain->pad = NULL;
}
if (chain->start_caps) {
gst_caps_unref (chain->start_caps);
chain->start_caps = NULL;
}
if (chain->endcaps) {
gst_caps_unref (chain->endcaps);
chain->endcaps = NULL;
}
g_free (chain->deadend_details);
chain->deadend_details = NULL;
GST_DEBUG_OBJECT (chain->parsebin, "%s chain %p", (hide ? "Hidden" : "Freed"),
chain);
CHAIN_MUTEX_UNLOCK (chain);
while (set_to_null) {
GstElement *element = set_to_null->data;
set_to_null = g_list_delete_link (set_to_null, set_to_null);
gst_element_set_state (element, GST_STATE_NULL);
gst_object_unref (element);
}
if (!hide) {
g_mutex_clear (&chain->lock);
g_slice_free (GstParseChain, chain);
}
}
/* gst_parse_chain_free:
*
* Completely frees and removes the chain and all
* child groups from ParseBin.
*
* MT-safe, don't hold the chain lock or any child chain's lock
* when calling this!
*/
static void
gst_parse_chain_free (GstParseChain * chain)
{
gst_parse_chain_free_internal (chain, FALSE);
}
/* gst_parse_chain_new:
*
* Creates a new parse chain and initializes it.
*
* It's up to the caller to add it to the list of child chains of
* a group!
*/
static GstParseChain *
gst_parse_chain_new (GstParseBin * parsebin, GstParseGroup * parent,
GstPad * pad, GstCaps * start_caps)
{
GstParseChain *chain = g_slice_new0 (GstParseChain);
GST_DEBUG_OBJECT (parsebin, "Creating new chain %p with parent group %p",
chain, parent);
chain->parsebin = parsebin;
chain->parent = parent;
g_mutex_init (&chain->lock);
chain->pad = gst_object_ref (pad);
if (start_caps)
chain->start_caps = gst_caps_ref (start_caps);
return chain;
}
/****
* GstParseGroup functions
****/
static void
gst_parse_group_free_internal (GstParseGroup * group, gboolean hide)
{
GList *l;
GST_DEBUG_OBJECT (group->parsebin, "%s group %p",
(hide ? "Hiding" : "Freeing"), group);
for (l = group->children; l; l = l->next) {
GstParseChain *chain = (GstParseChain *) l->data;
gst_parse_chain_free_internal (chain, hide);
if (!hide)
l->data = NULL;
}
if (!hide) {
g_list_free (group->children);
group->children = NULL;
}
GST_DEBUG_OBJECT (group->parsebin, "%s group %p", (hide ? "Hid" : "Freed"),
group);
if (!hide)
g_slice_free (GstParseGroup, group);
}
/* gst_parse_group_free:
*
* Completely frees and removes the parse group and all
* it's children.
*
* Never call this from any streaming thread!
*
* Not MT-safe, call with parent's chain lock!
*/
static void
gst_parse_group_free (GstParseGroup * group)
{
gst_parse_group_free_internal (group, FALSE);
}
/* gst_parse_group_hide:
*
* Hide the parse group only, this means that
* all child endpads are removed from ParseBin
* and all signals are unconnected.
*
* No element is set to NULL state and completely
* unrefed here.
*
* Can be called from streaming threads.
*
* Not MT-safe, call with parent's chain lock!
*/
static void
gst_parse_group_hide (GstParseGroup * group)
{
gst_parse_group_free_internal (group, TRUE);
}
/* gst_parse_chain_free_hidden_groups:
*
* Frees any parse groups that were hidden previously.
* This allows keeping memory use from ballooning when
* switching chains repeatedly.
*
* A new throwaway thread will be created to free the
* groups, so any delay does not block the setup of a
* new group.
*
* Not MT-safe, call with parent's chain lock!
*/
static void
gst_parse_chain_free_hidden_groups (GList * old_groups)
{
GList *l;
for (l = old_groups; l; l = l->next) {
GstParseGroup *group = l->data;
gst_parse_group_free (group);
}
g_list_free (old_groups);
}
static void
gst_parse_chain_start_free_hidden_groups_thread (GstParseChain * chain)
{
GThread *thread;
GError *error = NULL;
GList *old_groups;
old_groups = chain->old_groups;
if (!old_groups)
return;
chain->old_groups = NULL;
thread = g_thread_try_new ("free-hidden-groups",
(GThreadFunc) gst_parse_chain_free_hidden_groups, old_groups, &error);
if (!thread || error) {
GST_ERROR ("Failed to start free-hidden-groups thread: %s",
error ? error->message : "unknown reason");
g_clear_error (&error);
chain->old_groups = old_groups;
return;
}
GST_DEBUG_OBJECT (chain->parsebin, "Started free-hidden-groups thread");
/* We do not need to wait for it or get any results from it */
g_thread_unref (thread);
}
/* gst_parse_group_new:
* @parsebin: Parent ParseBin
* @parent: Parent chain or %NULL
*
* Creates a new GstParseGroup. It is up to the caller to add it to the list
* of groups.
*/
static GstParseGroup *
gst_parse_group_new (GstParseBin * parsebin, GstParseChain * parent)
{
GstParseGroup *group = g_slice_new0 (GstParseGroup);
GST_DEBUG_OBJECT (parsebin, "Creating new group %p with parent chain %p",
group, parent);
group->parsebin = parsebin;
group->parent = parent;
return group;
}
/* gst_parse_group_is_complete:
*
* Checks if the group is complete, this means that
* a) no-more-pads happened
* b) all child chains are complete
*
* Not MT-safe, always call with ParseBin expose lock
*/
static gboolean
gst_parse_group_is_complete (GstParseGroup * group)
{
GList *l;
gboolean complete = TRUE;
if (!group->no_more_pads) {
complete = FALSE;
goto out;
}
for (l = group->children; l; l = l->next) {
GstParseChain *chain = l->data;
/* Any blocked chain requires we complete this group
* since everything is synchronous, we can't proceed otherwise */
if (chain->endpad && chain->endpad->blocked)
goto out;
if (!gst_parse_chain_is_complete (chain)) {
complete = FALSE;
goto out;
}
}
out:
GST_DEBUG_OBJECT (group->parsebin, "Group %p is complete: %d", group,
complete);
return complete;
}
/* gst_parse_chain_is_complete:
*
* Returns TRUE if the chain is complete, this means either
* a) This chain is a dead end, i.e. we have no suitable plugins
* b) This chain ends in an endpad and this is blocked or exposed
* c) The chain has gotten far enough to have plugged 1 parser at least.
*
* Not MT-safe, always call with ParseBin expose lock
*/
static gboolean
gst_parse_chain_is_complete (GstParseChain * chain)
{
gboolean complete = FALSE;
CHAIN_MUTEX_LOCK (chain);
if (chain->parsebin->shutdown)
goto out;
if (chain->deadend) {
complete = TRUE;
goto out;
}
if (chain->endpad && (chain->endpad->blocked || chain->endpad->exposed)) {
complete = TRUE;
goto out;
}
if (chain->demuxer) {
if (chain->active_group
&& gst_parse_group_is_complete (chain->active_group)) {
complete = TRUE;
goto out;
}
}
if (chain->parsed) {
complete = TRUE;
goto out;
}
out:
CHAIN_MUTEX_UNLOCK (chain);
GST_DEBUG_OBJECT (chain->parsebin, "Chain %p is complete: %d", chain,
complete);
return complete;
}
static void
chain_remove_old_groups (GstParseChain * chain)
{
GList *tmp;
/* First go in child */
if (chain->active_group) {
for (tmp = chain->active_group->children; tmp; tmp = tmp->next) {
GstParseChain *child = (GstParseChain *) tmp->data;
chain_remove_old_groups (child);
}
}
if (chain->old_groups) {
gst_parse_group_hide (chain->old_groups->data);
gst_parse_chain_start_free_hidden_groups_thread (chain);
}
}
static gboolean
drain_and_switch_chains (GstParseChain * chain, GstParsePad * drainpad,
gboolean * last_group, gboolean * drained, gboolean * switched);
/* drain_and_switch_chains/groups:
*
* CALL WITH CHAIN LOCK (or group parent) TAKEN !
*
* Goes down the chains/groups until it finds the chain
* to which the drainpad belongs.
*
* It marks that pad/chain as drained and then will figure
* out which group to switch to or not.
*
* last_chain will be set to TRUE if the group to which the
* pad belongs is the last one.
*
* drained will be set to TRUE if the chain/group is drained.
*
* Returns: TRUE if the chain contained the target pad */
static gboolean
drain_and_switch_group (GstParseGroup * group, GstParsePad * drainpad,
gboolean * last_group, gboolean * drained, gboolean * switched)
{
gboolean handled = FALSE;
GList *tmp;
GST_DEBUG ("Checking group %p (target pad %s:%s)",
group, GST_DEBUG_PAD_NAME (drainpad));
/* Definitely can't be in drained groups */
if (G_UNLIKELY (group->drained)) {
goto beach;
}
/* Figure out if all our chains are drained with the
* new information */
group->drained = TRUE;
for (tmp = group->children; tmp; tmp = tmp->next) {
GstParseChain *chain = (GstParseChain *) tmp->data;
gboolean subdrained = FALSE;
handled |=
drain_and_switch_chains (chain, drainpad, last_group, &subdrained,
switched);
if (!subdrained)
group->drained = FALSE;
}
beach:
GST_DEBUG ("group %p (last_group:%d, drained:%d, switched:%d, handled:%d)",
group, *last_group, group->drained, *switched, handled);
*drained = group->drained;
return handled;
}
static gboolean
drain_and_switch_chains (GstParseChain * chain, GstParsePad * drainpad,
gboolean * last_group, gboolean * drained, gboolean * switched)
{
gboolean handled = FALSE;
GstParseBin *parsebin = chain->parsebin;
GST_DEBUG ("Checking chain %p %s:%s (target pad %s:%s)",
chain, GST_DEBUG_PAD_NAME (chain->pad), GST_DEBUG_PAD_NAME (drainpad));
CHAIN_MUTEX_LOCK (chain);
/* Definitely can't be in drained chains */
if (G_UNLIKELY (chain->drained)) {
goto beach;
}
if (chain->endpad) {
/* Check if we're reached the target endchain */
if (drainpad != NULL && chain == drainpad->chain) {
GST_DEBUG ("Found the target chain");
drainpad->drained = TRUE;
handled = TRUE;
}
chain->drained = chain->endpad->drained;
goto beach;
}
/* We known there are groups to switch to */
if (chain->next_groups)
*last_group = FALSE;
/* Check the active group */
if (chain->active_group) {
gboolean subdrained = FALSE;
handled = drain_and_switch_group (chain->active_group, drainpad,
last_group, &subdrained, switched);
/* The group is drained, see if we can switch to another */
if ((handled || drainpad == NULL) && subdrained && !*switched) {
if (chain->next_groups) {
/* Switch to next group, the actual removal of the current group will
* be done when the next one is activated */
GST_DEBUG_OBJECT (parsebin, "Moving current group %p to old groups",
chain->active_group);
chain->old_groups =
g_list_prepend (chain->old_groups, chain->active_group);
GST_DEBUG_OBJECT (parsebin, "Switching to next group %p",
chain->next_groups->data);
chain->active_group = chain->next_groups->data;
chain->next_groups =
g_list_delete_link (chain->next_groups, chain->next_groups);
*switched = TRUE;
chain->drained = FALSE;
} else {
GST_DEBUG ("Group %p was the last in chain %p", chain->active_group,
chain);
chain->drained = TRUE;
/* We're drained ! */
}
} else {
if (subdrained && !chain->next_groups)
*drained = TRUE;
}
}
beach:
CHAIN_MUTEX_UNLOCK (chain);
GST_DEBUG ("Chain %p (handled:%d, last_group:%d, drained:%d, switched:%d)",
chain, handled, *last_group, chain->drained, *switched);
*drained = chain->drained;
if (*drained)
g_signal_emit (parsebin, gst_parse_bin_signals[SIGNAL_DRAINED], 0, NULL);
return handled;
}
/* check if the group is drained, meaning all pads have seen an EOS
* event. */
static gboolean
gst_parse_pad_handle_eos (GstParsePad * pad)
{
gboolean last_group = TRUE;
gboolean switched = FALSE;
gboolean drained = FALSE;
GstParseChain *chain = pad->chain;
GstParseBin *parsebin = chain->parsebin;
GST_LOG_OBJECT (parsebin, "pad %p", pad);
EXPOSE_LOCK (parsebin);
if (parsebin->parse_chain) {
drain_and_switch_chains (parsebin->parse_chain, pad, &last_group, &drained,
&switched);
if (switched) {
/* If we resulted in a group switch, expose what's needed */
if (gst_parse_chain_is_complete (parsebin->parse_chain))
gst_parse_bin_expose (parsebin);
}
}
EXPOSE_UNLOCK (parsebin);
return last_group;
}
/* gst_parse_group_is_drained:
*
* Check is this group is drained and cache this result.
* The group is drained if all child chains are drained.
*
* Not MT-safe, call with group->parent's lock */
static gboolean
gst_parse_group_is_drained (GstParseGroup * group)
{
GList *l;
gboolean drained = TRUE;
if (group->drained) {
drained = TRUE;
goto out;
}
for (l = group->children; l; l = l->next) {
GstParseChain *chain = l->data;
CHAIN_MUTEX_LOCK (chain);
if (!gst_parse_chain_is_drained (chain))
drained = FALSE;
CHAIN_MUTEX_UNLOCK (chain);
if (!drained)
goto out;
}
group->drained = drained;
out:
GST_DEBUG_OBJECT (group->parsebin, "Group %p is drained: %d", group, drained);
return drained;
}
/* gst_parse_chain_is_drained:
*
* Check is the chain is drained, which means that
* either
*
* a) it's endpad is drained
* b) there are no pending pads, the active group is drained
* and there are no next groups
*
* Not MT-safe, call with chain lock
*/
static gboolean
gst_parse_chain_is_drained (GstParseChain * chain)
{
gboolean drained = FALSE;
if (chain->endpad) {
drained = chain->endpad->drained;
goto out;
}
if (chain->pending_pads) {
drained = FALSE;
goto out;
}
if (chain->active_group && gst_parse_group_is_drained (chain->active_group)
&& !chain->next_groups) {
drained = TRUE;
goto out;
}
out:
GST_DEBUG_OBJECT (chain->parsebin, "Chain %p is drained: %d", chain, drained);
return drained;
}
/* sort_end_pads:
* GCompareFunc to use with lists of GstPad.
* Sorts pads by mime type.
* First video (raw, then non-raw), then audio (raw, then non-raw),
* then others.
*
* Return: negative if a<b, 0 if a==b, positive if a>b
*/
static gint
sort_end_pads (GstParsePad * da, GstParsePad * db)
{
gint va, vb;
GstCaps *capsa, *capsb;
GstStructure *sa, *sb;
const gchar *namea, *nameb;
gchar *ida, *idb;
gint ret;
capsa = get_pad_caps (GST_PAD_CAST (da));
capsb = get_pad_caps (GST_PAD_CAST (db));
sa = gst_caps_get_structure ((const GstCaps *) capsa, 0);
sb = gst_caps_get_structure ((const GstCaps *) capsb, 0);
namea = gst_structure_get_name (sa);
nameb = gst_structure_get_name (sb);
if (g_strrstr (namea, "video/x-raw"))
va = 0;
else if (g_strrstr (namea, "video/"))
va = 1;
else if (g_strrstr (namea, "image/"))
va = 2;
else if (g_strrstr (namea, "audio/x-raw"))
va = 3;
else if (g_strrstr (namea, "audio/"))
va = 4;
else
va = 5;
if (g_strrstr (nameb, "video/x-raw"))
vb = 0;
else if (g_strrstr (nameb, "video/"))
vb = 1;
else if (g_strrstr (nameb, "image/"))
vb = 2;
else if (g_strrstr (nameb, "audio/x-raw"))
vb = 3;
else if (g_strrstr (nameb, "audio/"))
vb = 4;
else
vb = 5;
gst_caps_unref (capsa);
gst_caps_unref (capsb);
if (va != vb)
return va - vb;
/* if otherwise the same, sort by stream-id */
ida = gst_pad_get_stream_id (GST_PAD_CAST (da));
idb = gst_pad_get_stream_id (GST_PAD_CAST (db));
ret = (ida) ? ((idb) ? strcmp (ida, idb) : -1) : 1;
g_free (ida);
g_free (idb);
return ret;
}
static gboolean
debug_sticky_event (GstPad * pad, GstEvent ** event, gpointer user_data)
{
GST_DEBUG_OBJECT (pad, "sticky event %s (%p)", GST_EVENT_TYPE_NAME (*event),
*event);
return TRUE;
}
/* Must only be called if the toplevel chain is complete and blocked! */
/* Not MT-safe, call with ParseBin expose lock! */
static gboolean
gst_parse_bin_expose (GstParseBin * parsebin)
{
GList *tmp, *endpads;
gboolean missing_plugin;
GString *missing_plugin_details;
gboolean already_exposed;
gboolean last_group;
gboolean uncollected_streams;
GstStreamCollection *fallback_collection = NULL;
retry:
endpads = NULL;
missing_plugin = FALSE;
already_exposed = TRUE;
last_group = TRUE;
missing_plugin_details = g_string_new ("");
GST_DEBUG_OBJECT (parsebin, "Exposing currently active chains/groups");
/* Don't expose if we're currently shutting down */
DYN_LOCK (parsebin);
if (G_UNLIKELY (parsebin->shutdown)) {
GST_WARNING_OBJECT (parsebin,
"Currently, shutting down, aborting exposing");
DYN_UNLOCK (parsebin);
return FALSE;
}
DYN_UNLOCK (parsebin);
/* Get the pads that we're going to expose and mark things as exposed */
uncollected_streams = FALSE;
if (!gst_parse_chain_expose (parsebin->parse_chain, &endpads, &missing_plugin,
missing_plugin_details, &last_group, &uncollected_streams)) {
g_list_free_full (endpads, (GDestroyNotify) gst_object_unref);
g_string_free (missing_plugin_details, TRUE);
GST_ERROR_OBJECT (parsebin, "Broken chain/group tree");
g_return_val_if_reached (FALSE);
return FALSE;
}
if (endpads == NULL) {
if (missing_plugin) {
if (missing_plugin_details->len > 0) {
gchar *details = g_string_free (missing_plugin_details, FALSE);
GST_ELEMENT_ERROR (parsebin, CORE, MISSING_PLUGIN, (NULL),
("no suitable plugins found:\n%s", details));
g_free (details);
} else {
g_string_free (missing_plugin_details, TRUE);
GST_ELEMENT_ERROR (parsebin, CORE, MISSING_PLUGIN, (NULL),
("no suitable plugins found"));
}
} else {
/* in this case, the stream ended without buffers,
* just post a warning */
g_string_free (missing_plugin_details, TRUE);
GST_WARNING_OBJECT (parsebin, "All streams finished without buffers. "
"Last group: %d", last_group);
if (last_group) {
GST_ELEMENT_ERROR (parsebin, STREAM, FAILED, (NULL),
("all streams without buffers"));
} else {
gboolean switched = FALSE;
gboolean drained = FALSE;
drain_and_switch_chains (parsebin->parse_chain, NULL, &last_group,
&drained, &switched);
GST_ELEMENT_WARNING (parsebin, STREAM, FAILED, (NULL),
("all streams without buffers"));
if (switched) {
if (gst_parse_chain_is_complete (parsebin->parse_chain))
goto retry;
else
return FALSE;
}
}
}
do_async_done (parsebin);
return FALSE;
}
if (uncollected_streams) {
/* FIXME: Collect and use a stream id from the top chain as
* upstream ID? */
fallback_collection = gst_stream_collection_new (NULL);
build_fallback_collection (parsebin->parse_chain, fallback_collection);
gst_element_post_message (GST_ELEMENT (parsebin),
gst_message_new_stream_collection (GST_OBJECT (parsebin),
fallback_collection));
}
g_string_free (missing_plugin_details, TRUE);
/* Check if this was called when everything was exposed already,
* and see if we need to post a new fallback collection */
for (tmp = endpads; tmp && already_exposed; tmp = tmp->next) {
GstParsePad *parsepad = tmp->data;
already_exposed &= parsepad->exposed;
}
if (already_exposed) {
GST_DEBUG_OBJECT (parsebin, "Everything was exposed already!");
if (fallback_collection)
gst_object_unref (fallback_collection);
g_list_free_full (endpads, (GDestroyNotify) gst_object_unref);
return TRUE;
}
/* Set all already exposed pads to blocked */
for (tmp = endpads; tmp; tmp = tmp->next) {
GstParsePad *parsepad = tmp->data;
if (parsepad->exposed) {
GST_DEBUG_OBJECT (parsepad, "blocking exposed pad");
gst_parse_pad_set_blocked (parsepad, TRUE);
}
}
/* re-order pads : video, then audio, then others */
endpads = g_list_sort (endpads, (GCompareFunc) sort_end_pads);
/* Expose pads */
for (tmp = endpads; tmp; tmp = tmp->next) {
GstParsePad *parsepad = (GstParsePad *) tmp->data;
gchar *padname;
//if (!parsepad->blocked)
//continue;
/* 1. rewrite name */
padname = g_strdup_printf ("src_%u", parsebin->nbpads);
parsebin->nbpads++;
GST_DEBUG_OBJECT (parsebin, "About to expose parsepad %s as %s",
GST_OBJECT_NAME (parsepad), padname);
gst_object_set_name (GST_OBJECT (parsepad), padname);
g_free (padname);
gst_pad_sticky_events_foreach (GST_PAD_CAST (parsepad), debug_sticky_event,
parsepad);
/* 2. activate and add */
if (!parsepad->exposed) {
parsepad->exposed = TRUE;
if (!gst_element_add_pad (GST_ELEMENT (parsebin),
GST_PAD_CAST (parsepad))) {
/* not really fatal, we can try to add the other pads */
g_warning ("error adding pad to ParseBin");
parsepad->exposed = FALSE;
continue;
}
#if 0
/* HACK: Send an empty gap event to push sticky events */
gst_pad_push_event (GST_PAD (parsepad),
gst_event_new_gap (0, GST_CLOCK_TIME_NONE));
#endif
}
GST_INFO_OBJECT (parsepad, "added new parsed pad");
}
/* Unblock internal pads. The application should have connected stuff now
* so that streaming can continue. */
for (tmp = endpads; tmp; tmp = tmp->next) {
GstParsePad *parsepad = (GstParsePad *) tmp->data;
if (parsepad->exposed) {
GST_DEBUG_OBJECT (parsepad, "unblocking");
gst_parse_pad_unblock (parsepad);
GST_DEBUG_OBJECT (parsepad, "unblocked");
}
/* Send stream-collection events for any pads that don't have them,
* and post a stream-collection onto the bus */
if (parsepad->active_collection == NULL && fallback_collection) {
gst_pad_push_event (GST_PAD (parsepad),
gst_event_new_stream_collection (fallback_collection));
}
gst_object_unref (parsepad);
}
g_list_free (endpads);
if (fallback_collection)
gst_object_unref (fallback_collection);
/* Remove old groups */
chain_remove_old_groups (parsebin->parse_chain);
do_async_done (parsebin);
GST_DEBUG_OBJECT (parsebin, "Exposed everything");
return TRUE;
}
/* gst_parse_chain_expose:
*
* Check if the chain can be exposed and add all endpads
* to the endpads list.
*
* Not MT-safe, call with ParseBin expose lock! *
*/
static gboolean
gst_parse_chain_expose (GstParseChain * chain, GList ** endpads,
gboolean * missing_plugin, GString * missing_plugin_details,
gboolean * last_group, gboolean * uncollected_streams)
{
GstParseGroup *group;
GList *l;
gboolean ret = FALSE;
if (chain->deadend) {
if (chain->endcaps) {
if (chain->deadend_details) {
g_string_append (missing_plugin_details, chain->deadend_details);
g_string_append_c (missing_plugin_details, '\n');
} else {
gchar *desc = gst_pb_utils_get_codec_description (chain->endcaps);
gchar *caps_str = gst_caps_to_string (chain->endcaps);
g_string_append_printf (missing_plugin_details,
"Missing parser: %s (%s)\n", desc, caps_str);
g_free (caps_str);
g_free (desc);
}
*missing_plugin = TRUE;
}
return TRUE;
}
if (chain->endpad == NULL && chain->parsed && chain->pending_pads) {
/* The chain has a pending pad from a parser, let's just
* expose that now as the endpad */
GList *cur = chain->pending_pads;
GstPendingPad *ppad = (GstPendingPad *) (cur->data);
GstPad *endpad = gst_object_ref (ppad->pad);
GstElement *elem =
GST_ELEMENT (gst_object_get_parent (GST_OBJECT (endpad)));
chain->pending_pads = g_list_remove (chain->pending_pads, ppad);
gst_pending_pad_free (ppad);
GST_DEBUG_OBJECT (chain->parsebin,
"Exposing pad %" GST_PTR_FORMAT " with incomplete caps "
"because it's parsed", endpad);
expose_pad (chain->parsebin, elem, chain->current_pad, endpad, NULL, chain);
gst_object_unref (endpad);
gst_object_unref (elem);
}
if (chain->endpad) {
GstParsePad *p = chain->endpad;
if (p->active_stream && p->active_collection == NULL
&& !p->in_a_fallback_collection)
*uncollected_streams = TRUE;
*endpads = g_list_prepend (*endpads, gst_object_ref (p));
return TRUE;
}
if (chain->next_groups)
*last_group = FALSE;
group = chain->active_group;
if (!group) {
GstParsePad *p = chain->current_pad;
if (p->active_stream && p->active_collection == NULL
&& !p->in_a_fallback_collection)
*uncollected_streams = TRUE;
return FALSE;
}
for (l = group->children; l; l = l->next) {
GstParseChain *childchain = l->data;
ret |= gst_parse_chain_expose (childchain, endpads, missing_plugin,
missing_plugin_details, last_group, uncollected_streams);
}
return ret;
}
static void
build_fallback_collection (GstParseChain * chain,
GstStreamCollection * collection)
{
GstParseGroup *group = chain->active_group;
GList *l;
/* If it's an end pad, or a not-finished chain that's
* not a group, put it in the collection */
if (chain->endpad || (chain->current_pad && group == NULL)) {
GstParsePad *p = chain->current_pad;
if (p->active_stream != NULL && p->active_collection == NULL) {
GST_DEBUG_OBJECT (p, "Adding stream to fallback collection");
gst_stream_collection_add_stream (collection,
gst_object_ref (p->active_stream));
p->in_a_fallback_collection = TRUE;
}
return;
}
if (!group)
return;
/* we used g_list_prepend when adding children, so iterate from last
* to first to maintain the original order they were added in */
for (l = g_list_last (group->children); l != NULL; l = l->prev) {
GstParseChain *childchain = l->data;
build_fallback_collection (childchain, collection);
}
}
/*************************
* GstParsePad functions
*************************/
static void gst_parse_pad_dispose (GObject * object);
static void
gst_parse_pad_class_init (GstParsePadClass * klass)
{
GObjectClass *gobject_klass;
gobject_klass = (GObjectClass *) klass;
gobject_klass->dispose = gst_parse_pad_dispose;
}
static void
gst_parse_pad_init (GstParsePad * pad)
{
pad->chain = NULL;
pad->blocked = FALSE;
pad->exposed = FALSE;
pad->drained = FALSE;
gst_object_ref_sink (pad);
}
static void
gst_parse_pad_dispose (GObject * object)
{
GstParsePad *parsepad = (GstParsePad *) (object);
parse_pad_set_target (parsepad, NULL);
gst_object_replace ((GstObject **) & parsepad->active_collection, NULL);
gst_object_replace ((GstObject **) & parsepad->active_stream, NULL);
G_OBJECT_CLASS (gst_parse_pad_parent_class)->dispose (object);
}
static GstPadProbeReturn
source_pad_blocked_cb (GstPad * pad, GstPadProbeInfo * info, gpointer user_data)
{
GstParsePad *parsepad = user_data;
GstParseChain *chain;
GstParseBin *parsebin;
GstPadProbeReturn ret = GST_PAD_PROBE_OK;
if (GST_PAD_PROBE_INFO_TYPE (info) & GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM) {
GstEvent *event = GST_PAD_PROBE_INFO_EVENT (info);
GST_LOG_OBJECT (pad, "Seeing event '%s'", GST_EVENT_TYPE_NAME (event));
if (!GST_EVENT_IS_SERIALIZED (event)) {
/* do not block on sticky or out of band events otherwise the allocation query
from demuxer might block the loop thread */
GST_LOG_OBJECT (pad, "Letting OOB event through");
return GST_PAD_PROBE_PASS;
}
if (GST_EVENT_IS_STICKY (event) && GST_EVENT_TYPE (event) != GST_EVENT_EOS) {
GstPad *peer;
/* manually push sticky events to ghost pad to avoid exposing pads
* that don't have the sticky events. Handle EOS separately as we
* want to block the pad on it if we didn't get any buffers before
* EOS and expose the pad then. */
peer = gst_pad_get_peer (pad);
gst_pad_send_event (peer, event);
gst_object_unref (peer);
GST_LOG_OBJECT (pad, "Manually pushed sticky event through");
ret = GST_PAD_PROBE_HANDLED;
goto done;
}
} else if (GST_PAD_PROBE_INFO_TYPE (info) &
GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM) {
GstQuery *query = GST_PAD_PROBE_INFO_QUERY (info);
if (!GST_QUERY_IS_SERIALIZED (query)) {
/* do not block on non-serialized queries */
GST_LOG_OBJECT (pad, "Letting non-serialized query through");
return GST_PAD_PROBE_PASS;
}
if (!gst_pad_has_current_caps (pad)) {
/* do not block on allocation queries before we have caps,
* this would deadlock because we are doing no autoplugging
* without caps.
* TODO: Try to do autoplugging based on the query caps
*/
GST_LOG_OBJECT (pad, "Letting serialized query before caps through");
return GST_PAD_PROBE_PASS;
}
}
chain = parsepad->chain;
parsebin = chain->parsebin;
GST_LOG_OBJECT (parsepad, "blocked: parsepad->chain:%p", chain);
parsepad->blocked = TRUE;
EXPOSE_LOCK (parsebin);
if (parsebin->parse_chain) {
if (!gst_parse_bin_expose (parsebin))
GST_WARNING_OBJECT (parsebin, "Couldn't expose group");
}
EXPOSE_UNLOCK (parsebin);
done:
return ret;
}
/* FIXME: We can probably do some cleverer things, and maybe move this into
* pbutils. Ideas:
* if there are tags look if it's got an AUDIO_CODEC VIDEO_CODEC CONTAINER_FORMAT tag
* Look at the factory klass designation of parsers in the chain
* Consider demuxer pad names as well, sometimes they give the type away
*/
static GstStreamType
guess_stream_type_from_caps (GstCaps * caps)
{
GstStructure *s;
const gchar *name;
if (gst_caps_get_size (caps) < 1)
return GST_STREAM_TYPE_UNKNOWN;
s = gst_caps_get_structure (caps, 0);
name = gst_structure_get_name (s);
if (g_str_has_prefix (name, "video/") || g_str_has_prefix (name, "image/"))
return GST_STREAM_TYPE_VIDEO;
if (g_str_has_prefix (name, "audio/"))
return GST_STREAM_TYPE_AUDIO;
if (g_str_has_prefix (name, "text/") ||
g_str_has_prefix (name, "subpicture/"))
return GST_STREAM_TYPE_TEXT;
return GST_STREAM_TYPE_UNKNOWN;
}
static void
gst_parse_pad_update_caps (GstParsePad * parsepad, GstCaps * caps)
{
if (caps && parsepad->active_stream) {
GST_DEBUG_OBJECT (parsepad, "Storing caps %" GST_PTR_FORMAT
" on stream %" GST_PTR_FORMAT, caps, parsepad->active_stream);
if (gst_caps_is_fixed (caps))
gst_stream_set_caps (parsepad->active_stream, caps);
/* intuit a type */
if (gst_stream_get_stream_type (parsepad->active_stream) ==
GST_STREAM_TYPE_UNKNOWN) {
GstStreamType new_type = guess_stream_type_from_caps (caps);
if (new_type != GST_STREAM_TYPE_UNKNOWN)
gst_stream_set_stream_type (parsepad->active_stream, new_type);
}
}
}
static void
gst_parse_pad_update_tags (GstParsePad * parsepad, GstTagList * tags)
{
if (tags && gst_tag_list_get_scope (tags) == GST_TAG_SCOPE_STREAM
&& parsepad->active_stream) {
GST_DEBUG_OBJECT (parsepad,
"Storing new tags %" GST_PTR_FORMAT " on stream %" GST_PTR_FORMAT, tags,
parsepad->active_stream);
gst_stream_set_tags (parsepad->active_stream, tags);
}
}
static GstEvent *
gst_parse_pad_stream_start_event (GstParsePad * parsepad, GstEvent * event)
{
GstStream *stream = NULL;
const gchar *stream_id = NULL;
gboolean repeat_event = FALSE;
gst_event_parse_stream_start (event, &stream_id);
if (parsepad->active_stream != NULL &&
g_str_equal (parsepad->active_stream->stream_id, stream_id))
repeat_event = TRUE;
else {
/* A new stream requires a new collection event, or else
* we'll place it in a fallback collection later */
gst_object_replace ((GstObject **) & parsepad->active_collection, NULL);
parsepad->in_a_fallback_collection = FALSE;
}
gst_event_parse_stream (event, &stream);
if (stream == NULL) {
GstCaps *caps = gst_pad_get_current_caps (GST_PAD_CAST (parsepad));
if (caps == NULL) {
/* Try and get caps from the parsepad peer */
GstPad *peer = gst_ghost_pad_get_target (GST_GHOST_PAD (parsepad));
caps = gst_pad_get_current_caps (peer);
gst_object_unref (peer);
}
if (caps == NULL && parsepad->chain && parsepad->chain->start_caps) {
/* Still no caps, use the chain start caps */
caps = gst_caps_ref (parsepad->chain->start_caps);
}
GST_DEBUG_OBJECT (parsepad,
"Saw stream_start with no GstStream. Adding one. Caps %"
GST_PTR_FORMAT, caps);
if (repeat_event) {
stream = gst_object_ref (parsepad->active_stream);
} else {
stream =
gst_stream_new (stream_id, NULL, GST_STREAM_TYPE_UNKNOWN,
GST_STREAM_FLAG_NONE);
gst_object_replace ((GstObject **) & parsepad->active_stream,
(GstObject *) stream);
}
if (caps) {
gst_parse_pad_update_caps (parsepad, caps);
gst_caps_unref (caps);
}
event = gst_event_make_writable (event);
gst_event_set_stream (event, stream);
}
gst_object_unref (stream);
GST_LOG_OBJECT (parsepad, "Saw stream %s (GstStream %p)",
stream->stream_id, stream);
return event;
}
static void
gst_parse_pad_update_stream_collection (GstParsePad * parsepad,
GstStreamCollection * collection)
{
GST_LOG_OBJECT (parsepad, "Got new stream collection %p", collection);
gst_object_replace ((GstObject **) & parsepad->active_collection,
(GstObject *) collection);
parsepad->in_a_fallback_collection = FALSE;
}
static GstPadProbeReturn
gst_parse_pad_event (GstPad * pad, GstPadProbeInfo * info, gpointer user_data)
{
GstEvent *event = GST_PAD_PROBE_INFO_EVENT (info);
GstObject *parent = gst_pad_get_parent (pad);
GstParsePad *parsepad = GST_PARSE_PAD (parent);
gboolean forwardit = TRUE;
GST_LOG_OBJECT (pad, "%s parsepad:%p", GST_EVENT_TYPE_NAME (event), parsepad);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:{
GstCaps *caps = NULL;
gst_event_parse_caps (event, &caps);
gst_parse_pad_update_caps (parsepad, caps);
break;
}
case GST_EVENT_TAG:{
GstTagList *tags;
gst_event_parse_tag (event, &tags);
gst_parse_pad_update_tags (parsepad, tags);
break;
}
case GST_EVENT_STREAM_START:{
GST_PAD_PROBE_INFO_DATA (info) =
gst_parse_pad_stream_start_event (parsepad, event);
break;
}
case GST_EVENT_STREAM_COLLECTION:{
GstStreamCollection *collection = NULL;
gst_event_parse_stream_collection (event, &collection);
gst_parse_pad_update_stream_collection (parsepad, collection);
break;
}
case GST_EVENT_EOS:{
GST_DEBUG_OBJECT (pad, "we received EOS");
/* Check if all pads are drained.
* * If there is no next group, we will let the EOS go through.
* * If there is a next group but the current group isn't completely
* drained, we will drop the EOS event.
* * If there is a next group to expose and this was the last non-drained
* pad for that group, we will remove the ghostpad of the current group
* first, which unlinks the peer and so drops the EOS. */
forwardit = gst_parse_pad_handle_eos (parsepad);
}
default:
break;
}
gst_object_unref (parent);
if (forwardit)
return GST_PAD_PROBE_OK;
else
return GST_PAD_PROBE_DROP;
}
static void
gst_parse_pad_set_blocked (GstParsePad * parsepad, gboolean blocked)
{
GstParseBin *parsebin = parsepad->parsebin;
GstPad *opad;
DYN_LOCK (parsebin);
GST_DEBUG_OBJECT (parsepad, "blocking pad: %d", blocked);
opad = gst_ghost_pad_get_target (GST_GHOST_PAD_CAST (parsepad));
if (!opad)
goto out;
/* do not block if shutting down.
* we do not consider/expect it blocked further below, but use other trick */
if (!blocked || !parsebin->shutdown) {
if (blocked) {
if (parsepad->block_id == 0)
parsepad->block_id =
gst_pad_add_probe (opad,
GST_PAD_PROBE_TYPE_BLOCK_DOWNSTREAM |
GST_PAD_PROBE_TYPE_QUERY_DOWNSTREAM, source_pad_blocked_cb,
gst_object_ref (parsepad), (GDestroyNotify) gst_object_unref);
} else {
if (parsepad->block_id != 0) {
gst_pad_remove_probe (opad, parsepad->block_id);
parsepad->block_id = 0;
}
parsepad->blocked = FALSE;
}
}
if (blocked) {
if (parsebin->shutdown) {
/* deactivate to force flushing state to prevent NOT_LINKED errors */
gst_pad_set_active (GST_PAD_CAST (parsepad), FALSE);
/* note that deactivating the target pad would have no effect here,
* since elements are typically connected first (and pads exposed),
* and only then brought to PAUSED state (so pads activated) */
} else {
gst_object_ref (parsepad);
parsebin->blocked_pads =
g_list_prepend (parsebin->blocked_pads, parsepad);
}
} else {
GList *l;
if ((l = g_list_find (parsebin->blocked_pads, parsepad))) {
gst_object_unref (parsepad);
parsebin->blocked_pads = g_list_delete_link (parsebin->blocked_pads, l);
}
}
gst_object_unref (opad);
out:
DYN_UNLOCK (parsebin);
}
static void
gst_parse_pad_activate (GstParsePad * parsepad, GstParseChain * chain)
{
g_return_if_fail (chain != NULL);
parsepad->chain = chain;
gst_pad_set_active (GST_PAD_CAST (parsepad), TRUE);
gst_parse_pad_set_blocked (parsepad, TRUE);
}
static void
gst_parse_pad_unblock (GstParsePad * parsepad)
{
gst_parse_pad_set_blocked (parsepad, FALSE);
}
static gboolean
gst_parse_pad_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstParsePad *parsepad = GST_PARSE_PAD (parent);
gboolean ret = FALSE;
CHAIN_MUTEX_LOCK (parsepad->chain);
if (!parsepad->exposed && !parsepad->parsebin->shutdown
&& !parsepad->chain->deadend && parsepad->chain->elements) {
GstParseElement *pelem = parsepad->chain->elements->data;
ret = FALSE;
GST_DEBUG_OBJECT (parsepad->parsebin,
"calling autoplug-query for %s (element %s): %" GST_PTR_FORMAT,
GST_PAD_NAME (parsepad), GST_ELEMENT_NAME (pelem->element), query);
g_signal_emit (G_OBJECT (parsepad->parsebin),
gst_parse_bin_signals[SIGNAL_AUTOPLUG_QUERY], 0, parsepad,
pelem->element, query, &ret);
if (ret)
GST_DEBUG_OBJECT (parsepad->parsebin,
"autoplug-query returned %d: %" GST_PTR_FORMAT, ret, query);
else
GST_DEBUG_OBJECT (parsepad->parsebin, "autoplug-query returned %d", ret);
}
CHAIN_MUTEX_UNLOCK (parsepad->chain);
/* If exposed or nothing handled the query use the default handler */
if (!ret)
ret = gst_pad_query_default (pad, parent, query);
return ret;
}
/*gst_parse_pad_new:
*
* Creates a new GstParsePad for the given pad.
*/
static GstParsePad *
gst_parse_pad_new (GstParseBin * parsebin, GstParseChain * chain)
{
GstParsePad *parsepad;
GstProxyPad *ppad;
GstPadTemplate *pad_tmpl;
GST_DEBUG_OBJECT (parsebin, "making new parsepad");
pad_tmpl = gst_static_pad_template_get (&parse_bin_src_template);
parsepad =
g_object_new (GST_TYPE_PARSE_PAD, "direction", GST_PAD_SRC,
"template", pad_tmpl, NULL);
gst_ghost_pad_construct (GST_GHOST_PAD_CAST (parsepad));
parsepad->chain = chain;
parsepad->parsebin = parsebin;
gst_object_unref (pad_tmpl);
ppad = gst_proxy_pad_get_internal (GST_PROXY_PAD (parsepad));
gst_pad_set_query_function (GST_PAD_CAST (ppad), gst_parse_pad_query);
/* Add downstream event probe */
GST_LOG_OBJECT (parsepad, "Adding event probe on internal pad %"
GST_PTR_FORMAT, ppad);
gst_pad_add_probe (GST_PAD_CAST (ppad),
GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM, gst_parse_pad_event, parsepad, NULL);
gst_object_unref (ppad);
return parsepad;
}
static void
gst_pending_pad_free (GstPendingPad * ppad)
{
g_assert (ppad);
g_assert (ppad->pad);
if (ppad->event_probe_id != 0)
gst_pad_remove_probe (ppad->pad, ppad->event_probe_id);
if (ppad->notify_caps_id)
g_signal_handler_disconnect (ppad->pad, ppad->notify_caps_id);
gst_object_unref (ppad->pad);
g_slice_free (GstPendingPad, ppad);
}
/*****
* Element add/remove
*****/
static void
do_async_start (GstParseBin * parsebin)
{
GstMessage *message;
parsebin->async_pending = TRUE;
message = gst_message_new_async_start (GST_OBJECT_CAST (parsebin));
parent_class->handle_message (GST_BIN_CAST (parsebin), message);
}
static void
do_async_done (GstParseBin * parsebin)
{
GstMessage *message;
if (parsebin->async_pending) {
message =
gst_message_new_async_done (GST_OBJECT_CAST (parsebin),
GST_CLOCK_TIME_NONE);
parent_class->handle_message (GST_BIN_CAST (parsebin), message);
parsebin->async_pending = FALSE;
}
}
/* call with dyn_lock held */
static void
unblock_pads (GstParseBin * parsebin)
{
GList *tmp;
GST_LOG_OBJECT (parsebin, "unblocking pads");
for (tmp = parsebin->blocked_pads; tmp; tmp = tmp->next) {
GstParsePad *parsepad = (GstParsePad *) tmp->data;
GstPad *opad;
opad = gst_ghost_pad_get_target (GST_GHOST_PAD_CAST (parsepad));
if (!opad)
continue;
GST_DEBUG_OBJECT (parsepad, "unblocking");
if (parsepad->block_id != 0) {
gst_pad_remove_probe (opad, parsepad->block_id);
parsepad->block_id = 0;
}
parsepad->blocked = FALSE;
/* make flushing, prevent NOT_LINKED */
gst_pad_set_active (GST_PAD_CAST (parsepad), FALSE);
gst_object_unref (parsepad);
gst_object_unref (opad);
GST_DEBUG_OBJECT (parsepad, "unblocked");
}
/* clear, no more blocked pads */
g_list_free (parsebin->blocked_pads);
parsebin->blocked_pads = NULL;
}
static GstStateChangeReturn
gst_parse_bin_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GstParseBin *parsebin = GST_PARSE_BIN (element);
GstParseChain *chain_to_free = NULL;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
if (parsebin->typefind == NULL)
goto missing_typefind;
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
/* Make sure we've cleared all existing chains */
EXPOSE_LOCK (parsebin);
if (parsebin->parse_chain) {
gst_parse_chain_free (parsebin->parse_chain);
parsebin->parse_chain = NULL;
}
EXPOSE_UNLOCK (parsebin);
DYN_LOCK (parsebin);
GST_LOG_OBJECT (parsebin, "clearing shutdown flag");
parsebin->shutdown = FALSE;
DYN_UNLOCK (parsebin);
parsebin->have_type = FALSE;
ret = GST_STATE_CHANGE_ASYNC;
do_async_start (parsebin);
/* connect a signal to find out when the typefind element found
* a type */
parsebin->have_type_id =
g_signal_connect (parsebin->typefind, "have-type",
G_CALLBACK (type_found), parsebin);
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
if (parsebin->have_type_id)
g_signal_handler_disconnect (parsebin->typefind,
parsebin->have_type_id);
parsebin->have_type_id = 0;
DYN_LOCK (parsebin);
GST_LOG_OBJECT (parsebin, "setting shutdown flag");
parsebin->shutdown = TRUE;
unblock_pads (parsebin);
DYN_UNLOCK (parsebin);
default:
break;
}
{
GstStateChangeReturn bret;
bret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (G_UNLIKELY (bret == GST_STATE_CHANGE_FAILURE))
goto activate_failed;
else if (G_UNLIKELY (bret == GST_STATE_CHANGE_NO_PREROLL)) {
do_async_done (parsebin);
ret = bret;
}
}
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
do_async_done (parsebin);
EXPOSE_LOCK (parsebin);
if (parsebin->parse_chain) {
chain_to_free = parsebin->parse_chain;
gst_parse_chain_free_internal (parsebin->parse_chain, TRUE);
parsebin->parse_chain = NULL;
}
EXPOSE_UNLOCK (parsebin);
if (chain_to_free)
gst_parse_chain_free (chain_to_free);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
default:
break;
}
return ret;
/* ERRORS */
missing_typefind:
{
gst_element_post_message (element,
gst_missing_element_message_new (element, "typefind"));
GST_ELEMENT_ERROR (parsebin, CORE, MISSING_PLUGIN, (NULL),
("no typefind!"));
return GST_STATE_CHANGE_FAILURE;
}
activate_failed:
{
GST_DEBUG_OBJECT (element,
"element failed to change states -- activation problem?");
do_async_done (parsebin);
return GST_STATE_CHANGE_FAILURE;
}
}
static void
gst_parse_bin_handle_message (GstBin * bin, GstMessage * msg)
{
GstParseBin *parsebin = GST_PARSE_BIN (bin);
gboolean drop = FALSE;
switch (GST_MESSAGE_TYPE (msg)) {
case GST_MESSAGE_ERROR:{
/* Don't pass errors when shutting down. Sometimes,
* elements can generate spurious errors because we set the
* output pads to flushing, and they can't detect that if they
* send an event at exactly the wrong moment */
DYN_LOCK (parsebin);
drop = parsebin->shutdown;
DYN_UNLOCK (parsebin);
if (!drop) {
GST_OBJECT_LOCK (parsebin);
drop =
(g_list_find (parsebin->filtered, GST_MESSAGE_SRC (msg)) != NULL);
if (drop)
parsebin->filtered_errors =
g_list_prepend (parsebin->filtered_errors, gst_message_ref (msg));
GST_OBJECT_UNLOCK (parsebin);
}
break;
}
default:
break;
}
if (drop)
gst_message_unref (msg);
else
GST_BIN_CLASS (parent_class)->handle_message (bin, msg);
}
gboolean
gst_parse_bin_plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_parse_bin_debug, "parsebin", 0, "parser bin");
return gst_element_register (plugin, "parsebin", GST_RANK_NONE,
GST_TYPE_PARSE_BIN);
}
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