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gstreamer/gst/playback/gstdecodebin.c
Stefan Kost 16e2bccc61 gst/playback/: Add basic docs to decodebin and link to decodebin from decodebin2. 
Original commit message from CVS:
* gst/playback/gstdecodebin.c:
* gst/playback/gstdecodebin2.c:
Add basic docs to decodebin and link to decodebin from decodebin2.
2008-12-08 15:25:13 +00:00

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/* GStreamer
* Copyright (C) <2004> Wim Taymans <wim.taymans@gmail.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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-decodebin
*
* #GstBin that auto-magically constructs a decoding pipeline using available
* decoders and demuxers via auto-plugging.
*
* When using decodebin in your application, connect a signal handler to
* #GstDecodeBin::new-decoded-pad and connect your sinks from within the
* callback function.
*/
#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-marshal.h"
/* generic templates */
static GstStaticPadTemplate decoder_bin_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
static GstStaticPadTemplate decoder_bin_src_template =
GST_STATIC_PAD_TEMPLATE ("src%d",
GST_PAD_SRC,
GST_PAD_SOMETIMES,
GST_STATIC_CAPS_ANY);
GST_DEBUG_CATEGORY_STATIC (gst_decode_bin_debug);
#define GST_CAT_DEFAULT gst_decode_bin_debug
#define GST_TYPE_DECODE_BIN (gst_decode_bin_get_type())
#define GST_DECODE_BIN(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_DECODE_BIN,GstDecodeBin))
#define GST_DECODE_BIN_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_DECODE_BIN,GstDecodeBinClass))
#define GST_IS_DECODE_BIN(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_DECODE_BIN))
#define GST_IS_DECODE_BIN_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_DECODE_BIN))
typedef struct _GstDecodeBin GstDecodeBin;
typedef struct _GstDecodeBinClass GstDecodeBinClass;
/**
* GstDecodeBin:
*
* Auto-plugging decoder element structure
*/
struct _GstDecodeBin
{
GstBin bin; /* we extend GstBin */
GstElement *typefind; /* this holds the typefind object */
GstElement *fakesink;
GList *dynamics; /* list of dynamic connections */
GList *queues; /* list of demuxer-decoder queues */
GList *probes; /* list of PadProbeData */
GList *factories; /* factories we can use for selecting elements */
gint numpads;
gint numwaiting;
gboolean have_type;
guint have_type_id; /* signal id for the typefind element */
gboolean shutting_down; /* stop pluggin if we're shutting down */
GType queue_type; /* store the GType of queues, to aid in recognising them */
GMutex *cb_mutex; /* Mutex for multi-threaded callbacks, such as removing the fakesink */
};
struct _GstDecodeBinClass
{
GstBinClass parent_class;
/* signal we fire when a new pad has been decoded into raw audio/video */
void (*new_decoded_pad) (GstElement * element, GstPad * pad, gboolean last);
/* signal we fire when a pad has been removed */
void (*removed_decoded_pad) (GstElement * element, GstPad * pad);
/* signal fired when we found a pad that we cannot decode */
void (*unknown_type) (GstElement * element, GstPad * pad, GstCaps * caps);
};
/* signals */
enum
{
SIGNAL_NEW_DECODED_PAD,
SIGNAL_REMOVED_DECODED_PAD,
SIGNAL_UNKNOWN_TYPE,
SIGNAL_REDIRECT,
LAST_SIGNAL
};
/* Properties */
enum
{
PROP_0,
PROP_SINK_CAPS,
};
typedef struct
{
GstPad *pad;
gulong sigid;
gboolean done;
} PadProbeData;
/* this structure is created for all dynamic pads that could get created
* at runtime */
typedef struct
{
GstDecodeBin *decode_bin; /* pointer to ourself */
GstElement *element; /* the element sending the signal */
gint np_sig_id; /* signal id of new_pad */
gint nmp_sig_id; /* signal id of no_more_pads */
GstPad *pad; /* the pad sending the signal */
gint caps_sig_id; /* signal id of caps */
}
GstDynamic;
static void gst_decode_bin_class_init (GstDecodeBinClass * klass);
static void gst_decode_bin_init (GstDecodeBin * decode_bin);
static void gst_decode_bin_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_decode_bin_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_decode_bin_dispose (GObject * object);
static void gst_decode_bin_finalize (GObject * object);
static GstStateChangeReturn gst_decode_bin_change_state (GstElement * element,
GstStateChange transition);
static gboolean add_fakesink (GstDecodeBin * decode_bin);
static void remove_fakesink (GstDecodeBin * decode_bin);
static void dynamic_free (GstDynamic * dyn);
static void free_dynamics (GstDecodeBin * decode_bin);
static void type_found (GstElement * typefind, guint probability,
GstCaps * caps, GstDecodeBin * decode_bin);
static GstElement *try_to_link_1 (GstDecodeBin * decode_bin,
GstElement * origelement, GstPad * pad, GList * factories);
static void close_link (GstElement * element, GstDecodeBin * decode_bin);
static void close_pad_link (GstElement * element, GstPad * pad,
GstCaps * caps, GstDecodeBin * decode_bin, gboolean more);
static void unlinked (GstPad * pad, GstPad * peerpad,
GstDecodeBin * decode_bin);
static void new_pad (GstElement * element, GstPad * pad, GstDynamic * dynamic);
static void no_more_pads (GstElement * element, GstDynamic * dynamic);
static void new_caps (GstPad * pad, GParamSpec * unused, GstDynamic * dynamic);
static void queue_filled_cb (GstElement * queue, GstDecodeBin * decode_bin);
static void queue_underrun_cb (GstElement * queue, GstDecodeBin * decode_bin);
static gboolean is_demuxer_element (GstElement * srcelement);
static GstElementClass *parent_class;
static guint gst_decode_bin_signals[LAST_SIGNAL] = { 0 };
static const GstElementDetails gst_decode_bin_details =
GST_ELEMENT_DETAILS ("Decoder Bin",
"Generic/Bin/Decoder",
"Autoplug and decode to raw media",
"Wim Taymans <wim.taymans@gmail.com>");
static GType
gst_decode_bin_get_type (void)
{
static GType gst_decode_bin_type = 0;
if (!gst_decode_bin_type) {
static const GTypeInfo gst_decode_bin_info = {
sizeof (GstDecodeBinClass),
NULL,
NULL,
(GClassInitFunc) gst_decode_bin_class_init,
NULL,
NULL,
sizeof (GstDecodeBin),
0,
(GInstanceInitFunc) gst_decode_bin_init,
NULL
};
gst_decode_bin_type =
g_type_register_static (GST_TYPE_BIN, "GstDecodeBin",
&gst_decode_bin_info, 0);
}
return gst_decode_bin_type;
}
static void
gst_decode_bin_class_init (GstDecodeBinClass * 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->set_property = GST_DEBUG_FUNCPTR (gst_decode_bin_set_property);
gobject_klass->get_property = GST_DEBUG_FUNCPTR (gst_decode_bin_get_property);
gobject_klass->dispose = GST_DEBUG_FUNCPTR (gst_decode_bin_dispose);
gobject_klass->finalize = GST_DEBUG_FUNCPTR (gst_decode_bin_finalize);
/**
* GstDecodeBin::new-decoded-pad:
* @bin: The decodebin
* @pad: The newly created pad
* @islast: #TRUE if this is the last pad to be added. Deprecated.
*
* This signal gets emitted as soon as a new pad of the same type as one of
* the valid 'raw' types is added.
*/
gst_decode_bin_signals[SIGNAL_NEW_DECODED_PAD] =
g_signal_new ("new-decoded-pad", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstDecodeBinClass, new_decoded_pad), NULL, NULL,
gst_play_marshal_VOID__OBJECT_BOOLEAN, G_TYPE_NONE, 2, GST_TYPE_PAD,
G_TYPE_BOOLEAN);
/**
* GstDecodeBin::removed-decoded-pad:
* @bin: The decodebin
* @pad: The pad that was removed
*
* This signal is emitted when a 'final' caps pad has been removed.
*/
gst_decode_bin_signals[SIGNAL_REMOVED_DECODED_PAD] =
g_signal_new ("removed-decoded-pad", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstDecodeBinClass, removed_decoded_pad), NULL, NULL,
gst_marshal_VOID__OBJECT, G_TYPE_NONE, 1, GST_TYPE_PAD);
/**
* GstDecodeBin::unknown-type:
* @bin: The decodebin
* @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
* decoding is added to the decodebin.
*/
gst_decode_bin_signals[SIGNAL_UNKNOWN_TYPE] =
g_signal_new ("unknown-type", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDecodeBinClass, unknown_type),
NULL, NULL, gst_marshal_VOID__OBJECT_BOXED, G_TYPE_NONE, 2,
GST_TYPE_PAD, GST_TYPE_CAPS);
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));
gst_element_class_add_pad_template (gstelement_klass,
gst_static_pad_template_get (&decoder_bin_sink_template));
gst_element_class_add_pad_template (gstelement_klass,
gst_static_pad_template_get (&decoder_bin_src_template));
gst_element_class_set_details (gstelement_klass, &gst_decode_bin_details);
gstelement_klass->change_state =
GST_DEBUG_FUNCPTR (gst_decode_bin_change_state);
}
/* check if the bin is dynamic.
*
* If there are no outstanding dynamic connections, the bin is
* considered to be non-dynamic.
*/
static gboolean
gst_decode_bin_is_dynamic (GstDecodeBin * decode_bin)
{
return decode_bin->dynamics != NULL;
}
/* the filter function for selecting the elements we can use in
* autoplugging */
static gboolean
gst_decode_bin_factory_filter (GstPluginFeature * feature,
GstDecodeBin * decode_bin)
{
guint rank;
const gchar *klass;
/* we only care about element factories */
if (!GST_IS_ELEMENT_FACTORY (feature))
return FALSE;
klass = gst_element_factory_get_klass (GST_ELEMENT_FACTORY (feature));
/* only demuxers, decoders and parsers can play */
if (strstr (klass, "Demux") == NULL &&
strstr (klass, "Decoder") == NULL && strstr (klass, "Parse") == NULL &&
strstr (klass, "Depayloader") == NULL) {
return FALSE;
}
/* only select elements with autoplugging rank */
rank = gst_plugin_feature_get_rank (feature);
if (rank < GST_RANK_MARGINAL)
return FALSE;
return TRUE;
}
/* function used to sort element features */
static gint
compare_ranks (GstPluginFeature * f1, GstPluginFeature * f2)
{
gint diff;
const gchar *rname1, *rname2;
diff = gst_plugin_feature_get_rank (f2) - gst_plugin_feature_get_rank (f1);
if (diff != 0)
return diff;
rname1 = gst_plugin_feature_get_name (f1);
rname2 = gst_plugin_feature_get_name (f2);
diff = strcmp (rname2, rname1);
return diff;
}
static void
print_feature (GstPluginFeature * feature)
{
const gchar *rname;
rname = gst_plugin_feature_get_name (feature);
GST_DEBUG ("%s", rname);
}
static void
gst_decode_bin_init (GstDecodeBin * decode_bin)
{
GList *factories;
decode_bin->cb_mutex = g_mutex_new ();
/* first filter out the interesting element factories */
factories = gst_default_registry_feature_filter (
(GstPluginFeatureFilter) gst_decode_bin_factory_filter,
FALSE, decode_bin);
/* sort them according to their ranks */
decode_bin->factories = g_list_sort (factories, (GCompareFunc) compare_ranks);
/* do some debugging */
g_list_foreach (decode_bin->factories, (GFunc) print_feature, NULL);
/* we create the typefind element only once */
decode_bin->typefind = gst_element_factory_make ("typefind", "typefind");
if (!decode_bin->typefind) {
g_warning ("can't find typefind element, decodebin will not work");
} else {
GstPad *pad, *gpad;
/* add the typefind element */
if (!gst_bin_add (GST_BIN (decode_bin), decode_bin->typefind)) {
g_warning ("Could not add typefind element, decodebin will not work");
gst_object_unref (decode_bin->typefind);
decode_bin->typefind = NULL;
}
/* get the sinkpad */
pad = gst_element_get_static_pad (decode_bin->typefind, "sink");
/* ghost the sink pad to ourself */
gpad = gst_ghost_pad_new ("sink", pad);
gst_pad_set_active (gpad, TRUE);
gst_element_add_pad (GST_ELEMENT (decode_bin), gpad);
gst_object_unref (pad);
/* connect a signal to find out when the typefind element found
* a type */
decode_bin->have_type_id =
g_signal_connect (G_OBJECT (decode_bin->typefind), "have_type",
G_CALLBACK (type_found), decode_bin);
}
add_fakesink (decode_bin);
decode_bin->dynamics = NULL;
decode_bin->queues = NULL;
decode_bin->probes = NULL;
}
static void
gst_decode_bin_dispose (GObject * object)
{
GstDecodeBin *decode_bin;
decode_bin = GST_DECODE_BIN (object);
if (decode_bin->factories)
gst_plugin_feature_list_free (decode_bin->factories);
decode_bin->factories = NULL;
G_OBJECT_CLASS (parent_class)->dispose (object);
/* our parent dispose might trigger new signals when pads are unlinked
* etc. clean up the mess here. */
/* FIXME do proper cleanup when going to NULL */
free_dynamics (decode_bin);
}
static void
gst_decode_bin_set_sink_caps (GstDecodeBin * dbin, GstCaps * caps)
{
GST_DEBUG_OBJECT (dbin, "Setting new caps: %" GST_PTR_FORMAT, caps);
g_object_set (dbin->typefind, "force-caps", caps, NULL);
}
static GstCaps *
gst_decode_bin_get_sink_caps (GstDecodeBin * dbin)
{
GstCaps *caps;
GST_DEBUG_OBJECT (dbin, "Getting currently set caps");
g_object_get (dbin->typefind, "force-caps", &caps, NULL);
return caps;
}
static void
gst_decode_bin_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstDecodeBin *dbin;
dbin = GST_DECODE_BIN (object);
switch (prop_id) {
case PROP_SINK_CAPS:
gst_decode_bin_set_sink_caps (dbin, g_value_get_boxed (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_decode_bin_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstDecodeBin *dbin;
dbin = GST_DECODE_BIN (object);
switch (prop_id) {
case PROP_SINK_CAPS:
g_value_take_boxed (value, gst_decode_bin_get_sink_caps (dbin));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_decode_bin_finalize (GObject * object)
{
GstDecodeBin *decode_bin = GST_DECODE_BIN (object);
g_mutex_free (decode_bin->cb_mutex);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
struct DynFind
{
GstElement *elem;
GstPad *pad;
};
static gint
find_dynamic (GstDynamic * dyn, struct DynFind *info)
{
if (dyn->element == info->elem && dyn->pad == info->pad)
return 0;
return 1;
}
/* Add either an element (for dynamic pads/pad-added watching) or a
* pad (for delayed caps/notify::caps watching) to the dynamic list,
* taking care to ignore repeat entries so we don't end up handling a
* pad twice, for example */
static void
dynamic_add (GstElement * element, GstPad * pad, GstDecodeBin * decode_bin)
{
GstDynamic *dyn;
struct DynFind find_info;
GList *found;
g_return_if_fail (element != NULL);
/* do a search that this entry doesn't already exist */
find_info.elem = element;
find_info.pad = pad;
found = g_list_find_custom (decode_bin->dynamics, &find_info,
(GCompareFunc) find_dynamic);
if (found != NULL)
goto exit;
/* take refs */
dyn = g_new0 (GstDynamic, 1);
dyn->element = gst_object_ref (element);
dyn->decode_bin = gst_object_ref (decode_bin);
if (pad) {
dyn->pad = gst_object_ref (pad);
GST_DEBUG_OBJECT (decode_bin, "dynamic create for pad %" GST_PTR_FORMAT,
pad);
dyn->caps_sig_id = g_signal_connect (G_OBJECT (pad), "notify::caps",
G_CALLBACK (new_caps), dyn);
} else {
GST_DEBUG_OBJECT (decode_bin, "dynamic create for element %"
GST_PTR_FORMAT, element);
dyn->np_sig_id = g_signal_connect (G_OBJECT (element), "pad-added",
G_CALLBACK (new_pad), dyn);
dyn->nmp_sig_id = g_signal_connect (G_OBJECT (element), "no-more-pads",
G_CALLBACK (no_more_pads), dyn);
}
/* and add this element to the dynamic elements */
decode_bin->dynamics = g_list_prepend (decode_bin->dynamics, dyn);
return;
exit:
if (element) {
GST_DEBUG_OBJECT (decode_bin, "Dynamic element already added: %"
GST_PTR_FORMAT, element);
} else {
GST_DEBUG_OBJECT (decode_bin, "Dynamic pad already added: %"
GST_PTR_FORMAT, pad);
}
}
static void
dynamic_free (GstDynamic * dyn)
{
GST_DEBUG_OBJECT (dyn->decode_bin, "dynamic free");
/* disconnect signals */
if (dyn->np_sig_id)
g_signal_handler_disconnect (G_OBJECT (dyn->element), dyn->np_sig_id);
if (dyn->nmp_sig_id)
g_signal_handler_disconnect (G_OBJECT (dyn->element), dyn->nmp_sig_id);
if (dyn->caps_sig_id)
g_signal_handler_disconnect (G_OBJECT (dyn->pad), dyn->caps_sig_id);
if (dyn->pad)
gst_object_unref (dyn->pad);
dyn->pad = NULL;
if (dyn->element)
gst_object_unref (dyn->element);
dyn->element = NULL;
gst_object_unref (dyn->decode_bin);
dyn->decode_bin = NULL;
g_free (dyn);
}
static void
free_dynamics (GstDecodeBin * decode_bin)
{
GList *dyns;
for (dyns = decode_bin->dynamics; dyns; dyns = g_list_next (dyns)) {
GstDynamic *dynamic = (GstDynamic *) dyns->data;
dynamic_free (dynamic);
}
g_list_free (decode_bin->dynamics);
decode_bin->dynamics = NULL;
}
/* this function runs through the element factories and returns a list
* of all elements that are able to sink the given caps
*/
static GList *
find_compatibles (GstDecodeBin * decode_bin, const GstCaps * caps)
{
GList *factories;
GList *to_try = NULL;
/* loop over all the factories */
for (factories = decode_bin->factories; factories;
factories = g_list_next (factories)) {
GstElementFactory *factory = GST_ELEMENT_FACTORY (factories->data);
const GList *templates;
GList *walk;
/* get the templates from the element factory */
templates = gst_element_factory_get_static_pad_templates (factory);
for (walk = (GList *) templates; walk; walk = g_list_next (walk)) {
GstStaticPadTemplate *templ = walk->data;
/* we only care about the sink templates */
if (templ->direction == GST_PAD_SINK) {
GstCaps *intersect;
GstCaps *tmpl_caps;
/* try to intersect the caps with the caps of the template */
tmpl_caps = gst_static_caps_get (&templ->static_caps);
intersect = gst_caps_intersect (caps, tmpl_caps);
gst_caps_unref (tmpl_caps);
/* check if the intersection is empty */
if (!gst_caps_is_empty (intersect)) {
/* non empty intersection, we can use this element */
to_try = g_list_prepend (to_try, factory);
gst_caps_unref (intersect);
break;
}
gst_caps_unref (intersect);
}
}
}
to_try = g_list_reverse (to_try);
return to_try;
}
static gboolean
mimetype_is_raw (const gchar * mimetype)
{
return g_str_has_prefix (mimetype, "video/x-raw") ||
g_str_has_prefix (mimetype, "audio/x-raw") ||
g_str_has_prefix (mimetype, "text/plain") ||
g_str_has_prefix (mimetype, "text/x-pango-markup");
}
static void
free_pad_probes (GstDecodeBin * decode_bin)
{
GList *tmp;
/* Remove pad probes */
for (tmp = decode_bin->probes; tmp; tmp = g_list_next (tmp)) {
PadProbeData *data = (PadProbeData *) tmp->data;
gst_pad_remove_data_probe (data->pad, data->sigid);
g_free (data);
}
g_list_free (decode_bin->probes);
decode_bin->probes = NULL;
}
/* used when we need to remove a probe because the decoder we plugged failed
* to activate */
static void
free_pad_probe_for_element (GstDecodeBin * decode_bin, GstElement * element)
{
GList *l;
for (l = decode_bin->probes; l != NULL; l = g_list_next (l)) {
PadProbeData *data = (PadProbeData *) l->data;
if (GST_ELEMENT_CAST (GST_PAD_PARENT (data->pad)) == element) {
gst_pad_remove_data_probe (data->pad, data->sigid);
decode_bin->probes = g_list_delete_link (decode_bin->probes, l);
g_free (data);
return;
}
}
}
static gboolean
add_fakesink (GstDecodeBin * decode_bin)
{
if (decode_bin->fakesink != NULL)
return TRUE;
g_mutex_lock (decode_bin->cb_mutex);
decode_bin->fakesink = gst_element_factory_make ("fakesink", "fakesink");
if (!decode_bin->fakesink)
goto no_fakesink;
/* hacky, remove sink flag, we don't want our decodebin to become a sink
* just because we add a fakesink element to make us ASYNC */
GST_OBJECT_FLAG_UNSET (decode_bin->fakesink, GST_ELEMENT_IS_SINK);
/* takes ownership */
if (!gst_bin_add (GST_BIN (decode_bin), decode_bin->fakesink)) {
g_warning ("Could not add fakesink element, decodebin will not work");
gst_object_unref (decode_bin->fakesink);
decode_bin->fakesink = NULL;
}
g_mutex_unlock (decode_bin->cb_mutex);
return TRUE;
/* ERRORS */
no_fakesink:
{
g_warning ("can't find fakesink element, decodebin will not work");
g_mutex_unlock (decode_bin->cb_mutex);
return FALSE;
}
}
static void
remove_fakesink (GstDecodeBin * decode_bin)
{
gboolean removed_fakesink = FALSE;
if (decode_bin->fakesink == NULL)
return;
g_mutex_lock (decode_bin->cb_mutex);
if (decode_bin->fakesink) {
GST_DEBUG_OBJECT (decode_bin, "Removing fakesink and marking state dirty");
/* Lock the state to prevent it from changing state to non-NULL
* before it's removed */
gst_element_set_locked_state (decode_bin->fakesink, TRUE);
/* setting the state to NULL is never async */
gst_element_set_state (decode_bin->fakesink, GST_STATE_NULL);
gst_bin_remove (GST_BIN (decode_bin), decode_bin->fakesink);
decode_bin->fakesink = NULL;
removed_fakesink = TRUE;
}
g_mutex_unlock (decode_bin->cb_mutex);
if (removed_fakesink) {
free_pad_probes (decode_bin);
}
}
/* this should be implemented with _pad_block() */
static gboolean
pad_probe (GstPad * pad, GstMiniObject * data, GstDecodeBin * decode_bin)
{
GList *tmp;
gboolean alldone = TRUE;
for (tmp = decode_bin->probes; tmp; tmp = g_list_next (tmp)) {
PadProbeData *pdata = (PadProbeData *) tmp->data;
if (pdata->pad == pad) {
if (GST_IS_BUFFER (data)) {
if (!pdata->done)
decode_bin->numwaiting--;
pdata->done = TRUE;
} else if (GST_IS_EVENT (data) &&
((GST_EVENT_TYPE (data) == GST_EVENT_EOS) ||
(GST_EVENT_TYPE (data) == GST_EVENT_TAG) ||
(GST_EVENT_TYPE (data) == GST_EVENT_FLUSH_START))) {
/* FIXME, what about NEWSEGMENT? really, use _pad_block()... */
if (!pdata->done)
decode_bin->numwaiting--;
pdata->done = TRUE;
}
}
if (!(pdata->done)) {
GST_LOG_OBJECT (decode_bin, "Pad probe on pad %" GST_PTR_FORMAT
" but pad %" GST_PTR_FORMAT " still needs data.", pad, pdata->pad);
alldone = FALSE;
}
}
if (alldone)
remove_fakesink (decode_bin);
return TRUE;
}
/* FIXME: this should be somehow merged with the queue code in
* try_to_link_1() to reduce code duplication */
static GstPad *
add_raw_queue (GstDecodeBin * decode_bin, GstPad * pad)
{
GstElement *queue = NULL;
GstPad *queuesinkpad = NULL, *queuesrcpad = NULL;
queue = gst_element_factory_make ("queue", NULL);
decode_bin->queue_type = G_OBJECT_TYPE (queue);
g_object_set (G_OBJECT (queue), "max-size-buffers", 0, NULL);
g_object_set (G_OBJECT (queue), "max-size-time", G_GINT64_CONSTANT (0), NULL);
g_object_set (G_OBJECT (queue), "max-size-bytes", 8192, NULL);
gst_bin_add (GST_BIN (decode_bin), queue);
gst_element_set_state (queue, GST_STATE_READY);
queuesinkpad = gst_element_get_static_pad (queue, "sink");
queuesrcpad = gst_element_get_static_pad (queue, "src");
if (gst_pad_link (pad, queuesinkpad) != GST_PAD_LINK_OK) {
GST_WARNING_OBJECT (decode_bin,
"Linking queue failed, trying without queue");
gst_element_set_state (queue, GST_STATE_NULL);
gst_object_unref (queuesrcpad);
gst_object_unref (queuesinkpad);
gst_bin_remove (GST_BIN (decode_bin), queue);
return gst_object_ref (pad);
}
decode_bin->queues = g_list_append (decode_bin->queues, queue);
g_signal_connect (G_OBJECT (queue),
"overrun", G_CALLBACK (queue_filled_cb), decode_bin);
g_signal_connect (G_OBJECT (queue),
"underrun", G_CALLBACK (queue_underrun_cb), decode_bin);
gst_element_set_state (queue, GST_STATE_PAUSED);
gst_object_unref (queuesinkpad);
return queuesrcpad;
}
/* given a pad and a caps from an element, find the list of elements
* that could connect to the pad
*
* If the pad has a raw format, this function will create a ghostpad
* for the pad onto the decodebin.
*
* If no compatible elements could be found, this function will signal
* the unknown_type signal.
*/
static void
close_pad_link (GstElement * element, GstPad * pad, GstCaps * caps,
GstDecodeBin * decode_bin, gboolean more)
{
GstStructure *structure;
const gchar *mimetype;
gchar *padname;
gint diff;
padname = gst_pad_get_name (pad);
diff = strncmp (padname, "current_", 8);
g_free (padname);
/* hack.. ignore current pads */
if (!diff)
return;
/* the caps is empty, this means the pad has no type, we can only
* decide to fire the unknown_type signal. */
if (caps == NULL || gst_caps_is_empty (caps))
goto unknown_type;
/* the caps is any, this means the pad can be anything and
* we don't know yet */
if (gst_caps_is_any (caps))
goto dont_know_yet;
GST_LOG_OBJECT (element, "trying to close %" GST_PTR_FORMAT, caps);
/* FIXME, iterate over more structures? I guess it is possible that
* this pad has some encoded and some raw pads. This code will fail
* then if the first structure is not the raw type... */
structure = gst_caps_get_structure (caps, 0);
mimetype = gst_structure_get_name (structure);
/* first see if this is raw. If the type is raw, we can
* create a ghostpad for this pad. It's possible that the caps are not
* fixed. */
if (mimetype_is_raw (mimetype)) {
gchar *padname;
GstPad *ghost;
PadProbeData *data;
/* If we're at a demuxer element but have raw data already
* we have to add a queue here. For non-raw data this is done
* in try_to_link_1() */
if (is_demuxer_element (element)) {
GST_DEBUG_OBJECT (decode_bin,
"Element %s is a demuxer, inserting a queue",
GST_OBJECT_NAME (element));
pad = add_raw_queue (decode_bin, pad);
}
/* make a unique name for this new pad */
padname = g_strdup_printf ("src%d", decode_bin->numpads);
decode_bin->numpads++;
/* make it a ghostpad */
ghost = gst_ghost_pad_new (padname, pad);
gst_pad_set_active (ghost, TRUE);
gst_element_add_pad (GST_ELEMENT (decode_bin), ghost);
data = g_new0 (PadProbeData, 1);
data->pad = pad;
data->done = FALSE;
/* FIXME, use _pad_block() */
data->sigid = gst_pad_add_data_probe (pad, G_CALLBACK (pad_probe),
decode_bin);
decode_bin->numwaiting++;
decode_bin->probes = g_list_append (decode_bin->probes, data);
GST_LOG_OBJECT (element, "closed pad %s", padname);
/* our own signal with an extra flag that this is the only pad */
GST_DEBUG_OBJECT (decode_bin, "emitting new-decoded-pad");
g_signal_emit (G_OBJECT (decode_bin),
gst_decode_bin_signals[SIGNAL_NEW_DECODED_PAD], 0, ghost, !more);
GST_DEBUG_OBJECT (decode_bin, "emitted new-decoded-pad");
g_free (padname);
/* If we're at a demuxer element pad was set to a queue's
* srcpad and must be unref'd here */
if (is_demuxer_element (element))
gst_object_unref (pad);
} else {
GList *to_try;
/* if the caps has many types, we need to delay */
if (!gst_caps_is_fixed (caps))
goto many_types;
/* continue plugging, first find all compatible elements */
to_try = find_compatibles (decode_bin, caps);
if (to_try == NULL)
/* no compatible elements, we cannot go on */
goto unknown_type;
if (try_to_link_1 (decode_bin, element, pad, to_try) == NULL) {
g_list_free (to_try);
GST_LOG_OBJECT (pad, "none of the allegedly available elements usable");
goto unknown_type;
}
/* can free the list again now */
g_list_free (to_try);
}
return;
/* ERRORS */
unknown_type:
{
GST_LOG_OBJECT (pad, "unknown type found, fire signal");
g_signal_emit (G_OBJECT (decode_bin),
gst_decode_bin_signals[SIGNAL_UNKNOWN_TYPE], 0, pad, caps);
gst_element_post_message (GST_ELEMENT_CAST (decode_bin),
gst_missing_decoder_message_new (GST_ELEMENT_CAST (decode_bin), caps));
if (element == decode_bin->typefind) {
gchar *desc;
desc = gst_pb_utils_get_decoder_description (caps);
GST_ELEMENT_ERROR (decode_bin, STREAM, CODEC_NOT_FOUND,
(_("A %s plugin is required to play this stream, but not installed."),
desc),
("No decoder to handle media type '%s'",
gst_structure_get_name (gst_caps_get_structure (caps, 0))));
g_free (desc);
}
return;
}
dont_know_yet:
{
GST_LOG_OBJECT (pad, "type is not known yet");
goto setup_caps_delay;
}
many_types:
{
GST_LOG_OBJECT (pad, "many possible types");
goto setup_caps_delay;
}
setup_caps_delay:
{
GST_LOG_OBJECT (pad, "setting up a delayed link");
dynamic_add (element, pad, decode_bin);
return;
}
}
/* 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_klass (srcfactory);
/* Can't be a demuxer unless it has Demux in the klass name */
if (klass == NULL || !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;
}
/*
* given a list of element factories, try to link one of the factories
* to the given pad.
*
* The function returns the element that was successfully linked to the
* pad.
*/
static GstElement *
try_to_link_1 (GstDecodeBin * decode_bin, GstElement * srcelement, GstPad * pad,
GList * factories)
{
GList *walk;
GstElement *result = NULL;
gboolean isdemux = FALSE;
GstPad *queuesinkpad = NULL, *queuesrcpad = NULL;
GstElement *queue = NULL;
GstPad *usedsrcpad = pad;
/* Check if the parent of the src pad is a demuxer */
isdemux = is_demuxer_element (srcelement);
if (isdemux && factories != NULL) {
GstPadLinkReturn dqlink;
/* Insert a queue between demuxer and decoder */
GST_DEBUG_OBJECT (decode_bin,
"Element %s is a demuxer, inserting a queue",
GST_OBJECT_NAME (srcelement));
queue = gst_element_factory_make ("queue", NULL);
decode_bin->queue_type = G_OBJECT_TYPE (queue);
g_object_set (G_OBJECT (queue), "max-size-buffers", 0, NULL);
g_object_set (G_OBJECT (queue), "max-size-time", G_GINT64_CONSTANT (0),
NULL);
g_object_set (G_OBJECT (queue), "max-size-bytes", 8192, NULL);
gst_bin_add (GST_BIN (decode_bin), queue);
gst_element_set_state (queue, GST_STATE_READY);
queuesinkpad = gst_element_get_static_pad (queue, "sink");
usedsrcpad = queuesrcpad = gst_element_get_static_pad (queue, "src");
dqlink = gst_pad_link (pad, queuesinkpad);
g_return_val_if_fail (dqlink == GST_PAD_LINK_OK, NULL);
}
/* loop over the factories */
for (walk = factories; walk; walk = g_list_next (walk)) {
GstElementFactory *factory = GST_ELEMENT_FACTORY (walk->data);
GstElement *element;
GstPadLinkReturn ret;
GstPad *sinkpad;
GST_DEBUG_OBJECT (decode_bin, "trying to link %s",
gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory)));
/* make an element from the factory first */
if ((element = gst_element_factory_create (factory, NULL)) == NULL) {
/* hmm, strange. Like with all things in life, let's move on.. */
GST_WARNING_OBJECT (decode_bin, "could not create an element from %s",
gst_plugin_feature_get_name (GST_PLUGIN_FEATURE (factory)));
continue;
}
/* try to link the given pad to a sinkpad */
/* FIXME, find the sinkpad by looping over the pads instead of
* looking it up by name */
if ((sinkpad = gst_element_get_static_pad (element, "sink")) == NULL) {
/* if no pad is found we can't do anything */
GST_WARNING_OBJECT (decode_bin, "could not find sinkpad in element");
continue;
}
/* now add the element to the bin first */
GST_DEBUG_OBJECT (decode_bin, "adding %s", GST_OBJECT_NAME (element));
gst_bin_add (GST_BIN (decode_bin), element);
/* set to READY first so it is ready, duh. */
if (gst_element_set_state (element,
GST_STATE_READY) == GST_STATE_CHANGE_FAILURE) {
GST_WARNING_OBJECT (decode_bin, "Couldn't set %s to READY",
GST_ELEMENT_NAME (element));
/* get rid of the sinkpad */
gst_object_unref (sinkpad);
/* this element did not work, remove it again and continue trying
* other elements, the element will be disposed. */
/* FIXME: shouldn't we do this before adding it to the bin so that no
* error messages get through to the app? (tpm) */
gst_bin_remove (GST_BIN (decode_bin), element);
continue;
}
if ((ret = gst_pad_link (usedsrcpad, sinkpad)) != GST_PAD_LINK_OK) {
GST_DEBUG_OBJECT (decode_bin, "link failed on pad %s:%s, reason %d",
GST_DEBUG_PAD_NAME (pad), ret);
/* get rid of the sinkpad */
gst_object_unref (sinkpad);
/* this element did not work, remove it again and continue trying
* other elements, the element will be disposed. */
gst_element_set_state (element, GST_STATE_NULL);
gst_bin_remove (GST_BIN (decode_bin), element);
} else {
guint sig;
GST_DEBUG_OBJECT (decode_bin, "linked on pad %s:%s",
GST_DEBUG_PAD_NAME (usedsrcpad));
/* configure the queue some more */
if (queue != NULL) {
decode_bin->queues = g_list_append (decode_bin->queues, queue);
g_signal_connect (G_OBJECT (queue),
"overrun", G_CALLBACK (queue_filled_cb), decode_bin);
g_signal_connect (G_OBJECT (queue),
"underrun", G_CALLBACK (queue_underrun_cb), decode_bin);
}
/* The link worked, now figure out what it was that we connected */
/* make sure we catch unlink signals */
sig = g_signal_connect (G_OBJECT (pad), "unlinked",
G_CALLBACK (unlinked), decode_bin);
/* now that we added the element we can try to continue autoplugging
* on it until we have a raw type */
close_link (element, decode_bin);
/* change the state of the element to that of the parent */
if ((gst_element_set_state (element,
GST_STATE_PAUSED)) == GST_STATE_CHANGE_FAILURE) {
GST_WARNING_OBJECT (decode_bin, "Couldn't set %s to PAUSED",
GST_ELEMENT_NAME (element));
/* close_link -> close_pad_link -> might have set up a pad probe */
free_pad_probe_for_element (decode_bin, element);
gst_element_set_state (element, GST_STATE_NULL);
gst_bin_remove (GST_BIN (decode_bin), element);
continue;
}
result = element;
/* get rid of the sinkpad now */
gst_object_unref (sinkpad);
/* Set the queue to paused and set the pointer to NULL so we don't
* remove it below */
if (queue != NULL) {
gst_element_set_state (queue, GST_STATE_PAUSED);
queue = NULL;
gst_object_unref (queuesrcpad);
gst_object_unref (queuesinkpad);
}
/* and exit */
goto done;
}
}
done:
if (queue != NULL) {
/* We didn't successfully connect to the queue */
gst_pad_unlink (pad, queuesinkpad);
gst_element_set_state (queue, GST_STATE_NULL);
gst_object_unref (queuesrcpad);
gst_object_unref (queuesinkpad);
gst_bin_remove (GST_BIN (decode_bin), queue);
}
return result;
}
static GstPad *
get_our_ghost_pad (GstDecodeBin * decode_bin, GstPad * pad)
{
GstIterator *pad_it = NULL;
GstPad *db_pad = NULL;
gboolean done = FALSE;
if (pad == NULL || !GST_PAD_IS_SRC (pad)) {
GST_DEBUG_OBJECT (decode_bin, "pad NULL or not SRC pad");
return NULL;
}
/* our ghostpads are the sourcepads */
pad_it = gst_element_iterate_src_pads (GST_ELEMENT (decode_bin));
while (!done) {
db_pad = NULL;
switch (gst_iterator_next (pad_it, (gpointer) & db_pad)) {
case GST_ITERATOR_OK:
GST_DEBUG_OBJECT (decode_bin, "looking at pad %s:%s",
GST_DEBUG_PAD_NAME (db_pad));
if (GST_IS_GHOST_PAD (db_pad)) {
GstPad *target_pad = NULL;
target_pad = gst_ghost_pad_get_target (GST_GHOST_PAD (db_pad));
done = (target_pad == pad);
if (target_pad)
gst_object_unref (target_pad);
if (done) {
/* Found our ghost pad */
GST_DEBUG_OBJECT (decode_bin, "found ghostpad %s:%s for pad %s:%s",
GST_DEBUG_PAD_NAME (db_pad), GST_DEBUG_PAD_NAME (pad));
break;
}
}
/* Not the right one */
gst_object_unref (db_pad);
break;
case GST_ITERATOR_RESYNC:
gst_iterator_resync (pad_it);
break;
case GST_ITERATOR_ERROR:
done = TRUE;
break;
case GST_ITERATOR_DONE:
done = TRUE;
break;
}
}
gst_iterator_free (pad_it);
return db_pad;
}
/* remove all downstream elements starting from the given pad.
* Also make sure to remove the ghostpad we created for the raw
* decoded stream.
*/
static void
remove_element_chain (GstDecodeBin * decode_bin, GstPad * pad)
{
GList *int_links, *walk;
GstElement *elem = GST_ELEMENT (GST_OBJECT_PARENT (pad));
while (GST_OBJECT_PARENT (elem) &&
GST_OBJECT_PARENT (elem) != GST_OBJECT (decode_bin))
elem = GST_ELEMENT (GST_OBJECT_PARENT (elem));
if (G_OBJECT_TYPE (elem) == decode_bin->queue_type) {
GST_DEBUG_OBJECT (decode_bin,
"Encountered demuxer output queue while removing element chain");
decode_bin->queues = g_list_remove (decode_bin->queues, elem);
}
GST_DEBUG_OBJECT (decode_bin, "%s:%s", GST_DEBUG_PAD_NAME (pad));
int_links = gst_pad_get_internal_links (pad);
/* remove all elements linked to this pad up to the ghostpad
* that we created for this stream */
for (walk = int_links; walk; walk = g_list_next (walk)) {
GstPad *pad;
GstPad *ghostpad;
GstPad *peer;
pad = GST_PAD (walk->data);
GST_DEBUG_OBJECT (decode_bin, "inspecting internal pad %s:%s",
GST_DEBUG_PAD_NAME (pad));
ghostpad = get_our_ghost_pad (decode_bin, pad);
if (ghostpad) {
GST_DEBUG_OBJECT (decode_bin, "found our ghost pad %s:%s for %s:%s",
GST_DEBUG_PAD_NAME (ghostpad), GST_DEBUG_PAD_NAME (pad));
g_signal_emit (G_OBJECT (decode_bin),
gst_decode_bin_signals[SIGNAL_REMOVED_DECODED_PAD], 0, ghostpad);
gst_element_remove_pad (GST_ELEMENT (decode_bin), ghostpad);
gst_object_unref (ghostpad);
continue;
} else {
GST_DEBUG_OBJECT (decode_bin, "not one of our ghostpads");
}
peer = gst_pad_get_peer (pad);
if (peer == NULL)
continue;
GST_DEBUG_OBJECT (decode_bin, "internal pad %s:%s linked to pad %s:%s",
GST_DEBUG_PAD_NAME (pad), GST_DEBUG_PAD_NAME (peer));
{
GstObject *parent = gst_pad_get_parent (peer);
if (parent) {
GstObject *grandparent = gst_object_get_parent (parent);
if (grandparent != NULL) {
if (GST_ELEMENT (grandparent) != GST_ELEMENT (decode_bin)) {
GST_DEBUG_OBJECT (decode_bin, "dead end pad %s:%s parent %s",
GST_DEBUG_PAD_NAME (peer), GST_OBJECT_NAME (grandparent));
} else {
GST_DEBUG_OBJECT (decode_bin, "recursing element %s on pad %s:%s",
GST_ELEMENT_NAME (elem), GST_DEBUG_PAD_NAME (pad));
remove_element_chain (decode_bin, peer);
}
gst_object_unref (grandparent);
}
gst_object_unref (parent);
}
}
gst_object_unref (peer);
}
GST_DEBUG_OBJECT (decode_bin, "removing %s", GST_ELEMENT_NAME (elem));
g_list_free (int_links);
gst_element_set_state (elem, GST_STATE_NULL);
gst_bin_remove (GST_BIN (decode_bin), elem);
}
/* there are @bytes bytes in @queue, enlarge it
*
* Returns: new max number of bytes in @queue
*/
static guint
queue_enlarge (GstElement * queue, guint bytes, GstDecodeBin * decode_bin)
{
/* Increase the queue size by 1Mbyte if it is over 1Mb, else double its current limit
*/
if (bytes > 1024 * 1024)
bytes += 1024 * 1024;
else
bytes *= 2;
GST_DEBUG_OBJECT (decode_bin,
"increasing queue %s max-size-bytes to %d", GST_ELEMENT_NAME (queue),
bytes);
g_object_set (G_OBJECT (queue), "max-size-bytes", bytes, NULL);
return bytes;
}
/* this callback is called when our queues fills up or are empty
* We then check the status of all other queues to make sure we
* never have an empty and full queue at the same time since that
* would block dataflow. In the case of a filled queue, we make
* it larger.
*/
static void
queue_underrun_cb (GstElement * queue, GstDecodeBin * decode_bin)
{
/* FIXME: we don't really do anything here for now. Ideally we should
* see if some of the queues are filled and increase their values
* in that case.
* Note: be very carefull with thread safety here as this underrun
* signal is done from the streaming thread of queue srcpad which
* is different from the pad_added (where we add the queue to the
* list) and the overrun signals that are signalled from the
* demuxer thread.
*/
GST_DEBUG_OBJECT (decode_bin, "got underrun");
}
/* Make sure we don't have a full queue and empty queue situation */
static void
queue_filled_cb (GstElement * queue, GstDecodeBin * decode_bin)
{
GList *tmp;
gboolean increase = FALSE;
guint bytes;
/* get current byte level from the queue that is filled */
g_object_get (G_OBJECT (queue), "current-level-bytes", &bytes, NULL);
GST_DEBUG_OBJECT (decode_bin, "One of the queues is full at %d bytes", bytes);
/* we do not buffer more than 20Mb */
if (bytes > (20 * 1024 * 1024))
goto too_large;
/* check all other queue to see if one is empty, in that case
* we need to enlarge @queue */
for (tmp = decode_bin->queues; tmp; tmp = g_list_next (tmp)) {
GstElement *aqueue = GST_ELEMENT (tmp->data);
guint levelbytes = 0;
if (aqueue != queue) {
g_object_get (G_OBJECT (aqueue), "current-level-bytes", &levelbytes,
NULL);
if (levelbytes == 0) {
/* yup, found an empty queue, we can stop the search and
* need to enlarge the queue */
increase = TRUE;
break;
}
}
}
if (increase) {
/* enlarge @queue */
queue_enlarge (queue, bytes, decode_bin);
} else {
GST_DEBUG_OBJECT (decode_bin,
"Queue is full but other queues are not empty, not doing anything");
}
return;
/* errors */
too_large:
{
GST_WARNING_OBJECT (decode_bin,
"Queue is bigger than 20Mbytes, something else is going wrong");
return;
}
}
/* This function will be called when a dynamic pad is created on an element.
* We try to continue autoplugging on this new pad. */
static void
new_pad (GstElement * element, GstPad * pad, GstDynamic * dynamic)
{
GstDecodeBin *decode_bin = dynamic->decode_bin;
GstCaps *caps;
gboolean more;
GST_OBJECT_LOCK (decode_bin);
if (decode_bin->shutting_down)
goto shutting_down1;
GST_OBJECT_UNLOCK (decode_bin);
GST_STATE_LOCK (decode_bin);
if (decode_bin->shutting_down)
goto shutting_down2;
/* see if any more pending dynamic connections exist */
more = gst_decode_bin_is_dynamic (decode_bin);
caps = gst_pad_get_caps (pad);
close_pad_link (element, pad, caps, decode_bin, more);
if (caps)
gst_caps_unref (caps);
GST_STATE_UNLOCK (decode_bin);
return;
shutting_down1:
{
GST_DEBUG_OBJECT (decode_bin, "we are shutting down");
GST_OBJECT_UNLOCK (decode_bin);
return;
}
shutting_down2:
{
GST_DEBUG_OBJECT (decode_bin, "we are shutting down");
GST_STATE_UNLOCK (decode_bin);
return;
}
}
static void
dynamic_remove (GstDynamic * dynamic)
{
GstDecodeBin *decode_bin = dynamic->decode_bin;
/* remove the dynamic from the list of dynamics */
decode_bin->dynamics = g_list_remove (decode_bin->dynamics, dynamic);
dynamic_free (dynamic);
/* if we have no more dynamic elements, we have no chance of creating
* more pads, so we fire the no_more_pads signal */
if (decode_bin->dynamics == NULL) {
if (decode_bin->numwaiting == 0) {
GST_DEBUG_OBJECT (decode_bin,
"no more dynamic elements, removing fakesink");
remove_fakesink (decode_bin);
}
GST_DEBUG_OBJECT (decode_bin,
"no more dynamic elements, signaling no_more_pads");
gst_element_no_more_pads (GST_ELEMENT (decode_bin));
} else {
GST_DEBUG_OBJECT (decode_bin, "we have more dynamic elements");
}
}
/* this signal is fired when an element signals the no_more_pads signal.
* This means that the element will not generate more dynamic pads and
* we can remove the element from the list of dynamic elements. When we
* have no more dynamic elements in the pipeline, we can fire a no_more_pads
* signal ourselves. */
static void
no_more_pads (GstElement * element, GstDynamic * dynamic)
{
GST_DEBUG_OBJECT (dynamic->decode_bin, "no more pads on element %s",
GST_ELEMENT_NAME (element));
dynamic_remove (dynamic);
}
static void
new_caps (GstPad * pad, GParamSpec * unused, GstDynamic * dynamic)
{
GST_DEBUG_OBJECT (dynamic->decode_bin, "delayed link triggered");
new_pad (dynamic->element, pad, dynamic);
/* assume it worked and remove the dynamic */
dynamic_remove (dynamic);
return;
}
static gboolean
is_our_kid (GstElement * e, GstDecodeBin * decode_bin)
{
gboolean ret;
GstElement *parent;
parent = (GstElement *) gst_object_get_parent ((GstObject *) e);
ret = (parent == (GstElement *) decode_bin);
if (parent)
gst_object_unref ((GstObject *) parent);
return ret;
}
static gboolean
elem_is_dynamic (GstElement * element, GstDecodeBin * decode_bin)
{
GList *pads;
/* loop over all the padtemplates */
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 (decode_bin, "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_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 (decode_bin, "got the pad for sometimes template %s",
templ_name);
gst_object_unref (pad);
} else {
GST_DEBUG_OBJECT (decode_bin,
"did not get the sometimes pad of template %s", templ_name);
/* we have an element that will create dynamic pads */
return TRUE;
}
break;
}
default:
/* Don't care about ALWAYS or REQUEST pads */
break;
}
}
return FALSE;
}
/* This function will be called when a pad is disconnected for some reason */
static void
unlinked (GstPad * pad, GstPad * peerpad, GstDecodeBin * decode_bin)
{
GstElement *element, *peer;
/* inactivate pad */
gst_pad_set_active (pad, GST_ACTIVATE_NONE);
peer = gst_pad_get_parent_element (peerpad);
if (!is_our_kid (peer, decode_bin))
goto exit;
GST_DEBUG_OBJECT (decode_bin, "pad %s:%s removal while alive - chained?",
GST_DEBUG_PAD_NAME (pad));
/* remove all elements linked to the peerpad */
remove_element_chain (decode_bin, peerpad);
/* Re-add as a dynamic element if needed, via close_link */
element = gst_pad_get_parent_element (pad);
if (element) {
if (elem_is_dynamic (element, decode_bin))
dynamic_add (element, NULL, decode_bin);
gst_object_unref (element);
}
exit:
gst_object_unref (peer);
}
/* this function inspects the given element and tries to connect something
* on the srcpads. If there are dynamic pads, it sets up a signal handler to
* continue autoplugging when they become available */
static void
close_link (GstElement * element, GstDecodeBin * decode_bin)
{
GList *pads;
gboolean dynamic = FALSE;
GList *to_connect = NULL;
gboolean more;
GST_DEBUG_OBJECT (decode_bin, "closing links with element %s",
GST_ELEMENT_NAME (element));
/* loop over all the padtemplates */
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 (decode_bin, "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 (decode_bin, "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 (decode_bin,
"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 (decode_bin, "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 (decode_bin,
"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 (decode_bin, "ignoring request padtemplate %s",
templ_name);
break;
}
}
if (dynamic) {
GST_DEBUG_OBJECT (decode_bin, "got a dynamic element here");
/* ok, this element has dynamic pads, set up the signal handlers to be
* notified of them */
dynamic_add (element, NULL, decode_bin);
}
/* Check if this is an element with more than 1 pad. If this element
* has more than 1 pad, we need to be carefull not to signal the
* no_more_pads signal after connecting the first pad. */
more = g_list_length (to_connect) > 1;
/* now loop over all the pads we need to connect */
for (pads = to_connect; pads; pads = g_list_next (pads)) {
GstPad *pad = GST_PAD_CAST (pads->data);
GstCaps *caps;
/* we have more pads if we have more than 1 pad to connect or
* dynamics. If we have only 1 pad and no dynamics, more will be
* set to FALSE and the no-more-pads signal will be fired. Note
* that this can change after the close_pad_link call. */
more |= gst_decode_bin_is_dynamic (decode_bin);
GST_DEBUG_OBJECT (decode_bin, "closing pad link for %s",
GST_OBJECT_NAME (pad));
/* continue autoplugging on the pads */
caps = gst_pad_get_caps (pad);
close_pad_link (element, pad, caps, decode_bin, more);
if (caps)
gst_caps_unref (caps);
gst_object_unref (pad);
}
g_list_free (to_connect);
}
/* this is the signal handler for the typefind element have_type signal.
* It tries to continue autoplugging on the typefind src pad */
static void
type_found (GstElement * typefind, guint probability, GstCaps * caps,
GstDecodeBin * decode_bin)
{
gboolean dynamic;
GstPad *pad;
GST_DEBUG_OBJECT (decode_bin, "typefind found caps %" GST_PTR_FORMAT, caps);
GST_OBJECT_LOCK (decode_bin);
if (decode_bin->shutting_down)
goto shutting_down;
GST_OBJECT_UNLOCK (decode_bin);
GST_STATE_LOCK (decode_bin);
if (decode_bin->shutting_down)
goto exit;
/* don't need the typefind anymore if we already found a type, we're not going
* to be able to do anything with it anyway except for generating errors */
if (decode_bin->have_type)
goto exit;
decode_bin->have_type = TRUE;
/* special-case text/plain: we only want to accept it as a raw type if it
* comes from a subtitle parser element or a demuxer, but not if it is the
* type of the entire stream, in which case we just want to error out */
if (typefind == decode_bin->typefind &&
gst_structure_has_name (gst_caps_get_structure (caps, 0), "text/plain")) {
gst_element_no_more_pads (GST_ELEMENT (decode_bin));
/* we can't handle this type of stream */
GST_ELEMENT_ERROR (decode_bin, STREAM, WRONG_TYPE,
(_("This appears to be a text file")),
("decodebin cannot decode plain text files"));
goto exit;
}
/* autoplug the new pad with the caps that the signal gave us. */
pad = gst_element_get_static_pad (typefind, "src");
close_pad_link (typefind, pad, caps, decode_bin, FALSE);
gst_object_unref (pad);
dynamic = gst_decode_bin_is_dynamic (decode_bin);
if (dynamic == FALSE) {
GST_DEBUG_OBJECT (decode_bin, "we have no dynamic elements anymore");
/* if we have no dynamic elements, we know that no new pads
* will be created and we can signal out no_more_pads signal */
gst_element_no_more_pads (GST_ELEMENT (decode_bin));
} else {
/* more dynamic elements exist that could create new pads */
GST_DEBUG_OBJECT (decode_bin, "we have more dynamic elements");
}
exit:
GST_STATE_UNLOCK (decode_bin);
return;
shutting_down:
{
GST_DEBUG_OBJECT (decode_bin, "we are shutting down");
GST_OBJECT_UNLOCK (decode_bin);
return;
}
}
static void
disconnect_unlinked_signals (GstDecodeBin * decode_bin, GstElement * element)
{
GstIterator *pad_it = NULL;
gboolean done = FALSE;
pad_it = gst_element_iterate_src_pads (element);
while (!done) {
GstPad *pad = NULL;
switch (gst_iterator_next (pad_it, (gpointer) & pad)) {
case GST_ITERATOR_OK:
g_signal_handlers_disconnect_by_func (pad, (gpointer) unlinked,
decode_bin);
gst_object_unref (pad);
break;
case GST_ITERATOR_RESYNC:
gst_iterator_resync (pad_it);
break;
default:
done = TRUE;
break;
}
}
gst_iterator_free (pad_it);
}
static void
cleanup_decodebin (GstDecodeBin * decode_bin)
{
GstIterator *elem_it = NULL, *gpad_it = NULL;
GstPad *typefind_pad = NULL;
gboolean done = FALSE;
g_return_if_fail (GST_IS_DECODE_BIN (decode_bin));
GST_DEBUG_OBJECT (decode_bin, "cleaning up decodebin");
typefind_pad = gst_element_get_static_pad (decode_bin->typefind, "src");
if (GST_IS_PAD (typefind_pad)) {
g_signal_handlers_block_by_func (typefind_pad, (gpointer) unlinked,
decode_bin);
}
elem_it = gst_bin_iterate_elements (GST_BIN (decode_bin));
while (!done) {
GstElement *element = NULL;
switch (gst_iterator_next (elem_it, (gpointer) & element)) {
case GST_ITERATOR_OK:
if (element != decode_bin->typefind && element != decode_bin->fakesink) {
GST_DEBUG_OBJECT (element, "removing autoplugged element");
disconnect_unlinked_signals (decode_bin, element);
gst_element_set_state (element, GST_STATE_NULL);
gst_bin_remove (GST_BIN (decode_bin), element);
}
gst_object_unref (element);
break;
case GST_ITERATOR_RESYNC:
gst_iterator_resync (elem_it);
break;
case GST_ITERATOR_ERROR:
done = TRUE;
break;
case GST_ITERATOR_DONE:
done = TRUE;
break;
}
}
gst_iterator_free (elem_it);
done = FALSE;
gpad_it = gst_element_iterate_pads (GST_ELEMENT (decode_bin));
while (!done) {
GstPad *pad = NULL;
switch (gst_iterator_next (gpad_it, (gpointer) & pad)) {
case GST_ITERATOR_OK:
GST_DEBUG_OBJECT (pad, "inspecting pad %s:%s",
GST_DEBUG_PAD_NAME (pad));
if (GST_IS_GHOST_PAD (pad) && GST_PAD_IS_SRC (pad)) {
GST_DEBUG_OBJECT (pad, "removing ghost pad");
gst_element_remove_pad (GST_ELEMENT (decode_bin), pad);
}
gst_object_unref (pad);
break;
case GST_ITERATOR_RESYNC:
gst_iterator_resync (gpad_it);
break;
case GST_ITERATOR_ERROR:
done = TRUE;
break;
case GST_ITERATOR_DONE:
done = TRUE;
break;
}
}
gst_iterator_free (gpad_it);
if (GST_IS_PAD (typefind_pad)) {
g_signal_handlers_unblock_by_func (typefind_pad, (gpointer) unlinked,
decode_bin);
g_signal_handlers_disconnect_by_func (typefind_pad, (gpointer) unlinked,
decode_bin);
gst_object_unref (typefind_pad);
}
}
static GstStateChangeReturn
gst_decode_bin_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret;
GstDecodeBin *decode_bin;
decode_bin = GST_DECODE_BIN (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
decode_bin->numpads = 0;
decode_bin->numwaiting = 0;
decode_bin->dynamics = NULL;
if (decode_bin->typefind == NULL)
goto missing_typefind;
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
GST_OBJECT_LOCK (decode_bin);
decode_bin->shutting_down = FALSE;
decode_bin->have_type = FALSE;
GST_OBJECT_UNLOCK (decode_bin);
if (!add_fakesink (decode_bin))
goto missing_fakesink;
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
GST_OBJECT_LOCK (decode_bin);
decode_bin->shutting_down = TRUE;
GST_OBJECT_UNLOCK (decode_bin);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
if (ret == GST_STATE_CHANGE_FAILURE)
return ret;
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
case GST_STATE_CHANGE_READY_TO_NULL:
free_dynamics (decode_bin);
free_pad_probes (decode_bin);
cleanup_decodebin (decode_bin);
break;
default:
break;
}
return ret;
/* ERRORS */
missing_typefind:
{
gst_element_post_message (element,
gst_missing_element_message_new (element, "typefind"));
GST_ELEMENT_ERROR (element, CORE, MISSING_PLUGIN, (NULL), ("no typefind!"));
return GST_STATE_CHANGE_FAILURE;
}
missing_fakesink:
{
gst_element_post_message (element,
gst_missing_element_message_new (element, "fakesink"));
GST_ELEMENT_ERROR (element, CORE, MISSING_PLUGIN, (NULL), ("no fakesink!"));
return GST_STATE_CHANGE_FAILURE;
}
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_decode_bin_debug, "decodebin", 0, "decoder bin");
#ifdef ENABLE_NLS
GST_DEBUG ("binding text domain %s to locale dir %s", GETTEXT_PACKAGE,
LOCALEDIR);
bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
#endif /* ENABLE_NLS */
return gst_element_register (plugin, "decodebin", GST_RANK_NONE,
GST_TYPE_DECODE_BIN);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"decodebin",
"decoder bin", plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME,
GST_PACKAGE_ORIGIN)
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