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gstreamer/gst-libs/gst/pbutils/gstdiscoverer.c
Arun Raghavan 19d4a5ab4d discoverer: Documentation updates 
Some cosmetic changes and expands on some bits of the documentation to
make it more newbie-friendly.
2011-01-06 15:33:14 +01:00

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/* GStreamer
* Copyright (C) 2009 Edward Hervey <edward.hervey@collabora.co.uk>
* 2009 Nokia Corporation
*
* 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:gstdiscoverer
* @short_description: Utility for discovering information on URIs.
*
* The #GstDiscoverer is a utility object which allows to get as much
* information as possible from one or many URIs.
*
* It provides two APIs, allowing usage in blocking or non-blocking mode.
*
* The blocking mode just requires calling gst_discoverer_discover_uri()
* with the URI one wishes to discover.
*
* The non-blocking mode requires a running #GMainLoop in the default
* #GMainContext, where one connects to the various signals, appends the
* URIs to be processed (through gst_discoverer_discover_uri_async()) and then
* asks for the discovery to begin (through gst_discoverer_start()).
*
* All the information is returned in a #GstDiscovererInfo structure.
*
* Since: 0.10.31
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/video/video.h>
#include "pbutils.h"
#include "pbutils-marshal.h"
#include "pbutils-private.h"
GST_DEBUG_CATEGORY_STATIC (discoverer_debug);
#define GST_CAT_DEFAULT discoverer_debug
static GQuark _CAPS_QUARK;
static GQuark _TAGS_QUARK;
static GQuark _MISSING_PLUGIN_QUARK;
static GQuark _STREAM_TOPOLOGY_QUARK;
static GQuark _TOPOLOGY_PAD_QUARK;
typedef struct
{
GstDiscoverer *dc;
GstPad *pad;
GstElement *queue;
GstElement *sink;
GstTagList *tags;
} PrivateStream;
struct _GstDiscovererPrivate
{
gboolean async;
/* allowed time to discover each uri in nanoseconds */
GstClockTime timeout;
/* list of pending URI to process (current excluded) */
GList *pending_uris;
GMutex *lock;
/* TRUE if processing a URI */
gboolean processing;
/* TRUE if discoverer has been started */
gboolean running;
/* current items */
GstDiscovererInfo *current_info;
GError *current_error;
GstStructure *current_topology;
/* List of private streams */
GList *streams;
/* Global elements */
GstBin *pipeline;
GstElement *uridecodebin;
GstBus *bus;
GType decodebin2_type;
/* Custom main context variables */
GMainContext *ctx;
guint sourceid;
guint timeoutid;
/* reusable queries */
GstQuery *seeking_query;
};
#define DISCO_LOCK(dc) g_mutex_lock (dc->priv->lock);
#define DISCO_UNLOCK(dc) g_mutex_unlock (dc->priv->lock);
static void
_do_init (void)
{
GST_DEBUG_CATEGORY_INIT (discoverer_debug, "discoverer", 0, "Discoverer");
_CAPS_QUARK = g_quark_from_static_string ("caps");
_TAGS_QUARK = g_quark_from_static_string ("tags");
_MISSING_PLUGIN_QUARK = g_quark_from_static_string ("missing-plugin");
_STREAM_TOPOLOGY_QUARK = g_quark_from_static_string ("stream-topology");
_TOPOLOGY_PAD_QUARK = g_quark_from_static_string ("pad");
};
G_DEFINE_TYPE_EXTENDED (GstDiscoverer, gst_discoverer, G_TYPE_OBJECT, 0,
_do_init ());
enum
{
SIGNAL_FINISHED,
SIGNAL_STARTING,
SIGNAL_DISCOVERED,
LAST_SIGNAL
};
#define DEFAULT_PROP_TIMEOUT 15 * GST_SECOND
enum
{
PROP_0,
PROP_TIMEOUT
};
static guint gst_discoverer_signals[LAST_SIGNAL] = { 0 };
static void gst_discoverer_set_timeout (GstDiscoverer * dc,
GstClockTime timeout);
static gboolean async_timeout_cb (GstDiscoverer * dc);
static void discoverer_bus_cb (GstBus * bus, GstMessage * msg,
GstDiscoverer * dc);
static void uridecodebin_pad_added_cb (GstElement * uridecodebin, GstPad * pad,
GstDiscoverer * dc);
static void uridecodebin_pad_removed_cb (GstElement * uridecodebin,
GstPad * pad, GstDiscoverer * dc);
static void gst_discoverer_dispose (GObject * dc);
static void gst_discoverer_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_discoverer_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void
gst_discoverer_class_init (GstDiscovererClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
gobject_class->dispose = gst_discoverer_dispose;
gobject_class->set_property = gst_discoverer_set_property;
gobject_class->get_property = gst_discoverer_get_property;
g_type_class_add_private (klass, sizeof (GstDiscovererPrivate));
/* properties */
/**
* GstDiscoverer:timeout
*
* The duration (in nanoseconds) after which the discovery of an individual
* URI will timeout.
*
* If the discovery of a URI times out, the %GST_DISCOVERER_TIMEOUT will be
* set on the result flags.
*/
g_object_class_install_property (gobject_class, PROP_TIMEOUT,
g_param_spec_uint64 ("timeout", "timeout", "Timeout",
GST_SECOND, 3600 * GST_SECOND, DEFAULT_PROP_TIMEOUT,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
/* signals */
/**
* GstDiscoverer::finished:
* @discoverer: the #GstDiscoverer
*
* Will be emitted when all pending URIs have been processed.
*/
gst_discoverer_signals[SIGNAL_FINISHED] =
g_signal_new ("finished", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstDiscovererClass, finished),
NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0, G_TYPE_NONE);
/**
* GstDiscoverer::starting:
* @discoverer: the #GstDiscoverer
*
* Will be emitted when the discover starts analyzing the pending URIs
*/
gst_discoverer_signals[SIGNAL_STARTING] =
g_signal_new ("starting", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstDiscovererClass, starting),
NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0, G_TYPE_NONE);
/**
* GstDiscoverer::discovered:
* @discoverer: the #GstDiscoverer
* @info: the results #GstDiscovererInfo
* @error: (type GLib.Error): #GError, which will be non-NULL if an error
* occurred during discovery
*
* Will be emitted when all information on a URI could be discovered.
*/
gst_discoverer_signals[SIGNAL_DISCOVERED] =
g_signal_new ("discovered", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstDiscovererClass, discovered),
NULL, NULL, pbutils_marshal_VOID__POINTER_BOXED,
G_TYPE_NONE, 2, GST_TYPE_DISCOVERER_INFO, GST_TYPE_G_ERROR);
}
static void
uridecodebin_element_added_cb (GstElement * uridecodebin,
GstElement * child, GstDiscoverer * dc)
{
GST_DEBUG ("New element added to uridecodebin : %s",
GST_ELEMENT_NAME (child));
if (G_OBJECT_TYPE (child) == dc->priv->decodebin2_type) {
g_object_set (child, "post-stream-topology", TRUE, NULL);
}
}
static void
gst_discoverer_init (GstDiscoverer * dc)
{
GstElement *tmp;
GstFormat format = GST_FORMAT_TIME;
dc->priv = G_TYPE_INSTANCE_GET_PRIVATE (dc, GST_TYPE_DISCOVERER,
GstDiscovererPrivate);
dc->priv->timeout = DEFAULT_PROP_TIMEOUT;
dc->priv->async = FALSE;
dc->priv->lock = g_mutex_new ();
GST_LOG ("Creating pipeline");
dc->priv->pipeline = (GstBin *) gst_pipeline_new ("Discoverer");
GST_LOG_OBJECT (dc, "Creating uridecodebin");
dc->priv->uridecodebin =
gst_element_factory_make ("uridecodebin", "discoverer-uri");
if (G_UNLIKELY (dc->priv->uridecodebin == NULL)) {
GST_ERROR ("Can't create uridecodebin");
return;
}
GST_LOG_OBJECT (dc, "Adding uridecodebin to pipeline");
gst_bin_add (dc->priv->pipeline, dc->priv->uridecodebin);
g_signal_connect (dc->priv->uridecodebin, "pad-added",
G_CALLBACK (uridecodebin_pad_added_cb), dc);
g_signal_connect (dc->priv->uridecodebin, "pad-removed",
G_CALLBACK (uridecodebin_pad_removed_cb), dc);
GST_LOG_OBJECT (dc, "Getting pipeline bus");
dc->priv->bus = gst_pipeline_get_bus ((GstPipeline *) dc->priv->pipeline);
g_signal_connect (dc->priv->bus, "message", G_CALLBACK (discoverer_bus_cb),
dc);
GST_DEBUG_OBJECT (dc, "Done initializing Discoverer");
/* This is ugly. We get the GType of decodebin2 so we can quickly detect
* when a decodebin2 is added to uridecodebin so we can set the
* post-stream-topology setting to TRUE */
g_signal_connect (dc->priv->uridecodebin, "element-added",
G_CALLBACK (uridecodebin_element_added_cb), dc);
tmp = gst_element_factory_make ("decodebin2", NULL);
dc->priv->decodebin2_type = G_OBJECT_TYPE (tmp);
gst_object_unref (tmp);
/* create queries */
dc->priv->seeking_query = gst_query_new_seeking (format);
}
static void
discoverer_reset (GstDiscoverer * dc)
{
GST_DEBUG_OBJECT (dc, "Resetting");
if (dc->priv->pending_uris) {
g_list_foreach (dc->priv->pending_uris, (GFunc) g_free, NULL);
g_list_free (dc->priv->pending_uris);
dc->priv->pending_uris = NULL;
}
gst_element_set_state ((GstElement *) dc->priv->pipeline, GST_STATE_NULL);
}
static void
gst_discoverer_dispose (GObject * obj)
{
GstDiscoverer *dc = (GstDiscoverer *) obj;
GST_DEBUG_OBJECT (dc, "Disposing");
discoverer_reset (dc);
if (G_LIKELY (dc->priv->pipeline)) {
/* pipeline was set to NULL in _reset */
gst_object_unref (dc->priv->pipeline);
gst_object_unref (dc->priv->bus);
dc->priv->pipeline = NULL;
dc->priv->uridecodebin = NULL;
dc->priv->bus = NULL;
}
if (dc->priv->lock) {
g_mutex_free (dc->priv->lock);
dc->priv->lock = NULL;
}
if (dc->priv->seeking_query) {
gst_query_unref (dc->priv->seeking_query);
dc->priv->seeking_query = NULL;
}
}
static void
gst_discoverer_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstDiscoverer *dc = (GstDiscoverer *) object;
switch (prop_id) {
case PROP_TIMEOUT:
gst_discoverer_set_timeout (dc, g_value_get_uint64 (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_discoverer_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstDiscoverer *dc = (GstDiscoverer *) object;
switch (prop_id) {
case PROP_TIMEOUT:
DISCO_LOCK (dc);
g_value_set_uint64 (value, dc->priv->timeout);
DISCO_UNLOCK (dc);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_discoverer_set_timeout (GstDiscoverer * dc, GstClockTime timeout)
{
GST_DEBUG_OBJECT (dc, "timeout : %" GST_TIME_FORMAT, GST_TIME_ARGS (timeout));
/* FIXME : update current pending timeout if we're running */
DISCO_LOCK (dc);
dc->priv->timeout = timeout;
DISCO_UNLOCK (dc);
}
static gboolean
_event_probe (GstPad * pad, GstEvent * event, PrivateStream * ps)
{
if (GST_EVENT_TYPE (event) == GST_EVENT_TAG) {
GstTagList *tl = NULL, *tmp;
gst_event_parse_tag (event, &tl);
GST_DEBUG_OBJECT (pad, "tags %" GST_PTR_FORMAT, tl);
DISCO_LOCK (ps->dc);
tmp = gst_tag_list_merge (ps->tags, tl, GST_TAG_MERGE_APPEND);
if (ps->tags)
gst_tag_list_free (ps->tags);
ps->tags = tmp;
DISCO_UNLOCK (ps->dc);
}
return TRUE;
}
static void
uridecodebin_pad_added_cb (GstElement * uridecodebin, GstPad * pad,
GstDiscoverer * dc)
{
PrivateStream *ps;
GstPad *sinkpad = NULL;
GST_DEBUG_OBJECT (dc, "pad %s:%s", GST_DEBUG_PAD_NAME (pad));
ps = g_slice_new0 (PrivateStream);
ps->dc = dc;
ps->pad = pad;
ps->queue = gst_element_factory_make ("queue", NULL);
ps->sink = gst_element_factory_make ("fakesink", NULL);
if (G_UNLIKELY (ps->queue == NULL || ps->sink == NULL))
goto error;
g_object_set (ps->sink, "silent", TRUE, NULL);
g_object_set (ps->queue, "max-size-buffers", 1, "silent", TRUE, NULL);
gst_bin_add_many (dc->priv->pipeline, ps->queue, ps->sink, NULL);
if (!gst_element_link_pads_full (ps->queue, "src", ps->sink, "sink",
GST_PAD_LINK_CHECK_NOTHING))
goto error;
if (!gst_element_sync_state_with_parent (ps->sink))
goto error;
if (!gst_element_sync_state_with_parent (ps->queue))
goto error;
sinkpad = gst_element_get_static_pad (ps->queue, "sink");
if (sinkpad == NULL)
goto error;
if (gst_pad_link_full (pad, sinkpad,
GST_PAD_LINK_CHECK_NOTHING) != GST_PAD_LINK_OK)
goto error;
gst_object_unref (sinkpad);
/* Add an event probe */
gst_pad_add_event_probe (pad, G_CALLBACK (_event_probe), ps);
DISCO_LOCK (dc);
dc->priv->streams = g_list_append (dc->priv->streams, ps);
DISCO_UNLOCK (dc);
GST_DEBUG_OBJECT (dc, "Done handling pad");
return;
error:
GST_ERROR_OBJECT (dc, "Error while handling pad");
if (sinkpad)
gst_object_unref (sinkpad);
if (ps->queue)
gst_object_unref (ps->queue);
if (ps->sink)
gst_object_unref (ps->sink);
g_slice_free (PrivateStream, ps);
return;
}
static void
uridecodebin_pad_removed_cb (GstElement * uridecodebin, GstPad * pad,
GstDiscoverer * dc)
{
GList *tmp;
PrivateStream *ps;
GstPad *sinkpad;
GST_DEBUG_OBJECT (dc, "pad %s:%s", GST_DEBUG_PAD_NAME (pad));
/* Find the PrivateStream */
DISCO_LOCK (dc);
for (tmp = dc->priv->streams; tmp; tmp = tmp->next) {
ps = (PrivateStream *) tmp->data;
if (ps->pad == pad)
break;
}
if (tmp == NULL) {
DISCO_UNLOCK (dc);
GST_DEBUG ("The removed pad wasn't controlled by us !");
return;
}
dc->priv->streams = g_list_delete_link (dc->priv->streams, tmp);
DISCO_UNLOCK (dc);
gst_element_set_state (ps->sink, GST_STATE_NULL);
gst_element_set_state (ps->queue, GST_STATE_NULL);
gst_element_unlink (ps->queue, ps->sink);
sinkpad = gst_element_get_static_pad (ps->queue, "sink");
gst_pad_unlink (pad, sinkpad);
gst_object_unref (sinkpad);
/* references removed here */
gst_bin_remove_many (dc->priv->pipeline, ps->sink, ps->queue, NULL);
if (ps->tags) {
gst_tag_list_free (ps->tags);
}
g_slice_free (PrivateStream, ps);
GST_DEBUG ("Done handling pad");
}
static GstStructure *
collect_stream_information (GstDiscoverer * dc, PrivateStream * ps, guint idx)
{
GstCaps *caps;
GstStructure *st;
gchar *stname;
stname = g_strdup_printf ("stream-%02d", idx);
st = gst_structure_empty_new (stname);
g_free (stname);
/* Get caps */
caps = gst_pad_get_negotiated_caps (ps->pad);
if (!caps) {
GST_WARNING ("Couldn't get negotiated caps from %s:%s",
GST_DEBUG_PAD_NAME (ps->pad));
caps = gst_pad_get_caps (ps->pad);
}
if (caps) {
GST_DEBUG ("Got caps %" GST_PTR_FORMAT, caps);
gst_structure_id_set (st, _CAPS_QUARK, GST_TYPE_CAPS, caps, NULL);
gst_caps_unref (caps);
}
if (ps->tags)
gst_structure_id_set (st, _TAGS_QUARK, GST_TYPE_STRUCTURE, ps->tags, NULL);
return st;
}
/* Parses a set of caps and tags in st and populates a GstDiscovererStreamInfo
* structure (parent, if !NULL, otherwise it allocates one)
*/
static GstDiscovererStreamInfo *
collect_information (GstDiscoverer * dc, const GstStructure * st,
GstDiscovererStreamInfo * parent)
{
GstCaps *caps;
GstStructure *caps_st, *tags_st;
const gchar *name;
int tmp, tmp2;
guint utmp;
gboolean btmp;
if (!st || !gst_structure_id_has_field (st, _CAPS_QUARK)) {
GST_WARNING ("Couldn't find caps !");
if (parent)
return parent;
else
return (GstDiscovererStreamInfo *)
gst_mini_object_new (GST_TYPE_DISCOVERER_STREAM_INFO);
}
gst_structure_id_get (st, _CAPS_QUARK, GST_TYPE_CAPS, &caps, NULL);
caps_st = gst_caps_get_structure (caps, 0);
name = gst_structure_get_name (caps_st);
if (g_str_has_prefix (name, "audio/")) {
GstDiscovererAudioInfo *info;
if (parent)
info = (GstDiscovererAudioInfo *) parent;
else {
info = (GstDiscovererAudioInfo *)
gst_mini_object_new (GST_TYPE_DISCOVERER_AUDIO_INFO);
info->parent.caps = caps;
}
if (gst_structure_get_int (caps_st, "rate", &tmp))
info->sample_rate = (guint) tmp;
if (gst_structure_get_int (caps_st, "channels", &tmp))
info->channels = (guint) tmp;
if (gst_structure_get_int (caps_st, "depth", &tmp))
info->depth = (guint) tmp;
if (gst_structure_id_has_field (st, _TAGS_QUARK)) {
gst_structure_id_get (st, _TAGS_QUARK,
GST_TYPE_STRUCTURE, &tags_st, NULL);
if (gst_structure_get_uint (tags_st, GST_TAG_BITRATE, &utmp))
info->bitrate = utmp;
if (gst_structure_get_uint (tags_st, GST_TAG_MAXIMUM_BITRATE, &utmp))
info->max_bitrate = utmp;
/* FIXME: Is it worth it to remove the tags we've parsed? */
info->parent.tags = gst_tag_list_merge (info->parent.tags,
(GstTagList *) tags_st, GST_TAG_MERGE_REPLACE);
gst_structure_free (tags_st);
}
return (GstDiscovererStreamInfo *) info;
} else if (g_str_has_prefix (name, "video/") ||
g_str_has_prefix (name, "image/")) {
GstDiscovererVideoInfo *info;
GstVideoFormat format;
if (parent)
info = (GstDiscovererVideoInfo *) parent;
else {
info = (GstDiscovererVideoInfo *)
gst_mini_object_new (GST_TYPE_DISCOVERER_VIDEO_INFO);
info->parent.caps = caps;
}
if (gst_video_format_parse_caps (caps, &format, &tmp, &tmp2)) {
info->width = (guint) tmp;
info->height = (guint) tmp2;
}
if (gst_structure_get_int (caps_st, "depth", &tmp))
info->depth = (guint) tmp;
if (gst_video_parse_caps_pixel_aspect_ratio (caps, &tmp, &tmp2)) {
info->par_num = tmp;
info->par_denom = tmp2;
}
if (gst_video_parse_caps_framerate (caps, &tmp, &tmp2)) {
info->framerate_num = tmp;
info->framerate_denom = tmp2;
}
if (gst_video_format_parse_caps_interlaced (caps, &btmp))
info->interlaced = btmp;
if (gst_structure_id_has_field (st, _TAGS_QUARK)) {
gst_structure_id_get (st, _TAGS_QUARK,
GST_TYPE_STRUCTURE, &tags_st, NULL);
if (gst_structure_get_uint (tags_st, GST_TAG_BITRATE, &utmp))
info->bitrate = utmp;
if (gst_structure_get_uint (tags_st, GST_TAG_MAXIMUM_BITRATE, &utmp))
info->max_bitrate = utmp;
/* FIXME: Is it worth it to remove the tags we've parsed? */
info->parent.tags = gst_tag_list_merge (info->parent.tags,
(GstTagList *) tags_st, GST_TAG_MERGE_REPLACE);
gst_structure_free (tags_st);
}
return (GstDiscovererStreamInfo *) info;
} else {
/* None of the above - populate what information we can */
GstDiscovererStreamInfo *info;
if (parent)
info = parent;
else {
info = (GstDiscovererStreamInfo *)
gst_mini_object_new (GST_TYPE_DISCOVERER_STREAM_INFO);
info->caps = caps;
}
if (gst_structure_id_get (st, _TAGS_QUARK,
GST_TYPE_STRUCTURE, &tags_st, NULL)) {
info->tags = gst_tag_list_merge (info->tags, (GstTagList *) tags_st,
GST_TAG_MERGE_REPLACE);
gst_structure_free (tags_st);
}
return info;
}
}
static GstStructure *
find_stream_for_node (GstDiscoverer * dc, const GstStructure * topology)
{
GstPad *pad;
GstPad *target_pad = NULL;
GstStructure *st = NULL;
PrivateStream *ps;
guint i;
GList *tmp;
if (!gst_structure_id_has_field (topology, _TOPOLOGY_PAD_QUARK)) {
GST_DEBUG ("Could not find pad for node %" GST_PTR_FORMAT "\n", topology);
return NULL;
}
gst_structure_id_get (topology, _TOPOLOGY_PAD_QUARK,
GST_TYPE_PAD, &pad, NULL);
if (!dc->priv->streams)
return NULL;
for (i = 0, tmp = dc->priv->streams; tmp; tmp = tmp->next, i++) {
ps = (PrivateStream *) tmp->data;
target_pad = gst_ghost_pad_get_target (GST_GHOST_PAD (ps->pad));
gst_object_unref (target_pad);
if (target_pad == pad)
break;
}
if (tmp)
st = collect_stream_information (dc, ps, i);
gst_object_unref (pad);
return st;
}
static gboolean
child_is_raw_stream (GstCaps * parent, GstCaps * child)
{
GstStructure *st1, *st2;
const gchar *name1, *name2;
st1 = gst_caps_get_structure (parent, 0);
name1 = gst_structure_get_name (st1);
st2 = gst_caps_get_structure (child, 0);
name2 = gst_structure_get_name (st2);
if ((g_str_has_prefix (name1, "audio/") &&
g_str_has_prefix (name2, "audio/x-raw")) ||
((g_str_has_prefix (name1, "video/") ||
g_str_has_prefix (name1, "image/")) &&
g_str_has_prefix (name2, "video/x-raw"))) {
/* child is the "raw" sub-stream corresponding to parent */
return TRUE;
}
return FALSE;
}
/* If a parent is non-NULL, collected stream information will be appended to it
* (and where the information exists, it will be overriden)
*/
static GstDiscovererStreamInfo *
parse_stream_topology (GstDiscoverer * dc, const GstStructure * topology,
GstDiscovererStreamInfo * parent)
{
GstDiscovererStreamInfo *res = NULL;
GstCaps *caps = NULL;
const GValue *nval = NULL;
GST_DEBUG ("parsing: %" GST_PTR_FORMAT, topology);
nval = gst_structure_get_value (topology, "next");
if (nval == NULL || GST_VALUE_HOLDS_STRUCTURE (nval)) {
GstStructure *st = find_stream_for_node (dc, topology);
gboolean add_to_list = TRUE;
if (st) {
res = collect_information (dc, st, parent);
gst_structure_free (st);
} else {
/* Didn't find a stream structure, so let's just use the caps we have */
res = collect_information (dc, topology, parent);
}
if (nval == NULL) {
/* FIXME : aggregate with information from main streams */
GST_DEBUG ("Coudn't find 'next' ! might be the last entry");
} else {
GstCaps *caps;
const GstStructure *st;
st = gst_value_get_structure (nval);
GST_DEBUG ("next is a structure %" GST_PTR_FORMAT, st);
if (!parent)
parent = res;
if (gst_structure_id_get (st, _CAPS_QUARK, GST_TYPE_CAPS, &caps, NULL)) {
if (gst_caps_can_intersect (parent->caps, caps)) {
/* We sometimes get an extra sub-stream from the parser. If this is
* the case, we just replace the parent caps with this stream's caps
* since they might contain more information */
gst_caps_unref (parent->caps);
parent->caps = caps;
parse_stream_topology (dc, st, parent);
add_to_list = FALSE;
} else if (child_is_raw_stream (parent->caps, caps)) {
/* This is the "raw" stream corresponding to the parent. This
* contains more information than the parent, tags etc. */
parse_stream_topology (dc, st, parent);
add_to_list = FALSE;
gst_caps_unref (caps);
} else {
GstDiscovererStreamInfo *next = parse_stream_topology (dc, st, NULL);
res->next = next;
next->previous = res;
}
}
}
if (add_to_list) {
dc->priv->current_info->stream_list =
g_list_append (dc->priv->current_info->stream_list, res);
}
} else if (GST_VALUE_HOLDS_LIST (nval)) {
guint i, len;
GstDiscovererContainerInfo *cont;
GstTagList *tags;
if (!gst_structure_id_get (topology, _CAPS_QUARK,
GST_TYPE_CAPS, &caps, NULL))
GST_WARNING ("Couldn't find caps !");
len = gst_value_list_get_size (nval);
GST_DEBUG ("next is a list of %d entries", len);
cont = (GstDiscovererContainerInfo *)
gst_mini_object_new (GST_TYPE_DISCOVERER_CONTAINER_INFO);
cont->parent.caps = caps;
res = (GstDiscovererStreamInfo *) cont;
if (gst_structure_id_has_field (topology, _TAGS_QUARK)) {
gst_structure_id_get (topology, _TAGS_QUARK,
GST_TYPE_STRUCTURE, &tags, NULL);
cont->parent.tags =
gst_tag_list_merge (cont->parent.tags, (GstTagList *) tags,
GST_TAG_MERGE_APPEND);
gst_tag_list_free (tags);
}
for (i = 0; i < len; i++) {
const GValue *subv = gst_value_list_get_value (nval, i);
const GstStructure *subst = gst_value_get_structure (subv);
GstDiscovererStreamInfo *substream;
GST_DEBUG ("%d %" GST_PTR_FORMAT, i, subst);
substream = parse_stream_topology (dc, subst, NULL);
substream->previous = res;
cont->streams =
g_list_append (cont->streams,
gst_discoverer_stream_info_ref (substream));
}
}
return res;
}
/* Called when pipeline is pre-rolled */
static void
discoverer_collect (GstDiscoverer * dc)
{
GST_DEBUG ("Collecting information");
/* Stop the timeout handler if present */
if (dc->priv->timeoutid) {
g_source_remove (dc->priv->timeoutid);
dc->priv->timeoutid = 0;
}
if (dc->priv->streams) {
/* FIXME : Make this querying optional */
if (TRUE) {
GstElement *pipeline = (GstElement *) dc->priv->pipeline;
GstFormat format = GST_FORMAT_TIME;
gint64 dur;
GST_DEBUG ("Attempting to query duration");
if (gst_element_query_duration (pipeline, &format, &dur)) {
if (format == GST_FORMAT_TIME) {
GST_DEBUG ("Got duration %" GST_TIME_FORMAT, GST_TIME_ARGS (dur));
dc->priv->current_info->duration = (guint64) dur;
}
}
if (dc->priv->seeking_query) {
if (gst_element_query (pipeline, dc->priv->seeking_query)) {
gboolean seekable;
gst_query_parse_seeking (dc->priv->seeking_query, &format,
&seekable, NULL, NULL);
if (format == GST_FORMAT_TIME) {
GST_DEBUG ("Got seekable %d", seekable);
dc->priv->current_info->seekable = seekable;
}
}
}
}
if (dc->priv->current_topology)
dc->priv->current_info->stream_info = parse_stream_topology (dc,
dc->priv->current_topology, NULL);
/*
* Images need some special handling. They do not have a duration, have
* caps named image/<foo> (th exception being MJPEG video which is also
* type image/jpeg), and should consist of precisely one stream (actually
* initially there are 2, the image and raw stream, but we squash these
* while parsing the stream topology). At some ponit, if we find that these
* conditions are not sufficient, we can count the number of decoders and
* parsers in the chain, and if there's more than one decoder, or any
* parser at all, we should not mark this as an image.
*/
if (dc->priv->current_info->duration == 0 &&
dc->priv->current_info->stream_info != NULL &&
dc->priv->current_info->stream_info->next == NULL) {
GstStructure *st =
gst_caps_get_structure (dc->priv->current_info->stream_info->caps, 0);
if (g_str_has_prefix (gst_structure_get_name (st), "image/"))
((GstDiscovererVideoInfo *) dc->priv->current_info->
stream_info)->is_image = TRUE;
}
}
if (dc->priv->async) {
GST_DEBUG ("Emitting 'discoverered'");
g_signal_emit (dc, gst_discoverer_signals[SIGNAL_DISCOVERED], 0,
dc->priv->current_info, dc->priv->current_error);
/* Clients get a copy of current_info since it is a boxed type */
gst_discoverer_info_unref (dc->priv->current_info);
}
}
static void
handle_current_async (GstDiscoverer * dc)
{
GSource *source;
/* Attach a timeout to the main context */
source = g_timeout_source_new (dc->priv->timeout / GST_MSECOND);
g_source_set_callback (source, (GSourceFunc) async_timeout_cb, dc, NULL);
dc->priv->timeoutid = g_source_attach (source, dc->priv->ctx);
g_source_unref (source);
}
/* Returns TRUE if processing should stop */
static gboolean
handle_message (GstDiscoverer * dc, GstMessage * msg)
{
gboolean done = FALSE;
GST_DEBUG ("got a %s message", GST_MESSAGE_TYPE_NAME (msg));
switch (GST_MESSAGE_TYPE (msg)) {
case GST_MESSAGE_ERROR:{
GError *gerr;
gchar *debug;
gst_message_parse_error (msg, &gerr, &debug);
GST_WARNING ("Got an error [debug:%s]", debug);
GST_WARNING ("Got an error [message:%s]", gerr->message);
dc->priv->current_error = gerr;
g_free (debug);
/* We need to stop */
done = TRUE;
GST_DEBUG ("Setting result to ERROR");
dc->priv->current_info->result = GST_DISCOVERER_ERROR;
}
break;
case GST_MESSAGE_EOS:
GST_DEBUG ("Got EOS !");
done = TRUE;
break;
case GST_MESSAGE_ASYNC_DONE:
if (GST_MESSAGE_SRC (msg) == (GstObject *) dc->priv->pipeline) {
GST_DEBUG ("Finished changing state asynchronously");
done = TRUE;
}
break;
case GST_MESSAGE_ELEMENT:
{
GQuark sttype = gst_structure_get_name_id (msg->structure);
GST_DEBUG_OBJECT (GST_MESSAGE_SRC (msg),
"structure %" GST_PTR_FORMAT, msg->structure);
if (sttype == _MISSING_PLUGIN_QUARK) {
GST_DEBUG ("Setting result to MISSING_PLUGINS");
dc->priv->current_info->result = GST_DISCOVERER_MISSING_PLUGINS;
dc->priv->current_info->misc = gst_structure_copy (msg->structure);
} else if (sttype == _STREAM_TOPOLOGY_QUARK) {
dc->priv->current_topology = gst_structure_copy (msg->structure);
}
}
break;
case GST_MESSAGE_TAG:
{
GstTagList *tl, *tmp;
gst_message_parse_tag (msg, &tl);
GST_DEBUG ("Got tags %" GST_PTR_FORMAT, tl);
/* Merge with current tags */
tmp =
gst_tag_list_merge (dc->priv->current_info->tags, tl,
GST_TAG_MERGE_APPEND);
gst_tag_list_free (tl);
if (dc->priv->current_info->tags)
gst_tag_list_free (dc->priv->current_info->tags);
dc->priv->current_info->tags = tmp;
}
break;
default:
break;
}
return done;
}
static void
handle_current_sync (GstDiscoverer * dc)
{
GTimer *timer;
gdouble deadline = ((gdouble) dc->priv->timeout) / GST_SECOND;
GstMessage *msg;
gboolean done = FALSE;
timer = g_timer_new ();
g_timer_start (timer);
do {
/* poll bus with timeout */
/* FIXME : make the timeout more fine-tuned */
if ((msg = gst_bus_timed_pop (dc->priv->bus, GST_SECOND / 2))) {
done = handle_message (dc, msg);
gst_message_unref (msg);
}
} while (!done && (g_timer_elapsed (timer, NULL) < deadline));
/* return result */
if (!done) {
GST_DEBUG ("we timed out! Setting result to TIMEOUT");
dc->priv->current_info->result = GST_DISCOVERER_TIMEOUT;
}
GST_DEBUG ("Done");
g_timer_stop (timer);
g_timer_destroy (timer);
}
static void
_setup_locked (GstDiscoverer * dc)
{
GstStateChangeReturn ret;
GST_DEBUG ("Setting up");
/* Pop URI off the pending URI list */
dc->priv->current_info =
(GstDiscovererInfo *) gst_mini_object_new (GST_TYPE_DISCOVERER_INFO);
dc->priv->current_info->uri = (gchar *) dc->priv->pending_uris->data;
dc->priv->pending_uris =
g_list_delete_link (dc->priv->pending_uris, dc->priv->pending_uris);
/* set uri on uridecodebin */
g_object_set (dc->priv->uridecodebin, "uri", dc->priv->current_info->uri,
NULL);
GST_DEBUG ("Current is now %s", dc->priv->current_info->uri);
dc->priv->processing = TRUE;
/* set pipeline to PAUSED */
DISCO_UNLOCK (dc);
GST_DEBUG ("Setting pipeline to PAUSED");
ret =
gst_element_set_state ((GstElement *) dc->priv->pipeline,
GST_STATE_PAUSED);
DISCO_LOCK (dc);
GST_DEBUG_OBJECT (dc, "Pipeline going to PAUSED : %s",
gst_element_state_change_return_get_name (ret));
}
static void
discoverer_cleanup (GstDiscoverer * dc)
{
GST_DEBUG ("Cleaning up");
gst_bus_set_flushing (dc->priv->bus, TRUE);
gst_element_set_state ((GstElement *) dc->priv->pipeline, GST_STATE_READY);
gst_bus_set_flushing (dc->priv->bus, FALSE);
DISCO_LOCK (dc);
if (dc->priv->current_error)
g_error_free (dc->priv->current_error);
dc->priv->current_error = NULL;
if (dc->priv->current_topology) {
gst_structure_free (dc->priv->current_topology);
dc->priv->current_topology = NULL;
}
dc->priv->current_info = NULL;
/* Try popping the next uri */
if (dc->priv->async) {
if (dc->priv->pending_uris != NULL) {
_setup_locked (dc);
DISCO_UNLOCK (dc);
/* Start timeout */
handle_current_async (dc);
} else {
/* We're done ! */
DISCO_UNLOCK (dc);
g_signal_emit (dc, gst_discoverer_signals[SIGNAL_FINISHED], 0);
}
} else
DISCO_UNLOCK (dc);
GST_DEBUG ("out");
}
static void
discoverer_bus_cb (GstBus * bus, GstMessage * msg, GstDiscoverer * dc)
{
if (dc->priv->processing) {
if (handle_message (dc, msg)) {
GST_DEBUG ("Stopping asynchronously");
dc->priv->processing = FALSE;
discoverer_collect (dc);
discoverer_cleanup (dc);
}
}
}
static gboolean
async_timeout_cb (GstDiscoverer * dc)
{
dc->priv->timeoutid = 0;
GST_DEBUG ("Setting result to TIMEOUT");
dc->priv->current_info->result = GST_DISCOVERER_TIMEOUT;
dc->priv->processing = FALSE;
discoverer_collect (dc);
discoverer_cleanup (dc);
return FALSE;
}
/* If there is a pending URI, it will pop it from the list of pending
* URIs and start the discovery on it.
*
* Returns GST_DISCOVERER_OK if the next URI was popped and is processing,
* else a error flag.
*/
static GstDiscovererResult
start_discovering (GstDiscoverer * dc)
{
GstDiscovererResult res = GST_DISCOVERER_OK;
GST_DEBUG ("Starting");
DISCO_LOCK (dc);
if (dc->priv->pending_uris == NULL) {
GST_WARNING ("No URI to process");
res = GST_DISCOVERER_URI_INVALID;
DISCO_UNLOCK (dc);
goto beach;
}
if (dc->priv->current_info != NULL) {
GST_WARNING ("Already processing a file");
res = GST_DISCOVERER_BUSY;
DISCO_UNLOCK (dc);
goto beach;
}
g_signal_emit (dc, gst_discoverer_signals[SIGNAL_STARTING], 0);
_setup_locked (dc);
DISCO_UNLOCK (dc);
if (dc->priv->async)
handle_current_async (dc);
else
handle_current_sync (dc);
beach:
return res;
}
/**
* gst_discoverer_start:
* @discoverer: A #GstDiscoverer
*
* Allow asynchronous discovering of URIs to take place.
* A #GMainLoop must be available for #GstDiscoverer to properly work in
* asynchronous mode.
*
* Since: 0.10.31
*/
void
gst_discoverer_start (GstDiscoverer * discoverer)
{
GSource *source;
GMainContext *ctx = NULL;
GST_DEBUG_OBJECT (discoverer, "Starting...");
if (discoverer->priv->async) {
GST_DEBUG_OBJECT (discoverer, "We were already started");
return;
}
discoverer->priv->async = TRUE;
discoverer->priv->running = TRUE;
ctx = g_main_context_get_thread_default ();
/* Connect to bus signals */
if (ctx == NULL)
ctx = g_main_context_default ();
source = gst_bus_create_watch (discoverer->priv->bus);
g_source_set_callback (source, (GSourceFunc) gst_bus_async_signal_func,
NULL, NULL);
discoverer->priv->sourceid = g_source_attach (source, ctx);
g_source_unref (source);
discoverer->priv->ctx = g_main_context_ref (ctx);
start_discovering (discoverer);
GST_DEBUG_OBJECT (discoverer, "Started");
}
/**
* gst_discoverer_stop:
* @discoverer: A #GstDiscoverer
*
* Stop the discovery of any pending URIs and clears the list of
* pending URIS (if any).
*
* Since: 0.10.31
*/
void
gst_discoverer_stop (GstDiscoverer * discoverer)
{
GST_DEBUG_OBJECT (discoverer, "Stopping...");
if (!discoverer->priv->async) {
GST_DEBUG_OBJECT (discoverer,
"We were already stopped, or running synchronously");
return;
}
DISCO_LOCK (discoverer);
if (discoverer->priv->processing) {
/* We prevent any further processing by setting the bus to
* flushing and setting the pipeline to READY.
* _reset() will take care of the rest of the cleanup */
gst_bus_set_flushing (discoverer->priv->bus, TRUE);
gst_element_set_state ((GstElement *) discoverer->priv->pipeline,
GST_STATE_READY);
}
discoverer->priv->running = FALSE;
DISCO_UNLOCK (discoverer);
/* Remove timeout handler */
if (discoverer->priv->timeoutid) {
g_source_remove (discoverer->priv->timeoutid);
discoverer->priv->timeoutid = 0;
}
/* Remove signal watch */
if (discoverer->priv->sourceid) {
g_source_remove (discoverer->priv->sourceid);
discoverer->priv->sourceid = 0;
}
/* Unref main context */
if (discoverer->priv->ctx) {
g_main_context_unref (discoverer->priv->ctx);
discoverer->priv->ctx = NULL;
}
discoverer_reset (discoverer);
discoverer->priv->async = FALSE;
GST_DEBUG_OBJECT (discoverer, "Stopped");
}
/**
* gst_discoverer_discover_uri_async:
* @discoverer: A #GstDiscoverer
* @uri: the URI to add.
*
* Appends the given @uri to the list of URIs to discoverer. The actual
* discovery of the @uri will only take place if gst_discoverer_start() has
* been called.
*
* A copy of @uri will be made internally, so the caller can safely g_free()
* afterwards.
*
* Returns: %TRUE if the @uri was succesfully appended to the list of pending
* uris, else %FALSE
*
* Since: 0.10.31
*/
gboolean
gst_discoverer_discover_uri_async (GstDiscoverer * discoverer,
const gchar * uri)
{
gboolean can_run;
GST_DEBUG_OBJECT (discoverer, "uri : %s", uri);
DISCO_LOCK (discoverer);
can_run = (discoverer->priv->pending_uris == NULL);
discoverer->priv->pending_uris =
g_list_append (discoverer->priv->pending_uris, g_strdup (uri));
DISCO_UNLOCK (discoverer);
if (can_run)
start_discovering (discoverer);
return TRUE;
}
/* Synchronous mode */
/**
* gst_discoverer_discover_uri:
* @discoverer: A #GstDiscoverer
* @uri: The URI to run on.
* @err: If an error occurred, this field will be filled in.
*
* Synchronously discovers the given @uri.
*
* A copy of @uri will be made internally, so the caller can safely g_free()
* afterwards.
*
* Returns: (transfer full): the result of the scanning. Can be %NULL if an
* error occurred.
*
* Since: 0.10.31
*/
GstDiscovererInfo *
gst_discoverer_discover_uri (GstDiscoverer * discoverer, const gchar * uri,
GError ** err)
{
GstDiscovererResult res = 0;
GstDiscovererInfo *info;
GST_DEBUG_OBJECT (discoverer, "uri:%s", uri);
DISCO_LOCK (discoverer);
if (G_UNLIKELY (discoverer->priv->current_info)) {
DISCO_UNLOCK (discoverer);
GST_WARNING_OBJECT (discoverer, "Already handling a uri");
return NULL;
}
discoverer->priv->pending_uris =
g_list_append (discoverer->priv->pending_uris, g_strdup (uri));
DISCO_UNLOCK (discoverer);
res = start_discovering (discoverer);
discoverer_collect (discoverer);
/* Get results */
if (discoverer->priv->current_error)
*err = g_error_copy (discoverer->priv->current_error);
else
*err = NULL;
if (res != GST_DISCOVERER_OK) {
GST_DEBUG ("Setting result to %d (was %d)", res,
discoverer->priv->current_info->result);
discoverer->priv->current_info->result = res;
}
info = discoverer->priv->current_info;
discoverer_cleanup (discoverer);
return info;
}
/**
* gst_discoverer_new:
* @timeout: timeout per file, in nanoseconds. Allowed are values between
* one second (#GST_SECOND) and one hour (3600 * #GST_SECOND)
* @err: a pointer to a #GError. can be %NULL
*
* Creates a new #GstDiscoverer with the provided timeout.
*
* Returns: (transfer full): The new #GstDiscoverer.
* If an error occurred when creating the discoverer, @err will be set
* accordingly and %NULL will be returned. If @err is set, the caller must
* free it when no longer needed using g_error_free().
*
* Since: 0.10.31
*/
GstDiscoverer *
gst_discoverer_new (GstClockTime timeout, GError ** err)
{
GstDiscoverer *res;
res = g_object_new (GST_TYPE_DISCOVERER, "timeout", timeout, NULL);
if (res->priv->uridecodebin == NULL) {
if (err)
*err = g_error_new (GST_CORE_ERROR, GST_CORE_ERROR_MISSING_PLUGIN,
"Couldn't create 'uridecodebin' element");
gst_object_unref (res);
res = NULL;
}
return res;
}
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