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gstreamer/subprojects/gst-libav/ext/libav/gstavdemux.c
Devin Anderson 0812c753c6 gst-libav: Fix synchronization issues and errors created by the forwarding of 
segment events by demuxer.

In order to play nicely with `ffmpeg`, demuxers in `gst-libav` have to make
buffers available to `ffmpeg` while taking the blocking I/O model in `ffmpeg`
into account, which results in buffers not being sent downstream until `ffmpeg`
has processed them in its separate thread.

In constrast, many `gstreamer` events are simply forwarded downstream.
Currently `GST_EVENT_SEGMENT` events are forwarded downstream without any
processing, which can potentially result in:
 * `GST_EVENT_SEGMENT` events being out of sync with buffers
 * `GST_EVENT_SEGMENT` events going out that are incorrect because they apply
   to data seen by the demuxer, but not necessarily seen by downstream elements

I came across this bug when I was attempting to enable G723.1 demuxing/decoding
using the G723.1 demuxer and decoder provided by `ffmpeg`.  I wrote tests to
verify support for the functionality, and found that, in push mode,
`GST_EVENT_SEGMENT` events pushed to the demuxer by the upstream `filesrc`
element would be forwarded to the decoder without modification, resulting in
an internal data streaming error.  With this patch, tests work in both push and
pull mode.

This patch solves the problem by disabling the forwarding of
`GST_EVENT_SEGMENT` events downstream (an initial `GST_EVENT_SEGMENT` event is
still pushed downstream by the demuxer).  It's possible there's a better way to
do this, but, having looked at how a few different `gstreamer` demuxers deal
with `GST_EVENT_SEGMENT` events, it seems like the processing is somewhat
specific to the demuxer implementation, whereas `gst-libav` has one general way
of handling the situation for any `ffmpeg` demuxer.  Perhaps there's a better
way to solve this using the `ffmpeg` API to take advantage of specific demuxer
details.  IDK.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3218>
2022-10-21 23:17:58 +00:00

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>,
* <2006> Edward Hervey <bilboed@bilboed.com>
* <2006> Wim Taymans <wim@fluendo.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <libavformat/avformat.h>
#include <libavutil/imgutils.h>
/* #include <ffmpeg/avi.h> */
#include <gst/gst.h>
#include <gst/base/gstflowcombiner.h>
#include "gstav.h"
#include "gstavcodecmap.h"
#include "gstavutils.h"
#include "gstavprotocol.h"
#define MAX_STREAMS 20
typedef struct _GstFFMpegDemux GstFFMpegDemux;
typedef struct _GstFFStream GstFFStream;
struct _GstFFStream
{
GstPad *pad;
AVStream *avstream;
gboolean unknown;
GstClockTime last_ts;
gboolean discont;
gboolean eos;
GstTagList *tags; /* stream tags */
};
struct _GstFFMpegDemux
{
GstElement element;
/* We need to keep track of our pads, so we do so here. */
GstPad *sinkpad;
gboolean have_group_id;
guint group_id;
AVFormatContext *context;
gboolean opened;
GstFFStream *streams[MAX_STREAMS];
GstFlowCombiner *flowcombiner;
gint videopads, audiopads;
GstClockTime start_time;
GstClockTime duration;
/* TRUE if working in pull-mode */
gboolean seekable;
/* TRUE if the avformat demuxer can reliably handle streaming mode */
gboolean can_push;
gboolean flushing;
/* segment stuff */
GstSegment segment;
/* cached seek in READY */
GstEvent *seek_event;
/* cached upstream events */
GList *cached_events;
/* push mode data */
GstFFMpegPipe ffpipe;
GstTask *task;
GRecMutex task_lock;
};
typedef struct _GstFFMpegDemuxClass GstFFMpegDemuxClass;
struct _GstFFMpegDemuxClass
{
GstElementClass parent_class;
AVInputFormat *in_plugin;
GstPadTemplate *sinktempl;
GstPadTemplate *videosrctempl;
GstPadTemplate *audiosrctempl;
};
/* A number of function prototypes are given so we can refer to them later. */
static void gst_ffmpegdemux_class_init (GstFFMpegDemuxClass * klass);
static void gst_ffmpegdemux_base_init (GstFFMpegDemuxClass * klass);
static void gst_ffmpegdemux_init (GstFFMpegDemux * demux);
static void gst_ffmpegdemux_finalize (GObject * object);
static gboolean gst_ffmpegdemux_sink_event (GstPad * sinkpad,
GstObject * parent, GstEvent * event);
static GstFlowReturn gst_ffmpegdemux_chain (GstPad * sinkpad,
GstObject * parent, GstBuffer * buf);
static void gst_ffmpegdemux_loop (GstFFMpegDemux * demux);
static gboolean gst_ffmpegdemux_sink_activate (GstPad * sinkpad,
GstObject * parent);
static gboolean gst_ffmpegdemux_sink_activate_mode (GstPad * sinkpad,
GstObject * parent, GstPadMode mode, gboolean active);
static GstTagList *gst_ffmpeg_metadata_to_tag_list (AVDictionary * metadata);
#if 0
static gboolean
gst_ffmpegdemux_src_convert (GstPad * pad,
GstFormat src_fmt,
gint64 src_value, GstFormat * dest_fmt, gint64 * dest_value);
#endif
static gboolean
gst_ffmpegdemux_send_event (GstElement * element, GstEvent * event);
static GstStateChangeReturn
gst_ffmpegdemux_change_state (GstElement * element, GstStateChange transition);
#define GST_FFDEMUX_PARAMS_QDATA g_quark_from_static_string("avdemux-params")
static GstElementClass *parent_class = NULL;
static const gchar *
gst_ffmpegdemux_averror (gint av_errno)
{
const gchar *message = NULL;
switch (av_errno) {
case AVERROR (EINVAL):
message = "Unknown error";
break;
case AVERROR (EIO):
message = "Input/output error";
break;
case AVERROR (EDOM):
message = "Number syntax expected in filename";
break;
case AVERROR (ENOMEM):
message = "Not enough memory";
break;
case AVERROR (EILSEQ):
message = "Unknown format";
break;
case AVERROR (ENOSYS):
message = "Operation not supported";
break;
default:
message = "Unhandled error code received";
break;
}
return message;
}
static void
gst_ffmpegdemux_base_init (GstFFMpegDemuxClass * klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
AVInputFormat *in_plugin;
GstCaps *sinkcaps;
GstPadTemplate *sinktempl, *audiosrctempl, *videosrctempl;
gchar *longname, *description, *name;
in_plugin = (AVInputFormat *)
g_type_get_qdata (G_OBJECT_CLASS_TYPE (klass), GST_FFDEMUX_PARAMS_QDATA);
g_assert (in_plugin != NULL);
name = g_strdup (in_plugin->name);
g_strdelimit (name, ".,|-<> ", '_');
/* construct the element details struct */
longname = g_strdup_printf ("libav %s demuxer", in_plugin->long_name);
description = g_strdup_printf ("libav %s demuxer", in_plugin->long_name);
gst_element_class_set_metadata (element_class, longname,
"Codec/Demuxer", description,
"Wim Taymans <wim@fluendo.com>, "
"Ronald Bultje <rbultje@ronald.bitfreak.net>, "
"Edward Hervey <bilboed@bilboed.com>");
g_free (longname);
g_free (description);
/* pad templates */
sinkcaps = gst_ffmpeg_formatid_to_caps (name);
sinktempl = gst_pad_template_new ("sink",
GST_PAD_SINK, GST_PAD_ALWAYS, sinkcaps);
g_free (name);
videosrctempl = gst_pad_template_new ("video_%u",
GST_PAD_SRC, GST_PAD_SOMETIMES, GST_CAPS_ANY);
audiosrctempl = gst_pad_template_new ("audio_%u",
GST_PAD_SRC, GST_PAD_SOMETIMES, GST_CAPS_ANY);
gst_element_class_add_pad_template (element_class, videosrctempl);
gst_element_class_add_pad_template (element_class, audiosrctempl);
gst_element_class_add_pad_template (element_class, sinktempl);
gst_caps_unref (sinkcaps);
klass->in_plugin = in_plugin;
klass->videosrctempl = videosrctempl;
klass->audiosrctempl = audiosrctempl;
klass->sinktempl = sinktempl;
}
static void
gst_ffmpegdemux_class_init (GstFFMpegDemuxClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_ffmpegdemux_finalize);
gstelement_class->change_state = gst_ffmpegdemux_change_state;
gstelement_class->send_event = gst_ffmpegdemux_send_event;
}
static void
gst_ffmpegdemux_init (GstFFMpegDemux * demux)
{
GstFFMpegDemuxClass *oclass =
(GstFFMpegDemuxClass *) (G_OBJECT_GET_CLASS (demux));
gint n;
demux->sinkpad = gst_pad_new_from_template (oclass->sinktempl, "sink");
gst_pad_set_activate_function (demux->sinkpad,
GST_DEBUG_FUNCPTR (gst_ffmpegdemux_sink_activate));
gst_pad_set_activatemode_function (demux->sinkpad,
GST_DEBUG_FUNCPTR (gst_ffmpegdemux_sink_activate_mode));
gst_element_add_pad (GST_ELEMENT (demux), demux->sinkpad);
/* push based setup */
/* the following are not used in pull-based mode, so safe to set anyway */
gst_pad_set_event_function (demux->sinkpad,
GST_DEBUG_FUNCPTR (gst_ffmpegdemux_sink_event));
gst_pad_set_chain_function (demux->sinkpad,
GST_DEBUG_FUNCPTR (gst_ffmpegdemux_chain));
/* task for driving ffmpeg in loop function */
demux->task =
gst_task_new ((GstTaskFunction) gst_ffmpegdemux_loop, demux, NULL);
g_rec_mutex_init (&demux->task_lock);
gst_task_set_lock (demux->task, &demux->task_lock);
demux->have_group_id = FALSE;
demux->group_id = G_MAXUINT;
demux->opened = FALSE;
demux->context = NULL;
for (n = 0; n < MAX_STREAMS; n++) {
demux->streams[n] = NULL;
}
demux->videopads = 0;
demux->audiopads = 0;
demux->seek_event = NULL;
gst_segment_init (&demux->segment, GST_FORMAT_TIME);
demux->flowcombiner = gst_flow_combiner_new ();
/* push based data */
g_mutex_init (&demux->ffpipe.tlock);
g_cond_init (&demux->ffpipe.cond);
demux->ffpipe.adapter = gst_adapter_new ();
/* blacklist unreliable push-based demuxers */
if (strcmp (oclass->in_plugin->name, "ape"))
demux->can_push = TRUE;
else
demux->can_push = FALSE;
}
static void
gst_ffmpegdemux_finalize (GObject * object)
{
GstFFMpegDemux *demux;
demux = (GstFFMpegDemux *) object;
gst_flow_combiner_free (demux->flowcombiner);
g_mutex_clear (&demux->ffpipe.tlock);
g_cond_clear (&demux->ffpipe.cond);
gst_object_unref (demux->ffpipe.adapter);
gst_object_unref (demux->task);
g_rec_mutex_clear (&demux->task_lock);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_ffmpegdemux_close (GstFFMpegDemux * demux)
{
gint n;
GstEvent **event_p;
if (!demux->opened)
return;
/* remove pads from ourselves */
for (n = 0; n < MAX_STREAMS; n++) {
GstFFStream *stream;
stream = demux->streams[n];
if (stream) {
if (stream->pad) {
gst_flow_combiner_remove_pad (demux->flowcombiner, stream->pad);
gst_element_remove_pad (GST_ELEMENT (demux), stream->pad);
}
if (stream->tags)
gst_tag_list_unref (stream->tags);
g_free (stream);
}
demux->streams[n] = NULL;
}
demux->videopads = 0;
demux->audiopads = 0;
/* close demuxer context from ffmpeg */
if (demux->seekable)
gst_ffmpegdata_close (demux->context->pb);
else
gst_ffmpeg_pipe_close (demux->context->pb);
demux->context->pb = NULL;
avformat_close_input (&demux->context);
if (demux->context)
avformat_free_context (demux->context);
demux->context = NULL;
GST_OBJECT_LOCK (demux);
demux->opened = FALSE;
event_p = &demux->seek_event;
gst_event_replace (event_p, NULL);
GST_OBJECT_UNLOCK (demux);
gst_segment_init (&demux->segment, GST_FORMAT_TIME);
}
/* send an event to all the source pads .
* Takes ownership of the event.
*
* Returns FALSE if none of the source pads handled the event.
*/
static gboolean
gst_ffmpegdemux_push_event (GstFFMpegDemux * demux, GstEvent * event)
{
gboolean res;
gint n;
res = TRUE;
for (n = 0; n < MAX_STREAMS; n++) {
GstFFStream *s = demux->streams[n];
if (s && s->pad) {
gst_event_ref (event);
res &= gst_pad_push_event (s->pad, event);
}
}
gst_event_unref (event);
return res;
}
/* set flags on all streams */
static void
gst_ffmpegdemux_set_flags (GstFFMpegDemux * demux, gboolean discont,
gboolean eos)
{
GstFFStream *s;
gint n;
for (n = 0; n < MAX_STREAMS; n++) {
if ((s = demux->streams[n])) {
s->discont = discont;
s->eos = eos;
}
}
}
/* check if all streams are eos */
static gboolean
gst_ffmpegdemux_is_eos (GstFFMpegDemux * demux)
{
GstFFStream *s;
gint n;
for (n = 0; n < MAX_STREAMS; n++) {
if ((s = demux->streams[n])) {
GST_DEBUG ("stream %d %p eos:%d", n, s, s->eos);
if (!s->eos)
return FALSE;
}
}
return TRUE;
}
/* Returns True if we at least outputted one buffer */
static gboolean
gst_ffmpegdemux_has_outputted (GstFFMpegDemux * demux)
{
GstFFStream *s;
gint n;
for (n = 0; n < MAX_STREAMS; n++) {
if ((s = demux->streams[n])) {
if (GST_CLOCK_TIME_IS_VALID (s->last_ts))
return TRUE;
}
}
return FALSE;
}
static gboolean
gst_ffmpegdemux_do_seek (GstFFMpegDemux * demux, GstSegment * segment)
{
gboolean ret;
gint seekret;
gint64 target;
gint64 fftarget;
AVStream *stream;
gint index;
/* find default index and fail if none is present */
index = av_find_default_stream_index (demux->context);
GST_LOG_OBJECT (demux, "default stream index %d", index);
if (index < 0)
return FALSE;
ret = TRUE;
/* get the stream for seeking */
stream = demux->context->streams[index];
/* initial seek position */
target = segment->position + demux->start_time;
/* convert target to ffmpeg time */
fftarget = gst_ffmpeg_time_gst_to_ff (target, stream->time_base);
GST_LOG_OBJECT (demux, "do seek to time %" GST_TIME_FORMAT,
GST_TIME_ARGS (target));
/* if we need to land on a keyframe, try to do so, we don't try to do a
* keyframe seek if we are not absolutely sure we have an index.*/
if (segment->flags & GST_SEEK_FLAG_KEY_UNIT) {
gint keyframeidx;
GST_LOG_OBJECT (demux, "looking for keyframe in ffmpeg for time %"
GST_TIME_FORMAT, GST_TIME_ARGS (target));
/* search in the index for the previous keyframe */
keyframeidx =
av_index_search_timestamp (stream, fftarget, AVSEEK_FLAG_BACKWARD);
GST_LOG_OBJECT (demux, "keyframeidx: %d", keyframeidx);
if (keyframeidx >= 0) {
#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(58,78,0)
fftarget = avformat_index_get_entry (stream, keyframeidx)->timestamp;
#else
fftarget = stream->index_entries[keyframeidx].timestamp;
#endif
target = gst_ffmpeg_time_ff_to_gst (fftarget, stream->time_base);
GST_LOG_OBJECT (demux,
"Found a keyframe at ffmpeg idx: %d timestamp :%" GST_TIME_FORMAT,
keyframeidx, GST_TIME_ARGS (target));
}
}
GST_DEBUG_OBJECT (demux,
"About to call av_seek_frame (context, %d, %" G_GINT64_FORMAT
", 0) for time %" GST_TIME_FORMAT, index, fftarget,
GST_TIME_ARGS (target));
if ((seekret =
av_seek_frame (demux->context, index, fftarget,
AVSEEK_FLAG_BACKWARD)) < 0)
goto seek_failed;
GST_DEBUG_OBJECT (demux, "seek success, returned %d", seekret);
if (target > demux->start_time)
target -= demux->start_time;
else
target = 0;
segment->position = target;
segment->time = target;
segment->start = target;
return ret;
/* ERRORS */
seek_failed:
{
GST_WARNING_OBJECT (demux, "Call to av_seek_frame failed : %d", seekret);
return FALSE;
}
}
static gboolean
gst_ffmpegdemux_perform_seek (GstFFMpegDemux * demux, GstEvent * event)
{
gboolean res;
gdouble rate;
GstFormat format;
GstSeekFlags flags;
GstSeekType cur_type, stop_type;
gint64 cur, stop;
gboolean flush;
gboolean update;
GstSegment seeksegment;
if (!demux->seekable) {
GST_DEBUG_OBJECT (demux, "in push mode; ignoring seek");
return FALSE;
}
GST_DEBUG_OBJECT (demux, "starting seek");
if (event) {
gst_event_parse_seek (event, &rate, &format, &flags,
&cur_type, &cur, &stop_type, &stop);
/* we have to have a format as the segment format. Try to convert
* if not. */
if (demux->segment.format != format) {
GstFormat fmt;
fmt = demux->segment.format;
res = TRUE;
/* FIXME, use source pad */
if (cur_type != GST_SEEK_TYPE_NONE && cur != -1)
res = gst_pad_query_convert (demux->sinkpad, format, cur, fmt, &cur);
if (res && stop_type != GST_SEEK_TYPE_NONE && stop != -1)
res = gst_pad_query_convert (demux->sinkpad, format, stop, fmt, &stop);
if (!res)
goto no_format;
format = fmt;
}
} else {
flags = 0;
}
flush = flags & GST_SEEK_FLAG_FLUSH;
/* send flush start */
if (flush) {
/* mark flushing so that the streaming thread can react on it */
GST_OBJECT_LOCK (demux);
demux->flushing = TRUE;
GST_OBJECT_UNLOCK (demux);
gst_pad_push_event (demux->sinkpad, gst_event_new_flush_start ());
gst_ffmpegdemux_push_event (demux, gst_event_new_flush_start ());
} else {
gst_pad_pause_task (demux->sinkpad);
}
/* grab streaming lock, this should eventually be possible, either
* because the task is paused or our streaming thread stopped
* because our peer is flushing. */
GST_PAD_STREAM_LOCK (demux->sinkpad);
/* make copy into temp structure, we can only update the main one
* when we actually could do the seek. */
memcpy (&seeksegment, &demux->segment, sizeof (GstSegment));
/* now configure the seek segment */
if (event) {
gst_segment_do_seek (&seeksegment, rate, format, flags,
cur_type, cur, stop_type, stop, &update);
}
GST_DEBUG_OBJECT (demux, "segment configured from %" G_GINT64_FORMAT
" to %" G_GINT64_FORMAT ", position %" G_GINT64_FORMAT,
seeksegment.start, seeksegment.stop, seeksegment.position);
/* make the sinkpad available for data passing since we might need
* it when doing the seek */
if (flush) {
GST_OBJECT_LOCK (demux);
demux->flushing = FALSE;
GST_OBJECT_UNLOCK (demux);
gst_pad_push_event (demux->sinkpad, gst_event_new_flush_stop (TRUE));
}
/* do the seek, segment.position contains new position. */
res = gst_ffmpegdemux_do_seek (demux, &seeksegment);
/* and prepare to continue streaming */
if (flush) {
/* send flush stop, peer will accept data and events again. We
* are not yet providing data as we still have the STREAM_LOCK. */
gst_ffmpegdemux_push_event (demux, gst_event_new_flush_stop (TRUE));
}
/* if successfull seek, we update our real segment and push
* out the new segment. */
if (res) {
memcpy (&demux->segment, &seeksegment, sizeof (GstSegment));
if (demux->segment.flags & GST_SEEK_FLAG_SEGMENT) {
gst_element_post_message (GST_ELEMENT (demux),
gst_message_new_segment_start (GST_OBJECT (demux),
demux->segment.format, demux->segment.position));
}
/* now send the newsegment, FIXME, do this from the streaming thread */
GST_DEBUG_OBJECT (demux, "Sending newsegment %" GST_SEGMENT_FORMAT,
&demux->segment);
gst_ffmpegdemux_push_event (demux, gst_event_new_segment (&demux->segment));
}
/* Mark discont on all srcpads and remove eos */
gst_ffmpegdemux_set_flags (demux, TRUE, FALSE);
gst_flow_combiner_reset (demux->flowcombiner);
/* and restart the task in case it got paused explicitely or by
* the FLUSH_START event we pushed out. */
gst_pad_start_task (demux->sinkpad, (GstTaskFunction) gst_ffmpegdemux_loop,
demux->sinkpad, NULL);
/* and release the lock again so we can continue streaming */
GST_PAD_STREAM_UNLOCK (demux->sinkpad);
return res;
/* ERROR */
no_format:
{
GST_DEBUG_OBJECT (demux, "undefined format given, seek aborted.");
return FALSE;
}
}
static gboolean
gst_ffmpegdemux_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstFFMpegDemux *demux;
gboolean res = TRUE;
demux = (GstFFMpegDemux *) parent;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
res = gst_ffmpegdemux_perform_seek (demux, event);
gst_event_unref (event);
break;
case GST_EVENT_LATENCY:
res = gst_pad_push_event (demux->sinkpad, event);
break;
case GST_EVENT_NAVIGATION:
case GST_EVENT_QOS:
default:
res = FALSE;
gst_event_unref (event);
break;
}
return res;
}
static gboolean
gst_ffmpegdemux_send_event (GstElement * element, GstEvent * event)
{
GstFFMpegDemux *demux = (GstFFMpegDemux *) (element);
gboolean res;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
GST_OBJECT_LOCK (demux);
if (!demux->opened) {
GstEvent **event_p;
GST_DEBUG_OBJECT (demux, "caching seek event");
event_p = &demux->seek_event;
gst_event_replace (event_p, event);
GST_OBJECT_UNLOCK (demux);
res = TRUE;
} else {
GST_OBJECT_UNLOCK (demux);
res = gst_ffmpegdemux_perform_seek (demux, event);
gst_event_unref (event);
}
break;
default:
res = FALSE;
break;
}
return res;
}
static gboolean
gst_ffmpegdemux_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstFFMpegDemux *demux;
GstFFStream *stream;
AVStream *avstream;
gboolean res = FALSE;
if (!(stream = gst_pad_get_element_private (pad)))
return FALSE;
avstream = stream->avstream;
demux = (GstFFMpegDemux *) parent;
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_POSITION:
{
GstFormat format;
gint64 timeposition;
gst_query_parse_position (query, &format, NULL);
timeposition = stream->last_ts;
if (!(GST_CLOCK_TIME_IS_VALID (timeposition)))
break;
switch (format) {
case GST_FORMAT_TIME:
gst_query_set_position (query, GST_FORMAT_TIME, timeposition);
res = TRUE;
break;
case GST_FORMAT_DEFAULT:
gst_query_set_position (query, GST_FORMAT_DEFAULT,
gst_util_uint64_scale (timeposition, avstream->avg_frame_rate.num,
GST_SECOND * avstream->avg_frame_rate.den));
res = TRUE;
break;
case GST_FORMAT_BYTES:
if (demux->videopads + demux->audiopads == 1 &&
GST_PAD_PEER (demux->sinkpad) != NULL)
res = gst_pad_query_default (pad, parent, query);
break;
default:
break;
}
}
break;
case GST_QUERY_DURATION:
{
GstFormat format;
gint64 timeduration;
gst_query_parse_duration (query, &format, NULL);
timeduration =
gst_ffmpeg_time_ff_to_gst (avstream->duration, avstream->time_base);
if (!(GST_CLOCK_TIME_IS_VALID (timeduration))) {
/* use duration of complete file if the stream duration is not known */
timeduration = demux->duration;
if (!(GST_CLOCK_TIME_IS_VALID (timeduration)))
break;
}
switch (format) {
case GST_FORMAT_TIME:
gst_query_set_duration (query, GST_FORMAT_TIME, timeduration);
res = TRUE;
break;
case GST_FORMAT_DEFAULT:
gst_query_set_duration (query, GST_FORMAT_DEFAULT,
gst_util_uint64_scale (timeduration, avstream->avg_frame_rate.num,
GST_SECOND * avstream->avg_frame_rate.den));
res = TRUE;
break;
case GST_FORMAT_BYTES:
if (demux->videopads + demux->audiopads == 1 &&
GST_PAD_PEER (demux->sinkpad) != NULL)
res = gst_pad_query_default (pad, parent, query);
break;
default:
break;
}
}
break;
case GST_QUERY_SEEKING:{
GstFormat format;
gboolean seekable;
gint64 dur = -1;
gst_query_parse_seeking (query, &format, NULL, NULL, NULL);
seekable = demux->seekable;
if (!gst_pad_query_duration (pad, format, &dur)) {
/* unlikely that we don't know duration but can seek */
seekable = FALSE;
dur = -1;
}
gst_query_set_seeking (query, format, seekable, 0, dur);
res = TRUE;
break;
}
case GST_QUERY_SEGMENT:{
GstFormat format;
gint64 start, stop;
format = demux->segment.format;
start =
gst_segment_to_stream_time (&demux->segment, format,
demux->segment.start);
if ((stop = demux->segment.stop) == -1)
stop = demux->segment.duration;
else
stop = gst_segment_to_stream_time (&demux->segment, format, stop);
gst_query_set_segment (query, demux->segment.rate, format, start, stop);
res = TRUE;
break;
}
default:
/* FIXME : ADD GST_QUERY_CONVERT */
res = gst_pad_query_default (pad, parent, query);
break;
}
return res;
}
#if 0
/* FIXME, reenable me */
static gboolean
gst_ffmpegdemux_src_convert (GstPad * pad,
GstFormat src_fmt,
gint64 src_value, GstFormat * dest_fmt, gint64 * dest_value)
{
GstFFStream *stream;
gboolean res = TRUE;
AVStream *avstream;
if (!(stream = gst_pad_get_element_private (pad)))
return FALSE;
avstream = stream->avstream;
if (avstream->codec->codec_type != AVMEDIA_TYPE_VIDEO)
return FALSE;
switch (src_fmt) {
case GST_FORMAT_TIME:
switch (*dest_fmt) {
case GST_FORMAT_DEFAULT:
*dest_value = gst_util_uint64_scale (src_value,
avstream->avg_frame_rate.num,
GST_SECOND * avstream->avg_frame_rate.den);
break;
default:
res = FALSE;
break;
}
break;
case GST_FORMAT_DEFAULT:
switch (*dest_fmt) {
case GST_FORMAT_TIME:
*dest_value = gst_util_uint64_scale (src_value,
GST_SECOND * avstream->avg_frame_rate.num,
avstream->avg_frame_rate.den);
break;
default:
res = FALSE;
break;
}
break;
default:
res = FALSE;
break;
}
return res;
}
#endif
static gchar *
gst_ffmpegdemux_create_padname (const gchar * templ, gint n)
{
GString *string;
/* FIXME, we just want to printf the number according to the template but
* then the format string is not a literal and we can't check arguments and
* this generates a compiler error */
string = g_string_new (templ);
g_string_truncate (string, string->len - 2);
g_string_append_printf (string, "%u", n);
return g_string_free (string, FALSE);
}
static GstFFStream *
gst_ffmpegdemux_get_stream (GstFFMpegDemux * demux, AVStream * avstream)
{
GstFFMpegDemuxClass *oclass;
GstPadTemplate *templ = NULL;
GstPad *pad;
GstCaps *caps;
gint num;
gchar *padname;
const gchar *codec;
AVCodecContext *ctx = NULL;
GstFFStream *stream;
GstEvent *event;
gchar *stream_id;
oclass = (GstFFMpegDemuxClass *) G_OBJECT_GET_CLASS (demux);
if (demux->streams[avstream->index] != NULL)
goto exists;
ctx = avcodec_alloc_context3 (NULL);
avcodec_parameters_to_context (ctx, avstream->codecpar);
/* create new stream */
stream = g_new0 (GstFFStream, 1);
demux->streams[avstream->index] = stream;
/* mark stream as unknown */
stream->unknown = TRUE;
stream->discont = TRUE;
stream->avstream = avstream;
stream->last_ts = GST_CLOCK_TIME_NONE;
stream->tags = NULL;
switch (ctx->codec_type) {
case AVMEDIA_TYPE_VIDEO:
templ = oclass->videosrctempl;
num = demux->videopads++;
/* These are not part of the codec parameters we built the
* context from */
ctx->framerate.num = avstream->r_frame_rate.num;
ctx->framerate.den = avstream->r_frame_rate.den;
break;
case AVMEDIA_TYPE_AUDIO:
templ = oclass->audiosrctempl;
num = demux->audiopads++;
break;
default:
goto unknown_type;
}
/* get caps that belongs to this stream */
caps = gst_ffmpeg_codecid_to_caps (ctx->codec_id, ctx, TRUE);
if (caps == NULL)
goto unknown_caps;
/* stream is known now */
stream->unknown = FALSE;
/* create new pad for this stream */
padname =
gst_ffmpegdemux_create_padname (GST_PAD_TEMPLATE_NAME_TEMPLATE (templ),
num);
pad = gst_pad_new_from_template (templ, padname);
g_free (padname);
gst_pad_use_fixed_caps (pad);
gst_pad_set_active (pad, TRUE);
gst_pad_set_query_function (pad, gst_ffmpegdemux_src_query);
gst_pad_set_event_function (pad, gst_ffmpegdemux_src_event);
/* store pad internally */
stream->pad = pad;
gst_pad_set_element_private (pad, stream);
/* transform some useful info to GstClockTime and remember */
{
GstClockTime tmp;
/* FIXME, actually use the start_time in some way */
tmp = gst_ffmpeg_time_ff_to_gst (avstream->start_time, avstream->time_base);
GST_DEBUG_OBJECT (demux, "stream %d: start time: %" GST_TIME_FORMAT,
avstream->index, GST_TIME_ARGS (tmp));
tmp = gst_ffmpeg_time_ff_to_gst (avstream->duration, avstream->time_base);
GST_DEBUG_OBJECT (demux, "stream %d: duration: %" GST_TIME_FORMAT,
avstream->index, GST_TIME_ARGS (tmp));
}
demux->streams[avstream->index] = stream;
stream_id =
gst_pad_create_stream_id_printf (pad, GST_ELEMENT_CAST (demux), "%03u",
avstream->index);
event = gst_pad_get_sticky_event (demux->sinkpad, GST_EVENT_STREAM_START, 0);
if (event) {
if (gst_event_parse_group_id (event, &demux->group_id))
demux->have_group_id = TRUE;
else
demux->have_group_id = FALSE;
gst_event_unref (event);
} else if (!demux->have_group_id) {
demux->have_group_id = TRUE;
demux->group_id = gst_util_group_id_next ();
}
event = gst_event_new_stream_start (stream_id);
if (demux->have_group_id)
gst_event_set_group_id (event, demux->group_id);
gst_pad_push_event (pad, event);
g_free (stream_id);
GST_INFO_OBJECT (pad, "adding pad with caps %" GST_PTR_FORMAT, caps);
gst_pad_set_caps (pad, caps);
gst_caps_unref (caps);
/* activate and add */
gst_element_add_pad (GST_ELEMENT (demux), pad);
gst_flow_combiner_add_pad (demux->flowcombiner, pad);
/* metadata */
if ((codec = gst_ffmpeg_get_codecid_longname (ctx->codec_id))) {
stream->tags = gst_ffmpeg_metadata_to_tag_list (avstream->metadata);
if (stream->tags == NULL)
stream->tags = gst_tag_list_new_empty ();
gst_tag_list_add (stream->tags, GST_TAG_MERGE_REPLACE,
(ctx->codec_type == AVMEDIA_TYPE_VIDEO) ?
GST_TAG_VIDEO_CODEC : GST_TAG_AUDIO_CODEC, codec, NULL);
}
done:
if (ctx)
avcodec_free_context (&ctx);
return stream;
/* ERRORS */
exists:
{
GST_DEBUG_OBJECT (demux, "Pad existed (stream %d)", avstream->index);
stream = demux->streams[avstream->index];
goto done;
}
unknown_type:
{
GST_WARNING_OBJECT (demux, "Unknown pad type %d", ctx->codec_type);
goto done;
}
unknown_caps:
{
GST_WARNING_OBJECT (demux, "Unknown caps for codec %d", ctx->codec_id);
goto done;
}
}
static gchar *
safe_utf8_copy (gchar * input)
{
gchar *output;
if (!(g_utf8_validate (input, -1, NULL))) {
output = g_convert (input, strlen (input),
"UTF-8", "ISO-8859-1", NULL, NULL, NULL);
} else {
output = g_strdup (input);
}
return output;
}
/* This is a list of standard tag keys taken from the avformat.h
* header, without handling any variants. */
static const struct
{
const gchar *ffmpeg_tag_name;
const gchar *gst_tag_name;
} tagmapping[] = {
{
"album", GST_TAG_ALBUM}, {
"album_artist", GST_TAG_ALBUM_ARTIST}, {
"artist", GST_TAG_ARTIST}, {
"comment", GST_TAG_COMMENT}, {
"composer", GST_TAG_COMPOSER}, {
"copyright", GST_TAG_COPYRIGHT},
/* Need to convert ISO 8601 to GstDateTime: */
{
"creation_time", GST_TAG_DATE_TIME},
/* Need to convert ISO 8601 to GDateTime: */
{
"date", GST_TAG_DATE_TIME}, {
"disc", GST_TAG_ALBUM_VOLUME_NUMBER}, {
"encoder", GST_TAG_ENCODER}, {
"encoded_by", GST_TAG_ENCODED_BY}, {
"genre", GST_TAG_GENRE}, {
"language", GST_TAG_LANGUAGE_CODE}, {
"performer", GST_TAG_PERFORMER}, {
"publisher", GST_TAG_PUBLISHER}, {
"title", GST_TAG_TITLE}, {
"track", GST_TAG_TRACK_NUMBER}
};
static const gchar *
match_tag_name (gchar * ffmpeg_tag_name)
{
gint i;
for (i = 0; i < G_N_ELEMENTS (tagmapping); i++) {
if (!g_strcmp0 (tagmapping[i].ffmpeg_tag_name, ffmpeg_tag_name))
return tagmapping[i].gst_tag_name;
}
return NULL;
}
static GstTagList *
gst_ffmpeg_metadata_to_tag_list (AVDictionary * metadata)
{
AVDictionaryEntry *tag = NULL;
GstTagList *list;
list = gst_tag_list_new_empty ();
while ((tag = av_dict_get (metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
const gchar *gsttag = match_tag_name (tag->key);
GType t;
GST_LOG ("mapping tag %s=%s\n", tag->key, tag->value);
if (gsttag == NULL) {
GST_LOG ("Ignoring unknown metadata tag %s", tag->key);
continue;
}
/* Special case, track and disc numbers may be x/n in libav, split
* them */
if (g_str_equal (gsttag, GST_TAG_TRACK_NUMBER)) {
guint track, trackcount;
if (sscanf (tag->value, "%u/%u", &track, &trackcount) == 2) {
gst_tag_list_add (list, GST_TAG_MERGE_REPLACE,
gsttag, track, GST_TAG_TRACK_COUNT, trackcount, NULL);
continue;
}
/* Fall through and handle as a single uint below */
} else if (g_str_equal (gsttag, GST_TAG_ALBUM_VOLUME_NUMBER)) {
guint disc, disc_count;
if (sscanf (tag->value, "%u/%u", &disc, &disc_count) == 2) {
gst_tag_list_add (list, GST_TAG_MERGE_REPLACE,
gsttag, disc, GST_TAG_ALBUM_VOLUME_COUNT, disc_count, NULL);
continue;
}
/* Fall through and handle as a single uint below */
}
t = gst_tag_get_type (gsttag);
if (t == G_TYPE_STRING) {
gchar *s = safe_utf8_copy (tag->value);
gst_tag_list_add (list, GST_TAG_MERGE_REPLACE, gsttag, s, NULL);
g_free (s);
} else if (t == G_TYPE_UINT || t == G_TYPE_INT) {
gchar *end;
gint v = strtol (tag->value, &end, 10);
if (end == tag->value)
continue; /* Failed to parse */
gst_tag_list_add (list, GST_TAG_MERGE_REPLACE, gsttag, v, NULL);
} else if (t == G_TYPE_DATE) {
guint year, month, day;
GDate *date = NULL;
if (sscanf (tag->value, "%04u-%02u-%02u", &year, &month, &day) == 3) {
date = g_date_new_dmy (day, month, year);
} else {
/* Try interpreting just as a year */
gchar *end;
year = strtol (tag->value, &end, 10);
if (end != tag->value)
date = g_date_new_dmy (1, 1, year);
}
if (date) {
gst_tag_list_add (list, GST_TAG_MERGE_REPLACE, gsttag, date, NULL);
g_date_free (date);
}
} else if (t == GST_TYPE_DATE_TIME) {
gchar *s = safe_utf8_copy (tag->value);
GstDateTime *d = gst_date_time_new_from_iso8601_string (s);
g_free (s);
if (d) {
gst_tag_list_add (list, GST_TAG_MERGE_REPLACE, gsttag, d, NULL);
gst_date_time_unref (d);
}
} else {
GST_FIXME ("Unhandled tag %s", gsttag);
}
}
if (gst_tag_list_is_empty (list)) {
gst_tag_list_unref (list);
return NULL;
}
return list;
}
static gboolean
gst_ffmpegdemux_open (GstFFMpegDemux * demux)
{
AVIOContext *iocontext = NULL;
GstFFMpegDemuxClass *oclass =
(GstFFMpegDemuxClass *) G_OBJECT_GET_CLASS (demux);
gint res, n_streams, i;
GstTagList *tags;
GstEvent *event;
GList *cached_events;
GstQuery *query;
gchar *uri = NULL;
/* to be sure... */
gst_ffmpegdemux_close (demux);
/* open via our input protocol hack */
if (demux->seekable)
res = gst_ffmpegdata_open (demux->sinkpad, AVIO_FLAG_READ, &iocontext);
else
res = gst_ffmpeg_pipe_open (&demux->ffpipe, AVIO_FLAG_READ, &iocontext);
if (res < 0)
goto beach;
query = gst_query_new_uri ();
if (gst_pad_peer_query (demux->sinkpad, query)) {
gchar *query_uri, *redirect_uri;
gboolean permanent;
gst_query_parse_uri (query, &query_uri);
gst_query_parse_uri_redirection (query, &redirect_uri);
gst_query_parse_uri_redirection_permanent (query, &permanent);
if (permanent && redirect_uri) {
uri = redirect_uri;
g_free (query_uri);
} else {
uri = query_uri;
g_free (redirect_uri);
}
}
gst_query_unref (query);
GST_DEBUG_OBJECT (demux, "Opening context with URI %s", GST_STR_NULL (uri));
demux->context = avformat_alloc_context ();
demux->context->pb = iocontext;
res = avformat_open_input (&demux->context, uri, oclass->in_plugin, NULL);
g_free (uri);
GST_DEBUG_OBJECT (demux, "av_open_input returned %d", res);
if (res < 0)
goto beach;
res = gst_ffmpeg_av_find_stream_info (demux->context);
GST_DEBUG_OBJECT (demux, "av_find_stream_info returned %d", res);
if (res < 0)
goto beach;
n_streams = demux->context->nb_streams;
GST_DEBUG_OBJECT (demux, "we have %d streams", n_streams);
/* open_input_file() automatically reads the header. We can now map each
* created AVStream to a GstPad to make GStreamer handle it. */
for (i = 0; i < n_streams; i++) {
gst_ffmpegdemux_get_stream (demux, demux->context->streams[i]);
}
gst_element_no_more_pads (GST_ELEMENT (demux));
/* transform some useful info to GstClockTime and remember */
demux->start_time = gst_util_uint64_scale_int (demux->context->start_time,
GST_SECOND, AV_TIME_BASE);
GST_DEBUG_OBJECT (demux, "start time: %" GST_TIME_FORMAT,
GST_TIME_ARGS (demux->start_time));
if (demux->context->duration > 0)
demux->duration = gst_util_uint64_scale_int (demux->context->duration,
GST_SECOND, AV_TIME_BASE);
else
demux->duration = GST_CLOCK_TIME_NONE;
GST_DEBUG_OBJECT (demux, "duration: %" GST_TIME_FORMAT,
GST_TIME_ARGS (demux->duration));
/* store duration in the segment as well */
demux->segment.duration = demux->duration;
GST_OBJECT_LOCK (demux);
demux->opened = TRUE;
event = demux->seek_event;
demux->seek_event = NULL;
cached_events = demux->cached_events;
demux->cached_events = NULL;
GST_OBJECT_UNLOCK (demux);
if (event) {
gst_ffmpegdemux_perform_seek (demux, event);
gst_event_unref (event);
} else {
GST_DEBUG_OBJECT (demux, "Sending segment %" GST_SEGMENT_FORMAT,
&demux->segment);
gst_ffmpegdemux_push_event (demux, gst_event_new_segment (&demux->segment));
}
while (cached_events) {
event = cached_events->data;
GST_INFO_OBJECT (demux, "pushing cached event: %" GST_PTR_FORMAT, event);
gst_ffmpegdemux_push_event (demux, event);
cached_events = g_list_delete_link (cached_events, cached_events);
}
/* grab the global tags */
tags = gst_ffmpeg_metadata_to_tag_list (demux->context->metadata);
if (tags) {
GST_INFO_OBJECT (demux, "global tags: %" GST_PTR_FORMAT, tags);
}
/* now handle the stream tags */
for (i = 0; i < n_streams; i++) {
GstFFStream *stream;
stream = gst_ffmpegdemux_get_stream (demux, demux->context->streams[i]);
if (stream->pad != NULL) {
/* Global tags */
if (tags)
gst_pad_push_event (stream->pad,
gst_event_new_tag (gst_tag_list_ref (tags)));
/* Per-stream tags */
if (stream->tags != NULL) {
GST_INFO_OBJECT (stream->pad, "stream tags: %" GST_PTR_FORMAT,
stream->tags);
gst_pad_push_event (stream->pad,
gst_event_new_tag (gst_tag_list_ref (stream->tags)));
}
}
}
if (tags)
gst_tag_list_unref (tags);
return TRUE;
/* ERRORS */
beach:
{
GST_ELEMENT_ERROR (demux, LIBRARY, FAILED, (NULL),
("%s", gst_ffmpegdemux_averror (res)));
return FALSE;
}
}
#define GST_FFMPEG_TYPE_FIND_SIZE 4096
#define GST_FFMPEG_TYPE_FIND_MIN_SIZE 256
static void
gst_ffmpegdemux_type_find (GstTypeFind * tf, gpointer priv)
{
const guint8 *data;
AVInputFormat *in_plugin = (AVInputFormat *) priv;
gint res = 0;
guint64 length;
GstCaps *sinkcaps;
/* We want GST_FFMPEG_TYPE_FIND_SIZE bytes, but if the file is shorter than
* that we'll give it a try... */
length = gst_type_find_get_length (tf);
if (length == 0 || length > GST_FFMPEG_TYPE_FIND_SIZE)
length = GST_FFMPEG_TYPE_FIND_SIZE;
/* The ffmpeg typefinders assume there's a certain minimum amount of data
* and will happily do invalid memory access if there isn't, so let's just
* skip the ffmpeg typefinders if the data available is too short
* (in which case it's unlikely to be a media file anyway) */
if (length < GST_FFMPEG_TYPE_FIND_MIN_SIZE) {
GST_LOG ("not typefinding %" G_GUINT64_FORMAT " bytes, too short", length);
return;
}
GST_LOG ("typefinding %" G_GUINT64_FORMAT " bytes", length);
if (in_plugin->read_probe &&
(data = gst_type_find_peek (tf, 0, length)) != NULL) {
AVProbeData probe_data;
probe_data.filename = "";
probe_data.buf = (guint8 *) data;
probe_data.buf_size = length;
res = in_plugin->read_probe (&probe_data);
if (res > 0) {
res = MAX (1, res * GST_TYPE_FIND_MAXIMUM / AVPROBE_SCORE_MAX);
/* Restrict the probability for MPEG-TS streams, because there is
* probably a better version in plugins-base, if the user has a recent
* plugins-base (in fact we shouldn't even get here for ffmpeg mpegts or
* mpegtsraw typefinders, since we blacklist them) */
if (g_str_has_prefix (in_plugin->name, "mpegts"))
res = MIN (res, GST_TYPE_FIND_POSSIBLE);
sinkcaps = gst_ffmpeg_formatid_to_caps (in_plugin->name);
GST_LOG ("libav typefinder '%s' suggests %" GST_PTR_FORMAT ", p=%u%%",
in_plugin->name, sinkcaps, res);
gst_type_find_suggest (tf, res, sinkcaps);
gst_caps_unref (sinkcaps);
}
}
}
/* Task */
static void
gst_ffmpegdemux_loop (GstFFMpegDemux * demux)
{
GstFlowReturn ret;
gint res = -1;
AVPacket pkt;
GstPad *srcpad;
GstFFStream *stream;
AVStream *avstream;
GstBuffer *outbuf = NULL;
GstClockTime timestamp, duration;
gint outsize;
gboolean rawvideo;
GstFlowReturn stream_last_flow;
gint64 pts;
/* open file if we didn't so already */
if (!demux->opened)
if (!gst_ffmpegdemux_open (demux))
goto open_failed;
GST_DEBUG_OBJECT (demux, "about to read a frame");
/* read a frame */
res = av_read_frame (demux->context, &pkt);
if (res < 0)
goto read_failed;
/* get the stream */
stream =
gst_ffmpegdemux_get_stream (demux,
demux->context->streams[pkt.stream_index]);
/* check if we know the stream */
if (stream->unknown)
goto done;
/* get more stuff belonging to this stream */
avstream = stream->avstream;
/* do timestamps, we do this first so that we can know when we
* stepped over the segment stop position. */
pts = pkt.pts;
if (G_UNLIKELY (pts < 0)) {
/* some streams have pts such this:
* 0
* -2
* -1
* 1
*
* we reset pts to 0 since for us timestamp are unsigned
*/
GST_WARNING_OBJECT (demux,
"negative pts detected: %" G_GINT64_FORMAT " resetting to 0", pts);
pts = 0;
}
timestamp = gst_ffmpeg_time_ff_to_gst (pts, avstream->time_base);
if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
stream->last_ts = timestamp;
}
duration = gst_ffmpeg_time_ff_to_gst (pkt.duration, avstream->time_base);
if (G_UNLIKELY (!duration)) {
GST_WARNING_OBJECT (demux, "invalid buffer duration, setting to NONE");
duration = GST_CLOCK_TIME_NONE;
}
GST_DEBUG_OBJECT (demux,
"pkt pts:%" GST_TIME_FORMAT
" / size:%d / stream_index:%d / flags:%d / duration:%" GST_TIME_FORMAT
" / pos:%" G_GINT64_FORMAT, GST_TIME_ARGS (timestamp), pkt.size,
pkt.stream_index, pkt.flags, GST_TIME_ARGS (duration), (gint64) pkt.pos);
/* check start_time */
#if 0
if (demux->start_time != -1 && demux->start_time > timestamp)
goto drop;
#endif
if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
/* start_time should be the ts of the first frame but it may actually be
* higher because of rounding when converting to gst ts. */
if (demux->start_time >= timestamp)
timestamp = 0;
else
timestamp -= demux->start_time;
}
/* check if we ran outside of the segment */
if (demux->segment.stop != -1 && timestamp > demux->segment.stop)
goto drop;
/* prepare to push packet to peer */
srcpad = stream->pad;
rawvideo = (avstream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
avstream->codecpar->codec_id == AV_CODEC_ID_RAWVIDEO);
if (rawvideo)
outsize = gst_ffmpeg_avpicture_get_size (avstream->codecpar->format,
avstream->codecpar->width, avstream->codecpar->height);
else
outsize = pkt.size;
outbuf = gst_buffer_new_and_alloc (outsize);
/* copy the data from packet into the target buffer
* and do conversions for raw video packets */
if (rawvideo) {
AVFrame src, dst;
const gchar *plugin_name =
((GstFFMpegDemuxClass *) (G_OBJECT_GET_CLASS (demux)))->in_plugin->name;
GstMapInfo map;
GST_WARNING ("Unknown demuxer %s, no idea what to do", plugin_name);
gst_ffmpeg_avpicture_fill (&src, pkt.data,
avstream->codecpar->format, avstream->codecpar->width,
avstream->codecpar->height);
gst_buffer_map (outbuf, &map, GST_MAP_WRITE);
gst_ffmpeg_avpicture_fill (&dst, map.data,
avstream->codecpar->format, avstream->codecpar->width,
avstream->codecpar->height);
av_image_copy (dst.data, dst.linesize, (const uint8_t **) src.data,
src.linesize, avstream->codecpar->format, avstream->codecpar->width,
avstream->codecpar->height);
gst_buffer_unmap (outbuf, &map);
} else {
gst_buffer_fill (outbuf, 0, pkt.data, outsize);
}
GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
GST_BUFFER_DURATION (outbuf) = duration;
/* mark keyframes */
if (!(pkt.flags & AV_PKT_FLAG_KEY)) {
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
}
/* Mark discont */
if (stream->discont) {
GST_DEBUG_OBJECT (demux, "marking DISCONT");
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
stream->discont = FALSE;
}
GST_DEBUG_OBJECT (demux,
"Sending out buffer time:%" GST_TIME_FORMAT " size:%" G_GSIZE_FORMAT,
GST_TIME_ARGS (timestamp), gst_buffer_get_size (outbuf));
ret = stream_last_flow = gst_pad_push (srcpad, outbuf);
/* if a pad is in e.g. WRONG_STATE, we want to pause to unlock the STREAM_LOCK */
if (((ret = gst_flow_combiner_update_flow (demux->flowcombiner,
ret)) != GST_FLOW_OK)) {
GST_WARNING_OBJECT (demux, "stream_movi flow: %s / %s",
gst_flow_get_name (stream_last_flow), gst_flow_get_name (ret));
goto pause;
}
done:
/* can destroy the packet now */
if (res == 0) {
av_packet_unref (&pkt);
}
return;
/* ERRORS */
pause:
{
GST_LOG_OBJECT (demux, "pausing task, reason %d (%s)", ret,
gst_flow_get_name (ret));
if (demux->seekable)
gst_pad_pause_task (demux->sinkpad);
else {
GstFFMpegPipe *ffpipe = &demux->ffpipe;
GST_FFMPEG_PIPE_MUTEX_LOCK (ffpipe);
/* pause task and make sure loop stops */
gst_task_pause (demux->task);
g_rec_mutex_lock (&demux->task_lock);
g_rec_mutex_unlock (&demux->task_lock);
demux->ffpipe.srcresult = ret;
GST_FFMPEG_PIPE_MUTEX_UNLOCK (ffpipe);
}
if (ret == GST_FLOW_EOS) {
if (demux->segment.flags & GST_SEEK_FLAG_SEGMENT) {
gint64 stop;
if ((stop = demux->segment.stop) == -1)
stop = demux->segment.duration;
GST_LOG_OBJECT (demux, "posting segment done");
gst_element_post_message (GST_ELEMENT (demux),
gst_message_new_segment_done (GST_OBJECT (demux),
demux->segment.format, stop));
gst_ffmpegdemux_push_event (demux,
gst_event_new_segment_done (demux->segment.format, stop));
} else {
GST_LOG_OBJECT (demux, "pushing eos");
gst_ffmpegdemux_push_event (demux, gst_event_new_eos ());
}
} else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
GST_ELEMENT_FLOW_ERROR (demux, ret);
gst_ffmpegdemux_push_event (demux, gst_event_new_eos ());
}
goto done;
}
open_failed:
{
ret = GST_FLOW_ERROR;
goto pause;
}
read_failed:
{
/* something went wrong... */
GST_WARNING_OBJECT (demux, "av_read_frame returned %d", res);
GST_OBJECT_LOCK (demux);
/* pause appropriatly based on if we are flushing or not */
if (demux->flushing)
ret = GST_FLOW_FLUSHING;
else if (gst_ffmpegdemux_has_outputted (demux)
|| gst_ffmpegdemux_is_eos (demux)) {
GST_DEBUG_OBJECT (demux, "We are EOS");
ret = GST_FLOW_EOS;
} else
ret = GST_FLOW_ERROR;
GST_OBJECT_UNLOCK (demux);
goto pause;
}
drop:
{
GST_DEBUG_OBJECT (demux, "dropping buffer out of segment, stream eos");
stream->eos = TRUE;
if (gst_ffmpegdemux_is_eos (demux)) {
av_packet_unref (&pkt);
GST_DEBUG_OBJECT (demux, "we are eos");
ret = GST_FLOW_EOS;
goto pause;
} else {
GST_DEBUG_OBJECT (demux, "some streams are not yet eos");
goto done;
}
}
}
static gboolean
gst_ffmpegdemux_sink_event (GstPad * sinkpad, GstObject * parent,
GstEvent * event)
{
GstFFMpegDemux *demux;
GstFFMpegPipe *ffpipe;
gboolean result = TRUE;
demux = (GstFFMpegDemux *) parent;
ffpipe = &(demux->ffpipe);
GST_LOG_OBJECT (demux, "event: %" GST_PTR_FORMAT, event);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
/* forward event */
gst_pad_event_default (sinkpad, parent, event);
/* now unblock the chain function */
GST_FFMPEG_PIPE_MUTEX_LOCK (ffpipe);
ffpipe->srcresult = GST_FLOW_FLUSHING;
GST_FFMPEG_PIPE_SIGNAL (ffpipe);
GST_FFMPEG_PIPE_MUTEX_UNLOCK (ffpipe);
/* loop might run into WRONG_STATE and end itself,
* but may also be waiting in a ffmpeg read
* trying to break that would make ffmpeg believe eos,
* so no harm to have the loop 'pausing' there ... */
goto done;
case GST_EVENT_FLUSH_STOP:
/* forward event */
gst_pad_event_default (sinkpad, parent, event);
GST_OBJECT_LOCK (demux);
g_list_foreach (demux->cached_events, (GFunc) gst_mini_object_unref,
NULL);
g_list_free (demux->cached_events);
GST_OBJECT_UNLOCK (demux);
GST_FFMPEG_PIPE_MUTEX_LOCK (ffpipe);
gst_adapter_clear (ffpipe->adapter);
ffpipe->srcresult = GST_FLOW_OK;
/* loop may have decided to end itself as a result of flush WRONG_STATE */
gst_task_start (demux->task);
demux->flushing = FALSE;
GST_LOG_OBJECT (demux, "loop started");
GST_FFMPEG_PIPE_MUTEX_UNLOCK (ffpipe);
goto done;
case GST_EVENT_EOS:
/* inform the src task that it can stop now */
GST_FFMPEG_PIPE_MUTEX_LOCK (ffpipe);
ffpipe->eos = TRUE;
GST_FFMPEG_PIPE_SIGNAL (ffpipe);
GST_FFMPEG_PIPE_MUTEX_UNLOCK (ffpipe);
/* eat this event for now, task will send eos when finished */
gst_event_unref (event);
goto done;
case GST_EVENT_STREAM_START:
case GST_EVENT_CAPS:
case GST_EVENT_SEGMENT:
GST_LOG_OBJECT (demux, "dropping %s event", GST_EVENT_TYPE_NAME (event));
gst_event_unref (event);
goto done;
default:
/* for a serialized event, wait until an earlier data is gone,
* though this is no guarantee as to when task is done with it.
*
* If the demuxer isn't opened, push straight away, since we'll
* be waiting against a cond that will never be signalled. */
if (GST_EVENT_IS_SERIALIZED (event)) {
if (demux->opened) {
GST_FFMPEG_PIPE_MUTEX_LOCK (ffpipe);
while (!ffpipe->needed)
GST_FFMPEG_PIPE_WAIT (ffpipe);
GST_FFMPEG_PIPE_MUTEX_UNLOCK (ffpipe);
} else {
/* queue events and send them later (esp. tag events) */
GST_OBJECT_LOCK (demux);
demux->cached_events = g_list_append (demux->cached_events, event);
GST_OBJECT_UNLOCK (demux);
goto done;
}
}
break;
}
result = gst_pad_event_default (sinkpad, parent, event);
done:
return result;
}
static GstFlowReturn
gst_ffmpegdemux_chain (GstPad * sinkpad, GstObject * parent, GstBuffer * buffer)
{
GstFFMpegDemux *demux;
GstFFMpegPipe *ffpipe;
demux = (GstFFMpegDemux *) parent;
ffpipe = &demux->ffpipe;
GST_FFMPEG_PIPE_MUTEX_LOCK (ffpipe);
if (G_UNLIKELY (ffpipe->eos))
goto eos;
if (G_UNLIKELY (ffpipe->srcresult != GST_FLOW_OK))
goto ignore;
GST_DEBUG ("Giving a buffer of %" G_GSIZE_FORMAT " bytes",
gst_buffer_get_size (buffer));
gst_adapter_push (ffpipe->adapter, buffer);
buffer = NULL;
while (gst_adapter_available (ffpipe->adapter) >= ffpipe->needed) {
GST_DEBUG ("Adapter has more that requested (ffpipe->needed:%d)",
ffpipe->needed);
GST_FFMPEG_PIPE_SIGNAL (ffpipe);
GST_FFMPEG_PIPE_WAIT (ffpipe);
/* may have become flushing */
if (G_UNLIKELY (ffpipe->srcresult != GST_FLOW_OK))
goto ignore;
}
GST_FFMPEG_PIPE_MUTEX_UNLOCK (ffpipe);
return GST_FLOW_OK;
/* special cases */
eos:
{
GST_DEBUG_OBJECT (demux, "ignoring buffer at end-of-stream");
GST_FFMPEG_PIPE_MUTEX_UNLOCK (ffpipe);
gst_buffer_unref (buffer);
return GST_FLOW_EOS;
}
ignore:
{
GST_DEBUG_OBJECT (demux, "ignoring buffer because src task encountered %s",
gst_flow_get_name (ffpipe->srcresult));
GST_FFMPEG_PIPE_MUTEX_UNLOCK (ffpipe);
if (buffer)
gst_buffer_unref (buffer);
return GST_FLOW_FLUSHING;
}
}
static gboolean
gst_ffmpegdemux_sink_activate (GstPad * sinkpad, GstObject * parent)
{
GstQuery *query;
gboolean pull_mode;
GstSchedulingFlags flags;
query = gst_query_new_scheduling ();
if (!gst_pad_peer_query (sinkpad, query)) {
gst_query_unref (query);
goto activate_push;
}
pull_mode = gst_query_has_scheduling_mode_with_flags (query,
GST_PAD_MODE_PULL, GST_SCHEDULING_FLAG_SEEKABLE);
gst_query_parse_scheduling (query, &flags, NULL, NULL, NULL);
if (flags & GST_SCHEDULING_FLAG_SEQUENTIAL)
pull_mode = FALSE;
gst_query_unref (query);
if (!pull_mode)
goto activate_push;
GST_DEBUG_OBJECT (sinkpad, "activating pull");
return gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PULL, TRUE);
activate_push:
{
GST_DEBUG_OBJECT (sinkpad, "activating push");
return gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PUSH, TRUE);
}
}
/* push mode:
* - not seekable
* - use gstpipe protocol, like ffmpeg's pipe protocol
* - (independently managed) task driving ffmpeg
*/
static gboolean
gst_ffmpegdemux_sink_activate_push (GstPad * sinkpad, GstObject * parent,
gboolean active)
{
GstFFMpegDemux *demux;
gboolean res = FALSE;
demux = (GstFFMpegDemux *) (parent);
if (active) {
if (demux->can_push == FALSE) {
GST_WARNING_OBJECT (demux, "Demuxer can't reliably operate in push-mode");
goto beach;
}
demux->ffpipe.eos = FALSE;
demux->ffpipe.srcresult = GST_FLOW_OK;
demux->ffpipe.needed = 0;
demux->seekable = FALSE;
res = gst_task_start (demux->task);
} else {
GstFFMpegPipe *ffpipe = &demux->ffpipe;
/* release chain and loop */
GST_FFMPEG_PIPE_MUTEX_LOCK (ffpipe);
demux->ffpipe.srcresult = GST_FLOW_FLUSHING;
/* end streaming by making ffmpeg believe eos */
demux->ffpipe.eos = TRUE;
GST_FFMPEG_PIPE_SIGNAL (ffpipe);
GST_FFMPEG_PIPE_MUTEX_UNLOCK (ffpipe);
/* make sure streaming ends */
gst_task_stop (demux->task);
g_rec_mutex_lock (&demux->task_lock);
g_rec_mutex_unlock (&demux->task_lock);
res = gst_task_join (demux->task);
demux->seekable = FALSE;
}
beach:
return res;
}
/* pull mode:
* - seekable
* - use gstreamer protocol, like ffmpeg's file protocol
* - task driving ffmpeg based on sink pad
*/
static gboolean
gst_ffmpegdemux_sink_activate_pull (GstPad * sinkpad, GstObject * parent,
gboolean active)
{
GstFFMpegDemux *demux;
gboolean res;
demux = (GstFFMpegDemux *) parent;
if (active) {
demux->seekable = TRUE;
res = gst_pad_start_task (sinkpad, (GstTaskFunction) gst_ffmpegdemux_loop,
demux, NULL);
} else {
res = gst_pad_stop_task (sinkpad);
demux->seekable = FALSE;
}
return res;
}
static gboolean
gst_ffmpegdemux_sink_activate_mode (GstPad * sinkpad, GstObject * parent,
GstPadMode mode, gboolean active)
{
gboolean res;
switch (mode) {
case GST_PAD_MODE_PUSH:
res = gst_ffmpegdemux_sink_activate_push (sinkpad, parent, active);
break;
case GST_PAD_MODE_PULL:
res = gst_ffmpegdemux_sink_activate_pull (sinkpad, parent, active);
break;
default:
res = FALSE;
break;
}
return res;
}
static GstStateChangeReturn
gst_ffmpegdemux_change_state (GstElement * element, GstStateChange transition)
{
GstFFMpegDemux *demux = (GstFFMpegDemux *) (element);
GstStateChangeReturn ret;
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
#if 0
/* test seek in READY here */
gst_element_send_event (element, gst_event_new_seek (1.0,
GST_FORMAT_TIME, GST_SEEK_FLAG_NONE,
GST_SEEK_TYPE_SET, 10 * GST_SECOND,
GST_SEEK_TYPE_SET, 13 * GST_SECOND));
#endif
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_ffmpegdemux_close (demux);
gst_adapter_clear (demux->ffpipe.adapter);
g_list_foreach (demux->cached_events, (GFunc) gst_mini_object_unref,
NULL);
g_list_free (demux->cached_events);
demux->cached_events = NULL;
demux->have_group_id = FALSE;
demux->group_id = G_MAXUINT;
break;
default:
break;
}
return ret;
}
gboolean
gst_ffmpegdemux_register (GstPlugin * plugin)
{
GType type;
const AVInputFormat *in_plugin;
gchar *extensions;
GTypeInfo typeinfo = {
sizeof (GstFFMpegDemuxClass),
(GBaseInitFunc) gst_ffmpegdemux_base_init,
NULL,
(GClassInitFunc) gst_ffmpegdemux_class_init,
NULL,
NULL,
sizeof (GstFFMpegDemux),
0,
(GInstanceInitFunc) gst_ffmpegdemux_init,
};
void *i = 0;
GST_LOG ("Registering demuxers");
while ((in_plugin = av_demuxer_iterate (&i))) {
gchar *type_name, *typefind_name;
gint rank;
gboolean register_typefind_func = TRUE;
GST_LOG ("Attempting to handle libav demuxer plugin %s [%s]",
in_plugin->name, in_plugin->long_name);
/* no emulators */
if (in_plugin->long_name != NULL) {
if (!strncmp (in_plugin->long_name, "raw ", 4) ||
!strncmp (in_plugin->long_name, "pcm ", 4)
)
continue;
}
if (!strcmp (in_plugin->name, "audio_device") ||
!strncmp (in_plugin->name, "image", 5) ||
!strcmp (in_plugin->name, "mpegvideo") ||
!strcmp (in_plugin->name, "mjpeg") ||
!strcmp (in_plugin->name, "redir") ||
!strncmp (in_plugin->name, "u8", 2) ||
!strncmp (in_plugin->name, "u16", 3) ||
!strncmp (in_plugin->name, "u24", 3) ||
!strncmp (in_plugin->name, "u32", 3) ||
!strncmp (in_plugin->name, "s8", 2) ||
!strncmp (in_plugin->name, "s16", 3) ||
!strncmp (in_plugin->name, "s24", 3) ||
!strncmp (in_plugin->name, "s32", 3) ||
!strncmp (in_plugin->name, "f32", 3) ||
!strncmp (in_plugin->name, "f64", 3) ||
!strcmp (in_plugin->name, "mulaw") || !strcmp (in_plugin->name, "alaw")
)
continue;
/* no network demuxers */
if (!strcmp (in_plugin->name, "sdp") ||
!strcmp (in_plugin->name, "rtsp") ||
!strcmp (in_plugin->name, "applehttp")
)
continue;
/* these don't do what one would expect or
* are only partially functional/useful */
if (!strcmp (in_plugin->name, "aac") ||
!strcmp (in_plugin->name, "wv") ||
!strcmp (in_plugin->name, "ass") ||
!strcmp (in_plugin->name, "ffmetadata"))
continue;
/* Don't use the typefind functions of formats for which we already have
* better typefind functions */
if (!strcmp (in_plugin->name, "mov,mp4,m4a,3gp,3g2,mj2") ||
!strcmp (in_plugin->name, "ass") ||
!strcmp (in_plugin->name, "avi") ||
!strcmp (in_plugin->name, "asf") ||
!strcmp (in_plugin->name, "mpegvideo") ||
!strcmp (in_plugin->name, "mp3") ||
!strcmp (in_plugin->name, "matroska") ||
!strcmp (in_plugin->name, "matroska_webm") ||
!strcmp (in_plugin->name, "matroska,webm") ||
!strcmp (in_plugin->name, "mpeg") ||
!strcmp (in_plugin->name, "wav") ||
!strcmp (in_plugin->name, "au") ||
!strcmp (in_plugin->name, "tta") ||
!strcmp (in_plugin->name, "rm") ||
!strcmp (in_plugin->name, "amr") ||
!strcmp (in_plugin->name, "ogg") ||
!strcmp (in_plugin->name, "aiff") ||
!strcmp (in_plugin->name, "ape") ||
!strcmp (in_plugin->name, "dv") ||
!strcmp (in_plugin->name, "flv") ||
!strcmp (in_plugin->name, "mpc") ||
!strcmp (in_plugin->name, "mpc8") ||
!strcmp (in_plugin->name, "mpegts") ||
!strcmp (in_plugin->name, "mpegtsraw") ||
!strcmp (in_plugin->name, "mxf") ||
!strcmp (in_plugin->name, "nuv") ||
!strcmp (in_plugin->name, "swf") ||
!strcmp (in_plugin->name, "voc") ||
!strcmp (in_plugin->name, "pva") ||
!strcmp (in_plugin->name, "gif") ||
!strcmp (in_plugin->name, "vc1test") ||
!strcmp (in_plugin->name, "ivf"))
register_typefind_func = FALSE;
/* Set the rank of demuxers known to work to MARGINAL.
* Set demuxers for which we already have another implementation to NONE
* Set All others to NONE*/
/**
* element-avdemux_xwma
*
* Since: 1.20
*/
if (!strcmp (in_plugin->name, "wsvqa") ||
!strcmp (in_plugin->name, "wsaud") ||
!strcmp (in_plugin->name, "wc3movie") ||
!strcmp (in_plugin->name, "voc") ||
!strcmp (in_plugin->name, "tta") ||
!strcmp (in_plugin->name, "sol") ||
!strcmp (in_plugin->name, "smk") ||
!strcmp (in_plugin->name, "vmd") ||
!strcmp (in_plugin->name, "film_cpk") ||
!strcmp (in_plugin->name, "ingenient") ||
!strcmp (in_plugin->name, "psxstr") ||
!strcmp (in_plugin->name, "nuv") ||
!strcmp (in_plugin->name, "nut") ||
!strcmp (in_plugin->name, "nsv") ||
!strcmp (in_plugin->name, "mxf") ||
!strcmp (in_plugin->name, "mmf") ||
!strcmp (in_plugin->name, "mm") ||
!strcmp (in_plugin->name, "ipmovie") ||
!strcmp (in_plugin->name, "ape") ||
!strcmp (in_plugin->name, "RoQ") ||
!strcmp (in_plugin->name, "idcin") ||
!strcmp (in_plugin->name, "gxf") ||
!strcmp (in_plugin->name, "ffm") ||
!strcmp (in_plugin->name, "ea") ||
!strcmp (in_plugin->name, "daud") ||
!strcmp (in_plugin->name, "avs") ||
!strcmp (in_plugin->name, "aiff") ||
!strcmp (in_plugin->name, "xwma") ||
!strcmp (in_plugin->name, "4xm") ||
!strcmp (in_plugin->name, "yuv4mpegpipe") ||
!strcmp (in_plugin->name, "pva") ||
!strcmp (in_plugin->name, "mpc") ||
!strcmp (in_plugin->name, "mpc8") ||
!strcmp (in_plugin->name, "ivf") ||
!strcmp (in_plugin->name, "brstm") ||
!strcmp (in_plugin->name, "bfstm") ||
!strcmp (in_plugin->name, "gif") ||
!strcmp (in_plugin->name, "dsf") || !strcmp (in_plugin->name, "iff"))
rank = GST_RANK_MARGINAL;
else {
GST_DEBUG ("ignoring %s", in_plugin->name);
rank = GST_RANK_NONE;
continue;
}
/* construct the type */
type_name = g_strdup_printf ("avdemux_%s", in_plugin->name);
g_strdelimit (type_name, ".,|-<> ", '_');
/* if it's already registered, drop it */
if (g_type_from_name (type_name)) {
g_free (type_name);
continue;
}
typefind_name = g_strdup_printf ("avtype_%s", in_plugin->name);
g_strdelimit (typefind_name, ".,|-<> ", '_');
/* create the type now */
type = g_type_register_static (GST_TYPE_ELEMENT, type_name, &typeinfo, 0);
g_type_set_qdata (type, GST_FFDEMUX_PARAMS_QDATA, (gpointer) in_plugin);
if (in_plugin->extensions)
extensions = g_strdelimit (g_strdup (in_plugin->extensions), " ", ',');
else
extensions = NULL;
if (!gst_element_register (plugin, type_name, rank, type) ||
(register_typefind_func == TRUE &&
!gst_type_find_register (plugin, typefind_name, rank,
gst_ffmpegdemux_type_find, extensions, NULL,
(gpointer) in_plugin, NULL))) {
g_warning ("Registration of type %s failed", type_name);
g_free (type_name);
g_free (typefind_name);
g_free (extensions);
return FALSE;
}
g_free (type_name);
g_free (typefind_name);
g_free (extensions);
}
GST_LOG ("Finished registering demuxers");
return TRUE;
}
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