nsresult GStreamerReader::ReadMetadata(MediaInfo* aInfo,
MetadataTags** aTags)
{
NS_ASSERTION(mDecoder->OnDecodeThread(), "Should be on decode thread.");
nsresult ret = NS_OK;
/*
* Parse MP3 headers before we kick off the GStreamer pipeline otherwise there
* might be concurrent stream operations happening on both decoding and gstreamer
* threads which will screw the GStreamer state machine.
*/
bool isMP3 = mDecoder->GetResource()->GetContentType().EqualsASCII(AUDIO_MP3);
if (isMP3) {
ParseMP3Headers();
}
/* We do 3 attempts here: decoding audio and video, decoding video only,
* decoding audio only. This allows us to play streams that have one broken
* stream but that are otherwise decodeable.
*/
guint flags[3] = {GST_PLAY_FLAG_VIDEO|GST_PLAY_FLAG_AUDIO,
static_cast<guint>(~GST_PLAY_FLAG_AUDIO), static_cast<guint>(~GST_PLAY_FLAG_VIDEO)};
guint default_flags, current_flags;
g_object_get(mPlayBin, "flags", &default_flags, nullptr);
GstMessage* message = nullptr;
for (unsigned int i = 0; i < G_N_ELEMENTS(flags); i++) {
current_flags = default_flags & flags[i];
g_object_set(G_OBJECT(mPlayBin), "flags", current_flags, nullptr);
/* reset filter caps to ANY */
GstCaps* caps = gst_caps_new_any();
GstElement* filter = gst_bin_get_by_name(GST_BIN(mAudioSink), "filter");
g_object_set(filter, "caps", caps, nullptr);
gst_object_unref(filter);
filter = gst_bin_get_by_name(GST_BIN(mVideoSink), "filter");
g_object_set(filter, "caps", caps, nullptr);
gst_object_unref(filter);
gst_caps_unref(caps);
filter = nullptr;
if (!(current_flags & GST_PLAY_FLAG_AUDIO))
filter = gst_bin_get_by_name(GST_BIN(mAudioSink), "filter");
else if (!(current_flags & GST_PLAY_FLAG_VIDEO))
filter = gst_bin_get_by_name(GST_BIN(mVideoSink), "filter");
if (filter) {
/* Little trick: set the target caps to "skip" so that playbin2 fails to
* find a decoder for the stream we want to skip.
*/
GstCaps* filterCaps = gst_caps_new_simple ("skip", nullptr, nullptr);
g_object_set(filter, "caps", filterCaps, nullptr);
gst_caps_unref(filterCaps);
gst_object_unref(filter);
}
LOG(PR_LOG_DEBUG, "starting metadata pipeline");
if (gst_element_set_state(mPlayBin, GST_STATE_PAUSED) == GST_STATE_CHANGE_FAILURE) {
LOG(PR_LOG_DEBUG, "metadata pipeline state change failed");
ret = NS_ERROR_FAILURE;
continue;
}
/* Wait for ASYNC_DONE, which is emitted when the pipeline is built,
* prerolled and ready to play. Also watch for errors.
*/
message = gst_bus_timed_pop_filtered(mBus, GST_CLOCK_TIME_NONE,
(GstMessageType)(GST_MESSAGE_ASYNC_DONE | GST_MESSAGE_ERROR | GST_MESSAGE_EOS));
if (GST_MESSAGE_TYPE(message) == GST_MESSAGE_ASYNC_DONE) {
LOG(PR_LOG_DEBUG, "read metadata pipeline prerolled");
gst_message_unref(message);
ret = NS_OK;
break;
} else {
LOG(PR_LOG_DEBUG, "read metadata pipeline failed to preroll: %s",
gst_message_type_get_name (GST_MESSAGE_TYPE (message)));
if (GST_MESSAGE_TYPE(message) == GST_MESSAGE_ERROR) {
GError* error;
gchar* debug;
gst_message_parse_error(message, &error, &debug);
LOG(PR_LOG_ERROR, "read metadata error: %s: %s", error->message, debug);
g_error_free(error);
g_free(debug);
}
/* Unexpected stream close/EOS or other error. We'll give up if all
* streams are in error/eos. */
gst_element_set_state(mPlayBin, GST_STATE_NULL);
gst_message_unref(message);
ret = NS_ERROR_FAILURE;
}
}
if (NS_SUCCEEDED(ret))
ret = CheckSupportedFormats();
if (NS_FAILED(ret))
/* we couldn't get this to play */
return ret;
/* report the duration */
gint64 duration;
if (isMP3 && mMP3FrameParser.IsMP3()) {
// The MP3FrameParser has reported a duration; use that over the gstreamer
// reported duration for inter-platform consistency.
ReentrantMonitorAutoEnter mon(mDecoder->GetReentrantMonitor());
mUseParserDuration = true;
mLastParserDuration = mMP3FrameParser.GetDuration();
mDecoder->SetMediaDuration(mLastParserDuration);
} else {
LOG(PR_LOG_DEBUG, "querying duration");
// Otherwise use the gstreamer duration.
#if GST_VERSION_MAJOR >= 1
if (gst_element_query_duration(GST_ELEMENT(mPlayBin),
GST_FORMAT_TIME, &duration)) {
#else
GstFormat format = GST_FORMAT_TIME;
if (gst_element_query_duration(GST_ELEMENT(mPlayBin),
&format, &duration) && format == GST_FORMAT_TIME) {
#endif
ReentrantMonitorAutoEnter mon(mDecoder->GetReentrantMonitor());
LOG(PR_LOG_DEBUG, "have duration %" GST_TIME_FORMAT, GST_TIME_ARGS(duration));
duration = GST_TIME_AS_USECONDS (duration);
mDecoder->SetMediaDuration(duration);
}
}
int n_video = 0, n_audio = 0;
g_object_get(mPlayBin, "n-video", &n_video, "n-audio", &n_audio, nullptr);
mInfo.mVideo.mHasVideo = n_video != 0;
mInfo.mAudio.mHasAudio = n_audio != 0;
*aInfo = mInfo;
*aTags = nullptr;
// Watch the pipeline for fatal errors
#if GST_VERSION_MAJOR >= 1
gst_bus_set_sync_handler(mBus, GStreamerReader::ErrorCb, this, nullptr);
#else
gst_bus_set_sync_handler(mBus, GStreamerReader::ErrorCb, this);
#endif
/* set the pipeline to PLAYING so that it starts decoding and queueing data in
* the appsinks */
gst_element_set_state(mPlayBin, GST_STATE_PLAYING);
return NS_OK;
}
bool
GStreamerReader::IsMediaSeekable()
{
if (mUseParserDuration) {
return true;
}
gint64 duration;
#if GST_VERSION_MAJOR >= 1
if (gst_element_query_duration(GST_ELEMENT(mPlayBin), GST_FORMAT_TIME,
&duration)) {
#else
GstFormat format = GST_FORMAT_TIME;
if (gst_element_query_duration(GST_ELEMENT(mPlayBin), &format, &duration) &&
format == GST_FORMAT_TIME) {
#endif
return true;
}
return false;
}
nsresult GStreamerReader::CheckSupportedFormats()
{
bool done = false;
bool unsupported = false;
GstIterator* it = gst_bin_iterate_recurse(GST_BIN(mPlayBin));
while (!done) {
GstIteratorResult res;
GstElement* element;
#if GST_VERSION_MAJOR >= 1
GValue value = {0,};
res = gst_iterator_next(it, &value);
#else
res = gst_iterator_next(it, (void **) &element);
#endif
switch(res) {
case GST_ITERATOR_OK:
{
#if GST_VERSION_MAJOR >= 1
element = GST_ELEMENT (g_value_get_object (&value));
#endif
GstElementFactory* factory = gst_element_get_factory(element);
if (factory) {
const char* klass = gst_element_factory_get_klass(factory);
GstPad* pad = gst_element_get_static_pad(element, "sink");
if (pad) {
GstCaps* caps;
#if GST_VERSION_MAJOR >= 1
caps = gst_pad_get_current_caps(pad);
#else
caps = gst_pad_get_negotiated_caps(pad);
#endif
if (caps) {
/* check for demuxers but ignore elements like id3demux */
if (strstr (klass, "Demuxer") && !strstr(klass, "Metadata"))
unsupported = !GStreamerFormatHelper::Instance()->CanHandleContainerCaps(caps);
else if (strstr (klass, "Decoder") && !strstr(klass, "Generic"))
unsupported = !GStreamerFormatHelper::Instance()->CanHandleCodecCaps(caps);
gst_caps_unref(caps);
}
gst_object_unref(pad);
}
}
#if GST_VERSION_MAJOR >= 1
g_value_unset (&value);
#else
gst_object_unref(element);
#endif
done = unsupported;
break;
}
case GST_ITERATOR_RESYNC:
unsupported = false;
done = false;
break;
case GST_ITERATOR_ERROR:
done = true;
break;
case GST_ITERATOR_DONE:
done = true;
break;
}
}
return unsupported ? NS_ERROR_FAILURE : NS_OK;
}
nsresult GStreamerReader::ResetDecode()
{
nsresult res = NS_OK;
LOG(PR_LOG_DEBUG, "reset decode");
if (NS_FAILED(MediaDecoderReader::ResetDecode())) {
res = NS_ERROR_FAILURE;
}
mVideoQueue.Reset();
mAudioQueue.Reset();
mVideoSinkBufferCount = 0;
mAudioSinkBufferCount = 0;
mReachedAudioEos = false;
mReachedVideoEos = false;
#if GST_VERSION_MAJOR >= 1
mConfigureAlignment = true;
#endif
LOG(PR_LOG_DEBUG, "reset decode done");
return res;
}
bool GStreamerReader::DecodeAudioData()
{
NS_ASSERTION(mDecoder->OnDecodeThread(), "Should be on decode thread.");
GstBuffer *buffer = nullptr;
{
ReentrantMonitorAutoEnter mon(mGstThreadsMonitor);
if (mReachedAudioEos && !mAudioSinkBufferCount) {
return false;
}
/* Wait something to be decoded before return or continue */
if (!mAudioSinkBufferCount) {
if(!mVideoSinkBufferCount) {
/* We have nothing decoded so it makes no sense to return to the state machine
* as it will call us back immediately, we'll return again and so on, wasting
* CPU cycles for no job done. So, block here until there is either video or
* audio data available
*/
mon.Wait();
if (!mAudioSinkBufferCount) {
/* There is still no audio data available, so either there is video data or
* something else has happened (Eos, etc...). Return to the state machine
* to process it.
*/
return true;
}
}
else {
return true;
}
}
#if GST_VERSION_MAJOR >= 1
GstSample *sample = gst_app_sink_pull_sample(mAudioAppSink);
buffer = gst_buffer_ref(gst_sample_get_buffer(sample));
gst_sample_unref(sample);
#else
buffer = gst_app_sink_pull_buffer(mAudioAppSink);
#endif
mAudioSinkBufferCount--;
}
int64_t timestamp = GST_BUFFER_TIMESTAMP(buffer);
{
ReentrantMonitorAutoEnter mon(mGstThreadsMonitor);
timestamp = gst_segment_to_stream_time(&mAudioSegment,
GST_FORMAT_TIME, timestamp);
}
timestamp = GST_TIME_AS_USECONDS(timestamp);
int64_t offset = GST_BUFFER_OFFSET(buffer);
guint8* data;
#if GST_VERSION_MAJOR >= 1
GstMapInfo info;
gst_buffer_map(buffer, &info, GST_MAP_READ);
unsigned int size = info.size;
data = info.data;
#else
unsigned int size = GST_BUFFER_SIZE(buffer);
data = GST_BUFFER_DATA(buffer);
#endif
int32_t frames = (size / sizeof(AudioDataValue)) / mInfo.mAudio.mChannels;
typedef AudioCompactor::NativeCopy GstCopy;
mAudioCompactor.Push(offset,
timestamp,
mInfo.mAudio.mRate,
frames,
mInfo.mAudio.mChannels,
GstCopy(data,
size,
mInfo.mAudio.mChannels));
#if GST_VERSION_MAJOR >= 1
gst_buffer_unmap(buffer, &info);
#endif
gst_buffer_unref(buffer);
return true;
}
bool GStreamerReader::DecodeVideoFrame(bool &aKeyFrameSkip,
int64_t aTimeThreshold)
{
NS_ASSERTION(mDecoder->OnDecodeThread(), "Should be on decode thread.");
GstBuffer *buffer = nullptr;
{
ReentrantMonitorAutoEnter mon(mGstThreadsMonitor);
if (mReachedVideoEos && !mVideoSinkBufferCount) {
return false;
}
/* Wait something to be decoded before return or continue */
if (!mVideoSinkBufferCount) {
if (!mAudioSinkBufferCount) {
/* We have nothing decoded so it makes no sense to return to the state machine
* as it will call us back immediately, we'll return again and so on, wasting
* CPU cycles for no job done. So, block here until there is either video or
* audio data available
*/
mon.Wait();
if (!mVideoSinkBufferCount) {
/* There is still no video data available, so either there is audio data or
* something else has happened (Eos, etc...). Return to the state machine
* to process it
*/
return true;
}
}
else {
return true;
}
}
mDecoder->NotifyDecodedFrames(0, 1);
#if GST_VERSION_MAJOR >= 1
GstSample *sample = gst_app_sink_pull_sample(mVideoAppSink);
buffer = gst_buffer_ref(gst_sample_get_buffer(sample));
gst_sample_unref(sample);
#else
buffer = gst_app_sink_pull_buffer(mVideoAppSink);
#endif
mVideoSinkBufferCount--;
}
bool isKeyframe = !GST_BUFFER_FLAG_IS_SET(buffer, GST_BUFFER_FLAG_DELTA_UNIT);
if ((aKeyFrameSkip && !isKeyframe)) {
gst_buffer_unref(buffer);
return true;
}
int64_t timestamp = GST_BUFFER_TIMESTAMP(buffer);
{
ReentrantMonitorAutoEnter mon(mGstThreadsMonitor);
timestamp = gst_segment_to_stream_time(&mVideoSegment,
GST_FORMAT_TIME, timestamp);
}
NS_ASSERTION(GST_CLOCK_TIME_IS_VALID(timestamp),
"frame has invalid timestamp");
timestamp = GST_TIME_AS_USECONDS(timestamp);
int64_t duration = 0;
if (GST_CLOCK_TIME_IS_VALID(GST_BUFFER_DURATION(buffer)))
duration = GST_TIME_AS_USECONDS(GST_BUFFER_DURATION(buffer));
else if (fpsNum && fpsDen)
/* add 1-frame duration */
duration = gst_util_uint64_scale(GST_USECOND, fpsDen, fpsNum);
if (timestamp < aTimeThreshold) {
LOG(PR_LOG_DEBUG, "skipping frame %" GST_TIME_FORMAT
" threshold %" GST_TIME_FORMAT,
GST_TIME_ARGS(timestamp * 1000),
GST_TIME_ARGS(aTimeThreshold * 1000));
gst_buffer_unref(buffer);
return true;
}
if (!buffer)
/* no more frames */
return true;
#if GST_VERSION_MAJOR >= 1
if (mConfigureAlignment && buffer->pool) {
GstStructure *config = gst_buffer_pool_get_config(buffer->pool);
GstVideoAlignment align;
if (gst_buffer_pool_config_get_video_alignment(config, &align))
gst_video_info_align(&mVideoInfo, &align);
gst_structure_free(config);
mConfigureAlignment = false;
}
#endif
nsRefPtr<PlanarYCbCrImage> image = GetImageFromBuffer(buffer);
if (!image) {
/* Ugh, upstream is not calling gst_pad_alloc_buffer(). Fallback to
* allocating a PlanarYCbCrImage backed GstBuffer here and memcpy.
*/
GstBuffer* tmp = nullptr;
CopyIntoImageBuffer(buffer, &tmp, image);
gst_buffer_unref(buffer);
buffer = tmp;
}
int64_t offset = mDecoder->GetResource()->Tell(); // Estimate location in media.
VideoData* video = VideoData::CreateFromImage(mInfo.mVideo,
mDecoder->GetImageContainer(),
offset, timestamp, duration,
static_cast<Image*>(image.get()),
isKeyframe, -1, mPicture);
mVideoQueue.Push(video);
gst_buffer_unref(buffer);
return true;
}
bool GStreamerReader::DecodeVideoFrame(bool &aKeyFrameSkip,
int64_t aTimeThreshold)
{
NS_ASSERTION(mDecoder->OnDecodeThread(), "Should be on decode thread.");
GstBuffer *buffer = nullptr;
{
ReentrantMonitorAutoEnter mon(mGstThreadsMonitor);
if (mReachedVideoEos && !mVideoSinkBufferCount) {
return false;
}
/* Wait something to be decoded before return or continue */
if (!mVideoSinkBufferCount) {
if (!mAudioSinkBufferCount) {
/* We have nothing decoded so it makes no sense to return to the state machine
* as it will call us back immediately, we'll return again and so on, wasting
* CPU cycles for no job done. So, block here until there is either video or
* audio data available
*/
mon.Wait();
if (!mVideoSinkBufferCount) {
/* There is still no video data available, so either there is audio data or
* something else has happened (Eos, etc...). Return to the state machine
* to process it
*/
return true;
}
}
else {
return true;
}
}
mDecoder->NotifyDecodedFrames(0, 1);
#if GST_VERSION_MAJOR >= 1
GstSample *sample = gst_app_sink_pull_sample(mVideoAppSink);
buffer = gst_buffer_ref(gst_sample_get_buffer(sample));
gst_sample_unref(sample);
#else
buffer = gst_app_sink_pull_buffer(mVideoAppSink);
#endif
mVideoSinkBufferCount--;
}
bool isKeyframe = !GST_BUFFER_FLAG_IS_SET(buffer, GST_BUFFER_FLAG_DELTA_UNIT);
if ((aKeyFrameSkip && !isKeyframe)) {
gst_buffer_unref(buffer);
return true;
}
int64_t timestamp = GST_BUFFER_TIMESTAMP(buffer);
{
ReentrantMonitorAutoEnter mon(mGstThreadsMonitor);
timestamp = gst_segment_to_stream_time(&mVideoSegment,
GST_FORMAT_TIME, timestamp);
}
NS_ASSERTION(GST_CLOCK_TIME_IS_VALID(timestamp),
"frame has invalid timestamp");
timestamp = GST_TIME_AS_USECONDS(timestamp);
int64_t duration = 0;
if (GST_CLOCK_TIME_IS_VALID(GST_BUFFER_DURATION(buffer)))
duration = GST_TIME_AS_USECONDS(GST_BUFFER_DURATION(buffer));
else if (fpsNum && fpsDen)
/* add 1-frame duration */
duration = gst_util_uint64_scale(GST_USECOND, fpsDen, fpsNum);
if (timestamp < aTimeThreshold) {
LOG(PR_LOG_DEBUG, "skipping frame %" GST_TIME_FORMAT
" threshold %" GST_TIME_FORMAT,
GST_TIME_ARGS(timestamp * 1000),
GST_TIME_ARGS(aTimeThreshold * 1000));
gst_buffer_unref(buffer);
return true;
}
if (!buffer)
/* no more frames */
return true;
#if GST_VERSION_MAJOR >= 1
if (mConfigureAlignment && buffer->pool) {
GstStructure *config = gst_buffer_pool_get_config(buffer->pool);
GstVideoAlignment align;
if (gst_buffer_pool_config_get_video_alignment(config, &align))
gst_video_info_align(&mVideoInfo, &align);
gst_structure_free(config);
mConfigureAlignment = false;
}
#endif
nsRefPtr<PlanarYCbCrImage> image = GetImageFromBuffer(buffer);
if (!image) {
/* Ugh, upstream is not calling gst_pad_alloc_buffer(). Fallback to
* allocating a PlanarYCbCrImage backed GstBuffer here and memcpy.
*/
GstBuffer* tmp = nullptr;
CopyIntoImageBuffer(buffer, &tmp, image);
gst_buffer_unref(buffer);
buffer = tmp;
}
int64_t offset = mDecoder->GetResource()->Tell(); // Estimate location in media.
VideoData* video = VideoData::CreateFromImage(mInfo.mVideo,
mDecoder->GetImageContainer(),
offset, timestamp, duration,
static_cast<Image*>(image.get()),
isKeyframe, -1, mPicture);
mVideoQueue.Push(video);
gst_buffer_unref(buffer);
return true;
}