bool
MP3TrackDemuxer::Init() {
Reset();
FastSeek(TimeUnit());
// Read the first frame to fetch sample rate and other meta data.
nsRefPtr<MediaRawData> frame(GetNextFrame(FindNextFrame()));
MP3DEMUXER_LOG("Init StreamLength()=%" PRId64 " first-frame-found=%d",
StreamLength(), !!frame);
if (!frame) {
return false;
}
// Rewind back to the stream begin to avoid dropping the first frame.
FastSeek(TimeUnit());
if (!mInfo) {
mInfo = MakeUnique<AudioInfo>();
}
mInfo->mRate = mSamplesPerSecond;
mInfo->mChannels = mChannels;
mInfo->mBitDepth = 16;
mInfo->mMimeType = "audio/mpeg";
mInfo->mDuration = Duration().ToMicroseconds();
MP3DEMUXER_LOG("Init mInfo={mRate=%d mChannels=%d mBitDepth=%d mDuration=%" PRId64 "}",
mInfo->mRate, mInfo->mChannels, mInfo->mBitDepth,
mInfo->mDuration);
return mSamplesPerSecond && mChannels;
}
TimeUnit
MP3TrackDemuxer::FastSeek(TimeUnit aTime) {
MP3DEMUXER_LOG("FastSeek(%" PRId64 ") avgFrameLen=%f mNumParsedFrames=%" PRIu64
" mFrameIndex=%" PRId64 " mOffset=%" PRIu64,
aTime, AverageFrameLength(), mNumParsedFrames, mFrameIndex,
mOffset);
if (!aTime.ToMicroseconds()) {
// Quick seek to the beginning of the stream.
mOffset = mFirstFrameOffset;
mFrameIndex = 0;
mParser.EndFrameSession();
return TimeUnit();
}
if (!mSamplesPerFrame || !mNumParsedFrames) {
return TimeUnit::FromMicroseconds(-1);
}
const int64_t numFrames = aTime.ToSeconds() *
mSamplesPerSecond / mSamplesPerFrame;
mOffset = mFirstFrameOffset + numFrames * AverageFrameLength();
mFrameIndex = numFrames;
MP3DEMUXER_LOG("FastSeek mSamplesPerSecond=%d mSamplesPerFrame=%d "
"numFrames=%" PRId64,
mSamplesPerSecond, mSamplesPerFrame, numFrames);
mParser.EndFrameSession();
return Duration(mFrameIndex);
}
void
MediaSourceTrackDemuxer::Reset()
{
MOZ_ASSERT(mParent, "Called after BreackCycle()");
RefPtr<MediaSourceTrackDemuxer> self = this;
nsCOMPtr<nsIRunnable> task =
NS_NewRunnableFunction([self] () {
self->mManager->Seek(self->mType, TimeUnit(), TimeUnit());
{
MonitorAutoLock mon(self->mMonitor);
self->mNextRandomAccessPoint =
self->mManager->GetNextRandomAccessPoint(self->mType);
}
});
mParent->GetTaskQueue()->Dispatch(task.forget());
}
TimeUnit
MP3TrackDemuxer::FastSeek(TimeUnit aTime) {
if (!aTime.ToMicroseconds()) {
// Quick seek to the beginning of the stream.
mOffset = mFirstFrameOffset;
mFrameIndex = 0;
mParser.EndFrameSession();
return TimeUnit();
}
if (!mSamplesPerFrame || !mNumParsedFrames) {
return TimeUnit::FromMicroseconds(-1);
}
const int64_t numFrames = aTime.ToSeconds() *
mSamplesPerSecond / mSamplesPerFrame;
mOffset = mFirstFrameOffset + numFrames * AverageFrameLength();
mFrameIndex = numFrames;
mParser.EndFrameSession();
return Duration(mFrameIndex);
}