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);
}
already_AddRefed<MediaByteBuffer>
SourceBuffer::PrepareAppend(const uint8_t* aData, uint32_t aLength, ErrorResult& aRv)
{
typedef SourceBufferContentManager::EvictDataResult Result;
if (!IsAttached() || mUpdating) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return nullptr;
}
if (mMediaSource->ReadyState() == MediaSourceReadyState::Ended) {
mMediaSource->SetReadyState(MediaSourceReadyState::Open);
}
// Eviction uses a byte threshold. If the buffer is greater than the
// number of bytes then data is evicted. The time range for this
// eviction is reported back to the media source. It will then
// evict data before that range across all SourceBuffers it knows
// about.
// TODO: Make the eviction threshold smaller for audio-only streams.
// TODO: Drive evictions off memory pressure notifications.
// TODO: Consider a global eviction threshold rather than per TrackBuffer.
TimeUnit newBufferStartTime;
// Attempt to evict the amount of data we are about to add by lowering the
// threshold.
uint32_t toEvict =
(mEvictionThreshold > aLength) ? mEvictionThreshold - aLength : aLength;
Result evicted =
mContentManager->EvictData(TimeUnit::FromSeconds(mMediaSource->GetDecoder()->GetCurrentTime()),
toEvict, &newBufferStartTime);
if (evicted == Result::DATA_EVICTED) {
MSE_DEBUG("AppendData Evict; current buffered start=%f",
GetBufferedStart());
// We notify that we've evicted from the time range 0 through to
// the current start point.
mMediaSource->NotifyEvicted(0.0, newBufferStartTime.ToSeconds());
}
// See if we have enough free space to append our new data.
// As we can only evict once we have playable data, we must give a chance
// to the DASH player to provide a complete media segment.
if (aLength > mEvictionThreshold || evicted == Result::BUFFER_FULL ||
((!mIsUsingFormatReader &&
mContentManager->GetSize() > mEvictionThreshold - aLength) &&
evicted != Result::CANT_EVICT)) {
aRv.Throw(NS_ERROR_DOM_QUOTA_EXCEEDED_ERR);
return nullptr;
}
nsRefPtr<MediaByteBuffer> data = new MediaByteBuffer();
if (!data->AppendElements(aData, aLength, fallible)) {
aRv.Throw(NS_ERROR_DOM_QUOTA_EXCEEDED_ERR);
return nullptr;
}
return data.forget();
}
void MediaDecoder::DurationChanged(TimeUnit aNewDuration)
{
MOZ_ASSERT(NS_IsMainThread());
ReentrantMonitorAutoEnter mon(GetReentrantMonitor());
int64_t oldDuration = mDuration;
mDuration = aNewDuration.ToMicroseconds();
// Duration has changed so we should recompute playback rate
UpdatePlaybackRate();
SetInfinite(mDuration == -1);
if (mOwner && oldDuration != mDuration && !IsInfinite()) {
DECODER_LOG("Duration changed to %lld", mDuration);
mOwner->DispatchAsyncEvent(NS_LITERAL_STRING("durationchange"));
}
if (CurrentPosition() > aNewDuration.ToMicroseconds()) {
Seek(aNewDuration.ToSeconds(), SeekTarget::Accurate);
}
}
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);
}
