Transcoder: Improve AV transcoding speed by enforcing sequential sample access.
MediaSampleReader was bottlenecking the transcoding pipeline due to
non-sequential sample access. This commit adds an option to the sample
reader to enforce sequential sample access by blocking reads until
the underlying extractor advances to that specific track.
Follow-up: b/165374867 Make MediaSampleWriter robust against buffering track transcoders
Fixes: 160268606
Test: Transcoder unit tests, and benchmark tests.
Change-Id: Id2a363d06df927ea3e547462c52803594e0511e1
diff --git a/media/libmediatranscoding/transcoder/MediaTrackTranscoder.cpp b/media/libmediatranscoding/transcoder/MediaTrackTranscoder.cpp
index 58e2066..92ce60a 100644
--- a/media/libmediatranscoding/transcoder/MediaTrackTranscoder.cpp
+++ b/media/libmediatranscoding/transcoder/MediaTrackTranscoder.cpp
@@ -92,6 +92,7 @@
if (mState == STARTED) {
abortTranscodeLoop();
+ mMediaSampleReader->setEnforceSequentialAccess(false);
mTranscodingThread.join();
mOutputQueue->abort(); // Wake up any threads waiting for samples.
mState = STOPPED;