HLS: faster switching and pause/resume on low buffer

- when upswitching, discard excessive buffering on low
  bandwidth variant, switch to new variant earlier

- when downswitching, report newly found IDR positions
  continuously, and switch as soon as new fetcher passes
  playback position. This allows us to skip time-consuming
  resumeUntil() of old fetcher most of the time

- implement pause/resume on low buffering, and notify
  buffering percentage

- buffering parameter tuning, separate pause/resume/ready
  buffer level and up/down switch buffer level, boost up
  fetcher buffering significantly

bug: 19567254

Change-Id: I750dfcc6f861d78d16a71f501beb86d8129cb048

1 files changed, 7 insertions, 0 deletions

diff --git a/media/libstagefright/mpeg2ts/AnotherPacketSource.h b/media/libstagefright/mpeg2ts/AnotherPacketSource.h
index d4fde7c..e126006 100644
--- a/media/libstagefright/mpeg2ts/AnotherPacketSource.h
+++ b/media/libstagefright/mpeg2ts/AnotherPacketSource.h
@@ -70,8 +70,14 @@ struct AnotherPacketSource : public MediaSource {
 
     bool isFinished(int64_t duration) const;
 
+    void enable(bool enable);
+
     sp<AMessage> getLatestEnqueuedMeta();
     sp<AMessage> getLatestDequeuedMeta();
+    sp<AMessage> getMetaAfterLastDequeued(int64_t delayUs);
+
+    void trimBuffersAfterTimeUs(size_t discontinuitySeq, int64_t timeUs);
+    sp<AMessage> trimBuffersBeforeTimeUs(size_t discontinuitySeq, int64_t timeUs);
 
 protected:
     virtual ~AnotherPacketSource();
@@ -82,6 +88,7 @@ private:
 
     bool mIsAudio;
     bool mIsVideo;
+    bool mEnabled;
     sp<MetaData> mFormat;
     int64_t mLastQueuedTimeUs;
     List<sp<ABuffer> > mBuffers;