avcodec/mediacodecdec: add delay_flush option

The default behavior of the mediacodec decoder before this commit
was to delay flushes until all pending hardware frames were
returned to the decoder. This was useful for certain types of
applications, but was unexpected behavior for others.

The new default behavior with this commit is now to execute
flushes immediately to invalidate all pending frames. The old
behavior can be enabled by setting delay_flush=1.

With the new behavior, video players implementing seek can simply
call flush on the decoder without having to worry about whether
they have one or more mediacodec frames still buffered in their
rendering pipeline. Previously, all these frames had to be
explictly freed (or rendered) before the seek/flush would execute.

The new behavior matches the behavior of all other lavc decoders,
reducing the amount of special casing required when using the
mediacodec decoder.

Signed-off-by: Aman Gupta <aman@tmm1.net>
Signed-off-by: Matthieu Bouron <matthieu.bouron@gmail.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/libavcodec/mediacodecdec_common.h b/libavcodec/mediacodecdec_common.h
index 85df507ffb..afb98ffed9 100644
--- a/libavcodec/mediacodecdec_common.h
+++ b/libavcodec/mediacodecdec_common.h
@@ -62,6 +62,9 @@ typedef struct MediaCodecDecContext {
 
     uint64_t output_buffer_count;
 
+    bool delay_flush;
+    atomic_int serial;
+
 } MediaCodecDecContext;
 
 int ff_mediacodec_dec_init(AVCodecContext *avctx,
@@ -93,6 +96,7 @@ typedef struct MediaCodecBuffer {
     ssize_t index;
     int64_t pts;
     atomic_int released;
+    int serial;
 
 } MediaCodecBuffer;