Preroll decoders when video starts playing

media/base/android/media_decoder_job.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/base/android/media_decoder_job.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/debug/trace_event.h"
 #include "base/message_loop/message_loop_proxy.h"
@@ skipping 98 matching lines @@
   RequestData(prefetch_cb);
 }
 
 bool MediaDecoderJob::Decode(
     base::TimeTicks start_time_ticks,
     base::TimeDelta start_presentation_timestamp,
     const DecoderCallback& callback) {
   DCHECK(decode_cb_.is_null());
   DCHECK(data_received_cb_.is_null());
   DCHECK(ui_task_runner_->BelongsToCurrentThread());
-
   if (!media_codec_bridge_ || need_to_reconfig_decoder_job_) {
     need_to_reconfig_decoder_job_ = !CreateMediaCodecBridge();
     if (drain_decoder_) {
       // Decoder has been recreated, stop draining.
       drain_decoder_ = false;
       input_eos_encountered_ = false;
       output_eos_encountered_ = false;
       access_unit_index_[current_demuxer_data_index_]++;
     }
     skip_eos_enqueue_ = true;
@@ skipping 374 matching lines @@
     delete this;
     return;
   }
 
   if (status == MEDIA_CODEC_OUTPUT_END_OF_STREAM)
     output_eos_encountered_ = true;
 
   DCHECK(!decode_cb_.is_null());
 
   // If output was queued for rendering, then we have completed prerolling.
-  if (current_presentation_timestamp != kNoTimestamp())
+  if (current_presentation_timestamp != kNoTimestamp() ||
+      status == MEDIA_CODEC_OUTPUT_END_OF_STREAM) {
     prerolling_ = false;
+  }
 
   switch (status) {
     case MEDIA_CODEC_OK:
     case MEDIA_CODEC_DEQUEUE_OUTPUT_AGAIN_LATER:
     case MEDIA_CODEC_OUTPUT_BUFFERS_CHANGED:
     case MEDIA_CODEC_OUTPUT_FORMAT_CHANGED:
     case MEDIA_CODEC_OUTPUT_END_OF_STREAM:
       if (!input_eos_encountered_) {
         CurrentDataConsumed(
             CurrentAccessUnit().status == DemuxerStream::kConfigChanged);
@@ skipping 118 matching lines @@
 
 void MediaDecoderJob::ReleaseMediaCodecBridge() {
   if (!media_codec_bridge_)
     return;
 
   media_codec_bridge_.reset();
   input_buf_index_ = -1;
 }
 
 }  // namespace media