Allow ffmpeg to process individual NALU rather than require frames.

media/filters/ffmpeg_video_decoder.cc

 // Copyright (c) 2012 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/filters/ffmpeg_video_decoder.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 50 matching lines @@
   return decoder->GetVideoBuffer(s, frame, flags);
 }
 
 static void ReleaseVideoBufferImpl(void* opaque, uint8* data) {
   scoped_refptr<VideoFrame> video_frame;
   video_frame.swap(reinterpret_cast<VideoFrame**>(&opaque));
 }
 
 FFmpegVideoDecoder::FFmpegVideoDecoder(
     const scoped_refptr<base::SingleThreadTaskRunner>& task_runner)
-    : task_runner_(task_runner), state_(kUninitialized) {}
+    : task_runner_(task_runner), state_(kUninitialized),
+      decode_nalus_(false) {}
 
 int FFmpegVideoDecoder::GetVideoBuffer(struct AVCodecContext* codec_context,
                                        AVFrame* frame,
                                        int flags) {
   // Don't use |codec_context_| here! With threaded decoding,
   // it will contain unsynchronized width/height/pix_fmt values,
   // whereas |codec_context| contains the current threads's
   // updated width/height/pix_fmt, which can change for adaptive
   // content.
   VideoFrame::Format format = PixelFormatToVideoFormat(codec_context->pix_fmt);
@@ skipping 271 matching lines @@
   codec_context_.reset(avcodec_alloc_context3(NULL));
   VideoDecoderConfigToAVCodecContext(config_, codec_context_.get());
 
   codec_context_->thread_count = GetThreadCount(codec_context_->codec_id);
   codec_context_->thread_type = low_delay ? FF_THREAD_SLICE : FF_THREAD_FRAME;
   codec_context_->opaque = this;
   codec_context_->flags |= CODEC_FLAG_EMU_EDGE;
   codec_context_->get_buffer2 = GetVideoBufferImpl;
   codec_context_->refcounted_frames = 1;
 
+  if (decode_nalus_)
+    codec_context_->flags2 |= CODEC_FLAG2_CHUNKS;
+
   AVCodec* codec = avcodec_find_decoder(codec_context_->codec_id);
   if (!codec || avcodec_open2(codec_context_.get(), codec, NULL) < 0) {
     ReleaseFFmpegResources();
     return false;
   }
 
   av_frame_.reset(av_frame_alloc());
   return true;
 }
 
 }  // namespace media