Motown: Ffmpeg video decoder

services/media/framework_ffmpeg/ffmpeg_decoder.cc

 // Copyright 2016 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 "services/media/framework_ffmpeg/av_codec_context.h"
 #include "services/media/framework_ffmpeg/ffmpeg_audio_decoder.h"
 #include "services/media/framework_ffmpeg/ffmpeg_decoder.h"
 #include "services/media/framework_ffmpeg/ffmpeg_video_decoder.h"
 
 namespace mojo {
 namespace media {
 
 Result FfmpegDecoder::Create(const StreamType& stream_type,
                              std::shared_ptr<Decoder>* decoder_out) {
   DCHECK(decoder_out);
 
   AvCodecContextPtr av_codec_context(AvCodecContext::Create(stream_type));
   if (!av_codec_context) {
+    LOG(ERROR) << "couldn't create codec context";
     return Result::kUnsupportedOperation;
   }
 
   AVCodec* ffmpeg_decoder = avcodec_find_decoder(av_codec_context->codec_id);
   if (ffmpeg_decoder == nullptr) {
+    LOG(ERROR) << "couldn't find decoder context";
     return Result::kUnsupportedOperation;
   }
 
   int r = avcodec_open2(av_codec_context.get(), ffmpeg_decoder, nullptr);
   if (r < 0) {
+    LOG(ERROR) << "couldn't open the decoder " << r;
     return Result::kUnknownError;
   }
 
   switch (av_codec_context->codec_type) {
     case AVMEDIA_TYPE_AUDIO:
       *decoder_out = std::shared_ptr<Decoder>(
           new FfmpegAudioDecoder(std::move(av_codec_context)));
       break;
     case AVMEDIA_TYPE_VIDEO:
       *decoder_out = std::shared_ptr<Decoder>(
           new FfmpegVideoDecoder(std::move(av_codec_context)));
       break;
     default:
+      LOG(ERROR) << "unsupported codec type " << av_codec_context->codec_type;
       return Result::kUnsupportedOperation;
   }
 
   return Result::kOk;
 }
 
 }  // namespace media
 }  // namespace mojo