Reorganize bitstream converter classes.

media/filters/bitstream_converter.cc

 // Copyright (c) 2011 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/bitstream_converter.h"
 
 #include "base/logging.h"
 #include "media/ffmpeg/ffmpeg_common.h"
 
 namespace media {
 
-bool IdentityBitstreamConverter::Initialize() {
-  return true;
-}
-
-bool IdentityBitstreamConverter::ConvertPacket(AVPacket* packet) {
-  return true;
-}
-
 FFmpegBitstreamConverter::FFmpegBitstreamConverter(
     const std::string& filter_name,
     AVCodecContext* stream_context)
     : filter_name_(filter_name),
       stream_filter_(NULL),
       stream_context_(stream_context) {
   CHECK(stream_context_);
 }
 
 FFmpegBitstreamConverter::~FFmpegBitstreamConverter() {
@@ skipping 38 matching lines @@
     av_free_packet(packet);
     packet->data = converted_data;
     packet->size = converted_size;
     packet->destruct = av_destruct_packet;
   }
 
   return true;
 }
 
 }  // namespace media