media: Reland "Simplify {Audio|Video}Decoder initialization callback."

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 144 matching lines @@
                        0);
   return 0;
 }
 
 std::string FFmpegVideoDecoder::GetDisplayName() const {
   return "FFmpegVideoDecoder";
 }
 
 void FFmpegVideoDecoder::Initialize(const VideoDecoderConfig& config,
                                     bool low_delay,
-                                    const PipelineStatusCB& status_cb,
+                                    const InitCB& init_cb,
                                     const OutputCB& output_cb) {
   DCHECK(task_runner_->BelongsToCurrentThread());
   DCHECK(!config.is_encrypted());
   DCHECK(!output_cb.is_null());
 
   FFmpegGlue::InitializeFFmpeg();
 
   config_ = config;
-  PipelineStatusCB initialize_cb = BindToCurrentLoop(status_cb);
+  InitCB bound_init_cb = BindToCurrentLoop(init_cb);
 
   if (!config.IsValidConfig() || !ConfigureDecoder(low_delay)) {
-    initialize_cb.Run(DECODER_ERROR_NOT_SUPPORTED);
+    bound_init_cb.Run(false);
     return;
   }
 
   output_cb_ = BindToCurrentLoop(output_cb);
 
   // Success!
   state_ = kNormal;
-  initialize_cb.Run(PIPELINE_OK);
+  bound_init_cb.Run(true);
 }
 
 void FFmpegVideoDecoder::Decode(const scoped_refptr<DecoderBuffer>& buffer,
                                 const DecodeCB& decode_cb) {
   DCHECK(task_runner_->BelongsToCurrentThread());
   DCHECK(buffer.get());
   DCHECK(!decode_cb.is_null());
   CHECK_NE(state_, kUninitialized);
 
   DecodeCB decode_cb_bound = BindToCurrentLoop(decode_cb);
@@ skipping 158 matching lines @@
   if (!codec || avcodec_open2(codec_context_.get(), codec, NULL) < 0) {
     ReleaseFFmpegResources();
     return false;
   }
 
   av_frame_.reset(av_frame_alloc());
   return true;
 }
 
 }  // namespace media