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

media/filters/opus_audio_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/opus_audio_decoder.h"
 
 #include <cmath>
 
 #include "base/single_thread_task_runner.h"
 #include "base/sys_byteorder.h"
@@ skipping 236 matching lines @@
     const scoped_refptr<base::SingleThreadTaskRunner>& task_runner)
     : task_runner_(task_runner),
       opus_decoder_(NULL),
       start_input_timestamp_(kNoTimestamp()) {}
 
 std::string OpusAudioDecoder::GetDisplayName() const {
   return "OpusAudioDecoder";
 }
 
 void OpusAudioDecoder::Initialize(const AudioDecoderConfig& config,
-                                  const PipelineStatusCB& status_cb,
+                                  const InitCB& init_cb,
                                   const OutputCB& output_cb) {
   DCHECK(task_runner_->BelongsToCurrentThread());
-  PipelineStatusCB initialize_cb = BindToCurrentLoop(status_cb);
+  InitCB bound_init_cb = BindToCurrentLoop(init_cb);
 
   config_ = config;
   output_cb_ = BindToCurrentLoop(output_cb);
 
   if (!ConfigureDecoder()) {
-    initialize_cb.Run(DECODER_ERROR_NOT_SUPPORTED);
+    bound_init_cb.Run(false);
     return;
   }
 
-  initialize_cb.Run(PIPELINE_OK);
+  bound_init_cb.Run(true);
 }
 
 void OpusAudioDecoder::Decode(const scoped_refptr<DecoderBuffer>& buffer,
                               const DecodeCB& decode_cb) {
   DCHECK(task_runner_->BelongsToCurrentThread());
   DCHECK(!decode_cb.is_null());
 
   DecodeBuffer(buffer, BindToCurrentLoop(decode_cb));
 }
 
@@ skipping 197 matching lines @@
     output_buffer->get()->TrimEnd(trim_frames);
 
   // Handles discards and timestamping.  Discard the buffer if more data needed.
   if (!discard_helper_->ProcessBuffers(input, *output_buffer))
     *output_buffer = NULL;
 
   return true;
 }
 
 }  // namespace media