Reland: Add Stop() to AudioDecoder. (https://codereview.chromium.org/126793002/)

media/filters/audio_renderer_impl.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/audio_renderer_impl.h"
 
 #include <math.h>
 
 #include <algorithm>
 
@@ skipping 129 matching lines @@
 }
 
 void AudioRendererImpl::DoFlush_Locked() {
   DCHECK(task_runner_->BelongsToCurrentThread());
   lock_.AssertAcquired();
 
   DCHECK(!pending_read_);
   DCHECK_EQ(state_, kPaused);
 
   if (decrypting_demuxer_stream_) {
-    decrypting_demuxer_stream_->Reset(BindToCurrentLoop(
-        base::Bind(&AudioRendererImpl::ResetDecoder, weak_this_)));
+    decrypting_demuxer_stream_->Reset(
+        base::Bind(&AudioRendererImpl::ResetDecoder, weak_this_));
     return;
   }
 
   ResetDecoder();
 }
 
 void AudioRendererImpl::ResetDecoder() {
   DCHECK(task_runner_->BelongsToCurrentThread());
-  decoder_->Reset(BindToCurrentLoop(
-      base::Bind(&AudioRendererImpl::ResetDecoderDone, weak_this_)));
+  decoder_->Reset(base::Bind(&AudioRendererImpl::ResetDecoderDone, weak_this_));
 }
 
 void AudioRendererImpl::ResetDecoderDone() {
-  base::AutoLock auto_lock(lock_);
-  if (state_ == kStopped)
-    return;
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  {
+    base::AutoLock auto_lock(lock_);
+    if (state_ == kStopped)
+      return;
 
-  DCHECK_EQ(state_, kPaused);
-  DCHECK(!flush_cb_.is_null());
+    DCHECK_EQ(state_, kPaused);
+    DCHECK(!flush_cb_.is_null());
 
-  audio_time_buffered_ = kNoTimestamp();
-  current_time_ = kNoTimestamp();
-  received_end_of_stream_ = false;
-  rendered_end_of_stream_ = false;
-  preroll_aborted_ = false;
+    audio_time_buffered_ = kNoTimestamp();
+    current_time_ = kNoTimestamp();
+    received_end_of_stream_ = false;
+    rendered_end_of_stream_ = false;
+    preroll_aborted_ = false;
 
-  earliest_end_time_ = now_cb_.Run();
-  splicer_->Reset();
-  algorithm_->FlushBuffers();
-
+    earliest_end_time_ = now_cb_.Run();
+    splicer_->Reset();
+    algorithm_->FlushBuffers();
+  }
   base::ResetAndReturn(&flush_cb_).Run();
 }
 
 void AudioRendererImpl::Stop(const base::Closure& callback) {
   DCHECK(task_runner_->BelongsToCurrentThread());
   DCHECK(!callback.is_null());
 
   // TODO(scherkus): Consider invalidating |weak_factory_| and replacing
   // task-running guards that check |state_| with DCHECK().
 
   if (sink_) {
     sink_->Stop();
     sink_ = NULL;
   }
 
+  if (state_ == kUninitialized) {

[DaleCurtis, 2014/01/21 22:20:26]

If uninitialized there shouldn't be any reason to call abort? VRI has a
kInitializing state which might be good to add here to indicate Initialize is in
progress.  Otherwise this seems wrong since you never transition to kStopped
despite a potential in flight Initialize.

+    decoder_selector_->Abort();
+    callback.Run();
+    return;
+  }
+
   {
     base::AutoLock auto_lock(lock_);
+    if (state_ == kStopped)
+      return;
+
     ChangeState_Locked(kStopped);
-    algorithm_.reset(NULL);
-    init_cb_.Reset();
+    algorithm_.reset();
     underflow_cb_.Reset();
     time_cb_.Reset();
     flush_cb_.Reset();
   }
 
+  if (decoder_) {
+    decoder_->Stop(callback);
+    return;
+  }
+
   callback.Run();
 }
 
 void AudioRendererImpl::Preroll(base::TimeDelta time,
                                 const PipelineStatusCB& cb) {
   DCHECK(task_runner_->BelongsToCurrentThread());
 
   base::AutoLock auto_lock(lock_);
   DCHECK(!sink_playing_);
   DCHECK_EQ(state_, kPaused);
@@ skipping 46 matching lines @@
 void AudioRendererImpl::OnDecoderSelected(
     scoped_ptr<AudioDecoder> decoder,
     scoped_ptr<DecryptingDemuxerStream> decrypting_demuxer_stream) {
   DCHECK(task_runner_->BelongsToCurrentThread());
 
   base::AutoLock auto_lock(lock_);
   scoped_ptr<AudioDecoderSelector> deleter(decoder_selector_.Pass());
 
   if (state_ == kStopped) {
     DCHECK(!sink_);
+    base::ResetAndReturn(&init_cb_).Run(PIPELINE_ERROR_ABORT);
     return;
   }
 
   if (!decoder) {
     base::ResetAndReturn(&init_cb_).Run(DECODER_ERROR_NOT_SUPPORTED);
     return;
   }
 
   decoder_ = decoder.Pass();
   decrypting_demuxer_stream_ = decrypting_demuxer_stream.Pass();
@@ skipping 417 matching lines @@
   }
 }
 
 void AudioRendererImpl::ChangeState_Locked(State new_state) {
   DVLOG(1) << __FUNCTION__ << " : " << state_ << " -> " << new_state;
   lock_.AssertAcquired();
   state_ = new_state;
 }
 
 }  // namespace media