Add support for midstream audio configuration changes.

media/filters/decoder_stream.cc

 // Copyright 2014 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/decoder_stream.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/debug/trace_event.h"
 #include "base/location.h"
@@ skipping 358 matching lines @@
   DCHECK_EQ(state_, STATE_PENDING_DEMUXER_READ) << state_;
   DCHECK_EQ(buffer.get() != NULL, status == DemuxerStream::kOk) << status;
   DCHECK(!read_cb_.is_null());
   DCHECK(stop_cb_.is_null());
 
   state_ = STATE_NORMAL;
 
   if (status == DemuxerStream::kConfigChanged) {
     FUNCTION_DVLOG(2) << ": " << "ConfigChanged";
     DCHECK(stream_->SupportsConfigChanges());
+
+    if (!config_change_observer_cb_.is_null())
+      config_change_observer_cb_.Run();
+
     state_ = STATE_FLUSHING_DECODER;
     if (!reset_cb_.is_null()) {
       AbortRead();
       // If we are using DecryptingDemuxerStream, we already called DDS::Reset()
       // which will continue the resetting process in it's callback.
       if (!decrypting_demuxer_stream_)
         Reset(base::ResetAndReturn(&reset_cb_));
       // Reinitialization will continue after Reset() is done.
     } else {
       FlushDecoder();
@@ skipping 129 matching lines @@
   stream_ = NULL;
   decoder_.reset();
   decrypting_demuxer_stream_.reset();
   base::ResetAndReturn(&stop_cb_).Run();
 }
 
 template class DecoderStream<DemuxerStream::VIDEO>;
 template class DecoderStream<DemuxerStream::AUDIO>;
 
 }  // namespace media