[Chromecast] Add support for different playback rates to ALSA backend

chromecast/media/cma/decoder/cast_audio_decoder_linux.cc

 // Copyright 2015 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 "chromecast/media/cma/decoder/cast_audio_decoder.h"
 
 #include <stdint.h>
 #include <limits>
 #include <queue>
 #include <utility>
@@ skipping 67 matching lines @@
   }
 
   // CastAudioDecoder implementation:
   bool Decode(const scoped_refptr<media::DecoderBufferBase>& data,
               const DecodeCallback& decode_callback) override {
     DCHECK(!decode_callback.is_null());
     DCHECK(task_runner_->BelongsToCurrentThread());
 
     if (data->decrypt_context() != nullptr) {
       LOG(ERROR) << "Audio decoder doesn't support encrypted stream";
-      decode_callback.Run(kDecodeError, data);
+      // Post the task to ensure that |decode_callback| is not called from
+      // within a call to Decode().
+      task_runner_->PostTask(FROM_HERE,
+                             base::Bind(decode_callback, kDecodeError, data));
     } else if (!initialized_ || decode_pending_) {
       decode_queue_.push(std::make_pair(data, decode_callback));
     } else {
       DecodeNow(data, decode_callback);
     }
     return true;
   }
 
  private:
   typedef std::pair<scoped_refptr<media::DecoderBufferBase>, DecodeCallback>
@@ skipping 172 matching lines @@
       return 2;
     case CastAudioDecoder::OutputFormat::kOutputPlanarFloat:
       return 4;
   }
   NOTREACHED();
   return 1;
 }
 
 }  // namespace media
 }  // namespace chromecast