Encrypted Media: Support Audio Decrypt-Only.

media/filters/audio_renderer_impl.h

 // 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.
 
 // Audio rendering unit utilizing an AudioRendererSink to output data.
 //
 // This class lives inside three threads during it's lifetime, namely:
 // 1. Render thread.
 //    This object is created on the render thread.
 // 2. Pipeline thread
@@ skipping 11 matching lines @@
 
 #include <deque>
 
 #include "base/gtest_prod_util.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread_checker.h"
 #include "media/base/audio_decoder.h"
 #include "media/base/audio_renderer.h"
 #include "media/base/audio_renderer_sink.h"
 #include "media/base/buffers.h"
+#include "media/base/decryptor.h"
 #include "media/filters/audio_renderer_algorithm.h"
 
 namespace media {
 
+class AudioDecoderFactory;
 class AudioSplicer;
+class DecryptingDemuxerStream;
 
 class MEDIA_EXPORT AudioRendererImpl
     : public AudioRenderer,
-      NON_EXPORTED_BASE(public media::AudioRendererSink::RenderCallback) {
+      NON_EXPORTED_BASE(public AudioRendererSink::RenderCallback) {
  public:
   // Methods called on Render thread ------------------------------------------
   // An AudioRendererSink is used as the destination for the rendered audio.
-  explicit AudioRendererImpl(media::AudioRendererSink* sink);
+  explicit AudioRendererImpl(AudioRendererSink* sink);
 
   // Methods called on pipeline thread ----------------------------------------
   // AudioRenderer implementation.
-  virtual void Initialize(const scoped_refptr<DemuxerStream>& stream,
-                          const AudioDecoderList& decoders,
-                          const PipelineStatusCB& init_cb,
-                          const StatisticsCB& statistics_cb,
-                          const base::Closure& underflow_cb,
-                          const TimeCB& time_cb,
-                          const base::Closure& ended_cb,
-                          const base::Closure& disabled_cb,
-                          const PipelineStatusCB& error_cb) OVERRIDE;
+  virtual void Initialize(
+      const scoped_refptr<DemuxerStream>& stream,
+      const AudioDecoderList& decoders,
+      const RequestDecryptorNotificationCB& request_decryptor_notification_cb,
+      const PipelineStatusCB& init_cb,
+      const StatisticsCB& statistics_cb,
+      const base::Closure& underflow_cb,
+      const TimeCB& time_cb,
+      const base::Closure& ended_cb,
+      const base::Closure& disabled_cb,
+      const PipelineStatusCB& error_cb) OVERRIDE;
   virtual void Play(const base::Closure& callback) OVERRIDE;
   virtual void Pause(const base::Closure& callback) OVERRIDE;
   virtual void Flush(const base::Closure& callback) OVERRIDE;
   virtual void Stop(const base::Closure& callback) OVERRIDE;
   virtual void SetPlaybackRate(float rate) OVERRIDE;
   virtual void Preroll(base::TimeDelta time,
                        const PipelineStatusCB& cb) OVERRIDE;
   virtual void ResumeAfterUnderflow(bool buffer_more_audio) OVERRIDE;
   virtual void SetVolume(float volume) OVERRIDE;
 
@@ skipping 72 matching lines @@
   bool IsBeforePrerollTime(const scoped_refptr<Buffer>& buffer);
 
   // Pops the front of |decoders|, assigns it to |decoder_| and then
   // calls initialize on the new decoder.
   void InitializeNextDecoder(const scoped_refptr<DemuxerStream>& demuxer_stream,
                              scoped_ptr<AudioDecoderList> decoders);
 
   // Called when |decoder_| initialization completes.
   // |demuxer_stream| & |decoders| are used if initialization failed and
   // InitializeNextDecoder() needs to be called again.
-  void OnDecoderInitDone(const scoped_refptr<DemuxerStream>& demuxer_stream,
-                         scoped_ptr<AudioDecoderList> decoders,
-                         PipelineStatus status);
+  void OnDecoderInitDone(
+      const scoped_refptr<AudioDecoder>& audio_decoder,
+      const scoped_refptr<DecryptingDemuxerStream>& decrypting_demuxer_stream);
 
-  // Audio decoder.
+  scoped_ptr<AudioDecoderFactory> factory_;

[ddorwin, 2012/12/11 05:13:34]

decoder_factory_

[xhwang, 2012/12/11 19:43:04]

Will do.

[xhwang, 2012/12/12 23:43:28]

Done.

   scoped_refptr<AudioDecoder> decoder_;
+  scoped_refptr<DecryptingDemuxerStream> decrypting_demuxer_stream_;

[ddorwin, 2012/12/11 05:13:34]

Maybe explain when this is populated/valid.

[xhwang, 2012/12/11 19:43:04]

Will add comment.

[xhwang, 2012/12/12 23:43:28]

Done.

 
   scoped_ptr<AudioSplicer> splicer_;
 
   // The sink (destination) for rendered audio.  |sink_| must only be accessed
   // on the pipeline thread (verify with |pipeline_thread_checker_|).  |sink_|
   // must never be called under |lock_| or the 3-way thread bridge between the
   // audio, pipeline, and decoder threads may deadlock.
   scoped_refptr<media::AudioRendererSink> sink_;
 
   // Ensures certain methods are always called on the pipeline thread.
@@ skipping 77 matching lines @@
   // Variables used only on the audio thread. ---------------------------------
   int actual_frames_per_buffer_;
   scoped_array<uint8> audio_buffer_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioRendererImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_AUDIO_RENDERER_IMPL_H_