Encrypted Media: Support Audio Decrypt-Only.

media/filters/audio_decoder_factory.h

Index: media/filters/audio_decoder_factory.h
diff --git a/media/filters/audio_decoder_factory.h b/media/filters/audio_decoder_factory.h
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index 0000000000000000000000000000000000000000..f1187e603d4e4e38325212a62ed17cad089206f7
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+++ b/media/filters/audio_decoder_factory.h
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+// 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.
+
+#ifndef MEDIA_FILTERS_AUDIO_DECODER_FACTORY_H_
+#define MEDIA_FILTERS_AUDIO_DECODER_FACTORY_H_
+
+#include <list>
+
+#include "base/callback.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "media/base/audio_decoder.h"
+#include "media/base/decryptor.h"
+#include "media/base/demuxer_stream.h"
+
+namespace base {
+class MessageLoopProxy;
+}
+
+namespace media {
+
+class DecoderBuffer;
+class DecryptingDemuxerStream;
+class Decryptor;
+
+// AudioDecoderFactory (creates if necessary and) initializes the proper
+// AudioDecoder for a given DemuxerStream. If the given DemuxerStream is
+// encrypted, a DecryptingDemuxerStream may also be created.
+class MEDIA_EXPORT AudioDecoderFactory {
+ public:
+  typedef std::list<scoped_refptr<AudioDecoder> > AudioDecoderList;
+
+  typedef base::Callback<
+      void(const scoped_refptr<AudioDecoder>&,
+           const scoped_refptr<DecryptingDemuxerStream>&)> InitDoneCB;
+
+  AudioDecoderFactory(
+      const scoped_refptr<base::MessageLoopProxy>& message_loop,
+      const AudioDecoderList& precreated_decoders,
+      const RequestDecryptorNotificationCB& request_decryptor_notification_cb);
+  ~AudioDecoderFactory();
+
+  void InitAudioDecoder(const scoped_refptr<DemuxerStream>& stream,
+                        const StatisticsCB& statistics_cb,
+                        InitDoneCB init_done_cb);
+
+ private:
+  void OnDecryptingAudioDecoderInitDone(PipelineStatus status);
+  void OnDecryptingDemuxerStreamInitDone(PipelineStatus status);
+  void InitializeNextDecoder();
+  void OnDecoderInitDone(PipelineStatus status);
+
+  scoped_refptr<base::MessageLoopProxy> message_loop_;
+  AudioDecoderList precreated_decoders_;
+  RequestDecryptorNotificationCB request_decryptor_notification_cb_;
+
+  scoped_refptr<DemuxerStream> input_stream_;
+  StatisticsCB statistics_cb_;
+  InitDoneCB init_done_cb_;
+
+  scoped_refptr<AudioDecoder> audio_decoder_;
+  scoped_refptr<DecryptingDemuxerStream> decrypted_stream_;
+
+  base::WeakPtrFactory<AudioDecoderFactory> weak_ptr_factory_;
+  base::WeakPtr<AudioDecoderFactory> weak_this_;
+
+  DISALLOW_COPY_AND_ASSIGN(AudioDecoderFactory);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_FILTERS_AUDIO_DECODER_FACTORY_H_