Add FFmpeg audio decoder for the clear key CDM.

webkit/media/crypto/ppapi/clear_key_cdm.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.
 
 #ifndef WEBKIT_MEDIA_CRYPTO_PPAPI_CLEAR_KEY_CDM_H_
 #define WEBKIT_MEDIA_CRYPTO_PPAPI_CLEAR_KEY_CDM_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/lock.h"
+#include "media/base/channel_layout.h"
 #include "media/base/decryptor_client.h"
 #include "media/crypto/aes_decryptor.h"
 #include "webkit/media/crypto/ppapi/content_decryption_module.h"
 
 // Enable this to use the fake decoder for testing.
-// #define CLEAR_KEY_CDM_USE_FAKE_VIDEO_DECODER
+#if 0
+#define CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER
+#endif
+
+#if 0
+#define CLEAR_KEY_CDM_USE_FAKE_VIDEO_DECODER
+#endif
 
 #if defined(CLEAR_KEY_CDM_USE_FAKE_VIDEO_DECODER)
 #undef CLEAR_KEY_CDM_USE_FFMPEG_DECODER
 #endif
 
 namespace media {
 class DecoderBuffer;
 }
 
 namespace webkit_media {
 
+class FFmpegCdmAudioDecoder;
 class FFmpegCdmVideoDecoder;
 
 // Clear key implementation of the cdm::ContentDecryptionModule interface.
 class ClearKeyCdm : public cdm::ContentDecryptionModule {
  public:
   explicit ClearKeyCdm(cdm::Allocator* allocator, cdm::CdmHost*);
   virtual ~ClearKeyCdm();
 
   // ContentDecryptionModule implementation.
   virtual cdm::Status GenerateKeyRequest(
@@ skipping 15 matching lines @@
       const cdm::AudioDecoderConfig& audio_decoder_config) OVERRIDE;
   virtual cdm::Status InitializeVideoDecoder(
       const cdm::VideoDecoderConfig& video_decoder_config) OVERRIDE;
   virtual void DeinitializeDecoder(cdm::StreamType decoder_type) OVERRIDE;
   virtual void ResetDecoder(cdm::StreamType decoder_type) OVERRIDE;
   virtual cdm::Status DecryptAndDecodeFrame(
       const cdm::InputBuffer& encrypted_buffer,
       cdm::VideoFrame* video_frame) OVERRIDE;
   virtual cdm::Status DecryptAndDecodeSamples(
       const cdm::InputBuffer& encrypted_buffer,
-      cdm::Buffer* sample_buffer) OVERRIDE;
+      cdm::AudioFrames* audio_frames) OVERRIDE;
 
  private:
   class Client : public media::DecryptorClient {
    public:
     enum Status {
       kKeyAdded,
       kKeyError,
       kKeyMessage,
       kNeedKey
     };
@@ skipping 40 matching lines @@
   // put in |decrypted_buffer|. If |encrypted_buffer| is empty, the
   // |decrypted_buffer| is set to an empty (EOS) buffer.
   // Returns cdm::kNoKey if no decryption key was available. In this case
   // |decrypted_buffer| should be ignored by the caller.
   // Returns cdm::kDecryptError if any decryption error occurred. In this case
   // |decrypted_buffer| should be ignored by the caller.
   cdm::Status DecryptToMediaDecoderBuffer(
       const cdm::InputBuffer& encrypted_buffer,
       scoped_refptr<media::DecoderBuffer>* decrypted_buffer);
 
+#if defined(CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER)
+  void GenerateFakeAudioFrames(cdm::AudioFrames* audio_frames);
+#endif  // CLEAR_KEY_CDM_USE_FAKE_VIDEO_DECODER
+
 #if defined(CLEAR_KEY_CDM_USE_FAKE_VIDEO_DECODER)
   void GenerateFakeVideoFrame(base::TimeDelta timestamp,
                               cdm::VideoFrame* video_frame);
 #endif  // CLEAR_KEY_CDM_USE_FAKE_VIDEO_DECODER
 
   Client client_;
   media::AesDecryptor decryptor_;
 
   // Protects the |client_| from being accessed by the |decryptor_|
   // simultaneously.
   base::Lock client_lock_;
 
   cdm::Allocator* const allocator_;
 
+#if defined(CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER)
+  int channel_count_;
+  int bits_per_channel_;
+  int samples_per_second_;
+  base::TimeDelta last_timestamp_;
+  base::TimeDelta last_duration_;
+#endif  // CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER
+
 #if defined(CLEAR_KEY_CDM_USE_FFMPEG_DECODER)
+  scoped_ptr<FFmpegCdmAudioDecoder> audio_decoder_;
   scoped_ptr<FFmpegCdmVideoDecoder> video_decoder_;
-#endif
+#endif  // CLEAR_KEY_CDM_USE_FFMPEG_DECODER
 
 #if defined(CLEAR_KEY_CDM_USE_FAKE_VIDEO_DECODER)
   cdm::Size video_size_;
 #endif  // CLEAR_KEY_CDM_USE_FAKE_VIDEO_DECODER
 };
 
 }  // namespace webkit_media
 
 #endif  // WEBKIT_MEDIA_CRYPTO_PPAPI_CLEAR_KEY_CDM_H_