Fake clear key CDM audio decoder.

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"

[Tom Finegan, 2012/10/24 02:27:19]

What's this for?

[xhwang, 2012/10/24 16:40:39]

Done.

 #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)

[Tom Finegan, 2012/10/24 02:27:19]

|| defined (CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER)?

[xhwang, 2012/10/24 16:40:39]

Hmm, for best testing coverage, I want to use the fake audio decoder w/ the
FFmpeg video decoder and vice versa. Not sure what's the best way to do that
though.

[Tom Finegan, 2012/10/24 18:06:09]

I'll define CLEAR_KEY_CDM_USE_FFMPEG_AUDIO_DECODER
CLEAR_KEY_CDM_USE_FFMPEG_VIDEO_DECODER in the gyp in my CL, and update this to
handle the separate flags.

If that ends up being too ugly we can discuss it more in
http://codereview.chromium.org/11260007/

[ddorwin, 2012/10/24 18:09:31]

Please don't. I want to avoid polluting the gyp unnecessarily. Let's land both
of these then look at how we can fix this in a separate CL with less code.

One of you please add a TODO to do so.

 #undef CLEAR_KEY_CDM_USE_FFMPEG_DECODER
 #endif
 
 namespace media {
 class DecoderBuffer;
 }
 
 namespace webkit_media {
 
 class FFmpegCdmVideoDecoder;
@@ skipping 85 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<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_