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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef MEDIA_FILTERS_DECRYPTING_AUDIO_DECODER_H_ | 5 #ifndef MEDIA_FILTERS_DECRYPTING_AUDIO_DECODER_H_ |
6 #define MEDIA_FILTERS_DECRYPTING_AUDIO_DECODER_H_ | 6 #define MEDIA_FILTERS_DECRYPTING_AUDIO_DECODER_H_ |
7 | 7 |
8 #include "base/callback.h" | 8 #include "base/callback.h" |
9 #include "base/memory/ref_counted.h" | 9 #include "base/memory/ref_counted.h" |
10 #include "media/base/audio_decoder.h" | 10 #include "media/base/audio_decoder.h" |
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24 // encrypted audio buffers and return decrypted and decompressed audio frames. | 24 // encrypted audio buffers and return decrypted and decompressed audio frames. |
25 // All public APIs and callbacks are trampolined to the |message_loop_| so | 25 // All public APIs and callbacks are trampolined to the |message_loop_| so |
26 // that no locks are required for thread safety. | 26 // that no locks are required for thread safety. |
27 // | 27 // |
28 // TODO(xhwang): For now, DecryptingAudioDecoder relies on the decryptor to do | 28 // TODO(xhwang): For now, DecryptingAudioDecoder relies on the decryptor to do |
29 // both decryption and audio decoding. Add the path to use the decryptor for | 29 // both decryption and audio decoding. Add the path to use the decryptor for |
30 // decryption only and use other AudioDecoder implementations within | 30 // decryption only and use other AudioDecoder implementations within |
31 // DecryptingAudioDecoder for audio decoding. | 31 // DecryptingAudioDecoder for audio decoding. |
32 class MEDIA_EXPORT DecryptingAudioDecoder : public AudioDecoder { | 32 class MEDIA_EXPORT DecryptingAudioDecoder : public AudioDecoder { |
33 public: | 33 public: |
34 // Callback to notify decryptor creation. | |
35 typedef base::Callback<void(Decryptor*)> DecryptorNotificationCB; | |
36 // Callback to request/cancel decryptor creation notification. | |
37 // Calling this callback with a non-null callback registers decryptor creation | |
38 // notification. When the decryptor is created, notification will be sent | |
39 // through the provided callback. | |
40 // Calling this callback with a null callback cancels previously registered | |
41 // decryptor creation notification. Any previously provided callback will be | |
42 // fired immediately with NULL. | |
43 typedef base::Callback<void(const DecryptorNotificationCB&)> | |
44 RequestDecryptorNotificationCB; | |
45 | |
46 DecryptingAudioDecoder( | 34 DecryptingAudioDecoder( |
47 const scoped_refptr<base::MessageLoopProxy>& message_loop, | 35 const scoped_refptr<base::MessageLoopProxy>& message_loop, |
48 const RequestDecryptorNotificationCB& request_decryptor_notification_cb); | 36 const SetDecryptorReadyCB& set_decryptor_ready_cb); |
49 | 37 |
50 // AudioDecoder implementation. | 38 // AudioDecoder implementation. |
51 virtual void Initialize(const scoped_refptr<DemuxerStream>& stream, | 39 virtual void Initialize(const scoped_refptr<DemuxerStream>& stream, |
52 const PipelineStatusCB& status_cb, | 40 const PipelineStatusCB& status_cb, |
53 const StatisticsCB& statistics_cb) OVERRIDE; | 41 const StatisticsCB& statistics_cb) OVERRIDE; |
54 virtual void Read(const ReadCB& read_cb) OVERRIDE; | 42 virtual void Read(const ReadCB& read_cb) OVERRIDE; |
55 virtual void Reset(const base::Closure& closure) OVERRIDE; | 43 virtual void Reset(const base::Closure& closure) OVERRIDE; |
56 virtual int bits_per_channel() OVERRIDE; | 44 virtual int bits_per_channel() OVERRIDE; |
57 virtual ChannelLayout channel_layout() OVERRIDE; | 45 virtual ChannelLayout channel_layout() OVERRIDE; |
58 virtual int samples_per_second() OVERRIDE; | 46 virtual int samples_per_second() OVERRIDE; |
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128 | 116 |
129 PipelineStatusCB init_cb_; | 117 PipelineStatusCB init_cb_; |
130 StatisticsCB statistics_cb_; | 118 StatisticsCB statistics_cb_; |
131 ReadCB read_cb_; | 119 ReadCB read_cb_; |
132 base::Closure reset_cb_; | 120 base::Closure reset_cb_; |
133 | 121 |
134 // Pointer to the demuxer stream that will feed us compressed buffers. | 122 // Pointer to the demuxer stream that will feed us compressed buffers. |
135 scoped_refptr<DemuxerStream> demuxer_stream_; | 123 scoped_refptr<DemuxerStream> demuxer_stream_; |
136 | 124 |
137 // Callback to request/cancel decryptor creation notification. | 125 // Callback to request/cancel decryptor creation notification. |
138 RequestDecryptorNotificationCB request_decryptor_notification_cb_; | 126 SetDecryptorReadyCB set_decryptor_ready_cb_; |
139 | 127 |
140 Decryptor* decryptor_; | 128 Decryptor* decryptor_; |
141 | 129 |
142 // The buffer returned by the demuxer that needs decrypting/decoding. | 130 // The buffer returned by the demuxer that needs decrypting/decoding. |
143 scoped_refptr<media::DecoderBuffer> pending_buffer_to_decode_; | 131 scoped_refptr<media::DecoderBuffer> pending_buffer_to_decode_; |
144 | 132 |
145 // Indicates the situation where new key is added during pending decode | 133 // Indicates the situation where new key is added during pending decode |
146 // (in other words, this variable can only be set in state kPendingDecode). | 134 // (in other words, this variable can only be set in state kPendingDecode). |
147 // If this variable is true and kNoKey is returned then we need to try | 135 // If this variable is true and kNoKey is returned then we need to try |
148 // decrypting/decoding again in case the newly added key is the correct | 136 // decrypting/decoding again in case the newly added key is the correct |
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160 | 148 |
161 base::TimeDelta output_timestamp_base_; | 149 base::TimeDelta output_timestamp_base_; |
162 int total_samples_decoded_; | 150 int total_samples_decoded_; |
163 | 151 |
164 DISALLOW_COPY_AND_ASSIGN(DecryptingAudioDecoder); | 152 DISALLOW_COPY_AND_ASSIGN(DecryptingAudioDecoder); |
165 }; | 153 }; |
166 | 154 |
167 } // namespace media | 155 } // namespace media |
168 | 156 |
169 #endif // MEDIA_FILTERS_DECRYPTING_AUDIO_DECODER_H_ | 157 #endif // MEDIA_FILTERS_DECRYPTING_AUDIO_DECODER_H_ |
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