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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_VIDEO_DECODER_H_ | 5 #ifndef MEDIA_FILTERS_DECRYPTING_VIDEO_DECODER_H_ |
6 #define MEDIA_FILTERS_DECRYPTING_VIDEO_DECODER_H_ | 6 #define MEDIA_FILTERS_DECRYPTING_VIDEO_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/decryptor.h" | 10 #include "media/base/decryptor.h" |
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24 // encrypted video buffers and return decrypted and decompressed video frames. | 24 // encrypted video buffers and return decrypted and decompressed video 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, DecryptingVideoDecoder relies on the decryptor to do | 28 // TODO(xhwang): For now, DecryptingVideoDecoder relies on the decryptor to do |
29 // both decryption and video decoding. Add the path to use the decryptor for | 29 // both decryption and video decoding. Add the path to use the decryptor for |
30 // decryption only and use other VideoDecoder implementations within | 30 // decryption only and use other VideoDecoder implementations within |
31 // DecryptingVideoDecoder for video decoding. | 31 // DecryptingVideoDecoder for video decoding. |
32 class MEDIA_EXPORT DecryptingVideoDecoder : public VideoDecoder { | 32 class MEDIA_EXPORT DecryptingVideoDecoder : public VideoDecoder { |
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 DecryptingVideoDecoder( | 34 DecryptingVideoDecoder( |
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 // VideoDecoder implementation. | 38 // VideoDecoder 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 void Stop(const base::Closure& closure) OVERRIDE; | 44 virtual void Stop(const base::Closure& closure) OVERRIDE; |
57 | 45 |
58 protected: | 46 protected: |
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109 | 97 |
110 PipelineStatusCB init_cb_; | 98 PipelineStatusCB init_cb_; |
111 StatisticsCB statistics_cb_; | 99 StatisticsCB statistics_cb_; |
112 ReadCB read_cb_; | 100 ReadCB read_cb_; |
113 base::Closure reset_cb_; | 101 base::Closure reset_cb_; |
114 | 102 |
115 // Pointer to the demuxer stream that will feed us compressed buffers. | 103 // Pointer to the demuxer stream that will feed us compressed buffers. |
116 scoped_refptr<DemuxerStream> demuxer_stream_; | 104 scoped_refptr<DemuxerStream> demuxer_stream_; |
117 | 105 |
118 // Callback to request/cancel decryptor creation notification. | 106 // Callback to request/cancel decryptor creation notification. |
119 RequestDecryptorNotificationCB request_decryptor_notification_cb_; | 107 SetDecryptorReadyCB set_decryptor_ready_cb_; |
120 | 108 |
121 Decryptor* decryptor_; | 109 Decryptor* decryptor_; |
122 | 110 |
123 // The buffer returned by the demuxer that needs decrypting/decoding. | 111 // The buffer returned by the demuxer that needs decrypting/decoding. |
124 scoped_refptr<media::DecoderBuffer> pending_buffer_to_decode_; | 112 scoped_refptr<media::DecoderBuffer> pending_buffer_to_decode_; |
125 | 113 |
126 // Indicates the situation where new key is added during pending decode | 114 // Indicates the situation where new key is added during pending decode |
127 // (in other words, this variable can only be set in state kPendingDecode). | 115 // (in other words, this variable can only be set in state kPendingDecode). |
128 // If this variable is true and kNoKey is returned then we need to try | 116 // If this variable is true and kNoKey is returned then we need to try |
129 // decrypting/decoding again in case the newly added key is the correct | 117 // decrypting/decoding again in case the newly added key is the correct |
130 // decryption key. | 118 // decryption key. |
131 bool key_added_while_decode_pending_; | 119 bool key_added_while_decode_pending_; |
132 | 120 |
133 // A unique ID to trace Decryptor::DecryptAndDecodeVideo() call and the | 121 // A unique ID to trace Decryptor::DecryptAndDecodeVideo() call and the |
134 // matching DecryptCB call (in DoDeliverFrame()). | 122 // matching DecryptCB call (in DoDeliverFrame()). |
135 uint32 trace_id_; | 123 uint32 trace_id_; |
136 | 124 |
137 DISALLOW_COPY_AND_ASSIGN(DecryptingVideoDecoder); | 125 DISALLOW_COPY_AND_ASSIGN(DecryptingVideoDecoder); |
138 }; | 126 }; |
139 | 127 |
140 } // namespace media | 128 } // namespace media |
141 | 129 |
142 #endif // MEDIA_FILTERS_DECRYPTING_VIDEO_DECODER_H_ | 130 #endif // MEDIA_FILTERS_DECRYPTING_VIDEO_DECODER_H_ |
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