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| 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 |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef MEDIA_CRYPTO_DECRYPTING_VIDEO_DECODER_H_ |
| 6 #define MEDIA_CRYPTO_DECRYPTING_VIDEO_DECODER_H_ |
| 7 |
| 8 #include "base/callback.h" |
| 9 #include "base/memory/ref_counted.h" |
| 10 #include "media/base/decryptor.h" |
| 11 #include "media/base/demuxer_stream.h" |
| 12 #include "media/base/video_decoder.h" |
| 13 |
| 14 namespace base { |
| 15 class MessageLoopProxy; |
| 16 } |
| 17 |
| 18 namespace media { |
| 19 |
| 20 class DecoderBuffer; |
| 21 class Decryptor; |
| 22 |
| 23 // Decryptor-based VideoDecoder implementation that can decrypt and decode |
| 24 // encrypted video buffers and return decrypted and decompressed video frames. |
| 25 // |
| 26 // TODO(xhwang): For now, DecryptingVideoDecoder relies on the decryptor to do |
| 27 // both decryption and video decoding. Add the path to use the decryptor for |
| 28 // decryption only and use other VideoDecoder implementations within |
| 29 // DecryptingVideoDecoder for video decoding. |
| 30 class MEDIA_EXPORT DecryptingVideoDecoder : public VideoDecoder { |
| 31 public: |
| 32 typedef base::Callback< |
| 33 scoped_refptr<base::MessageLoopProxy>()> MessageLoopFactoryCB; |
| 34 DecryptingVideoDecoder(const MessageLoopFactoryCB& message_loop_factory_cb, |
| 35 Decryptor* decryptor); |
| 36 |
| 37 // VideoDecoder implementation. |
| 38 virtual void Initialize(const scoped_refptr<DemuxerStream>& stream, |
| 39 const PipelineStatusCB& status_cb, |
| 40 const StatisticsCB& statistics_cb) OVERRIDE; |
| 41 virtual void Read(const ReadCB& read_cb) OVERRIDE; |
| 42 virtual void Reset(const base::Closure& closure) OVERRIDE; |
| 43 virtual void Stop(const base::Closure& closure) OVERRIDE; |
| 44 |
| 45 protected: |
| 46 virtual ~DecryptingVideoDecoder(); |
| 47 |
| 48 private: |
| 49 enum DecoderState { |
| 50 kUninitialized, |
| 51 kNormal, |
| 52 kDecodeFinished |
| 53 }; |
| 54 |
| 55 // Callback for Decryptor::InitializeVideoDecoder(). |
| 56 void OnDecoderInitialized(bool success); |
| 57 |
| 58 // Carries out the buffer reading operation scheduled by Read(). |
| 59 void DoRead(const ReadCB& read_cb); |
| 60 |
| 61 void ReadFromDemuxerStream(); |
| 62 |
| 63 // Callback for DemuxerStream::Read(). |
| 64 void DecryptAndDecodeBuffer(DemuxerStream::Status status, |
| 65 const scoped_refptr<DecoderBuffer>& buffer); |
| 66 |
| 67 // Carries out the buffer decrypting/decoding operation scheduled by |
| 68 // DecryptAndDecodeBuffer(). |
| 69 void DoDecryptAndDecodeBuffer(DemuxerStream::Status status, |
| 70 const scoped_refptr<DecoderBuffer>& buffer); |
| 71 |
| 72 // Callback for Decryptor::DecryptAndDecodeVideo(). |
| 73 void DeliverFrame(int buffer_size, |
| 74 Decryptor::Status status, |
| 75 const scoped_refptr<VideoFrame>& frame); |
| 76 |
| 77 // Carries out the frame delivery operation scheduled by DeliverFrame(). |
| 78 void DoDeliverFrame(int buffer_size, |
| 79 Decryptor::Status status, |
| 80 const scoped_refptr<VideoFrame>& frame); |
| 81 |
| 82 // Reset decoder and call |reset_cb_|. |
| 83 void DoReset(); |
| 84 |
| 85 // Free decoder resources and call |stop_cb_|. |
| 86 void DoStop(); |
| 87 |
| 88 // This is !is_null() iff Initialize() hasn't been called. |
| 89 MessageLoopFactoryCB message_loop_factory_cb_; |
| 90 |
| 91 scoped_refptr<base::MessageLoopProxy> message_loop_; |
| 92 DecoderState state_; |
| 93 PipelineStatusCB status_cb_; |
| 94 StatisticsCB statistics_cb_; |
| 95 ReadCB read_cb_; |
| 96 base::Closure reset_cb_; |
| 97 base::Closure stop_cb_; |
| 98 |
| 99 // Pointer to the demuxer stream that will feed us compressed buffers. |
| 100 scoped_refptr<DemuxerStream> demuxer_stream_; |
| 101 |
| 102 // Pointer to a Decryptor that can decrypt and decode encrypted video buffers. |
| 103 Decryptor* const decryptor_; |
| 104 |
| 105 DISALLOW_COPY_AND_ASSIGN(DecryptingVideoDecoder); |
| 106 }; |
| 107 |
| 108 } // namespace media |
| 109 |
| 110 #endif // MEDIA_CRYPTO_DECRYPTING_VIDEO_DECODER_H_ |
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