1 // Copyright 2013 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_CDM_PPAPI_CLEAR_KEY_CDM_H_ 6 #define MEDIA_CDM_PPAPI_CLEAR_KEY_CDM_H_ 7 8 #include <string> 9 #include <vector> 10 11 #include "base/basictypes.h" 12 #include "base/compiler_specific.h" 13 #include "base/memory/ref_counted.h" 14 #include "base/memory/scoped_ptr.h" 15 #include "base/synchronization/lock.h" 16 #include "media/cdm/aes_decryptor.h" 17 #include "media/cdm/ppapi/api/content_decryption_module.h" 18 19 // Enable this to use the fake decoder for testing. 20 // TODO(tomfinegan): Move fake audio decoder into a separate class. 21 #if 0 22 #define CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER 23 #endif 24 25 namespace media { 26 class CdmVideoDecoder; 27 class DecoderBuffer; 28 class FFmpegCdmAudioDecoder; 29 30 // Clear key implementation of the cdm::ContentDecryptionModule interface. 31 class ClearKeyCdm : public cdm::ContentDecryptionModule { 32 public: 33 explicit ClearKeyCdm(cdm::Host* host); 34 virtual ~ClearKeyCdm(); 35 36 // ContentDecryptionModule implementation. 37 virtual cdm::Status GenerateKeyRequest( 38 const char* type, int type_size, 39 const uint8_t* init_data, int init_data_size) OVERRIDE; 40 virtual cdm::Status AddKey(const char* session_id, int session_id_size, 41 const uint8_t* key, int key_size, 42 const uint8_t* key_id, int key_id_size) OVERRIDE; 43 virtual cdm::Status CancelKeyRequest(const char* session_id, 44 int session_id_size) OVERRIDE; 45 virtual void TimerExpired(void* context) OVERRIDE; 46 virtual cdm::Status Decrypt(const cdm::InputBuffer& encrypted_buffer, 47 cdm::DecryptedBlock* decrypted_block) OVERRIDE; 48 virtual cdm::Status InitializeAudioDecoder( 49 const cdm::AudioDecoderConfig& audio_decoder_config) OVERRIDE; 50 virtual cdm::Status InitializeVideoDecoder( 51 const cdm::VideoDecoderConfig& video_decoder_config) OVERRIDE; 52 virtual void DeinitializeDecoder(cdm::StreamType decoder_type) OVERRIDE; 53 virtual void ResetDecoder(cdm::StreamType decoder_type) OVERRIDE; 54 virtual cdm::Status DecryptAndDecodeFrame( 55 const cdm::InputBuffer& encrypted_buffer, 56 cdm::VideoFrame* video_frame) OVERRIDE; 57 virtual cdm::Status DecryptAndDecodeSamples( 58 const cdm::InputBuffer& encrypted_buffer, 59 cdm::AudioFrames* audio_frames) OVERRIDE; 60 virtual void Destroy() OVERRIDE; 61 62 private: 63 // TODO(xhwang): After we removed DecryptorClient. We probably can also remove 64 // this Client class as well. Investigate this possibility. 65 class Client { 66 public: 67 enum Status { 68 kKeyAdded, 69 kKeyError, 70 kKeyMessage 71 }; 72 73 Client(); 74 virtual ~Client(); 75 76 Status status() { return status_; } 77 const std::string& session_id() { return session_id_; } 78 const std::vector<uint8>& key_message() { return key_message_; } 79 const std::string& default_url() { return default_url_; } 80 81 // Resets the Client to a clean state. 82 void Reset(); 83 84 void KeyAdded(const std::string& session_id); 85 void KeyError(const std::string& session_id, 86 MediaKeys::KeyError error_code, 87 int system_code); 88 void KeyMessage(const std::string& session_id, 89 const std::vector<uint8>& message, 90 const std::string& default_url); 91 92 private: 93 Status status_; 94 std::string session_id_; 95 std::vector<uint8> key_message_; 96 std::string default_url_; 97 }; 98 99 // Prepares next heartbeat message and sets a timer for it. 100 void ScheduleNextHeartBeat(); 101 102 // Decrypts the |encrypted_buffer| and puts the result in |decrypted_buffer|. 103 // Returns cdm::kSuccess if decryption succeeded. The decrypted result is 104 // put in |decrypted_buffer|. If |encrypted_buffer| is empty, the 105 // |decrypted_buffer| is set to an empty (EOS) buffer. 106 // Returns cdm::kNoKey if no decryption key was available. In this case 107 // |decrypted_buffer| should be ignored by the caller. 108 // Returns cdm::kDecryptError if any decryption error occurred. In this case 109 // |decrypted_buffer| should be ignored by the caller. 110 cdm::Status DecryptToMediaDecoderBuffer( 111 const cdm::InputBuffer& encrypted_buffer, 112 scoped_refptr<DecoderBuffer>* decrypted_buffer); 113 114 #if defined(CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER) 115 int64 CurrentTimeStampInMicroseconds() const; 116 117 // Generates fake video frames with |duration_in_microseconds|. 118 // Returns the number of samples generated in the |audio_frames|. 119 int GenerateFakeAudioFramesFromDuration(int64 duration_in_microseconds, 120 cdm::AudioFrames* audio_frames) const; 121 122 // Generates fake video frames given |input_timestamp|. 123 // Returns cdm::kSuccess if any audio frame is successfully generated. 124 cdm::Status GenerateFakeAudioFrames(int64 timestamp_in_microseconds, 125 cdm::AudioFrames* audio_frames); 126 #endif // CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER 127 128 Client client_; 129 AesDecryptor decryptor_; 130 131 // Protects the |client_| from being accessed by the |decryptor_| 132 // simultaneously. 133 base::Lock client_lock_; 134 135 cdm::Host* host_; 136 137 std::string heartbeat_session_id_; 138 std::string next_heartbeat_message_; 139 140 // Timer delay in milliseconds for the next host_->SetTimer() call. 141 int64 timer_delay_ms_; 142 143 // Indicates whether a timer has been set to prevent multiple timers from 144 // running. 145 bool timer_set_; 146 147 #if defined(CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER) 148 int channel_count_; 149 int bits_per_channel_; 150 int samples_per_second_; 151 int64 output_timestamp_base_in_microseconds_; 152 int total_samples_generated_; 153 #endif // CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER 154 155 #if defined(CLEAR_KEY_CDM_USE_FFMPEG_DECODER) 156 scoped_ptr<FFmpegCdmAudioDecoder> audio_decoder_; 157 #endif // CLEAR_KEY_CDM_USE_FFMPEG_DECODER 158 159 scoped_ptr<CdmVideoDecoder> video_decoder_; 160 161 DISALLOW_COPY_AND_ASSIGN(ClearKeyCdm); 162 }; 163 164 } // namespace media 165 166 #endif // MEDIA_CDM_PPAPI_CLEAR_KEY_CDM_H_ 167
