1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
|
// 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/crypto/aes_decryptor.h"
#include "webkit/media/crypto/ppapi/cdm/content_decryption_module.h"
// Enable this to use the fake decoder for testing.
// TODO(tomfinegan): Move fake audio decoder into a separate class.
#if 0
#define CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER
#endif
namespace media {
class DecoderBuffer;
}
namespace webkit_media {
class CdmVideoDecoder;
class FFmpegCdmAudioDecoder;
// Clear key implementation of the cdm::ContentDecryptionModule interface.
class ClearKeyCdm : public cdm::ContentDecryptionModule {
public:
ClearKeyCdm(cdm::Allocator* allocator, cdm::Host* host);
virtual ~ClearKeyCdm();
// ContentDecryptionModule implementation.
virtual cdm::Status GenerateKeyRequest(
const char* type, int type_size,
const uint8_t* init_data, int init_data_size) OVERRIDE;
virtual cdm::Status AddKey(const char* session_id, int session_id_size,
const uint8_t* key, int key_size,
const uint8_t* key_id, int key_id_size) OVERRIDE;
virtual cdm::Status CancelKeyRequest(const char* session_id,
int session_id_size) OVERRIDE;
virtual void TimerExpired(void* context) OVERRIDE;
virtual cdm::Status Decrypt(const cdm::InputBuffer& encrypted_buffer,
cdm::DecryptedBlock* decrypted_block) OVERRIDE;
virtual cdm::Status InitializeAudioDecoder(
const cdm::AudioDecoderConfig& audio_decoder_config) OVERRIDE;
virtual cdm::Status InitializeVideoDecoder(
const cdm::VideoDecoderConfig& video_decoder_config) OVERRIDE;
virtual void DeinitializeDecoder(cdm::StreamType decoder_type) OVERRIDE;
virtual void ResetDecoder(cdm::StreamType decoder_type) OVERRIDE;
virtual cdm::Status DecryptAndDecodeFrame(
const cdm::InputBuffer& encrypted_buffer,
cdm::VideoFrame* video_frame) OVERRIDE;
virtual cdm::Status DecryptAndDecodeSamples(
const cdm::InputBuffer& encrypted_buffer,
cdm::AudioFrames* audio_frames) OVERRIDE;
private:
// TODO(xhwang): After we removed DecryptorClient. We probably can also remove
// this Client class as well. Investigate this possibility.
class Client {
public:
enum Status {
kKeyAdded,
kKeyError,
kKeyMessage,
kNeedKey
};
Client();
virtual ~Client();
Status status() { return status_; }
const std::string& session_id() { return session_id_; }
const std::string& key_message() { return key_message_; }
const std::string& default_url() { return default_url_; }
// Resets the Client to a clean state.
void Reset();
void KeyAdded(const std::string& key_system, const std::string& session_id);
void KeyError(const std::string& key_system,
const std::string& session_id,
media::Decryptor::KeyError error_code,
int system_code);
void KeyMessage(const std::string& key_system,
const std::string& session_id,
const std::string& message,
const std::string& default_url);
void NeedKey(const std::string& key_system,
const std::string& session_id,
const std::string& type,
scoped_array<uint8> init_data, int init_data_length);
private:
Status status_;
std::string session_id_;
std::string key_message_;
std::string default_url_;
};
// Prepares next heartbeat message and sets a timer for it.
void ScheduleNextHeartBeat();
// Decrypts the |encrypted_buffer| and puts the result in |decrypted_buffer|.
// Returns cdm::kSuccess if decryption succeeded. The decrypted result is
// 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)
int64 CurrentTimeStampInMicroseconds() const;
// Generates fake video frames with |duration_in_microseconds|.
// Returns the number of samples generated in the |audio_frames|.
int GenerateFakeAudioFramesFromDuration(int64 duration_in_microseconds,
cdm::AudioFrames* audio_frames) const;
// Generates fake video frames given |input_timestamp|.
// Returns cdm::kSuccess if any audio frame is successfully generated.
cdm::Status GenerateFakeAudioFrames(int64 timestamp_in_microseconds,
cdm::AudioFrames* audio_frames);
#endif // CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER
Client client_;
media::AesDecryptor decryptor_;
// Protects the |client_| from being accessed by the |decryptor_|
// simultaneously.
base::Lock client_lock_;
cdm::Allocator* const allocator_;
cdm::Host* host_;
std::string heartbeat_session_id_;
std::string next_heartbeat_message_;
// Timer delay in milliseconds for the next host_->SetTimer() call.
int64 timer_delay_ms_;
// Indicates whether a timer has been set to prevent multiple timers from
// running.
bool timer_set_;
#if defined(CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER)
int channel_count_;
int bits_per_channel_;
int samples_per_second_;
int64 output_timestamp_base_in_microseconds_;
int total_samples_generated_;
#endif // CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER
#if defined(CLEAR_KEY_CDM_USE_FFMPEG_DECODER)
scoped_ptr<FFmpegCdmAudioDecoder> audio_decoder_;
#endif // CLEAR_KEY_CDM_USE_FFMPEG_DECODER
scoped_ptr<CdmVideoDecoder> video_decoder_;
DISALLOW_COPY_AND_ASSIGN(ClearKeyCdm);
};
} // namespace webkit_media
#endif // WEBKIT_MEDIA_CRYPTO_PPAPI_CLEAR_KEY_CDM_H_
|
