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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 #include "media/webm/webm_cluster_parser.h" | 5 #include "media/webm/webm_cluster_parser.h" |
6 | 6 |
7 #include "base/logging.h" | 7 #include "base/logging.h" |
| 8 #include "base/sys_byteorder.h" |
8 #include "media/base/data_buffer.h" | 9 #include "media/base/data_buffer.h" |
9 #include "media/base/decrypt_config.h" | 10 #include "media/base/decrypt_config.h" |
10 #include "media/webm/webm_constants.h" | 11 #include "media/webm/webm_constants.h" |
11 | 12 |
12 namespace media { | 13 namespace media { |
13 | 14 |
14 WebMClusterParser::WebMClusterParser(int64 timecode_scale, | 15 WebMClusterParser::WebMClusterParser(int64 timecode_scale, |
15 int audio_track_num, | 16 int audio_track_num, |
16 int video_track_num, | 17 int video_track_num, |
17 const uint8* video_encryption_key_id, | 18 const uint8* video_encryption_key_id, |
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180 if (last_block_timecode_ != -1 && timecode < last_block_timecode_) { | 181 if (last_block_timecode_ != -1 && timecode < last_block_timecode_) { |
181 DVLOG(1) << "Got a block with a timecode before the previous block."; | 182 DVLOG(1) << "Got a block with a timecode before the previous block."; |
182 return false; | 183 return false; |
183 } | 184 } |
184 | 185 |
185 last_block_timecode_ = timecode; | 186 last_block_timecode_ = timecode; |
186 | 187 |
187 base::TimeDelta timestamp = base::TimeDelta::FromMicroseconds( | 188 base::TimeDelta timestamp = base::TimeDelta::FromMicroseconds( |
188 (cluster_timecode_ + timecode) * timecode_multiplier_); | 189 (cluster_timecode_ + timecode) * timecode_multiplier_); |
189 | 190 |
| 191 bool encrypted = track_num == video_.track_num() && |
| 192 video_encryption_key_id_.get(); |
| 193 |
190 // The first bit of the flags is set when the block contains only keyframes. | 194 // The first bit of the flags is set when the block contains only keyframes. |
191 // http://www.matroska.org/technical/specs/index.html | 195 // http://www.matroska.org/technical/specs/index.html |
192 bool is_keyframe = (flags & 0x80) != 0; | 196 bool is_keyframe = (flags & 0x80) != 0; |
193 scoped_refptr<StreamParserBuffer> buffer = | 197 scoped_refptr<StreamParserBuffer> buffer = |
194 StreamParserBuffer::CopyFrom(data, size, is_keyframe); | 198 StreamParserBuffer::CopyFrom(data, size, is_keyframe); |
195 | 199 |
196 if (track_num == video_.track_num() && video_encryption_key_id_.get()) { | 200 if (encrypted) { |
| 201 // Every encrypted Block has an HMAC and IV prepended to it. Current WebM |
| 202 // encrypted request for comments specification is here |
| 203 // http://wiki.webmproject.org/encryption/webm-encryption-rfc. |
| 204 uint64 network_iv; |
| 205 memcpy(&network_iv, |
| 206 data + DecryptConfig::kWebMIntegrityCheckSize, |
| 207 sizeof(network_iv)); |
| 208 const uint64 iv = base::NetToHost64(network_iv); |
197 buffer->SetDecryptConfig(scoped_ptr<DecryptConfig>(new DecryptConfig( | 209 buffer->SetDecryptConfig(scoped_ptr<DecryptConfig>(new DecryptConfig( |
| 210 data, DecryptConfig::kWebMIntegrityCheckSize, iv, |
198 video_encryption_key_id_.get(), video_encryption_key_id_size_))); | 211 video_encryption_key_id_.get(), video_encryption_key_id_size_))); |
199 } | 212 } |
200 | 213 |
201 buffer->SetTimestamp(timestamp); | 214 buffer->SetTimestamp(timestamp); |
202 | 215 |
203 if (block_duration >= 0) { | 216 if (block_duration >= 0) { |
204 buffer->SetDuration(base::TimeDelta::FromMicroseconds( | 217 buffer->SetDuration(base::TimeDelta::FromMicroseconds( |
205 block_duration * timecode_multiplier_)); | 218 block_duration * timecode_multiplier_)); |
206 } | 219 } |
207 | 220 |
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297 DVLOG(2) << "AddToBufferQueue() : " << track_num_ | 310 DVLOG(2) << "AddToBufferQueue() : " << track_num_ |
298 << " ts " << buffer->GetTimestamp().InSecondsF() | 311 << " ts " << buffer->GetTimestamp().InSecondsF() |
299 << " dur " << buffer->GetDuration().InSecondsF() | 312 << " dur " << buffer->GetDuration().InSecondsF() |
300 << " kf " << buffer->IsKeyframe() | 313 << " kf " << buffer->IsKeyframe() |
301 << " size " << buffer->GetDataSize(); | 314 << " size " << buffer->GetDataSize(); |
302 | 315 |
303 buffers_.push_back(buffer); | 316 buffers_.push_back(buffer); |
304 } | 317 } |
305 | 318 |
306 } // namespace media | 319 } // namespace media |
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