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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 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/formats/mpeg/mpeg1_audio_stream_parser.h" | 5 #include "media/formats/mpeg/mpeg1_audio_stream_parser.h" |
| 6 | 6 |
| 7 namespace media { | 7 namespace media { |
| 8 | 8 |
| 9 static const uint32 kMPEG1StartCodeMask = 0xffe00000; | 9 static const uint32 kMPEG1StartCodeMask = 0xffe00000; |
| 10 | 10 |
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| 121 << " layer 0x" << layer | 121 << " layer 0x" << layer |
| 122 << " bitrate_index 0x" << bitrate_index | 122 << " bitrate_index 0x" << bitrate_index |
| 123 << " sample_rate_index 0x" << sample_rate_index | 123 << " sample_rate_index 0x" << sample_rate_index |
| 124 << " channel_mode 0x" << channel_mode; | 124 << " channel_mode 0x" << channel_mode; |
| 125 | 125 |
| 126 if (sync != 0x7ff || | 126 if (sync != 0x7ff || |
| 127 version == kVersionReserved || | 127 version == kVersionReserved || |
| 128 layer == kLayerReserved || | 128 layer == kLayerReserved || |
| 129 bitrate_index == kBitrateFree || bitrate_index == kBitrateBad || | 129 bitrate_index == kBitrateFree || bitrate_index == kBitrateBad || |
| 130 sample_rate_index == kSampleRateReserved) { | 130 sample_rate_index == kSampleRateReserved) { |
| 131 MEDIA_LOG(log_cb) << "Invalid header data :" << std::hex | 131 MEDIA_LOG(ERROR, log_cb) |
| 132 << " sync 0x" << sync | 132 << "Invalid header data :" << std::hex << " sync 0x" << sync |
| 133 << " version 0x" << version | 133 << " version 0x" << version << " layer 0x" << layer |
| 134 << " layer 0x" << layer | 134 << " bitrate_index 0x" << bitrate_index << " sample_rate_index 0x" |
| 135 << " bitrate_index 0x" << bitrate_index | 135 << sample_rate_index << " channel_mode 0x" << channel_mode; |
| 136 << " sample_rate_index 0x" << sample_rate_index | |
| 137 << " channel_mode 0x" << channel_mode; | |
| 138 return false; | 136 return false; |
| 139 } | 137 } |
| 140 | 138 |
| 141 if (layer == kLayer2 && kIsAllowed[bitrate_index][channel_mode]) { | 139 if (layer == kLayer2 && kIsAllowed[bitrate_index][channel_mode]) { |
| 142 MEDIA_LOG(log_cb) << "Invalid (bitrate_index, channel_mode) combination :" | 140 MEDIA_LOG(ERROR, log_cb) << "Invalid (bitrate_index, channel_mode)" |
| 143 << std::hex | 141 << " combination :" << std::hex |
| 144 << " bitrate_index " << bitrate_index | 142 << " bitrate_index " << bitrate_index |
| 145 << " channel_mode " << channel_mode; | 143 << " channel_mode " << channel_mode; |
| 146 return false; | 144 return false; |
| 147 } | 145 } |
| 148 | 146 |
| 149 int bitrate = kBitrateMap[bitrate_index][kVersionLayerMap[version][layer]]; | 147 int bitrate = kBitrateMap[bitrate_index][kVersionLayerMap[version][layer]]; |
| 150 | 148 |
| 151 if (bitrate == 0) { | 149 if (bitrate == 0) { |
| 152 MEDIA_LOG(log_cb) << "Invalid bitrate :" << std::hex | 150 MEDIA_LOG(ERROR, log_cb) << "Invalid bitrate :" << std::hex << " version " |
| 153 << " version " << version | 151 << version << " layer " << layer |
| 154 << " layer " << layer | 152 << " bitrate_index " << bitrate_index; |
| 155 << " bitrate_index " << bitrate_index; | |
| 156 return false; | 153 return false; |
| 157 } | 154 } |
| 158 | 155 |
| 159 DVLOG(2) << " bitrate " << bitrate; | 156 DVLOG(2) << " bitrate " << bitrate; |
| 160 | 157 |
| 161 int frame_sample_rate = kSampleRateMap[sample_rate_index][version]; | 158 int frame_sample_rate = kSampleRateMap[sample_rate_index][version]; |
| 162 if (frame_sample_rate == 0) { | 159 if (frame_sample_rate == 0) { |
| 163 MEDIA_LOG(log_cb) << "Invalid sample rate :" << std::hex | 160 MEDIA_LOG(ERROR, log_cb) << "Invalid sample rate :" << std::hex |
| 164 << " version " << version | 161 << " version " << version << " sample_rate_index " |
| 165 << " sample_rate_index " << sample_rate_index; | 162 << sample_rate_index; |
| 166 return false; | 163 return false; |
| 167 } | 164 } |
| 168 header->sample_rate = frame_sample_rate; | 165 header->sample_rate = frame_sample_rate; |
| 169 | 166 |
| 170 // http://teslabs.com/openplayer/docs/docs/specs/mp3_structure2.pdf | 167 // http://teslabs.com/openplayer/docs/docs/specs/mp3_structure2.pdf |
| 171 // Table 2.1.5 | 168 // Table 2.1.5 |
| 172 int samples_per_frame; | 169 int samples_per_frame; |
| 173 switch (layer) { | 170 switch (layer) { |
| 174 case kLayer1: | 171 case kLayer1: |
| 175 samples_per_frame = 384; | 172 samples_per_frame = 384; |
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| 271 // If we don't have enough data available to check, return 0 so frame parsing | 268 // If we don't have enough data available to check, return 0 so frame parsing |
| 272 // will be retried once more data is available. | 269 // will be retried once more data is available. |
| 273 BitReader reader(data + header_bytes_read, size - header_bytes_read); | 270 BitReader reader(data + header_bytes_read, size - header_bytes_read); |
| 274 if (!reader.SkipBits(xing_header_index * 8) || | 271 if (!reader.SkipBits(xing_header_index * 8) || |
| 275 !reader.ReadBits(sizeof(tag) * 8, &tag)) { | 272 !reader.ReadBits(sizeof(tag) * 8, &tag)) { |
| 276 return 0; | 273 return 0; |
| 277 } | 274 } |
| 278 | 275 |
| 279 // Check to see if the tag contains 'Xing' or 'Info' | 276 // Check to see if the tag contains 'Xing' or 'Info' |
| 280 if (tag == 0x496e666f || tag == 0x58696e67) { | 277 if (tag == 0x496e666f || tag == 0x58696e67) { |
| 281 MEDIA_LOG(log_cb()) << "Skipping XING header."; | 278 MEDIA_LOG(DEBUG, log_cb()) << "Skipping XING header."; |
| 282 if (metadata_frame) | 279 if (metadata_frame) |
| 283 *metadata_frame = true; | 280 *metadata_frame = true; |
| 284 return header_bytes_read + reader.bits_read() / 8; | 281 return header_bytes_read + reader.bits_read() / 8; |
| 285 } | 282 } |
| 286 | 283 |
| 287 // If it wasn't a XING frame, just return the number consumed bytes. | 284 // If it wasn't a XING frame, just return the number consumed bytes. |
| 288 return header_bytes_read; | 285 return header_bytes_read; |
| 289 } | 286 } |
| 290 | 287 |
| 291 } // namespace media | 288 } // namespace media |
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