Andreas Huber | eef3c33 | 2010-08-19 10:39:47 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
Andreas Huber | 54e6649 | 2010-12-23 10:27:40 -0800 | [diff] [blame] | 17 | //#define LOG_NDEBUG 0 |
| 18 | #define LOG_TAG "avc_utils" |
| 19 | #include <utils/Log.h> |
| 20 | |
Andreas Huber | eef3c33 | 2010-08-19 10:39:47 -0700 | [diff] [blame] | 21 | #include "include/avc_utils.h" |
| 22 | |
| 23 | #include <media/stagefright/foundation/ABitReader.h> |
| 24 | #include <media/stagefright/foundation/ADebug.h> |
Andreas Huber | 38285db | 2010-10-08 12:06:27 -0700 | [diff] [blame] | 25 | #include <media/stagefright/MediaDefs.h> |
| 26 | #include <media/stagefright/MediaErrors.h> |
| 27 | #include <media/stagefright/MetaData.h> |
Andreas Huber | eef3c33 | 2010-08-19 10:39:47 -0700 | [diff] [blame] | 28 | |
| 29 | namespace android { |
| 30 | |
Andreas Huber | b72c7e3 | 2010-10-01 10:51:41 -0700 | [diff] [blame] | 31 | unsigned parseUE(ABitReader *br) { |
Andreas Huber | eef3c33 | 2010-08-19 10:39:47 -0700 | [diff] [blame] | 32 | unsigned numZeroes = 0; |
| 33 | while (br->getBits(1) == 0) { |
| 34 | ++numZeroes; |
| 35 | } |
| 36 | |
| 37 | unsigned x = br->getBits(numZeroes); |
| 38 | |
| 39 | return x + (1u << numZeroes) - 1; |
| 40 | } |
| 41 | |
| 42 | // Determine video dimensions from the sequence parameterset. |
| 43 | void FindAVCDimensions( |
| 44 | const sp<ABuffer> &seqParamSet, int32_t *width, int32_t *height) { |
| 45 | ABitReader br(seqParamSet->data() + 1, seqParamSet->size() - 1); |
| 46 | |
| 47 | unsigned profile_idc = br.getBits(8); |
| 48 | br.skipBits(16); |
| 49 | parseUE(&br); // seq_parameter_set_id |
| 50 | |
Andreas Huber | 6934207 | 2010-10-08 10:38:39 -0700 | [diff] [blame] | 51 | unsigned chroma_format_idc = 1; // 4:2:0 chroma format |
| 52 | |
Andreas Huber | eef3c33 | 2010-08-19 10:39:47 -0700 | [diff] [blame] | 53 | if (profile_idc == 100 || profile_idc == 110 |
| 54 | || profile_idc == 122 || profile_idc == 244 |
| 55 | || profile_idc == 44 || profile_idc == 83 || profile_idc == 86) { |
Andreas Huber | 6934207 | 2010-10-08 10:38:39 -0700 | [diff] [blame] | 56 | chroma_format_idc = parseUE(&br); |
Andreas Huber | eef3c33 | 2010-08-19 10:39:47 -0700 | [diff] [blame] | 57 | if (chroma_format_idc == 3) { |
| 58 | br.skipBits(1); // residual_colour_transform_flag |
| 59 | } |
| 60 | parseUE(&br); // bit_depth_luma_minus8 |
| 61 | parseUE(&br); // bit_depth_chroma_minus8 |
| 62 | br.skipBits(1); // qpprime_y_zero_transform_bypass_flag |
| 63 | CHECK_EQ(br.getBits(1), 0u); // seq_scaling_matrix_present_flag |
| 64 | } |
| 65 | |
| 66 | parseUE(&br); // log2_max_frame_num_minus4 |
| 67 | unsigned pic_order_cnt_type = parseUE(&br); |
| 68 | |
| 69 | if (pic_order_cnt_type == 0) { |
| 70 | parseUE(&br); // log2_max_pic_order_cnt_lsb_minus4 |
| 71 | } else if (pic_order_cnt_type == 1) { |
| 72 | // offset_for_non_ref_pic, offset_for_top_to_bottom_field and |
| 73 | // offset_for_ref_frame are technically se(v), but since we are |
| 74 | // just skipping over them the midpoint does not matter. |
| 75 | |
| 76 | br.getBits(1); // delta_pic_order_always_zero_flag |
| 77 | parseUE(&br); // offset_for_non_ref_pic |
| 78 | parseUE(&br); // offset_for_top_to_bottom_field |
| 79 | |
| 80 | unsigned num_ref_frames_in_pic_order_cnt_cycle = parseUE(&br); |
| 81 | for (unsigned i = 0; i < num_ref_frames_in_pic_order_cnt_cycle; ++i) { |
| 82 | parseUE(&br); // offset_for_ref_frame |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | parseUE(&br); // num_ref_frames |
| 87 | br.getBits(1); // gaps_in_frame_num_value_allowed_flag |
| 88 | |
| 89 | unsigned pic_width_in_mbs_minus1 = parseUE(&br); |
| 90 | unsigned pic_height_in_map_units_minus1 = parseUE(&br); |
| 91 | unsigned frame_mbs_only_flag = br.getBits(1); |
| 92 | |
| 93 | *width = pic_width_in_mbs_minus1 * 16 + 16; |
| 94 | |
| 95 | *height = (2 - frame_mbs_only_flag) |
| 96 | * (pic_height_in_map_units_minus1 * 16 + 16); |
Andreas Huber | 6934207 | 2010-10-08 10:38:39 -0700 | [diff] [blame] | 97 | |
| 98 | if (!frame_mbs_only_flag) { |
| 99 | br.getBits(1); // mb_adaptive_frame_field_flag |
| 100 | } |
| 101 | |
| 102 | br.getBits(1); // direct_8x8_inference_flag |
| 103 | |
| 104 | if (br.getBits(1)) { // frame_cropping_flag |
| 105 | unsigned frame_crop_left_offset = parseUE(&br); |
| 106 | unsigned frame_crop_right_offset = parseUE(&br); |
| 107 | unsigned frame_crop_top_offset = parseUE(&br); |
| 108 | unsigned frame_crop_bottom_offset = parseUE(&br); |
| 109 | |
| 110 | unsigned cropUnitX, cropUnitY; |
| 111 | if (chroma_format_idc == 0 /* monochrome */) { |
| 112 | cropUnitX = 1; |
| 113 | cropUnitY = 2 - frame_mbs_only_flag; |
| 114 | } else { |
| 115 | unsigned subWidthC = (chroma_format_idc == 3) ? 1 : 2; |
| 116 | unsigned subHeightC = (chroma_format_idc == 1) ? 2 : 1; |
| 117 | |
| 118 | cropUnitX = subWidthC; |
| 119 | cropUnitY = subHeightC * (2 - frame_mbs_only_flag); |
| 120 | } |
| 121 | |
Steve Block | 71f2cf1 | 2011-10-20 11:56:00 +0100 | [diff] [blame] | 122 | ALOGV("frame_crop = (%u, %u, %u, %u), cropUnitX = %u, cropUnitY = %u", |
Andreas Huber | 6934207 | 2010-10-08 10:38:39 -0700 | [diff] [blame] | 123 | frame_crop_left_offset, frame_crop_right_offset, |
| 124 | frame_crop_top_offset, frame_crop_bottom_offset, |
| 125 | cropUnitX, cropUnitY); |
| 126 | |
| 127 | *width -= |
| 128 | (frame_crop_left_offset + frame_crop_right_offset) * cropUnitX; |
| 129 | *height -= |
| 130 | (frame_crop_top_offset + frame_crop_bottom_offset) * cropUnitY; |
| 131 | } |
Andreas Huber | eef3c33 | 2010-08-19 10:39:47 -0700 | [diff] [blame] | 132 | } |
| 133 | |
Andreas Huber | 38285db | 2010-10-08 12:06:27 -0700 | [diff] [blame] | 134 | status_t getNextNALUnit( |
| 135 | const uint8_t **_data, size_t *_size, |
| 136 | const uint8_t **nalStart, size_t *nalSize, |
| 137 | bool startCodeFollows) { |
| 138 | const uint8_t *data = *_data; |
| 139 | size_t size = *_size; |
| 140 | |
| 141 | *nalStart = NULL; |
| 142 | *nalSize = 0; |
| 143 | |
| 144 | if (size == 0) { |
| 145 | return -EAGAIN; |
| 146 | } |
| 147 | |
| 148 | // Skip any number of leading 0x00. |
| 149 | |
| 150 | size_t offset = 0; |
| 151 | while (offset < size && data[offset] == 0x00) { |
| 152 | ++offset; |
| 153 | } |
| 154 | |
| 155 | if (offset == size) { |
| 156 | return -EAGAIN; |
| 157 | } |
| 158 | |
| 159 | // A valid startcode consists of at least two 0x00 bytes followed by 0x01. |
| 160 | |
| 161 | if (offset < 2 || data[offset] != 0x01) { |
| 162 | return ERROR_MALFORMED; |
| 163 | } |
| 164 | |
| 165 | ++offset; |
| 166 | |
| 167 | size_t startOffset = offset; |
| 168 | |
| 169 | for (;;) { |
| 170 | while (offset < size && data[offset] != 0x01) { |
| 171 | ++offset; |
| 172 | } |
| 173 | |
| 174 | if (offset == size) { |
| 175 | if (startCodeFollows) { |
| 176 | offset = size + 2; |
| 177 | break; |
| 178 | } |
| 179 | |
| 180 | return -EAGAIN; |
| 181 | } |
| 182 | |
| 183 | if (data[offset - 1] == 0x00 && data[offset - 2] == 0x00) { |
| 184 | break; |
| 185 | } |
| 186 | |
| 187 | ++offset; |
| 188 | } |
| 189 | |
| 190 | size_t endOffset = offset - 2; |
Andreas Huber | 05ea63d | 2011-08-01 13:22:26 -0700 | [diff] [blame] | 191 | while (endOffset > startOffset + 1 && data[endOffset - 1] == 0x00) { |
Andreas Huber | 38285db | 2010-10-08 12:06:27 -0700 | [diff] [blame] | 192 | --endOffset; |
| 193 | } |
| 194 | |
| 195 | *nalStart = &data[startOffset]; |
| 196 | *nalSize = endOffset - startOffset; |
| 197 | |
| 198 | if (offset + 2 < size) { |
| 199 | *_data = &data[offset - 2]; |
| 200 | *_size = size - offset + 2; |
| 201 | } else { |
| 202 | *_data = NULL; |
| 203 | *_size = 0; |
| 204 | } |
| 205 | |
| 206 | return OK; |
| 207 | } |
| 208 | |
| 209 | static sp<ABuffer> FindNAL( |
| 210 | const uint8_t *data, size_t size, unsigned nalType, |
| 211 | size_t *stopOffset) { |
| 212 | const uint8_t *nalStart; |
| 213 | size_t nalSize; |
| 214 | while (getNextNALUnit(&data, &size, &nalStart, &nalSize, true) == OK) { |
| 215 | if ((nalStart[0] & 0x1f) == nalType) { |
| 216 | sp<ABuffer> buffer = new ABuffer(nalSize); |
| 217 | memcpy(buffer->data(), nalStart, nalSize); |
| 218 | return buffer; |
| 219 | } |
| 220 | } |
| 221 | |
| 222 | return NULL; |
| 223 | } |
| 224 | |
Andreas Huber | f7e2e31 | 2010-11-15 09:01:13 -0800 | [diff] [blame] | 225 | const char *AVCProfileToString(uint8_t profile) { |
| 226 | switch (profile) { |
| 227 | case kAVCProfileBaseline: |
| 228 | return "Baseline"; |
| 229 | case kAVCProfileMain: |
| 230 | return "Main"; |
| 231 | case kAVCProfileExtended: |
| 232 | return "Extended"; |
| 233 | case kAVCProfileHigh: |
| 234 | return "High"; |
| 235 | case kAVCProfileHigh10: |
| 236 | return "High 10"; |
| 237 | case kAVCProfileHigh422: |
| 238 | return "High 422"; |
| 239 | case kAVCProfileHigh444: |
| 240 | return "High 444"; |
| 241 | case kAVCProfileCAVLC444Intra: |
| 242 | return "CAVLC 444 Intra"; |
| 243 | default: return "Unknown"; |
| 244 | } |
| 245 | } |
| 246 | |
Andreas Huber | 38285db | 2010-10-08 12:06:27 -0700 | [diff] [blame] | 247 | sp<MetaData> MakeAVCCodecSpecificData(const sp<ABuffer> &accessUnit) { |
| 248 | const uint8_t *data = accessUnit->data(); |
| 249 | size_t size = accessUnit->size(); |
| 250 | |
| 251 | sp<ABuffer> seqParamSet = FindNAL(data, size, 7, NULL); |
| 252 | if (seqParamSet == NULL) { |
| 253 | return NULL; |
| 254 | } |
| 255 | |
| 256 | int32_t width, height; |
| 257 | FindAVCDimensions(seqParamSet, &width, &height); |
| 258 | |
| 259 | size_t stopOffset; |
| 260 | sp<ABuffer> picParamSet = FindNAL(data, size, 8, &stopOffset); |
| 261 | CHECK(picParamSet != NULL); |
| 262 | |
| 263 | size_t csdSize = |
| 264 | 1 + 3 + 1 + 1 |
| 265 | + 2 * 1 + seqParamSet->size() |
| 266 | + 1 + 2 * 1 + picParamSet->size(); |
| 267 | |
| 268 | sp<ABuffer> csd = new ABuffer(csdSize); |
| 269 | uint8_t *out = csd->data(); |
| 270 | |
| 271 | *out++ = 0x01; // configurationVersion |
| 272 | memcpy(out, seqParamSet->data() + 1, 3); // profile/level... |
Andreas Huber | f7e2e31 | 2010-11-15 09:01:13 -0800 | [diff] [blame] | 273 | |
| 274 | uint8_t profile = out[0]; |
| 275 | uint8_t level = out[2]; |
| 276 | |
Andreas Huber | 38285db | 2010-10-08 12:06:27 -0700 | [diff] [blame] | 277 | out += 3; |
| 278 | *out++ = (0x3f << 2) | 1; // lengthSize == 2 bytes |
| 279 | *out++ = 0xe0 | 1; |
| 280 | |
| 281 | *out++ = seqParamSet->size() >> 8; |
| 282 | *out++ = seqParamSet->size() & 0xff; |
| 283 | memcpy(out, seqParamSet->data(), seqParamSet->size()); |
| 284 | out += seqParamSet->size(); |
| 285 | |
| 286 | *out++ = 1; |
| 287 | |
| 288 | *out++ = picParamSet->size() >> 8; |
| 289 | *out++ = picParamSet->size() & 0xff; |
| 290 | memcpy(out, picParamSet->data(), picParamSet->size()); |
| 291 | |
| 292 | #if 0 |
Steve Block | 6215d3f | 2012-01-04 20:05:49 +0000 | [diff] [blame] | 293 | ALOGI("AVC seq param set"); |
Andreas Huber | 38285db | 2010-10-08 12:06:27 -0700 | [diff] [blame] | 294 | hexdump(seqParamSet->data(), seqParamSet->size()); |
| 295 | #endif |
| 296 | |
| 297 | sp<MetaData> meta = new MetaData; |
| 298 | meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_VIDEO_AVC); |
| 299 | |
Andreas Huber | 3001e47 | 2011-09-21 13:19:54 -0700 | [diff] [blame] | 300 | meta->setData(kKeyAVCC, kTypeAVCC, csd->data(), csd->size()); |
Andreas Huber | 38285db | 2010-10-08 12:06:27 -0700 | [diff] [blame] | 301 | meta->setInt32(kKeyWidth, width); |
| 302 | meta->setInt32(kKeyHeight, height); |
| 303 | |
Steve Block | 6215d3f | 2012-01-04 20:05:49 +0000 | [diff] [blame] | 304 | ALOGI("found AVC codec config (%d x %d, %s-profile level %d.%d)", |
Andreas Huber | f7e2e31 | 2010-11-15 09:01:13 -0800 | [diff] [blame] | 305 | width, height, AVCProfileToString(profile), level / 10, level % 10); |
Andreas Huber | 38285db | 2010-10-08 12:06:27 -0700 | [diff] [blame] | 306 | |
| 307 | return meta; |
| 308 | } |
| 309 | |
| 310 | bool IsIDR(const sp<ABuffer> &buffer) { |
| 311 | const uint8_t *data = buffer->data(); |
| 312 | size_t size = buffer->size(); |
| 313 | |
| 314 | bool foundIDR = false; |
| 315 | |
| 316 | const uint8_t *nalStart; |
| 317 | size_t nalSize; |
| 318 | while (getNextNALUnit(&data, &size, &nalStart, &nalSize, true) == OK) { |
| 319 | CHECK_GT(nalSize, 0u); |
| 320 | |
| 321 | unsigned nalType = nalStart[0] & 0x1f; |
| 322 | |
| 323 | if (nalType == 5) { |
| 324 | foundIDR = true; |
| 325 | break; |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | return foundIDR; |
| 330 | } |
| 331 | |
Andreas Huber | 950fc9d | 2011-09-16 15:09:22 -0700 | [diff] [blame] | 332 | bool IsAVCReferenceFrame(const sp<ABuffer> &accessUnit) { |
| 333 | const uint8_t *data = accessUnit->data(); |
| 334 | size_t size = accessUnit->size(); |
| 335 | |
| 336 | const uint8_t *nalStart; |
| 337 | size_t nalSize; |
| 338 | while (getNextNALUnit(&data, &size, &nalStart, &nalSize, true) == OK) { |
| 339 | CHECK_GT(nalSize, 0u); |
| 340 | |
| 341 | unsigned nalType = nalStart[0] & 0x1f; |
| 342 | |
| 343 | if (nalType == 5) { |
| 344 | return true; |
| 345 | } else if (nalType == 1) { |
| 346 | unsigned nal_ref_idc = (nalStart[0] >> 5) & 3; |
| 347 | return nal_ref_idc != 0; |
| 348 | } |
| 349 | } |
| 350 | |
| 351 | return true; |
| 352 | } |
| 353 | |
Gloria Wang | c5b0abf | 2011-02-02 14:12:49 -0800 | [diff] [blame] | 354 | sp<MetaData> MakeAACCodecSpecificData( |
| 355 | unsigned profile, unsigned sampling_freq_index, |
| 356 | unsigned channel_configuration) { |
| 357 | sp<MetaData> meta = new MetaData; |
| 358 | meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_AUDIO_AAC); |
| 359 | |
| 360 | CHECK_LE(sampling_freq_index, 11u); |
| 361 | static const int32_t kSamplingFreq[] = { |
| 362 | 96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050, |
| 363 | 16000, 12000, 11025, 8000 |
| 364 | }; |
| 365 | meta->setInt32(kKeySampleRate, kSamplingFreq[sampling_freq_index]); |
| 366 | meta->setInt32(kKeyChannelCount, channel_configuration); |
| 367 | |
| 368 | static const uint8_t kStaticESDS[] = { |
| 369 | 0x03, 22, |
| 370 | 0x00, 0x00, // ES_ID |
| 371 | 0x00, // streamDependenceFlag, URL_Flag, OCRstreamFlag |
| 372 | |
| 373 | 0x04, 17, |
| 374 | 0x40, // Audio ISO/IEC 14496-3 |
| 375 | 0x00, 0x00, 0x00, 0x00, |
| 376 | 0x00, 0x00, 0x00, 0x00, |
| 377 | 0x00, 0x00, 0x00, 0x00, |
| 378 | |
| 379 | 0x05, 2, |
| 380 | // AudioSpecificInfo follows |
| 381 | |
| 382 | // oooo offf fccc c000 |
| 383 | // o - audioObjectType |
| 384 | // f - samplingFreqIndex |
| 385 | // c - channelConfig |
| 386 | }; |
| 387 | sp<ABuffer> csd = new ABuffer(sizeof(kStaticESDS) + 2); |
| 388 | memcpy(csd->data(), kStaticESDS, sizeof(kStaticESDS)); |
| 389 | |
| 390 | csd->data()[sizeof(kStaticESDS)] = |
| 391 | ((profile + 1) << 3) | (sampling_freq_index >> 1); |
| 392 | |
| 393 | csd->data()[sizeof(kStaticESDS) + 1] = |
| 394 | ((sampling_freq_index << 7) & 0x80) | (channel_configuration << 3); |
| 395 | |
| 396 | meta->setData(kKeyESDS, 0, csd->data(), csd->size()); |
| 397 | |
| 398 | return meta; |
| 399 | } |
| 400 | |
Andreas Huber | eb2f9c1 | 2011-05-19 08:37:39 -0700 | [diff] [blame] | 401 | bool ExtractDimensionsFromVOLHeader( |
| 402 | const uint8_t *data, size_t size, int32_t *width, int32_t *height) { |
| 403 | ABitReader br(&data[4], size - 4); |
| 404 | br.skipBits(1); // random_accessible_vol |
| 405 | unsigned video_object_type_indication = br.getBits(8); |
| 406 | |
| 407 | CHECK_NE(video_object_type_indication, |
| 408 | 0x21u /* Fine Granularity Scalable */); |
| 409 | |
| 410 | unsigned video_object_layer_verid; |
| 411 | unsigned video_object_layer_priority; |
| 412 | if (br.getBits(1)) { |
| 413 | video_object_layer_verid = br.getBits(4); |
| 414 | video_object_layer_priority = br.getBits(3); |
| 415 | } |
| 416 | unsigned aspect_ratio_info = br.getBits(4); |
| 417 | if (aspect_ratio_info == 0x0f /* extended PAR */) { |
| 418 | br.skipBits(8); // par_width |
| 419 | br.skipBits(8); // par_height |
| 420 | } |
| 421 | if (br.getBits(1)) { // vol_control_parameters |
| 422 | br.skipBits(2); // chroma_format |
| 423 | br.skipBits(1); // low_delay |
| 424 | if (br.getBits(1)) { // vbv_parameters |
| 425 | br.skipBits(15); // first_half_bit_rate |
| 426 | CHECK(br.getBits(1)); // marker_bit |
| 427 | br.skipBits(15); // latter_half_bit_rate |
| 428 | CHECK(br.getBits(1)); // marker_bit |
| 429 | br.skipBits(15); // first_half_vbv_buffer_size |
| 430 | CHECK(br.getBits(1)); // marker_bit |
| 431 | br.skipBits(3); // latter_half_vbv_buffer_size |
| 432 | br.skipBits(11); // first_half_vbv_occupancy |
| 433 | CHECK(br.getBits(1)); // marker_bit |
| 434 | br.skipBits(15); // latter_half_vbv_occupancy |
| 435 | CHECK(br.getBits(1)); // marker_bit |
| 436 | } |
| 437 | } |
| 438 | unsigned video_object_layer_shape = br.getBits(2); |
| 439 | CHECK_EQ(video_object_layer_shape, 0x00u /* rectangular */); |
| 440 | |
| 441 | CHECK(br.getBits(1)); // marker_bit |
| 442 | unsigned vop_time_increment_resolution = br.getBits(16); |
| 443 | CHECK(br.getBits(1)); // marker_bit |
| 444 | |
| 445 | if (br.getBits(1)) { // fixed_vop_rate |
| 446 | // range [0..vop_time_increment_resolution) |
| 447 | |
| 448 | // vop_time_increment_resolution |
| 449 | // 2 => 0..1, 1 bit |
| 450 | // 3 => 0..2, 2 bits |
| 451 | // 4 => 0..3, 2 bits |
| 452 | // 5 => 0..4, 3 bits |
| 453 | // ... |
| 454 | |
| 455 | CHECK_GT(vop_time_increment_resolution, 0u); |
| 456 | --vop_time_increment_resolution; |
| 457 | |
| 458 | unsigned numBits = 0; |
| 459 | while (vop_time_increment_resolution > 0) { |
| 460 | ++numBits; |
| 461 | vop_time_increment_resolution >>= 1; |
| 462 | } |
| 463 | |
| 464 | br.skipBits(numBits); // fixed_vop_time_increment |
| 465 | } |
| 466 | |
| 467 | CHECK(br.getBits(1)); // marker_bit |
| 468 | unsigned video_object_layer_width = br.getBits(13); |
| 469 | CHECK(br.getBits(1)); // marker_bit |
| 470 | unsigned video_object_layer_height = br.getBits(13); |
| 471 | CHECK(br.getBits(1)); // marker_bit |
| 472 | |
| 473 | unsigned interlaced = br.getBits(1); |
| 474 | |
| 475 | *width = video_object_layer_width; |
| 476 | *height = video_object_layer_height; |
| 477 | |
| 478 | return true; |
| 479 | } |
| 480 | |
| 481 | bool GetMPEGAudioFrameSize( |
| 482 | uint32_t header, size_t *frame_size, |
| 483 | int *out_sampling_rate, int *out_channels, |
| 484 | int *out_bitrate, int *out_num_samples) { |
| 485 | *frame_size = 0; |
| 486 | |
| 487 | if (out_sampling_rate) { |
| 488 | *out_sampling_rate = 0; |
| 489 | } |
| 490 | |
| 491 | if (out_channels) { |
| 492 | *out_channels = 0; |
| 493 | } |
| 494 | |
| 495 | if (out_bitrate) { |
| 496 | *out_bitrate = 0; |
| 497 | } |
| 498 | |
| 499 | if (out_num_samples) { |
| 500 | *out_num_samples = 1152; |
| 501 | } |
| 502 | |
| 503 | if ((header & 0xffe00000) != 0xffe00000) { |
| 504 | return false; |
| 505 | } |
| 506 | |
| 507 | unsigned version = (header >> 19) & 3; |
| 508 | |
| 509 | if (version == 0x01) { |
| 510 | return false; |
| 511 | } |
| 512 | |
| 513 | unsigned layer = (header >> 17) & 3; |
| 514 | |
| 515 | if (layer == 0x00) { |
| 516 | return false; |
| 517 | } |
| 518 | |
| 519 | unsigned protection = (header >> 16) & 1; |
| 520 | |
| 521 | unsigned bitrate_index = (header >> 12) & 0x0f; |
| 522 | |
| 523 | if (bitrate_index == 0 || bitrate_index == 0x0f) { |
| 524 | // Disallow "free" bitrate. |
| 525 | return false; |
| 526 | } |
| 527 | |
| 528 | unsigned sampling_rate_index = (header >> 10) & 3; |
| 529 | |
| 530 | if (sampling_rate_index == 3) { |
| 531 | return false; |
| 532 | } |
| 533 | |
| 534 | static const int kSamplingRateV1[] = { 44100, 48000, 32000 }; |
| 535 | int sampling_rate = kSamplingRateV1[sampling_rate_index]; |
| 536 | if (version == 2 /* V2 */) { |
| 537 | sampling_rate /= 2; |
| 538 | } else if (version == 0 /* V2.5 */) { |
| 539 | sampling_rate /= 4; |
| 540 | } |
| 541 | |
| 542 | unsigned padding = (header >> 9) & 1; |
| 543 | |
| 544 | if (layer == 3) { |
| 545 | // layer I |
| 546 | |
| 547 | static const int kBitrateV1[] = { |
| 548 | 32, 64, 96, 128, 160, 192, 224, 256, |
| 549 | 288, 320, 352, 384, 416, 448 |
| 550 | }; |
| 551 | |
| 552 | static const int kBitrateV2[] = { |
| 553 | 32, 48, 56, 64, 80, 96, 112, 128, |
| 554 | 144, 160, 176, 192, 224, 256 |
| 555 | }; |
| 556 | |
| 557 | int bitrate = |
| 558 | (version == 3 /* V1 */) |
| 559 | ? kBitrateV1[bitrate_index - 1] |
| 560 | : kBitrateV2[bitrate_index - 1]; |
| 561 | |
| 562 | if (out_bitrate) { |
| 563 | *out_bitrate = bitrate; |
| 564 | } |
| 565 | |
| 566 | *frame_size = (12000 * bitrate / sampling_rate + padding) * 4; |
| 567 | |
| 568 | if (out_num_samples) { |
| 569 | *out_num_samples = 384; |
| 570 | } |
| 571 | } else { |
| 572 | // layer II or III |
| 573 | |
| 574 | static const int kBitrateV1L2[] = { |
| 575 | 32, 48, 56, 64, 80, 96, 112, 128, |
| 576 | 160, 192, 224, 256, 320, 384 |
| 577 | }; |
| 578 | |
| 579 | static const int kBitrateV1L3[] = { |
| 580 | 32, 40, 48, 56, 64, 80, 96, 112, |
| 581 | 128, 160, 192, 224, 256, 320 |
| 582 | }; |
| 583 | |
| 584 | static const int kBitrateV2[] = { |
| 585 | 8, 16, 24, 32, 40, 48, 56, 64, |
| 586 | 80, 96, 112, 128, 144, 160 |
| 587 | }; |
| 588 | |
| 589 | int bitrate; |
| 590 | if (version == 3 /* V1 */) { |
| 591 | bitrate = (layer == 2 /* L2 */) |
| 592 | ? kBitrateV1L2[bitrate_index - 1] |
| 593 | : kBitrateV1L3[bitrate_index - 1]; |
| 594 | |
| 595 | if (out_num_samples) { |
| 596 | *out_num_samples = 1152; |
| 597 | } |
| 598 | } else { |
| 599 | // V2 (or 2.5) |
| 600 | |
| 601 | bitrate = kBitrateV2[bitrate_index - 1]; |
| 602 | if (out_num_samples) { |
| 603 | *out_num_samples = 576; |
| 604 | } |
| 605 | } |
| 606 | |
| 607 | if (out_bitrate) { |
| 608 | *out_bitrate = bitrate; |
| 609 | } |
| 610 | |
| 611 | if (version == 3 /* V1 */) { |
| 612 | *frame_size = 144000 * bitrate / sampling_rate + padding; |
| 613 | } else { |
| 614 | // V2 or V2.5 |
| 615 | *frame_size = 72000 * bitrate / sampling_rate + padding; |
| 616 | } |
| 617 | } |
| 618 | |
| 619 | if (out_sampling_rate) { |
| 620 | *out_sampling_rate = sampling_rate; |
| 621 | } |
| 622 | |
| 623 | if (out_channels) { |
| 624 | int channel_mode = (header >> 6) & 3; |
| 625 | |
| 626 | *out_channels = (channel_mode == 3) ? 1 : 2; |
| 627 | } |
| 628 | |
| 629 | return true; |
| 630 | } |
| 631 | |
Andreas Huber | eef3c33 | 2010-08-19 10:39:47 -0700 | [diff] [blame] | 632 | } // namespace android |
| 633 | |