Andreas Huber | 85f12e9 | 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 | 5bc087c | 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 | 85f12e9 | 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 | e9810fa | 2012-12-03 15:20:40 -0800 | [diff] [blame] | 25 | #include <media/stagefright/foundation/hexdump.h> |
Andreas Huber | c68a48c | 2010-10-08 12:06:27 -0700 | [diff] [blame] | 26 | #include <media/stagefright/MediaDefs.h> |
| 27 | #include <media/stagefright/MediaErrors.h> |
| 28 | #include <media/stagefright/MetaData.h> |
Andreas Huber | 85f12e9 | 2010-08-19 10:39:47 -0700 | [diff] [blame] | 29 | |
| 30 | namespace android { |
| 31 | |
Andreas Huber | 6a63a93 | 2010-10-01 10:51:41 -0700 | [diff] [blame] | 32 | unsigned parseUE(ABitReader *br) { |
Andreas Huber | 85f12e9 | 2010-08-19 10:39:47 -0700 | [diff] [blame] | 33 | unsigned numZeroes = 0; |
| 34 | while (br->getBits(1) == 0) { |
| 35 | ++numZeroes; |
| 36 | } |
| 37 | |
| 38 | unsigned x = br->getBits(numZeroes); |
| 39 | |
| 40 | return x + (1u << numZeroes) - 1; |
| 41 | } |
| 42 | |
| 43 | // Determine video dimensions from the sequence parameterset. |
| 44 | void FindAVCDimensions( |
Andreas Huber | e9810fa | 2012-12-03 15:20:40 -0800 | [diff] [blame] | 45 | const sp<ABuffer> &seqParamSet, |
| 46 | int32_t *width, int32_t *height, |
| 47 | int32_t *sarWidth, int32_t *sarHeight) { |
Andreas Huber | 85f12e9 | 2010-08-19 10:39:47 -0700 | [diff] [blame] | 48 | ABitReader br(seqParamSet->data() + 1, seqParamSet->size() - 1); |
| 49 | |
| 50 | unsigned profile_idc = br.getBits(8); |
| 51 | br.skipBits(16); |
| 52 | parseUE(&br); // seq_parameter_set_id |
| 53 | |
Andreas Huber | 2d511ff | 2010-10-08 10:38:39 -0700 | [diff] [blame] | 54 | unsigned chroma_format_idc = 1; // 4:2:0 chroma format |
| 55 | |
Andreas Huber | 85f12e9 | 2010-08-19 10:39:47 -0700 | [diff] [blame] | 56 | if (profile_idc == 100 || profile_idc == 110 |
| 57 | || profile_idc == 122 || profile_idc == 244 |
| 58 | || profile_idc == 44 || profile_idc == 83 || profile_idc == 86) { |
Andreas Huber | 2d511ff | 2010-10-08 10:38:39 -0700 | [diff] [blame] | 59 | chroma_format_idc = parseUE(&br); |
Andreas Huber | 85f12e9 | 2010-08-19 10:39:47 -0700 | [diff] [blame] | 60 | if (chroma_format_idc == 3) { |
| 61 | br.skipBits(1); // residual_colour_transform_flag |
| 62 | } |
| 63 | parseUE(&br); // bit_depth_luma_minus8 |
| 64 | parseUE(&br); // bit_depth_chroma_minus8 |
| 65 | br.skipBits(1); // qpprime_y_zero_transform_bypass_flag |
| 66 | CHECK_EQ(br.getBits(1), 0u); // seq_scaling_matrix_present_flag |
| 67 | } |
| 68 | |
| 69 | parseUE(&br); // log2_max_frame_num_minus4 |
| 70 | unsigned pic_order_cnt_type = parseUE(&br); |
| 71 | |
| 72 | if (pic_order_cnt_type == 0) { |
| 73 | parseUE(&br); // log2_max_pic_order_cnt_lsb_minus4 |
| 74 | } else if (pic_order_cnt_type == 1) { |
| 75 | // offset_for_non_ref_pic, offset_for_top_to_bottom_field and |
| 76 | // offset_for_ref_frame are technically se(v), but since we are |
| 77 | // just skipping over them the midpoint does not matter. |
| 78 | |
| 79 | br.getBits(1); // delta_pic_order_always_zero_flag |
| 80 | parseUE(&br); // offset_for_non_ref_pic |
| 81 | parseUE(&br); // offset_for_top_to_bottom_field |
| 82 | |
| 83 | unsigned num_ref_frames_in_pic_order_cnt_cycle = parseUE(&br); |
| 84 | for (unsigned i = 0; i < num_ref_frames_in_pic_order_cnt_cycle; ++i) { |
| 85 | parseUE(&br); // offset_for_ref_frame |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | parseUE(&br); // num_ref_frames |
| 90 | br.getBits(1); // gaps_in_frame_num_value_allowed_flag |
| 91 | |
| 92 | unsigned pic_width_in_mbs_minus1 = parseUE(&br); |
| 93 | unsigned pic_height_in_map_units_minus1 = parseUE(&br); |
| 94 | unsigned frame_mbs_only_flag = br.getBits(1); |
| 95 | |
| 96 | *width = pic_width_in_mbs_minus1 * 16 + 16; |
| 97 | |
| 98 | *height = (2 - frame_mbs_only_flag) |
| 99 | * (pic_height_in_map_units_minus1 * 16 + 16); |
Andreas Huber | 2d511ff | 2010-10-08 10:38:39 -0700 | [diff] [blame] | 100 | |
| 101 | if (!frame_mbs_only_flag) { |
| 102 | br.getBits(1); // mb_adaptive_frame_field_flag |
| 103 | } |
| 104 | |
| 105 | br.getBits(1); // direct_8x8_inference_flag |
| 106 | |
| 107 | if (br.getBits(1)) { // frame_cropping_flag |
| 108 | unsigned frame_crop_left_offset = parseUE(&br); |
| 109 | unsigned frame_crop_right_offset = parseUE(&br); |
| 110 | unsigned frame_crop_top_offset = parseUE(&br); |
| 111 | unsigned frame_crop_bottom_offset = parseUE(&br); |
| 112 | |
| 113 | unsigned cropUnitX, cropUnitY; |
| 114 | if (chroma_format_idc == 0 /* monochrome */) { |
| 115 | cropUnitX = 1; |
| 116 | cropUnitY = 2 - frame_mbs_only_flag; |
| 117 | } else { |
| 118 | unsigned subWidthC = (chroma_format_idc == 3) ? 1 : 2; |
| 119 | unsigned subHeightC = (chroma_format_idc == 1) ? 2 : 1; |
| 120 | |
| 121 | cropUnitX = subWidthC; |
| 122 | cropUnitY = subHeightC * (2 - frame_mbs_only_flag); |
| 123 | } |
| 124 | |
Steve Block | 3856b09 | 2011-10-20 11:56:00 +0100 | [diff] [blame] | 125 | ALOGV("frame_crop = (%u, %u, %u, %u), cropUnitX = %u, cropUnitY = %u", |
Andreas Huber | 2d511ff | 2010-10-08 10:38:39 -0700 | [diff] [blame] | 126 | frame_crop_left_offset, frame_crop_right_offset, |
| 127 | frame_crop_top_offset, frame_crop_bottom_offset, |
| 128 | cropUnitX, cropUnitY); |
| 129 | |
| 130 | *width -= |
| 131 | (frame_crop_left_offset + frame_crop_right_offset) * cropUnitX; |
| 132 | *height -= |
| 133 | (frame_crop_top_offset + frame_crop_bottom_offset) * cropUnitY; |
| 134 | } |
Andreas Huber | e9810fa | 2012-12-03 15:20:40 -0800 | [diff] [blame] | 135 | |
| 136 | if (sarWidth != NULL) { |
| 137 | *sarWidth = 0; |
| 138 | } |
| 139 | |
| 140 | if (sarHeight != NULL) { |
| 141 | *sarHeight = 0; |
| 142 | } |
| 143 | |
| 144 | if (br.getBits(1)) { // vui_parameters_present_flag |
| 145 | unsigned sar_width = 0, sar_height = 0; |
| 146 | |
| 147 | if (br.getBits(1)) { // aspect_ratio_info_present_flag |
| 148 | unsigned aspect_ratio_idc = br.getBits(8); |
| 149 | |
| 150 | if (aspect_ratio_idc == 255 /* extendedSAR */) { |
| 151 | sar_width = br.getBits(16); |
| 152 | sar_height = br.getBits(16); |
| 153 | } else if (aspect_ratio_idc > 0 && aspect_ratio_idc < 14) { |
| 154 | static const int32_t kFixedSARWidth[] = { |
| 155 | 1, 12, 10, 16, 40, 24, 20, 32, 80, 18, 15, 64, 160 |
| 156 | }; |
| 157 | |
| 158 | static const int32_t kFixedSARHeight[] = { |
| 159 | 1, 11, 11, 11, 33, 11, 11, 11, 33, 11, 11, 33, 99 |
| 160 | }; |
| 161 | |
| 162 | sar_width = kFixedSARWidth[aspect_ratio_idc - 1]; |
| 163 | sar_height = kFixedSARHeight[aspect_ratio_idc - 1]; |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | ALOGV("sample aspect ratio = %u : %u", sar_width, sar_height); |
| 168 | |
| 169 | if (sarWidth != NULL) { |
| 170 | *sarWidth = sar_width; |
| 171 | } |
| 172 | |
| 173 | if (sarHeight != NULL) { |
| 174 | *sarHeight = sar_height; |
| 175 | } |
| 176 | } |
Andreas Huber | 85f12e9 | 2010-08-19 10:39:47 -0700 | [diff] [blame] | 177 | } |
| 178 | |
Andreas Huber | c68a48c | 2010-10-08 12:06:27 -0700 | [diff] [blame] | 179 | status_t getNextNALUnit( |
| 180 | const uint8_t **_data, size_t *_size, |
| 181 | const uint8_t **nalStart, size_t *nalSize, |
| 182 | bool startCodeFollows) { |
| 183 | const uint8_t *data = *_data; |
| 184 | size_t size = *_size; |
| 185 | |
| 186 | *nalStart = NULL; |
| 187 | *nalSize = 0; |
| 188 | |
| 189 | if (size == 0) { |
| 190 | return -EAGAIN; |
| 191 | } |
| 192 | |
| 193 | // Skip any number of leading 0x00. |
| 194 | |
| 195 | size_t offset = 0; |
| 196 | while (offset < size && data[offset] == 0x00) { |
| 197 | ++offset; |
| 198 | } |
| 199 | |
| 200 | if (offset == size) { |
| 201 | return -EAGAIN; |
| 202 | } |
| 203 | |
| 204 | // A valid startcode consists of at least two 0x00 bytes followed by 0x01. |
| 205 | |
| 206 | if (offset < 2 || data[offset] != 0x01) { |
| 207 | return ERROR_MALFORMED; |
| 208 | } |
| 209 | |
| 210 | ++offset; |
| 211 | |
| 212 | size_t startOffset = offset; |
| 213 | |
| 214 | for (;;) { |
| 215 | while (offset < size && data[offset] != 0x01) { |
| 216 | ++offset; |
| 217 | } |
| 218 | |
| 219 | if (offset == size) { |
| 220 | if (startCodeFollows) { |
| 221 | offset = size + 2; |
| 222 | break; |
| 223 | } |
| 224 | |
| 225 | return -EAGAIN; |
| 226 | } |
| 227 | |
| 228 | if (data[offset - 1] == 0x00 && data[offset - 2] == 0x00) { |
| 229 | break; |
| 230 | } |
| 231 | |
| 232 | ++offset; |
| 233 | } |
| 234 | |
| 235 | size_t endOffset = offset - 2; |
Andreas Huber | 7f048fd | 2011-08-01 13:22:26 -0700 | [diff] [blame] | 236 | while (endOffset > startOffset + 1 && data[endOffset - 1] == 0x00) { |
Andreas Huber | c68a48c | 2010-10-08 12:06:27 -0700 | [diff] [blame] | 237 | --endOffset; |
| 238 | } |
| 239 | |
| 240 | *nalStart = &data[startOffset]; |
| 241 | *nalSize = endOffset - startOffset; |
| 242 | |
| 243 | if (offset + 2 < size) { |
| 244 | *_data = &data[offset - 2]; |
| 245 | *_size = size - offset + 2; |
| 246 | } else { |
| 247 | *_data = NULL; |
| 248 | *_size = 0; |
| 249 | } |
| 250 | |
| 251 | return OK; |
| 252 | } |
| 253 | |
| 254 | static sp<ABuffer> FindNAL( |
| 255 | const uint8_t *data, size_t size, unsigned nalType, |
| 256 | size_t *stopOffset) { |
| 257 | const uint8_t *nalStart; |
| 258 | size_t nalSize; |
| 259 | while (getNextNALUnit(&data, &size, &nalStart, &nalSize, true) == OK) { |
| 260 | if ((nalStart[0] & 0x1f) == nalType) { |
| 261 | sp<ABuffer> buffer = new ABuffer(nalSize); |
| 262 | memcpy(buffer->data(), nalStart, nalSize); |
| 263 | return buffer; |
| 264 | } |
| 265 | } |
| 266 | |
| 267 | return NULL; |
| 268 | } |
| 269 | |
Andreas Huber | bfd41f3 | 2010-11-15 09:01:13 -0800 | [diff] [blame] | 270 | const char *AVCProfileToString(uint8_t profile) { |
| 271 | switch (profile) { |
| 272 | case kAVCProfileBaseline: |
| 273 | return "Baseline"; |
| 274 | case kAVCProfileMain: |
| 275 | return "Main"; |
| 276 | case kAVCProfileExtended: |
| 277 | return "Extended"; |
| 278 | case kAVCProfileHigh: |
| 279 | return "High"; |
| 280 | case kAVCProfileHigh10: |
| 281 | return "High 10"; |
| 282 | case kAVCProfileHigh422: |
| 283 | return "High 422"; |
| 284 | case kAVCProfileHigh444: |
| 285 | return "High 444"; |
| 286 | case kAVCProfileCAVLC444Intra: |
| 287 | return "CAVLC 444 Intra"; |
| 288 | default: return "Unknown"; |
| 289 | } |
| 290 | } |
| 291 | |
Andreas Huber | c68a48c | 2010-10-08 12:06:27 -0700 | [diff] [blame] | 292 | sp<MetaData> MakeAVCCodecSpecificData(const sp<ABuffer> &accessUnit) { |
| 293 | const uint8_t *data = accessUnit->data(); |
| 294 | size_t size = accessUnit->size(); |
| 295 | |
| 296 | sp<ABuffer> seqParamSet = FindNAL(data, size, 7, NULL); |
| 297 | if (seqParamSet == NULL) { |
| 298 | return NULL; |
| 299 | } |
| 300 | |
| 301 | int32_t width, height; |
Andreas Huber | e9810fa | 2012-12-03 15:20:40 -0800 | [diff] [blame] | 302 | int32_t sarWidth, sarHeight; |
| 303 | FindAVCDimensions( |
| 304 | seqParamSet, &width, &height, &sarWidth, &sarHeight); |
Andreas Huber | c68a48c | 2010-10-08 12:06:27 -0700 | [diff] [blame] | 305 | |
| 306 | size_t stopOffset; |
| 307 | sp<ABuffer> picParamSet = FindNAL(data, size, 8, &stopOffset); |
| 308 | CHECK(picParamSet != NULL); |
| 309 | |
| 310 | size_t csdSize = |
| 311 | 1 + 3 + 1 + 1 |
| 312 | + 2 * 1 + seqParamSet->size() |
| 313 | + 1 + 2 * 1 + picParamSet->size(); |
| 314 | |
| 315 | sp<ABuffer> csd = new ABuffer(csdSize); |
| 316 | uint8_t *out = csd->data(); |
| 317 | |
| 318 | *out++ = 0x01; // configurationVersion |
| 319 | memcpy(out, seqParamSet->data() + 1, 3); // profile/level... |
Andreas Huber | bfd41f3 | 2010-11-15 09:01:13 -0800 | [diff] [blame] | 320 | |
| 321 | uint8_t profile = out[0]; |
| 322 | uint8_t level = out[2]; |
| 323 | |
Andreas Huber | c68a48c | 2010-10-08 12:06:27 -0700 | [diff] [blame] | 324 | out += 3; |
| 325 | *out++ = (0x3f << 2) | 1; // lengthSize == 2 bytes |
| 326 | *out++ = 0xe0 | 1; |
| 327 | |
| 328 | *out++ = seqParamSet->size() >> 8; |
| 329 | *out++ = seqParamSet->size() & 0xff; |
| 330 | memcpy(out, seqParamSet->data(), seqParamSet->size()); |
| 331 | out += seqParamSet->size(); |
| 332 | |
| 333 | *out++ = 1; |
| 334 | |
| 335 | *out++ = picParamSet->size() >> 8; |
| 336 | *out++ = picParamSet->size() & 0xff; |
| 337 | memcpy(out, picParamSet->data(), picParamSet->size()); |
| 338 | |
| 339 | #if 0 |
Steve Block | df64d15 | 2012-01-04 20:05:49 +0000 | [diff] [blame] | 340 | ALOGI("AVC seq param set"); |
Andreas Huber | c68a48c | 2010-10-08 12:06:27 -0700 | [diff] [blame] | 341 | hexdump(seqParamSet->data(), seqParamSet->size()); |
| 342 | #endif |
| 343 | |
| 344 | sp<MetaData> meta = new MetaData; |
| 345 | meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_VIDEO_AVC); |
| 346 | |
Andreas Huber | c639aad | 2011-09-21 13:19:54 -0700 | [diff] [blame] | 347 | meta->setData(kKeyAVCC, kTypeAVCC, csd->data(), csd->size()); |
Andreas Huber | c68a48c | 2010-10-08 12:06:27 -0700 | [diff] [blame] | 348 | meta->setInt32(kKeyWidth, width); |
| 349 | meta->setInt32(kKeyHeight, height); |
| 350 | |
Andreas Huber | e9810fa | 2012-12-03 15:20:40 -0800 | [diff] [blame] | 351 | if (sarWidth > 1 || sarHeight > 1) { |
| 352 | // We treat 0:0 (unspecified) as 1:1. |
| 353 | |
| 354 | meta->setInt32(kKeySARWidth, sarWidth); |
| 355 | meta->setInt32(kKeySARHeight, sarHeight); |
| 356 | |
| 357 | ALOGI("found AVC codec config (%d x %d, %s-profile level %d.%d) " |
| 358 | "SAR %d : %d", |
| 359 | width, |
| 360 | height, |
| 361 | AVCProfileToString(profile), |
| 362 | level / 10, |
| 363 | level % 10, |
| 364 | sarWidth, |
| 365 | sarHeight); |
| 366 | } else { |
| 367 | ALOGI("found AVC codec config (%d x %d, %s-profile level %d.%d)", |
| 368 | width, |
| 369 | height, |
| 370 | AVCProfileToString(profile), |
| 371 | level / 10, |
| 372 | level % 10); |
| 373 | } |
Andreas Huber | c68a48c | 2010-10-08 12:06:27 -0700 | [diff] [blame] | 374 | |
| 375 | return meta; |
| 376 | } |
| 377 | |
| 378 | bool IsIDR(const sp<ABuffer> &buffer) { |
| 379 | const uint8_t *data = buffer->data(); |
| 380 | size_t size = buffer->size(); |
| 381 | |
| 382 | bool foundIDR = false; |
| 383 | |
| 384 | const uint8_t *nalStart; |
| 385 | size_t nalSize; |
| 386 | while (getNextNALUnit(&data, &size, &nalStart, &nalSize, true) == OK) { |
| 387 | CHECK_GT(nalSize, 0u); |
| 388 | |
| 389 | unsigned nalType = nalStart[0] & 0x1f; |
| 390 | |
| 391 | if (nalType == 5) { |
| 392 | foundIDR = true; |
| 393 | break; |
| 394 | } |
| 395 | } |
| 396 | |
| 397 | return foundIDR; |
| 398 | } |
| 399 | |
Andreas Huber | 3fe6215 | 2011-09-16 15:09:22 -0700 | [diff] [blame] | 400 | bool IsAVCReferenceFrame(const sp<ABuffer> &accessUnit) { |
| 401 | const uint8_t *data = accessUnit->data(); |
| 402 | size_t size = accessUnit->size(); |
| 403 | |
| 404 | const uint8_t *nalStart; |
| 405 | size_t nalSize; |
| 406 | while (getNextNALUnit(&data, &size, &nalStart, &nalSize, true) == OK) { |
| 407 | CHECK_GT(nalSize, 0u); |
| 408 | |
| 409 | unsigned nalType = nalStart[0] & 0x1f; |
| 410 | |
| 411 | if (nalType == 5) { |
| 412 | return true; |
| 413 | } else if (nalType == 1) { |
| 414 | unsigned nal_ref_idc = (nalStart[0] >> 5) & 3; |
| 415 | return nal_ref_idc != 0; |
| 416 | } |
| 417 | } |
| 418 | |
| 419 | return true; |
| 420 | } |
| 421 | |
Gloria Wang | 50c44c7 | 2011-02-02 14:12:49 -0800 | [diff] [blame] | 422 | sp<MetaData> MakeAACCodecSpecificData( |
| 423 | unsigned profile, unsigned sampling_freq_index, |
| 424 | unsigned channel_configuration) { |
| 425 | sp<MetaData> meta = new MetaData; |
| 426 | meta->setCString(kKeyMIMEType, MEDIA_MIMETYPE_AUDIO_AAC); |
| 427 | |
| 428 | CHECK_LE(sampling_freq_index, 11u); |
| 429 | static const int32_t kSamplingFreq[] = { |
| 430 | 96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050, |
| 431 | 16000, 12000, 11025, 8000 |
| 432 | }; |
| 433 | meta->setInt32(kKeySampleRate, kSamplingFreq[sampling_freq_index]); |
| 434 | meta->setInt32(kKeyChannelCount, channel_configuration); |
| 435 | |
| 436 | static const uint8_t kStaticESDS[] = { |
| 437 | 0x03, 22, |
| 438 | 0x00, 0x00, // ES_ID |
| 439 | 0x00, // streamDependenceFlag, URL_Flag, OCRstreamFlag |
| 440 | |
| 441 | 0x04, 17, |
| 442 | 0x40, // Audio ISO/IEC 14496-3 |
| 443 | 0x00, 0x00, 0x00, 0x00, |
| 444 | 0x00, 0x00, 0x00, 0x00, |
| 445 | 0x00, 0x00, 0x00, 0x00, |
| 446 | |
| 447 | 0x05, 2, |
| 448 | // AudioSpecificInfo follows |
| 449 | |
| 450 | // oooo offf fccc c000 |
| 451 | // o - audioObjectType |
| 452 | // f - samplingFreqIndex |
| 453 | // c - channelConfig |
| 454 | }; |
| 455 | sp<ABuffer> csd = new ABuffer(sizeof(kStaticESDS) + 2); |
| 456 | memcpy(csd->data(), kStaticESDS, sizeof(kStaticESDS)); |
| 457 | |
| 458 | csd->data()[sizeof(kStaticESDS)] = |
| 459 | ((profile + 1) << 3) | (sampling_freq_index >> 1); |
| 460 | |
| 461 | csd->data()[sizeof(kStaticESDS) + 1] = |
| 462 | ((sampling_freq_index << 7) & 0x80) | (channel_configuration << 3); |
| 463 | |
| 464 | meta->setData(kKeyESDS, 0, csd->data(), csd->size()); |
| 465 | |
| 466 | return meta; |
| 467 | } |
| 468 | |
Andreas Huber | 386d609 | 2011-05-19 08:37:39 -0700 | [diff] [blame] | 469 | bool ExtractDimensionsFromVOLHeader( |
| 470 | const uint8_t *data, size_t size, int32_t *width, int32_t *height) { |
| 471 | ABitReader br(&data[4], size - 4); |
| 472 | br.skipBits(1); // random_accessible_vol |
| 473 | unsigned video_object_type_indication = br.getBits(8); |
| 474 | |
| 475 | CHECK_NE(video_object_type_indication, |
| 476 | 0x21u /* Fine Granularity Scalable */); |
| 477 | |
| 478 | unsigned video_object_layer_verid; |
| 479 | unsigned video_object_layer_priority; |
| 480 | if (br.getBits(1)) { |
| 481 | video_object_layer_verid = br.getBits(4); |
| 482 | video_object_layer_priority = br.getBits(3); |
| 483 | } |
| 484 | unsigned aspect_ratio_info = br.getBits(4); |
| 485 | if (aspect_ratio_info == 0x0f /* extended PAR */) { |
| 486 | br.skipBits(8); // par_width |
| 487 | br.skipBits(8); // par_height |
| 488 | } |
| 489 | if (br.getBits(1)) { // vol_control_parameters |
| 490 | br.skipBits(2); // chroma_format |
| 491 | br.skipBits(1); // low_delay |
| 492 | if (br.getBits(1)) { // vbv_parameters |
| 493 | br.skipBits(15); // first_half_bit_rate |
| 494 | CHECK(br.getBits(1)); // marker_bit |
| 495 | br.skipBits(15); // latter_half_bit_rate |
| 496 | CHECK(br.getBits(1)); // marker_bit |
| 497 | br.skipBits(15); // first_half_vbv_buffer_size |
| 498 | CHECK(br.getBits(1)); // marker_bit |
| 499 | br.skipBits(3); // latter_half_vbv_buffer_size |
| 500 | br.skipBits(11); // first_half_vbv_occupancy |
| 501 | CHECK(br.getBits(1)); // marker_bit |
| 502 | br.skipBits(15); // latter_half_vbv_occupancy |
| 503 | CHECK(br.getBits(1)); // marker_bit |
| 504 | } |
| 505 | } |
| 506 | unsigned video_object_layer_shape = br.getBits(2); |
| 507 | CHECK_EQ(video_object_layer_shape, 0x00u /* rectangular */); |
| 508 | |
| 509 | CHECK(br.getBits(1)); // marker_bit |
| 510 | unsigned vop_time_increment_resolution = br.getBits(16); |
| 511 | CHECK(br.getBits(1)); // marker_bit |
| 512 | |
| 513 | if (br.getBits(1)) { // fixed_vop_rate |
| 514 | // range [0..vop_time_increment_resolution) |
| 515 | |
| 516 | // vop_time_increment_resolution |
| 517 | // 2 => 0..1, 1 bit |
| 518 | // 3 => 0..2, 2 bits |
| 519 | // 4 => 0..3, 2 bits |
| 520 | // 5 => 0..4, 3 bits |
| 521 | // ... |
| 522 | |
| 523 | CHECK_GT(vop_time_increment_resolution, 0u); |
| 524 | --vop_time_increment_resolution; |
| 525 | |
| 526 | unsigned numBits = 0; |
| 527 | while (vop_time_increment_resolution > 0) { |
| 528 | ++numBits; |
| 529 | vop_time_increment_resolution >>= 1; |
| 530 | } |
| 531 | |
| 532 | br.skipBits(numBits); // fixed_vop_time_increment |
| 533 | } |
| 534 | |
| 535 | CHECK(br.getBits(1)); // marker_bit |
| 536 | unsigned video_object_layer_width = br.getBits(13); |
| 537 | CHECK(br.getBits(1)); // marker_bit |
| 538 | unsigned video_object_layer_height = br.getBits(13); |
| 539 | CHECK(br.getBits(1)); // marker_bit |
| 540 | |
| 541 | unsigned interlaced = br.getBits(1); |
| 542 | |
| 543 | *width = video_object_layer_width; |
| 544 | *height = video_object_layer_height; |
| 545 | |
| 546 | return true; |
| 547 | } |
| 548 | |
| 549 | bool GetMPEGAudioFrameSize( |
| 550 | uint32_t header, size_t *frame_size, |
| 551 | int *out_sampling_rate, int *out_channels, |
| 552 | int *out_bitrate, int *out_num_samples) { |
| 553 | *frame_size = 0; |
| 554 | |
| 555 | if (out_sampling_rate) { |
| 556 | *out_sampling_rate = 0; |
| 557 | } |
| 558 | |
| 559 | if (out_channels) { |
| 560 | *out_channels = 0; |
| 561 | } |
| 562 | |
| 563 | if (out_bitrate) { |
| 564 | *out_bitrate = 0; |
| 565 | } |
| 566 | |
| 567 | if (out_num_samples) { |
| 568 | *out_num_samples = 1152; |
| 569 | } |
| 570 | |
| 571 | if ((header & 0xffe00000) != 0xffe00000) { |
| 572 | return false; |
| 573 | } |
| 574 | |
| 575 | unsigned version = (header >> 19) & 3; |
| 576 | |
| 577 | if (version == 0x01) { |
| 578 | return false; |
| 579 | } |
| 580 | |
| 581 | unsigned layer = (header >> 17) & 3; |
| 582 | |
| 583 | if (layer == 0x00) { |
| 584 | return false; |
| 585 | } |
| 586 | |
| 587 | unsigned protection = (header >> 16) & 1; |
| 588 | |
| 589 | unsigned bitrate_index = (header >> 12) & 0x0f; |
| 590 | |
| 591 | if (bitrate_index == 0 || bitrate_index == 0x0f) { |
| 592 | // Disallow "free" bitrate. |
| 593 | return false; |
| 594 | } |
| 595 | |
| 596 | unsigned sampling_rate_index = (header >> 10) & 3; |
| 597 | |
| 598 | if (sampling_rate_index == 3) { |
| 599 | return false; |
| 600 | } |
| 601 | |
| 602 | static const int kSamplingRateV1[] = { 44100, 48000, 32000 }; |
| 603 | int sampling_rate = kSamplingRateV1[sampling_rate_index]; |
| 604 | if (version == 2 /* V2 */) { |
| 605 | sampling_rate /= 2; |
| 606 | } else if (version == 0 /* V2.5 */) { |
| 607 | sampling_rate /= 4; |
| 608 | } |
| 609 | |
| 610 | unsigned padding = (header >> 9) & 1; |
| 611 | |
| 612 | if (layer == 3) { |
| 613 | // layer I |
| 614 | |
| 615 | static const int kBitrateV1[] = { |
| 616 | 32, 64, 96, 128, 160, 192, 224, 256, |
| 617 | 288, 320, 352, 384, 416, 448 |
| 618 | }; |
| 619 | |
| 620 | static const int kBitrateV2[] = { |
| 621 | 32, 48, 56, 64, 80, 96, 112, 128, |
| 622 | 144, 160, 176, 192, 224, 256 |
| 623 | }; |
| 624 | |
| 625 | int bitrate = |
| 626 | (version == 3 /* V1 */) |
| 627 | ? kBitrateV1[bitrate_index - 1] |
| 628 | : kBitrateV2[bitrate_index - 1]; |
| 629 | |
| 630 | if (out_bitrate) { |
| 631 | *out_bitrate = bitrate; |
| 632 | } |
| 633 | |
| 634 | *frame_size = (12000 * bitrate / sampling_rate + padding) * 4; |
| 635 | |
| 636 | if (out_num_samples) { |
| 637 | *out_num_samples = 384; |
| 638 | } |
| 639 | } else { |
| 640 | // layer II or III |
| 641 | |
| 642 | static const int kBitrateV1L2[] = { |
| 643 | 32, 48, 56, 64, 80, 96, 112, 128, |
| 644 | 160, 192, 224, 256, 320, 384 |
| 645 | }; |
| 646 | |
| 647 | static const int kBitrateV1L3[] = { |
| 648 | 32, 40, 48, 56, 64, 80, 96, 112, |
| 649 | 128, 160, 192, 224, 256, 320 |
| 650 | }; |
| 651 | |
| 652 | static const int kBitrateV2[] = { |
| 653 | 8, 16, 24, 32, 40, 48, 56, 64, |
| 654 | 80, 96, 112, 128, 144, 160 |
| 655 | }; |
| 656 | |
| 657 | int bitrate; |
| 658 | if (version == 3 /* V1 */) { |
| 659 | bitrate = (layer == 2 /* L2 */) |
| 660 | ? kBitrateV1L2[bitrate_index - 1] |
| 661 | : kBitrateV1L3[bitrate_index - 1]; |
| 662 | |
| 663 | if (out_num_samples) { |
| 664 | *out_num_samples = 1152; |
| 665 | } |
| 666 | } else { |
| 667 | // V2 (or 2.5) |
| 668 | |
| 669 | bitrate = kBitrateV2[bitrate_index - 1]; |
| 670 | if (out_num_samples) { |
John Grossman | ab736e1 | 2012-08-29 14:51:01 -0700 | [diff] [blame] | 671 | *out_num_samples = (layer == 1 /* L3 */) ? 576 : 1152; |
Andreas Huber | 386d609 | 2011-05-19 08:37:39 -0700 | [diff] [blame] | 672 | } |
| 673 | } |
| 674 | |
| 675 | if (out_bitrate) { |
| 676 | *out_bitrate = bitrate; |
| 677 | } |
| 678 | |
| 679 | if (version == 3 /* V1 */) { |
| 680 | *frame_size = 144000 * bitrate / sampling_rate + padding; |
| 681 | } else { |
| 682 | // V2 or V2.5 |
John Grossman | ab736e1 | 2012-08-29 14:51:01 -0700 | [diff] [blame] | 683 | size_t tmp = (layer == 1 /* L3 */) ? 72000 : 144000; |
| 684 | *frame_size = tmp * bitrate / sampling_rate + padding; |
Andreas Huber | 386d609 | 2011-05-19 08:37:39 -0700 | [diff] [blame] | 685 | } |
| 686 | } |
| 687 | |
| 688 | if (out_sampling_rate) { |
| 689 | *out_sampling_rate = sampling_rate; |
| 690 | } |
| 691 | |
| 692 | if (out_channels) { |
| 693 | int channel_mode = (header >> 6) & 3; |
| 694 | |
| 695 | *out_channels = (channel_mode == 3) ? 1 : 2; |
| 696 | } |
| 697 | |
| 698 | return true; |
| 699 | } |
| 700 | |
Andreas Huber | 85f12e9 | 2010-08-19 10:39:47 -0700 | [diff] [blame] | 701 | } // namespace android |
| 702 | |