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| 1 /* | |
| 2 * Copyright (c) 2015 The WebRTC project authors. All Rights Reserved. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license | |
| 5 * that can be found in the LICENSE file in the root of the source | |
| 6 * tree. An additional intellectual property rights grant can be found | |
| 7 * in the file PATENTS. All contributing project authors may | |
| 8 * be found in the AUTHORS file in the root of the source tree. | |
| 9 * | |
| 10 */ | |
| 11 | |
| 12 #include "webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_nalu.h" | |
| 13 | |
| 14 #if defined(WEBRTC_VIDEO_TOOLBOX_SUPPORTED) | |
| 15 | |
| 16 #include <CoreFoundation/CoreFoundation.h> | |
| 17 #include <memory> | |
| 18 #include <vector> | |
| 19 | |
| 20 #include "webrtc/base/checks.h" | |
| 21 #include "webrtc/base/logging.h" | |
| 22 #include "webrtc/common_video/h264/h264_common.h" | |
| 23 | |
| 24 namespace webrtc { | |
| 25 | |
| 26 using H264::NaluType; | |
| 27 using H264::kAud; | |
| 28 using H264::kSps; | |
| 29 using H264::ParseNaluType; | |
| 30 | |
| 31 const char kAnnexBHeaderBytes[4] = {0, 0, 0, 1}; | |
| 32 const size_t kAvccHeaderByteSize = sizeof(uint32_t); | |
| 33 | |
| 34 bool H264CMSampleBufferToAnnexBBuffer( | |
| 35 CMSampleBufferRef avcc_sample_buffer, | |
| 36 bool is_keyframe, | |
| 37 rtc::Buffer* annexb_buffer, | |
| 38 webrtc::RTPFragmentationHeader** out_header) { | |
| 39 RTC_DCHECK(avcc_sample_buffer); | |
| 40 RTC_DCHECK(out_header); | |
| 41 *out_header = nullptr; | |
| 42 | |
| 43 // Get format description from the sample buffer. | |
| 44 CMVideoFormatDescriptionRef description = | |
| 45 CMSampleBufferGetFormatDescription(avcc_sample_buffer); | |
| 46 if (description == nullptr) { | |
| 47 LOG(LS_ERROR) << "Failed to get sample buffer's description."; | |
| 48 return false; | |
| 49 } | |
| 50 | |
| 51 // Get parameter set information. | |
| 52 int nalu_header_size = 0; | |
| 53 size_t param_set_count = 0; | |
| 54 OSStatus status = CMVideoFormatDescriptionGetH264ParameterSetAtIndex( | |
| 55 description, 0, nullptr, nullptr, ¶m_set_count, &nalu_header_size); | |
| 56 if (status != noErr) { | |
| 57 LOG(LS_ERROR) << "Failed to get parameter set."; | |
| 58 return false; | |
| 59 } | |
| 60 // TODO(tkchin): handle other potential sizes. | |
| 61 RTC_DCHECK_EQ(nalu_header_size, 4); | |
| 62 RTC_DCHECK_EQ(param_set_count, 2u); | |
| 63 | |
| 64 // Truncate any previous data in the buffer without changing its capacity. | |
| 65 annexb_buffer->SetSize(0); | |
| 66 | |
| 67 size_t nalu_offset = 0; | |
| 68 std::vector<size_t> frag_offsets; | |
| 69 std::vector<size_t> frag_lengths; | |
| 70 | |
| 71 // Place all parameter sets at the front of buffer. | |
| 72 if (is_keyframe) { | |
| 73 size_t param_set_size = 0; | |
| 74 const uint8_t* param_set = nullptr; | |
| 75 for (size_t i = 0; i < param_set_count; ++i) { | |
| 76 status = CMVideoFormatDescriptionGetH264ParameterSetAtIndex( | |
| 77 description, i, ¶m_set, ¶m_set_size, nullptr, nullptr); | |
| 78 if (status != noErr) { | |
| 79 LOG(LS_ERROR) << "Failed to get parameter set."; | |
| 80 return false; | |
| 81 } | |
| 82 // Update buffer. | |
| 83 annexb_buffer->AppendData(kAnnexBHeaderBytes, sizeof(kAnnexBHeaderBytes)); | |
| 84 annexb_buffer->AppendData(reinterpret_cast<const char*>(param_set), | |
| 85 param_set_size); | |
| 86 // Update fragmentation. | |
| 87 frag_offsets.push_back(nalu_offset + sizeof(kAnnexBHeaderBytes)); | |
| 88 frag_lengths.push_back(param_set_size); | |
| 89 nalu_offset += sizeof(kAnnexBHeaderBytes) + param_set_size; | |
| 90 } | |
| 91 } | |
| 92 | |
| 93 // Get block buffer from the sample buffer. | |
| 94 CMBlockBufferRef block_buffer = | |
| 95 CMSampleBufferGetDataBuffer(avcc_sample_buffer); | |
| 96 if (block_buffer == nullptr) { | |
| 97 LOG(LS_ERROR) << "Failed to get sample buffer's block buffer."; | |
| 98 return false; | |
| 99 } | |
| 100 CMBlockBufferRef contiguous_buffer = nullptr; | |
| 101 // Make sure block buffer is contiguous. | |
| 102 if (!CMBlockBufferIsRangeContiguous(block_buffer, 0, 0)) { | |
| 103 status = CMBlockBufferCreateContiguous( | |
| 104 nullptr, block_buffer, nullptr, nullptr, 0, 0, 0, &contiguous_buffer); | |
| 105 if (status != noErr) { | |
| 106 LOG(LS_ERROR) << "Failed to flatten non-contiguous block buffer: " | |
| 107 << status; | |
| 108 return false; | |
| 109 } | |
| 110 } else { | |
| 111 contiguous_buffer = block_buffer; | |
| 112 // Retain to make cleanup easier. | |
| 113 CFRetain(contiguous_buffer); | |
| 114 block_buffer = nullptr; | |
| 115 } | |
| 116 | |
| 117 // Now copy the actual data. | |
| 118 char* data_ptr = nullptr; | |
| 119 size_t block_buffer_size = CMBlockBufferGetDataLength(contiguous_buffer); | |
| 120 status = CMBlockBufferGetDataPointer(contiguous_buffer, 0, nullptr, nullptr, | |
| 121 &data_ptr); | |
| 122 if (status != noErr) { | |
| 123 LOG(LS_ERROR) << "Failed to get block buffer data."; | |
| 124 CFRelease(contiguous_buffer); | |
| 125 return false; | |
| 126 } | |
| 127 size_t bytes_remaining = block_buffer_size; | |
| 128 while (bytes_remaining > 0) { | |
| 129 // The size type here must match |nalu_header_size|, we expect 4 bytes. | |
| 130 // Read the length of the next packet of data. Must convert from big endian | |
| 131 // to host endian. | |
| 132 RTC_DCHECK_GE(bytes_remaining, (size_t)nalu_header_size); | |
| 133 uint32_t* uint32_data_ptr = reinterpret_cast<uint32_t*>(data_ptr); | |
| 134 uint32_t packet_size = CFSwapInt32BigToHost(*uint32_data_ptr); | |
| 135 // Update buffer. | |
| 136 annexb_buffer->AppendData(kAnnexBHeaderBytes, sizeof(kAnnexBHeaderBytes)); | |
| 137 annexb_buffer->AppendData(data_ptr + nalu_header_size, packet_size); | |
| 138 // Update fragmentation. | |
| 139 frag_offsets.push_back(nalu_offset + sizeof(kAnnexBHeaderBytes)); | |
| 140 frag_lengths.push_back(packet_size); | |
| 141 nalu_offset += sizeof(kAnnexBHeaderBytes) + packet_size; | |
| 142 | |
| 143 size_t bytes_written = packet_size + nalu_header_size; | |
| 144 bytes_remaining -= bytes_written; | |
| 145 data_ptr += bytes_written; | |
| 146 } | |
| 147 RTC_DCHECK_EQ(bytes_remaining, (size_t)0); | |
| 148 | |
| 149 std::unique_ptr<webrtc::RTPFragmentationHeader> header; | |
| 150 header.reset(new webrtc::RTPFragmentationHeader()); | |
| 151 header->VerifyAndAllocateFragmentationHeader(frag_offsets.size()); | |
| 152 RTC_DCHECK_EQ(frag_lengths.size(), frag_offsets.size()); | |
| 153 for (size_t i = 0; i < frag_offsets.size(); ++i) { | |
| 154 header->fragmentationOffset[i] = frag_offsets[i]; | |
| 155 header->fragmentationLength[i] = frag_lengths[i]; | |
| 156 header->fragmentationPlType[i] = 0; | |
| 157 header->fragmentationTimeDiff[i] = 0; | |
| 158 } | |
| 159 *out_header = header.release(); | |
| 160 CFRelease(contiguous_buffer); | |
| 161 return true; | |
| 162 } | |
| 163 | |
| 164 bool H264AnnexBBufferToCMSampleBuffer(const uint8_t* annexb_buffer, | |
| 165 size_t annexb_buffer_size, | |
| 166 CMVideoFormatDescriptionRef video_format, | |
| 167 CMSampleBufferRef* out_sample_buffer) { | |
| 168 RTC_DCHECK(annexb_buffer); | |
| 169 RTC_DCHECK(out_sample_buffer); | |
| 170 RTC_DCHECK(video_format); | |
| 171 *out_sample_buffer = nullptr; | |
| 172 | |
| 173 AnnexBBufferReader reader(annexb_buffer, annexb_buffer_size); | |
| 174 if (H264AnnexBBufferHasVideoFormatDescription(annexb_buffer, | |
| 175 annexb_buffer_size)) { | |
| 176 // Advance past the SPS and PPS. | |
| 177 const uint8_t* data = nullptr; | |
| 178 size_t data_len = 0; | |
| 179 if (!reader.ReadNalu(&data, &data_len)) { | |
| 180 LOG(LS_ERROR) << "Failed to read SPS"; | |
| 181 return false; | |
| 182 } | |
| 183 if (!reader.ReadNalu(&data, &data_len)) { | |
| 184 LOG(LS_ERROR) << "Failed to read PPS"; | |
| 185 return false; | |
| 186 } | |
| 187 } | |
| 188 | |
| 189 // Allocate memory as a block buffer. | |
| 190 // TODO(tkchin): figure out how to use a pool. | |
| 191 CMBlockBufferRef block_buffer = nullptr; | |
| 192 OSStatus status = CMBlockBufferCreateWithMemoryBlock( | |
| 193 nullptr, nullptr, reader.BytesRemaining(), nullptr, nullptr, 0, | |
| 194 reader.BytesRemaining(), kCMBlockBufferAssureMemoryNowFlag, | |
| 195 &block_buffer); | |
| 196 if (status != kCMBlockBufferNoErr) { | |
| 197 LOG(LS_ERROR) << "Failed to create block buffer."; | |
| 198 return false; | |
| 199 } | |
| 200 | |
| 201 // Make sure block buffer is contiguous. | |
| 202 CMBlockBufferRef contiguous_buffer = nullptr; | |
| 203 if (!CMBlockBufferIsRangeContiguous(block_buffer, 0, 0)) { | |
| 204 status = CMBlockBufferCreateContiguous( | |
| 205 nullptr, block_buffer, nullptr, nullptr, 0, 0, 0, &contiguous_buffer); | |
| 206 if (status != noErr) { | |
| 207 LOG(LS_ERROR) << "Failed to flatten non-contiguous block buffer: " | |
| 208 << status; | |
| 209 CFRelease(block_buffer); | |
| 210 return false; | |
| 211 } | |
| 212 } else { | |
| 213 contiguous_buffer = block_buffer; | |
| 214 block_buffer = nullptr; | |
| 215 } | |
| 216 | |
| 217 // Get a raw pointer into allocated memory. | |
| 218 size_t block_buffer_size = 0; | |
| 219 char* data_ptr = nullptr; | |
| 220 status = CMBlockBufferGetDataPointer(contiguous_buffer, 0, nullptr, | |
| 221 &block_buffer_size, &data_ptr); | |
| 222 if (status != kCMBlockBufferNoErr) { | |
| 223 LOG(LS_ERROR) << "Failed to get block buffer data pointer."; | |
| 224 CFRelease(contiguous_buffer); | |
| 225 return false; | |
| 226 } | |
| 227 RTC_DCHECK(block_buffer_size == reader.BytesRemaining()); | |
| 228 | |
| 229 // Write Avcc NALUs into block buffer memory. | |
| 230 AvccBufferWriter writer(reinterpret_cast<uint8_t*>(data_ptr), | |
| 231 block_buffer_size); | |
| 232 while (reader.BytesRemaining() > 0) { | |
| 233 const uint8_t* nalu_data_ptr = nullptr; | |
| 234 size_t nalu_data_size = 0; | |
| 235 if (reader.ReadNalu(&nalu_data_ptr, &nalu_data_size)) { | |
| 236 writer.WriteNalu(nalu_data_ptr, nalu_data_size); | |
| 237 } | |
| 238 } | |
| 239 | |
| 240 // Create sample buffer. | |
| 241 status = CMSampleBufferCreate(nullptr, contiguous_buffer, true, nullptr, | |
| 242 nullptr, video_format, 1, 0, nullptr, 0, | |
| 243 nullptr, out_sample_buffer); | |
| 244 if (status != noErr) { | |
| 245 LOG(LS_ERROR) << "Failed to create sample buffer."; | |
| 246 CFRelease(contiguous_buffer); | |
| 247 return false; | |
| 248 } | |
| 249 CFRelease(contiguous_buffer); | |
| 250 return true; | |
| 251 } | |
| 252 | |
| 253 bool H264AnnexBBufferHasVideoFormatDescription(const uint8_t* annexb_buffer, | |
| 254 size_t annexb_buffer_size) { | |
| 255 RTC_DCHECK(annexb_buffer); | |
| 256 RTC_DCHECK_GT(annexb_buffer_size, 4u); | |
| 257 | |
| 258 // The buffer we receive via RTP has 00 00 00 01 start code artifically | |
| 259 // embedded by the RTP depacketizer. Extract NALU information. | |
| 260 // TODO(tkchin): handle potential case where sps and pps are delivered | |
| 261 // separately. | |
| 262 NaluType first_nalu_type = ParseNaluType(annexb_buffer[4]); | |
| 263 bool is_first_nalu_type_sps = first_nalu_type == kSps; | |
| 264 if (is_first_nalu_type_sps) | |
| 265 return true; | |
| 266 bool is_first_nalu_type_aud = first_nalu_type == kAud; | |
| 267 // Start code + access unit delimiter + start code = 4 + 2 + 4 = 10. | |
| 268 if (!is_first_nalu_type_aud || annexb_buffer_size <= 10u) | |
| 269 return false; | |
| 270 NaluType second_nalu_type = ParseNaluType(annexb_buffer[10]); | |
| 271 bool is_second_nalu_type_sps = second_nalu_type == kSps; | |
| 272 return is_second_nalu_type_sps; | |
| 273 } | |
| 274 | |
| 275 CMVideoFormatDescriptionRef CreateVideoFormatDescription( | |
| 276 const uint8_t* annexb_buffer, | |
| 277 size_t annexb_buffer_size) { | |
| 278 if (!H264AnnexBBufferHasVideoFormatDescription(annexb_buffer, | |
| 279 annexb_buffer_size)) { | |
| 280 return nullptr; | |
| 281 } | |
| 282 AnnexBBufferReader reader(annexb_buffer, annexb_buffer_size); | |
| 283 CMVideoFormatDescriptionRef description = nullptr; | |
| 284 OSStatus status = noErr; | |
| 285 // Parse the SPS and PPS into a CMVideoFormatDescription. | |
| 286 const uint8_t* param_set_ptrs[2] = {}; | |
| 287 size_t param_set_sizes[2] = {}; | |
| 288 // Skip AUD. | |
| 289 if (ParseNaluType(annexb_buffer[4]) == kAud) { | |
| 290 if (!reader.ReadNalu(¶m_set_ptrs[0], ¶m_set_sizes[0])) { | |
| 291 LOG(LS_ERROR) << "Failed to read AUD"; | |
| 292 return nullptr; | |
| 293 } | |
| 294 } | |
| 295 if (!reader.ReadNalu(¶m_set_ptrs[0], ¶m_set_sizes[0])) { | |
| 296 LOG(LS_ERROR) << "Failed to read SPS"; | |
| 297 return nullptr; | |
| 298 } | |
| 299 if (!reader.ReadNalu(¶m_set_ptrs[1], ¶m_set_sizes[1])) { | |
| 300 LOG(LS_ERROR) << "Failed to read PPS"; | |
| 301 return nullptr; | |
| 302 } | |
| 303 status = CMVideoFormatDescriptionCreateFromH264ParameterSets( | |
| 304 kCFAllocatorDefault, 2, param_set_ptrs, param_set_sizes, 4, | |
| 305 &description); | |
| 306 if (status != noErr) { | |
| 307 LOG(LS_ERROR) << "Failed to create video format description."; | |
| 308 return nullptr; | |
| 309 } | |
| 310 return description; | |
| 311 } | |
| 312 | |
| 313 AnnexBBufferReader::AnnexBBufferReader(const uint8_t* annexb_buffer, | |
| 314 size_t length) | |
| 315 : start_(annexb_buffer), offset_(0), next_offset_(0), length_(length) { | |
| 316 RTC_DCHECK(annexb_buffer); | |
| 317 offset_ = FindNextNaluHeader(start_, length_, 0); | |
| 318 next_offset_ = | |
| 319 FindNextNaluHeader(start_, length_, offset_ + sizeof(kAnnexBHeaderBytes)); | |
| 320 } | |
| 321 | |
| 322 bool AnnexBBufferReader::ReadNalu(const uint8_t** out_nalu, | |
| 323 size_t* out_length) { | |
| 324 RTC_DCHECK(out_nalu); | |
| 325 RTC_DCHECK(out_length); | |
| 326 *out_nalu = nullptr; | |
| 327 *out_length = 0; | |
| 328 | |
| 329 size_t data_offset = offset_ + sizeof(kAnnexBHeaderBytes); | |
| 330 if (data_offset > length_) { | |
| 331 return false; | |
| 332 } | |
| 333 *out_nalu = start_ + data_offset; | |
| 334 *out_length = next_offset_ - data_offset; | |
| 335 offset_ = next_offset_; | |
| 336 next_offset_ = | |
| 337 FindNextNaluHeader(start_, length_, offset_ + sizeof(kAnnexBHeaderBytes)); | |
| 338 return true; | |
| 339 } | |
| 340 | |
| 341 size_t AnnexBBufferReader::BytesRemaining() const { | |
| 342 return length_ - offset_; | |
| 343 } | |
| 344 | |
| 345 size_t AnnexBBufferReader::FindNextNaluHeader(const uint8_t* start, | |
| 346 size_t length, | |
| 347 size_t offset) const { | |
| 348 RTC_DCHECK(start); | |
| 349 if (offset + sizeof(kAnnexBHeaderBytes) > length) { | |
| 350 return length; | |
| 351 } | |
| 352 // NALUs are separated by an 00 00 00 01 header. Scan the byte stream | |
| 353 // starting from the offset for the next such sequence. | |
| 354 const uint8_t* current = start + offset; | |
| 355 // The loop reads sizeof(kAnnexBHeaderBytes) at a time, so stop when there | |
| 356 // aren't enough bytes remaining. | |
| 357 const uint8_t* const end = start + length - sizeof(kAnnexBHeaderBytes); | |
| 358 while (current < end) { | |
| 359 if (current[3] > 1) { | |
| 360 current += 4; | |
| 361 } else if (current[3] == 1 && current[2] == 0 && current[1] == 0 && | |
| 362 current[0] == 0) { | |
| 363 return current - start; | |
| 364 } else { | |
| 365 ++current; | |
| 366 } | |
| 367 } | |
| 368 return length; | |
| 369 } | |
| 370 | |
| 371 AvccBufferWriter::AvccBufferWriter(uint8_t* const avcc_buffer, size_t length) | |
| 372 : start_(avcc_buffer), offset_(0), length_(length) { | |
| 373 RTC_DCHECK(avcc_buffer); | |
| 374 } | |
| 375 | |
| 376 bool AvccBufferWriter::WriteNalu(const uint8_t* data, size_t data_size) { | |
| 377 // Check if we can write this length of data. | |
| 378 if (data_size + kAvccHeaderByteSize > BytesRemaining()) { | |
| 379 return false; | |
| 380 } | |
| 381 // Write length header, which needs to be big endian. | |
| 382 uint32_t big_endian_length = CFSwapInt32HostToBig(data_size); | |
| 383 memcpy(start_ + offset_, &big_endian_length, sizeof(big_endian_length)); | |
| 384 offset_ += sizeof(big_endian_length); | |
| 385 // Write data. | |
| 386 memcpy(start_ + offset_, data, data_size); | |
| 387 offset_ += data_size; | |
| 388 return true; | |
| 389 } | |
| 390 | |
| 391 size_t AvccBufferWriter::BytesRemaining() const { | |
| 392 return length_ - offset_; | |
| 393 } | |
| 394 | |
| 395 } // namespace webrtc | |
| 396 | |
| 397 #endif // defined(WEBRTC_VIDEO_TOOLBOX_SUPPORTED) | |
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Chromium Code Reviews
Issue 2463313002:
Add a webrtc{en,de}coderfactory implementation for VideoToolbox (Closed)
