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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 | |
| 23 namespace webrtc { | |
| 24 | |
| 25 using H264::kAud; | |
| 26 using H264::kSps; | |
| 27 using H264::NaluIndex; | |
| 28 using H264::NaluType; | |
| 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 RTC_CHECK_EQ(nalu_header_size, kAvccHeaderByteSize); | |
| 61 RTC_DCHECK_EQ(param_set_count, 2u); | |
| 62 | |
| 63 // Truncate any previous data in the buffer without changing its capacity. | |
| 64 annexb_buffer->SetSize(0); | |
| 65 | |
| 66 size_t nalu_offset = 0; | |
| 67 std::vector<size_t> frag_offsets; | |
| 68 std::vector<size_t> frag_lengths; | |
| 69 | |
| 70 // Place all parameter sets at the front of buffer. | |
| 71 if (is_keyframe) { | |
| 72 size_t param_set_size = 0; | |
| 73 const uint8_t* param_set = nullptr; | |
| 74 for (size_t i = 0; i < param_set_count; ++i) { | |
| 75 status = CMVideoFormatDescriptionGetH264ParameterSetAtIndex( | |
| 76 description, i, ¶m_set, ¶m_set_size, nullptr, nullptr); | |
| 77 if (status != noErr) { | |
| 78 LOG(LS_ERROR) << "Failed to get parameter set."; | |
| 79 return false; | |
| 80 } | |
| 81 // Update buffer. | |
| 82 annexb_buffer->AppendData(kAnnexBHeaderBytes, sizeof(kAnnexBHeaderBytes)); | |
| 83 annexb_buffer->AppendData(reinterpret_cast<const char*>(param_set), | |
| 84 param_set_size); | |
| 85 // Update fragmentation. | |
| 86 frag_offsets.push_back(nalu_offset + sizeof(kAnnexBHeaderBytes)); | |
| 87 frag_lengths.push_back(param_set_size); | |
| 88 nalu_offset += sizeof(kAnnexBHeaderBytes) + param_set_size; | |
| 89 } | |
| 90 } | |
| 91 | |
| 92 // Get block buffer from the sample buffer. | |
| 93 CMBlockBufferRef block_buffer = | |
| 94 CMSampleBufferGetDataBuffer(avcc_sample_buffer); | |
| 95 if (block_buffer == nullptr) { | |
| 96 LOG(LS_ERROR) << "Failed to get sample buffer's block buffer."; | |
| 97 return false; | |
| 98 } | |
| 99 CMBlockBufferRef contiguous_buffer = nullptr; | |
| 100 // Make sure block buffer is contiguous. | |
| 101 if (!CMBlockBufferIsRangeContiguous(block_buffer, 0, 0)) { | |
| 102 status = CMBlockBufferCreateContiguous( | |
| 103 nullptr, block_buffer, nullptr, nullptr, 0, 0, 0, &contiguous_buffer); | |
| 104 if (status != noErr) { | |
| 105 LOG(LS_ERROR) << "Failed to flatten non-contiguous block buffer: " | |
| 106 << status; | |
| 107 return false; | |
| 108 } | |
| 109 } else { | |
| 110 contiguous_buffer = block_buffer; | |
| 111 // Retain to make cleanup easier. | |
| 112 CFRetain(contiguous_buffer); | |
| 113 block_buffer = nullptr; | |
| 114 } | |
| 115 | |
| 116 // Now copy the actual data. | |
| 117 char* data_ptr = nullptr; | |
| 118 size_t block_buffer_size = CMBlockBufferGetDataLength(contiguous_buffer); | |
| 119 status = CMBlockBufferGetDataPointer(contiguous_buffer, 0, nullptr, nullptr, | |
| 120 &data_ptr); | |
| 121 if (status != noErr) { | |
| 122 LOG(LS_ERROR) << "Failed to get block buffer data."; | |
| 123 CFRelease(contiguous_buffer); | |
| 124 return false; | |
| 125 } | |
| 126 size_t bytes_remaining = block_buffer_size; | |
| 127 while (bytes_remaining > 0) { | |
| 128 // The size type here must match |nalu_header_size|, we expect 4 bytes. | |
| 129 // Read the length of the next packet of data. Must convert from big endian | |
| 130 // to host endian. | |
| 131 RTC_DCHECK_GE(bytes_remaining, (size_t)nalu_header_size); | |
| 132 uint32_t* uint32_data_ptr = reinterpret_cast<uint32_t*>(data_ptr); | |
| 133 uint32_t packet_size = CFSwapInt32BigToHost(*uint32_data_ptr); | |
| 134 // Update buffer. | |
| 135 annexb_buffer->AppendData(kAnnexBHeaderBytes, sizeof(kAnnexBHeaderBytes)); | |
| 136 annexb_buffer->AppendData(data_ptr + nalu_header_size, packet_size); | |
| 137 // Update fragmentation. | |
| 138 frag_offsets.push_back(nalu_offset + sizeof(kAnnexBHeaderBytes)); | |
| 139 frag_lengths.push_back(packet_size); | |
| 140 nalu_offset += sizeof(kAnnexBHeaderBytes) + packet_size; | |
| 141 | |
| 142 size_t bytes_written = packet_size + sizeof(kAnnexBHeaderBytes); | |
| 143 bytes_remaining -= bytes_written; | |
| 144 data_ptr += bytes_written; | |
| 145 } | |
| 146 RTC_DCHECK_EQ(bytes_remaining, (size_t)0); | |
| 147 | |
| 148 std::unique_ptr<webrtc::RTPFragmentationHeader> header; | |
| 149 header.reset(new webrtc::RTPFragmentationHeader()); | |
| 150 header->VerifyAndAllocateFragmentationHeader(frag_offsets.size()); | |
| 151 RTC_DCHECK_EQ(frag_lengths.size(), frag_offsets.size()); | |
| 152 for (size_t i = 0; i < frag_offsets.size(); ++i) { | |
| 153 header->fragmentationOffset[i] = frag_offsets[i]; | |
| 154 header->fragmentationLength[i] = frag_lengths[i]; | |
| 155 header->fragmentationPlType[i] = 0; | |
| 156 header->fragmentationTimeDiff[i] = 0; | |
| 157 } | |
| 158 *out_header = header.release(); | |
| 159 CFRelease(contiguous_buffer); | |
| 160 return true; | |
| 161 } | |
| 162 | |
| 163 bool H264AnnexBBufferToCMSampleBuffer(const uint8_t* annexb_buffer, | |
| 164 size_t annexb_buffer_size, | |
| 165 CMVideoFormatDescriptionRef video_format, | |
| 166 CMSampleBufferRef* out_sample_buffer) { | |
| 167 RTC_DCHECK(annexb_buffer); | |
| 168 RTC_DCHECK(out_sample_buffer); | |
| 169 RTC_DCHECK(video_format); | |
| 170 *out_sample_buffer = nullptr; | |
| 171 | |
| 172 AnnexBBufferReader reader(annexb_buffer, annexb_buffer_size); | |
| 173 if (H264AnnexBBufferHasVideoFormatDescription(annexb_buffer, | |
| 174 annexb_buffer_size)) { | |
| 175 // Advance past the SPS and PPS. | |
| 176 const uint8_t* data = nullptr; | |
| 177 size_t data_len = 0; | |
| 178 if (!reader.ReadNalu(&data, &data_len)) { | |
| 179 LOG(LS_ERROR) << "Failed to read SPS"; | |
| 180 return false; | |
| 181 } | |
| 182 if (!reader.ReadNalu(&data, &data_len)) { | |
| 183 LOG(LS_ERROR) << "Failed to read PPS"; | |
| 184 return false; | |
| 185 } | |
| 186 } | |
| 187 | |
| 188 // Allocate memory as a block buffer. | |
| 189 // TODO(tkchin): figure out how to use a pool. | |
| 190 CMBlockBufferRef block_buffer = nullptr; | |
| 191 OSStatus status = CMBlockBufferCreateWithMemoryBlock( | |
| 192 nullptr, nullptr, reader.BytesRemaining(), nullptr, nullptr, 0, | |
| 193 reader.BytesRemaining(), kCMBlockBufferAssureMemoryNowFlag, | |
| 194 &block_buffer); | |
| 195 if (status != kCMBlockBufferNoErr) { | |
| 196 LOG(LS_ERROR) << "Failed to create block buffer."; | |
| 197 return false; | |
| 198 } | |
| 199 | |
| 200 // Make sure block buffer is contiguous. | |
| 201 CMBlockBufferRef contiguous_buffer = nullptr; | |
| 202 if (!CMBlockBufferIsRangeContiguous(block_buffer, 0, 0)) { | |
| 203 status = CMBlockBufferCreateContiguous( | |
| 204 nullptr, block_buffer, nullptr, nullptr, 0, 0, 0, &contiguous_buffer); | |
| 205 if (status != noErr) { | |
| 206 LOG(LS_ERROR) << "Failed to flatten non-contiguous block buffer: " | |
| 207 << status; | |
| 208 CFRelease(block_buffer); | |
| 209 return false; | |
| 210 } | |
| 211 } else { | |
| 212 contiguous_buffer = block_buffer; | |
| 213 block_buffer = nullptr; | |
| 214 } | |
| 215 | |
| 216 // Get a raw pointer into allocated memory. | |
| 217 size_t block_buffer_size = 0; | |
| 218 char* data_ptr = nullptr; | |
| 219 status = CMBlockBufferGetDataPointer(contiguous_buffer, 0, nullptr, | |
| 220 &block_buffer_size, &data_ptr); | |
| 221 if (status != kCMBlockBufferNoErr) { | |
| 222 LOG(LS_ERROR) << "Failed to get block buffer data pointer."; | |
| 223 CFRelease(contiguous_buffer); | |
| 224 return false; | |
| 225 } | |
| 226 RTC_DCHECK(block_buffer_size == reader.BytesRemaining()); | |
| 227 | |
| 228 // Write Avcc NALUs into block buffer memory. | |
| 229 AvccBufferWriter writer(reinterpret_cast<uint8_t*>(data_ptr), | |
| 230 block_buffer_size); | |
| 231 while (reader.BytesRemaining() > 0) { | |
| 232 const uint8_t* nalu_data_ptr = nullptr; | |
| 233 size_t nalu_data_size = 0; | |
| 234 if (reader.ReadNalu(&nalu_data_ptr, &nalu_data_size)) { | |
| 235 writer.WriteNalu(nalu_data_ptr, nalu_data_size); | |
| 236 } | |
| 237 } | |
| 238 | |
| 239 // Create sample buffer. | |
| 240 status = CMSampleBufferCreate(nullptr, contiguous_buffer, true, nullptr, | |
| 241 nullptr, video_format, 1, 0, nullptr, 0, | |
| 242 nullptr, out_sample_buffer); | |
| 243 if (status != noErr) { | |
| 244 LOG(LS_ERROR) << "Failed to create sample buffer."; | |
| 245 CFRelease(contiguous_buffer); | |
| 246 return false; | |
| 247 } | |
| 248 CFRelease(contiguous_buffer); | |
| 249 return true; | |
| 250 } | |
| 251 | |
| 252 bool H264AnnexBBufferHasVideoFormatDescription(const uint8_t* annexb_buffer, | |
| 253 size_t annexb_buffer_size) { | |
| 254 RTC_DCHECK(annexb_buffer); | |
| 255 RTC_DCHECK_GT(annexb_buffer_size, 4u); | |
| 256 | |
| 257 // The buffer we receive via RTP has 00 00 00 01 start code artifically | |
| 258 // embedded by the RTP depacketizer. Extract NALU information. | |
| 259 // TODO(tkchin): handle potential case where sps and pps are delivered | |
| 260 // separately. | |
| 261 NaluType first_nalu_type = ParseNaluType(annexb_buffer[4]); | |
| 262 bool is_first_nalu_type_sps = first_nalu_type == kSps; | |
| 263 if (is_first_nalu_type_sps) | |
| 264 return true; | |
| 265 bool is_first_nalu_type_aud = first_nalu_type == kAud; | |
| 266 // Start code + access unit delimiter + start code = 4 + 2 + 4 = 10. | |
| 267 if (!is_first_nalu_type_aud || annexb_buffer_size <= 10u) | |
| 268 return false; | |
| 269 NaluType second_nalu_type = ParseNaluType(annexb_buffer[10]); | |
| 270 bool is_second_nalu_type_sps = second_nalu_type == kSps; | |
| 271 return is_second_nalu_type_sps; | |
| 272 } | |
| 273 | |
| 274 CMVideoFormatDescriptionRef CreateVideoFormatDescription( | |
| 275 const uint8_t* annexb_buffer, | |
| 276 size_t annexb_buffer_size) { | |
| 277 if (!H264AnnexBBufferHasVideoFormatDescription(annexb_buffer, | |
| 278 annexb_buffer_size)) { | |
| 279 return nullptr; | |
| 280 } | |
| 281 AnnexBBufferReader reader(annexb_buffer, annexb_buffer_size); | |
| 282 CMVideoFormatDescriptionRef description = nullptr; | |
| 283 OSStatus status = noErr; | |
| 284 // Parse the SPS and PPS into a CMVideoFormatDescription. | |
| 285 const uint8_t* param_set_ptrs[2] = {}; | |
| 286 size_t param_set_sizes[2] = {}; | |
| 287 // Skip AUD. | |
| 288 if (ParseNaluType(annexb_buffer[4]) == kAud) { | |
| 289 if (!reader.ReadNalu(¶m_set_ptrs[0], ¶m_set_sizes[0])) { | |
| 290 LOG(LS_ERROR) << "Failed to read AUD"; | |
| 291 return nullptr; | |
| 292 } | |
| 293 } | |
| 294 if (!reader.ReadNalu(¶m_set_ptrs[0], ¶m_set_sizes[0])) { | |
| 295 LOG(LS_ERROR) << "Failed to read SPS"; | |
| 296 return nullptr; | |
| 297 } | |
| 298 if (!reader.ReadNalu(¶m_set_ptrs[1], ¶m_set_sizes[1])) { | |
| 299 LOG(LS_ERROR) << "Failed to read PPS"; | |
| 300 return nullptr; | |
| 301 } | |
| 302 status = CMVideoFormatDescriptionCreateFromH264ParameterSets( | |
| 303 kCFAllocatorDefault, 2, param_set_ptrs, param_set_sizes, 4, | |
| 304 &description); | |
| 305 if (status != noErr) { | |
| 306 LOG(LS_ERROR) << "Failed to create video format description."; | |
| 307 return nullptr; | |
| 308 } | |
| 309 return description; | |
| 310 } | |
| 311 | |
| 312 AnnexBBufferReader::AnnexBBufferReader(const uint8_t* annexb_buffer, | |
| 313 size_t length) | |
| 314 : start_(annexb_buffer), length_(length) { | |
| 315 RTC_DCHECK(annexb_buffer); | |
| 316 offsets_ = H264::FindNaluIndices(annexb_buffer, length); | |
| 317 offset_ = offsets_.begin(); | |
| 318 } | |
| 319 | |
| 320 bool AnnexBBufferReader::ReadNalu(const uint8_t** out_nalu, | |
| 321 size_t* out_length) { | |
| 322 RTC_DCHECK(out_nalu); | |
| 323 RTC_DCHECK(out_length); | |
| 324 *out_nalu = nullptr; | |
| 325 *out_length = 0; | |
| 326 | |
| 327 if (offset_ == offsets_.end()) { | |
| 328 return false; | |
| 329 } | |
| 330 *out_nalu = start_ + offset_->payload_start_offset; | |
| 331 *out_length = offset_->payload_size; | |
| 332 ++offset_; | |
| 333 return true; | |
| 334 } | |
| 335 | |
| 336 size_t AnnexBBufferReader::BytesRemaining() const { | |
| 337 if (offset_ == offsets_.end()) { | |
| 338 return 0; | |
| 339 } | |
| 340 return length_ - offset_->start_offset; | |
| 341 } | |
| 342 | |
| 343 AvccBufferWriter::AvccBufferWriter(uint8_t* const avcc_buffer, size_t length) | |
| 344 : start_(avcc_buffer), offset_(0), length_(length) { | |
| 345 RTC_DCHECK(avcc_buffer); | |
| 346 } | |
| 347 | |
| 348 bool AvccBufferWriter::WriteNalu(const uint8_t* data, size_t data_size) { | |
| 349 // Check if we can write this length of data. | |
| 350 if (data_size + kAvccHeaderByteSize > BytesRemaining()) { | |
| 351 return false; | |
| 352 } | |
| 353 // Write length header, which needs to be big endian. | |
| 354 uint32_t big_endian_length = CFSwapInt32HostToBig(data_size); | |
| 355 memcpy(start_ + offset_, &big_endian_length, sizeof(big_endian_length)); | |
| 356 offset_ += sizeof(big_endian_length); | |
| 357 // Write data. | |
| 358 memcpy(start_ + offset_, data, data_size); | |
| 359 offset_ += data_size; | |
| 360 return true; | |
| 361 } | |
| 362 | |
| 363 size_t AvccBufferWriter::BytesRemaining() const { | |
| 364 return length_ - offset_; | |
| 365 } | |
| 366 | |
| 367 } // namespace webrtc | |
| 368 | |
| 369 #endif // defined(WEBRTC_VIDEO_TOOLBOX_SUPPORTED) | |
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Chromium Code Reviews
Issue 2487723004:
Reland of Add a webrtc{en,de}coderfactory implementation for VideoToolbox (Closed)
