| OLD | NEW |
|---|
| (Empty) |
| 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_encoder.h" | |
| 13 | |
| 14 #if defined(WEBRTC_VIDEO_TOOLBOX_SUPPORTED) | |
| 15 | |
| 16 #include <memory> | |
| 17 #include <string> | |
| 18 #include <vector> | |
| 19 | |
| 20 #if defined(WEBRTC_IOS) | |
| 21 #include "RTCUIApplication.h" | |
| 22 #endif | |
| 23 #include "libyuv/convert_from.h" | |
| 24 #include "webrtc/base/checks.h" | |
| 25 #include "webrtc/base/logging.h" | |
| 26 #include "webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_nalu.h" | |
| 27 #include "webrtc/system_wrappers/include/clock.h" | |
| 28 | |
| 29 namespace internal { | |
| 30 | |
| 31 // The ratio between kVTCompressionPropertyKey_DataRateLimits and | |
| 32 // kVTCompressionPropertyKey_AverageBitRate. The data rate limit is set higher | |
| 33 // than the average bit rate to avoid undershooting the target. | |
| 34 const float kLimitToAverageBitRateFactor = 1.5f; | |
| 35 | |
| 36 // Convenience function for creating a dictionary. | |
| 37 inline CFDictionaryRef CreateCFDictionary(CFTypeRef* keys, | |
| 38 CFTypeRef* values, | |
| 39 size_t size) { | |
| 40 return CFDictionaryCreate(kCFAllocatorDefault, keys, values, size, | |
| 41 &kCFTypeDictionaryKeyCallBacks, | |
| 42 &kCFTypeDictionaryValueCallBacks); | |
| 43 } | |
| 44 | |
| 45 // Copies characters from a CFStringRef into a std::string. | |
| 46 std::string CFStringToString(const CFStringRef cf_string) { | |
| 47 RTC_DCHECK(cf_string); | |
| 48 std::string std_string; | |
| 49 // Get the size needed for UTF8 plus terminating character. | |
| 50 size_t buffer_size = | |
| 51 CFStringGetMaximumSizeForEncoding(CFStringGetLength(cf_string), | |
| 52 kCFStringEncodingUTF8) + | |
| 53 1; | |
| 54 std::unique_ptr<char[]> buffer(new char[buffer_size]); | |
| 55 if (CFStringGetCString(cf_string, buffer.get(), buffer_size, | |
| 56 kCFStringEncodingUTF8)) { | |
| 57 // Copy over the characters. | |
| 58 std_string.assign(buffer.get()); | |
| 59 } | |
| 60 return std_string; | |
| 61 } | |
| 62 | |
| 63 // Convenience function for setting a VT property. | |
| 64 void SetVTSessionProperty(VTSessionRef session, | |
| 65 CFStringRef key, | |
| 66 int32_t value) { | |
| 67 CFNumberRef cfNum = | |
| 68 CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &value); | |
| 69 OSStatus status = VTSessionSetProperty(session, key, cfNum); | |
| 70 CFRelease(cfNum); | |
| 71 if (status != noErr) { | |
| 72 std::string key_string = CFStringToString(key); | |
| 73 LOG(LS_ERROR) << "VTSessionSetProperty failed to set: " << key_string | |
| 74 << " to " << value << ": " << status; | |
| 75 } | |
| 76 } | |
| 77 | |
| 78 // Convenience function for setting a VT property. | |
| 79 void SetVTSessionProperty(VTSessionRef session, | |
| 80 CFStringRef key, | |
| 81 uint32_t value) { | |
| 82 int64_t value_64 = value; | |
| 83 CFNumberRef cfNum = | |
| 84 CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt64Type, &value_64); | |
| 85 OSStatus status = VTSessionSetProperty(session, key, cfNum); | |
| 86 CFRelease(cfNum); | |
| 87 if (status != noErr) { | |
| 88 std::string key_string = CFStringToString(key); | |
| 89 LOG(LS_ERROR) << "VTSessionSetProperty failed to set: " << key_string | |
| 90 << " to " << value << ": " << status; | |
| 91 } | |
| 92 } | |
| 93 | |
| 94 // Convenience function for setting a VT property. | |
| 95 void SetVTSessionProperty(VTSessionRef session, CFStringRef key, bool value) { | |
| 96 CFBooleanRef cf_bool = (value) ? kCFBooleanTrue : kCFBooleanFalse; | |
| 97 OSStatus status = VTSessionSetProperty(session, key, cf_bool); | |
| 98 if (status != noErr) { | |
| 99 std::string key_string = CFStringToString(key); | |
| 100 LOG(LS_ERROR) << "VTSessionSetProperty failed to set: " << key_string | |
| 101 << " to " << value << ": " << status; | |
| 102 } | |
| 103 } | |
| 104 | |
| 105 // Convenience function for setting a VT property. | |
| 106 void SetVTSessionProperty(VTSessionRef session, | |
| 107 CFStringRef key, | |
| 108 CFStringRef value) { | |
| 109 OSStatus status = VTSessionSetProperty(session, key, value); | |
| 110 if (status != noErr) { | |
| 111 std::string key_string = CFStringToString(key); | |
| 112 std::string val_string = CFStringToString(value); | |
| 113 LOG(LS_ERROR) << "VTSessionSetProperty failed to set: " << key_string | |
| 114 << " to " << val_string << ": " << status; | |
| 115 } | |
| 116 } | |
| 117 | |
| 118 // Struct that we pass to the encoder per frame to encode. We receive it again | |
| 119 // in the encoder callback. | |
| 120 struct FrameEncodeParams { | |
| 121 FrameEncodeParams(webrtc::H264VideoToolboxEncoder* e, | |
| 122 const webrtc::CodecSpecificInfo* csi, | |
| 123 int32_t w, | |
| 124 int32_t h, | |
| 125 int64_t rtms, | |
| 126 uint32_t ts, | |
| 127 webrtc::VideoRotation r) | |
| 128 : encoder(e), | |
| 129 width(w), | |
| 130 height(h), | |
| 131 render_time_ms(rtms), | |
| 132 timestamp(ts), | |
| 133 rotation(r) { | |
| 134 if (csi) { | |
| 135 codec_specific_info = *csi; | |
| 136 } else { | |
| 137 codec_specific_info.codecType = webrtc::kVideoCodecH264; | |
| 138 } | |
| 139 } | |
| 140 | |
| 141 webrtc::H264VideoToolboxEncoder* encoder; | |
| 142 webrtc::CodecSpecificInfo codec_specific_info; | |
| 143 int32_t width; | |
| 144 int32_t height; | |
| 145 int64_t render_time_ms; | |
| 146 uint32_t timestamp; | |
| 147 webrtc::VideoRotation rotation; | |
| 148 }; | |
| 149 | |
| 150 // We receive I420Frames as input, but we need to feed CVPixelBuffers into the | |
| 151 // encoder. This performs the copy and format conversion. | |
| 152 // TODO(tkchin): See if encoder will accept i420 frames and compare performance. | |
| 153 bool CopyVideoFrameToPixelBuffer( | |
| 154 const rtc::scoped_refptr<webrtc::VideoFrameBuffer>& frame, | |
| 155 CVPixelBufferRef pixel_buffer) { | |
| 156 RTC_DCHECK(pixel_buffer); | |
| 157 RTC_DCHECK(CVPixelBufferGetPixelFormatType(pixel_buffer) == | |
| 158 kCVPixelFormatType_420YpCbCr8BiPlanarFullRange); | |
| 159 RTC_DCHECK(CVPixelBufferGetHeightOfPlane(pixel_buffer, 0) == | |
| 160 static_cast<size_t>(frame->height())); | |
| 161 RTC_DCHECK(CVPixelBufferGetWidthOfPlane(pixel_buffer, 0) == | |
| 162 static_cast<size_t>(frame->width())); | |
| 163 | |
| 164 CVReturn cvRet = CVPixelBufferLockBaseAddress(pixel_buffer, 0); | |
| 165 if (cvRet != kCVReturnSuccess) { | |
| 166 LOG(LS_ERROR) << "Failed to lock base address: " << cvRet; | |
| 167 return false; | |
| 168 } | |
| 169 uint8_t* dst_y = reinterpret_cast<uint8_t*>( | |
| 170 CVPixelBufferGetBaseAddressOfPlane(pixel_buffer, 0)); | |
| 171 int dst_stride_y = CVPixelBufferGetBytesPerRowOfPlane(pixel_buffer, 0); | |
| 172 uint8_t* dst_uv = reinterpret_cast<uint8_t*>( | |
| 173 CVPixelBufferGetBaseAddressOfPlane(pixel_buffer, 1)); | |
| 174 int dst_stride_uv = CVPixelBufferGetBytesPerRowOfPlane(pixel_buffer, 1); | |
| 175 // Convert I420 to NV12. | |
| 176 int ret = libyuv::I420ToNV12( | |
| 177 frame->DataY(), frame->StrideY(), | |
| 178 frame->DataU(), frame->StrideU(), | |
| 179 frame->DataV(), frame->StrideV(), | |
| 180 dst_y, dst_stride_y, dst_uv, dst_stride_uv, | |
| 181 frame->width(), frame->height()); | |
| 182 CVPixelBufferUnlockBaseAddress(pixel_buffer, 0); | |
| 183 if (ret) { | |
| 184 LOG(LS_ERROR) << "Error converting I420 VideoFrame to NV12 :" << ret; | |
| 185 return false; | |
| 186 } | |
| 187 return true; | |
| 188 } | |
| 189 | |
| 190 // This is the callback function that VideoToolbox calls when encode is | |
| 191 // complete. From inspection this happens on its own queue. | |
| 192 void VTCompressionOutputCallback(void* encoder, | |
| 193 void* params, | |
| 194 OSStatus status, | |
| 195 VTEncodeInfoFlags info_flags, | |
| 196 CMSampleBufferRef sample_buffer) { | |
| 197 std::unique_ptr<FrameEncodeParams> encode_params( | |
| 198 reinterpret_cast<FrameEncodeParams*>(params)); | |
| 199 encode_params->encoder->OnEncodedFrame( | |
| 200 status, info_flags, sample_buffer, encode_params->codec_specific_info, | |
| 201 encode_params->width, encode_params->height, | |
| 202 encode_params->render_time_ms, encode_params->timestamp, | |
| 203 encode_params->rotation); | |
| 204 } | |
| 205 | |
| 206 } // namespace internal | |
| 207 | |
| 208 namespace webrtc { | |
| 209 | |
| 210 // .5 is set as a mininum to prevent overcompensating for large temporary | |
| 211 // overshoots. We don't want to degrade video quality too badly. | |
| 212 // .95 is set to prevent oscillations. When a lower bitrate is set on the | |
| 213 // encoder than previously set, its output seems to have a brief period of | |
| 214 // drastically reduced bitrate, so we want to avoid that. In steady state | |
| 215 // conditions, 0.95 seems to give us better overall bitrate over long periods | |
| 216 // of time. | |
| 217 H264VideoToolboxEncoder::H264VideoToolboxEncoder() | |
| 218 : callback_(nullptr), | |
| 219 compression_session_(nullptr), | |
| 220 bitrate_adjuster_(Clock::GetRealTimeClock(), .5, .95) {} | |
| 221 | |
| 222 H264VideoToolboxEncoder::~H264VideoToolboxEncoder() { | |
| 223 DestroyCompressionSession(); | |
| 224 } | |
| 225 | |
| 226 int H264VideoToolboxEncoder::InitEncode(const VideoCodec* codec_settings, | |
| 227 int number_of_cores, | |
| 228 size_t max_payload_size) { | |
| 229 RTC_DCHECK(codec_settings); | |
| 230 RTC_DCHECK_EQ(codec_settings->codecType, kVideoCodecH264); | |
| 231 { | |
| 232 rtc::CritScope lock(&quality_scaler_crit_); | |
| 233 quality_scaler_.Init(QualityScaler::kLowH264QpThreshold, | |
| 234 QualityScaler::kBadH264QpThreshold, | |
| 235 codec_settings->startBitrate, codec_settings->width, | |
| 236 codec_settings->height, codec_settings->maxFramerate); | |
| 237 QualityScaler::Resolution res = quality_scaler_.GetScaledResolution(); | |
| 238 // TODO(tkchin): We may need to enforce width/height dimension restrictions | |
| 239 // to match what the encoder supports. | |
| 240 width_ = res.width; | |
| 241 height_ = res.height; | |
| 242 } | |
| 243 // We can only set average bitrate on the HW encoder. | |
| 244 target_bitrate_bps_ = codec_settings->startBitrate; | |
| 245 bitrate_adjuster_.SetTargetBitrateBps(target_bitrate_bps_); | |
| 246 | |
| 247 // TODO(tkchin): Try setting payload size via | |
| 248 // kVTCompressionPropertyKey_MaxH264SliceBytes. | |
| 249 | |
| 250 return ResetCompressionSession(); | |
| 251 } | |
| 252 | |
| 253 rtc::scoped_refptr<VideoFrameBuffer> | |
| 254 H264VideoToolboxEncoder::GetScaledBufferOnEncode( | |
| 255 const rtc::scoped_refptr<VideoFrameBuffer>& frame) { | |
| 256 rtc::CritScope lock(&quality_scaler_crit_); | |
| 257 quality_scaler_.OnEncodeFrame(frame->width(), frame->height()); | |
| 258 if (!frame->native_handle()) | |
| 259 return quality_scaler_.GetScaledBuffer(frame); | |
| 260 | |
| 261 // Handle native (CVImageRef) scaling. | |
| 262 const QualityScaler::Resolution res = quality_scaler_.GetScaledResolution(); | |
| 263 if (res.width == frame->width() && res.height == frame->height()) | |
| 264 return frame; | |
| 265 // TODO(magjed): Implement efficient CVImageRef -> CVImageRef scaling instead | |
| 266 // of doing it via I420. | |
| 267 return quality_scaler_.GetScaledBuffer(frame->NativeToI420Buffer()); | |
| 268 } | |
| 269 | |
| 270 int H264VideoToolboxEncoder::Encode( | |
| 271 const VideoFrame& frame, | |
| 272 const CodecSpecificInfo* codec_specific_info, | |
| 273 const std::vector<FrameType>* frame_types) { | |
| 274 RTC_DCHECK(!frame.IsZeroSize()); | |
| 275 if (!callback_ || !compression_session_) { | |
| 276 return WEBRTC_VIDEO_CODEC_UNINITIALIZED; | |
| 277 } | |
| 278 #if defined(WEBRTC_IOS) | |
| 279 if (!RTCIsUIApplicationActive()) { | |
| 280 // Ignore all encode requests when app isn't active. In this state, the | |
| 281 // hardware encoder has been invalidated by the OS. | |
| 282 return WEBRTC_VIDEO_CODEC_OK; | |
| 283 } | |
| 284 #endif | |
| 285 bool is_keyframe_required = false; | |
| 286 rtc::scoped_refptr<VideoFrameBuffer> input_image( | |
| 287 GetScaledBufferOnEncode(frame.video_frame_buffer())); | |
| 288 | |
| 289 if (input_image->width() != width_ || input_image->height() != height_) { | |
| 290 width_ = input_image->width(); | |
| 291 height_ = input_image->height(); | |
| 292 int ret = ResetCompressionSession(); | |
| 293 if (ret < 0) | |
| 294 return ret; | |
| 295 } | |
| 296 | |
| 297 CVPixelBufferRef pixel_buffer = | |
| 298 static_cast<CVPixelBufferRef>(input_image->native_handle()); | |
| 299 if (pixel_buffer) { | |
| 300 CVBufferRetain(pixel_buffer); | |
| 301 } else { | |
| 302 // Get a pixel buffer from the pool and copy frame data over. | |
| 303 CVPixelBufferPoolRef pixel_buffer_pool = | |
| 304 VTCompressionSessionGetPixelBufferPool(compression_session_); | |
| 305 #if defined(WEBRTC_IOS) | |
| 306 if (!pixel_buffer_pool) { | |
| 307 // Kind of a hack. On backgrounding, the compression session seems to get | |
| 308 // invalidated, which causes this pool call to fail when the application | |
| 309 // is foregrounded and frames are being sent for encoding again. | |
| 310 // Resetting the session when this happens fixes the issue. | |
| 311 // In addition we request a keyframe so video can recover quickly. | |
| 312 ResetCompressionSession(); | |
| 313 pixel_buffer_pool = | |
| 314 VTCompressionSessionGetPixelBufferPool(compression_session_); | |
| 315 is_keyframe_required = true; | |
| 316 } | |
| 317 #endif | |
| 318 if (!pixel_buffer_pool) { | |
| 319 LOG(LS_ERROR) << "Failed to get pixel buffer pool."; | |
| 320 return WEBRTC_VIDEO_CODEC_ERROR; | |
| 321 } | |
| 322 CVReturn ret = CVPixelBufferPoolCreatePixelBuffer( | |
| 323 nullptr, pixel_buffer_pool, &pixel_buffer); | |
| 324 if (ret != kCVReturnSuccess) { | |
| 325 LOG(LS_ERROR) << "Failed to create pixel buffer: " << ret; | |
| 326 // We probably want to drop frames here, since failure probably means | |
| 327 // that the pool is empty. | |
| 328 return WEBRTC_VIDEO_CODEC_ERROR; | |
| 329 } | |
| 330 RTC_DCHECK(pixel_buffer); | |
| 331 if (!internal::CopyVideoFrameToPixelBuffer(input_image, pixel_buffer)) { | |
| 332 LOG(LS_ERROR) << "Failed to copy frame data."; | |
| 333 CVBufferRelease(pixel_buffer); | |
| 334 return WEBRTC_VIDEO_CODEC_ERROR; | |
| 335 } | |
| 336 } | |
| 337 | |
| 338 // Check if we need a keyframe. | |
| 339 if (!is_keyframe_required && frame_types) { | |
| 340 for (auto frame_type : *frame_types) { | |
| 341 if (frame_type == kVideoFrameKey) { | |
| 342 is_keyframe_required = true; | |
| 343 break; | |
| 344 } | |
| 345 } | |
| 346 } | |
| 347 | |
| 348 CMTime presentation_time_stamp = | |
| 349 CMTimeMake(frame.render_time_ms(), 1000); | |
| 350 CFDictionaryRef frame_properties = nullptr; | |
| 351 if (is_keyframe_required) { | |
| 352 CFTypeRef keys[] = {kVTEncodeFrameOptionKey_ForceKeyFrame}; | |
| 353 CFTypeRef values[] = {kCFBooleanTrue}; | |
| 354 frame_properties = internal::CreateCFDictionary(keys, values, 1); | |
| 355 } | |
| 356 std::unique_ptr<internal::FrameEncodeParams> encode_params; | |
| 357 encode_params.reset(new internal::FrameEncodeParams( | |
| 358 this, codec_specific_info, width_, height_, frame.render_time_ms(), | |
| 359 frame.timestamp(), frame.rotation())); | |
| 360 | |
| 361 // Update the bitrate if needed. | |
| 362 SetBitrateBps(bitrate_adjuster_.GetAdjustedBitrateBps()); | |
| 363 | |
| 364 OSStatus status = VTCompressionSessionEncodeFrame( | |
| 365 compression_session_, pixel_buffer, presentation_time_stamp, | |
| 366 kCMTimeInvalid, frame_properties, encode_params.release(), nullptr); | |
| 367 if (frame_properties) { | |
| 368 CFRelease(frame_properties); | |
| 369 } | |
| 370 if (pixel_buffer) { | |
| 371 CVBufferRelease(pixel_buffer); | |
| 372 } | |
| 373 if (status != noErr) { | |
| 374 LOG(LS_ERROR) << "Failed to encode frame with code: " << status; | |
| 375 return WEBRTC_VIDEO_CODEC_ERROR; | |
| 376 } | |
| 377 return WEBRTC_VIDEO_CODEC_OK; | |
| 378 } | |
| 379 | |
| 380 int H264VideoToolboxEncoder::RegisterEncodeCompleteCallback( | |
| 381 EncodedImageCallback* callback) { | |
| 382 callback_ = callback; | |
| 383 return WEBRTC_VIDEO_CODEC_OK; | |
| 384 } | |
| 385 | |
| 386 void H264VideoToolboxEncoder::OnDroppedFrame() { | |
| 387 rtc::CritScope lock(&quality_scaler_crit_); | |
| 388 quality_scaler_.ReportDroppedFrame(); | |
| 389 } | |
| 390 | |
| 391 int H264VideoToolboxEncoder::SetChannelParameters(uint32_t packet_loss, | |
| 392 int64_t rtt) { | |
| 393 // Encoder doesn't know anything about packet loss or rtt so just return. | |
| 394 return WEBRTC_VIDEO_CODEC_OK; | |
| 395 } | |
| 396 | |
| 397 int H264VideoToolboxEncoder::SetRates(uint32_t new_bitrate_kbit, | |
| 398 uint32_t frame_rate) { | |
| 399 target_bitrate_bps_ = 1000 * new_bitrate_kbit; | |
| 400 bitrate_adjuster_.SetTargetBitrateBps(target_bitrate_bps_); | |
| 401 SetBitrateBps(bitrate_adjuster_.GetAdjustedBitrateBps()); | |
| 402 | |
| 403 rtc::CritScope lock(&quality_scaler_crit_); | |
| 404 quality_scaler_.ReportFramerate(frame_rate); | |
| 405 | |
| 406 return WEBRTC_VIDEO_CODEC_OK; | |
| 407 } | |
| 408 | |
| 409 int H264VideoToolboxEncoder::Release() { | |
| 410 // Need to reset so that the session is invalidated and won't use the | |
| 411 // callback anymore. Do not remove callback until the session is invalidated | |
| 412 // since async encoder callbacks can occur until invalidation. | |
| 413 int ret = ResetCompressionSession(); | |
| 414 callback_ = nullptr; | |
| 415 return ret; | |
| 416 } | |
| 417 | |
| 418 int H264VideoToolboxEncoder::ResetCompressionSession() { | |
| 419 DestroyCompressionSession(); | |
| 420 | |
| 421 // Set source image buffer attributes. These attributes will be present on | |
| 422 // buffers retrieved from the encoder's pixel buffer pool. | |
| 423 const size_t attributes_size = 3; | |
| 424 CFTypeRef keys[attributes_size] = { | |
| 425 #if defined(WEBRTC_IOS) | |
| 426 kCVPixelBufferOpenGLESCompatibilityKey, | |
| 427 #elif defined(WEBRTC_MAC) | |
| 428 kCVPixelBufferOpenGLCompatibilityKey, | |
| 429 #endif | |
| 430 kCVPixelBufferIOSurfacePropertiesKey, | |
| 431 kCVPixelBufferPixelFormatTypeKey | |
| 432 }; | |
| 433 CFDictionaryRef io_surface_value = | |
| 434 internal::CreateCFDictionary(nullptr, nullptr, 0); | |
| 435 int64_t nv12type = kCVPixelFormatType_420YpCbCr8BiPlanarFullRange; | |
| 436 CFNumberRef pixel_format = | |
| 437 CFNumberCreate(nullptr, kCFNumberLongType, &nv12type); | |
| 438 CFTypeRef values[attributes_size] = {kCFBooleanTrue, io_surface_value, | |
| 439 pixel_format}; | |
| 440 CFDictionaryRef source_attributes = | |
| 441 internal::CreateCFDictionary(keys, values, attributes_size); | |
| 442 if (io_surface_value) { | |
| 443 CFRelease(io_surface_value); | |
| 444 io_surface_value = nullptr; | |
| 445 } | |
| 446 if (pixel_format) { | |
| 447 CFRelease(pixel_format); | |
| 448 pixel_format = nullptr; | |
| 449 } | |
| 450 OSStatus status = VTCompressionSessionCreate( | |
| 451 nullptr, // use default allocator | |
| 452 width_, height_, kCMVideoCodecType_H264, | |
| 453 nullptr, // use default encoder | |
| 454 source_attributes, | |
| 455 nullptr, // use default compressed data allocator | |
| 456 internal::VTCompressionOutputCallback, this, &compression_session_); | |
| 457 if (source_attributes) { | |
| 458 CFRelease(source_attributes); | |
| 459 source_attributes = nullptr; | |
| 460 } | |
| 461 if (status != noErr) { | |
| 462 LOG(LS_ERROR) << "Failed to create compression session: " << status; | |
| 463 return WEBRTC_VIDEO_CODEC_ERROR; | |
| 464 } | |
| 465 ConfigureCompressionSession(); | |
| 466 return WEBRTC_VIDEO_CODEC_OK; | |
| 467 } | |
| 468 | |
| 469 void H264VideoToolboxEncoder::ConfigureCompressionSession() { | |
| 470 RTC_DCHECK(compression_session_); | |
| 471 internal::SetVTSessionProperty(compression_session_, | |
| 472 kVTCompressionPropertyKey_RealTime, true); | |
| 473 internal::SetVTSessionProperty(compression_session_, | |
| 474 kVTCompressionPropertyKey_ProfileLevel, | |
| 475 kVTProfileLevel_H264_Baseline_AutoLevel); | |
| 476 internal::SetVTSessionProperty(compression_session_, | |
| 477 kVTCompressionPropertyKey_AllowFrameReordering, | |
| 478 false); | |
| 479 SetEncoderBitrateBps(target_bitrate_bps_); | |
| 480 // TODO(tkchin): Look at entropy mode and colorspace matrices. | |
| 481 // TODO(tkchin): Investigate to see if there's any way to make this work. | |
| 482 // May need it to interop with Android. Currently this call just fails. | |
| 483 // On inspecting encoder output on iOS8, this value is set to 6. | |
| 484 // internal::SetVTSessionProperty(compression_session_, | |
| 485 // kVTCompressionPropertyKey_MaxFrameDelayCount, | |
| 486 // 1); | |
| 487 | |
| 488 // Set a relatively large value for keyframe emission (7200 frames or | |
| 489 // 4 minutes). | |
| 490 internal::SetVTSessionProperty( | |
| 491 compression_session_, | |
| 492 kVTCompressionPropertyKey_MaxKeyFrameInterval, 7200); | |
| 493 internal::SetVTSessionProperty( | |
| 494 compression_session_, | |
| 495 kVTCompressionPropertyKey_MaxKeyFrameIntervalDuration, 240); | |
| 496 } | |
| 497 | |
| 498 void H264VideoToolboxEncoder::DestroyCompressionSession() { | |
| 499 if (compression_session_) { | |
| 500 VTCompressionSessionInvalidate(compression_session_); | |
| 501 CFRelease(compression_session_); | |
| 502 compression_session_ = nullptr; | |
| 503 } | |
| 504 } | |
| 505 | |
| 506 const char* H264VideoToolboxEncoder::ImplementationName() const { | |
| 507 return "VideoToolbox"; | |
| 508 } | |
| 509 | |
| 510 bool H264VideoToolboxEncoder::SupportsNativeHandle() const { | |
| 511 return true; | |
| 512 } | |
| 513 | |
| 514 void H264VideoToolboxEncoder::SetBitrateBps(uint32_t bitrate_bps) { | |
| 515 if (encoder_bitrate_bps_ != bitrate_bps) { | |
| 516 SetEncoderBitrateBps(bitrate_bps); | |
| 517 } | |
| 518 } | |
| 519 | |
| 520 void H264VideoToolboxEncoder::SetEncoderBitrateBps(uint32_t bitrate_bps) { | |
| 521 if (compression_session_) { | |
| 522 internal::SetVTSessionProperty(compression_session_, | |
| 523 kVTCompressionPropertyKey_AverageBitRate, | |
| 524 bitrate_bps); | |
| 525 | |
| 526 // TODO(tkchin): Add a helper method to set array value. | |
| 527 int64_t data_limit_bytes_per_second_value = static_cast<int64_t>( | |
| 528 bitrate_bps * internal::kLimitToAverageBitRateFactor / 8); | |
| 529 CFNumberRef bytes_per_second = | |
| 530 CFNumberCreate(kCFAllocatorDefault, | |
| 531 kCFNumberSInt64Type, | |
| 532 &data_limit_bytes_per_second_value); | |
| 533 int64_t one_second_value = 1; | |
| 534 CFNumberRef one_second = | |
| 535 CFNumberCreate(kCFAllocatorDefault, | |
| 536 kCFNumberSInt64Type, | |
| 537 &one_second_value); | |
| 538 const void* nums[2] = { bytes_per_second, one_second }; | |
| 539 CFArrayRef data_rate_limits = | |
| 540 CFArrayCreate(nullptr, nums, 2, &kCFTypeArrayCallBacks); | |
| 541 OSStatus status = | |
| 542 VTSessionSetProperty(compression_session_, | |
| 543 kVTCompressionPropertyKey_DataRateLimits, | |
| 544 data_rate_limits); | |
| 545 if (bytes_per_second) { | |
| 546 CFRelease(bytes_per_second); | |
| 547 } | |
| 548 if (one_second) { | |
| 549 CFRelease(one_second); | |
| 550 } | |
| 551 if (data_rate_limits) { | |
| 552 CFRelease(data_rate_limits); | |
| 553 } | |
| 554 if (status != noErr) { | |
| 555 LOG(LS_ERROR) << "Failed to set data rate limit"; | |
| 556 } | |
| 557 | |
| 558 encoder_bitrate_bps_ = bitrate_bps; | |
| 559 } | |
| 560 } | |
| 561 | |
| 562 void H264VideoToolboxEncoder::OnEncodedFrame( | |
| 563 OSStatus status, | |
| 564 VTEncodeInfoFlags info_flags, | |
| 565 CMSampleBufferRef sample_buffer, | |
| 566 CodecSpecificInfo codec_specific_info, | |
| 567 int32_t width, | |
| 568 int32_t height, | |
| 569 int64_t render_time_ms, | |
| 570 uint32_t timestamp, | |
| 571 VideoRotation rotation) { | |
| 572 if (status != noErr) { | |
| 573 LOG(LS_ERROR) << "H264 encode failed."; | |
| 574 return; | |
| 575 } | |
| 576 if (info_flags & kVTEncodeInfo_FrameDropped) { | |
| 577 LOG(LS_INFO) << "H264 encode dropped frame."; | |
| 578 rtc::CritScope lock(&quality_scaler_crit_); | |
| 579 quality_scaler_.ReportDroppedFrame(); | |
| 580 return; | |
| 581 } | |
| 582 | |
| 583 bool is_keyframe = false; | |
| 584 CFArrayRef attachments = | |
| 585 CMSampleBufferGetSampleAttachmentsArray(sample_buffer, 0); | |
| 586 if (attachments != nullptr && CFArrayGetCount(attachments)) { | |
| 587 CFDictionaryRef attachment = | |
| 588 static_cast<CFDictionaryRef>(CFArrayGetValueAtIndex(attachments, 0)); | |
| 589 is_keyframe = | |
| 590 !CFDictionaryContainsKey(attachment, kCMSampleAttachmentKey_NotSync); | |
| 591 } | |
| 592 | |
| 593 if (is_keyframe) { | |
| 594 LOG(LS_INFO) << "Generated keyframe"; | |
| 595 } | |
| 596 | |
| 597 // Convert the sample buffer into a buffer suitable for RTP packetization. | |
| 598 // TODO(tkchin): Allocate buffers through a pool. | |
| 599 std::unique_ptr<rtc::Buffer> buffer(new rtc::Buffer()); | |
| 600 std::unique_ptr<webrtc::RTPFragmentationHeader> header; | |
| 601 { | |
| 602 webrtc::RTPFragmentationHeader* header_raw; | |
| 603 bool result = H264CMSampleBufferToAnnexBBuffer(sample_buffer, is_keyframe, | |
| 604 buffer.get(), &header_raw); | |
| 605 header.reset(header_raw); | |
| 606 if (!result) { | |
| 607 return; | |
| 608 } | |
| 609 } | |
| 610 webrtc::EncodedImage frame(buffer->data(), buffer->size(), buffer->size()); | |
| 611 frame._encodedWidth = width; | |
| 612 frame._encodedHeight = height; | |
| 613 frame._completeFrame = true; | |
| 614 frame._frameType = | |
| 615 is_keyframe ? webrtc::kVideoFrameKey : webrtc::kVideoFrameDelta; | |
| 616 frame.capture_time_ms_ = render_time_ms; | |
| 617 frame._timeStamp = timestamp; | |
| 618 frame.rotation_ = rotation; | |
| 619 | |
| 620 h264_bitstream_parser_.ParseBitstream(buffer->data(), buffer->size()); | |
| 621 int qp; | |
| 622 if (h264_bitstream_parser_.GetLastSliceQp(&qp)) { | |
| 623 rtc::CritScope lock(&quality_scaler_crit_); | |
| 624 quality_scaler_.ReportQP(qp); | |
| 625 } | |
| 626 | |
| 627 int result = callback_->Encoded(frame, &codec_specific_info, header.get()); | |
| 628 if (result != 0) { | |
| 629 LOG(LS_ERROR) << "Encode callback failed: " << result; | |
| 630 return; | |
| 631 } | |
| 632 bitrate_adjuster_.Update(frame._size); | |
| 633 } | |
| 634 | |
| 635 } // namespace webrtc | |
| 636 | |
| 637 #endif // defined(WEBRTC_VIDEO_TOOLBOX_SUPPORTED) | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 2205763002:
Disable encoder scaling on iPhone4S. (Closed)
Base URL: https://chromium.googlesource.com/external/webrtc.git@master