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Unified Diff: webrtc/sdk/objc/Framework/Classes/VideoToolbox/encoder.mm

Issue 2890513002: Revert of Split iOS sdk in to separate targets (Closed)
Patch Set: Created 3 years, 7 months ago
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Index: webrtc/sdk/objc/Framework/Classes/VideoToolbox/encoder.mm
diff --git a/webrtc/sdk/objc/Framework/Classes/VideoToolbox/encoder.mm b/webrtc/sdk/objc/Framework/Classes/VideoToolbox/encoder.mm
deleted file mode 100644
index 8ff27f8d3ac22c20de9e24cf10077ac6b471371a..0000000000000000000000000000000000000000
--- a/webrtc/sdk/objc/Framework/Classes/VideoToolbox/encoder.mm
+++ /dev/null
@@ -1,746 +0,0 @@
-/*
- * Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
- *
- * Use of this source code is governed by a BSD-style license
- * that can be found in the LICENSE file in the root of the source
- * tree. An additional intellectual property rights grant can be found
- * in the file PATENTS. All contributing project authors may
- * be found in the AUTHORS file in the root of the source tree.
- *
- */
-
-#include "webrtc/sdk/objc/Framework/Classes/VideoToolbox/encoder.h"
-
-#include <memory>
-#include <string>
-#include <vector>
-
-#if defined(WEBRTC_IOS)
-#import "WebRTC/UIDevice+RTCDevice.h"
-#include "Common/RTCUIApplication.h"
-#endif
-#include "libyuv/convert_from.h"
-#include "webrtc/base/checks.h"
-#include "webrtc/base/logging.h"
-#include "webrtc/common_video/h264/profile_level_id.h"
-#include "webrtc/sdk/objc/Framework/Classes/Video/corevideo_frame_buffer.h"
-#include "webrtc/sdk/objc/Framework/Classes/VideoToolbox/nalu_rewriter.h"
-#include "webrtc/system_wrappers/include/clock.h"
-
-namespace internal {
-
-// The ratio between kVTCompressionPropertyKey_DataRateLimits and
-// kVTCompressionPropertyKey_AverageBitRate. The data rate limit is set higher
-// than the average bit rate to avoid undershooting the target.
-const float kLimitToAverageBitRateFactor = 1.5f;
-// These thresholds deviate from the default h264 QP thresholds, as they
-// have been found to work better on devices that support VideoToolbox
-const int kLowH264QpThreshold = 28;
-const int kHighH264QpThreshold = 39;
-
-// Convenience function for creating a dictionary.
-inline CFDictionaryRef CreateCFDictionary(CFTypeRef* keys,
- CFTypeRef* values,
- size_t size) {
- return CFDictionaryCreate(kCFAllocatorDefault, keys, values, size,
- &kCFTypeDictionaryKeyCallBacks,
- &kCFTypeDictionaryValueCallBacks);
-}
-
-// Copies characters from a CFStringRef into a std::string.
-std::string CFStringToString(const CFStringRef cf_string) {
- RTC_DCHECK(cf_string);
- std::string std_string;
- // Get the size needed for UTF8 plus terminating character.
- size_t buffer_size =
- CFStringGetMaximumSizeForEncoding(CFStringGetLength(cf_string),
- kCFStringEncodingUTF8) +
- 1;
- std::unique_ptr<char[]> buffer(new char[buffer_size]);
- if (CFStringGetCString(cf_string, buffer.get(), buffer_size,
- kCFStringEncodingUTF8)) {
- // Copy over the characters.
- std_string.assign(buffer.get());
- }
- return std_string;
-}
-
-// Convenience function for setting a VT property.
-void SetVTSessionProperty(VTSessionRef session,
- CFStringRef key,
- int32_t value) {
- CFNumberRef cfNum =
- CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &value);
- OSStatus status = VTSessionSetProperty(session, key, cfNum);
- CFRelease(cfNum);
- if (status != noErr) {
- std::string key_string = CFStringToString(key);
- LOG(LS_ERROR) << "VTSessionSetProperty failed to set: " << key_string
- << " to " << value << ": " << status;
- }
-}
-
-// Convenience function for setting a VT property.
-void SetVTSessionProperty(VTSessionRef session,
- CFStringRef key,
- uint32_t value) {
- int64_t value_64 = value;
- CFNumberRef cfNum =
- CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt64Type, &value_64);
- OSStatus status = VTSessionSetProperty(session, key, cfNum);
- CFRelease(cfNum);
- if (status != noErr) {
- std::string key_string = CFStringToString(key);
- LOG(LS_ERROR) << "VTSessionSetProperty failed to set: " << key_string
- << " to " << value << ": " << status;
- }
-}
-
-// Convenience function for setting a VT property.
-void SetVTSessionProperty(VTSessionRef session, CFStringRef key, bool value) {
- CFBooleanRef cf_bool = (value) ? kCFBooleanTrue : kCFBooleanFalse;
- OSStatus status = VTSessionSetProperty(session, key, cf_bool);
- if (status != noErr) {
- std::string key_string = CFStringToString(key);
- LOG(LS_ERROR) << "VTSessionSetProperty failed to set: " << key_string
- << " to " << value << ": " << status;
- }
-}
-
-// Convenience function for setting a VT property.
-void SetVTSessionProperty(VTSessionRef session,
- CFStringRef key,
- CFStringRef value) {
- OSStatus status = VTSessionSetProperty(session, key, value);
- if (status != noErr) {
- std::string key_string = CFStringToString(key);
- std::string val_string = CFStringToString(value);
- LOG(LS_ERROR) << "VTSessionSetProperty failed to set: " << key_string
- << " to " << val_string << ": " << status;
- }
-}
-
-// Struct that we pass to the encoder per frame to encode. We receive it again
-// in the encoder callback.
-struct FrameEncodeParams {
- FrameEncodeParams(webrtc::H264VideoToolboxEncoder* e,
- const webrtc::CodecSpecificInfo* csi,
- int32_t w,
- int32_t h,
- int64_t rtms,
- uint32_t ts,
- webrtc::VideoRotation r)
- : encoder(e),
- width(w),
- height(h),
- render_time_ms(rtms),
- timestamp(ts),
- rotation(r) {
- if (csi) {
- codec_specific_info = *csi;
- } else {
- codec_specific_info.codecType = webrtc::kVideoCodecH264;
- }
- }
-
- webrtc::H264VideoToolboxEncoder* encoder;
- webrtc::CodecSpecificInfo codec_specific_info;
- int32_t width;
- int32_t height;
- int64_t render_time_ms;
- uint32_t timestamp;
- webrtc::VideoRotation rotation;
-};
-
-// We receive I420Frames as input, but we need to feed CVPixelBuffers into the
-// encoder. This performs the copy and format conversion.
-// TODO(tkchin): See if encoder will accept i420 frames and compare performance.
-bool CopyVideoFrameToPixelBuffer(
- const rtc::scoped_refptr<webrtc::VideoFrameBuffer>& frame,
- CVPixelBufferRef pixel_buffer) {
- RTC_DCHECK(pixel_buffer);
- RTC_DCHECK_EQ(CVPixelBufferGetPixelFormatType(pixel_buffer),
- kCVPixelFormatType_420YpCbCr8BiPlanarFullRange);
- RTC_DCHECK_EQ(CVPixelBufferGetHeightOfPlane(pixel_buffer, 0),
- static_cast<size_t>(frame->height()));
- RTC_DCHECK_EQ(CVPixelBufferGetWidthOfPlane(pixel_buffer, 0),
- static_cast<size_t>(frame->width()));
-
- CVReturn cvRet = CVPixelBufferLockBaseAddress(pixel_buffer, 0);
- if (cvRet != kCVReturnSuccess) {
- LOG(LS_ERROR) << "Failed to lock base address: " << cvRet;
- return false;
- }
- uint8_t* dst_y = reinterpret_cast<uint8_t*>(
- CVPixelBufferGetBaseAddressOfPlane(pixel_buffer, 0));
- int dst_stride_y = CVPixelBufferGetBytesPerRowOfPlane(pixel_buffer, 0);
- uint8_t* dst_uv = reinterpret_cast<uint8_t*>(
- CVPixelBufferGetBaseAddressOfPlane(pixel_buffer, 1));
- int dst_stride_uv = CVPixelBufferGetBytesPerRowOfPlane(pixel_buffer, 1);
- // Convert I420 to NV12.
- int ret = libyuv::I420ToNV12(
- frame->DataY(), frame->StrideY(),
- frame->DataU(), frame->StrideU(),
- frame->DataV(), frame->StrideV(),
- dst_y, dst_stride_y, dst_uv, dst_stride_uv,
- frame->width(), frame->height());
- CVPixelBufferUnlockBaseAddress(pixel_buffer, 0);
- if (ret) {
- LOG(LS_ERROR) << "Error converting I420 VideoFrame to NV12 :" << ret;
- return false;
- }
- return true;
-}
-
-CVPixelBufferRef CreatePixelBuffer(CVPixelBufferPoolRef pixel_buffer_pool) {
- if (!pixel_buffer_pool) {
- LOG(LS_ERROR) << "Failed to get pixel buffer pool.";
- return nullptr;
- }
- CVPixelBufferRef pixel_buffer;
- CVReturn ret = CVPixelBufferPoolCreatePixelBuffer(nullptr, pixel_buffer_pool,
- &pixel_buffer);
- if (ret != kCVReturnSuccess) {
- LOG(LS_ERROR) << "Failed to create pixel buffer: " << ret;
- // We probably want to drop frames here, since failure probably means
- // that the pool is empty.
- return nullptr;
- }
- return pixel_buffer;
-}
-
-// This is the callback function that VideoToolbox calls when encode is
-// complete. From inspection this happens on its own queue.
-void VTCompressionOutputCallback(void* encoder,
- void* params,
- OSStatus status,
- VTEncodeInfoFlags info_flags,
- CMSampleBufferRef sample_buffer) {
- std::unique_ptr<FrameEncodeParams> encode_params(
- reinterpret_cast<FrameEncodeParams*>(params));
- encode_params->encoder->OnEncodedFrame(
- status, info_flags, sample_buffer, encode_params->codec_specific_info,
- encode_params->width, encode_params->height,
- encode_params->render_time_ms, encode_params->timestamp,
- encode_params->rotation);
-}
-
-// Extract VideoToolbox profile out of the cricket::VideoCodec. If there is no
-// specific VideoToolbox profile for the specified level, AutoLevel will be
-// returned. The user must initialize the encoder with a resolution and
-// framerate conforming to the selected H264 level regardless.
-CFStringRef ExtractProfile(const cricket::VideoCodec& codec) {
- const rtc::Optional<webrtc::H264::ProfileLevelId> profile_level_id =
- webrtc::H264::ParseSdpProfileLevelId(codec.params);
- RTC_DCHECK(profile_level_id);
- switch (profile_level_id->profile) {
- case webrtc::H264::kProfileConstrainedBaseline:
- case webrtc::H264::kProfileBaseline:
- switch (profile_level_id->level) {
- case webrtc::H264::kLevel3:
- return kVTProfileLevel_H264_Baseline_3_0;
- case webrtc::H264::kLevel3_1:
- return kVTProfileLevel_H264_Baseline_3_1;
- case webrtc::H264::kLevel3_2:
- return kVTProfileLevel_H264_Baseline_3_2;
- case webrtc::H264::kLevel4:
- return kVTProfileLevel_H264_Baseline_4_0;
- case webrtc::H264::kLevel4_1:
- return kVTProfileLevel_H264_Baseline_4_1;
- case webrtc::H264::kLevel4_2:
- return kVTProfileLevel_H264_Baseline_4_2;
- case webrtc::H264::kLevel5:
- return kVTProfileLevel_H264_Baseline_5_0;
- case webrtc::H264::kLevel5_1:
- return kVTProfileLevel_H264_Baseline_5_1;
- case webrtc::H264::kLevel5_2:
- return kVTProfileLevel_H264_Baseline_5_2;
- case webrtc::H264::kLevel1:
- case webrtc::H264::kLevel1_b:
- case webrtc::H264::kLevel1_1:
- case webrtc::H264::kLevel1_2:
- case webrtc::H264::kLevel1_3:
- case webrtc::H264::kLevel2:
- case webrtc::H264::kLevel2_1:
- case webrtc::H264::kLevel2_2:
- return kVTProfileLevel_H264_Baseline_AutoLevel;
- }
-
- case webrtc::H264::kProfileMain:
- switch (profile_level_id->level) {
- case webrtc::H264::kLevel3:
- return kVTProfileLevel_H264_Main_3_0;
- case webrtc::H264::kLevel3_1:
- return kVTProfileLevel_H264_Main_3_1;
- case webrtc::H264::kLevel3_2:
- return kVTProfileLevel_H264_Main_3_2;
- case webrtc::H264::kLevel4:
- return kVTProfileLevel_H264_Main_4_0;
- case webrtc::H264::kLevel4_1:
- return kVTProfileLevel_H264_Main_4_1;
- case webrtc::H264::kLevel4_2:
- return kVTProfileLevel_H264_Main_4_2;
- case webrtc::H264::kLevel5:
- return kVTProfileLevel_H264_Main_5_0;
- case webrtc::H264::kLevel5_1:
- return kVTProfileLevel_H264_Main_5_1;
- case webrtc::H264::kLevel5_2:
- return kVTProfileLevel_H264_Main_5_2;
- case webrtc::H264::kLevel1:
- case webrtc::H264::kLevel1_b:
- case webrtc::H264::kLevel1_1:
- case webrtc::H264::kLevel1_2:
- case webrtc::H264::kLevel1_3:
- case webrtc::H264::kLevel2:
- case webrtc::H264::kLevel2_1:
- case webrtc::H264::kLevel2_2:
- return kVTProfileLevel_H264_Main_AutoLevel;
- }
-
- case webrtc::H264::kProfileConstrainedHigh:
- case webrtc::H264::kProfileHigh:
- switch (profile_level_id->level) {
- case webrtc::H264::kLevel3:
- return kVTProfileLevel_H264_High_3_0;
- case webrtc::H264::kLevel3_1:
- return kVTProfileLevel_H264_High_3_1;
- case webrtc::H264::kLevel3_2:
- return kVTProfileLevel_H264_High_3_2;
- case webrtc::H264::kLevel4:
- return kVTProfileLevel_H264_High_4_0;
- case webrtc::H264::kLevel4_1:
- return kVTProfileLevel_H264_High_4_1;
- case webrtc::H264::kLevel4_2:
- return kVTProfileLevel_H264_High_4_2;
- case webrtc::H264::kLevel5:
- return kVTProfileLevel_H264_High_5_0;
- case webrtc::H264::kLevel5_1:
- return kVTProfileLevel_H264_High_5_1;
- case webrtc::H264::kLevel5_2:
- return kVTProfileLevel_H264_High_5_2;
- case webrtc::H264::kLevel1:
- case webrtc::H264::kLevel1_b:
- case webrtc::H264::kLevel1_1:
- case webrtc::H264::kLevel1_2:
- case webrtc::H264::kLevel1_3:
- case webrtc::H264::kLevel2:
- case webrtc::H264::kLevel2_1:
- case webrtc::H264::kLevel2_2:
- return kVTProfileLevel_H264_High_AutoLevel;
- }
- }
-}
-
-} // namespace internal
-
-namespace webrtc {
-
-// .5 is set as a mininum to prevent overcompensating for large temporary
-// overshoots. We don't want to degrade video quality too badly.
-// .95 is set to prevent oscillations. When a lower bitrate is set on the
-// encoder than previously set, its output seems to have a brief period of
-// drastically reduced bitrate, so we want to avoid that. In steady state
-// conditions, 0.95 seems to give us better overall bitrate over long periods
-// of time.
-H264VideoToolboxEncoder::H264VideoToolboxEncoder(const cricket::VideoCodec& codec)
- : callback_(nullptr),
- compression_session_(nullptr),
- bitrate_adjuster_(Clock::GetRealTimeClock(), .5, .95),
- packetization_mode_(H264PacketizationMode::NonInterleaved),
- profile_(internal::ExtractProfile(codec)) {
- LOG(LS_INFO) << "Using profile " << internal::CFStringToString(profile_);
- RTC_CHECK(cricket::CodecNamesEq(codec.name, cricket::kH264CodecName));
-}
-
-H264VideoToolboxEncoder::~H264VideoToolboxEncoder() {
- DestroyCompressionSession();
-}
-
-int H264VideoToolboxEncoder::InitEncode(const VideoCodec* codec_settings,
- int number_of_cores,
- size_t max_payload_size) {
- RTC_DCHECK(codec_settings);
- RTC_DCHECK_EQ(codec_settings->codecType, kVideoCodecH264);
-
- width_ = codec_settings->width;
- height_ = codec_settings->height;
- mode_ = codec_settings->mode;
- // We can only set average bitrate on the HW encoder.
- target_bitrate_bps_ = codec_settings->startBitrate;
- bitrate_adjuster_.SetTargetBitrateBps(target_bitrate_bps_);
-
- // TODO(tkchin): Try setting payload size via
- // kVTCompressionPropertyKey_MaxH264SliceBytes.
-
- return ResetCompressionSession();
-}
-
-int H264VideoToolboxEncoder::Encode(
- const VideoFrame& frame,
- const CodecSpecificInfo* codec_specific_info,
- const std::vector<FrameType>* frame_types) {
- // |input_frame| size should always match codec settings.
- RTC_DCHECK_EQ(frame.width(), width_);
- RTC_DCHECK_EQ(frame.height(), height_);
- if (!callback_ || !compression_session_) {
- return WEBRTC_VIDEO_CODEC_UNINITIALIZED;
- }
-#if defined(WEBRTC_IOS)
- if (!RTCIsUIApplicationActive()) {
- // Ignore all encode requests when app isn't active. In this state, the
- // hardware encoder has been invalidated by the OS.
- return WEBRTC_VIDEO_CODEC_OK;
- }
-#endif
- bool is_keyframe_required = false;
-
- // Get a pixel buffer from the pool and copy frame data over.
- CVPixelBufferPoolRef pixel_buffer_pool =
- VTCompressionSessionGetPixelBufferPool(compression_session_);
-#if defined(WEBRTC_IOS)
- if (!pixel_buffer_pool) {
- // Kind of a hack. On backgrounding, the compression session seems to get
- // invalidated, which causes this pool call to fail when the application
- // is foregrounded and frames are being sent for encoding again.
- // Resetting the session when this happens fixes the issue.
- // In addition we request a keyframe so video can recover quickly.
- ResetCompressionSession();
- pixel_buffer_pool =
- VTCompressionSessionGetPixelBufferPool(compression_session_);
- is_keyframe_required = true;
- LOG(LS_INFO) << "Resetting compression session due to invalid pool.";
- }
-#endif
-
- CVPixelBufferRef pixel_buffer = static_cast<CVPixelBufferRef>(
- frame.video_frame_buffer()->native_handle());
- if (pixel_buffer) {
- // Native frame.
- rtc::scoped_refptr<CoreVideoFrameBuffer> core_video_frame_buffer(
- static_cast<CoreVideoFrameBuffer*>(frame.video_frame_buffer().get()));
- if (!core_video_frame_buffer->RequiresCropping()) {
- // This pixel buffer might have a higher resolution than what the
- // compression session is configured to. The compression session can
- // handle that and will output encoded frames in the configured
- // resolution regardless of the input pixel buffer resolution.
- CVBufferRetain(pixel_buffer);
- } else {
- // Cropping required, we need to crop and scale to a new pixel buffer.
- pixel_buffer = internal::CreatePixelBuffer(pixel_buffer_pool);
- if (!pixel_buffer) {
- return WEBRTC_VIDEO_CODEC_ERROR;
- }
- if (!core_video_frame_buffer->CropAndScaleTo(&nv12_scale_buffer_,
- pixel_buffer)) {
- return WEBRTC_VIDEO_CODEC_ERROR;
- }
- }
- } else {
- pixel_buffer = internal::CreatePixelBuffer(pixel_buffer_pool);
- if (!pixel_buffer) {
- return WEBRTC_VIDEO_CODEC_ERROR;
- }
- RTC_DCHECK(pixel_buffer);
- if (!internal::CopyVideoFrameToPixelBuffer(frame.video_frame_buffer(),
- pixel_buffer)) {
- LOG(LS_ERROR) << "Failed to copy frame data.";
- CVBufferRelease(pixel_buffer);
- return WEBRTC_VIDEO_CODEC_ERROR;
- }
- }
-
- // Check if we need a keyframe.
- if (!is_keyframe_required && frame_types) {
- for (auto frame_type : *frame_types) {
- if (frame_type == kVideoFrameKey) {
- is_keyframe_required = true;
- break;
- }
- }
- }
-
- CMTime presentation_time_stamp =
- CMTimeMake(frame.render_time_ms(), 1000);
- CFDictionaryRef frame_properties = nullptr;
- if (is_keyframe_required) {
- CFTypeRef keys[] = {kVTEncodeFrameOptionKey_ForceKeyFrame};
- CFTypeRef values[] = {kCFBooleanTrue};
- frame_properties = internal::CreateCFDictionary(keys, values, 1);
- }
- std::unique_ptr<internal::FrameEncodeParams> encode_params;
- encode_params.reset(new internal::FrameEncodeParams(
- this, codec_specific_info, width_, height_, frame.render_time_ms(),
- frame.timestamp(), frame.rotation()));
-
- encode_params->codec_specific_info.codecSpecific.H264.packetization_mode =
- packetization_mode_;
-
- // Update the bitrate if needed.
- SetBitrateBps(bitrate_adjuster_.GetAdjustedBitrateBps());
-
- OSStatus status = VTCompressionSessionEncodeFrame(
- compression_session_, pixel_buffer, presentation_time_stamp,
- kCMTimeInvalid, frame_properties, encode_params.release(), nullptr);
- if (frame_properties) {
- CFRelease(frame_properties);
- }
- if (pixel_buffer) {
- CVBufferRelease(pixel_buffer);
- }
- if (status != noErr) {
- LOG(LS_ERROR) << "Failed to encode frame with code: " << status;
- return WEBRTC_VIDEO_CODEC_ERROR;
- }
- return WEBRTC_VIDEO_CODEC_OK;
-}
-
-int H264VideoToolboxEncoder::RegisterEncodeCompleteCallback(
- EncodedImageCallback* callback) {
- callback_ = callback;
- return WEBRTC_VIDEO_CODEC_OK;
-}
-
-int H264VideoToolboxEncoder::SetChannelParameters(uint32_t packet_loss,
- int64_t rtt) {
- // Encoder doesn't know anything about packet loss or rtt so just return.
- return WEBRTC_VIDEO_CODEC_OK;
-}
-
-int H264VideoToolboxEncoder::SetRates(uint32_t new_bitrate_kbit,
- uint32_t frame_rate) {
- target_bitrate_bps_ = 1000 * new_bitrate_kbit;
- bitrate_adjuster_.SetTargetBitrateBps(target_bitrate_bps_);
- SetBitrateBps(bitrate_adjuster_.GetAdjustedBitrateBps());
- return WEBRTC_VIDEO_CODEC_OK;
-}
-
-int H264VideoToolboxEncoder::Release() {
- // Need to reset so that the session is invalidated and won't use the
- // callback anymore. Do not remove callback until the session is invalidated
- // since async encoder callbacks can occur until invalidation.
- int ret = ResetCompressionSession();
- callback_ = nullptr;
- return ret;
-}
-
-int H264VideoToolboxEncoder::ResetCompressionSession() {
- DestroyCompressionSession();
-
- // Set source image buffer attributes. These attributes will be present on
- // buffers retrieved from the encoder's pixel buffer pool.
- const size_t attributes_size = 3;
- CFTypeRef keys[attributes_size] = {
-#if defined(WEBRTC_IOS)
- kCVPixelBufferOpenGLESCompatibilityKey,
-#elif defined(WEBRTC_MAC)
- kCVPixelBufferOpenGLCompatibilityKey,
-#endif
- kCVPixelBufferIOSurfacePropertiesKey,
- kCVPixelBufferPixelFormatTypeKey
- };
- CFDictionaryRef io_surface_value =
- internal::CreateCFDictionary(nullptr, nullptr, 0);
- int64_t nv12type = kCVPixelFormatType_420YpCbCr8BiPlanarFullRange;
- CFNumberRef pixel_format =
- CFNumberCreate(nullptr, kCFNumberLongType, &nv12type);
- CFTypeRef values[attributes_size] = {kCFBooleanTrue, io_surface_value,
- pixel_format};
- CFDictionaryRef source_attributes =
- internal::CreateCFDictionary(keys, values, attributes_size);
- if (io_surface_value) {
- CFRelease(io_surface_value);
- io_surface_value = nullptr;
- }
- if (pixel_format) {
- CFRelease(pixel_format);
- pixel_format = nullptr;
- }
- OSStatus status = VTCompressionSessionCreate(
- nullptr, // use default allocator
- width_, height_, kCMVideoCodecType_H264,
- nullptr, // use default encoder
- source_attributes,
- nullptr, // use default compressed data allocator
- internal::VTCompressionOutputCallback, this, &compression_session_);
- if (source_attributes) {
- CFRelease(source_attributes);
- source_attributes = nullptr;
- }
- if (status != noErr) {
- LOG(LS_ERROR) << "Failed to create compression session: " << status;
- return WEBRTC_VIDEO_CODEC_ERROR;
- }
- ConfigureCompressionSession();
- return WEBRTC_VIDEO_CODEC_OK;
-}
-
-void H264VideoToolboxEncoder::ConfigureCompressionSession() {
- RTC_DCHECK(compression_session_);
- internal::SetVTSessionProperty(compression_session_,
- kVTCompressionPropertyKey_RealTime, true);
- internal::SetVTSessionProperty(compression_session_,
- kVTCompressionPropertyKey_ProfileLevel,
- profile_);
- internal::SetVTSessionProperty(compression_session_,
- kVTCompressionPropertyKey_AllowFrameReordering,
- false);
- SetEncoderBitrateBps(target_bitrate_bps_);
- // TODO(tkchin): Look at entropy mode and colorspace matrices.
- // TODO(tkchin): Investigate to see if there's any way to make this work.
- // May need it to interop with Android. Currently this call just fails.
- // On inspecting encoder output on iOS8, this value is set to 6.
- // internal::SetVTSessionProperty(compression_session_,
- // kVTCompressionPropertyKey_MaxFrameDelayCount,
- // 1);
-
- // Set a relatively large value for keyframe emission (7200 frames or
- // 4 minutes).
- internal::SetVTSessionProperty(
- compression_session_,
- kVTCompressionPropertyKey_MaxKeyFrameInterval, 7200);
- internal::SetVTSessionProperty(
- compression_session_,
- kVTCompressionPropertyKey_MaxKeyFrameIntervalDuration, 240);
-}
-
-void H264VideoToolboxEncoder::DestroyCompressionSession() {
- if (compression_session_) {
- VTCompressionSessionInvalidate(compression_session_);
- CFRelease(compression_session_);
- compression_session_ = nullptr;
- }
-}
-
-const char* H264VideoToolboxEncoder::ImplementationName() const {
- return "VideoToolbox";
-}
-
-bool H264VideoToolboxEncoder::SupportsNativeHandle() const {
- return true;
-}
-
-void H264VideoToolboxEncoder::SetBitrateBps(uint32_t bitrate_bps) {
- if (encoder_bitrate_bps_ != bitrate_bps) {
- SetEncoderBitrateBps(bitrate_bps);
- }
-}
-
-void H264VideoToolboxEncoder::SetEncoderBitrateBps(uint32_t bitrate_bps) {
- if (compression_session_) {
- internal::SetVTSessionProperty(compression_session_,
- kVTCompressionPropertyKey_AverageBitRate,
- bitrate_bps);
-
- // TODO(tkchin): Add a helper method to set array value.
- int64_t data_limit_bytes_per_second_value = static_cast<int64_t>(
- bitrate_bps * internal::kLimitToAverageBitRateFactor / 8);
- CFNumberRef bytes_per_second =
- CFNumberCreate(kCFAllocatorDefault,
- kCFNumberSInt64Type,
- &data_limit_bytes_per_second_value);
- int64_t one_second_value = 1;
- CFNumberRef one_second =
- CFNumberCreate(kCFAllocatorDefault,
- kCFNumberSInt64Type,
- &one_second_value);
- const void* nums[2] = { bytes_per_second, one_second };
- CFArrayRef data_rate_limits =
- CFArrayCreate(nullptr, nums, 2, &kCFTypeArrayCallBacks);
- OSStatus status =
- VTSessionSetProperty(compression_session_,
- kVTCompressionPropertyKey_DataRateLimits,
- data_rate_limits);
- if (bytes_per_second) {
- CFRelease(bytes_per_second);
- }
- if (one_second) {
- CFRelease(one_second);
- }
- if (data_rate_limits) {
- CFRelease(data_rate_limits);
- }
- if (status != noErr) {
- LOG(LS_ERROR) << "Failed to set data rate limit";
- }
-
- encoder_bitrate_bps_ = bitrate_bps;
- }
-}
-
-void H264VideoToolboxEncoder::OnEncodedFrame(
- OSStatus status,
- VTEncodeInfoFlags info_flags,
- CMSampleBufferRef sample_buffer,
- CodecSpecificInfo codec_specific_info,
- int32_t width,
- int32_t height,
- int64_t render_time_ms,
- uint32_t timestamp,
- VideoRotation rotation) {
- if (status != noErr) {
- LOG(LS_ERROR) << "H264 encode failed.";
- return;
- }
- if (info_flags & kVTEncodeInfo_FrameDropped) {
- LOG(LS_INFO) << "H264 encode dropped frame.";
- return;
- }
-
- bool is_keyframe = false;
- CFArrayRef attachments =
- CMSampleBufferGetSampleAttachmentsArray(sample_buffer, 0);
- if (attachments != nullptr && CFArrayGetCount(attachments)) {
- CFDictionaryRef attachment =
- static_cast<CFDictionaryRef>(CFArrayGetValueAtIndex(attachments, 0));
- is_keyframe =
- !CFDictionaryContainsKey(attachment, kCMSampleAttachmentKey_NotSync);
- }
-
- if (is_keyframe) {
- LOG(LS_INFO) << "Generated keyframe";
- }
-
- // Convert the sample buffer into a buffer suitable for RTP packetization.
- // TODO(tkchin): Allocate buffers through a pool.
- std::unique_ptr<rtc::Buffer> buffer(new rtc::Buffer());
- std::unique_ptr<webrtc::RTPFragmentationHeader> header;
- {
- webrtc::RTPFragmentationHeader* header_raw;
- bool result = H264CMSampleBufferToAnnexBBuffer(sample_buffer, is_keyframe,
- buffer.get(), &header_raw);
- header.reset(header_raw);
- if (!result) {
- return;
- }
- }
- webrtc::EncodedImage frame(buffer->data(), buffer->size(), buffer->size());
- frame._encodedWidth = width;
- frame._encodedHeight = height;
- frame._completeFrame = true;
- frame._frameType =
- is_keyframe ? webrtc::kVideoFrameKey : webrtc::kVideoFrameDelta;
- frame.capture_time_ms_ = render_time_ms;
- frame._timeStamp = timestamp;
- frame.rotation_ = rotation;
-
- frame.content_type_ =
- (mode_ == kScreensharing) ? VideoContentType::SCREENSHARE : VideoContentType::UNSPECIFIED;
-
- h264_bitstream_parser_.ParseBitstream(buffer->data(), buffer->size());
- h264_bitstream_parser_.GetLastSliceQp(&frame.qp_);
-
- EncodedImageCallback::Result res =
- callback_->OnEncodedImage(frame, &codec_specific_info, header.get());
- if (res.error != EncodedImageCallback::Result::OK) {
- LOG(LS_ERROR) << "Encode callback failed: " << res.error;
- return;
- }
- bitrate_adjuster_.Update(frame._length);
-}
-
-VideoEncoder::ScalingSettings H264VideoToolboxEncoder::GetScalingSettings()
- const {
- return VideoEncoder::ScalingSettings(true, internal::kLowH264QpThreshold,
- internal::kHighH264QpThreshold);
-}
-} // namespace webrtc

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