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/*
* Copyright (c) 2020 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 "modules/video_coding/codecs/av1/libaom_av1_encoder.h"
#include <stddef.h>
#include <stdint.h>
#include <memory>
#include <utility>
#include <vector>
#include "absl/algorithm/container.h"
#include "api/scoped_refptr.h"
#include "api/video/encoded_image.h"
#include "api/video/i420_buffer.h"
#include "api/video/video_frame.h"
#include "api/video_codecs/video_codec.h"
#include "api/video_codecs/video_encoder.h"
#include "modules/video_coding/codecs/av1/scalable_video_controller.h"
#include "modules/video_coding/codecs/av1/scalable_video_controller_no_layering.h"
#include "modules/video_coding/include/video_codec_interface.h"
#include "modules/video_coding/include/video_error_codes.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "third_party/libaom/source/libaom/aom/aom_codec.h"
#include "third_party/libaom/source/libaom/aom/aom_encoder.h"
#include "third_party/libaom/source/libaom/aom/aomcx.h"
namespace webrtc {
namespace {
// Encoder configuration parameters
constexpr int kQpMax = 56;
constexpr int kQpMin = 10;
constexpr int kDefaultEncSpeed = 7; // Use values 6, 7, or 8 for RTC.
constexpr int kUsageProfile = 1; // 0 = good quality; 1 = real-time.
constexpr int kMinQindex = 58; // Min qindex threshold for QP scaling.
constexpr int kMaxQindex = 180; // Max qindex threshold for QP scaling.
constexpr int kBitDepth = 8;
constexpr int kLagInFrames = 0; // No look ahead.
constexpr int kRtpTicksPerSecond = 90000;
constexpr float kMinimumFrameRate = 1.0;
class LibaomAv1Encoder final : public VideoEncoder {
public:
explicit LibaomAv1Encoder(
std::unique_ptr<ScalableVideoController> svc_controller);
~LibaomAv1Encoder();
int InitEncode(const VideoCodec* codec_settings,
const Settings& settings) override;
int32_t RegisterEncodeCompleteCallback(
EncodedImageCallback* encoded_image_callback) override;
int32_t Release() override;
int32_t Encode(const VideoFrame& frame,
const std::vector<VideoFrameType>* frame_types) override;
void SetRates(const RateControlParameters& parameters) override;
EncoderInfo GetEncoderInfo() const override;
private:
const std::unique_ptr<ScalableVideoController> svc_controller_;
bool inited_;
bool keyframe_required_;
VideoCodec encoder_settings_;
aom_image_t* frame_for_encode_;
aom_codec_ctx_t ctx_;
aom_codec_enc_cfg_t cfg_;
EncodedImageCallback* encoded_image_callback_;
};
int32_t VerifyCodecSettings(const VideoCodec& codec_settings) {
if (codec_settings.width < 1) {
return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
}
if (codec_settings.height < 1) {
return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
}
// maxBitrate == 0 represents an unspecified maxBitRate.
if (codec_settings.maxBitrate > 0 &&
codec_settings.minBitrate > codec_settings.maxBitrate) {
return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
}
if (codec_settings.maxBitrate > 0 &&
codec_settings.startBitrate > codec_settings.maxBitrate) {
return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
}
if (codec_settings.startBitrate < codec_settings.minBitrate) {
return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
}
if (codec_settings.maxFramerate < 1) {
return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
}
return WEBRTC_VIDEO_CODEC_OK;
}
LibaomAv1Encoder::LibaomAv1Encoder(
std::unique_ptr<ScalableVideoController> svc_controller)
: svc_controller_(std::move(svc_controller)),
inited_(false),
keyframe_required_(true),
frame_for_encode_(nullptr),
encoded_image_callback_(nullptr) {
RTC_DCHECK(svc_controller_);
}
LibaomAv1Encoder::~LibaomAv1Encoder() {
Release();
}
int LibaomAv1Encoder::InitEncode(const VideoCodec* codec_settings,
const Settings& settings) {
if (codec_settings == nullptr) {
RTC_LOG(LS_WARNING) << "No codec settings provided to "
"LibaomAv1Encoder.";
return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
}
if (settings.number_of_cores < 1) {
return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
}
if (inited_) {
RTC_LOG(LS_WARNING) << "Initing LibaomAv1Encoder without first releasing.";
Release();
}
encoder_settings_ = *codec_settings;
// Sanity checks for encoder configuration.
const int32_t result = VerifyCodecSettings(encoder_settings_);
if (result < 0) {
RTC_LOG(LS_WARNING) << "Incorrect codec settings provided to "
"LibaomAv1Encoder.";
return result;
}
// Initialize encoder configuration structure with default values
aom_codec_err_t ret =
aom_codec_enc_config_default(aom_codec_av1_cx(), &cfg_, 0);
if (ret != AOM_CODEC_OK) {
RTC_LOG(LS_WARNING) << "LibaomAv1Encoder::EncodeInit returned " << ret
<< " on aom_codec_enc_config_default.";
return WEBRTC_VIDEO_CODEC_ERROR;
}
// Overwrite default config with input encoder settings & RTC-relevant values.
cfg_.g_w = encoder_settings_.width;
cfg_.g_h = encoder_settings_.height;
cfg_.g_threads = settings.number_of_cores;
cfg_.g_timebase.num = 1;
cfg_.g_timebase.den = kRtpTicksPerSecond;
cfg_.rc_target_bitrate = encoder_settings_.maxBitrate; // kilobits/sec.
cfg_.g_input_bit_depth = kBitDepth;
cfg_.kf_mode = AOM_KF_DISABLED;
cfg_.rc_min_quantizer = kQpMin;
cfg_.rc_max_quantizer = kQpMax;
cfg_.g_usage = kUsageProfile;
// Low-latency settings.
cfg_.rc_end_usage = AOM_CBR; // Constant Bit Rate (CBR) mode
cfg_.g_pass = AOM_RC_ONE_PASS; // One-pass rate control
cfg_.g_lag_in_frames = kLagInFrames; // No look ahead when lag equals 0.
// Creating a wrapper to the image - setting image data to nullptr. Actual
// pointer will be set in encode. Setting align to 1, as it is meaningless
// (actual memory is not allocated).
frame_for_encode_ =
aom_img_alloc(nullptr, AOM_IMG_FMT_I420, cfg_.g_w, cfg_.g_h, 1);
// Flag options: AOM_CODEC_USE_PSNR and AOM_CODEC_USE_HIGHBITDEPTH
aom_codec_flags_t flags = 0;
// Initialize an encoder instance.
ret = aom_codec_enc_init(&ctx_, aom_codec_av1_cx(), &cfg_, flags);
if (ret != AOM_CODEC_OK) {
RTC_LOG(LS_WARNING) << "LibaomAv1Encoder::EncodeInit returned " << ret
<< " on aom_codec_enc_init.";
return WEBRTC_VIDEO_CODEC_ERROR;
}
inited_ = true;
// Set control parameters
ret = aom_codec_control(&ctx_, AOME_SET_CPUUSED, kDefaultEncSpeed);
if (ret != AOM_CODEC_OK) {
RTC_LOG(LS_WARNING) << "LibaomAv1Encoder::EncodeInit returned " << ret
<< " on control AV1E_SET_CPUUSED.";
return WEBRTC_VIDEO_CODEC_ERROR;
}
ret = aom_codec_control(&ctx_, AV1E_SET_ENABLE_TPL_MODEL, 0);
if (ret != AOM_CODEC_OK) {
RTC_LOG(LS_WARNING) << "LibaomAv1Encoder::EncodeInit returned " << ret
<< " on control AV1E_SET_ENABLE_TPL_MODEL.";
return WEBRTC_VIDEO_CODEC_ERROR;
}
ret = aom_codec_control(&ctx_, AV1E_SET_DELTAQ_MODE, 0);
if (ret != AOM_CODEC_OK) {
RTC_LOG(LS_WARNING) << "LibaomAv1Encoder::EncodeInit returned " << ret
<< " on control AV1E_SET_DELTAQ_MODE.";
return WEBRTC_VIDEO_CODEC_ERROR;
}
ret = aom_codec_control(&ctx_, AV1E_SET_AQ_MODE, 3);
if (ret != AOM_CODEC_OK) {
RTC_LOG(LS_WARNING) << "LibaomAv1Encoder::EncodeInit returned " << ret
<< " on control AV1E_SET_AQ_MODE.";
return WEBRTC_VIDEO_CODEC_ERROR;
}
ScalableVideoController::StreamLayersConfig svc_config =
svc_controller_->StreamConfig();
// TODO(danilchap): Configure SVC.
(void)svc_config;
return WEBRTC_VIDEO_CODEC_OK;
}
int32_t LibaomAv1Encoder::RegisterEncodeCompleteCallback(
EncodedImageCallback* encoded_image_callback) {
encoded_image_callback_ = encoded_image_callback;
return WEBRTC_VIDEO_CODEC_OK;
}
int32_t LibaomAv1Encoder::Release() {
if (frame_for_encode_ != nullptr) {
aom_img_free(frame_for_encode_);
frame_for_encode_ = nullptr;
}
if (inited_) {
if (aom_codec_destroy(&ctx_)) {
return WEBRTC_VIDEO_CODEC_MEMORY;
}
inited_ = false;
}
return WEBRTC_VIDEO_CODEC_OK;
}
int32_t LibaomAv1Encoder::Encode(
const VideoFrame& frame,
const std::vector<VideoFrameType>* frame_types) {
if (!inited_ || encoded_image_callback_ == nullptr) {
return WEBRTC_VIDEO_CODEC_UNINITIALIZED;
}
keyframe_required_ =
frame_types != nullptr &&
absl::c_linear_search(*frame_types, VideoFrameType::kVideoFrameKey);
std::vector<ScalableVideoController::LayerFrameConfig> layer_frames =
svc_controller_->NextFrameConfig(keyframe_required_);
if (layer_frames.empty()) {
RTC_LOG(LS_ERROR) << "SVCController returned no configuration for a frame.";
return WEBRTC_VIDEO_CODEC_ERROR;
}
// Convert input frame to I420, if needed.
VideoFrame prepped_input_frame = frame;
if (prepped_input_frame.video_frame_buffer()->type() !=
VideoFrameBuffer::Type::kI420) {
rtc::scoped_refptr<I420BufferInterface> converted_buffer(
prepped_input_frame.video_frame_buffer()->ToI420());
prepped_input_frame = VideoFrame(converted_buffer, frame.timestamp(),
frame.render_time_ms(), frame.rotation());
}
// Set frame_for_encode_ data pointers and strides.
auto i420_buffer = prepped_input_frame.video_frame_buffer()->GetI420();
frame_for_encode_->planes[AOM_PLANE_Y] =
const_cast<unsigned char*>(i420_buffer->DataY());
frame_for_encode_->planes[AOM_PLANE_U] =
const_cast<unsigned char*>(i420_buffer->DataU());
frame_for_encode_->planes[AOM_PLANE_V] =
const_cast<unsigned char*>(i420_buffer->DataV());
frame_for_encode_->stride[AOM_PLANE_Y] = i420_buffer->StrideY();
frame_for_encode_->stride[AOM_PLANE_U] = i420_buffer->StrideU();
frame_for_encode_->stride[AOM_PLANE_V] = i420_buffer->StrideV();
const uint32_t duration =
kRtpTicksPerSecond / static_cast<float>(encoder_settings_.maxFramerate);
// TODO(danilchap): Remove this checks when layering is implemented.
RTC_DCHECK_EQ(layer_frames.size(), 1);
for (ScalableVideoController::LayerFrameConfig& layer_frame : layer_frames) {
aom_enc_frame_flags_t flags =
layer_frame.is_keyframe ? AOM_EFLAG_FORCE_KF : 0;
// TODO(danilchap): configure buffers and layers based on
// `layer_frame.buffers` when layering is enabled.
// Encode a frame.
aom_codec_err_t ret = aom_codec_encode(&ctx_, frame_for_encode_,
frame.timestamp(), duration, flags);
if (ret != AOM_CODEC_OK) {
RTC_LOG(LS_WARNING) << "LibaomAv1Encoder::Encode returned " << ret
<< " on aom_codec_encode.";
return WEBRTC_VIDEO_CODEC_ERROR;
}
// Get encoded image data.
EncodedImage encoded_image;
encoded_image._completeFrame = true;
aom_codec_iter_t iter = nullptr;
int data_pkt_count = 0;
while (const aom_codec_cx_pkt_t* pkt =
aom_codec_get_cx_data(&ctx_, &iter)) {
if (pkt->kind == AOM_CODEC_CX_FRAME_PKT && pkt->data.frame.sz > 0) {
if (data_pkt_count > 0) {
RTC_LOG(LS_WARNING) << "LibaomAv1Encoder::Encoder returned more than "
"one data packet for an input video frame.";
Release();
}
// TODO(bugs.webrtc.org/11174): Remove this hack when
// webrtc_pc_e2e::SingleProcessEncodedImageDataInjector not used or
// fixed not to assume that encoded image transfered as is.
const uint8_t* data = static_cast<const uint8_t*>(pkt->data.frame.buf);
size_t size = pkt->data.frame.sz;
if (size > 2 && data[0] == 0b0'0010'010 && data[1] == 0) {
// Typically frame starts with a Temporal Delimter OBU of size 0 that
// is not need by any component in webrtc and discarded during rtp
// packetization. Before discarded it confuses test framework that
// assumes received encoded frame is exactly same as sent frame.
data += 2;
size -= 2;
}
encoded_image.SetEncodedData(EncodedImageBuffer::Create(data, size));
layer_frame.is_keyframe =
((pkt->data.frame.flags & AOM_EFLAG_FORCE_KF) != 0);
encoded_image._frameType = layer_frame.is_keyframe
? VideoFrameType::kVideoFrameKey
: VideoFrameType::kVideoFrameDelta;
encoded_image.SetTimestamp(frame.timestamp());
encoded_image.capture_time_ms_ = frame.render_time_ms();
encoded_image.rotation_ = frame.rotation();
encoded_image.content_type_ = VideoContentType::UNSPECIFIED;
// If encoded image width/height info are added to aom_codec_cx_pkt_t,
// use those values in lieu of the values in frame.
encoded_image._encodedHeight = frame.height();
encoded_image._encodedWidth = frame.width();
encoded_image.timing_.flags = VideoSendTiming::kInvalid;
int qp = -1;
ret = aom_codec_control(&ctx_, AOME_GET_LAST_QUANTIZER, &qp);
if (ret != AOM_CODEC_OK) {
RTC_LOG(LS_WARNING) << "LibaomAv1Encoder::Encode returned " << ret
<< " on control AOME_GET_LAST_QUANTIZER.";
return WEBRTC_VIDEO_CODEC_ERROR;
}
encoded_image.qp_ = qp;
encoded_image.SetColorSpace(frame.color_space());
++data_pkt_count;
}
}
// Deliver encoded image data.
if (encoded_image.size() > 0) {
CodecSpecificInfo codec_specific_info;
codec_specific_info.codecType = kVideoCodecAV1;
bool is_keyframe = layer_frame.is_keyframe;
codec_specific_info.generic_frame_info =
svc_controller_->OnEncodeDone(std::move(layer_frame));
if (is_keyframe && codec_specific_info.generic_frame_info) {
codec_specific_info.template_structure =
svc_controller_->DependencyStructure();
}
encoded_image_callback_->OnEncodedImage(encoded_image,
&codec_specific_info, nullptr);
}
}
return WEBRTC_VIDEO_CODEC_OK;
}
void LibaomAv1Encoder::SetRates(const RateControlParameters& parameters) {
if (!inited_) {
RTC_LOG(LS_WARNING) << "SetRates() while encoder is not initialized";
return;
}
if (parameters.framerate_fps < kMinimumFrameRate) {
RTC_LOG(LS_WARNING) << "Unsupported framerate (must be >= "
<< kMinimumFrameRate
<< " ): " << parameters.framerate_fps;
return;
}
if (parameters.bitrate.get_sum_bps() == 0) {
RTC_LOG(LS_WARNING) << "Attempt to set target bit rate to zero";
return;
}
// Check input target bit rate value.
uint32_t rc_target_bitrate_kbps = parameters.bitrate.get_sum_kbps();
if (encoder_settings_.maxBitrate > 0)
RTC_DCHECK_LE(rc_target_bitrate_kbps, encoder_settings_.maxBitrate);
RTC_DCHECK_GE(rc_target_bitrate_kbps, encoder_settings_.minBitrate);
// Set target bit rate.
cfg_.rc_target_bitrate = rc_target_bitrate_kbps;
// Set frame rate to closest integer value.
encoder_settings_.maxFramerate =
static_cast<uint32_t>(parameters.framerate_fps + 0.5);
// Update encoder context.
aom_codec_err_t error_code = aom_codec_enc_config_set(&ctx_, &cfg_);
if (error_code != AOM_CODEC_OK) {
RTC_LOG(LS_WARNING) << "Error configuring encoder, error code: "
<< error_code;
}
}
VideoEncoder::EncoderInfo LibaomAv1Encoder::GetEncoderInfo() const {
EncoderInfo info;
info.supports_native_handle = false;
info.implementation_name = "libaom";
info.has_trusted_rate_controller = true;
info.is_hardware_accelerated = false;
info.scaling_settings = VideoEncoder::ScalingSettings(kMinQindex, kMaxQindex);
return info;
}
} // namespace
const bool kIsLibaomAv1EncoderSupported = true;
std::unique_ptr<VideoEncoder> CreateLibaomAv1Encoder() {
return std::make_unique<LibaomAv1Encoder>(
std::make_unique<ScalableVideoControllerNoLayering>());
}
std::unique_ptr<VideoEncoder> CreateLibaomAv1Encoder(
std::unique_ptr<ScalableVideoController> svc_controller) {
return std::make_unique<LibaomAv1Encoder>(std::move(svc_controller));
}
} // namespace webrtc