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webrtc/modules/video_coding/codecs/vp8/libvpx_vp8_encoder.cc
Erik Språng dbdd8395f7 Add ability for VideoEncoder to signal frame rate allocation. 
This CL add new data to the VideoEncoder::EncoderInfo struct, indicating
how the encoder intends to allocate frames across spatial and temporal
layers.

This metadata will be used in upcoming CLs to control how the encoder's
rate controller performs.

Bug: webrtc:10155
Change-Id: Id56fae04bae5f230d1a985171097d7ca83a3be8a
Reviewed-on: https://webrtc-review.googlesource.com/c/117900
Reviewed-by: Niels Moller <nisse@webrtc.org>
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Commit-Queue: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26300}
2019-01-17 15:40:53 +00:00

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/*
* Copyright (c) 2012 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 <assert.h>
#include <string.h>
#include <algorithm>
#include <cstdint>
#include <string>
#include <utility>
#include <vector>
#include "absl/memory/memory.h"
#include "api/video/video_content_type.h"
#include "api/video/video_frame_buffer.h"
#include "api/video/video_timing.h"
#include "api/video_codecs/create_vp8_temporal_layers.h"
#include "api/video_codecs/vp8_temporal_layers.h"
#include "common_video/libyuv/include/webrtc_libyuv.h"
#include "modules/video_coding/codecs/interface/common_constants.h"
#include "modules/video_coding/codecs/vp8/include/vp8.h"
#include "modules/video_coding/codecs/vp8/libvpx_vp8_encoder.h"
#include "modules/video_coding/include/video_error_codes.h"
#include "modules/video_coding/utility/simulcast_rate_allocator.h"
#include "modules/video_coding/utility/simulcast_utility.h"
#include "rtc_base/checks.h"
#include "rtc_base/experiments/field_trial_parser.h"
#include "rtc_base/scoped_ref_ptr.h"
#include "rtc_base/trace_event.h"
#include "system_wrappers/include/field_trial.h"
#include "third_party/libyuv/include/libyuv/scale.h"
#include "vpx/vp8cx.h"
namespace webrtc {
namespace {
const char kVp8TrustedRateControllerFieldTrial[] =
"WebRTC-LibvpxVp8TrustedRateController";
#if defined(WEBRTC_IOS)
const char kVP8IosMaxNumberOfThreadFieldTrial[] =
"WebRTC-VP8IosMaxNumberOfThread";
const char kVP8IosMaxNumberOfThreadFieldTrialParameter[] = "max_thread";
#endif
// QP is obtained from VP8-bitstream for HW, so the QP corresponds to the
// bitstream range of [0, 127] and not the user-level range of [0,63].
constexpr int kLowVp8QpThreshold = 29;
constexpr int kHighVp8QpThreshold = 95;
constexpr int kTokenPartitions = VP8_ONE_TOKENPARTITION;
constexpr uint32_t kVp832ByteAlign = 32u;
// VP8 denoiser states.
enum denoiserState : uint32_t {
kDenoiserOff,
kDenoiserOnYOnly,
kDenoiserOnYUV,
kDenoiserOnYUVAggressive,
// Adaptive mode defaults to kDenoiserOnYUV on key frame, but may switch
// to kDenoiserOnYUVAggressive based on a computed noise metric.
kDenoiserOnAdaptive
};
// Greatest common divisior
static int GCD(int a, int b) {
int c = a % b;
while (c != 0) {
a = b;
b = c;
c = a % b;
}
return b;
}
static_assert(Vp8EncoderConfig::kMaxPeriodicity == VPX_TS_MAX_PERIODICITY,
"Vp8EncoderConfig::kMaxPeriodicity must be kept in sync with the "
"constant in libvpx.");
static_assert(Vp8EncoderConfig::kMaxLayers == VPX_TS_MAX_LAYERS,
"Vp8EncoderConfig::kMaxLayers must be kept in sync with the "
"constant in libvpx.");
static Vp8EncoderConfig GetEncoderConfig(vpx_codec_enc_cfg* vpx_config) {
Vp8EncoderConfig config;
config.ts_number_layers = vpx_config->ts_number_layers;
memcpy(config.ts_target_bitrate, vpx_config->ts_target_bitrate,
sizeof(unsigned int) * Vp8EncoderConfig::kMaxLayers);
memcpy(config.ts_rate_decimator, vpx_config->ts_rate_decimator,
sizeof(unsigned int) * Vp8EncoderConfig::kMaxLayers);
config.ts_periodicity = vpx_config->ts_periodicity;
memcpy(config.ts_layer_id, vpx_config->ts_layer_id,
sizeof(unsigned int) * Vp8EncoderConfig::kMaxPeriodicity);
config.rc_target_bitrate = vpx_config->rc_target_bitrate;
config.rc_min_quantizer = vpx_config->rc_min_quantizer;
config.rc_max_quantizer = vpx_config->rc_max_quantizer;
return config;
}
static void FillInEncoderConfig(vpx_codec_enc_cfg* vpx_config,
const Vp8EncoderConfig& config) {
vpx_config->ts_number_layers = config.ts_number_layers;
memcpy(vpx_config->ts_target_bitrate, config.ts_target_bitrate,
sizeof(unsigned int) * Vp8EncoderConfig::kMaxLayers);
memcpy(vpx_config->ts_rate_decimator, config.ts_rate_decimator,
sizeof(unsigned int) * Vp8EncoderConfig::kMaxLayers);
vpx_config->ts_periodicity = config.ts_periodicity;
memcpy(vpx_config->ts_layer_id, config.ts_layer_id,
sizeof(unsigned int) * Vp8EncoderConfig::kMaxPeriodicity);
vpx_config->rc_target_bitrate = config.rc_target_bitrate;
vpx_config->rc_min_quantizer = config.rc_min_quantizer;
vpx_config->rc_max_quantizer = config.rc_max_quantizer;
}
bool UpdateVpxConfiguration(Vp8TemporalLayers* temporal_layers,
vpx_codec_enc_cfg_t* cfg) {
Vp8EncoderConfig config = GetEncoderConfig(cfg);
const bool res = temporal_layers->UpdateConfiguration(&config);
if (res)
FillInEncoderConfig(cfg, config);
return res;
}
} // namespace
std::unique_ptr<VideoEncoder> VP8Encoder::Create() {
return absl::make_unique<LibvpxVp8Encoder>();
}
vpx_enc_frame_flags_t LibvpxVp8Encoder::EncodeFlags(
const Vp8TemporalLayers::FrameConfig& references) {
RTC_DCHECK(!references.drop_frame);
vpx_enc_frame_flags_t flags = 0;
if ((references.last_buffer_flags & Vp8TemporalLayers::kReference) == 0)
flags |= VP8_EFLAG_NO_REF_LAST;
if ((references.last_buffer_flags & Vp8TemporalLayers::kUpdate) == 0)
flags |= VP8_EFLAG_NO_UPD_LAST;
if ((references.golden_buffer_flags & Vp8TemporalLayers::kReference) == 0)
flags |= VP8_EFLAG_NO_REF_GF;
if ((references.golden_buffer_flags & Vp8TemporalLayers::kUpdate) == 0)
flags |= VP8_EFLAG_NO_UPD_GF;
if ((references.arf_buffer_flags & Vp8TemporalLayers::kReference) == 0)
flags |= VP8_EFLAG_NO_REF_ARF;
if ((references.arf_buffer_flags & Vp8TemporalLayers::kUpdate) == 0)
flags |= VP8_EFLAG_NO_UPD_ARF;
if (references.freeze_entropy)
flags |= VP8_EFLAG_NO_UPD_ENTROPY;
return flags;
}
LibvpxVp8Encoder::LibvpxVp8Encoder()
: LibvpxVp8Encoder(LibvpxInterface::CreateEncoder()) {}
LibvpxVp8Encoder::LibvpxVp8Encoder(std::unique_ptr<LibvpxInterface> interface)
: libvpx_(std::move(interface)),
experimental_cpu_speed_config_arm_(CpuSpeedExperiment::GetConfigs()),
trusted_rate_controller_(
field_trial::IsEnabled(kVp8TrustedRateControllerFieldTrial)),
encoded_complete_callback_(nullptr),
inited_(false),
timestamp_(0),
qp_max_(56), // Setting for max quantizer.
cpu_speed_default_(-6),
number_of_cores_(0),
rc_max_intra_target_(0),
key_frame_request_(kMaxSimulcastStreams, false) {
temporal_layers_.reserve(kMaxSimulcastStreams);
raw_images_.reserve(kMaxSimulcastStreams);
encoded_images_.reserve(kMaxSimulcastStreams);
send_stream_.reserve(kMaxSimulcastStreams);
cpu_speed_.assign(kMaxSimulcastStreams, cpu_speed_default_);
encoders_.reserve(kMaxSimulcastStreams);
configurations_.reserve(kMaxSimulcastStreams);
downsampling_factors_.reserve(kMaxSimulcastStreams);
}
LibvpxVp8Encoder::~LibvpxVp8Encoder() {
Release();
}
int LibvpxVp8Encoder::Release() {
int ret_val = WEBRTC_VIDEO_CODEC_OK;
while (!encoded_images_.empty()) {
EncodedImage& image = encoded_images_.back();
delete[] image.data();
encoded_images_.pop_back();
}
while (!encoders_.empty()) {
vpx_codec_ctx_t& encoder = encoders_.back();
if (inited_) {
if (libvpx_->codec_destroy(&encoder)) {
ret_val = WEBRTC_VIDEO_CODEC_MEMORY;
}
}
encoders_.pop_back();
}
configurations_.clear();
send_stream_.clear();
cpu_speed_.clear();
while (!raw_images_.empty()) {
libvpx_->img_free(&raw_images_.back());
raw_images_.pop_back();
}
temporal_layers_.clear();
inited_ = false;
return ret_val;
}
int LibvpxVp8Encoder::SetRateAllocation(const VideoBitrateAllocation& bitrate,
uint32_t new_framerate) {
if (!inited_)
return WEBRTC_VIDEO_CODEC_UNINITIALIZED;
if (encoders_[0].err)
return WEBRTC_VIDEO_CODEC_ERROR;
if (new_framerate < 1)
return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
if (bitrate.get_sum_bps() == 0) {
// Encoder paused, turn off all encoding.
const int num_streams = static_cast<size_t>(encoders_.size());
for (int i = 0; i < num_streams; ++i)
SetStreamState(false, i);
return WEBRTC_VIDEO_CODEC_OK;
}
// At this point, bitrate allocation should already match codec settings.
if (codec_.maxBitrate > 0)
RTC_DCHECK_LE(bitrate.get_sum_kbps(), codec_.maxBitrate);
RTC_DCHECK_GE(bitrate.get_sum_kbps(), codec_.minBitrate);
if (codec_.numberOfSimulcastStreams > 0)
RTC_DCHECK_GE(bitrate.get_sum_kbps(), codec_.simulcastStream[0].minBitrate);
codec_.maxFramerate = new_framerate;
if (encoders_.size() > 1) {
// If we have more than 1 stream, reduce the qp_max for the low resolution
// stream if frame rate is not too low. The trade-off with lower qp_max is
// possibly more dropped frames, so we only do this if the frame rate is
// above some threshold (base temporal layer is down to 1/4 for 3 layers).
// We may want to condition this on bitrate later.
if (new_framerate > 20) {
configurations_[encoders_.size() - 1].rc_max_quantizer = 45;
} else {
// Go back to default value set in InitEncode.
configurations_[encoders_.size() - 1].rc_max_quantizer = qp_max_;
}
}
size_t stream_idx = encoders_.size() - 1;
for (size_t i = 0; i < encoders_.size(); ++i, --stream_idx) {
unsigned int target_bitrate_kbps =
bitrate.GetSpatialLayerSum(stream_idx) / 1000;
bool send_stream = target_bitrate_kbps > 0;
if (send_stream || encoders_.size() > 1)
SetStreamState(send_stream, stream_idx);
configurations_[i].rc_target_bitrate = target_bitrate_kbps;
if (send_stream) {
temporal_layers_[stream_idx]->OnRatesUpdated(
bitrate.GetTemporalLayerAllocation(stream_idx), new_framerate);
}
UpdateVpxConfiguration(temporal_layers_[stream_idx].get(),
&configurations_[i]);
if (libvpx_->codec_enc_config_set(&encoders_[i], &configurations_[i])) {
return WEBRTC_VIDEO_CODEC_ERROR;
}
}
return WEBRTC_VIDEO_CODEC_OK;
}
void LibvpxVp8Encoder::SetStreamState(bool send_stream, int stream_idx) {
if (send_stream && !send_stream_[stream_idx]) {
// Need a key frame if we have not sent this stream before.
key_frame_request_[stream_idx] = true;
}
send_stream_[stream_idx] = send_stream;
}
void LibvpxVp8Encoder::SetupTemporalLayers(const VideoCodec& codec) {
RTC_DCHECK(temporal_layers_.empty());
int num_streams = SimulcastUtility::NumberOfSimulcastStreams(codec);
for (int i = 0; i < num_streams; ++i) {
Vp8TemporalLayersType type;
int num_temporal_layers =
SimulcastUtility::NumberOfTemporalLayers(codec, i);
if (SimulcastUtility::IsConferenceModeScreenshare(codec) && i == 0) {
type = Vp8TemporalLayersType::kBitrateDynamic;
// Legacy screenshare layers supports max 2 layers.
num_temporal_layers = std::max<int>(2, num_temporal_layers);
} else {
type = Vp8TemporalLayersType::kFixedPattern;
}
temporal_layers_.emplace_back(
CreateVp8TemporalLayers(type, num_temporal_layers));
}
}
int LibvpxVp8Encoder::InitEncode(const VideoCodec* inst,
int number_of_cores,
size_t /*maxPayloadSize */) {
if (inst == NULL) {
return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
}
if (inst->maxFramerate < 1) {
return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
}
// allow zero to represent an unspecified maxBitRate
if (inst->maxBitrate > 0 && inst->startBitrate > inst->maxBitrate) {
return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
}
if (inst->width <= 1 || inst->height <= 1) {
return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
}
if (number_of_cores < 1) {
return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
}
if (inst->VP8().automaticResizeOn && inst->numberOfSimulcastStreams > 1) {
return WEBRTC_VIDEO_CODEC_ERR_PARAMETER;
}
int retVal = Release();
if (retVal < 0) {
return retVal;
}
int number_of_streams = SimulcastUtility::NumberOfSimulcastStreams(*inst);
if (number_of_streams > 1 &&
(!SimulcastUtility::ValidSimulcastResolutions(*inst, number_of_streams) ||
!SimulcastUtility::ValidSimulcastTemporalLayers(*inst,
number_of_streams))) {
return WEBRTC_VIDEO_CODEC_ERR_SIMULCAST_PARAMETERS_NOT_SUPPORTED;
}
SetupTemporalLayers(*inst);
number_of_cores_ = number_of_cores;
timestamp_ = 0;
codec_ = *inst;
// Code expects simulcastStream resolutions to be correct, make sure they are
// filled even when there are no simulcast layers.
if (codec_.numberOfSimulcastStreams == 0) {
codec_.simulcastStream[0].width = codec_.width;
codec_.simulcastStream[0].height = codec_.height;
}
encoded_images_.resize(number_of_streams);
encoders_.resize(number_of_streams);
configurations_.resize(number_of_streams);
downsampling_factors_.resize(number_of_streams);
raw_images_.resize(number_of_streams);
send_stream_.resize(number_of_streams);
send_stream_[0] = true; // For non-simulcast case.
cpu_speed_.resize(number_of_streams);
std::fill(key_frame_request_.begin(), key_frame_request_.end(), false);
int idx = number_of_streams - 1;
for (int i = 0; i < (number_of_streams - 1); ++i, --idx) {
int gcd = GCD(inst->simulcastStream[idx].width,
inst->simulcastStream[idx - 1].width);
downsampling_factors_[i].num = inst->simulcastStream[idx].width / gcd;
downsampling_factors_[i].den = inst->simulcastStream[idx - 1].width / gcd;
send_stream_[i] = false;
}
if (number_of_streams > 1) {
send_stream_[number_of_streams - 1] = false;
downsampling_factors_[number_of_streams - 1].num = 1;
downsampling_factors_[number_of_streams - 1].den = 1;
}
for (int i = 0; i < number_of_streams; ++i) {
// allocate memory for encoded image
if (encoded_images_[i].data() != nullptr) {
delete[] encoded_images_[i].data();
}
size_t frame_capacity =
CalcBufferSize(VideoType::kI420, codec_.width, codec_.height);
encoded_images_[i].set_buffer(new uint8_t[frame_capacity], frame_capacity);
encoded_images_[i]._completeFrame = true;
}
// populate encoder configuration with default values
if (libvpx_->codec_enc_config_default(vpx_codec_vp8_cx(), &configurations_[0],
0)) {
return WEBRTC_VIDEO_CODEC_ERROR;
}
// setting the time base of the codec
configurations_[0].g_timebase.num = 1;
configurations_[0].g_timebase.den = 90000;
configurations_[0].g_lag_in_frames = 0; // 0- no frame lagging
// Set the error resilience mode for temporal layers (but not simulcast).
configurations_[0].g_error_resilient =
(SimulcastUtility::NumberOfTemporalLayers(*inst, 0) > 1)
? VPX_ERROR_RESILIENT_DEFAULT
: 0;
// rate control settings
configurations_[0].rc_dropframe_thresh = FrameDropThreshold(0);
configurations_[0].rc_end_usage = VPX_CBR;
configurations_[0].g_pass = VPX_RC_ONE_PASS;
// Handle resizing outside of libvpx.
configurations_[0].rc_resize_allowed = 0;
configurations_[0].rc_min_quantizer = 2;
if (inst->qpMax >= configurations_[0].rc_min_quantizer) {
qp_max_ = inst->qpMax;
}
configurations_[0].rc_max_quantizer = qp_max_;
configurations_[0].rc_undershoot_pct = 100;
configurations_[0].rc_overshoot_pct = 15;
configurations_[0].rc_buf_initial_sz = 500;
configurations_[0].rc_buf_optimal_sz = 600;
configurations_[0].rc_buf_sz = 1000;
// Set the maximum target size of any key-frame.
rc_max_intra_target_ = MaxIntraTarget(configurations_[0].rc_buf_optimal_sz);
if (inst->VP8().keyFrameInterval > 0) {
configurations_[0].kf_mode = VPX_KF_AUTO;
configurations_[0].kf_max_dist = inst->VP8().keyFrameInterval;
} else {
configurations_[0].kf_mode = VPX_KF_DISABLED;
}
// Allow the user to set the complexity for the base stream.
switch (inst->VP8().complexity) {
case VideoCodecComplexity::kComplexityHigh:
cpu_speed_[0] = -5;
break;
case VideoCodecComplexity::kComplexityHigher:
cpu_speed_[0] = -4;
break;
case VideoCodecComplexity::kComplexityMax:
cpu_speed_[0] = -3;
break;
default:
cpu_speed_[0] = -6;
break;
}
cpu_speed_default_ = cpu_speed_[0];
// Set encoding complexity (cpu_speed) based on resolution and/or platform.
cpu_speed_[0] = GetCpuSpeed(inst->width, inst->height);
for (int i = 1; i < number_of_streams; ++i) {
cpu_speed_[i] =
GetCpuSpeed(inst->simulcastStream[number_of_streams - 1 - i].width,
inst->simulcastStream[number_of_streams - 1 - i].height);
}
configurations_[0].g_w = inst->width;
configurations_[0].g_h = inst->height;
// Determine number of threads based on the image size and #cores.
// TODO(fbarchard): Consider number of Simulcast layers.
configurations_[0].g_threads = NumberOfThreads(
configurations_[0].g_w, configurations_[0].g_h, number_of_cores);
// Creating a wrapper to the image - setting image data to NULL.
// Actual pointer will be set in encode. Setting align to 1, as it
// is meaningless (no memory allocation is done here).
libvpx_->img_wrap(&raw_images_[0], VPX_IMG_FMT_I420, inst->width,
inst->height, 1, NULL);
// Note the order we use is different from webm, we have lowest resolution
// at position 0 and they have highest resolution at position 0.
int stream_idx = encoders_.size() - 1;
SimulcastRateAllocator init_allocator(codec_);
VideoBitrateAllocation allocation = init_allocator.GetAllocation(
inst->startBitrate * 1000, inst->maxFramerate);
std::vector<uint32_t> stream_bitrates;
for (int i = 0; i == 0 || i < inst->numberOfSimulcastStreams; ++i) {
uint32_t bitrate = allocation.GetSpatialLayerSum(i) / 1000;
stream_bitrates.push_back(bitrate);
}
configurations_[0].rc_target_bitrate = stream_bitrates[stream_idx];
if (stream_bitrates[stream_idx] > 0) {
temporal_layers_[stream_idx]->OnRatesUpdated(
allocation.GetTemporalLayerAllocation(stream_idx), inst->maxFramerate);
}
UpdateVpxConfiguration(temporal_layers_[stream_idx].get(),
&configurations_[0]);
configurations_[0].rc_dropframe_thresh = FrameDropThreshold(stream_idx);
--stream_idx;
for (size_t i = 1; i < encoders_.size(); ++i, --stream_idx) {
memcpy(&configurations_[i], &configurations_[0],
sizeof(configurations_[0]));
configurations_[i].g_w = inst->simulcastStream[stream_idx].width;
configurations_[i].g_h = inst->simulcastStream[stream_idx].height;
// Use 1 thread for lower resolutions.
configurations_[i].g_threads = 1;
configurations_[i].rc_dropframe_thresh = FrameDropThreshold(stream_idx);
// Setting alignment to 32 - as that ensures at least 16 for all
// planes (32 for Y, 16 for U,V). Libvpx sets the requested stride for
// the y plane, but only half of it to the u and v planes.
libvpx_->img_alloc(&raw_images_[i], VPX_IMG_FMT_I420,
inst->simulcastStream[stream_idx].width,
inst->simulcastStream[stream_idx].height,
kVp832ByteAlign);
SetStreamState(stream_bitrates[stream_idx] > 0, stream_idx);
configurations_[i].rc_target_bitrate = stream_bitrates[stream_idx];
if (stream_bitrates[stream_idx] > 0) {
temporal_layers_[stream_idx]->OnRatesUpdated(
allocation.GetTemporalLayerAllocation(stream_idx),
inst->maxFramerate);
}
UpdateVpxConfiguration(temporal_layers_[stream_idx].get(),
&configurations_[i]);
}
return InitAndSetControlSettings();
}
int LibvpxVp8Encoder::GetCpuSpeed(int width, int height) {
#if defined(WEBRTC_ARCH_ARM) || defined(WEBRTC_ARCH_ARM64) || \
defined(WEBRTC_ANDROID)
// On mobile platform, use a lower speed setting for lower resolutions for
// CPUs with 4 or more cores.
RTC_DCHECK_GT(number_of_cores_, 0);
if (number_of_cores_ <= 3)
return -12;
if (experimental_cpu_speed_config_arm_) {
return CpuSpeedExperiment::GetValue(width * height,
*experimental_cpu_speed_config_arm_);
}
if (width * height <= 352 * 288)
return -8;
else if (width * height <= 640 * 480)
return -10;
else
return -12;
#else
// For non-ARM, increase encoding complexity (i.e., use lower speed setting)
// if resolution is below CIF. Otherwise, keep the default/user setting
// (|cpu_speed_default_|) set on InitEncode via VP8().complexity.
if (width * height < 352 * 288)
return (cpu_speed_default_ < -4) ? -4 : cpu_speed_default_;
else
return cpu_speed_default_;
#endif
}
int LibvpxVp8Encoder::NumberOfThreads(int width, int height, int cpus) {
#if defined(WEBRTC_ANDROID)
if (width * height >= 320 * 180) {
if (cpus >= 4) {
// 3 threads for CPUs with 4 and more cores since most of times only 4
// cores will be active.
return 3;
} else if (cpus == 3 || cpus == 2) {
return 2;
} else {
return 1;
}
}
return 1;
#else
#if defined(WEBRTC_IOS)
std::string trial_string =
field_trial::FindFullName(kVP8IosMaxNumberOfThreadFieldTrial);
FieldTrialParameter<int> max_thread_number(
kVP8IosMaxNumberOfThreadFieldTrialParameter, 0);
ParseFieldTrial({&max_thread_number}, trial_string);
if (max_thread_number.Get() > 0) {
if (width * height < 320 * 180) {
return 1; // Use single thread for small screens
}
// thread number must be less than or equal to the number of CPUs.
return std::min(cpus, max_thread_number.Get());
}
#endif // defined(WEBRTC_IOS)
if (width * height >= 1920 * 1080 && cpus > 8) {
return 8; // 8 threads for 1080p on high perf machines.
} else if (width * height > 1280 * 960 && cpus >= 6) {
// 3 threads for 1080p.
return 3;
} else if (width * height > 640 * 480 && cpus >= 3) {
// Default 2 threads for qHD/HD, but allow 3 if core count is high enough,
// as this will allow more margin for high-core/low clock machines or if
// not built with highest optimization.
if (cpus >= 6) {
return 3;
}
return 2;
} else {
// 1 thread for VGA or less.
return 1;
}
#endif
}
int LibvpxVp8Encoder::InitAndSetControlSettings() {
vpx_codec_flags_t flags = 0;
flags |= VPX_CODEC_USE_OUTPUT_PARTITION;
if (encoders_.size() > 1) {
int error = libvpx_->codec_enc_init_multi(
&encoders_[0], vpx_codec_vp8_cx(), &configurations_[0],
encoders_.size(), flags, &downsampling_factors_[0]);
if (error) {
return WEBRTC_VIDEO_CODEC_UNINITIALIZED;
}
} else {
if (libvpx_->codec_enc_init(&encoders_[0], vpx_codec_vp8_cx(),
&configurations_[0], flags)) {
return WEBRTC_VIDEO_CODEC_UNINITIALIZED;
}
}
// Enable denoising for the highest resolution stream, and for
// the second highest resolution if we are doing more than 2
// spatial layers/streams.
// TODO(holmer): Investigate possibility of adding a libvpx API
// for getting the denoised frame from the encoder and using that
// when encoding lower resolution streams. Would it work with the
// multi-res encoding feature?
denoiserState denoiser_state = kDenoiserOnYOnly;
#if defined(WEBRTC_ARCH_ARM) || defined(WEBRTC_ARCH_ARM64) || \
defined(WEBRTC_ANDROID)
denoiser_state = kDenoiserOnYOnly;
#else
denoiser_state = kDenoiserOnAdaptive;
#endif
libvpx_->codec_control(
&encoders_[0], VP8E_SET_NOISE_SENSITIVITY,
codec_.VP8()->denoisingOn ? denoiser_state : kDenoiserOff);
if (encoders_.size() > 2) {
libvpx_->codec_control(
&encoders_[1], VP8E_SET_NOISE_SENSITIVITY,
codec_.VP8()->denoisingOn ? denoiser_state : kDenoiserOff);
}
for (size_t i = 0; i < encoders_.size(); ++i) {
// Allow more screen content to be detected as static.
libvpx_->codec_control(
&(encoders_[i]), VP8E_SET_STATIC_THRESHOLD,
codec_.mode == VideoCodecMode::kScreensharing ? 300u : 1u);
libvpx_->codec_control(&(encoders_[i]), VP8E_SET_CPUUSED, cpu_speed_[i]);
libvpx_->codec_control(
&(encoders_[i]), VP8E_SET_TOKEN_PARTITIONS,
static_cast<vp8e_token_partitions>(kTokenPartitions));
libvpx_->codec_control(&(encoders_[i]), VP8E_SET_MAX_INTRA_BITRATE_PCT,
rc_max_intra_target_);
// VP8E_SET_SCREEN_CONTENT_MODE 2 = screen content with more aggressive
// rate control (drop frames on large target bitrate overshoot)
libvpx_->codec_control(
&(encoders_[i]), VP8E_SET_SCREEN_CONTENT_MODE,
codec_.mode == VideoCodecMode::kScreensharing ? 2u : 0u);
}
inited_ = true;
return WEBRTC_VIDEO_CODEC_OK;
}
uint32_t LibvpxVp8Encoder::MaxIntraTarget(uint32_t optimalBuffersize) {
// Set max to the optimal buffer level (normalized by target BR),
// and scaled by a scalePar.
// Max target size = scalePar * optimalBufferSize * targetBR[Kbps].
// This values is presented in percentage of perFrameBw:
// perFrameBw = targetBR[Kbps] * 1000 / frameRate.
// The target in % is as follows:
float scalePar = 0.5;
uint32_t targetPct = optimalBuffersize * scalePar * codec_.maxFramerate / 10;
// Don't go below 3 times the per frame bandwidth.
const uint32_t minIntraTh = 300;
return (targetPct < minIntraTh) ? minIntraTh : targetPct;
}
uint32_t LibvpxVp8Encoder::FrameDropThreshold(size_t spatial_idx) const {
bool enable_frame_dropping = codec_.VP8().frameDroppingOn;
// If temporal layers are used, they get to override the frame dropping
// setting, as eg. ScreenshareLayers does not work as intended with frame
// dropping on and DefaultTemporalLayers will have performance issues with
// frame dropping off.
if (temporal_layers_.size() <= spatial_idx) {
enable_frame_dropping =
temporal_layers_[spatial_idx]->SupportsEncoderFrameDropping();
}
return enable_frame_dropping ? 30 : 0;
}
int LibvpxVp8Encoder::Encode(const VideoFrame& frame,
const CodecSpecificInfo* codec_specific_info,
const std::vector<FrameType>* frame_types) {
RTC_DCHECK_EQ(frame.width(), codec_.width);
RTC_DCHECK_EQ(frame.height(), codec_.height);
if (!inited_)
return WEBRTC_VIDEO_CODEC_UNINITIALIZED;
if (encoded_complete_callback_ == NULL)
return WEBRTC_VIDEO_CODEC_UNINITIALIZED;
rtc::scoped_refptr<I420BufferInterface> input_image =
frame.video_frame_buffer()->ToI420();
// Since we are extracting raw pointers from |input_image| to
// |raw_images_[0]|, the resolution of these frames must match.
RTC_DCHECK_EQ(input_image->width(), raw_images_[0].d_w);
RTC_DCHECK_EQ(input_image->height(), raw_images_[0].d_h);
// Image in vpx_image_t format.
// Input image is const. VP8's raw image is not defined as const.
raw_images_[0].planes[VPX_PLANE_Y] =
const_cast<uint8_t*>(input_image->DataY());
raw_images_[0].planes[VPX_PLANE_U] =
const_cast<uint8_t*>(input_image->DataU());
raw_images_[0].planes[VPX_PLANE_V] =
const_cast<uint8_t*>(input_image->DataV());
raw_images_[0].stride[VPX_PLANE_Y] = input_image->StrideY();
raw_images_[0].stride[VPX_PLANE_U] = input_image->StrideU();
raw_images_[0].stride[VPX_PLANE_V] = input_image->StrideV();
for (size_t i = 1; i < encoders_.size(); ++i) {
// Scale the image down a number of times by downsampling factor
libyuv::I420Scale(
raw_images_[i - 1].planes[VPX_PLANE_Y],
raw_images_[i - 1].stride[VPX_PLANE_Y],
raw_images_[i - 1].planes[VPX_PLANE_U],
raw_images_[i - 1].stride[VPX_PLANE_U],
raw_images_[i - 1].planes[VPX_PLANE_V],
raw_images_[i - 1].stride[VPX_PLANE_V], raw_images_[i - 1].d_w,
raw_images_[i - 1].d_h, raw_images_[i].planes[VPX_PLANE_Y],
raw_images_[i].stride[VPX_PLANE_Y], raw_images_[i].planes[VPX_PLANE_U],
raw_images_[i].stride[VPX_PLANE_U], raw_images_[i].planes[VPX_PLANE_V],
raw_images_[i].stride[VPX_PLANE_V], raw_images_[i].d_w,
raw_images_[i].d_h, libyuv::kFilterBilinear);
}
bool send_key_frame = false;
for (size_t i = 0; i < key_frame_request_.size() && i < send_stream_.size();
++i) {
if (key_frame_request_[i] && send_stream_[i]) {
send_key_frame = true;
break;
}
}
if (!send_key_frame && frame_types) {
for (size_t i = 0; i < frame_types->size() && i < send_stream_.size();
++i) {
if ((*frame_types)[i] == kVideoFrameKey && send_stream_[i]) {
send_key_frame = true;
break;
}
}
}
vpx_enc_frame_flags_t flags[kMaxSimulcastStreams];
Vp8TemporalLayers::FrameConfig tl_configs[kMaxSimulcastStreams];
for (size_t i = 0; i < encoders_.size(); ++i) {
tl_configs[i] = temporal_layers_[i]->UpdateLayerConfig(frame.timestamp());
if (tl_configs[i].drop_frame) {
if (send_key_frame) {
continue;
}
// Drop this frame.
return WEBRTC_VIDEO_CODEC_OK;
}
flags[i] = EncodeFlags(tl_configs[i]);
}
if (send_key_frame) {
// Adapt the size of the key frame when in screenshare with 1 temporal
// layer.
if (encoders_.size() == 1 &&
codec_.mode == VideoCodecMode::kScreensharing &&
codec_.VP8()->numberOfTemporalLayers <= 1) {
const uint32_t forceKeyFrameIntraTh = 100;
libvpx_->codec_control(&(encoders_[0]), VP8E_SET_MAX_INTRA_BITRATE_PCT,
forceKeyFrameIntraTh);
}
// Key frame request from caller.
// Will update both golden and alt-ref.
for (size_t i = 0; i < encoders_.size(); ++i) {
flags[i] = VPX_EFLAG_FORCE_KF;
}
std::fill(key_frame_request_.begin(), key_frame_request_.end(), false);
}
// Set the encoder frame flags and temporal layer_id for each spatial stream.
// Note that |temporal_layers_| are defined starting from lowest resolution at
// position 0 to highest resolution at position |encoders_.size() - 1|,
// whereas |encoder_| is from highest to lowest resolution.
size_t stream_idx = encoders_.size() - 1;
for (size_t i = 0; i < encoders_.size(); ++i, --stream_idx) {
// Allow the layers adapter to temporarily modify the configuration. This
// change isn't stored in configurations_ so change will be discarded at
// the next update.
vpx_codec_enc_cfg_t temp_config;
memcpy(&temp_config, &configurations_[i], sizeof(vpx_codec_enc_cfg_t));
if (UpdateVpxConfiguration(temporal_layers_[stream_idx].get(),
&temp_config)) {
if (libvpx_->codec_enc_config_set(&encoders_[i], &temp_config))
return WEBRTC_VIDEO_CODEC_ERROR;
}
libvpx_->codec_control(&encoders_[i], VP8E_SET_FRAME_FLAGS,
static_cast<int>(flags[stream_idx]));
libvpx_->codec_control(&encoders_[i], VP8E_SET_TEMPORAL_LAYER_ID,
tl_configs[i].encoder_layer_id);
}
// TODO(holmer): Ideally the duration should be the timestamp diff of this
// frame and the next frame to be encoded, which we don't have. Instead we
// would like to use the duration of the previous frame. Unfortunately the
// rate control seems to be off with that setup. Using the average input
// frame rate to calculate an average duration for now.
assert(codec_.maxFramerate > 0);
uint32_t duration = 90000 / codec_.maxFramerate;
int error = WEBRTC_VIDEO_CODEC_OK;
int num_tries = 0;
// If the first try returns WEBRTC_VIDEO_CODEC_TARGET_BITRATE_OVERSHOOT
// the frame must be reencoded with the same parameters again because
// target bitrate is exceeded and encoder state has been reset.
while (num_tries == 0 ||
(num_tries == 1 &&
error == WEBRTC_VIDEO_CODEC_TARGET_BITRATE_OVERSHOOT)) {
++num_tries;
// Note we must pass 0 for |flags| field in encode call below since they are
// set above in |libvpx_interface_->vpx_codec_control_| function for each
// encoder/spatial layer.
error = libvpx_->codec_encode(&encoders_[0], &raw_images_[0], timestamp_,
duration, 0, VPX_DL_REALTIME);
// Reset specific intra frame thresholds, following the key frame.
if (send_key_frame) {
libvpx_->codec_control(&(encoders_[0]), VP8E_SET_MAX_INTRA_BITRATE_PCT,
rc_max_intra_target_);
}
if (error)
return WEBRTC_VIDEO_CODEC_ERROR;
// Examines frame timestamps only.
error = GetEncodedPartitions(frame);
}
// TODO(sprang): Shouldn't we use the frame timestamp instead?
timestamp_ += duration;
return error;
}
void LibvpxVp8Encoder::PopulateCodecSpecific(CodecSpecificInfo* codec_specific,
const vpx_codec_cx_pkt_t& pkt,
int stream_idx,
int encoder_idx,
uint32_t timestamp) {
assert(codec_specific != NULL);
codec_specific->codecType = kVideoCodecVP8;
CodecSpecificInfoVP8* vp8Info = &(codec_specific->codecSpecific.VP8);
vp8Info->keyIdx = kNoKeyIdx; // TODO(hlundin) populate this
vp8Info->nonReference = (pkt.data.frame.flags & VPX_FRAME_IS_DROPPABLE) != 0;
int qp = 0;
vpx_codec_control(&encoders_[encoder_idx], VP8E_GET_LAST_QUANTIZER_64, &qp);
temporal_layers_[stream_idx]->OnEncodeDone(
timestamp, encoded_images_[encoder_idx].size(),
(pkt.data.frame.flags & VPX_FRAME_IS_KEY) != 0, qp, vp8Info);
}
int LibvpxVp8Encoder::GetEncodedPartitions(const VideoFrame& input_image) {
int stream_idx = static_cast<int>(encoders_.size()) - 1;
int result = WEBRTC_VIDEO_CODEC_OK;
for (size_t encoder_idx = 0; encoder_idx < encoders_.size();
++encoder_idx, --stream_idx) {
vpx_codec_iter_t iter = NULL;
encoded_images_[encoder_idx].set_size(0);
encoded_images_[encoder_idx]._frameType = kVideoFrameDelta;
CodecSpecificInfo codec_specific;
const vpx_codec_cx_pkt_t* pkt = NULL;
while ((pkt = libvpx_->codec_get_cx_data(&encoders_[encoder_idx], &iter)) !=
NULL) {
switch (pkt->kind) {
case VPX_CODEC_CX_FRAME_PKT: {
size_t length = encoded_images_[encoder_idx].size();
if (pkt->data.frame.sz + length >
encoded_images_[encoder_idx].capacity()) {
uint8_t* buffer = new uint8_t[pkt->data.frame.sz + length];
memcpy(buffer, encoded_images_[encoder_idx].data(), length);
delete[] encoded_images_[encoder_idx].data();
encoded_images_[encoder_idx].set_buffer(
buffer, pkt->data.frame.sz + length);
}
memcpy(&encoded_images_[encoder_idx].data()[length],
pkt->data.frame.buf, pkt->data.frame.sz);
encoded_images_[encoder_idx].set_size(
encoded_images_[encoder_idx].size() + pkt->data.frame.sz);
break;
}
default:
break;
}
// End of frame
if ((pkt->data.frame.flags & VPX_FRAME_IS_FRAGMENT) == 0) {
// check if encoded frame is a key frame
if (pkt->data.frame.flags & VPX_FRAME_IS_KEY) {
encoded_images_[encoder_idx]._frameType = kVideoFrameKey;
}
encoded_images_[encoder_idx].SetSpatialIndex(stream_idx);
PopulateCodecSpecific(&codec_specific, *pkt, stream_idx, encoder_idx,
input_image.timestamp());
break;
}
}
encoded_images_[encoder_idx].SetTimestamp(input_image.timestamp());
encoded_images_[encoder_idx].capture_time_ms_ =
input_image.render_time_ms();
encoded_images_[encoder_idx].rotation_ = input_image.rotation();
encoded_images_[encoder_idx].content_type_ =
(codec_.mode == VideoCodecMode::kScreensharing)
? VideoContentType::SCREENSHARE
: VideoContentType::UNSPECIFIED;
encoded_images_[encoder_idx].timing_.flags = VideoSendTiming::kInvalid;
encoded_images_[encoder_idx].SetColorSpace(input_image.color_space());
if (send_stream_[stream_idx]) {
if (encoded_images_[encoder_idx].size() > 0) {
TRACE_COUNTER_ID1("webrtc", "EncodedFrameSize", encoder_idx,
encoded_images_[encoder_idx].size());
encoded_images_[encoder_idx]._encodedHeight =
codec_.simulcastStream[stream_idx].height;
encoded_images_[encoder_idx]._encodedWidth =
codec_.simulcastStream[stream_idx].width;
int qp_128 = -1;
libvpx_->codec_control(&encoders_[encoder_idx], VP8E_GET_LAST_QUANTIZER,
&qp_128);
encoded_images_[encoder_idx].qp_ = qp_128;
encoded_complete_callback_->OnEncodedImage(encoded_images_[encoder_idx],
&codec_specific, nullptr);
} else if (!temporal_layers_[stream_idx]
->SupportsEncoderFrameDropping()) {
result = WEBRTC_VIDEO_CODEC_TARGET_BITRATE_OVERSHOOT;
if (encoded_images_[encoder_idx].size() == 0) {
// Dropped frame that will be re-encoded.
temporal_layers_[stream_idx]->OnEncodeDone(input_image.timestamp(), 0,
false, 0, nullptr);
}
}
}
}
return result;
}
VideoEncoder::EncoderInfo LibvpxVp8Encoder::GetEncoderInfo() const {
EncoderInfo info;
info.supports_native_handle = false;
info.implementation_name = "libvpx";
info.has_trusted_rate_controller = trusted_rate_controller_;
info.is_hardware_accelerated = false;
info.has_internal_source = false;
const bool enable_scaling = encoders_.size() == 1 &&
configurations_[0].rc_dropframe_thresh > 0 &&
codec_.VP8().automaticResizeOn;
info.scaling_settings = enable_scaling
? VideoEncoder::ScalingSettings(
kLowVp8QpThreshold, kHighVp8QpThreshold)
: VideoEncoder::ScalingSettings::kOff;
// |encoder_idx| is libvpx index where 0 is highest resolution.
// |si| is simulcast index, where 0 is lowest resolution.
for (size_t si = 0, encoder_idx = encoders_.size() - 1; si < encoders_.size();
++si, --encoder_idx) {
info.fps_allocation[si].clear();
if ((codec_.numberOfSimulcastStreams > si &&
!codec_.simulcastStream[si].active) ||
(si == 0 && SimulcastUtility::IsConferenceModeScreenshare(codec_))) {
// No defined frame rate fractions if not active or if using
// ScreenshareLayers, leave vector empty and continue;
continue;
}
if (configurations_[encoder_idx].ts_number_layers <= 1) {
info.fps_allocation[si].push_back(EncoderInfo::kMaxFramerateFraction);
} else {
for (size_t ti = 0; ti < configurations_[encoder_idx].ts_number_layers;
++ti) {
RTC_DCHECK_GT(configurations_[encoder_idx].ts_rate_decimator[ti], 0);
info.fps_allocation[si].push_back(rtc::saturated_cast<uint8_t>(
EncoderInfo::kMaxFramerateFraction /
configurations_[encoder_idx].ts_rate_decimator[ti] +
0.5));
}
}
}
return info;
}
int LibvpxVp8Encoder::RegisterEncodeCompleteCallback(
EncodedImageCallback* callback) {
encoded_complete_callback_ = callback;
return WEBRTC_VIDEO_CODEC_OK;
}
} // namespace webrtc
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