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320 lines
11 KiB
320 lines
11 KiB
/*
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* Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "api/video_codecs/video_encoder.h"
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#include <string.h>
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#include <algorithm>
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#include "rtc_base/checks.h"
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#include "rtc_base/strings/string_builder.h"
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namespace webrtc {
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// TODO(mflodman): Add default complexity for VP9 and VP9.
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VideoCodecVP8 VideoEncoder::GetDefaultVp8Settings() {
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VideoCodecVP8 vp8_settings;
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memset(&vp8_settings, 0, sizeof(vp8_settings));
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vp8_settings.numberOfTemporalLayers = 1;
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vp8_settings.denoisingOn = true;
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vp8_settings.automaticResizeOn = false;
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vp8_settings.frameDroppingOn = true;
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vp8_settings.keyFrameInterval = 3000;
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return vp8_settings;
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}
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VideoCodecVP9 VideoEncoder::GetDefaultVp9Settings() {
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VideoCodecVP9 vp9_settings;
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memset(&vp9_settings, 0, sizeof(vp9_settings));
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vp9_settings.numberOfTemporalLayers = 1;
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vp9_settings.denoisingOn = true;
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vp9_settings.frameDroppingOn = true;
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vp9_settings.keyFrameInterval = 3000;
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vp9_settings.adaptiveQpMode = true;
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vp9_settings.automaticResizeOn = true;
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vp9_settings.numberOfSpatialLayers = 1;
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vp9_settings.flexibleMode = false;
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vp9_settings.interLayerPred = InterLayerPredMode::kOn;
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return vp9_settings;
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}
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VideoCodecH264 VideoEncoder::GetDefaultH264Settings() {
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VideoCodecH264 h264_settings;
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memset(&h264_settings, 0, sizeof(h264_settings));
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h264_settings.frameDroppingOn = true;
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h264_settings.keyFrameInterval = 3000;
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h264_settings.numberOfTemporalLayers = 1;
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return h264_settings;
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}
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VideoEncoder::ScalingSettings::ScalingSettings() = default;
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VideoEncoder::ScalingSettings::ScalingSettings(KOff) : ScalingSettings() {}
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VideoEncoder::ScalingSettings::ScalingSettings(int low, int high)
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: thresholds(QpThresholds(low, high)) {}
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VideoEncoder::ScalingSettings::ScalingSettings(int low,
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int high,
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int min_pixels)
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: thresholds(QpThresholds(low, high)), min_pixels_per_frame(min_pixels) {}
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VideoEncoder::ScalingSettings::ScalingSettings(const ScalingSettings&) =
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default;
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VideoEncoder::ScalingSettings::~ScalingSettings() {}
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// static
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constexpr VideoEncoder::ScalingSettings::KOff
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VideoEncoder::ScalingSettings::kOff;
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// static
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constexpr uint8_t VideoEncoder::EncoderInfo::kMaxFramerateFraction;
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bool VideoEncoder::ResolutionBitrateLimits::operator==(
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const ResolutionBitrateLimits& rhs) const {
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return frame_size_pixels == rhs.frame_size_pixels &&
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min_start_bitrate_bps == rhs.min_start_bitrate_bps &&
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min_bitrate_bps == rhs.min_bitrate_bps &&
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max_bitrate_bps == rhs.max_bitrate_bps;
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}
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VideoEncoder::EncoderInfo::EncoderInfo()
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: scaling_settings(VideoEncoder::ScalingSettings::kOff),
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requested_resolution_alignment(1),
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supports_native_handle(false),
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implementation_name("unknown"),
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has_trusted_rate_controller(false),
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is_hardware_accelerated(true),
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has_internal_source(false),
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fps_allocation{absl::InlinedVector<uint8_t, kMaxTemporalStreams>(
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1,
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kMaxFramerateFraction)},
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supports_simulcast(false) {}
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VideoEncoder::EncoderInfo::EncoderInfo(const EncoderInfo&) = default;
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VideoEncoder::EncoderInfo::~EncoderInfo() = default;
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std::string VideoEncoder::EncoderInfo::ToString() const {
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char string_buf[2048];
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rtc::SimpleStringBuilder oss(string_buf);
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oss << "EncoderInfo { "
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"ScalingSettings { ";
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if (scaling_settings.thresholds) {
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oss << "Thresholds { "
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"low = "
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<< scaling_settings.thresholds->low
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<< ", high = " << scaling_settings.thresholds->high << "}, ";
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}
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oss << "min_pixels_per_frame = " << scaling_settings.min_pixels_per_frame
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<< " }";
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oss << ", requested_resolution_alignment = " << requested_resolution_alignment
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<< ", supports_native_handle = " << supports_native_handle
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<< ", implementation_name = '" << implementation_name
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<< "'"
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", has_trusted_rate_controller = "
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<< has_trusted_rate_controller
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<< ", is_hardware_accelerated = " << is_hardware_accelerated
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<< ", has_internal_source = " << has_internal_source
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<< ", fps_allocation = [";
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bool first = true;
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for (size_t i = 0; i < fps_allocation->size(); ++i) {
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if (!first) {
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oss << ", ";
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}
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const absl::InlinedVector<uint8_t, kMaxTemporalStreams>& fractions =
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fps_allocation[i];
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if (!fractions.empty()) {
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first = false;
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oss << "[ ";
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for (size_t i = 0; i < fractions.size(); ++i) {
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if (i > 0) {
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oss << ", ";
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}
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oss << (static_cast<double>(fractions[i]) / kMaxFramerateFraction);
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}
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oss << "] ";
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}
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}
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oss << "]";
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oss << ", resolution_bitrate_limits = [";
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for (size_t i = 0; i < resolution_bitrate_limits.size(); ++i) {
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if (i > 0) {
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oss << ", ";
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}
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ResolutionBitrateLimits l = resolution_bitrate_limits[i];
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oss << "Limits { "
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"frame_size_pixels = "
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<< l.frame_size_pixels
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<< ", min_start_bitrate_bps = " << l.min_start_bitrate_bps
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<< ", min_bitrate_bps = " << l.min_bitrate_bps
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<< ", max_bitrate_bps = " << l.max_bitrate_bps << "} ";
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}
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oss << "] "
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", supports_simulcast = "
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<< supports_simulcast << "}";
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return oss.str();
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}
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bool VideoEncoder::EncoderInfo::operator==(const EncoderInfo& rhs) const {
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if (scaling_settings.thresholds.has_value() !=
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rhs.scaling_settings.thresholds.has_value()) {
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return false;
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}
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if (scaling_settings.thresholds.has_value()) {
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QpThresholds l = *scaling_settings.thresholds;
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QpThresholds r = *rhs.scaling_settings.thresholds;
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if (l.low != r.low || l.high != r.high) {
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return false;
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}
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}
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if (scaling_settings.min_pixels_per_frame !=
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rhs.scaling_settings.min_pixels_per_frame) {
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return false;
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}
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if (supports_native_handle != rhs.supports_native_handle ||
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implementation_name != rhs.implementation_name ||
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has_trusted_rate_controller != rhs.has_trusted_rate_controller ||
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is_hardware_accelerated != rhs.is_hardware_accelerated ||
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has_internal_source != rhs.has_internal_source) {
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return false;
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}
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for (size_t i = 0; i < kMaxSpatialLayers; ++i) {
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if (fps_allocation[i] != rhs.fps_allocation[i]) {
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return false;
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}
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}
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if (resolution_bitrate_limits != rhs.resolution_bitrate_limits ||
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supports_simulcast != rhs.supports_simulcast) {
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return false;
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}
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return true;
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}
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absl::optional<VideoEncoder::ResolutionBitrateLimits>
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VideoEncoder::EncoderInfo::GetEncoderBitrateLimitsForResolution(
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int frame_size_pixels) const {
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std::vector<ResolutionBitrateLimits> bitrate_limits =
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resolution_bitrate_limits;
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// Sort the list of bitrate limits by resolution.
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sort(bitrate_limits.begin(), bitrate_limits.end(),
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[](const ResolutionBitrateLimits& lhs,
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const ResolutionBitrateLimits& rhs) {
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return lhs.frame_size_pixels < rhs.frame_size_pixels;
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});
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for (size_t i = 0; i < bitrate_limits.size(); ++i) {
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RTC_DCHECK_GE(bitrate_limits[i].min_bitrate_bps, 0);
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RTC_DCHECK_GE(bitrate_limits[i].min_start_bitrate_bps, 0);
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RTC_DCHECK_GE(bitrate_limits[i].max_bitrate_bps,
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bitrate_limits[i].min_bitrate_bps);
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if (i > 0) {
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// The bitrate limits aren't expected to decrease with resolution.
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RTC_DCHECK_GE(bitrate_limits[i].min_bitrate_bps,
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bitrate_limits[i - 1].min_bitrate_bps);
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RTC_DCHECK_GE(bitrate_limits[i].min_start_bitrate_bps,
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bitrate_limits[i - 1].min_start_bitrate_bps);
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RTC_DCHECK_GE(bitrate_limits[i].max_bitrate_bps,
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bitrate_limits[i - 1].max_bitrate_bps);
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}
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if (bitrate_limits[i].frame_size_pixels >= frame_size_pixels) {
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return absl::optional<ResolutionBitrateLimits>(bitrate_limits[i]);
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}
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}
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return absl::nullopt;
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}
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VideoEncoder::RateControlParameters::RateControlParameters()
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: bitrate(VideoBitrateAllocation()),
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framerate_fps(0.0),
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bandwidth_allocation(DataRate::Zero()) {}
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VideoEncoder::RateControlParameters::RateControlParameters(
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const VideoBitrateAllocation& bitrate,
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double framerate_fps)
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: bitrate(bitrate),
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framerate_fps(framerate_fps),
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bandwidth_allocation(DataRate::BitsPerSec(bitrate.get_sum_bps())) {}
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VideoEncoder::RateControlParameters::RateControlParameters(
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const VideoBitrateAllocation& bitrate,
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double framerate_fps,
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DataRate bandwidth_allocation)
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: bitrate(bitrate),
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framerate_fps(framerate_fps),
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bandwidth_allocation(bandwidth_allocation) {}
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bool VideoEncoder::RateControlParameters::operator==(
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const VideoEncoder::RateControlParameters& rhs) const {
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return std::tie(bitrate, framerate_fps, bandwidth_allocation) ==
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std::tie(rhs.bitrate, rhs.framerate_fps, rhs.bandwidth_allocation);
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}
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bool VideoEncoder::RateControlParameters::operator!=(
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const VideoEncoder::RateControlParameters& rhs) const {
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return !(rhs == *this);
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}
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VideoEncoder::RateControlParameters::~RateControlParameters() = default;
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void VideoEncoder::SetFecControllerOverride(
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FecControllerOverride* fec_controller_override) {}
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int32_t VideoEncoder::InitEncode(const VideoCodec* codec_settings,
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int32_t number_of_cores,
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size_t max_payload_size) {
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const VideoEncoder::Capabilities capabilities(/* loss_notification= */ false);
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const VideoEncoder::Settings settings(capabilities, number_of_cores,
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max_payload_size);
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// In theory, this and the other version of InitEncode() could end up calling
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// each other in a loop until we get a stack overflow.
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// In practice, any subclass of VideoEncoder would overload at least one
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// of these, and we have a TODO in the header file to make this pure virtual.
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return InitEncode(codec_settings, settings);
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}
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int VideoEncoder::InitEncode(const VideoCodec* codec_settings,
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const VideoEncoder::Settings& settings) {
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// In theory, this and the other version of InitEncode() could end up calling
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// each other in a loop until we get a stack overflow.
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// In practice, any subclass of VideoEncoder would overload at least one
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// of these, and we have a TODO in the header file to make this pure virtual.
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return InitEncode(codec_settings, settings.number_of_cores,
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settings.max_payload_size);
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}
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void VideoEncoder::OnPacketLossRateUpdate(float packet_loss_rate) {}
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void VideoEncoder::OnRttUpdate(int64_t rtt_ms) {}
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void VideoEncoder::OnLossNotification(
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const LossNotification& loss_notification) {}
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// TODO(webrtc:9722): Remove and make pure virtual.
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VideoEncoder::EncoderInfo VideoEncoder::GetEncoderInfo() const {
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return EncoderInfo();
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}
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} // namespace webrtc
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