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652bd288b3
Instead of from the global field trial string. Bug: webrtc:42220378 Change-Id: Iddb41429e388792de02f702b4caa35689c57d9e5 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/347720 Reviewed-by: Erik Språng <sprang@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/main@{#42201}
242 lines
9.5 KiB
C++
242 lines
9.5 KiB
C++
/*
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* Copyright 2021 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 "rtc_base/experiments/encoder_info_settings.h"
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#include <stdio.h>
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#include "absl/strings/string_view.h"
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#include "api/field_trials_view.h"
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#include "rtc_base/experiments/field_trial_list.h"
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#include "rtc_base/logging.h"
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namespace webrtc {
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namespace {
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std::vector<VideoEncoder::ResolutionBitrateLimits> ToResolutionBitrateLimits(
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const std::vector<EncoderInfoSettings::BitrateLimit>& limits) {
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std::vector<VideoEncoder::ResolutionBitrateLimits> result;
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for (const auto& limit : limits) {
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result.push_back(VideoEncoder::ResolutionBitrateLimits(
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limit.frame_size_pixels, limit.min_start_bitrate_bps,
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limit.min_bitrate_bps, limit.max_bitrate_bps));
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}
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return result;
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}
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constexpr float kDefaultMinBitratebps = 30000;
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} // namespace
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// Default bitrate limits for simulcast with one active stream:
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// {frame_size_pixels, min_start_bitrate_bps, min_bitrate_bps, max_bitrate_bps}.
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std::vector<VideoEncoder::ResolutionBitrateLimits>
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EncoderInfoSettings::GetDefaultSinglecastBitrateLimits(
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VideoCodecType codec_type) {
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if (codec_type == kVideoCodecAV1) {
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// AV1 singlecast max bitrate limits are higher than AV1 SVC max limits.
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// This is because in singlecast we normally have just one receiver, BWE is
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// known end-to-end and the encode target bitrate guarantees delivery of
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// video.
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// The min bitrate limits are not used in singlecast (used in SVC/simulcast
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// to de-/activate spatial layers) and are set to zero. Send resolution in
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// singlecast is assumed to be regulated by QP-based quality scaler.
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return {{320 * 180, 0, 0, 256000},
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{480 * 270, 176000, 0, 384000},
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{640 * 360, 256000, 0, 512000},
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{960 * 540, 384000, 0, 1024000},
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{1280 * 720, 576000, 0, 1536000}};
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}
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if (codec_type == kVideoCodecVP9) {
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// VP9 singlecast bitrate limits are derived ~directly from VP9 SVC bitrate
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// limits. The current max limits are unnecessarily too strict for
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// singlecast, where BWE is known end-to-end, especially for low
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// resolutions.
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return {{320 * 180, 0, 30000, 150000},
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{480 * 270, 120000, 30000, 300000},
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{640 * 360, 190000, 30000, 420000},
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{960 * 540, 350000, 30000, 1000000},
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{1280 * 720, 480000, 30000, 1500000}};
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}
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// VP8 and other codecs.
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return {{320 * 180, 0, 30000, 300000},
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{480 * 270, 200000, 30000, 500000},
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{640 * 360, 300000, 30000, 800000},
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{960 * 540, 500000, 30000, 1500000},
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{1280 * 720, 900000, 30000, 2500000}};
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}
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absl::optional<VideoEncoder::ResolutionBitrateLimits>
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EncoderInfoSettings::GetDefaultSinglecastBitrateLimitsForResolution(
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VideoCodecType codec_type,
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int frame_size_pixels) {
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VideoEncoder::EncoderInfo info;
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info.resolution_bitrate_limits =
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GetDefaultSinglecastBitrateLimits(codec_type);
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return info.GetEncoderBitrateLimitsForResolution(frame_size_pixels);
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}
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// Return the suitable bitrate limits for specified resolution when qp is
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// untrusted, they are experimental values.
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// TODO(bugs.webrtc.org/12942): Maybe we need to add other codecs(VP8/VP9)
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// experimental values.
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std::vector<VideoEncoder::ResolutionBitrateLimits>
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EncoderInfoSettings::GetDefaultSinglecastBitrateLimitsWhenQpIsUntrusted() {
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// Specific limits for H264/AVC
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return {{0 * 0, 0, 0, 0},
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{320 * 180, 0, 30000, 300000},
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{480 * 270, 300000, 30000, 500000},
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{640 * 360, 500000, 30000, 800000},
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{960 * 540, 800000, 30000, 1500000},
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{1280 * 720, 1500000, 30000, 2500000},
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{1920 * 1080, 2500000, 30000, 4000000}};
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}
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// Through linear interpolation, return the bitrate limit corresponding to the
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// specified |frame_size_pixels|.
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absl::optional<VideoEncoder::ResolutionBitrateLimits>
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EncoderInfoSettings::GetSinglecastBitrateLimitForResolutionWhenQpIsUntrusted(
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absl::optional<int> frame_size_pixels,
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const std::vector<VideoEncoder::ResolutionBitrateLimits>&
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resolution_bitrate_limits) {
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if (!frame_size_pixels.has_value() || frame_size_pixels.value() <= 0) {
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return absl::nullopt;
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}
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std::vector<VideoEncoder::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 VideoEncoder::ResolutionBitrateLimits& lhs,
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const VideoEncoder::ResolutionBitrateLimits& rhs) {
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return lhs.frame_size_pixels < rhs.frame_size_pixels;
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});
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if (bitrate_limits.empty()) {
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return absl::nullopt;
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}
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int interpolation_index = -1;
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for (size_t i = 0; i < bitrate_limits.size(); ++i) {
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if (bitrate_limits[i].frame_size_pixels >= frame_size_pixels.value()) {
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interpolation_index = i;
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break;
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}
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}
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// -1 means that the maximum resolution is exceeded, we will select the
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// largest data as the return result.
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if (interpolation_index == -1) {
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return *bitrate_limits.rbegin();
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}
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// If we have a matching resolution, return directly without interpolation.
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if (bitrate_limits[interpolation_index].frame_size_pixels ==
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frame_size_pixels.value()) {
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return bitrate_limits[interpolation_index];
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}
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// No matching resolution, do a linear interpolate.
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int lower_pixel_count =
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bitrate_limits[interpolation_index - 1].frame_size_pixels;
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int upper_pixel_count = bitrate_limits[interpolation_index].frame_size_pixels;
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float alpha = (frame_size_pixels.value() - lower_pixel_count) * 1.0 /
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(upper_pixel_count - lower_pixel_count);
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int min_start_bitrate_bps = static_cast<int>(
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bitrate_limits[interpolation_index].min_start_bitrate_bps * alpha +
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bitrate_limits[interpolation_index - 1].min_start_bitrate_bps *
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(1.0 - alpha));
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int max_bitrate_bps = static_cast<int>(
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bitrate_limits[interpolation_index].max_bitrate_bps * alpha +
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bitrate_limits[interpolation_index - 1].max_bitrate_bps * (1.0 - alpha));
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if (max_bitrate_bps >= min_start_bitrate_bps) {
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return VideoEncoder::ResolutionBitrateLimits(
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frame_size_pixels.value(), min_start_bitrate_bps, kDefaultMinBitratebps,
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max_bitrate_bps);
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} else {
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RTC_LOG(LS_WARNING)
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<< "BitRate interpolation calculating result is abnormal. "
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<< " lower_pixel_count = " << lower_pixel_count
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<< " upper_pixel_count = " << upper_pixel_count
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<< " frame_size_pixels = " << frame_size_pixels.value()
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<< " min_start_bitrate_bps = " << min_start_bitrate_bps
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<< " min_bitrate_bps = " << kDefaultMinBitratebps
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<< " max_bitrate_bps = " << max_bitrate_bps;
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return absl::nullopt;
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}
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}
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EncoderInfoSettings::EncoderInfoSettings(const FieldTrialsView& field_trials,
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absl::string_view name)
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: requested_resolution_alignment_("requested_resolution_alignment"),
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apply_alignment_to_all_simulcast_layers_(
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"apply_alignment_to_all_simulcast_layers") {
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FieldTrialStructList<BitrateLimit> bitrate_limits(
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{FieldTrialStructMember(
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"frame_size_pixels",
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[](BitrateLimit* b) { return &b->frame_size_pixels; }),
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FieldTrialStructMember(
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"min_start_bitrate_bps",
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[](BitrateLimit* b) { return &b->min_start_bitrate_bps; }),
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FieldTrialStructMember(
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"min_bitrate_bps",
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[](BitrateLimit* b) { return &b->min_bitrate_bps; }),
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FieldTrialStructMember(
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"max_bitrate_bps",
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[](BitrateLimit* b) { return &b->max_bitrate_bps; })},
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{});
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std::string experiment_string = field_trials.Lookup(name);
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if (experiment_string.empty()) {
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// Encoder name not found, use common string applying to all encoders.
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experiment_string = field_trials.Lookup("WebRTC-GetEncoderInfoOverride");
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}
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ParseFieldTrial({&bitrate_limits, &requested_resolution_alignment_,
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&apply_alignment_to_all_simulcast_layers_},
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experiment_string);
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resolution_bitrate_limits_ = ToResolutionBitrateLimits(bitrate_limits.Get());
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}
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absl::optional<uint32_t> EncoderInfoSettings::requested_resolution_alignment()
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const {
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if (requested_resolution_alignment_ &&
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requested_resolution_alignment_.Value() < 1) {
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RTC_LOG(LS_WARNING) << "Unsupported alignment value, ignored.";
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return absl::nullopt;
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}
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return requested_resolution_alignment_.GetOptional();
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}
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EncoderInfoSettings::~EncoderInfoSettings() {}
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SimulcastEncoderAdapterEncoderInfoSettings::
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SimulcastEncoderAdapterEncoderInfoSettings(
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const FieldTrialsView& field_trials)
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: EncoderInfoSettings(
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field_trials,
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"WebRTC-SimulcastEncoderAdapter-GetEncoderInfoOverride") {}
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LibvpxVp8EncoderInfoSettings::LibvpxVp8EncoderInfoSettings(
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const FieldTrialsView& field_trials)
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: EncoderInfoSettings(field_trials, "WebRTC-VP8-GetEncoderInfoOverride") {}
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LibvpxVp9EncoderInfoSettings::LibvpxVp9EncoderInfoSettings(
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const FieldTrialsView& field_trials)
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: EncoderInfoSettings(field_trials, "WebRTC-VP9-GetEncoderInfoOverride") {}
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LibaomAv1EncoderInfoSettings::LibaomAv1EncoderInfoSettings(
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const FieldTrialsView& field_trials)
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: EncoderInfoSettings(field_trials, "WebRTC-Av1-GetEncoderInfoOverride") {}
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} // namespace webrtc
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