742 lines
30 KiB
C++
742 lines
30 KiB
C++
/*
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* Copyright 2020 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 "call/adaptation/video_stream_adapter.h"
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#include <algorithm>
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#include <limits>
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#include <utility>
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#include "absl/types/optional.h"
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#include "absl/types/variant.h"
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#include "api/sequence_checker.h"
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#include "api/video/video_adaptation_counters.h"
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#include "api/video/video_adaptation_reason.h"
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#include "api/video_codecs/video_encoder.h"
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#include "call/adaptation/video_source_restrictions.h"
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#include "call/adaptation/video_stream_input_state.h"
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#include "rtc_base/checks.h"
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#include "rtc_base/constructor_magic.h"
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#include "rtc_base/logging.h"
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#include "rtc_base/numerics/safe_conversions.h"
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namespace webrtc {
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const int kMinFrameRateFps = 2;
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namespace {
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// For frame rate, the steps we take are 2/3 (down) and 3/2 (up).
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int GetLowerFrameRateThan(int fps) {
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RTC_DCHECK(fps != std::numeric_limits<int>::max());
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return (fps * 2) / 3;
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}
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// TODO(hbos): Use absl::optional<> instead?
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int GetHigherFrameRateThan(int fps) {
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return fps != std::numeric_limits<int>::max()
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? (fps * 3) / 2
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: std::numeric_limits<int>::max();
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}
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int GetIncreasedMaxPixelsWanted(int target_pixels) {
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if (target_pixels == std::numeric_limits<int>::max())
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return std::numeric_limits<int>::max();
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// When we decrease resolution, we go down to at most 3/5 of current pixels.
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// Thus to increase resolution, we need 3/5 to get back to where we started.
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// When going up, the desired max_pixels_per_frame() has to be significantly
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// higher than the target because the source's native resolutions might not
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// match the target. We pick 12/5 of the target.
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//
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// (This value was historically 4 times the old target, which is (3/5)*4 of
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// the new target - or 12/5 - assuming the target is adjusted according to
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// the above steps.)
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RTC_DCHECK(target_pixels != std::numeric_limits<int>::max());
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return (target_pixels * 12) / 5;
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}
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bool CanDecreaseResolutionTo(int target_pixels,
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int target_pixels_min,
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const VideoStreamInputState& input_state,
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const VideoSourceRestrictions& restrictions) {
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int max_pixels_per_frame =
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rtc::dchecked_cast<int>(restrictions.max_pixels_per_frame().value_or(
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std::numeric_limits<int>::max()));
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return target_pixels < max_pixels_per_frame &&
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target_pixels_min >= input_state.min_pixels_per_frame();
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}
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bool CanIncreaseResolutionTo(int target_pixels,
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const VideoSourceRestrictions& restrictions) {
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int max_pixels_wanted = GetIncreasedMaxPixelsWanted(target_pixels);
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int max_pixels_per_frame =
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rtc::dchecked_cast<int>(restrictions.max_pixels_per_frame().value_or(
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std::numeric_limits<int>::max()));
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return max_pixels_wanted > max_pixels_per_frame;
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}
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bool CanDecreaseFrameRateTo(int max_frame_rate,
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const VideoSourceRestrictions& restrictions) {
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const int fps_wanted = std::max(kMinFrameRateFps, max_frame_rate);
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return fps_wanted <
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rtc::dchecked_cast<int>(restrictions.max_frame_rate().value_or(
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std::numeric_limits<int>::max()));
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}
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bool CanIncreaseFrameRateTo(int max_frame_rate,
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const VideoSourceRestrictions& restrictions) {
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return max_frame_rate >
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rtc::dchecked_cast<int>(restrictions.max_frame_rate().value_or(
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std::numeric_limits<int>::max()));
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}
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bool MinPixelLimitReached(const VideoStreamInputState& input_state) {
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if (input_state.single_active_stream_pixels().has_value()) {
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return GetLowerResolutionThan(
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input_state.single_active_stream_pixels().value()) <
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input_state.min_pixels_per_frame();
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}
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return input_state.frame_size_pixels().has_value() &&
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GetLowerResolutionThan(input_state.frame_size_pixels().value()) <
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input_state.min_pixels_per_frame();
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}
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} // namespace
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VideoSourceRestrictionsListener::~VideoSourceRestrictionsListener() = default;
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VideoSourceRestrictions FilterRestrictionsByDegradationPreference(
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VideoSourceRestrictions source_restrictions,
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DegradationPreference degradation_preference) {
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switch (degradation_preference) {
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case DegradationPreference::BALANCED:
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break;
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case DegradationPreference::MAINTAIN_FRAMERATE:
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source_restrictions.set_max_frame_rate(absl::nullopt);
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break;
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case DegradationPreference::MAINTAIN_RESOLUTION:
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source_restrictions.set_max_pixels_per_frame(absl::nullopt);
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source_restrictions.set_target_pixels_per_frame(absl::nullopt);
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break;
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case DegradationPreference::DISABLED:
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source_restrictions.set_max_pixels_per_frame(absl::nullopt);
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source_restrictions.set_target_pixels_per_frame(absl::nullopt);
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source_restrictions.set_max_frame_rate(absl::nullopt);
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}
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return source_restrictions;
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}
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// For resolution, the steps we take are 3/5 (down) and 5/3 (up).
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// Notice the asymmetry of which restriction property is set depending on if
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// we are adapting up or down:
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// - VideoSourceRestrictor::DecreaseResolution() sets the max_pixels_per_frame()
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// to the desired target and target_pixels_per_frame() to null.
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// - VideoSourceRestrictor::IncreaseResolutionTo() sets the
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// target_pixels_per_frame() to the desired target, and max_pixels_per_frame()
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// is set according to VideoSourceRestrictor::GetIncreasedMaxPixelsWanted().
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int GetLowerResolutionThan(int pixel_count) {
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RTC_DCHECK(pixel_count != std::numeric_limits<int>::max());
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return (pixel_count * 3) / 5;
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}
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// TODO(hbos): Use absl::optional<> instead?
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int GetHigherResolutionThan(int pixel_count) {
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return pixel_count != std::numeric_limits<int>::max()
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? (pixel_count * 5) / 3
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: std::numeric_limits<int>::max();
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}
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// static
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const char* Adaptation::StatusToString(Adaptation::Status status) {
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switch (status) {
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case Adaptation::Status::kValid:
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return "kValid";
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case Adaptation::Status::kLimitReached:
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return "kLimitReached";
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case Adaptation::Status::kAwaitingPreviousAdaptation:
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return "kAwaitingPreviousAdaptation";
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case Status::kInsufficientInput:
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return "kInsufficientInput";
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case Status::kAdaptationDisabled:
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return "kAdaptationDisabled";
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case Status::kRejectedByConstraint:
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return "kRejectedByConstraint";
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}
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RTC_CHECK_NOTREACHED();
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}
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Adaptation::Adaptation(int validation_id,
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VideoSourceRestrictions restrictions,
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VideoAdaptationCounters counters,
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VideoStreamInputState input_state)
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: validation_id_(validation_id),
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status_(Status::kValid),
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input_state_(std::move(input_state)),
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restrictions_(std::move(restrictions)),
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counters_(std::move(counters)) {}
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Adaptation::Adaptation(int validation_id, Status invalid_status)
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: validation_id_(validation_id), status_(invalid_status) {
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RTC_DCHECK_NE(status_, Status::kValid);
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}
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Adaptation::Status Adaptation::status() const {
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return status_;
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}
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const VideoStreamInputState& Adaptation::input_state() const {
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return input_state_;
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}
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const VideoSourceRestrictions& Adaptation::restrictions() const {
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return restrictions_;
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}
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const VideoAdaptationCounters& Adaptation::counters() const {
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return counters_;
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}
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VideoStreamAdapter::VideoStreamAdapter(
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VideoStreamInputStateProvider* input_state_provider,
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VideoStreamEncoderObserver* encoder_stats_observer)
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: input_state_provider_(input_state_provider),
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encoder_stats_observer_(encoder_stats_observer),
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adaptation_validation_id_(0),
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degradation_preference_(DegradationPreference::DISABLED),
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awaiting_frame_size_change_(absl::nullopt) {
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sequence_checker_.Detach();
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RTC_DCHECK(input_state_provider_);
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RTC_DCHECK(encoder_stats_observer_);
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}
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VideoStreamAdapter::~VideoStreamAdapter() {
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RTC_DCHECK(adaptation_constraints_.empty())
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<< "There are constaint(s) attached to a VideoStreamAdapter being "
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"destroyed.";
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}
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VideoSourceRestrictions VideoStreamAdapter::source_restrictions() const {
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RTC_DCHECK_RUN_ON(&sequence_checker_);
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return current_restrictions_.restrictions;
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}
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const VideoAdaptationCounters& VideoStreamAdapter::adaptation_counters() const {
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RTC_DCHECK_RUN_ON(&sequence_checker_);
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return current_restrictions_.counters;
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}
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void VideoStreamAdapter::ClearRestrictions() {
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RTC_DCHECK_RUN_ON(&sequence_checker_);
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// Invalidate any previously returned Adaptation.
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RTC_LOG(LS_INFO) << "Resetting restrictions";
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++adaptation_validation_id_;
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current_restrictions_ = {VideoSourceRestrictions(),
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VideoAdaptationCounters()};
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awaiting_frame_size_change_ = absl::nullopt;
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BroadcastVideoRestrictionsUpdate(input_state_provider_->InputState(),
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nullptr);
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}
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void VideoStreamAdapter::AddRestrictionsListener(
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VideoSourceRestrictionsListener* restrictions_listener) {
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RTC_DCHECK_RUN_ON(&sequence_checker_);
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RTC_DCHECK(std::find(restrictions_listeners_.begin(),
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restrictions_listeners_.end(),
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restrictions_listener) == restrictions_listeners_.end());
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restrictions_listeners_.push_back(restrictions_listener);
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}
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void VideoStreamAdapter::RemoveRestrictionsListener(
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VideoSourceRestrictionsListener* restrictions_listener) {
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RTC_DCHECK_RUN_ON(&sequence_checker_);
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auto it = std::find(restrictions_listeners_.begin(),
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restrictions_listeners_.end(), restrictions_listener);
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RTC_DCHECK(it != restrictions_listeners_.end());
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restrictions_listeners_.erase(it);
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}
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void VideoStreamAdapter::AddAdaptationConstraint(
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AdaptationConstraint* adaptation_constraint) {
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RTC_DCHECK_RUN_ON(&sequence_checker_);
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RTC_DCHECK(std::find(adaptation_constraints_.begin(),
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adaptation_constraints_.end(),
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adaptation_constraint) == adaptation_constraints_.end());
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adaptation_constraints_.push_back(adaptation_constraint);
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}
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void VideoStreamAdapter::RemoveAdaptationConstraint(
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AdaptationConstraint* adaptation_constraint) {
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RTC_DCHECK_RUN_ON(&sequence_checker_);
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auto it = std::find(adaptation_constraints_.begin(),
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adaptation_constraints_.end(), adaptation_constraint);
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RTC_DCHECK(it != adaptation_constraints_.end());
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adaptation_constraints_.erase(it);
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}
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void VideoStreamAdapter::SetDegradationPreference(
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DegradationPreference degradation_preference) {
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RTC_DCHECK_RUN_ON(&sequence_checker_);
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if (degradation_preference_ == degradation_preference)
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return;
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// Invalidate any previously returned Adaptation.
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++adaptation_validation_id_;
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bool balanced_switch =
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degradation_preference == DegradationPreference::BALANCED ||
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degradation_preference_ == DegradationPreference::BALANCED;
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degradation_preference_ = degradation_preference;
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if (balanced_switch) {
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// ClearRestrictions() calls BroadcastVideoRestrictionsUpdate(nullptr).
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ClearRestrictions();
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} else {
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BroadcastVideoRestrictionsUpdate(input_state_provider_->InputState(),
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nullptr);
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}
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}
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struct VideoStreamAdapter::RestrictionsOrStateVisitor {
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Adaptation operator()(const RestrictionsWithCounters& r) const {
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return Adaptation(adaptation_validation_id, r.restrictions, r.counters,
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input_state);
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}
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Adaptation operator()(const Adaptation::Status& status) const {
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RTC_DCHECK_NE(status, Adaptation::Status::kValid);
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return Adaptation(adaptation_validation_id, status);
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}
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const int adaptation_validation_id;
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const VideoStreamInputState& input_state;
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};
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Adaptation VideoStreamAdapter::RestrictionsOrStateToAdaptation(
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VideoStreamAdapter::RestrictionsOrState step_or_state,
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const VideoStreamInputState& input_state) const {
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RTC_DCHECK(!step_or_state.valueless_by_exception());
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return absl::visit(
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RestrictionsOrStateVisitor{adaptation_validation_id_, input_state},
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step_or_state);
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}
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Adaptation VideoStreamAdapter::GetAdaptationUp(
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const VideoStreamInputState& input_state) const {
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RestrictionsOrState step = GetAdaptationUpStep(input_state);
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// If an adaptation proposed, check with the constraints that it is ok.
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if (absl::holds_alternative<RestrictionsWithCounters>(step)) {
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RestrictionsWithCounters restrictions =
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absl::get<RestrictionsWithCounters>(step);
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for (const auto* constraint : adaptation_constraints_) {
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if (!constraint->IsAdaptationUpAllowed(input_state,
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current_restrictions_.restrictions,
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restrictions.restrictions)) {
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RTC_LOG(LS_INFO) << "Not adapting up because constraint \""
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<< constraint->Name() << "\" disallowed it";
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step = Adaptation::Status::kRejectedByConstraint;
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}
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}
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}
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return RestrictionsOrStateToAdaptation(step, input_state);
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}
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Adaptation VideoStreamAdapter::GetAdaptationUp() {
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RTC_DCHECK_RUN_ON(&sequence_checker_);
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VideoStreamInputState input_state = input_state_provider_->InputState();
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++adaptation_validation_id_;
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Adaptation adaptation = GetAdaptationUp(input_state);
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return adaptation;
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}
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VideoStreamAdapter::RestrictionsOrState VideoStreamAdapter::GetAdaptationUpStep(
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const VideoStreamInputState& input_state) const {
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if (!HasSufficientInputForAdaptation(input_state)) {
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return Adaptation::Status::kInsufficientInput;
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}
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// Don't adapt if we're awaiting a previous adaptation to have an effect.
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if (awaiting_frame_size_change_ &&
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awaiting_frame_size_change_->pixels_increased &&
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degradation_preference_ == DegradationPreference::MAINTAIN_FRAMERATE &&
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input_state.frame_size_pixels().value() <=
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awaiting_frame_size_change_->frame_size_pixels) {
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return Adaptation::Status::kAwaitingPreviousAdaptation;
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}
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// Maybe propose targets based on degradation preference.
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switch (degradation_preference_) {
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case DegradationPreference::BALANCED: {
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// Attempt to increase target frame rate.
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RestrictionsOrState increase_frame_rate =
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IncreaseFramerate(input_state, current_restrictions_);
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if (absl::holds_alternative<RestrictionsWithCounters>(
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increase_frame_rate)) {
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return increase_frame_rate;
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}
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// else, increase resolution.
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ABSL_FALLTHROUGH_INTENDED;
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}
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case DegradationPreference::MAINTAIN_FRAMERATE: {
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// Attempt to increase pixel count.
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return IncreaseResolution(input_state, current_restrictions_);
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}
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case DegradationPreference::MAINTAIN_RESOLUTION: {
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// Scale up framerate.
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return IncreaseFramerate(input_state, current_restrictions_);
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}
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case DegradationPreference::DISABLED:
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return Adaptation::Status::kAdaptationDisabled;
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}
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RTC_CHECK_NOTREACHED();
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}
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Adaptation VideoStreamAdapter::GetAdaptationDown() {
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RTC_DCHECK_RUN_ON(&sequence_checker_);
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VideoStreamInputState input_state = input_state_provider_->InputState();
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++adaptation_validation_id_;
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RestrictionsOrState restrictions_or_state =
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GetAdaptationDownStep(input_state, current_restrictions_);
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if (MinPixelLimitReached(input_state)) {
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encoder_stats_observer_->OnMinPixelLimitReached();
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}
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// Check for min_fps
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if (degradation_preference_ == DegradationPreference::BALANCED &&
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absl::holds_alternative<RestrictionsWithCounters>(
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restrictions_or_state)) {
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restrictions_or_state = AdaptIfFpsDiffInsufficient(
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input_state,
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absl::get<RestrictionsWithCounters>(restrictions_or_state));
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}
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return RestrictionsOrStateToAdaptation(restrictions_or_state, input_state);
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}
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VideoStreamAdapter::RestrictionsOrState
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VideoStreamAdapter::AdaptIfFpsDiffInsufficient(
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const VideoStreamInputState& input_state,
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const RestrictionsWithCounters& restrictions) const {
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RTC_DCHECK_EQ(degradation_preference_, DegradationPreference::BALANCED);
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int frame_size_pixels = input_state.single_active_stream_pixels().value_or(
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input_state.frame_size_pixels().value());
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absl::optional<int> min_fps_diff =
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balanced_settings_.MinFpsDiff(frame_size_pixels);
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if (current_restrictions_.counters.fps_adaptations <
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restrictions.counters.fps_adaptations &&
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min_fps_diff && input_state.frames_per_second() > 0) {
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int fps_diff = input_state.frames_per_second() -
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restrictions.restrictions.max_frame_rate().value();
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if (fps_diff < min_fps_diff.value()) {
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return GetAdaptationDownStep(input_state, restrictions);
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}
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}
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return restrictions;
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}
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VideoStreamAdapter::RestrictionsOrState
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VideoStreamAdapter::GetAdaptationDownStep(
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const VideoStreamInputState& input_state,
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const RestrictionsWithCounters& current_restrictions) const {
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if (!HasSufficientInputForAdaptation(input_state)) {
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return Adaptation::Status::kInsufficientInput;
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}
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// Don't adapt if we're awaiting a previous adaptation to have an effect or
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// if we switched degradation preference.
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if (awaiting_frame_size_change_ &&
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!awaiting_frame_size_change_->pixels_increased &&
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degradation_preference_ == DegradationPreference::MAINTAIN_FRAMERATE &&
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input_state.frame_size_pixels().value() >=
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awaiting_frame_size_change_->frame_size_pixels) {
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return Adaptation::Status::kAwaitingPreviousAdaptation;
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}
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// Maybe propose targets based on degradation preference.
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switch (degradation_preference_) {
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case DegradationPreference::BALANCED: {
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// Try scale down framerate, if lower.
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RestrictionsOrState decrease_frame_rate =
|
|
DecreaseFramerate(input_state, current_restrictions);
|
|
if (absl::holds_alternative<RestrictionsWithCounters>(
|
|
decrease_frame_rate)) {
|
|
return decrease_frame_rate;
|
|
}
|
|
// else, decrease resolution.
|
|
ABSL_FALLTHROUGH_INTENDED;
|
|
}
|
|
case DegradationPreference::MAINTAIN_FRAMERATE: {
|
|
return DecreaseResolution(input_state, current_restrictions);
|
|
}
|
|
case DegradationPreference::MAINTAIN_RESOLUTION: {
|
|
return DecreaseFramerate(input_state, current_restrictions);
|
|
}
|
|
case DegradationPreference::DISABLED:
|
|
return Adaptation::Status::kAdaptationDisabled;
|
|
}
|
|
RTC_CHECK_NOTREACHED();
|
|
}
|
|
|
|
VideoStreamAdapter::RestrictionsOrState VideoStreamAdapter::DecreaseResolution(
|
|
const VideoStreamInputState& input_state,
|
|
const RestrictionsWithCounters& current_restrictions) {
|
|
int target_pixels =
|
|
GetLowerResolutionThan(input_state.frame_size_pixels().value());
|
|
// Use single active stream if set, this stream could be lower than the input.
|
|
int target_pixels_min =
|
|
GetLowerResolutionThan(input_state.single_active_stream_pixels().value_or(
|
|
input_state.frame_size_pixels().value()));
|
|
if (!CanDecreaseResolutionTo(target_pixels, target_pixels_min, input_state,
|
|
current_restrictions.restrictions)) {
|
|
return Adaptation::Status::kLimitReached;
|
|
}
|
|
RestrictionsWithCounters new_restrictions = current_restrictions;
|
|
RTC_LOG(LS_INFO) << "Scaling down resolution, max pixels: " << target_pixels;
|
|
new_restrictions.restrictions.set_max_pixels_per_frame(
|
|
target_pixels != std::numeric_limits<int>::max()
|
|
? absl::optional<size_t>(target_pixels)
|
|
: absl::nullopt);
|
|
new_restrictions.restrictions.set_target_pixels_per_frame(absl::nullopt);
|
|
++new_restrictions.counters.resolution_adaptations;
|
|
return new_restrictions;
|
|
}
|
|
|
|
VideoStreamAdapter::RestrictionsOrState VideoStreamAdapter::DecreaseFramerate(
|
|
const VideoStreamInputState& input_state,
|
|
const RestrictionsWithCounters& current_restrictions) const {
|
|
int max_frame_rate;
|
|
if (degradation_preference_ == DegradationPreference::MAINTAIN_RESOLUTION) {
|
|
max_frame_rate = GetLowerFrameRateThan(input_state.frames_per_second());
|
|
} else if (degradation_preference_ == DegradationPreference::BALANCED) {
|
|
int frame_size_pixels = input_state.single_active_stream_pixels().value_or(
|
|
input_state.frame_size_pixels().value());
|
|
max_frame_rate = balanced_settings_.MinFps(input_state.video_codec_type(),
|
|
frame_size_pixels);
|
|
} else {
|
|
RTC_DCHECK_NOTREACHED();
|
|
max_frame_rate = GetLowerFrameRateThan(input_state.frames_per_second());
|
|
}
|
|
if (!CanDecreaseFrameRateTo(max_frame_rate,
|
|
current_restrictions.restrictions)) {
|
|
return Adaptation::Status::kLimitReached;
|
|
}
|
|
RestrictionsWithCounters new_restrictions = current_restrictions;
|
|
max_frame_rate = std::max(kMinFrameRateFps, max_frame_rate);
|
|
RTC_LOG(LS_INFO) << "Scaling down framerate: " << max_frame_rate;
|
|
new_restrictions.restrictions.set_max_frame_rate(
|
|
max_frame_rate != std::numeric_limits<int>::max()
|
|
? absl::optional<double>(max_frame_rate)
|
|
: absl::nullopt);
|
|
++new_restrictions.counters.fps_adaptations;
|
|
return new_restrictions;
|
|
}
|
|
|
|
VideoStreamAdapter::RestrictionsOrState VideoStreamAdapter::IncreaseResolution(
|
|
const VideoStreamInputState& input_state,
|
|
const RestrictionsWithCounters& current_restrictions) {
|
|
int target_pixels = input_state.frame_size_pixels().value();
|
|
if (current_restrictions.counters.resolution_adaptations == 1) {
|
|
RTC_LOG(LS_INFO) << "Removing resolution down-scaling setting.";
|
|
target_pixels = std::numeric_limits<int>::max();
|
|
}
|
|
target_pixels = GetHigherResolutionThan(target_pixels);
|
|
if (!CanIncreaseResolutionTo(target_pixels,
|
|
current_restrictions.restrictions)) {
|
|
return Adaptation::Status::kLimitReached;
|
|
}
|
|
int max_pixels_wanted = GetIncreasedMaxPixelsWanted(target_pixels);
|
|
RestrictionsWithCounters new_restrictions = current_restrictions;
|
|
RTC_LOG(LS_INFO) << "Scaling up resolution, max pixels: "
|
|
<< max_pixels_wanted;
|
|
new_restrictions.restrictions.set_max_pixels_per_frame(
|
|
max_pixels_wanted != std::numeric_limits<int>::max()
|
|
? absl::optional<size_t>(max_pixels_wanted)
|
|
: absl::nullopt);
|
|
new_restrictions.restrictions.set_target_pixels_per_frame(
|
|
max_pixels_wanted != std::numeric_limits<int>::max()
|
|
? absl::optional<size_t>(target_pixels)
|
|
: absl::nullopt);
|
|
--new_restrictions.counters.resolution_adaptations;
|
|
RTC_DCHECK_GE(new_restrictions.counters.resolution_adaptations, 0);
|
|
return new_restrictions;
|
|
}
|
|
|
|
VideoStreamAdapter::RestrictionsOrState VideoStreamAdapter::IncreaseFramerate(
|
|
const VideoStreamInputState& input_state,
|
|
const RestrictionsWithCounters& current_restrictions) const {
|
|
int max_frame_rate;
|
|
if (degradation_preference_ == DegradationPreference::MAINTAIN_RESOLUTION) {
|
|
max_frame_rate = GetHigherFrameRateThan(input_state.frames_per_second());
|
|
} else if (degradation_preference_ == DegradationPreference::BALANCED) {
|
|
int frame_size_pixels = input_state.single_active_stream_pixels().value_or(
|
|
input_state.frame_size_pixels().value());
|
|
max_frame_rate = balanced_settings_.MaxFps(input_state.video_codec_type(),
|
|
frame_size_pixels);
|
|
// Temporary fix for cases when there are fewer framerate adaptation steps
|
|
// up than down. Make number of down/up steps equal.
|
|
if (max_frame_rate == std::numeric_limits<int>::max() &&
|
|
current_restrictions.counters.fps_adaptations > 1) {
|
|
// Do not unrestrict framerate to allow additional adaptation up steps.
|
|
RTC_LOG(LS_INFO) << "Modifying framerate due to remaining fps count.";
|
|
max_frame_rate -= current_restrictions.counters.fps_adaptations;
|
|
}
|
|
// In BALANCED, the max_frame_rate must be checked before proceeding. This
|
|
// is because the MaxFps might be the current Fps and so the balanced
|
|
// settings may want to scale up the resolution.
|
|
if (!CanIncreaseFrameRateTo(max_frame_rate,
|
|
current_restrictions.restrictions)) {
|
|
return Adaptation::Status::kLimitReached;
|
|
}
|
|
} else {
|
|
RTC_DCHECK_NOTREACHED();
|
|
max_frame_rate = GetHigherFrameRateThan(input_state.frames_per_second());
|
|
}
|
|
if (current_restrictions.counters.fps_adaptations == 1) {
|
|
RTC_LOG(LS_INFO) << "Removing framerate down-scaling setting.";
|
|
max_frame_rate = std::numeric_limits<int>::max();
|
|
}
|
|
if (!CanIncreaseFrameRateTo(max_frame_rate,
|
|
current_restrictions.restrictions)) {
|
|
return Adaptation::Status::kLimitReached;
|
|
}
|
|
RTC_LOG(LS_INFO) << "Scaling up framerate: " << max_frame_rate;
|
|
RestrictionsWithCounters new_restrictions = current_restrictions;
|
|
new_restrictions.restrictions.set_max_frame_rate(
|
|
max_frame_rate != std::numeric_limits<int>::max()
|
|
? absl::optional<double>(max_frame_rate)
|
|
: absl::nullopt);
|
|
--new_restrictions.counters.fps_adaptations;
|
|
RTC_DCHECK_GE(new_restrictions.counters.fps_adaptations, 0);
|
|
return new_restrictions;
|
|
}
|
|
|
|
Adaptation VideoStreamAdapter::GetAdaptDownResolution() {
|
|
RTC_DCHECK_RUN_ON(&sequence_checker_);
|
|
VideoStreamInputState input_state = input_state_provider_->InputState();
|
|
switch (degradation_preference_) {
|
|
case DegradationPreference::DISABLED:
|
|
return RestrictionsOrStateToAdaptation(
|
|
Adaptation::Status::kAdaptationDisabled, input_state);
|
|
case DegradationPreference::MAINTAIN_RESOLUTION:
|
|
return RestrictionsOrStateToAdaptation(Adaptation::Status::kLimitReached,
|
|
input_state);
|
|
case DegradationPreference::MAINTAIN_FRAMERATE:
|
|
return GetAdaptationDown();
|
|
case DegradationPreference::BALANCED: {
|
|
return RestrictionsOrStateToAdaptation(
|
|
GetAdaptDownResolutionStepForBalanced(input_state), input_state);
|
|
}
|
|
}
|
|
RTC_CHECK_NOTREACHED();
|
|
}
|
|
|
|
VideoStreamAdapter::RestrictionsOrState
|
|
VideoStreamAdapter::GetAdaptDownResolutionStepForBalanced(
|
|
const VideoStreamInputState& input_state) const {
|
|
// Adapt twice if the first adaptation did not decrease resolution.
|
|
auto first_step = GetAdaptationDownStep(input_state, current_restrictions_);
|
|
if (!absl::holds_alternative<RestrictionsWithCounters>(first_step)) {
|
|
return first_step;
|
|
}
|
|
auto first_restrictions = absl::get<RestrictionsWithCounters>(first_step);
|
|
if (first_restrictions.counters.resolution_adaptations >
|
|
current_restrictions_.counters.resolution_adaptations) {
|
|
return first_step;
|
|
}
|
|
// We didn't decrease resolution so force it; amend a resolution resuction
|
|
// to the existing framerate reduction in `first_restrictions`.
|
|
auto second_step = DecreaseResolution(input_state, first_restrictions);
|
|
if (absl::holds_alternative<RestrictionsWithCounters>(second_step)) {
|
|
return second_step;
|
|
}
|
|
// If the second step was not successful then settle for the first one.
|
|
return first_step;
|
|
}
|
|
|
|
void VideoStreamAdapter::ApplyAdaptation(
|
|
const Adaptation& adaptation,
|
|
rtc::scoped_refptr<Resource> resource) {
|
|
RTC_DCHECK_RUN_ON(&sequence_checker_);
|
|
RTC_DCHECK_EQ(adaptation.validation_id_, adaptation_validation_id_);
|
|
if (adaptation.status() != Adaptation::Status::kValid)
|
|
return;
|
|
// Remember the input pixels and fps of this adaptation. Used to avoid
|
|
// adapting again before this adaptation has had an effect.
|
|
if (DidIncreaseResolution(current_restrictions_.restrictions,
|
|
adaptation.restrictions())) {
|
|
awaiting_frame_size_change_.emplace(
|
|
true, adaptation.input_state().frame_size_pixels().value());
|
|
} else if (DidDecreaseResolution(current_restrictions_.restrictions,
|
|
adaptation.restrictions())) {
|
|
awaiting_frame_size_change_.emplace(
|
|
false, adaptation.input_state().frame_size_pixels().value());
|
|
} else {
|
|
awaiting_frame_size_change_ = absl::nullopt;
|
|
}
|
|
current_restrictions_ = {adaptation.restrictions(), adaptation.counters()};
|
|
BroadcastVideoRestrictionsUpdate(adaptation.input_state(), resource);
|
|
}
|
|
|
|
Adaptation VideoStreamAdapter::GetAdaptationTo(
|
|
const VideoAdaptationCounters& counters,
|
|
const VideoSourceRestrictions& restrictions) {
|
|
// Adapts up/down from the current levels so counters are equal.
|
|
RTC_DCHECK_RUN_ON(&sequence_checker_);
|
|
VideoStreamInputState input_state = input_state_provider_->InputState();
|
|
return Adaptation(adaptation_validation_id_, restrictions, counters,
|
|
input_state);
|
|
}
|
|
|
|
void VideoStreamAdapter::BroadcastVideoRestrictionsUpdate(
|
|
const VideoStreamInputState& input_state,
|
|
const rtc::scoped_refptr<Resource>& resource) {
|
|
RTC_DCHECK_RUN_ON(&sequence_checker_);
|
|
VideoSourceRestrictions filtered = FilterRestrictionsByDegradationPreference(
|
|
source_restrictions(), degradation_preference_);
|
|
if (last_filtered_restrictions_ == filtered) {
|
|
return;
|
|
}
|
|
for (auto* restrictions_listener : restrictions_listeners_) {
|
|
restrictions_listener->OnVideoSourceRestrictionsUpdated(
|
|
filtered, current_restrictions_.counters, resource,
|
|
source_restrictions());
|
|
}
|
|
last_video_source_restrictions_ = current_restrictions_.restrictions;
|
|
last_filtered_restrictions_ = filtered;
|
|
}
|
|
|
|
bool VideoStreamAdapter::HasSufficientInputForAdaptation(
|
|
const VideoStreamInputState& input_state) const {
|
|
return input_state.HasInputFrameSizeAndFramesPerSecond() &&
|
|
(degradation_preference_ !=
|
|
DegradationPreference::MAINTAIN_RESOLUTION ||
|
|
input_state.frames_per_second() >= kMinFrameRateFps);
|
|
}
|
|
|
|
VideoStreamAdapter::AwaitingFrameSizeChange::AwaitingFrameSizeChange(
|
|
bool pixels_increased,
|
|
int frame_size_pixels)
|
|
: pixels_increased(pixels_increased),
|
|
frame_size_pixels(frame_size_pixels) {}
|
|
|
|
absl::optional<uint32_t> VideoStreamAdapter::GetSingleActiveLayerPixels(
|
|
const VideoCodec& codec) {
|
|
int num_active = 0;
|
|
absl::optional<uint32_t> pixels;
|
|
if (codec.codecType == VideoCodecType::kVideoCodecVP9) {
|
|
for (int i = 0; i < codec.VP9().numberOfSpatialLayers; ++i) {
|
|
if (codec.spatialLayers[i].active) {
|
|
++num_active;
|
|
pixels = codec.spatialLayers[i].width * codec.spatialLayers[i].height;
|
|
}
|
|
}
|
|
} else {
|
|
for (int i = 0; i < codec.numberOfSimulcastStreams; ++i) {
|
|
if (codec.simulcastStream[i].active) {
|
|
++num_active;
|
|
pixels =
|
|
codec.simulcastStream[i].width * codec.simulcastStream[i].height;
|
|
}
|
|
}
|
|
}
|
|
return (num_active > 1) ? absl::nullopt : pixels;
|
|
}
|
|
|
|
} // namespace webrtc
|