61 lines
2.4 KiB
C++
61 lines
2.4 KiB
C++
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/*
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* Copyright (c) 2022 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 "video/frame_decode_timing.h"
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#include <algorithm>
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#include "absl/types/optional.h"
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#include "api/units/time_delta.h"
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#include "rtc_base/logging.h"
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namespace webrtc {
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FrameDecodeTiming::FrameDecodeTiming(Clock* clock,
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webrtc::VCMTiming const* timing)
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: clock_(clock), timing_(timing) {
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RTC_DCHECK(clock_);
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RTC_DCHECK(timing_);
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}
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absl::optional<FrameDecodeTiming::FrameSchedule>
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FrameDecodeTiming::OnFrameBufferUpdated(uint32_t next_temporal_unit_rtp,
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uint32_t last_temporal_unit_rtp,
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TimeDelta max_wait_for_frame,
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bool too_many_frames_queued) {
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RTC_DCHECK_GE(max_wait_for_frame, TimeDelta::Zero());
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const Timestamp now = clock_->CurrentTime();
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Timestamp render_time = timing_->RenderTime(next_temporal_unit_rtp, now);
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TimeDelta max_wait =
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timing_->MaxWaitingTime(render_time, now, too_many_frames_queued);
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// If the delay is not too far in the past, or this is the last decodable
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// frame then it is the best frame to be decoded. Otherwise, fast-forward
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// to the next frame in the buffer.
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if (max_wait <= -kMaxAllowedFrameDelay &&
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next_temporal_unit_rtp != last_temporal_unit_rtp) {
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RTC_DLOG(LS_VERBOSE) << "Fast-forwarded frame " << next_temporal_unit_rtp
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<< " render time " << render_time << " with delay "
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<< max_wait;
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return absl::nullopt;
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}
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max_wait.Clamp(TimeDelta::Zero(), max_wait_for_frame);
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RTC_DLOG(LS_VERBOSE) << "Selected frame with rtp " << next_temporal_unit_rtp
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<< " render time " << render_time
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<< " with a max wait of " << max_wait_for_frame
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<< " clamped to " << max_wait;
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Timestamp latest_decode_time = now + max_wait;
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return FrameSchedule{.latest_decode_time = latest_decode_time,
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.render_time = render_time};
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}
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} // namespace webrtc
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