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/*
* Copyright (c) 2022 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "video/frame_decode_timing.h"
#include <algorithm>
#include "absl/types/optional.h"
#include "api/units/time_delta.h"
#include "rtc_base/logging.h"
namespace webrtc {
FrameDecodeTiming::FrameDecodeTiming(Clock* clock,
webrtc::VCMTiming const* timing)
: clock_(clock), timing_(timing) {
RTC_DCHECK(clock_);
RTC_DCHECK(timing_);
}
absl::optional<FrameDecodeTiming::FrameSchedule>
FrameDecodeTiming::OnFrameBufferUpdated(uint32_t next_temporal_unit_rtp,
uint32_t last_temporal_unit_rtp,
TimeDelta max_wait_for_frame,
bool too_many_frames_queued) {
RTC_DCHECK_GE(max_wait_for_frame, TimeDelta::Zero());
const Timestamp now = clock_->CurrentTime();
Timestamp render_time = timing_->RenderTime(next_temporal_unit_rtp, now);
TimeDelta max_wait =
timing_->MaxWaitingTime(render_time, now, too_many_frames_queued);
// If the delay is not too far in the past, or this is the last decodable
// frame then it is the best frame to be decoded. Otherwise, fast-forward
// to the next frame in the buffer.
if (max_wait <= -kMaxAllowedFrameDelay &&
next_temporal_unit_rtp != last_temporal_unit_rtp) {
RTC_DLOG(LS_VERBOSE) << "Fast-forwarded frame " << next_temporal_unit_rtp
<< " render time " << render_time << " with delay "
<< max_wait;
return absl::nullopt;
}
max_wait.Clamp(TimeDelta::Zero(), max_wait_for_frame);
RTC_DLOG(LS_VERBOSE) << "Selected frame with rtp " << next_temporal_unit_rtp
<< " render time " << render_time
<< " with a max wait of " << max_wait_for_frame
<< " clamped to " << max_wait;
Timestamp latest_decode_time = now + max_wait;
return FrameSchedule{.latest_decode_time = latest_decode_time,
.render_time = render_time};
}
} // namespace webrtc
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