/*
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* Copyright (c) 2012 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 "webrtc/common_video/video_render_frames.h"
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#include <assert.h>
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#include "webrtc/modules/include/module_common_types.h"
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#include "webrtc/system_wrappers/include/tick_util.h"
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#include "webrtc/system_wrappers/include/trace.h"
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namespace webrtc {
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const uint32_t KEventMaxWaitTimeMs = 200;
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const uint32_t kMinRenderDelayMs = 10;
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const uint32_t kMaxRenderDelayMs = 500;
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VideoRenderFrames::VideoRenderFrames()
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: render_delay_ms_(10) {
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}
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int32_t VideoRenderFrames::AddFrame(const VideoFrame& new_frame) {
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const int64_t time_now = TickTime::MillisecondTimestamp();
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// Drop old frames only when there are other frames in the queue, otherwise, a
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// really slow system never renders any frames.
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if (!incoming_frames_.empty() &&
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new_frame.render_time_ms() + KOldRenderTimestampMS < time_now) {
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WEBRTC_TRACE(kTraceWarning,
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kTraceVideoRenderer,
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-1,
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"%s: too old frame, timestamp=%u.",
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__FUNCTION__,
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new_frame.timestamp());
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return -1;
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}
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if (new_frame.render_time_ms() > time_now + KFutureRenderTimestampMS) {
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WEBRTC_TRACE(kTraceWarning, kTraceVideoRenderer, -1,
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"%s: frame too long into the future, timestamp=%u.",
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__FUNCTION__, new_frame.timestamp());
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return -1;
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}
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incoming_frames_.push_back(new_frame);
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return static_cast<int32_t>(incoming_frames_.size());
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}
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VideoFrame VideoRenderFrames::FrameToRender() {
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VideoFrame render_frame;
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// Get the newest frame that can be released for rendering.
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while (!incoming_frames_.empty() && TimeToNextFrameRelease() <= 0) {
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render_frame = incoming_frames_.front();
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incoming_frames_.pop_front();
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}
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return render_frame;
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}
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int32_t VideoRenderFrames::ReleaseAllFrames() {
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incoming_frames_.clear();
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return 0;
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}
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uint32_t VideoRenderFrames::TimeToNextFrameRelease() {
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if (incoming_frames_.empty()) {
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return KEventMaxWaitTimeMs;
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}
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const int64_t time_to_release = incoming_frames_.front().render_time_ms() -
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render_delay_ms_ -
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TickTime::MillisecondTimestamp();
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return time_to_release < 0 ? 0u : static_cast<uint32_t>(time_to_release);
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}
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int32_t VideoRenderFrames::SetRenderDelay(
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const uint32_t render_delay) {
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if (render_delay < kMinRenderDelayMs ||
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render_delay > kMaxRenderDelayMs) {
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WEBRTC_TRACE(kTraceWarning, kTraceVideoRenderer,
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-1, "%s(%d): Invalid argument.", __FUNCTION__,
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render_delay);
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return -1;
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}
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render_delay_ms_ = render_delay;
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return 0;
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}
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} // namespace webrtc
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