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