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/*
* 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/modules/video_render/video_render_frames.h"
#include <assert.h>
#include "webrtc/common_video/interface/texture_video_frame.h"
#include "webrtc/modules/interface/module_common_types.h"
#include "webrtc/system_wrappers/interface/tick_util.h"
#include "webrtc/system_wrappers/interface/trace.h"
namespace webrtc {
const uint32_t KEventMaxWaitTimeMs = 200;
const uint32_t kMinRenderDelayMs = 10;
const uint32_t kMaxRenderDelayMs= 500;
VideoRenderFrames::VideoRenderFrames()
: render_delay_ms_(10) {
}
VideoRenderFrames::~VideoRenderFrames() {
ReleaseAllFrames();
}
int32_t VideoRenderFrames::AddFrame(I420VideoFrame* new_frame) {
const int64_t time_now = TickTime::MillisecondTimestamp();
// 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;
}
if (new_frame->native_handle() != NULL) {
incoming_frames_.push_back(new_frame->CloneFrame());
return static_cast<int32_t>(incoming_frames_.size());
}
// Get an empty frame
I420VideoFrame* frame_to_add = NULL;
if (!empty_frames_.empty()) {
frame_to_add = empty_frames_.front();
empty_frames_.pop_front();
}
if (!frame_to_add) {
if (empty_frames_.size() + incoming_frames_.size() >
KMaxNumberOfFrames) {
// Already allocated too many frames.
WEBRTC_TRACE(kTraceWarning, kTraceVideoRenderer,
-1, "%s: too many frames, timestamp=%u, limit=%d",
__FUNCTION__, new_frame->timestamp(), KMaxNumberOfFrames);
return -1;
}
// Allocate new memory.
WEBRTC_TRACE(kTraceMemory, kTraceVideoRenderer, -1,
"%s: allocating buffer %d", __FUNCTION__,
empty_frames_.size() + incoming_frames_.size());
frame_to_add = new I420VideoFrame();
if (!frame_to_add) {
WEBRTC_TRACE(kTraceError, kTraceVideoRenderer, -1,
"%s: could not create new frame for", __FUNCTION__);
return -1;
}
}
frame_to_add->CreateEmptyFrame(new_frame->width(), new_frame->height(),
new_frame->stride(kYPlane),
new_frame->stride(kUPlane),
new_frame->stride(kVPlane));
// TODO(mflodman) Change this!
// Remove const ness. Copying will be costly.
frame_to_add->SwapFrame(new_frame);
incoming_frames_.push_back(frame_to_add);
return static_cast<int32_t>(incoming_frames_.size());
}
I420VideoFrame* VideoRenderFrames::FrameToRender() {
I420VideoFrame* render_frame = NULL;
FrameList::iterator iter = incoming_frames_.begin();
while(iter != incoming_frames_.end()) {
I420VideoFrame* oldest_frame_in_list = *iter;
if (oldest_frame_in_list->render_time_ms() <=
TickTime::MillisecondTimestamp() + render_delay_ms_) {
// This is the oldest one so far and it's OK to render.
if (render_frame) {
// This one is older than the newly found frame, remove this one.
ReturnFrame(render_frame);
}
render_frame = oldest_frame_in_list;
iter = incoming_frames_.erase(iter);
} else {
// We can't release this one yet, we're done here.
break;
}
}
return render_frame;
}
int32_t VideoRenderFrames::ReturnFrame(I420VideoFrame* old_frame) {
// No need to reuse texture frames because they do not allocate memory.
if (old_frame->native_handle() == NULL) {
old_frame->ResetSize();
old_frame->set_timestamp(0);
old_frame->set_render_time_ms(0);
empty_frames_.push_back(old_frame);
} else {
delete old_frame;
}
return 0;
}
int32_t VideoRenderFrames::ReleaseAllFrames() {
for (FrameList::iterator iter = incoming_frames_.begin();
iter != incoming_frames_.end(); ++iter) {
delete *iter;
}
incoming_frames_.clear();
for (FrameList::iterator iter = empty_frames_.begin();
iter != empty_frames_.end(); ++iter) {
delete *iter;
}
empty_frames_.clear();
return 0;
}
uint32_t VideoRenderFrames::TimeToNextFrameRelease() {
if (incoming_frames_.empty()) {
return KEventMaxWaitTimeMs;
}
I420VideoFrame* oldest_frame = incoming_frames_.front();
int64_t time_to_release = oldest_frame->render_time_ms() - render_delay_ms_
- TickTime::MillisecondTimestamp();
if (time_to_release < 0) {
time_to_release = 0;
}
return static_cast<uint32_t>(time_to_release);
}
int32_t VideoRenderFrames::SetRenderDelay(
const uint32_t render_delay) {
if (render_delay < kMinRenderDelayMs ||
render_delay > kMaxRenderDelayMs) {
WEBRTC_TRACE(kTraceWarning, kTraceVideoRenderer,
-1, "%s(%d): Invalid argument.", __FUNCTION__,
render_delay);
return -1;
}
render_delay_ms_ = render_delay;
return 0;
}
} // namespace webrtc
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