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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/base/video_frame_pool.h"
#include <list>
#include "base/bind.h"
#include "base/memory/ref_counted.h"
#include "base/synchronization/lock.h"
namespace media {
class VideoFramePool::PoolImpl
: public base::RefCountedThreadSafe<VideoFramePool::PoolImpl> {
public:
PoolImpl();
// Returns a frame from the pool that matches the specified
// parameters or creates a new frame if no suitable frame exists in
// the pool. The pool is drained if no matching frame is found.
scoped_refptr<VideoFrame> CreateFrame(VideoFrame::Format format,
const gfx::Size& coded_size,
const gfx::Rect& visible_rect,
const gfx::Size& natural_size,
base::TimeDelta timestamp);
// Shuts down the frame pool and releases all frames in |frames_|.
// Once this is called frames will no longer be inserted back into
// |frames_|.
void Shutdown();
size_t GetPoolSizeForTesting() const { return frames_.size(); }
private:
friend class base::RefCountedThreadSafe<VideoFramePool::PoolImpl>;
~PoolImpl();
// Called when the frame wrapper gets destroyed.
// |frame| is the actual frame that was wrapped and is placed
// in |frames_| by this function so it can be reused.
void FrameReleased(const scoped_refptr<VideoFrame>& frame);
base::Lock lock_;
bool is_shutdown_;
std::list<scoped_refptr<VideoFrame> > frames_;
DISALLOW_COPY_AND_ASSIGN(PoolImpl);
};
VideoFramePool::PoolImpl::PoolImpl() : is_shutdown_(false) {}
VideoFramePool::PoolImpl::~PoolImpl() {
DCHECK(is_shutdown_);
}
scoped_refptr<VideoFrame> VideoFramePool::PoolImpl::CreateFrame(
VideoFrame::Format format,
const gfx::Size& coded_size,
const gfx::Rect& visible_rect,
const gfx::Size& natural_size,
base::TimeDelta timestamp) {
base::AutoLock auto_lock(lock_);
DCHECK(!is_shutdown_);
scoped_refptr<VideoFrame> frame;
while (!frame && !frames_.empty()) {
scoped_refptr<VideoFrame> pool_frame = frames_.front();
frames_.pop_front();
if (pool_frame->format() == format &&
pool_frame->coded_size() == coded_size &&
pool_frame->visible_rect() == visible_rect &&
pool_frame->natural_size() == natural_size) {
frame = pool_frame;
frame->set_timestamp(timestamp);
break;
}
}
if (!frame) {
frame = VideoFrame::CreateFrame(
format, coded_size, visible_rect, natural_size, timestamp);
}
return VideoFrame::WrapVideoFrame(
frame, frame->visible_rect(), frame->natural_size(),
base::Bind(&VideoFramePool::PoolImpl::FrameReleased, this, frame));
}
void VideoFramePool::PoolImpl::Shutdown() {
base::AutoLock auto_lock(lock_);
is_shutdown_ = true;
frames_.clear();
}
void VideoFramePool::PoolImpl::FrameReleased(
const scoped_refptr<VideoFrame>& frame) {
base::AutoLock auto_lock(lock_);
if (is_shutdown_)
return;
frames_.push_back(frame);
}
VideoFramePool::VideoFramePool() : pool_(new PoolImpl()) {
}
VideoFramePool::~VideoFramePool() {
pool_->Shutdown();
}
scoped_refptr<VideoFrame> VideoFramePool::CreateFrame(
VideoFrame::Format format,
const gfx::Size& coded_size,
const gfx::Rect& visible_rect,
const gfx::Size& natural_size,
base::TimeDelta timestamp) {
return pool_->CreateFrame(format, coded_size, visible_rect, natural_size,
timestamp);
}
size_t VideoFramePool::GetPoolSizeForTesting() const {
return pool_->GetPoolSizeForTesting();
}
} // namespace media
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