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/*
* Copyright (c) 2015 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_coding/codecs/vp9/vp9_frame_buffer_pool.h"
#include "vpx/vpx_codec.h"
#include "vpx/vpx_decoder.h"
#include "vpx/vpx_frame_buffer.h"
#include "webrtc/base/checks.h"
#include "webrtc/system_wrappers/include/logging.h"
namespace webrtc {
uint8_t* Vp9FrameBufferPool::Vp9FrameBuffer::GetData() {
return data_.data<uint8_t>();
}
size_t Vp9FrameBufferPool::Vp9FrameBuffer::GetDataSize() const {
return data_.size();
}
void Vp9FrameBufferPool::Vp9FrameBuffer::SetSize(size_t size) {
data_.SetSize(size);
}
bool Vp9FrameBufferPool::InitializeVpxUsePool(
vpx_codec_ctx* vpx_codec_context) {
RTC_DCHECK(vpx_codec_context);
// Tell libvpx to use this pool.
if (vpx_codec_set_frame_buffer_functions(
// In which context to use these callback functions.
vpx_codec_context,
// Called by libvpx when it needs another frame buffer.
&Vp9FrameBufferPool::VpxGetFrameBuffer,
// Called by libvpx when it no longer uses a frame buffer.
&Vp9FrameBufferPool::VpxReleaseFrameBuffer,
// |this| will be passed as |user_priv| to VpxGetFrameBuffer.
this)) {
// Failed to configure libvpx to use Vp9FrameBufferPool.
return false;
}
return true;
}
rtc::scoped_refptr<Vp9FrameBufferPool::Vp9FrameBuffer>
Vp9FrameBufferPool::GetFrameBuffer(size_t min_size) {
RTC_DCHECK_GT(min_size, 0u);
rtc::scoped_refptr<Vp9FrameBuffer> available_buffer = nullptr;
{
rtc::CritScope cs(&buffers_lock_);
// Do we have a buffer we can recycle?
for (const auto& buffer : allocated_buffers_) {
if (buffer->HasOneRef()) {
available_buffer = buffer;
break;
}
}
// Otherwise create one.
if (available_buffer == nullptr) {
available_buffer = new rtc::RefCountedObject<Vp9FrameBuffer>();
allocated_buffers_.push_back(available_buffer);
if (allocated_buffers_.size() > max_num_buffers_) {
LOG(LS_WARNING)
<< allocated_buffers_.size() << " Vp9FrameBuffers have been "
<< "allocated by a Vp9FrameBufferPool (exceeding what is "
<< "considered reasonable, " << max_num_buffers_ << ").";
RTC_NOTREACHED();
}
}
}
available_buffer->SetSize(min_size);
return available_buffer;
}
int Vp9FrameBufferPool::GetNumBuffersInUse() const {
int num_buffers_in_use = 0;
rtc::CritScope cs(&buffers_lock_);
for (const auto& buffer : allocated_buffers_) {
if (!buffer->HasOneRef())
++num_buffers_in_use;
}
return num_buffers_in_use;
}
void Vp9FrameBufferPool::ClearPool() {
rtc::CritScope cs(&buffers_lock_);
allocated_buffers_.clear();
}
// static
int32_t Vp9FrameBufferPool::VpxGetFrameBuffer(void* user_priv,
size_t min_size,
vpx_codec_frame_buffer* fb) {
RTC_DCHECK(user_priv);
RTC_DCHECK(fb);
Vp9FrameBufferPool* pool = static_cast<Vp9FrameBufferPool*>(user_priv);
rtc::scoped_refptr<Vp9FrameBuffer> buffer = pool->GetFrameBuffer(min_size);
fb->data = buffer->GetData();
fb->size = buffer->GetDataSize();
// Store Vp9FrameBuffer* in |priv| for use in VpxReleaseFrameBuffer.
// This also makes vpx_codec_get_frame return images with their |fb_priv| set
// to |buffer| which is important for external reference counting.
// Release from refptr so that the buffer's |ref_count_| remains 1 when
// |buffer| goes out of scope.
fb->priv = static_cast<void*>(buffer.release());
return 0;
}
// static
int32_t Vp9FrameBufferPool::VpxReleaseFrameBuffer(void* user_priv,
vpx_codec_frame_buffer* fb) {
RTC_DCHECK(user_priv);
RTC_DCHECK(fb);
Vp9FrameBuffer* buffer = static_cast<Vp9FrameBuffer*>(fb->priv);
if (buffer != nullptr) {
buffer->Release();
// When libvpx fails to decode and you continue to try to decode (and fail)
// libvpx can for some reason try to release the same buffer multiple times.
// Setting |priv| to null protects against trying to Release multiple times.
fb->priv = nullptr;
}
return 0;
}
} // namespace webrtc
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