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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 "common_video/include/video_frame_buffer_pool.h"
#include <limits>
#include "rtc_base/checks.h"
namespace webrtc {
namespace {
bool HasOneRef(const rtc::scoped_refptr<VideoFrameBuffer>& buffer) {
// Cast to rtc::RefCountedObject is safe because this function is only called
// on locally created VideoFrameBuffers, which are either
// |rtc::RefCountedObject<I420Buffer>| or |rtc::RefCountedObject<NV12Buffer>|.
switch (buffer->type()) {
case VideoFrameBuffer::Type::kI420: {
return static_cast<rtc::RefCountedObject<I420Buffer>*>(buffer.get())
->HasOneRef();
}
case VideoFrameBuffer::Type::kNV12: {
return static_cast<rtc::RefCountedObject<NV12Buffer>*>(buffer.get())
->HasOneRef();
}
default:
RTC_NOTREACHED();
}
return false;
}
} // namespace
VideoFrameBufferPool::VideoFrameBufferPool() : VideoFrameBufferPool(false) {}
VideoFrameBufferPool::VideoFrameBufferPool(bool zero_initialize)
: VideoFrameBufferPool(zero_initialize,
std::numeric_limits<size_t>::max()) {}
VideoFrameBufferPool::VideoFrameBufferPool(bool zero_initialize,
size_t max_number_of_buffers)
: zero_initialize_(zero_initialize),
max_number_of_buffers_(max_number_of_buffers) {}
VideoFrameBufferPool::~VideoFrameBufferPool() = default;
void VideoFrameBufferPool::Release() {
buffers_.clear();
}
bool VideoFrameBufferPool::Resize(size_t max_number_of_buffers) {
RTC_DCHECK_RUNS_SERIALIZED(&race_checker_);
size_t used_buffers_count = 0;
for (const rtc::scoped_refptr<VideoFrameBuffer>& buffer : buffers_) {
// If the buffer is in use, the ref count will be >= 2, one from the list we
// are looping over and one from the application. If the ref count is 1,
// then the list we are looping over holds the only reference and it's safe
// to reuse.
if (!HasOneRef(buffer)) {
used_buffers_count++;
}
}
if (used_buffers_count > max_number_of_buffers) {
return false;
}
max_number_of_buffers_ = max_number_of_buffers;
size_t buffers_to_purge = buffers_.size() - max_number_of_buffers_;
auto iter = buffers_.begin();
while (iter != buffers_.end() && buffers_to_purge > 0) {
if (HasOneRef(*iter)) {
iter = buffers_.erase(iter);
buffers_to_purge--;
} else {
++iter;
}
}
return true;
}
rtc::scoped_refptr<I420Buffer> VideoFrameBufferPool::CreateI420Buffer(
int width,
int height) {
RTC_DCHECK_RUNS_SERIALIZED(&race_checker_);
rtc::scoped_refptr<VideoFrameBuffer> existing_buffer =
GetExistingBuffer(width, height, VideoFrameBuffer::Type::kI420);
if (existing_buffer) {
// Cast is safe because the only way kI420 buffer is created is
// in the same function below, where |RefCountedObject<I420Buffer>| is
// created.
rtc::RefCountedObject<I420Buffer>* raw_buffer =
static_cast<rtc::RefCountedObject<I420Buffer>*>(existing_buffer.get());
// Creates a new scoped_refptr, which is also pointing to the same
// RefCountedObject as buffer, increasing ref count.
return rtc::scoped_refptr<I420Buffer>(raw_buffer);
}
if (buffers_.size() >= max_number_of_buffers_)
return nullptr;
// Allocate new buffer.
rtc::scoped_refptr<I420Buffer> buffer =
new rtc::RefCountedObject<I420Buffer>(width, height);
if (zero_initialize_)
buffer->InitializeData();
buffers_.push_back(buffer);
return buffer;
}
rtc::scoped_refptr<NV12Buffer> VideoFrameBufferPool::CreateNV12Buffer(
int width,
int height) {
RTC_DCHECK_RUNS_SERIALIZED(&race_checker_);
rtc::scoped_refptr<VideoFrameBuffer> existing_buffer =
GetExistingBuffer(width, height, VideoFrameBuffer::Type::kNV12);
if (existing_buffer) {
// Cast is safe because the only way kI420 buffer is created is
// in the same function below, where |RefCountedObject<I420Buffer>| is
// created.
rtc::RefCountedObject<NV12Buffer>* raw_buffer =
static_cast<rtc::RefCountedObject<NV12Buffer>*>(existing_buffer.get());
// Creates a new scoped_refptr, which is also pointing to the same
// RefCountedObject as buffer, increasing ref count.
return rtc::scoped_refptr<NV12Buffer>(raw_buffer);
}
if (buffers_.size() >= max_number_of_buffers_)
return nullptr;
// Allocate new buffer.
rtc::scoped_refptr<NV12Buffer> buffer =
new rtc::RefCountedObject<NV12Buffer>(width, height);
if (zero_initialize_)
buffer->InitializeData();
buffers_.push_back(buffer);
return buffer;
}
rtc::scoped_refptr<VideoFrameBuffer> VideoFrameBufferPool::GetExistingBuffer(
int width,
int height,
VideoFrameBuffer::Type type) {
// Release buffers with wrong resolution or different type.
for (auto it = buffers_.begin(); it != buffers_.end();) {
const auto& buffer = *it;
if (buffer->width() != width || buffer->height() != height ||
buffer->type() != type) {
it = buffers_.erase(it);
} else {
++it;
}
}
// Look for a free buffer.
for (const rtc::scoped_refptr<VideoFrameBuffer>& buffer : buffers_) {
// If the buffer is in use, the ref count will be >= 2, one from the list we
// are looping over and one from the application. If the ref count is 1,
// then the list we are looping over holds the only reference and it's safe
// to reuse.
if (HasOneRef(buffer)) {
RTC_CHECK(buffer->type() == type);
return buffer;
}
}
return nullptr;
}
} // namespace webrtc
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