Line data    Source code

       1             : /*
       2             :  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
       3             :  *
       4             :  *  Use of this source code is governed by a BSD-style license
       5             :  *  that can be found in the LICENSE file in the root of the source
       6             :  *  tree. An additional intellectual property rights grant can be found
       7             :  *  in the file PATENTS.  All contributing project authors may
       8             :  *  be found in the AUTHORS file in the root of the source tree.
       9             :  */
      10             : 
      11             : #include "webrtc/common_video/include/i420_buffer_pool.h"
      12             : 
      13             : #include "webrtc/base/checks.h"
      14             : 
      15             : namespace webrtc {
      16             : 
      17           0 : I420BufferPool::I420BufferPool(bool zero_initialize,
      18           0 :                                size_t max_number_of_buffers)
      19             :     : zero_initialize_(zero_initialize),
      20           0 :       max_number_of_buffers_(max_number_of_buffers) {}
      21             : 
      22           0 : void I420BufferPool::Release() {
      23           0 :   buffers_.clear();
      24           0 : }
      25             : 
      26           0 : rtc::scoped_refptr<I420Buffer> I420BufferPool::CreateBuffer(int width,
      27             :                                                             int height) {
      28           0 :   RTC_DCHECK_RUNS_SERIALIZED(&race_checker_);
      29             :   // Release buffers with wrong resolution.
      30           0 :   for (auto it = buffers_.begin(); it != buffers_.end();) {
      31           0 :     if ((*it)->width() != width || (*it)->height() != height)
      32           0 :       it = buffers_.erase(it);
      33             :     else
      34           0 :       ++it;
      35             :   }
      36             :   // Look for a free buffer.
      37           0 :   for (const rtc::scoped_refptr<PooledI420Buffer>& buffer : buffers_) {
      38             :     // If the buffer is in use, the ref count will be >= 2, one from the list we
      39             :     // are looping over and one from the application. If the ref count is 1,
      40             :     // then the list we are looping over holds the only reference and it's safe
      41             :     // to reuse.
      42           0 :     if (buffer->HasOneRef())
      43           0 :       return buffer;
      44             :   }
      45             : 
      46           0 :   if (buffers_.size() >= max_number_of_buffers_)
      47           0 :     return nullptr;
      48             :   // Allocate new buffer.
      49             :   rtc::scoped_refptr<PooledI420Buffer> buffer =
      50           0 :       new PooledI420Buffer(width, height);
      51           0 :   if (zero_initialize_)
      52           0 :     buffer->InitializeData();
      53           0 :   buffers_.push_back(buffer);
      54           0 :   return buffer;
      55             : }
      56             : 
      57             : }  // namespace webrtc