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      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 
     12 #ifndef WEBRTC_MODULES_VIDEO_CODING_CODECS_H264_H264_VIDEO_TOOLBOX_DECODER_H_
     13 #define WEBRTC_MODULES_VIDEO_CODING_CODECS_H264_H264_VIDEO_TOOLBOX_DECODER_H_
     14 
     15 #include "webrtc/modules/video_coding/codecs/h264/include/h264.h"
     16 
     17 #if defined(WEBRTC_VIDEO_TOOLBOX_SUPPORTED)
     18 
     19 #include <VideoToolbox/VideoToolbox.h>
     20 
     21 // This file provides a H264 encoder implementation using the VideoToolbox
     22 // APIs. Since documentation is almost non-existent, this is largely based on
     23 // the information in the VideoToolbox header files, a talk from WWDC 2014 and
     24 // experimentation.
     25 
     26 namespace webrtc {
     27 
     28 class H264VideoToolboxDecoder : public H264Decoder {
     29  public:
     30   H264VideoToolboxDecoder();
     31 
     32   ~H264VideoToolboxDecoder() override;
     33 
     34   int InitDecode(const VideoCodec* video_codec, int number_of_cores) override;
     35 
     36   int Decode(const EncodedImage& input_image,
     37              bool missing_frames,
     38              const RTPFragmentationHeader* fragmentation,
     39              const CodecSpecificInfo* codec_specific_info,
     40              int64_t render_time_ms) override;
     41 
     42   int RegisterDecodeCompleteCallback(DecodedImageCallback* callback) override;
     43 
     44   int Release() override;
     45 
     46   int Reset() override;
     47 
     48   const char* ImplementationName() const override;
     49 
     50  private:
     51   int ResetDecompressionSession();
     52   void ConfigureDecompressionSession();
     53   void DestroyDecompressionSession();
     54   void SetVideoFormat(CMVideoFormatDescriptionRef video_format);
     55 
     56   DecodedImageCallback* callback_;
     57   CMVideoFormatDescriptionRef video_format_;
     58   VTDecompressionSessionRef decompression_session_;
     59 };  // H264VideoToolboxDecoder
     60 
     61 }  // namespace webrtc
     62 
     63 #endif  // defined(WEBRTC_VIDEO_TOOLBOX_SUPPORTED)
     64 #endif  // WEBRTC_MODULES_VIDEO_CODING_CODECS_H264_H264_VIDEO_TOOLBOX_DECODER_H_
     65