iOS HW H264 support.

webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_decoder.h

+/*
+ *  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.
+ *
+ */
+
+#ifndef WEBRTC_MODULES_VIDEO_CODING_CODECS_H264_H264_VIDEO_TOOLBOX_DECODER_H_
+#define WEBRTC_MODULES_VIDEO_CODING_CODECS_H264_H264_VIDEO_TOOLBOX_DECODER_H_
+
+#include "webrtc/modules/video_coding/codecs/h264/include/h264.h"
+
+#if defined(WEBRTC_VIDEO_TOOLBOX_SUPPORTED)
+
+#include <VideoToolbox/VideoToolbox.h>
+
+// This file provides a H264 encoder implementation using the VideoToolbox
+// APIs. Since documentation is almost non-existent, this is largely based on
+// the information in the VideoToolbox header files, a talk from WWDC 2014 and
+// experimentation.
+
+namespace webrtc {
+
+class H264VideoToolboxDecoder : public H264Decoder {
+ public:
+  H264VideoToolboxDecoder();
+
+  ~H264VideoToolboxDecoder() override;
+
+  int InitDecode(const VideoCodec* video_codec, int number_of_cores) override;
+
+  int Decode(const EncodedImage& input_image,
+             bool missing_frames,
+             const RTPFragmentationHeader* fragmentation,
+             const CodecSpecificInfo* codec_specific_info,
+             int64_t render_time_ms) override;
+
+  int RegisterDecodeCompleteCallback(DecodedImageCallback* callback) override;
+
+  int Release() override;
+
+  int Reset() override;
+
+ private:
+  int ResetDecompressionSession();
+  void ConfigureDecompressionSession();
+  void DestroyDecompressionSession();
+  void SetVideoFormat(CMVideoFormatDescriptionRef video_format);
+
+  DecodedImageCallback* callback_;
+  CMVideoFormatDescriptionRef video_format_;
+  VTDecompressionSessionRef decompression_session_;
+};  // H264VideoToolboxDecoder
+
+}  // namespace webrtc
+
+#endif  // defined(WEBRTC_VIDEO_TOOLBOX_SUPPORTED)
+#endif  // WEBRTC_MODULES_VIDEO_CODING_CODECS_H264_H264_VIDEO_TOOLBOX_DECODER_H_