iOS HW H264 support.

webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_encoder.h

Index: webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_encoder.h
diff --git a/webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_encoder.h b/webrtc/modules/video_coding/codecs/h264/h264_video_toolbox_encoder.h
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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.
+ *
+ */
+
+#ifndef WEBRTC_MODULES_VIDEO_CODING_CODECS_H264_H264_VIDEO_TOOLBOX_ENCODER_H_
+#define WEBRTC_MODULES_VIDEO_CODING_CODECS_H264_H264_VIDEO_TOOLBOX_ENCODER_H_
+
+#include "webrtc/modules/video_coding/codecs/h264/include/h264.h"
+
+#if defined(WEBRTC_VIDEO_TOOLBOX_SUPPORTED)
+
+#include <VideoToolbox/VideoToolbox.h>
+#include <vector>
+
+// 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 H264VideoToolboxEncoder : public H264Encoder {
+ public:
+  H264VideoToolboxEncoder();
+
+  ~H264VideoToolboxEncoder() override;
+
+  int InitEncode(const VideoCodec* codec_settings,
+                 int number_of_cores,
+                 size_t max_payload_size) override;
+
+  int Encode(const VideoFrame& input_image,
+             const CodecSpecificInfo* codec_specific_info,
+             const std::vector<VideoFrameType>* frame_types) override;
+
+  int RegisterEncodeCompleteCallback(EncodedImageCallback* callback) override;
+
+  int SetChannelParameters(uint32_t packet_loss, int64_t rtt) override;
+
+  int SetRates(uint32_t new_bitrate_kbit, uint32_t frame_rate) override;
+
+  int Release() override;
+
+ private:
+  int ResetCompressionSession();
+  void ConfigureCompressionSession();
+  void DestroyCompressionSession();
+
+  webrtc::EncodedImageCallback* callback_;
+  VTCompressionSessionRef compression_session_;
+  int32_t bitrate_;  // Bitrate in bits per second.
+  int32_t width_;
+  int32_t height_;
+};  // H264VideoToolboxEncoder
+
+}  // namespace webrtc
+
+#endif  // defined(WEBRTC_VIDEO_TOOLBOX_SUPPORTED)
+#endif  // WEBRTC_MODULES_VIDEO_CODING_CODECS_H264_H264_VIDEO_TOOLBOX_ENCODER_H_