Reland of Injectable Obj-C video codecs

webrtc/sdk/objc/Framework/Classes/VideoToolbox/objc_video_decoder_factory.mm

+/*
+ *  Copyright 2017 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 "webrtc/sdk/objc/Framework/Classes/VideoToolbox/objc_video_decoder_factory.h"
+
+#import "RTCVideoCodec+Private.h"
+#import "WebRTC/RTCVideoCodec.h"
+#import "WebRTC/RTCVideoCodecFactory.h"
+#import "WebRTC/RTCVideoCodecH264.h"
+#import "WebRTC/RTCVideoFrame.h"
+#import "WebRTC/RTCVideoFrameBuffer.h"
+
+#include "webrtc/api/video_codecs/video_decoder.h"
+#include "webrtc/modules/include/module_common_types.h"
+#include "webrtc/modules/video_coding/include/video_codec_interface.h"
+#include "webrtc/modules/video_coding/include/video_error_codes.h"
+#include "webrtc/rtc_base/logging.h"
+#include "webrtc/rtc_base/timeutils.h"
+#include "webrtc/sdk/objc/Framework/Classes/Video/objc_frame_buffer.h"
+
+namespace webrtc {
+
+namespace {
+class ObjCVideoDecoder : public VideoDecoder {
+ public:
+  ObjCVideoDecoder(id<RTCVideoDecoder> decoder) : decoder_(decoder) {}
+  ~ObjCVideoDecoder() { [decoder_ destroy]; }
+
+  int32_t InitDecode(const VideoCodec *codec_settings, int32_t number_of_cores) {
+    RTCVideoEncoderSettings *settings =
+        [[RTCVideoEncoderSettings alloc] initWithVideoCodec:codec_settings];
+    return [decoder_ startDecodeWithSettings:settings numberOfCores:number_of_cores];
+  }
+
+  int32_t Decode(const EncodedImage &input_image,
+                 bool missing_frames,
+                 const RTPFragmentationHeader *fragmentation,
+                 const CodecSpecificInfo *codec_specific_info = NULL,
+                 int64_t render_time_ms = -1) {
+    RTCEncodedImage *encodedImage =
+        [[RTCEncodedImage alloc] initWithNativeEncodedImage:input_image];
+    RTCRtpFragmentationHeader *header =
+        [[RTCRtpFragmentationHeader alloc] initWithFragmentationHeader:fragmentation];
+
+    // webrtc::CodecSpecificInfo only handles a hard coded list of codecs
+    id<RTCCodecSpecificInfo> rtcCodecSpecificInfo = nil;
+    if (codec_specific_info) {
+      if (codec_specific_info->codecType == kVideoCodecH264) {
+        RTCCodecSpecificInfoH264 *h264Info = [[RTCCodecSpecificInfoH264 alloc] init];
+        h264Info.packetizationMode =
+            (RTCH264PacketizationMode)codec_specific_info->codecSpecific.H264.packetization_mode;
+        rtcCodecSpecificInfo = h264Info;
+      }
+    }
+
+    return [decoder_ decode:encodedImage
+              missingFrames:missing_frames
+        fragmentationHeader:header
+          codecSpecificInfo:rtcCodecSpecificInfo
+               renderTimeMs:render_time_ms];
+  }
+
+  int32_t RegisterDecodeCompleteCallback(DecodedImageCallback *callback) {
+    [decoder_ setCallback:^(RTCVideoFrame *frame) {
+      const rtc::scoped_refptr<VideoFrameBuffer> buffer =
+          new rtc::RefCountedObject<ObjCFrameBuffer>(frame.buffer);
+      VideoFrame videoFrame(buffer,
+                            (uint32_t)(frame.timeStampNs / rtc::kNumNanosecsPerMicrosec),
+                            0,
+                            (VideoRotation)frame.rotation);
+      videoFrame.set_timestamp(frame.timeStamp);
+
+      callback->Decoded(videoFrame);
+    }];
+
+    return WEBRTC_VIDEO_CODEC_OK;
+  }
+
+  int32_t Release() { return [decoder_ releaseDecoder]; }
+
+ private:
+  id<RTCVideoDecoder> decoder_;
+};
+}  // namespace
+
+ObjCVideoDecoderFactory::ObjCVideoDecoderFactory(id<RTCVideoDecoderFactory> decoder_factory)
+    : decoder_factory_(decoder_factory) {}
+
+ObjCVideoDecoderFactory::~ObjCVideoDecoderFactory() {}
+
+id<RTCVideoDecoderFactory> ObjCVideoDecoderFactory::wrapped_decoder_factory() const {
+  return decoder_factory_;
+}
+
+VideoDecoder *ObjCVideoDecoderFactory::CreateVideoDecoder(VideoCodecType type) {
+  const rtc::Optional<const char *> codec_name = CodecTypeToPayloadName(type);
+  if (!codec_name) {
+    LOG(LS_ERROR) << "Invalid codec type: " << type;
+    return nullptr;
+  }
+
+  NSString *codecName = [NSString stringWithUTF8String:codec_name.value()];
+  for (RTCVideoCodecInfo *codecInfo in decoder_factory_.supportedCodecs) {
+    if ([codecName isEqualToString:codecInfo.name]) {
+      id<RTCVideoDecoder> decoder = [decoder_factory_ createDecoder:codecInfo];
+      return new ObjCVideoDecoder(decoder);
+    }
+  }
+
+  return nullptr;
+}
+
+void ObjCVideoDecoderFactory::DestroyVideoDecoder(VideoDecoder *decoder) {
+  delete decoder;
+  decoder = nullptr;
+}
+
+}  // namespace webrtc