Add content type information to encoded images and corresponding rtp extension header

webrtc/modules/video_coding/generic_decoder.cc

 /*
  *  Copyright (c) 2012 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.
  */
 
@@ skipping 69 matching lines @@
   if (!decode_time_ms) {
     decode_time_ms =
         rtc::Optional<int32_t>(now_ms - frameInfo->decodeStartTimeMs);
   }
   _timing->StopDecodeTimer(decodedImage.timestamp(), *decode_time_ms, now_ms,
                            frameInfo->renderTimeMs);
 
   decodedImage.set_timestamp_us(
       frameInfo->renderTimeMs * rtc::kNumMicrosecsPerMillisec);
   decodedImage.set_rotation(frameInfo->rotation);
+  decodedImage.set_content_type(frameInfo->content_type);
   _receiveCallback->FrameToRender(decodedImage, qp);
 }
 
 int32_t VCMDecodedFrameCallback::ReceivedDecodedReferenceFrame(
     const uint64_t pictureId) {
   return _receiveCallback->ReceivedDecodedReferenceFrame(pictureId);
 }
 
 int32_t VCMDecodedFrameCallback::ReceivedDecodedFrame(
     const uint64_t pictureId) {
@@ skipping 24 matching lines @@
   return VCM_OK;
 }
 
 VCMGenericDecoder::VCMGenericDecoder(VideoDecoder* decoder, bool isExternal)
     : _callback(NULL),
       _frameInfos(),
       _nextFrameInfoIdx(0),
       _decoder(decoder),
       _codecType(kVideoCodecUnknown),
       _isExternal(isExternal),
-      _keyFrameDecoded(false) {}
+      _keyFrameDecoded(false),
+      _last_keyframe_content_type(VideoContentType::kDefault) {}
 
 VCMGenericDecoder::~VCMGenericDecoder() {}
 
 int32_t VCMGenericDecoder::InitDecode(const VideoCodec* settings,
                                       int32_t numberOfCores) {
   TRACE_EVENT0("webrtc", "VCMGenericDecoder::InitDecode");
   _codecType = settings->codecType;
 
   return _decoder->InitDecode(settings, numberOfCores);
 }
 
 int32_t VCMGenericDecoder::Decode(const VCMEncodedFrame& frame, int64_t nowMs) {
     TRACE_EVENT1("webrtc", "VCMGenericDecoder::Decode", "timestamp",
                  frame.EncodedImage()._timeStamp);
     _frameInfos[_nextFrameInfoIdx].decodeStartTimeMs = nowMs;
     _frameInfos[_nextFrameInfoIdx].renderTimeMs = frame.RenderTimeMs();
     _frameInfos[_nextFrameInfoIdx].rotation = frame.rotation();
+    // Set correctly only for key frames. Thus, use latest key frame
+    // content type. If the corresponding key frame was lost, decode will fail
+    // and content type will be ignored.
+    if (frame.FrameType() == kVideoFrameKey) {
+      _frameInfos[_nextFrameInfoIdx].content_type = frame.contentType();
+      _last_keyframe_content_type = frame.contentType();
+    } else {
+      _frameInfos[_nextFrameInfoIdx].content_type = _last_keyframe_content_type;
+    }
     _callback->Map(frame.TimeStamp(), &_frameInfos[_nextFrameInfoIdx]);
 
     _nextFrameInfoIdx = (_nextFrameInfoIdx + 1) % kDecoderFrameMemoryLength;
     const RTPFragmentationHeader dummy_header;
     int32_t ret = _decoder->Decode(frame.EncodedImage(), frame.MissingFrame(),
                                    &dummy_header,
                                    frame.CodecSpecific(), frame.RenderTimeMs());
 
     _callback->OnDecoderImplementationName(_decoder->ImplementationName());
     if (ret < WEBRTC_VIDEO_CODEC_OK) {
@@ skipping 21 matching lines @@
 
 bool VCMGenericDecoder::External() const {
   return _isExternal;
 }
 
 bool VCMGenericDecoder::PrefersLateDecoding() const {
   return _decoder->PrefersLateDecoding();
 }
 
 }  // namespace webrtc