参考：WebRTC 接收到 offer 指令后流程分析与 jitterbuffer 数据到解码器的流程分析 | 码农家园
rtp_video_stream_receiver2.cc : OnReceivedPayloadData video_header.is_last_packet_in_frame |= rtp_packet.Marker();
video_rtp_depacketizer_h264.cc:
absl::optional<VideoRtpDepacketizer::ParsedRtpPayload>
VideoRtpDepacketizerH264::Parse(rtc::CopyOnWriteBuffer rtp_payload)
packet_buffer_.InsertPacket
OnInsertedPacket --- 组帧的结果到这里
rtp_video_stream_receiver2.cc : OnAssembledFrame
buffered_frame_decryptor.cc: ManageEncryptedFrame ->DecryptFrame
rtp_video_stream_receiver2.cc : OnDecryptedFrame
OnCompleteFrames
OnCompleteFrame
http://receive_statistics_proxy.cc 的 ReceiveStatisticsProxy::OnCompleteFrame
VideoStreamBufferController::InsertFrame -> stats_proxy_->OnCompleteFrame(metadata.is_keyframe, metadata.size,metadata.contentType); receiv:key+delta
void VideoStreamBufferController::MaybeScheduleFrameForRelease
这中间少了frame
VideoStreamBufferController::ForceKeyFrameReleaseImmediately()
VideoStreamBufferController::OnFrameReady
VideoReceiveStream2::OnEncodedFrame
VideoReceiveStream2::DecodeAndMaybeDispatchEncodedFrame
VCMGenericDecoder::Decode (真正的decode）-- 这里的decoder_ 就是 VideoDecoderSoftwareFallbackWrapper
VideoDecoderSoftwareFallbackWrapper::Decode
硬解： RTCVideoDecoderAdapter::Decode
软解： H264DecoderImpl::Decode (FFmpeg解码）
（video_codec_factory.cc 中会create hardware_decoder和software_decoder，并通过webrtc::CreateVideoDecoderSoftwareFallbackWrapper传入到webrtc fallback模块）
VideoReceiveStream2::OnCompleteFrame(std::unique_ptr<EncodedFrame> frame)
VideoStreamBufferController::InsertFrame
硬件解码失败：
NotifyError就会进入error状态，一旦进入error状态，直接一直返回std::move(decode_cb).Run(DecoderStatus::Codes::kInterrupted);
media/gpu/windows/d3d11_video_decoder.cc
log关键字：
deocde失败：Failed to decode frame
Decoded frame is not a CVPixelBuffer
解密失败:Failed to unprotect
Error code：
avcodec_send_packet error: -1094995529 FFERRTAG( 'I','N','D','A') ///< Invalid data found when processing input
avcodec_receive_packet -35: AVERROR(EAGAIN) output is not available in the current state - user must try to send input