Enable passing receive stream ID to the decoder factory.

webrtc/video_decoder.h

 /*
  *  Copyright (c) 2014 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 63 matching lines @@
       DecodedImageCallback* callback) = 0;
 
   virtual int32_t Release() = 0;
 
   // Returns true if the decoder prefer to decode frames late.
   // That is, it can not decode infinite number of frames before the decoded
   // frame is consumed.
   virtual bool PrefersLateDecoding() const { return true; }
 
   virtual const char* ImplementationName() const { return "unknown"; }
+
+  // Some VideoDecoders may choose to override this to return SSRC of the
+  // stream. Otherwise, returns 0.
+  virtual uint32_t ssrc() const { return 0; }

[perkj_webrtc, 2016/06/10 13:22:20]

please remove from the interface.

[sakal, 2016/06/14 13:28:44]

Done.

[noahric, 2016/06/14 17:51:10]

See my comment elsewhere; if receive streams can have multiple ssrcs, then you
need to keep this so the allocate-or-reuse can make sure to keep the ssrcs
consistent.

(Or if the ssrc can change through an allocate-or-reuse point)

 };
 
 // Class used to wrap external VideoDecoders to provide a fallback option on
 // software decoding when a hardware decoder fails to decode a stream due to
 // hardware restrictions, such as max resolution.
 class VideoDecoderSoftwareFallbackWrapper : public webrtc::VideoDecoder {
  public:
   VideoDecoderSoftwareFallbackWrapper(VideoCodecType codec_type,
                                       VideoDecoder* decoder);
 
@@ skipping 46 matching lines @@
       DecodedImageCallback* callback) override;
 
   int32_t Release() override;
 
   const char* ImplementationName() const override;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_VIDEO_DECODER_H_