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      1 /*
      2  * libjingle
      3  * Copyright 2014 Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #ifndef TALK_MEDIA_WEBRTC_SIMULCAST_H_
     29 #define TALK_MEDIA_WEBRTC_SIMULCAST_H_
     30 
     31 #include <vector>
     32 
     33 #include "webrtc/base/basictypes.h"
     34 #include "webrtc/config.h"
     35 
     36 namespace cricket {
     37 struct StreamParams;
     38 
     39 // Config for use with screen cast when temporal layers are enabled.
     40 struct ScreenshareLayerConfig {
     41  public:
     42   ScreenshareLayerConfig(int tl0_bitrate, int tl1_bitrate);
     43 
     44   // Bitrates, for temporal layers 0 and 1.
     45   int tl0_bitrate_kbps;
     46   int tl1_bitrate_kbps;
     47 
     48   static ScreenshareLayerConfig GetDefault();
     49 
     50   // Parse bitrate from group name on format "(tl0_bitrate)-(tl1_bitrate)",
     51   // eg. "100-1000" for the default rates.
     52   static bool FromFieldTrialGroup(const std::string& group,
     53                                   ScreenshareLayerConfig* config);
     54 };
     55 
     56 // TODO(pthatcher): Write unit tests just for these functions,
     57 // independent of WebrtcVideoEngine.
     58 
     59 int GetTotalMaxBitrateBps(const std::vector<webrtc::VideoStream>& streams);
     60 
     61 // Get the ssrcs of the SIM group from the stream params.
     62 void GetSimulcastSsrcs(const StreamParams& sp, std::vector<uint32_t>* ssrcs);
     63 
     64 // Get simulcast settings.
     65 std::vector<webrtc::VideoStream> GetSimulcastConfig(size_t max_streams,
     66                                                     int width,
     67                                                     int height,
     68                                                     int max_bitrate_bps,
     69                                                     int max_qp,
     70                                                     int max_framerate);
     71 
     72 }  // namespace cricket
     73 
     74 #endif  // TALK_MEDIA_WEBRTC_SIMULCAST_H_
     75