Use sps and pps to determine decodability of H.264 frames.

webrtc/modules/video_coding/session_info.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 93 matching lines @@
     return kNoTl0PicIdx;
   }
 }
 
 bool VCMSessionInfo::NonReference() const {
   if (packets_.empty() || packets_.front().video_header.codec != kRtpVideoVp8)
     return false;
   return packets_.front().video_header.codecHeader.VP8.nonReference;
 }
 
+std::vector<NaluInfo> VCMSessionInfo::GetNaluInfos() const {
+  if (packets_.empty() || packets_.front().video_header.codec != kRtpVideoH264)
+    return std::vector<NaluInfo>();
+  std::vector<NaluInfo> nalu_infos;
+  for (const VCMPacket& packet : packets_) {
+    for (size_t i = 0; i < packet.video_header.codecHeader.H264.nalus_length;
+         ++i) {
+      nalu_infos.push_back(packet.video_header.codecHeader.H264.nalus[i]);
+    }
+  }
+  return nalu_infos;
+}
+
 void VCMSessionInfo::SetGofInfo(const GofInfoVP9& gof_info, size_t idx) {
   if (packets_.empty() || packets_.front().video_header.codec != kRtpVideoVp9 ||
       packets_.front().video_header.codecHeader.VP9.flexible_mode) {
     return;
   }
   packets_.front().video_header.codecHeader.VP9.temporal_idx =
       gof_info.temporal_idx[idx];
   packets_.front().video_header.codecHeader.VP9.temporal_up_switch =
       gof_info.temporal_up_switch[idx];
   packets_.front().video_header.codecHeader.VP9.num_ref_pics =
@@ skipping 428 matching lines @@
   if (empty_seq_num_high_ == -1)
     empty_seq_num_high_ = seq_num;
   else
     empty_seq_num_high_ = LatestSequenceNumber(seq_num, empty_seq_num_high_);
   if (empty_seq_num_low_ == -1 ||
       IsNewerSequenceNumber(empty_seq_num_low_, seq_num))
     empty_seq_num_low_ = seq_num;
 }
 
 }  // namespace webrtc