Only parse PPS up to PPS and SPS ids in the depacketizater.

webrtc/common_video/h264/pps_parser.h

 /*
  *  Copyright (c) 2016 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 22 matching lines @@
     uint32_t weighted_bipred_idc = false;
     uint32_t redundant_pic_cnt_present_flag = 0;
     int pic_init_qp_minus26 = 0;
     uint32_t id = 0;
     uint32_t sps_id = 0;
   };
 
   // Unpack RBSP and parse PPS state from the supplied buffer.
   static rtc::Optional<PpsState> ParsePps(const uint8_t* data, size_t length);
 
+  static bool ParsePpsIds(const uint8_t* data,
+                          size_t length,
+                          uint32_t* pps_id,
+                          uint32_t* sps_id);
+
   static rtc::Optional<uint32_t> ParsePpsIdFromSlice(const uint8_t* data,
                                                      size_t length);
 
  protected:
   // Parse the PPS state, for a bit buffer where RBSP decoding has already been
   // performed.
   static rtc::Optional<PpsState> ParseInternal(rtc::BitBuffer* bit_buffer);
+  static bool ParsePpsIdsInternal(rtc::BitBuffer* bit_buffer,
+                                  uint32_t* pps_id,
+                                  uint32_t* sps_id);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_COMMON_VIDEO_H264_PPS_PARSER_H_