H264Decoder: Handle gaps in frame_num.

media/filters/h264_parser.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // This file contains an implementation of an H264 Annex-B video stream parser.
 
 #ifndef MEDIA_FILTERS_H264_PARSER_H_
 #define MEDIA_FILTERS_H264_PARSER_H_
 
 #include <sys/types.h>
@@ skipping 368 matching lines @@
   // To get a pointer to a given SPS/PPS structure, use GetSPS()/GetPPS(),
   // passing the returned |*sps_id|/|*pps_id| as parameter.
   // TODO(posciak,fischman): consider replacing returning Result from Parse*()
   // methods with a scoped_ptr and adding an AtEOS() function to check for EOS
   // if Parse*() return NULL.
   Result ParseSPS(int* sps_id);
   Result ParsePPS(int* pps_id);
 
   // Return a pointer to SPS/PPS with given |sps_id|/|pps_id| or NULL if not
   // present.
-  const H264SPS* GetSPS(int sps_id);
-  const H264PPS* GetPPS(int pps_id);
+  const H264SPS* GetSPS(int sps_id) const;
+  const H264PPS* GetPPS(int pps_id) const;
 
   // Slice headers and SEI messages are not used across NALUs by the parser
   // and can be discarded after current NALU, so the parser does not store
   // them, nor does it manage their memory.
   // The caller has to provide and manage it instead.
 
   // Parse a slice header, returning it in |*shdr|. |*nalu| must be set to
   // the NALU returned from AdvanceToNextNALU() and corresponding to |*shdr|.
   Result ParseSliceHeader(const H264NALU& nalu, H264SliceHeader* shdr);
 
@@ skipping 63 matching lines @@
   // Ranges of encrypted bytes in the buffer passed to
   // SetEncryptedStream().
   Ranges<const uint8*> encrypted_ranges_;
 
   DISALLOW_COPY_AND_ASSIGN(H264Parser);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_H264_PARSER_H_