Return parsed sample frequency of ADTS header

media/formats/mpeg/adts_header_parser.h

 // Copyright 2016 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.
 
 #ifndef MEDIA_FORMATS_MPEG_ADTS_HEADER_PARSER_H_
 #define MEDIA_FORMATS_MPEG_ADTS_HEADER_PARSER_H_
 
+#include <stddef.h>
 #include <stdint.h>
 
 #include "media/base/media_export.h"
 
 namespace media {
 
 class AudioDecoderConfig;
 
 // Parses ADTS header |adts_header| (4 bytes) and extracts the information into
 // |config| structure if the parsing succeeds. Returns true if the parsing
 // succeeds or false otherwise. The |is_sbr| flag stands for Spectral Band
-// Replication.
+// Replication. |orig_sample_rate| will return the sample frequency before
+// doubling in SBR.
 MEDIA_EXPORT bool ParseAdtsHeader(const uint8_t* adts_header,
                                   bool is_sbr,
-                                  AudioDecoderConfig* config);
+                                  AudioDecoderConfig* config,
+                                  size_t* orig_sample_rate);
 
 }  // namespace media
 
 #endif  // MEDIA_FORMATS_MPEG_ADTS_HEADER_PARSER_H_