1/*
2 *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11#ifndef WEBRTC_COMMON_AUDIO_WAV_HEADER_H_
12#define WEBRTC_COMMON_AUDIO_WAV_HEADER_H_
13
14#include <stdint.h>
15
16namespace webrtc {
17
18static const int kWavHeaderSize = 44;
19
20enum WavFormat {
21  kWavFormatPcm   = 1,  // PCM, each sample of size bytes_per_sample
22  kWavFormatALaw  = 6,  // 8-bit ITU-T G.711 A-law
23  kWavFormatMuLaw = 7,  // 8-bit ITU-T G.711 mu-law
24};
25
26// Return true if the given parameters will make a well-formed WAV header.
27bool CheckWavParameters(int num_channels,
28                        int sample_rate,
29                        WavFormat format,
30                        int bytes_per_sample,
31                        uint32_t num_samples);
32
33// Write a kWavHeaderSize bytes long WAV header to buf. The payload that
34// follows the header is supposed to have the specified number of interleaved
35// channels and contain the specified total number of samples of the specified
36// type.
37void WriteWavHeader(uint8_t* buf,
38                    int num_channels,
39                    int sample_rate,
40                    WavFormat format,
41                    int bytes_per_sample,
42                    uint32_t num_samples);
43
44}  // namespace webrtc
45
46#endif  // WEBRTC_COMMON_AUDIO_WAV_HEADER_H_
47