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 16 namespace webrtc { 17 18 static const int kWavHeaderSize = 44; 19 20 enum 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. 27 bool 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. 37 void 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
