f866b2d9f9
Karl pointed out that the user can check the validity of the input parameters with CheckWavParameters prior to calling. TBR=kwiberg Review URL: https://webrtc-codereview.appspot.com/23339004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@7597 4adac7df-926f-26a2-2b94-8c16560cd09d
57 lines
2.0 KiB
C++
57 lines
2.0 KiB
C++
/*
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* Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_COMMON_AUDIO_WAV_HEADER_H_
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#define WEBRTC_COMMON_AUDIO_WAV_HEADER_H_
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#include <stddef.h>
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#include <stdint.h>
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namespace webrtc {
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static const size_t kWavHeaderSize = 44;
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enum WavFormat {
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kWavFormatPcm = 1, // PCM, each sample of size bytes_per_sample
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kWavFormatALaw = 6, // 8-bit ITU-T G.711 A-law
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kWavFormatMuLaw = 7, // 8-bit ITU-T G.711 mu-law
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};
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// Return true if the given parameters will make a well-formed WAV header.
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bool CheckWavParameters(int num_channels,
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int sample_rate,
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WavFormat format,
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int bytes_per_sample,
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uint32_t num_samples);
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// Write a kWavHeaderSize bytes long WAV header to buf. The payload that
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// follows the header is supposed to have the specified number of interleaved
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// channels and contain the specified total number of samples of the specified
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// type. CHECKs the input parameters for validity.
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void WriteWavHeader(uint8_t* buf,
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int num_channels,
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int sample_rate,
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WavFormat format,
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int bytes_per_sample,
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uint32_t num_samples);
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// Read a kWavHeaderSize bytes long WAV header from buf and parse the values
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// into the provided output parameters. Returns false if the header is invalid.
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bool ReadWavHeader(const uint8_t* buf,
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int* num_channels,
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int* sample_rate,
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WavFormat* format,
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int* bytes_per_sample,
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uint32_t* num_samples);
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} // namespace webrtc
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#endif // WEBRTC_COMMON_AUDIO_WAV_HEADER_H_
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