mirror of
https://github.com/danog/libtgvoip.git
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5caaaafa42
I'm now using the entire audio processing module from WebRTC as opposed to individual DSP algorithms pulled from there before. Seems to work better this way.
68 lines
2.4 KiB
C++
68 lines
2.4 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 COMMON_AUDIO_WAV_HEADER_H_
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#define 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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class ReadableWav {
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public:
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// Returns the number of bytes read.
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virtual size_t Read(void* buf, size_t num_bytes) = 0;
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// Returns true if the end-of-file has been reached.
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virtual bool Eof() const = 0;
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virtual bool SeekForward(uint32_t num_bytes) = 0;
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virtual ~ReadableWav() = default;
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};
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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(size_t num_channels,
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int sample_rate,
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WavFormat format,
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size_t bytes_per_sample,
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size_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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size_t num_channels,
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int sample_rate,
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WavFormat format,
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size_t bytes_per_sample,
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size_t num_samples);
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// Read a WAV header from an implemented ReadableWav and parse the values into
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// the provided output parameters. ReadableWav is used because the header can
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// be variably sized. Returns false if the header is invalid.
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bool ReadWavHeader(ReadableWav* readable,
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size_t* num_channels,
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int* sample_rate,
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WavFormat* format,
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size_t* bytes_per_sample,
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size_t* num_samples);
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} // namespace webrtc
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#endif // COMMON_AUDIO_WAV_HEADER_H_
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