2012-04-20 19:37:08 -05:00
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/*
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2012-05-21 23:27:44 -05:00
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FileHandler - General-purpose file handling library for Niotso
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read_wav.c - Copyright (c) 2012 Niotso Project <http://niotso.org/>
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Author(s): Fatbag <X-Fi6@phppoll.org>
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2012-04-20 19:37:08 -05:00
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <stdint.h>
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#include <string.h>
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#include "read_wav.h"
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#define WAVE_FORMAT_PCM 1
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#ifndef read_uint32
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#define read_uint32(x) (unsigned)(((x)[0]<<(8*0)) | ((x)[1]<<(8*1)) | ((x)[2]<<(8*2)) | ((x)[3]<<(8*3)))
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#define read_uint16(x) (unsigned)(((x)[0]<<(8*0)) | ((x)[1]<<(8*1)))
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#endif
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int wav_read_header(wavheader_t * WAVHeader, const uint8_t * Buffer, size_t FileSize){
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if(FileSize < 45) return 0;
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WAVHeader->sID = read_uint32(Buffer);
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WAVHeader->Size = read_uint32(Buffer+4);
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WAVHeader->DataType = read_uint32(Buffer+8);
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WAVHeader->FmtID = read_uint32(Buffer+12);
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WAVHeader->FmtSize = read_uint32(Buffer+16);
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WAVHeader->wFormatTag = read_uint16(Buffer+20);
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WAVHeader->nChannels = read_uint16(Buffer+22);
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WAVHeader->nSamplesPerSec = read_uint32(Buffer+24);
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WAVHeader->nAvgBytesPerSec = read_uint32(Buffer+28);
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WAVHeader->nBlockAlign = read_uint16(Buffer+32);
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WAVHeader->wBitsPerSample = read_uint16(Buffer+34);
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WAVHeader->DataID = read_uint32(Buffer+36);
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WAVHeader->DataSize = read_uint32(Buffer+40);
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2012-05-21 23:27:44 -05:00
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2012-04-20 19:37:08 -05:00
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if(WAVHeader->sID != 0x46464952 || WAVHeader->Size != FileSize-8 || WAVHeader->DataType != 0x45564157 ||
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WAVHeader->FmtID != 0x20746D66 || WAVHeader->FmtSize != 16 || WAVHeader->wFormatTag != WAVE_FORMAT_PCM ||
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WAVHeader->nChannels < 1 || WAVHeader->nChannels > 2 || WAVHeader->nSamplesPerSec == 0 ||
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(WAVHeader->nSamplesPerSec%8000 != 0 && WAVHeader->nSamplesPerSec%11025 != 0) || WAVHeader->nSamplesPerSec > 48000 ||
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WAVHeader->nAvgBytesPerSec != WAVHeader->nSamplesPerSec * WAVHeader->nBlockAlign ||
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WAVHeader->nBlockAlign != WAVHeader->nChannels * WAVHeader->wBitsPerSample >> 3 ||
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(WAVHeader->wBitsPerSample != 8 && WAVHeader->wBitsPerSample != 16) || WAVHeader->DataID != 0x61746164 ||
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WAVHeader->DataSize != FileSize - 44 || WAVHeader->DataSize % WAVHeader->nBlockAlign != 0
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) return 0;
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2012-05-21 23:27:44 -05:00
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2012-04-20 19:37:08 -05:00
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return 1;
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}
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