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/*
MyWAV 0.1.1
by Luigi Auriemma
e-mail: aluigi@autistici.org
web: aluigi.org
Copyright 2005,2006 Luigi Auriemma
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
http://www.gnu.org/licenses/gpl.txt
*/
#include <string.h>
//#include <stdint.h>
typedef unsigned char uint8_t;
typedef unsigned int uint32_t;
typedef signed short int16_t;
typedef unsigned short uint16_t;
#include <stdio.h>
/*
the functions return ever 0 if success, other values (-1) if error
note that these functions have been written with compatibility in mind
so don't worry if you see useless instructions
*/
typedef struct {
uint8_t id[4];
uint32_t size;
} mywav_chunk;
typedef struct {
int16_t wFormatTag;
uint16_t wChannels;
uint32_t dwSamplesPerSec;
uint32_t dwAvgBytesPerSec;
uint16_t wBlockAlign;
uint16_t wBitsPerSample;
} mywav_fmtchunk;
/* FILE WRITING */
// 8 bit
int mywav_fwi08(FILE *fd, int num) {
if(fputc((num ) & 0xff, fd) < 0) return(-1);
return(0);
}
// 16 bit
int mywav_fwi16(FILE *fd, int num) {
if(fputc((num ) & 0xff, fd) < 0) return(-1);
if(fputc((num >> 8) & 0xff, fd) < 0) return(-1);
return(0);
}
// 32 bit
int mywav_fwi32(FILE *fd, int num) {
if(fputc((num ) & 0xff, fd) < 0) return(-1);
if(fputc((num >> 8) & 0xff, fd) < 0) return(-1);
if(fputc((num >> 16) & 0xff, fd) < 0) return(-1);
if(fputc((num >> 24) & 0xff, fd) < 0) return(-1);
return(0);
}
// data
int mywav_fwmem(FILE *fd, uint8_t *mem, int size) {
if(size) {
if(fwrite(mem, size, 1, fd) != 1) return(-1);
}
return(0);
}
// chunk
int mywav_fwchunk(FILE *fd, mywav_chunk *chunk) {
if(mywav_fwmem(fd, chunk->id, 4)) return(-1);
if(mywav_fwi32(fd, chunk->size)) return(-1);
return(0);
}
// fmtchunk
int mywav_fwfmtchunk(FILE *fd, mywav_fmtchunk *fmtchunk) {
if(mywav_fwi16(fd, fmtchunk->wFormatTag)) return(-1);
if(mywav_fwi16(fd, fmtchunk->wChannels)) return(-1);
if(mywav_fwi32(fd, fmtchunk->dwSamplesPerSec)) return(-1);
if(mywav_fwi32(fd, fmtchunk->dwAvgBytesPerSec)) return(-1);
if(mywav_fwi16(fd, fmtchunk->wBlockAlign)) return(-1);
if(mywav_fwi16(fd, fmtchunk->wBitsPerSample)) return(-1);
return(0);
}
/* FILE READING */
// 8 bit
int mywav_fri08(FILE *fd, uint8_t *num) {
if(fread(num, 1, 1, fd) != 1) return(-1);
return(0);
}
// 16 bit
int mywav_fri16(FILE *fd, uint16_t *num) {
uint16_t ret;
uint8_t tmp;
if(fread(&tmp, 1, 1, fd) != 1) return(-1); ret = tmp;
if(fread(&tmp, 1, 1, fd) != 1) return(-1); ret |= (tmp << 8);
*num = ret;
return(0);
}
// 32 bit
int mywav_fri32(FILE *fd, uint32_t *num) {
uint32_t ret;
uint8_t tmp;
if(fread(&tmp, 1, 1, fd) != 1) return(-1); ret = tmp;
if(fread(&tmp, 1, 1, fd) != 1) return(-1); ret |= (tmp << 8);
if(fread(&tmp, 1, 1, fd) != 1) return(-1); ret |= (tmp << 16);
if(fread(&tmp, 1, 1, fd) != 1) return(-1); ret |= (tmp << 24);
*num = ret;
return(0);
}
// data
int mywav_frmem(FILE *fd, uint8_t *mem, int size) {
if(size) {
if(fread(mem, size, 1, fd) != 1) return(-1);
}
return(0);
}
// chunk
int mywav_frchunk(FILE *fd, mywav_chunk *chunk) {
if(mywav_frmem(fd, (uint8_t *)&chunk->id, 4)) return(-1);
if(mywav_fri32(fd, (uint32_t *)&chunk->size)) return(-1);
return(0);
}
// fmtchunk
int mywav_frfmtchunk(FILE *fd, mywav_fmtchunk *fmtchunk) {
if(mywav_fri16(fd, (uint16_t *)&fmtchunk->wFormatTag)) return(-1);
if(mywav_fri16(fd, (uint16_t *)&fmtchunk->wChannels)) return(-1);
if(mywav_fri32(fd, (uint32_t *)&fmtchunk->dwSamplesPerSec)) return(-1);
if(mywav_fri32(fd, (uint32_t *)&fmtchunk->dwAvgBytesPerSec)) return(-1);
if(mywav_fri16(fd, (uint16_t *)&fmtchunk->wBlockAlign)) return(-1);
if(mywav_fri16(fd, (uint16_t *)&fmtchunk->wBitsPerSample)) return(-1);
return(0);
}
/* MYWAV MAIN FUNCTIONS */
int mywav_seekchunk(FILE *fd, uint8_t *find) {
mywav_chunk chunk;
if(fseek(fd, sizeof(mywav_chunk) + 4, SEEK_SET) < 0) return(-1);
while(!mywav_frchunk(fd, &chunk)) {
if(!memcmp(chunk.id, find, 4)) return(chunk.size);
if(fseek(fd, chunk.size, SEEK_CUR) < 0) break;
}
return(-1);
}
int mywav_data(FILE *fd, mywav_fmtchunk *fmt) {
mywav_chunk chunk;
uint8_t type[4];
if(mywav_frchunk(fd, &chunk) < 0) return(-1);
if(mywav_frmem(fd, type, 4) < 0) return(-1);
if(memcmp(type, "WAVE", 4)) return(-1);
if(mywav_seekchunk(fd, (uint8_t*)"fmt ") < 0) return(-1);
if(mywav_frfmtchunk(fd, fmt) < 0) return(-1);
return(mywav_seekchunk(fd, (uint8_t*)"data"));
}
int mywav_writehead(FILE *fd, mywav_fmtchunk *fmt, uint32_t data_size, uint8_t *more, int morelen) {
mywav_chunk chunk;
memcpy(chunk.id, "RIFF", 4);
chunk.size =
4 +
sizeof(mywav_chunk) +
sizeof(mywav_fmtchunk) +
morelen +
sizeof(mywav_chunk) +
data_size;
if(mywav_fwchunk(fd, &chunk) < 0) return(-1);
if(mywav_fwmem(fd, (uint8_t*)"WAVE", 4) < 0) return(-1);
memcpy(chunk.id, "fmt ", 4);
chunk.size = sizeof(mywav_fmtchunk) + morelen;
if(mywav_fwchunk(fd, &chunk) < 0) return(-1);
if(mywav_fwfmtchunk(fd, fmt) < 0) return(-1);
if(mywav_fwmem(fd, more, morelen) < 0) return(-1);
memcpy(chunk.id, "data", 4);
chunk.size = data_size;
if(mywav_fwchunk(fd, &chunk) < 0) return(-1);
return(0);
}
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