--- /dev/null
+/* wav.c
+ Routines for handling .wav files
+
+ Part of the swftools package.
+
+ Copyright (c) 2001 Matthias Kramm <kramm@quiss.org>
+
+ 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 */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include "wav.h"
+
+struct WAVBlock {
+ char id[4];
+ unsigned int size;
+};
+
+int getWAVBlock(FILE*fi, struct WAVBlock*block)
+{
+ unsigned int size;
+ unsigned char b[4];
+ if(fread(block->id,1,4,fi)<4)
+ return 0;
+ if(fread(b,1,4,fi)<4)
+ return 0;
+ block->size = b[0]|b[1]<<8|b[2]<<16|b[3]<<24;
+ /*printf("Chunk: [%c%c%c%c] (%d bytes)\n",
+ block->id[0],block->id[1],
+ block->id[2],block->id[3],
+ block->size);*/
+ return 1;
+}
+
+int readWAV(char* filename, struct WAV*wav)
+{
+ FILE*fi = fopen(filename, "rb");
+ unsigned char b[16];
+ long int filesize;
+ struct WAVBlock block;
+ long int pos;
+ if(!fi)
+ return 0;
+ fseek(fi, 0, SEEK_END);
+ filesize = ftell(fi);
+ fseek(fi, 0, SEEK_SET);
+
+ //printf("Filesize: %d\n", filesize);
+
+ if(!getWAVBlock (fi, &block))
+ return 0;
+ if(strncmp(block.id,"RIFF",4)) {
+ fprintf(stderr, "readWAV: not a WAV file\n");
+ return 0;
+ }
+ if(block.size + 8 < filesize)
+ fprintf(stderr, "readWAV: warning - more tags (%d extra bytes)\n",
+ filesize - block.size - 8);
+ if(block.size + 8 > filesize)
+ fprintf(stderr, "readWAV: warning - short file (%d bytes missing)\n",
+ block.size + 8 - filesize);
+ if(fread(b, 1, 4, fi) < 4) {
+ return 0;
+ }
+ if(strncmp(b, "WAVE", 4)) {
+ fprintf(stderr, "readWAV: not a WAV file (2)\n");
+ return 0;
+ }
+
+ do
+ {
+ getWAVBlock(fi, &block);
+ pos = ftell(fi);
+ if(!strncmp(block.id, "fmt ", 4)) {
+ if(fread(&b, 1, 16, fi)<16)
+ return 0;
+ wav->tag = b[0]|b[1]<<8;
+ wav->channels = b[2]|b[3]<<8;
+ wav->sampsPerSec = b[4]|b[5]<<8|b[6]<<16|b[7]<<24;
+ wav->bytesPerSec = b[8]|b[9]<<8|b[10]<<16|b[11]<<24;
+ wav->align = b[12]|b[13]<<8;
+ wav->bps = b[14]|b[15]<<8;
+ } else if (!strncmp(block.id, "LIST", 4)) {
+ // subchunk ICMT (comment) may exist
+ } else if (!strncmp(block.id, "data", 4)) {
+ wav->data = malloc(block.size);
+ if(!wav->data) {
+ fprintf(stderr, "Out of memory (%d bytes needed)", block.size);
+ return 0;
+ }
+ if(fread(wav->data, 1, block.size, fi) < block.size)
+ return 0;
+ wav->size = block.size;
+ }
+ pos+=block.size;
+ fseek(fi, pos, SEEK_SET);
+ }
+ while (pos < filesize);
+
+ return 1;
+}
+
+int writeWAV(char*filename, struct WAV*wav)
+{
+ FILE*fi = fopen(filename, "wb");
+ char*b="RIFFWAVEfmt \x10\0\0\0data";
+ char c[16];
+ unsigned long int w32;
+ if(!fi)
+ return 0;
+ fwrite(b, 4, 1, fi);
+ w32=(/*fmt*/8+0x10+/*data*/8+wav->size);
+ c[0] = w32;
+ c[1] = w32>>8;
+ c[2] = w32>>16;
+ c[3] = w32>>24;
+ fwrite(c, 4, 1, fi);
+ fwrite(&b[4], 12, 1, fi);
+ c[0] = wav->tag;
+ c[1] = wav->tag>>8;
+ c[2] = wav->channels;
+ c[3] = wav->channels>>8;
+ c[4] = wav->sampsPerSec;
+ c[5] = wav->sampsPerSec>>8;
+ c[6] = wav->sampsPerSec>>16;
+ c[7] = wav->sampsPerSec>>24;
+ c[8] = wav->bytesPerSec;
+ c[9] = wav->bytesPerSec>>8;
+ c[10] = wav->bytesPerSec>>16;
+ c[11] = wav->bytesPerSec>>24;
+ c[12] = wav->align;
+ c[13] = wav->align>>8;
+ c[14] = wav->bps;
+ c[15] = wav->bps>>8;
+ fwrite(c, 16, 1, fi);
+ fwrite(&b[16], 4, 1, fi);
+ c[0] = wav->size;
+ c[1] = wav->size>>8;
+ c[2] = wav->size>>16;
+ c[3] = wav->size>>24;
+ fwrite(c,4,1,fi);
+ printf("writing %d converted bytes\n", wav->size);
+ fwrite(wav->data,wav->size,1,fi);
+ fclose(fi);
+ return 1;
+}
+
+void printWAVInfo(struct WAV*wav)
+{
+ printf("tag:%04x channels:%d samples/sec:%d bytes/sec:%d align:%d bits/sample:%d size:%d\n",
+ wav->tag, wav->channels, wav->sampsPerSec, wav->bytesPerSec,
+ wav->align, wav->bps, wav->size);
+}
+
+int convertWAV2mono(struct WAV*src, struct WAV*dest, int rate)
+{
+ int samplelen=src->size/src->align;
+ int bps=src->bps;
+ double ratio;
+ double pos = 0;
+ int pos2 = 0;
+ int channels=src->channels;
+ int i;
+ int fill;
+
+ dest->sampsPerSec = rate;
+ dest->bps = 16;
+ dest->channels = 1;
+ dest->align = 2;
+ dest->tag = src->tag;
+ dest->bytesPerSec = dest->sampsPerSec*dest->align;
+
+ ratio = (double)dest->sampsPerSec/(double)src->sampsPerSec;
+ fill = (int)(ratio+1)*2;
+
+ dest->data = (unsigned char*)malloc((int)(samplelen*ratio*2)+128);
+ if(!dest->data)
+ return 0;
+ dest->size = (int)(samplelen*ratio)*2;
+
+ if(bps == 8) {
+ if(ratio <= 1) {
+ for(i=0; i<src->size; i+=channels) {
+ int pos2 = ((int)pos)*2;
+ dest->data[pos2] = 0;
+ dest->data[pos2+1] = src->data[i]+128;
+ pos += ratio;
+ }
+ } else {
+ for(i=0; i<src->size; i+=channels) {
+ int j;
+ int pos2 = ((int)pos)*2;
+ for(j=0;j<fill;j+=2) {
+ dest->data[pos2+j+0] = 0;
+ dest->data[pos2+j+1] = src->data[i]+128;
+ }
+ pos += ratio;
+ }
+ }
+ } else if(bps == 16) {
+ if(ratio <= 1) {
+ for(i=0; i<src->size/2; i+=channels) {
+ int pos2 = ((int)pos)*2;
+ dest->data[pos2+0]=src->data[i*2];
+ dest->data[pos2+1]=src->data[i*2+1];
+ pos += ratio;
+ }
+ } else {
+ for(i=0; i<src->size/2; i+=channels) {
+ int j;
+ int pos2 = ((int)pos)*2;
+ for(j=0;j<fill;j+=2) {
+ dest->data[pos2+j+0] = src->data[i*2];
+ dest->data[pos2+j+1] = src->data[i*2+1];
+ }
+ pos += ratio;
+ }
+ }
+ } else if(bps == 32) {
+ if(ratio <= 1) {
+ for(i=0; i<src->size/4; i+=channels) {
+ int pos2 = ((int)pos)*2;
+ dest->data[pos2+0]=src->data[i*4+2];
+ dest->data[pos2+1]=src->data[i*4+3];
+ pos += ratio;
+ }
+ } else {
+ for(i=0; i<src->size/4; i+=channels) {
+ int j;
+ int pos2 = ((int)pos)*2;
+ for(j=0;j<fill;j+=2) {
+ dest->data[pos2+j+0] = src->data[i*4+2];
+ dest->data[pos2+j+1] = src->data[i*4+3];
+ }
+ pos += ratio;
+ }
+ }
+ }
+ return 1;
+}
+
+
git.asbjorn.biz / swftools.git / commitdiff