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/*
* tplay - buffered audio player
*
* (c) 1997 ilkka karvinen <ik@iki.fi>
*
* Copyright under the GNU GENERAL PUBLIC LICENSE
* (see the file COPYING in this directory)
*
*
* RIFF/WAVE file header checking.
* check_wav returns zero if RIFF/WAVE file format is found.
* Reference: http://www.wotsit.demon.co.uk/formats/wav/wav.txt
*/
#include "tplayfunctions.h"
#include <iostream>
using namespace std;
int read_wav(struct info_struct* info, char * buffer) {
WORD format, channels, bits;
DWORD magic, samples_per_second, length, data_length;
magic = read_little_endian_long(buffer);
if (magic != RIFF_MAGIC) /* RIFF file? */
return (1);
magic = read_little_endian_long(buffer + 0x08);
if (magic != WAVE_MAGIC) /* WAVE file? */
return (1);
magic = read_little_endian_long(buffer + 0x24);
if ((magic != DATA_MAGIC) && (magic != INFO_MAGIC)) { /* data-portion there? */
cout << "Unknown WAV-header magic. Continuing anyway."<<endl;
}
length = read_little_endian_long(buffer + 0x10);
/* Subchunk length should be 16 here */
if (length != 16)
errdie("Unknown RIFF/WAVE header");
format = read_little_endian_word(buffer + 0x14);
switch (format) {
case 0x0001: /* PCM format */
break;
case 0x0101: /* mu-law */
die("Mu-law RIFF/WAVE audio file not supported");
break;
case 0x0102: /* a-law */
die("A-law RIFF/WAVE audio file not supported");
break;
case 0x0103: /* ADPCM */
die("ADPCM RIFF/WAVE audio file not supported");
break;
default:
errdie("Unknown RIFF/WAVE audio file format");
break;
}
info->filetype = RIFF_FILE;
channels = read_little_endian_word(buffer + 0x16);
samples_per_second = read_little_endian_long(buffer + 0x18);
cout << "samples_per_second:"<<samples_per_second<<endl;
bits = read_little_endian_word(buffer + 0x22);
if (bits == 12)
die("12 bits per sample not supported");
data_length = read_little_endian_long(buffer + 0x28);
/* Set audio parameters */
info->speed = (int) samples_per_second;
info->bits = (int) bits;
info->channels = (int) channels;
if (info->verbose)
printf("RIFF/WAVE audio file: %ld samples/s, %d bits, %d channel(s).\n",
info->speed, info->bits, info->channels);
/* Move data to start from the beginning of the buffer. */
/* This is to ensure the correct behaviour of rounding when 16bits */
/* and/or stereo sample is to be played. */
memmove(buffer, buffer + 0x2c, info->blocksize - 0x2c);
/* Save audio sample starting point */
info->headerskip = 0x2c;
return (0);
}
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