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/*
* madplay - MPEG audio decoder and player
* Copyright (C) 2000-2004 Robert Leslie
*
* 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
*
* $Id: audio_snd.c,v 1.15 2004/01/23 09:41:31 rob Exp $
*/
# ifdef HAVE_CONFIG_H
# include "config.h"
# endif
# include "global.h"
# include <stdio.h>
# include <string.h>
# include <mad.h>
# include "audio.h"
# define AUDIO_FILE_MAGIC (('.' << 24) | ('s' << 16) | ('n' << 8) | 'd')
# define AUDIO_UNKNOWN_SIZE (~0) /* (unsigned) -1 */
# define AUDIO_ENCODING_MULAW_8 1 /* 8-bit ISDN mu-law */
static FILE *outfile;
static unsigned long data_len;
static unsigned int config_channels;
static unsigned int config_speed;
static unsigned int config_precision;
/*
* NAME: int32()
* DESCRIPTION: store 32-bit big-endian integer
*/
static
void int32(unsigned char *ptr, unsigned long num)
{
ptr[0] = num >> 24;
ptr[1] = num >> 16;
ptr[2] = num >> 8;
ptr[3] = num >> 0;
}
static
int init(struct audio_init *init)
{
if (init->path && strcmp(init->path, "-") != 0) {
outfile = fopen(init->path, "wb");
if (outfile == 0) {
audio_error = ":";
return -1;
}
}
else
outfile = stdout;
data_len = 0;
config_channels = 0;
config_speed = 0;
config_precision = 0;
return 0;
}
static
int config(struct audio_config *config)
{
unsigned char header[24];
if (config_precision) {
/* it's not possible to change the format once set */
config->channels = config_channels;
config->speed = config_speed;
config->precision = config_precision;
return 0;
}
/* Sun/NeXT audio file header */
int32(&header[0], AUDIO_FILE_MAGIC); /* magic */
int32(&header[4], sizeof(header)); /* hdr_size */
int32(&header[8], AUDIO_UNKNOWN_SIZE); /* data_size */
int32(&header[12], AUDIO_ENCODING_MULAW_8); /* encoding */
int32(&header[16], config->speed); /* sample_rate */
int32(&header[20], config->channels); /* channels */
if (fwrite(header, sizeof(header), 1, outfile) != 1) {
audio_error = ":fwrite";
return -1;
}
data_len = 0;
/* require 8-bit depth for now */
config->precision = 8;
config_channels = config->channels;
config_speed = config->speed;
config_precision = config->precision;
return 0;
}
static
int play(struct audio_play *play)
{
unsigned char data[MAX_NSAMPLES * 2];
unsigned int len;
len = audio_pcm_mulaw(data, play->nsamples,
play->samples[0], play->samples[1],
play->mode, play->stats);
if (fwrite(data, play->samples[1] ? 2 : 1,
play->nsamples, outfile) != play->nsamples) {
audio_error = ":fwrite";
return -1;
}
data_len += len;
return 0;
}
static
int stop(struct audio_stop *stop)
{
return 0;
}
static
int patch_int32(long address, unsigned long num)
{
unsigned char dword[4];
if (fseek(outfile, address, SEEK_SET) == -1) {
audio_error = ":fseek";
return -1;
}
int32(dword, num);
if (fwrite(dword, sizeof(dword), 1, outfile) != 1) {
audio_error = ":fwrite";
return -1;
}
if (fseek(outfile, 0, SEEK_END) == -1) {
audio_error = ":fseek";
return -1;
}
return 0;
}
static
int finish(struct audio_finish *finish)
{
int result = 0;
if (config_precision == 0) {
struct audio_config dummy;
/* write empty chunks */
dummy.command = AUDIO_COMMAND_CONFIG;
dummy.channels = 2;
dummy.speed = 44100;
dummy.precision = 0;
result = config(&dummy);
}
if (result == 0)
patch_int32(8, data_len);
if (outfile != stdout &&
fclose(outfile) == EOF &&
result == 0) {
audio_error = ":fclose";
result = -1;
}
return result;
}
int audio_snd(union audio_control *control)
{
audio_error = 0;
switch (control->command) {
case AUDIO_COMMAND_INIT:
return init(&control->init);
case AUDIO_COMMAND_CONFIG:
return config(&control->config);
case AUDIO_COMMAND_PLAY:
return play(&control->play);
case AUDIO_COMMAND_STOP:
return stop(&control->stop);
case AUDIO_COMMAND_FINISH:
return finish(&control->finish);
}
return 0;
}
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