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/*
* audio.c
*
* Moo like a cow
*
* (c) 2008 Thomas White <taw27@srcf.ucam.org>
*
* This file is part of OpenMooCow - accelerometer moobox simulator
*
* OpenMooCow 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 3 of the License, or
* (at your option) any later version.
*
* OpenMooCow 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 OpenMooCow. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* SDL's headers don't like this. Grr. */
//#ifdef HAVE_CONFIG_H
//#include <config.h>
//#endif
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <SDL.h>
#include <SDL_audio.h>
#include <math.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/wait.h>
#include <assert.h>
#include "types.h"
static AudioContext *audio_context = NULL;
static void audio_mix(void *data, Uint8 *stream8, int len) {
AudioContext *a = data;
int j;
Sint16 *stream = (Sint16 *)stream8;
Sint16 samp;
len /= 2; /* Number of samples to write */
for ( j=0; j<len; j++ ) {
stream[j] = 0;
if ( a->moo_pos < a->moo_len ) {
samp = a->moo_buf[a->moo_pos++];
stream[j] += samp;
} else {
a->mootex = 0;
}
}
}
void audio_trigger_moo() {
AudioContext *a = audio_context;
if ( a == NULL ) {
/* Try to open the audio again */
printf("Trying to open the audio again...\n");
audio_setup();
a = audio_context;
if ( a == NULL ) return;
}
if ( a->mootex != 0 ) return;
printf("Moo!\n");
a->mootex = 1;
if ( a->moo_pos == a->moo_len ) {
a->moo_pos = 0;
}
}
/* SDL audio initial setup */
void audio_setup() {
AudioContext *a;
SDL_AudioSpec fmt;
SDL_AudioSpec wave;
Uint8 *data;
Uint32 dlen;
SDL_AudioCVT cvt;
/* Create audio context */
a = malloc(sizeof(AudioContext));
assert(a != NULL);
a->mootex = 0;
/* 16-bit mono audio at 44.1 kHz */
fmt.freq = 44100;
fmt.format = AUDIO_S16;
fmt.channels = 1;
fmt.samples = 512;
fmt.callback = audio_mix;
fmt.userdata = a;
fmt.silence = 0;
if ( SDL_OpenAudio(&fmt, NULL) < 0 ) {
fprintf(stderr, "Unable to open audio: %s\n", SDL_GetError());
free(a);
return;
}
if ( SDL_LoadWAV(DATADIR"/openmoocow/moo.wav", &wave, &data, &dlen) == NULL ) {
fprintf(stderr, "Couldn't load moo sound: %s\n", SDL_GetError());
free(a);
return;
}
SDL_BuildAudioCVT(&cvt, wave.format, wave.channels, wave.freq, AUDIO_S16, 1, 44100);
cvt.buf = malloc(dlen*cvt.len_mult);
if ( cvt.buf == NULL ) {
fprintf(stderr, "Not enough memory to convert audio \n");
free(a);
return;
}
memcpy(cvt.buf, data, dlen);
cvt.len = dlen;
SDL_ConvertAudio(&cvt);
SDL_FreeWAV(data);
a->moo_len = cvt.len_cvt/2 - 2; /* Convert bytes to samples */
a->moo_pos = a->moo_len; /* Play nothing to start with */
a->moo_buf = (Sint16 *)cvt.buf;
audio_context = a;
SDL_PauseAudio(0);
}
void audio_shutdown(AudioContext *a) {
if ( a == NULL ) return;
SDL_CloseAudio();
/* Now this can be freed */
free(a);
}
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