int audio_get_formats()
{
int fmt = 0;
int r = rate;
int c = channels;
int i;
static int fmts[] = {
AUDIO_FORMAT_ULAW_8 , AUDIO_FORMAT_SIGNED_16 ,
AUDIO_FORMAT_UNSIGNED_8 , AUDIO_FORMAT_SIGNED_8 ,
AUDIO_FORMAT_UNSIGNED_16 , AUDIO_FORMAT_ALAW_8 };
for(i=0;i<6;i++) {
format = fmts[i];
if(audio_set_format() < 0) {
continue;
}
channels = c;
if(audio_set_channels() < 0) {
continue;
}
rate = r;
if(audio_rate_best_match() < 0) {
continue;
}
if( (rate*100 > r*(100-AUDIO_RATE_TOLERANCE)) && (rate*100 < r*(100+AUDIO_RATE_TOLERANCE)) ) {
fmt |= fmts[i];
}
}
return fmt;
}
int audio_reset_parameters(struct audio_info_struct *ai)
{
audio_set_format(ai);
audio_set_channels(ai);
audio_set_rate(ai);
return 0;
}
/* !!! pamiêtaæ o zainicjowaniu parametrów !!! */
int outputInit()
{
int ret;
filedevice = open( SOUNDDEVICE, O_WRONLY );
if ( filedevice == -1 )
return -1;
ret = ioctl( filedevice, SNDCTL_DSP_RESET, NULL );
if(ret < 0)
{
fprintf(stderr,"Can't reset audio!\n");
return -1;
}
if ( audio_set_format() < 0 )
return -1;
if ( audio_set_rate() < 0 )
return -1;
if ( audio_set_channels() < 0 )
return -1;
return 0;
}
int audio_open(struct audio_info_struct *ai)
{
int dev = AL_DEFAULT_OUTPUT;
ALconfig config = alNewConfig();
ALport port = NULL;
/* Test for correct completion */
if (config == 0) {
fprintf(stderr,"audio_open : %s\n",alGetErrorString(oserror()));
return -1;
}
/* Set port parameters */
if(ai->channels == 2)
alSetChannels(config, AL_STEREO);
else
alSetChannels(config, AL_MONO);
alSetWidth(config, AL_SAMPLE_16);
alSetSampFmt(config,AL_SAMPFMT_TWOSCOMP);
alSetQueueSize(config, 131069);
/* Setup output device to specified module. If there is no module
specified in ai structure, use the default four output */
if ((ai->device) != NULL) {
char *dev_name;
dev_name=malloc((strlen(ai->device) + strlen(analog_output_res_name) + 1) *
sizeof(char));
strcpy(dev_name,ai->device);
strcat(dev_name,analog_output_res_name);
/* Find the asked device resource */
dev=alGetResourceByName(AL_SYSTEM,dev_name,AL_DEVICE_TYPE);
/* Free allocated space */
free(dev_name);
if (!dev) {
fprintf(stderr,"Invalid audio resource: %s (%s)\n",dev_name,
alGetErrorString(oserror()));
return -1;
}
}
/* Set the device */
if (alSetDevice(config,dev) < 0)
{
fprintf(stderr,"audio_open : %s\n",alGetErrorString(oserror()));
return -1;
}
/* Open the audio port */
port = alOpenPort("mpg123-VSC", "w", config);
if(port == NULL) {
fprintf(stderr, "Unable to open audio channel: %s\n",
alGetErrorString(oserror()));
return -1;
}
ai->handle = (void*)port;
audio_set_format(ai, config);
audio_set_channels(ai, config);
audio_set_rate(ai, config);
alFreeConfig(config);
return 1;
}
