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; }