?? audio_sgi.c
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#include <sys/types.h>#include <stdio.h>#include <unistd.h>#include <fcntl.h>#include <stdlib.h>#include "audio.h"int audio_open(struct audio_info_struct *ai){ ai->config = ALnewconfig(); if(ai->channels == 2) ALsetchannels(ai->config, AL_STEREO); else ALsetchannels(ai->config, AL_MONO); ALsetwidth(ai->config, AL_SAMPLE_16); ALsetqueuesize(ai->config, 131069); ai->port = ALopenport("mpg132", "w", ai->config); if(ai->port == NULL){ fprintf(stderr, "Unable to open audio channel."); exit(-1); } audio_reset_parameters(ai); return 1;}int audio_reset_parameters(struct audio_info_struct *ai){ int ret; ret = audio_set_format(ai); if(ret >= 0) ret = audio_set_channels(ai); if(ret >= 0) ret = audio_set_rate(ai);/* todo: Set new parameters here */ return ret;}int audio_rate_best_match(struct audio_info_struct *ai){ return 0;}int audio_set_rate(struct audio_info_struct *ai){ long params[2] = {AL_OUTPUT_RATE, 44100}; params[1] = ai->rate; ALsetparams(AL_DEFAULT_DEVICE, params, 2); return 0;}int audio_set_channels(struct audio_info_struct *ai){ if(ai->channels == 2) ALsetchannels(ai->config, AL_STEREO); else ALsetchannels(ai->config, AL_MONO); return 0;}int audio_set_format(struct audio_info_struct *ai){ return 0;}int audio_get_formats(struct audio_info_struct *ai){ return AUDIO_FORMAT_SIGNED_16;}int audio_play_samples(struct audio_info_struct *ai,unsigned char *buf,int len){ if(ai->format == AUDIO_FORMAT_SIGNED_8) ALwritesamps(ai->port, buf, len); else ALwritesamps(ai->port, buf, len>>1); return len;}int audio_close(struct audio_info_struct *ai){ while(ALgetfilled(ai->port) > 0) sginap(1); ALcloseport(ai->port); ALfreeconfig(ai->config); return 0;}?? 快捷鍵說明
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