audio_sun.c

用JAVA写的MP3,MP2,MP1解码源代码

#include <sys/types.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>

#ifdef SOLARIS
#include <stropts.h>
#include <sys/conf.h>
#endif

#include <stdlib.h>

#include "audio.h"

#ifdef NETBSD
#include <sys/ioctl.h>
#endif

#include <sys/filio.h>
#ifdef SUNOS
#include <sun/audioio.h>
#else
#include <sys/audioio.h>
#endif

static void audio_set_format_helper(struct audio_info_struct *ai,audio_info_t *ainfo);


int audio_open(struct audio_info_struct *ai)
{
#ifndef NETBSD
  audio_info_t ainfo;
#endif

  if(!ai->device) {
    if(getenv("AUDIODEV")) {
      if(param.verbose > 1) 
         fprintf(stderr,"Using audio-device value from AUDIODEV environment variable!\n");
      ai->device = getenv("AUDIODEV");
    }
    else 
      ai->device = "/dev/audio";
  }

  ai->fn = open(ai->device,O_WRONLY);
  if(ai->fn < 0)
     return ai->fn;

#ifdef SUNOS
  {
    int type;
    if(ioctl(ai->fn, AUDIO_GETDEV, &type) == -1)
      return -1;
    if(type == AUDIO_DEV_UNKNOWN || type == AUDIO_DEV_AMD)
      return -1;
  }
#else
#ifdef SOLARIS
  {
    struct audio_device ad;
    if(ioctl(ai->fn, AUDIO_GETDEV, &ad) == -1)
      return -1;
    if(param.verbose > 1)
      fprintf(stderr,"Audio device type: %s\n",ad.name);
    if(!strstr(ad.name,"dbri") && !strstr(ad.name,"CS4231") && param.verbose)
      fprintf(stderr,"Warning: Unknown sound system %s. But we try it.\n",ad.name);
  }
#endif
#endif

  if(audio_reset_parameters(ai) < 0) {
    return -1;
  }

#ifndef NETBSD
  AUDIO_INITINFO(&ainfo);

  switch(ai->output) {
    case AUDIO_OUT_INTERNAL_SPEAKER:
      ainfo.play.port = AUDIO_SPEAKER;
      break;
    case AUDIO_OUT_HEADPHONES:
      ainfo.play.port = AUDIO_HEADPHONE;
      break;
    case AUDIO_OUT_LINE_OUT:
      ainfo.play.port = AUDIO_LINE_OUT;
      break;
  }

  if(ai->gain != -1)
    ainfo.play.gain = ai->gain;

  if(ioctl(ai->fn, AUDIO_SETINFO, &ainfo) == -1)
    return -1;
#endif

  return ai->fn;
}

int audio_reset_parameters(struct audio_info_struct *ai)
{
  int ret;
  audio_info_t ainfo;

  AUDIO_INITINFO(&ainfo);

  if(ai->rate != -1)
    ainfo.play.sample_rate = ai->rate;
  if(ai->channels >= 0)
    ainfo.play.channels = ai->channels;
  audio_set_format_helper(ai,&ainfo);

  if(ioctl(ai->fn, AUDIO_SETINFO, &ainfo) == -1)
    return -1;
  return 0;
}

int audio_rate_best_match(struct audio_info_struct *ai)
{
  audio_info_t ainfo;
  AUDIO_INITINFO(&ainfo);
 
  ainfo.play.sample_rate = ai->rate;
  if(ioctl(ai->fn, AUDIO_SETINFO, &ainfo) < 0) {
    ai->rate = 0;
    return 0;
  }
  if(ioctl(ai->fn, AUDIO_GETINFO, &ainfo) < 0) {
    return -1;
  }
  ai->rate = ainfo.play.sample_rate;
  return 0;
}

int audio_set_rate(struct audio_info_struct *ai)
{
  audio_info_t ainfo;

  if(ai->rate != -1) {
    AUDIO_INITINFO(&ainfo);
    ainfo.play.sample_rate = ai->rate;
    if(ioctl(ai->fn, AUDIO_SETINFO, &ainfo) == -1)
      return -1;
    return 0;
  }
  return -1;
}

int audio_set_channels(struct audio_info_struct *ai)
{
  audio_info_t ainfo;

  AUDIO_INITINFO(&ainfo);
  ainfo.play.channels = ai->channels;
  if(ioctl(ai->fn, AUDIO_SETINFO, &ainfo) == -1)
    return -1;
  return 0;
}

static void audio_set_format_helper(struct audio_info_struct *ai,audio_info_t *ainfo)
{


  switch(ai->format) {
    case -1:
    case AUDIO_FORMAT_SIGNED_16:
    default:
      ainfo->play.encoding = AUDIO_ENCODING_LINEAR;
      ainfo->play.precision = 16;
      break;
    case AUDIO_FORMAT_UNSIGNED_8:
#ifdef SOLARIS
      ainfo->play.encoding = AUDIO_ENCODING_LINEAR8;
      ainfo->play.precision = 8;
      break;
#endif
#ifdef NETBSD
      ainfo->play.encoding = AUDIO_ENCODING_LINEAR;
      ainfo->play.precision = 8;
      break;
#endif
    case AUDIO_FORMAT_SIGNED_8:
      fprintf(stderr,"Linear signed 8 bit not supported!\n");
      return;
    case AUDIO_FORMAT_ULAW_8:
      ainfo->play.encoding = AUDIO_ENCODING_ULAW;
      ainfo->play.precision = 8;
      break;
    case AUDIO_FORMAT_ALAW_8:
      ainfo->play.encoding = AUDIO_ENCODING_ALAW;
      ainfo->play.precision = 8;
      break;
  }
}

int audio_set_format(struct audio_info_struct *ai)
{
  audio_info_t ainfo;

  AUDIO_INITINFO(&ainfo);
  audio_set_format_helper(ai,&ainfo);
  if(ioctl(ai->fn, AUDIO_SETINFO, &ainfo) == -1)
    return -1;

  return 0;
}

int audio_get_formats(struct audio_info_struct *ai)
{
  static int tab[][3] = {
    { AUDIO_ENCODING_ULAW , 8,  AUDIO_FORMAT_ULAW_8 } ,
    { AUDIO_ENCODING_ALAW , 8,  AUDIO_FORMAT_ALAW_8 } ,
    { AUDIO_ENCODING_LINEAR , 16,  AUDIO_FORMAT_SIGNED_16 } ,
#ifdef SOLARIS
    { AUDIO_ENCODING_LINEAR8 , 8,  AUDIO_FORMAT_UNSIGNED_8 } ,
#endif
#ifdef NETBSD
    { AUDIO_ENCODING_LINEAR , 8,  AUDIO_FORMAT_UNSIGNED_8 } 
#endif
  };

  audio_info_t ainfo;
  int i,fmts=0;

  for(i=0;i<4;i++) {
    AUDIO_INITINFO(&ainfo);
    ainfo.play.encoding = tab[i][0];
    ainfo.play.precision = tab[i][1];
#if 1
    ainfo.play.sample_rate = ai->rate;
    ainfo.play.channels = ai->channels;
#endif
    if(ioctl(ai->fn, AUDIO_SETINFO, &ainfo) >= 0) {
      fmts |= tab[i][2];
    }
  }
  return fmts;
}

int audio_play_samples(struct audio_info_struct *ai,unsigned char *buf,int len)
{
  return write(ai->fn,buf,len);
}

int audio_close(struct audio_info_struct *ai)
{
  close (ai->fn);
  return 0;
}

#ifdef SOLARIS
void audio_queueflush (struct audio_info_struct *ai)
{
	ioctl (ai->fn, I_FLUSH, FLUSHRW);
}
#endif

#ifdef NETBSD
void audio_queueflush (struct audio_info_struct *ai)
{
	ioctl (ai->fn, AUDIO_FLUSH, 0);
}
#endif