C++ AUDIO_INITINFO函数代码示例

static int pa_solaris_auto_format(int fd, int mode, pa_sample_spec *ss) {
    audio_info_t info;

    AUDIO_INITINFO(&info);

    if (mode != O_RDONLY) {
        info.play.sample_rate = ss->rate;
        info.play.channels = ss->channels;
        switch (ss->format) {
        case PA_SAMPLE_U8:
            info.play.precision = 8;
            info.play.encoding = AUDIO_ENCODING_LINEAR;
            break;
        case PA_SAMPLE_ALAW:
            info.play.precision = 8;
            info.play.encoding = AUDIO_ENCODING_ALAW;
            break;
        case PA_SAMPLE_ULAW:
            info.play.precision = 8;
            info.play.encoding = AUDIO_ENCODING_ULAW;
            break;
        case PA_SAMPLE_S16NE:
            info.play.precision = 16;
            info.play.encoding = AUDIO_ENCODING_LINEAR;
            break;
        default:
            return -1;
        }
    }

    if (mode != O_WRONLY) {
        info.record.sample_rate = ss->rate;
        info.record.channels = ss->channels;
        switch (ss->format) {
        case PA_SAMPLE_U8:
            info.record.precision = 8;
            info.record.encoding = AUDIO_ENCODING_LINEAR;
            break;
        case PA_SAMPLE_ALAW:
            info.record.precision = 8;
            info.record.encoding = AUDIO_ENCODING_ALAW;
            break;
        case PA_SAMPLE_ULAW:
            info.record.precision = 8;
            info.record.encoding = AUDIO_ENCODING_ULAW;
            break;
        case PA_SAMPLE_S16NE:
            info.record.precision = 16;
            info.record.encoding = AUDIO_ENCODING_LINEAR;
            break;
        default:
            return -1;
        }
    }

    if (ioctl(fd, AUDIO_SETINFO, &info) < 0) {
        if (errno == EINVAL)
            pa_log("AUDIO_SETINFO: Unsupported sample format.");
        else
            pa_log("AUDIO_SETINFO: %s", pa_cstrerror(errno));
        return -1;
    }

    return 0;
}

/*********************************************************************
 * Try to open the named device.
 * If it opens, try to set various rates and formats and fill in
 * the device info structure.
 */
PaError Pa_QueryDevice( const char *deviceName, internalPortAudioDevice *pad )
{
    int result = paHostError;
    int tempDevHandle;
    int numChannels, maxNumChannels;
    int numSampleRates;
    int sampleRate;
    int numRatesToTry;
    int ratesToTry[9] = {96000, 48000, 44100, 32000, 24000, 22050, 16000, 11025, 8000};
    int i;
    audio_info_t solaris_info;
    audio_device_t device_info;

    /* douglas:
     we have to do this querying in a slightly different order. apparently
     some sound cards will give you different info based on their settins.
     e.g. a card might give you stereo at 22kHz but only mono at 44kHz.
     the correct order for OSS is: format, channels, sample rate

    */
	/*
	 to check a device for it's capabilities, it's probably better to use the
	 equivalent "-ctl"-descriptor - MR
	*/
    char devname[strlen(deviceName) + 4];
    snprintf(devname,(strlen(deviceName) + 4),"%sctl",deviceName);

    if ((tempDevHandle = open(devname, O_WRONLY|O_NONBLOCK))  == -1 )
    {
        DBUG(("Pa_QueryDevice: could not open %s\n", deviceName ));
        return paHostError;
    }

    /*  Ask OSS what formats are supported by the hardware. */
    pad->pad_Info.nativeSampleFormats = 0;
    AUDIO_INITINFO(&solaris_info);

    /* SAM 12/31/01: Sparc native does mulaw, alaw and PCM.
       I think PCM is signed. */

    for (i = 8; i <= 32; i += 8) {
      solaris_info.play.precision = i;
      solaris_info.play.encoding = AUDIO_ENCODING_LINEAR;
      /* If there are no errors, add the format. */
      if (ioctl(tempDevHandle, AUDIO_SETINFO, &solaris_info) > -1) {
	switch (i) {
	case 8:
	  pad->pad_Info.nativeSampleFormats |= paInt8;
	  break;
	case 16:
	  pad->pad_Info.nativeSampleFormats |= paInt16;
	  break;
	case 24:
	  pad->pad_Info.nativeSampleFormats |= paInt24;
	  break;
	case 32:
	  pad->pad_Info.nativeSampleFormats |= paInt32;
	  break;
	}
      }
    }

    maxNumChannels = 0;
    for( numChannels = 1; numChannels <= 16; numChannels++ )
      {
	int temp = numChannels;
	DBUG(("Pa_QueryDevice: use SNDCTL_DSP_CHANNELS, numChannels = %d\n", numChannels ))
	  AUDIO_INITINFO(&solaris_info);
	solaris_info.play.channels = temp;
	if (ioctl(tempDevHandle, AUDIO_SETINFO, &solaris_info) < 0)
	  {
	    /* ioctl() failed so bail out if we already have stereo */
	    if( numChannels > 2 ) break;
	  }
	else
	  {
	    /* ioctl() worked but bail out if it does not support numChannels.
	     * We don't want to leave gaps in the numChannels supported.
	     */
	    if( (numChannels > 2) && (temp != numChannels) ) break;
	    DBUG(("Pa_QueryDevice: temp = %d\n", temp ))
	      if( temp > maxNumChannels ) maxNumChannels = temp; /* Save maximum. */
	  }
      }

    pad->pad_Info.maxOutputChannels = maxNumChannels;
    DBUG(("Pa_QueryDevice: maxNumChannels = %d\n", maxNumChannels))

    /* FIXME - for now, assume maxInputChannels = maxOutputChannels.
     *    Eventually do separate queries for O_WRONLY and O_RDONLY
    */
    pad->pad_Info.maxInputChannels = pad->pad_Info.maxOutputChannels;

    DBUG(("Pa_QueryDevice: maxInputChannels = %d\n",
          pad->pad_Info.maxInputChannels))
//.........这里部分代码省略.........

static void input_sound(unsigned int sample_rate, unsigned int overlap,
                        const char *ifname)
{
    audio_info_t audioinfo;
    audio_info_t audioinfo2;
    audio_device_t audiodev;
    int fd;
    short buffer[8192];
    float fbuf[16384];
    unsigned int fbuf_cnt = 0;
    int i;
    short *sp;
    
    if ((fd = open(ifname ? ifname : "/dev/audio", O_RDONLY)) < 0) {
        perror("open");
        exit (10);
    }
    if (ioctl(fd, AUDIO_GETDEV, &audiodev) == -1) {
        perror("ioctl: AUDIO_GETDEV");
        exit (10);
    }
    AUDIO_INITINFO(&audioinfo);
    audioinfo.record.sample_rate = sample_rate;
    audioinfo.record.channels = 1;
    audioinfo.record.precision = 16;
    audioinfo.record.encoding = AUDIO_ENCODING_LINEAR;
    /*audioinfo.record.gain = 0x20;
      audioinfo.record.port = AUDIO_LINE_IN;
      audioinfo.monitor_gain = 0;*/
    if (ioctl(fd, AUDIO_SETINFO, &audioinfo) == -1) {
        perror("ioctl: AUDIO_SETINFO");
        exit (10);
    }
    if (ioctl(fd, I_FLUSH, FLUSHR) == -1) {
        perror("ioctl: I_FLUSH");
        exit (10);
    }
    if (ioctl(fd, AUDIO_GETINFO, &audioinfo2) == -1) {
        perror("ioctl: AUDIO_GETINFO");
        exit (10);
    }
    fprintf(stdout, "Audio device: name %s, ver %s, config %s, "
            "sampling rate %d\n", audiodev.name, audiodev.version,
            audiodev.config, audioinfo.record.sample_rate);
    for (;;) {
        i = read(fd, sp = buffer, sizeof(buffer));
        if (i < 0 && errno != EAGAIN) {
            perror("read");
            exit(4);
        }
        if (!i)
            break;
        if (i > 0) {
            if(integer_only)
        {
                fbuf_cnt = i/sizeof(buffer[0]);
        }
            else
            {
                for (; i >= sizeof(buffer[0]); i -= sizeof(buffer[0]), sp++)
                    fbuf[fbuf_cnt++] = (*sp) * (1.0/32768.0);
                if (i)
                    fprintf(stderr, "warning: noninteger number of samples read\n");
            }
            if (fbuf_cnt > overlap) {
                process_buffer(fbuf, buffer, fbuf_cnt-overlap);
                memmove(fbuf, fbuf+fbuf_cnt-overlap, overlap*sizeof(fbuf[0]));
                fbuf_cnt = overlap;
            }
        }
    }
    close(fd);
}

static int
SUNAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
{
    const int flags = ((iscapture) ? OPEN_FLAGS_INPUT : OPEN_FLAGS_OUTPUT);
    SDL_AudioFormat format = 0;
    audio_info_t info;

    /* We don't care what the devname is...we'll try to open anything. */
    /*  ...but default to first name in the list... */
    if (devname == NULL) {
        devname = SDL_GetAudioDeviceName(0, iscapture);
        if (devname == NULL) {
            return SDL_SetError("No such audio device");
        }
    }

    /* Initialize all variables that we clean on shutdown */
    this->hidden = (struct SDL_PrivateAudioData *)
        SDL_malloc((sizeof *this->hidden));
    if (this->hidden == NULL) {
        return SDL_OutOfMemory();
    }
    SDL_memset(this->hidden, 0, (sizeof *this->hidden));

    /* Open the audio device */
    this->hidden->audio_fd = open(devname, flags, 0);
    if (this->hidden->audio_fd < 0) {
        return SDL_SetError("Couldn't open %s: %s", devname, strerror(errno));
    }

#ifdef AUDIO_SETINFO
    int enc;
#endif
    int desired_freq = this->spec.freq;

    /* Determine the audio parameters from the AudioSpec */
    switch (SDL_AUDIO_BITSIZE(this->spec.format)) {

    case 8:
        {                       /* Unsigned 8 bit audio data */
            this->spec.format = AUDIO_U8;
#ifdef AUDIO_SETINFO
            enc = AUDIO_ENCODING_LINEAR8;
#endif
        }
        break;

    case 16:
        {                       /* Signed 16 bit audio data */
            this->spec.format = AUDIO_S16SYS;
#ifdef AUDIO_SETINFO
            enc = AUDIO_ENCODING_LINEAR;
#endif
        }
        break;

    default:
        {
            /* !!! FIXME: fallback to conversion on unsupported types! */
            return SDL_SetError("Unsupported audio format");
        }
    }
    this->hidden->audio_fmt = this->spec.format;

    this->hidden->ulaw_only = 0;    /* modern Suns do support linear audio */
#ifdef AUDIO_SETINFO
    for (;;) {
        audio_info_t info;
        AUDIO_INITINFO(&info);  /* init all fields to "no change" */

        /* Try to set the requested settings */
        info.play.sample_rate = this->spec.freq;
        info.play.channels = this->spec.channels;
        info.play.precision = (enc == AUDIO_ENCODING_ULAW)
            ? 8 : this->spec.format & 0xff;
        info.play.encoding = enc;
        if (ioctl(this->hidden->audio_fd, AUDIO_SETINFO, &info) == 0) {

            /* Check to be sure we got what we wanted */
            if (ioctl(this->hidden->audio_fd, AUDIO_GETINFO, &info) < 0) {
                return SDL_SetError("Error getting audio parameters: %s",
                                    strerror(errno));
            }
            if (info.play.encoding == enc
                && info.play.precision == (this->spec.format & 0xff)
                && info.play.channels == this->spec.channels) {
                /* Yow! All seems to be well! */
                this->spec.freq = info.play.sample_rate;
                break;
            }
        }

        switch (enc) {
        case AUDIO_ENCODING_LINEAR8:
            /* unsigned 8bit apparently not supported here */
            enc = AUDIO_ENCODING_LINEAR;
            this->spec.format = AUDIO_S16SYS;
            break;              /* try again */

        case AUDIO_ENCODING_LINEAR:
//.........这里部分代码省略.........

FILE *out_file_open(char *outFile, int rate, int *channels)
{
   FILE *fout=NULL;
   /*Open output file*/
   if (strlen(outFile)==0)
   {
#if defined HAVE_SYS_SOUNDCARD_H
      int audio_fd, format, stereo;
      audio_fd=open("/dev/dsp", O_WRONLY);
      if (audio_fd<0)
      {
         perror("Cannot open /dev/dsp");
         exit(1);         
      }

     format=AFMT_S16_NE;
//       format=AFMT_S16_LE;
      if (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &format)==-1)
      {
         perror("SNDCTL_DSP_SETFMT");
         close(audio_fd);
         exit(1);
      }

      stereo=0;
      if (*channels==2)
         stereo=1;
      if (ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo)==-1)
      {
         perror("SNDCTL_DSP_STEREO");
         close(audio_fd);
         exit(1);
      }
      if (stereo!=0)
      {
         if (*channels==1)
            fprintf (stderr, "Cannot set mono mode, will decode in stereo\n");
         *channels=2;
      }

      if (ioctl(audio_fd, SNDCTL_DSP_SPEED, &rate)==-1)
      {
         perror("SNDCTL_DSP_SPEED");
         close(audio_fd);
         exit(1);
      }
      fout = fdopen(audio_fd, "w");
	  
	  printf ("/dev/dsp opened");
	  
#elif defined HAVE_SYS_AUDIOIO_H
      audio_info_t info;
      int audio_fd;
      
      audio_fd = open("/dev/audio", O_WRONLY);
      if (audio_fd<0)
      {
         perror("Cannot open /dev/audio");
         exit(1);
      }

      AUDIO_INITINFO(&info);
#ifdef AUMODE_PLAY    /* NetBSD/OpenBSD */
      info.mode = AUMODE_PLAY;
#endif
      info.play.encoding = AUDIO_ENCODING_SLINEAR;
      info.play.precision = 16;
      info.play.sample_rate = rate;
      info.play.channels = *channels;
      
      if (ioctl(audio_fd, AUDIO_SETINFO, &info) < 0)
      {
         perror ("AUDIO_SETINFO");
         exit(1);
      }
      fout = fdopen(audio_fd, "w");
#elif defined WIN32 || defined _WIN32
      {
         unsigned int speex_channels = *channels;
         if (Set_WIN_Params (INVALID_FILEDESC, rate, SAMPLE_SIZE, speex_channels))
         {
            fprintf (stderr, "Can't access %s\n", "WAVE OUT");
            exit(1);
         }
      }
#else
      fprintf (stderr, "No soundcard support\n");
      exit(1);
#endif
   } 
   
   return fout;
}

static int
sio_sun_setpar(struct sio_hdl *sh, struct sio_par *par)
{
#define NRETRIES 8
	struct sio_sun_hdl *hdl = (struct sio_sun_hdl *)sh;
	struct audio_info aui;
	unsigned int i, infr, ibpf, onfr, obpf;
	unsigned int bufsz, round;
	unsigned int rate, req_rate, prec, enc;

	/*
	 * try to set parameters until the device accepts
	 * a common encoding and rate for play and record
	 */
	rate = par->rate;
	prec = par->bits;
	sio_sun_enctoinfo(hdl, &enc, par);
	for (i = 0;; i++) {
		if (i == NRETRIES) {
			DPRINTF("sio_sun_setpar: couldn't set parameters\n");
			hdl->sio.eof = 1;
			return 0;
		}
		AUDIO_INITINFO(&aui);
		if (hdl->sio.mode & SIO_PLAY) {
			aui.play.sample_rate = rate;
			aui.play.precision = prec;
			aui.play.encoding = enc;
			aui.play.channels = par->pchan;
		}
		if (hdl->sio.mode & SIO_REC) {
			aui.record.sample_rate = rate;
			aui.record.precision = prec;
			aui.record.encoding = enc;
			aui.record.channels = par->rchan;
		}
		DPRINTFN(2, "sio_sun_setpar: %i: trying pars = %u/%u/%u\n",
		    i, rate, prec, enc);
		if (ioctl(hdl->fd, AUDIO_SETINFO, &aui) < 0 && errno != EINVAL) {
			DPERROR("sio_sun_setpar: setinfo(pars)");
			hdl->sio.eof = 1;
			return 0;
		}
		if (ioctl(hdl->fd, AUDIO_GETINFO, &aui) < 0) {
			DPERROR("sio_sun_setpar: getinfo(pars)");
			hdl->sio.eof = 1;
			return 0;
		}
		enc = (hdl->sio.mode & SIO_REC) ?
		    aui.record.encoding : aui.play.encoding;
		switch (enc) {
		case AUDIO_ENCODING_SLINEAR_LE:
		case AUDIO_ENCODING_SLINEAR_BE:
		case AUDIO_ENCODING_ULINEAR_LE:
		case AUDIO_ENCODING_ULINEAR_BE:
		case AUDIO_ENCODING_SLINEAR:
		case AUDIO_ENCODING_ULINEAR:
			break;
		default:
			DPRINTF("sio_sun_setpar: couldn't set linear encoding\n");
			hdl->sio.eof = 1;
			return 0;
		}
		if (hdl->sio.mode != (SIO_REC | SIO_PLAY))
			break;
		if (aui.play.sample_rate == aui.record.sample_rate &&
		    aui.play.precision == aui.record.precision &&
		    aui.play.encoding == aui.record.encoding)
			break;
		if (i < NRETRIES / 2) {
			rate = aui.play.sample_rate;
			prec = aui.play.precision;
			enc = aui.play.encoding;
		} else {
			rate = aui.record.sample_rate;
			prec = aui.record.precision;
			enc = aui.record.encoding;
		}
	}

	/*
	 * If the rate that the hardware is using is different than
	 * the requested rate, scale buffer sizes so they will be the
	 * same time duration as what was requested.  This just gets
	 * the rates to use for scaling, that actual scaling is done
	 * later.
	 */
	rate = (hdl->sio.mode & SIO_REC) ? aui.record.sample_rate :
	    aui.play.sample_rate;
	req_rate = rate;
	if (par->rate && par->rate != ~0U)
		req_rate = par->rate;

	/*
	 * if block size and buffer size are not both set then
	 * set the blocksize to half the buffer size
	 */
	bufsz = par->appbufsz;
	round = par->round;
	if (bufsz != ~0U) {
//.........这里部分代码省略.........

//PORTING: This function contains a ton of OS specific stuff. Hack and
//         slash at will.
Error SoundCardPMO::Init(OutputInfo * info)
{
   m_properlyInitialized = false;

   if (!info)
   {
      info = myInfo;
   }
   else
   {
      // got info, so this is the beginning...
      if ((audio_fd = open("/dev/audio", O_WRONLY, 0)) < 0)
      {
         if (errno == EBUSY)
         {
            ReportError("Audio device is busy. Please make sure that "
                        "another program is not using the device.");
            return (Error) pmoError_DeviceOpenFailed;
         }
         else
         {
            ReportError("Cannot open audio device. Please make sure that "
                        "the audio device is properly configured.");
            return (Error) pmoError_DeviceOpenFailed;
         }
      }

      m_iDataSize = info->max_buffer_size;
   }

   int       fd = audio_fd;
   struct audio_info ainfo;

   if (ioctl(audio_fd, AUDIO_GETINFO, &ainfo) < 0)
   {
      ReportError("Cannot get the flags on the audio device.");
      return (Error) pmoError_IOCTL_F_GETFL;
   }

   audio_fd = fd;

   channels = info->number_of_channels;

   for (unsigned int i = 0; i < info->number_of_channels; ++i)
      bufferp[i] = buffer + i;

   // configure the device:
   int       play_precision = 16;
//   int       play_stereo = channels - 1;
   int       play_sample_rate = info->samples_per_second;

   if (ioctl(audio_fd, I_FLUSH, FLUSHRW) == -1)
   {
      ReportError("Cannot reset the soundcard.");
      return (Error) pmoError_IOCTL_SNDCTL_DSP_RESET;
   }
   
   AUDIO_INITINFO(&ainfo);
   ainfo.play.precision = play_precision;
   ainfo.play.channels = channels;
   ainfo.play.sample_rate = play_sample_rate;
   ainfo.play.encoding = AUDIO_ENCODING_LINEAR;

   if (ioctl(audio_fd, AUDIO_SETINFO, &ainfo) == -1)
   {
      ReportError("Cannot set the soundcard's sampling speed.");
      return (Error) pmoError_IOCTL_SNDCTL_DSP_SPEED;
   }
   myInfo->bits_per_sample = info->bits_per_sample;
   myInfo->number_of_channels = info->number_of_channels;
   myInfo->samples_per_second = info->samples_per_second;
   myInfo->max_buffer_size = info->max_buffer_size;
   m_properlyInitialized = true;

   // PORTING: The GETOSPACE ioctl determines how much space the kernel's
   // output buffer has. Your OS may not have this.

   m_iTotalFragments = 2048; /* An arbitrary value of 2048. */
   m_iOutputBufferSize = play_precision * m_iTotalFragments;
   m_iBytesPerSample = info->number_of_channels * (info->bits_per_sample / 8);

   return kError_NoErr;
}

//.........这里部分代码省略.........
	rplay_audio_table = dbri_table;		/* use the dbri table */
    }
    else
    {
	report(REPORT_ERROR, "`%s' unknown audio device detected\n", d.name);
	return -1;
    }

    /* Verify the precision and format. */
    switch (rplay_audio_precision)
    {
    case 8:
	if (rplay_audio_format != RPLAY_FORMAT_ULAW
	    && rplay_audio_format != RPLAY_FORMAT_LINEAR_8)
	{
	    report(REPORT_ERROR, "rplay_audio_init: can't use %d bits with format=%d\n",
		   rplay_audio_precision, rplay_audio_format);
	    return -1;
	}
	break;

    case 16:
	if (rplay_audio_format != RPLAY_FORMAT_LINEAR_16)
	{
	    report(REPORT_ERROR, "rplay_audio_init: can't use %d bits with format=%d\n",
		   rplay_audio_precision, rplay_audio_format);
	    return -1;
	}
	break;

    default:
	report(REPORT_ERROR, "rplay_audio_init: `%d' unsupported audio precision\n",
	       rplay_audio_precision);
	return -1;
    }

    AUDIO_INITINFO(&a);

    switch (rplay_audio_format)
    {
    case RPLAY_FORMAT_ULAW:
	a.play.encoding = AUDIO_ENCODING_ULAW;
	break;

    case RPLAY_FORMAT_LINEAR_8:
    case RPLAY_FORMAT_LINEAR_16:
	a.play.encoding = AUDIO_ENCODING_LINEAR;
	break;

    default:
	report(REPORT_ERROR, "rplay_audio_init: unsupported audio format `%d'\n",
	       rplay_audio_format);
	return -1;
    }

    /* Audio port. */
    if (rplay_audio_port == RPLAY_AUDIO_PORT_NONE)
    {
	a.play.port = ~0;	/* see AUDIO_INITINFO in /usr/include/sys/audioio.h. */
    }
    else
    {
	a.play.port = 0;
	if (BIT(rplay_audio_port, RPLAY_AUDIO_PORT_LINEOUT))
	{
#ifdef AUDIO_LINE_OUT
	    SET_BIT(a.play.port, AUDIO_LINE_OUT);
#else
	    CLR_BIT(rplay_audio_port, RPLAY_AUDIO_PORT_LINEOUT);
#endif
	}
	if (BIT(rplay_audio_port, RPLAY_AUDIO_PORT_HEADPHONE))
	{
#ifdef AUDIO_HEADPHONE
	    SET_BIT(a.play.port, AUDIO_HEADPHONE);
#else
	    CLR_BIT(rplay_audio_port, RPLAY_AUDIO_PORT_HEADPHONE);
#endif
	}
	if (BIT(rplay_audio_port, RPLAY_AUDIO_PORT_SPEAKER))
	{
#ifdef AUDIO_SPEAKER
	    SET_BIT(a.play.port, AUDIO_SPEAKER);
#endif
	    /* Assume speaker is okay. */
	}
    }

    a.play.sample_rate = rplay_audio_sample_rate;
    a.play.precision = rplay_audio_precision;
    a.play.channels = rplay_audio_channels;

    if (ioctl(rplay_audio_fd, AUDIO_SETINFO, &a) < 0)
    {
	report(REPORT_ERROR, "rplay_audio_init: AUDIO_SETINFO: %s\n", sys_err_str(errno));
	return -1;
    }

    return 0;
}

int
DSP_OpenAudio(_THIS, SDL_AudioSpec * spec)
{
    char audiodev[1024];
#ifdef AUDIO_SETINFO
    int enc;
#endif
    int desired_freq = spec->freq;

    /* Initialize our freeable variables, in case we fail */
    audio_fd = -1;
    mixbuf = NULL;
    ulaw_buf = NULL;

    /* Determine the audio parameters from the AudioSpec */
    switch (SDL_AUDIO_BITSIZE(spec->format)) {

    case 8:
        {                       /* Unsigned 8 bit audio data */
            spec->format = AUDIO_U8;
#ifdef AUDIO_SETINFO
            enc = AUDIO_ENCODING_LINEAR8;
#endif
        }
        break;

    case 16:
        {                       /* Signed 16 bit audio data */
            spec->format = AUDIO_S16SYS;
#ifdef AUDIO_SETINFO
            enc = AUDIO_ENCODING_LINEAR;
#endif
        }
        break;

    default:
        {
            /* !!! FIXME: fallback to conversion on unsupported types! */
            SDL_SetError("Unsupported audio format");
            return (-1);
        }
    }
    audio_fmt = spec->format;

    /* Open the audio device */
    audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 1);
    if (audio_fd < 0) {
        SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
        return (-1);
    }

    ulaw_only = 0;              /* modern Suns do support linear audio */
#ifdef AUDIO_SETINFO
    for (;;) {
        audio_info_t info;
        AUDIO_INITINFO(&info);  /* init all fields to "no change" */

        /* Try to set the requested settings */
        info.play.sample_rate = spec->freq;
        info.play.channels = spec->channels;
        info.play.precision = (enc == AUDIO_ENCODING_ULAW)
            ? 8 : spec->format & 0xff;
        info.play.encoding = enc;
        if (ioctl(audio_fd, AUDIO_SETINFO, &info) == 0) {

            /* Check to be sure we got what we wanted */
            if (ioctl(audio_fd, AUDIO_GETINFO, &info) < 0) {
                SDL_SetError("Error getting audio parameters: %s",
                             strerror(errno));
                return -1;
            }
            if (info.play.encoding == enc
                && info.play.precision == (spec->format & 0xff)
                && info.play.channels == spec->channels) {
                /* Yow! All seems to be well! */
                spec->freq = info.play.sample_rate;
                break;
            }
        }

        switch (enc) {
        case AUDIO_ENCODING_LINEAR8:
            /* unsigned 8bit apparently not supported here */
            enc = AUDIO_ENCODING_LINEAR;
            spec->format = AUDIO_S16SYS;
            break;              /* try again */

        case AUDIO_ENCODING_LINEAR:
            /* linear 16bit didn't work either, resort to µ-law */
            enc = AUDIO_ENCODING_ULAW;
            spec->channels = 1;
            spec->freq = 8000;
            spec->format = AUDIO_U8;
            ulaw_only = 1;
            break;

        default:
            /* oh well... */
            SDL_SetError("Error setting audio parameters: %s",
                         strerror(errno));
//.........这里部分代码省略.........

void
xf86OSRingBell(int loudness, int pitch, int duration)
{
    static short    samples[BELL_SAMPLES];
    static short    silence[BELL_SAMPLES]; /* "The Sound of Silence" */
    static int      lastFreq;
    int             cnt; 
    int             i;
    int             written;
    int             repeats;
    int             freq;
    audio_info_t    audioInfo;
    struct iovec    iov[IOV_MAX];
    int             iovcnt;
    double          ampl, cyclen, phase;
    int             audioFD;

    if ((loudness <= 0) || (pitch <= 0) || (duration <= 0)) {
        return;
    }

    lastFreq = 0;
    memset(silence, 0, sizeof(silence));

    audioFD = open(AUDIO_DEVICE, O_WRONLY | O_NONBLOCK);
    if (audioFD == -1) {
        xf86Msg(X_ERROR, "Bell: cannot open audio device \"%s\": %s\n",
                AUDIO_DEVICE, strerror(errno));
        return;
    }

    freq = pitch;
    freq = min(freq, (BELL_RATE / 2) - 1);
    freq = max(freq, 2 * BELL_HZ);

    /*
     * Ensure full waves per buffer
     */
    freq -= freq % BELL_HZ;

    if (freq != lastFreq) {
        lastFreq = freq;
        ampl =  16384.0;

        cyclen = (double) freq / (double) BELL_RATE;
        phase = 0.0;

        for (i = 0; i < BELL_SAMPLES; i++) {
            samples[i] = (short) (ampl * sin(2.0 * M_PI * phase));
            phase += cyclen;
            if (phase >= 1.0)
                phase -= 1.0;
        }
    }

    repeats = (duration + (BELL_MS / 2)) / BELL_MS;
    repeats = max(repeats, BELL_MIN);

    loudness = max(0, loudness);
    loudness = min(loudness, 100);

#ifdef DEBUG
    ErrorF("BELL : freq %d volume %d duration %d repeats %d\n",
           freq, loudness, duration, repeats);
#endif

    AUDIO_INITINFO(&audioInfo);
    audioInfo.play.encoding = AUDIO_ENCODING_LINEAR;
    audioInfo.play.sample_rate = BELL_RATE;
    audioInfo.play.channels = 2;
    audioInfo.play.precision = 16;
    audioInfo.play.gain = min(AUDIO_MAX_GAIN, AUDIO_MAX_GAIN * loudness / 100);

    if (ioctl(audioFD, AUDIO_SETINFO, &audioInfo) < 0){
        xf86Msg(X_ERROR,
                "Bell: AUDIO_SETINFO failed on audio device \"%s\": %s\n",
                AUDIO_DEVICE, strerror(errno));
        close(audioFD);
        return;
    }

    iovcnt = 0;

    for (cnt = 0; cnt <= repeats; cnt++) {
        if (cnt == repeats) {
            /* Insert a bit of silence so that multiple beeps are distinct and
             * not compressed into a single tone.
             */
            iov[iovcnt].iov_base = (char *) silence;
            iov[iovcnt++].iov_len = sizeof(silence);
        } else {
            iov[iovcnt].iov_base = (char *) samples;
            iov[iovcnt++].iov_len = sizeof(samples);
        }
        if ((iovcnt >= IOV_MAX) || (cnt == repeats)) {
            written = writev(audioFD, iov, iovcnt);

            if ((written < ((int)(sizeof(samples) * iovcnt)))) {
                /* audio buffer was full! */

//.........这里部分代码省略.........

static int init(struct options *options)
{
	char **parm = options->driver_parm;
	audio_info_t ainfo;
	int gain = 128;
	int bsize = 32 * 1024;

	parm_init(parm);
	chkparm1("gain", gain = strtoul(token, NULL, 0));
	chkparm1("buffer", bsize = strtoul(token, NULL, 0));
	parm_end();

	if ((audio_fd = open("/dev/sound", O_WRONLY)) == -1)
		return -1;

	/* try to open audioctldevice */
	if ((audioctl_fd = open("/dev/audioctl", O_RDWR)) < 0) {
		fprintf(stderr, "couldn't open audioctldevice\n");
		close(audio_fd);
		return -1;
	}

	/* empty buffers before change config */
	ioctl(audio_fd, AUDIO_DRAIN, 0);	/* drain everything out */
	ioctl(audio_fd, AUDIO_FLUSH);		/* flush audio */
	ioctl(audioctl_fd, AUDIO_FLUSH);	/* flush audioctl */

	/* get audio parameters. */
	if (ioctl(audioctl_fd, AUDIO_GETINFO, &ainfo) < 0) {
		fprintf(stderr, "AUDIO_GETINFO failed!\n");
		close(audio_fd);
		close(audioctl_fd);
		return -1;
	}

	close(audioctl_fd);

	if (gain < AUDIO_MIN_GAIN)
		gain = AUDIO_MIN_GAIN;
	if (gain > AUDIO_MAX_GAIN)
		gain = AUDIO_MAX_GAIN;

	AUDIO_INITINFO(&ainfo);

	ainfo.play.sample_rate = options->rate;
	ainfo.play.channels = options->format & XMP_FORMAT_MONO ? 1 : 2;

	if (options->format & XMP_FORMAT_8BIT) {
		ainfo.play.precision = 8;
		ainfo.play.precision = AUDIO_ENCODING_ULINEAR;
		options->format |= XMP_FORMAT_UNSIGNED;
	} else {
		ainfo.play.precision = 16;
		ainfo.play.precision = AUDIO_ENCODING_SLINEAR;
		options->format &= ~XMP_FORMAT_UNSIGNED;
	}

	ainfo.play.gain = gain;
	ainfo.play.buffer_size = bsize;

	if (ioctl(audio_fd, AUDIO_SETINFO, &ainfo) == -1) {
		close(audio_fd);
		return -1;
	}

	return 0;
}

FILE *out_file_open(char *outFile, int *wav_format, int rate, int mapping_family, int *channels)
{
   FILE *fout=NULL;
   /*Open output file*/
   if (strlen(outFile)==0)
   {
#if defined HAVE_SYS_SOUNDCARD_H
      int audio_fd, format, stereo;
      audio_fd=open("/dev/dsp", O_WRONLY);
      if (audio_fd<0)
      {
         perror("Cannot open /dev/dsp");
         quit(1);
      }

      format=AFMT_S16_NE;
      if (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &format)==-1)
      {
         perror("SNDCTL_DSP_SETFMT");
         close(audio_fd);
         quit(1);
      }

      stereo=0;
      if (*channels==2)
         stereo=1;
      if (ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo)==-1)
      {
         perror("SNDCTL_DSP_STEREO");
         close(audio_fd);
         quit(1);
      }
      if (stereo!=0)
      {
         if (*channels==1)
            fprintf (stderr, "Cannot set mono mode, will decode in stereo\n");
         *channels=2;
      }

      if (ioctl(audio_fd, SNDCTL_DSP_SPEED, &rate)==-1)
      {
         perror("SNDCTL_DSP_SPEED");
         close(audio_fd);
         quit(1);
      }
      fout = fdopen(audio_fd, "w");
      if(!fout)
      {
        perror("Cannot open output");
        quit(1);
      }
#elif defined HAVE_LIBSNDIO
      struct sio_par par;

      hdl = sio_open(NULL, SIO_PLAY, 0);
      if (!hdl)
      {
         fprintf(stderr, "Cannot open sndio device\n");
         quit(1);
      }

      sio_initpar(&par);
      par.sig = 1;
      par.bits = 16;
      par.rate = rate;
      par.pchan = *channels;

      if (!sio_setpar(hdl, &par) || !sio_getpar(hdl, &par) ||
        par.sig != 1 || par.bits != 16 || par.rate != rate) {
          fprintf(stderr, "could not set sndio parameters\n");
          quit(1);
      }
      *channels = par.pchan;
      if (!sio_start(hdl)) {
          fprintf(stderr, "could not start sndio\n");
          quit(1);
      }
#elif defined HAVE_SYS_AUDIOIO_H
      audio_info_t info;
      int audio_fd;

      audio_fd = open("/dev/audio", O_WRONLY);
      if (audio_fd<0)
      {
         perror("Cannot open /dev/audio");
         quit(1);
      }

      AUDIO_INITINFO(&info);
#ifdef AUMODE_PLAY    /* NetBSD/OpenBSD */
      info.mode = AUMODE_PLAY;
#endif
      info.play.encoding = AUDIO_ENCODING_SLINEAR;
      info.play.precision = 16;
      info.play.input_sample_rate = rate;
      info.play.channels = *channels;

      if (ioctl(audio_fd, AUDIO_SETINFO, &info) < 0)
      {
         perror ("AUDIO_SETINFO");
//.........这里部分代码省略.........

//.........这里部分代码省略.........
    ThreadPauseConfrm = false;
    CloseThread = false;
    StreamPause = false;

#ifndef USE_LIBAO
#ifdef WIN32
    ThreadPauseEnable = true;
    WaveOutThreadHandle = CreateThread(NULL, 0x00, &WaveOutThread, NULL, 0x00,
                                       &WaveOutThreadID);
    if(WaveOutThreadHandle == NULL)
        return 0xC8;		// CreateThread failed
    CloseHandle(WaveOutThreadHandle);

    RetVal = waveOutOpen(&hWaveOut, ((UINT)DeviceID - 1), &WaveFmt, 0x00, 0x00, CALLBACK_NULL);
    if(RetVal != MMSYSERR_NOERROR)
#else
    ThreadPauseEnable = false;
#ifdef __NetBSD__
    hWaveOut = open("/dev/audio", O_WRONLY);
#else
    hWaveOut = open("/dev/dsp", O_WRONLY);
#endif
    if (hWaveOut < 0)
#endif
#else	// ifdef USE_LIBAO
    ao_initialize();

    ThreadPauseEnable = false;
    ao_fmt.bits = WaveFmt.wBitsPerSample;
    ao_fmt.rate = WaveFmt.nSamplesPerSec;
    ao_fmt.channels = WaveFmt.nChannels;
    ao_fmt.byte_format = AO_FMT_NATIVE;
    ao_fmt.matrix = NULL;

    dev_ao = ao_open_live(ao_default_driver_id(), &ao_fmt, NULL);
    if (dev_ao == NULL)
#endif
    {
        CloseThread = true;
        return 0xC0;		// waveOutOpen failed
    }
    WaveOutOpen = true;

    //sprintf(TestStr, "Buffer 0,0:\t%p\nBuffer 0,1:\t%p\nBuffer 1,0:\t%p\nBuffer 1,1:\t%p\n",
    //		&BufferOut[0][0], &BufferOut[0][1], &BufferOut[1][0], &BufferOut[1][1]);
    //AfxMessageBox(TestStr);
#ifndef USE_LIBAO
#ifdef WIN32
    for (Cnt = 0x00; Cnt < AUDIOBUFFERU; Cnt ++)
    {
        WaveHdrOut[Cnt].lpData = BufferOut[Cnt];	// &BufferOut[Cnt][0x00];
        WaveHdrOut[Cnt].dwBufferLength = BUFFERSIZE;
        WaveHdrOut[Cnt].dwBytesRecorded = 0x00;
        WaveHdrOut[Cnt].dwUser = 0x00;
        WaveHdrOut[Cnt].dwFlags = 0x00;
        WaveHdrOut[Cnt].dwLoops = 0x00;
        WaveHdrOut[Cnt].lpNext = NULL;
        WaveHdrOut[Cnt].reserved = 0x00;
        RetVal = waveOutPrepareHeader(hWaveOut, &WaveHdrOut[Cnt], sizeof(WAVEHDR));
        WaveHdrOut[Cnt].dwFlags |= WHDR_DONE;
    }
#elif defined(__NetBSD__)
    AUDIO_INITINFO(&AudioInfo);

    AudioInfo.mode = AUMODE_PLAY;
    AudioInfo.play.sample_rate = WaveFmt.nSamplesPerSec;
    AudioInfo.play.channels = WaveFmt.nChannels;
    AudioInfo.play.precision = WaveFmt.wBitsPerSample;
    AudioInfo.play.encoding = AUDIO_ENCODING_SLINEAR;

    RetVal = ioctl(hWaveOut, AUDIO_SETINFO, &AudioInfo);
    if (RetVal)
        printf("Error setting audio information!\n");
#else
    ArgVal = (AUDIOBUFFERU << 16) | BUFSIZELD;
    RetVal = ioctl(hWaveOut, SNDCTL_DSP_SETFRAGMENT, &ArgVal);
    if (RetVal)
        printf("Error setting Fragment Size!\n");
    ArgVal = AFMT_S16_NE;
    RetVal = ioctl(hWaveOut, SNDCTL_DSP_SETFMT, &ArgVal);
    if (RetVal)
        printf("Error setting Format!\n");
    ArgVal = WaveFmt.nChannels;
    RetVal = ioctl(hWaveOut, SNDCTL_DSP_CHANNELS, &ArgVal);
    if (RetVal)
        printf("Error setting Channels!\n");
    ArgVal = WaveFmt.nSamplesPerSec;
    RetVal = ioctl(hWaveOut, SNDCTL_DSP_SPEED, &ArgVal);
    if (RetVal)
        printf("Error setting Sample Rate!\n");
#endif
#endif	// USE_LIBAO

    if (SoundLog)
        SaveFile(0x00000000, NULL);

    PauseThread = false;

    return 0x00;
}

/** 
 * Open the specified device and check capability of the opening device.
 * 
 * @param devstr [in] device string to open
 * 
 * @return TRUE on success, FALSE on failure.
 */
static boolean
adin_mic_open(char *devstr)
{
  Audio_hdr Dev_hdr, old_hdr;
  double vol;

  /* open the device */
  if ((afd = open(devstr, O_RDONLY)) == -1) {
    if (errno == EBUSY) {
      jlog("Error: adin_sun4: audio device %s is busy\n", devstr);
      return(FALSE);
    } else {
      jlog("Error: adin_sun4: unable to open %s\n",devstr);
      return(FALSE);
    }
  }

  /* set recording port to microphone */
  AUDIO_INITINFO(&ainfo);
  ainfo.record.port = AUDIO_MICROPHONE;
  if (ioctl(afd, AUDIO_SETINFO, &ainfo) == -1) {
    jlog("Error: adin_sun4: failed to set recording port\n");
    return(FALSE);
  }

  /* set recording parameters */
  if (audio_get_record_config(afd, &Dev_hdr) != AUDIO_SUCCESS) {
    jlog("Error: adin_sun4: failed to get recording config\n"); return(FALSE);
  }
  Dev_hdr.sample_rate = srate;
  Dev_hdr.samples_per_unit = 1; /* ? I don't know this param. ? */
  Dev_hdr.bytes_per_unit = 2;
  Dev_hdr.channels = 1;
  Dev_hdr.encoding = AUDIO_ENCODING_LINEAR;
  if (audio_set_record_config(afd, &Dev_hdr) != AUDIO_SUCCESS) {
    jlog("Error: adin_sun4: failed to set recording config\n"); return(FALSE);
  }

  /* set volume */
  vol = (float)volume / (float)100;
  if (audio_set_record_gain(afd, &vol) != AUDIO_SUCCESS) {
    jlog("Error: adin_sun4: failed to set recording volume\n");
    return(FALSE);
  }

  /* flush buffer */
  if((ioctl(afd , I_FLUSH , FLUSHRW)) == -1) {
    jlog("Error: adin_sun4: cannot flush input buffer\n");
    return(FALSE);
  }
  
  /* setup polling */
  pfd.fd = afd;
  pfd.events = POLLIN;

#if 0
  /* pause transfer */
  if (audio_pause_record(afd) == AUDIO_ERR_NOEFFECT) {
    jlog("Error: adin_sun4: cannot pause audio\n");
    return(FALSE);
  }
#endif

  return(TRUE);
}

static int sun_audio_getinfo(audio_info_t *auinfo)
{
    AUDIO_INITINFO(auinfo);
    return ioctl(audioctl_fd, AUDIO_GETINFO, auinfo);
}