28febcfea9
git-svn-id: svn://svn.code.sf.net/p/bitchx/code/tags/ircii-pana-1.1-final@1 13b04d17-f746-0410-82c6-800466cd88b0
148 lines
3.4 KiB
C
148 lines
3.4 KiB
C
/* this file is a part of amp software, (C) tomislav uzelac 1996,1997
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Origional code by: tomislav uzelac
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Modified by:
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* Dan Nelson - BSD mods.
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* Andrew Richards - moved code from audio.c and added mixer support etc
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*/
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/* Support for Linux and BSD sound devices */
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#include "amp.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdio.h>
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#include "audioIO.h"
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#ifdef HAVE_MACHINE_SOUNDCARD_H
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#include <machine/soundcard.h>
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#elif defined(HAVE_LINUX_SOUNDCARD_H)
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#include <linux/soundcard.h>
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#elif defined(HAVE_SYS_SOUNDCARD_H)
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#include <sys/soundcard.h>
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#else
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#define NO_SOUNCARD_H
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#endif
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#ifndef NO_SOUNCARD_H
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/* optimal fragment size */
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int AUSIZ = 0;
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/* declare these static to effectively isolate the audio device */
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static int audio_fd;
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static int mixer_fd;
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static int volumeIoctl;
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/* audioOpen() */
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/* should open the audio device, perform any special initialization */
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/* Set the frequency, no of channels and volume. Volume is only set if */
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/* it is not -1 */
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void
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audioOpen(int frequency, int stereo, int volume)
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{
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int supportedMixers, play_format=AFMT_S16_LE;
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if ((audio_fd = open ("/dev/dsp", O_WRONLY, 0)) == -1)
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die("Unable to open the audio device\n");
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if (ioctl(audio_fd, SNDCTL_DSP_SETFMT,&play_format) < 0)
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die("Unable to set required audio format\n");
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if ((mixer_fd=open("/dev/mixer",O_RDWR)) == -1)
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warn("Unable to open mixer device\n");
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if (ioctl(mixer_fd, SOUND_MIXER_READ_DEVMASK, &supportedMixers) == -1) {
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warn("Unable to get mixer info assuming master volume\n");
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volumeIoctl=SOUND_MIXER_WRITE_VOLUME;
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} else {
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if ((supportedMixers & SOUND_MASK_PCM) != 0)
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volumeIoctl=SOUND_MIXER_WRITE_PCM;
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else
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volumeIoctl=0;
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}
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/* Set 1 or 2 channels */
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stereo=(stereo ? 1 : 0);
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if (ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo) < 0)
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die("Unable to set stereo/mono\n");
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/* Set the output frequency */
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if (ioctl(audio_fd, SNDCTL_DSP_SPEED, &frequency) < 0)
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die("Unable to set frequency: %d\n",frequency);
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if (volume != -1)
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audioSetVolume(volume);
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if (ioctl(audio_fd, SNDCTL_DSP_GETBLKSIZE, &AUSIZ) == -1)
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die("Unable to get fragment size\n");
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}
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/* audioSetVolume - only code this if your system can change the volume while */
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/* playing. sets the output volume 0-100 */
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void
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audioSetVolume(int volume)
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{
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volume=(volume<<8)+volume;
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if ((mixer_fd != -1) && (volumeIoctl!=0))
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if (ioctl(mixer_fd, volumeIoctl, &volume) < 0)
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warn("Unable to set sound volume\n");
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}
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/* audioFlush() */
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/* should flush the audio device */
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inline void
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audioFlush()
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{
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if (ioctl(audio_fd, SNDCTL_DSP_RESET, 0) == -1)
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die("Unable to reset audio device\n");
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}
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/* audioClose() */
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/* should close the audio device and perform any special shutdown */
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void
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audioClose()
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{
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close(audio_fd);
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if (mixer_fd != -1)
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close(mixer_fd);
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}
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/* audioWrite */
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/* writes count bytes from buffer to the audio device */
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/* returns the number of bytes actually written */
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inline int
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audioWrite(char *buffer, int count)
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{
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return(write(audio_fd,buffer,count));
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}
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/* Let buffer.c have the audio descriptor so it can select on it. This means */
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/* that the program is dependent on a file descriptor to work. Should really */
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/* move the select's etc (with inlines of course) in here so that this is the */
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/* ONLY file which has hardware dependent audio stuff in it */
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int
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getAudioFd()
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{
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return(audio_fd);
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}
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#endif
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