mirror of
https://github.com/RaySollium99/picodrive.git
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e5ab6fafac
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@599 be3aeb3a-fb24-0410-a615-afba39da0efa
96 lines
2.1 KiB
C
96 lines
2.1 KiB
C
/* sound output via OSS */
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/soundcard.h>
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#include <unistd.h>
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#include "sndout_oss.h"
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static int sounddev = -1, mixerdev = -1;
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int sndout_oss_init(void)
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{
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if (mixerdev >= 0) close(mixerdev);
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mixerdev = open("/dev/mixer", O_RDWR);
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if (mixerdev == -1)
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{
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perror("open(\"/dev/mixer\")");
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}
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return 0;
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}
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int sndout_oss_start(int rate, int bits, int stereo)
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{
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static int s_oldrate = 0, s_oldbits = 0, s_oldstereo = 0;
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int frag = 0, bsize, buffers, ret;
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// if no settings change, we don't need to do anything,
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// since audio is never stopped
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if (rate == s_oldrate && s_oldbits == bits && s_oldstereo == stereo)
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return 0;
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if (sounddev >= 0) close(sounddev);
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sounddev = open("/dev/dsp", O_WRONLY|O_ASYNC);
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if (sounddev == -1)
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{
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perror("open(\"/dev/dsp\")");
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return -1;
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}
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// calculate buffer size
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// this is tuned for GP2X
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buffers = 16;
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bsize = rate / 32;
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if (rate > 22050) { bsize*=4; buffers*=2; }
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while ((bsize>>=1)) frag++;
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frag |= buffers<<16; // 16 buffers
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ret = ioctl(sounddev, SNDCTL_DSP_SETFRAGMENT, &frag);
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if (ret) perror("SNDCTL_DSP_SETFRAGMENT failed");
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ret = ioctl(sounddev, SNDCTL_DSP_STEREO, &stereo);
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ret |= ioctl(sounddev, SNDCTL_DSP_SETFMT, &bits);
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ret |= ioctl(sounddev, SNDCTL_DSP_SPEED, &rate);
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if (ret) printf("failed to set audio format\n");
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usleep(192*1024);
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printf("gp2x_set_sound: %i/%ibit/%s, %i buffers of %i bytes\n",
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rate, bits, stereo?"stereo":"mono", frag>>16, 1<<(frag&0xffff));
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s_oldrate = rate; s_oldbits = bits; s_oldstereo = stereo;
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return 0;
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}
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int sndout_oss_write(const void *buff, int len)
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{
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return write(sounddev, buff, len);
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}
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void sndout_oss_sync(void)
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{
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ioctl(sounddev, SOUND_PCM_SYNC, 0);
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}
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void sndout_oss_setvol(int l, int r)
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{
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if (mixerdev < 0) return;
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l=l<0?0:l; l=l>255?255:l; r=r<0?0:r; r=r>255?255:r;
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l<<=8; l|=r;
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ioctl(mixerdev, SOUND_MIXER_WRITE_PCM, &l); /*SOUND_MIXER_WRITE_VOLUME*/
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}
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void sndout_oss_exit(void)
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{
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if (sounddev >= 0) close(sounddev); sounddev = -1;
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if (mixerdev >= 0) close(mixerdev); mixerdev = -1;
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}
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