mirror of
https://github.com/RaySollium99/picodrive.git
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c32f841a6e
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@883 be3aeb3a-fb24-0410-a615-afba39da0efa
137 lines
3 KiB
C
137 lines
3 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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static int can_write_safe;
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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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void sndout_oss_stop(void)
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{
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if (sounddev < 0)
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return;
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ioctl(sounddev, SOUND_PCM_SYNC, 0);
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close(sounddev);
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sounddev = -1;
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}
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int sndout_oss_start(int rate, int frame_samples, int stereo)
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{
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static int s_oldrate = 0, s_old_fsamples = 0, s_oldstereo = 0;
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int frag, bsize, bits, ret;
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// GP2X: if no settings change, we don't need to do anything,
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// since audio is never stopped there
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if (sounddev >= 0 && rate == s_oldrate && s_old_fsamples == frame_samples && s_oldstereo == stereo)
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return 0;
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sndout_oss_stop();
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sounddev = open("/dev/dsp", O_WRONLY);
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if (sounddev == -1)
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{
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perror("open(\"/dev/dsp\")");
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sounddev = open("/dev/dsp1", O_WRONLY);
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if (sounddev == -1) {
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perror("open(\"/dev/dsp1\")");
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return -1;
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}
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}
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// calculate buffer size. We want to fit 1 frame worth of sound data.
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// Also ignore mono because both GP2X and Wiz mixes mono to stereo anyway.
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bsize = frame_samples << 2;
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for (frag = 0; bsize; bsize >>= 1, frag++)
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;
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frag |= 16 << 16; // fragment count
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ret = ioctl(sounddev, SNDCTL_DSP_SETFRAGMENT, &frag);
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if (ret < 0)
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perror("SNDCTL_DSP_SETFRAGMENT failed");
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bits = 16;
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ret = ioctl(sounddev, SNDCTL_DSP_STEREO, &stereo);
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if (ret == 0)
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ret = ioctl(sounddev, SNDCTL_DSP_SETFMT, &bits);
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if (ret == 0)
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ret = ioctl(sounddev, SNDCTL_DSP_SPEED, &rate);
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if (ret < 0)
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perror("failed to set audio format");
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#ifdef __GP2X__
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// not sure if this is still needed (avoiding driver bugs?)
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usleep(192*1024);
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#endif
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printf("sndout_oss_start: %d/%dbit/%s, %d 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_old_fsamples = frame_samples; s_oldstereo = stereo;
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can_write_safe = 0;
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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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int sndout_oss_can_write(int bytes)
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{
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audio_buf_info bi;
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int ret;
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#ifdef __GP2X__
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// note: SNDCTL_DSP_GETOSPACE crashes F100 kernel for some reason
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// if called too early, so we work around here
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if (can_write_safe++ < 8)
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return 1;
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#endif
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ret = ioctl(sounddev, SNDCTL_DSP_GETOSPACE, &bi);
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if (ret < 0)
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return 1;
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// have enough bytes to write + 4 extra frags
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return bi.bytes - bi.fragsize * 4 >= bytes ? 1 : 0;
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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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