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extracted OSS code to sndout_oss_*, BTN->PBTN, refactoring

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive/platform@599 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2008-10-17 15:29:37 +00:00
parent 725d7f6c16
commit b3972d826f
21 changed files with 386 additions and 478 deletions
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96
linux/sndout_oss.c Normal file
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/* sound output via OSS */
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/soundcard.h>
#include <unistd.h>
#include "sndout_oss.h"
static int sounddev = -1, mixerdev = -1;
int sndout_oss_init(void)
{
if (mixerdev >= 0) close(mixerdev);
mixerdev = open("/dev/mixer", O_RDWR);
if (mixerdev == -1)
{
perror("open(\"/dev/mixer\")");
}
return 0;
}
int sndout_oss_start(int rate, int bits, int stereo)
{
static int s_oldrate = 0, s_oldbits = 0, s_oldstereo = 0;
int frag = 0, bsize, buffers, ret;
// if no settings change, we don't need to do anything,
// since audio is never stopped
if (rate == s_oldrate && s_oldbits == bits && s_oldstereo == stereo)
return 0;
if (sounddev >= 0) close(sounddev);
sounddev = open("/dev/dsp", O_WRONLY|O_ASYNC);
if (sounddev == -1)
{
perror("open(\"/dev/dsp\")");
return -1;
}
// calculate buffer size
// this is tuned for GP2X
buffers = 16;
bsize = rate / 32;
if (rate > 22050) { bsize*=4; buffers*=2; }
while ((bsize>>=1)) frag++;
frag |= buffers<<16; // 16 buffers
ret = ioctl(sounddev, SNDCTL_DSP_SETFRAGMENT, &frag);
if (ret) perror("SNDCTL_DSP_SETFRAGMENT failed");
ret = ioctl(sounddev, SNDCTL_DSP_STEREO, &stereo);
ret |= ioctl(sounddev, SNDCTL_DSP_SETFMT, &bits);
ret |= ioctl(sounddev, SNDCTL_DSP_SPEED, &rate);
if (ret) printf("failed to set audio format\n");
usleep(192*1024);
printf("gp2x_set_sound: %i/%ibit/%s, %i buffers of %i bytes\n",
rate, bits, stereo?"stereo":"mono", frag>>16, 1<<(frag&0xffff));
s_oldrate = rate; s_oldbits = bits; s_oldstereo = stereo;
return 0;
}
int sndout_oss_write(const void *buff, int len)
{
return write(sounddev, buff, len);
}
void sndout_oss_sync(void)
{
ioctl(sounddev, SOUND_PCM_SYNC, 0);
}
void sndout_oss_setvol(int l, int r)
{
if (mixerdev < 0) return;
l=l<0?0:l; l=l>255?255:l; r=r<0?0:r; r=r>255?255:r;
l<<=8; l|=r;
ioctl(mixerdev, SOUND_MIXER_WRITE_PCM, &l); /*SOUND_MIXER_WRITE_VOLUME*/
}
void sndout_oss_exit(void)
{
if (sounddev >= 0) close(sounddev); sounddev = -1;
if (mixerdev >= 0) close(mixerdev); mixerdev = -1;
}