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oss code refactoring, sound for frame unlim mode

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive/platform@735 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2009-08-05 22:29:46 +00:00
parent 7bc9a680a2
commit dd59a74b20
4 changed files with 80 additions and 40 deletions
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79
linux/sndout_oss.c
View file

@ -10,6 +10,8 @@
#include "sndout_oss.h"
static int sounddev = -1, mixerdev = -1;
static int can_write_safe;
int sndout_oss_init(void)
{
@ -23,18 +25,21 @@ int sndout_oss_init(void)
return 0;
}
int sndout_oss_start(int rate, int bits, int stereo)
int sndout_oss_start(int rate, int frame_samples, int stereo)
{
static int s_oldrate = 0, s_oldbits = 0, s_oldstereo = 0;
int frag = 0, bsize, buffers, ret;
static int s_oldrate = 0, s_old_fsamples = 0, s_oldstereo = 0;
int frag, bsize, bits, 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)
if (rate == s_oldrate && s_old_fsamples == frame_samples && s_oldstereo == stereo)
return 0;
if (sounddev >= 0) close(sounddev);
if (sounddev >= 0) {
ioctl(sounddev, SOUND_PCM_SYNC, 0);
close(sounddev);
}
sounddev = open("/dev/dsp", O_WRONLY|O_ASYNC);
if (sounddev == -1)
{
@ -42,42 +47,67 @@ int sndout_oss_start(int rate, int bits, int stereo)
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");
// calculate buffer size. We one to fit 1 frame worth of sound data.
// Also ignore mono because both GP2X and Wiz mixes mono to stereo anyway.
bsize = frame_samples << 2;
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");
for (frag = 0; bsize; bsize >>= 1, frag++)
;
frag |= 16 << 16; // fragment count
ret = ioctl(sounddev, SNDCTL_DSP_SETFRAGMENT, &frag);
if (ret < 0)
perror("SNDCTL_DSP_SETFRAGMENT failed");
bits = 16;
ret = ioctl(sounddev, SNDCTL_DSP_STEREO, &stereo);
if (ret == 0)
ret = ioctl(sounddev, SNDCTL_DSP_SETFMT, &bits);
if (ret == 0)
ret = ioctl(sounddev, SNDCTL_DSP_SPEED, &rate);
if (ret < 0)
perror("failed to set audio format");
// not sure if this is still needed (avoiding driver bugs?)
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));
printf("sndout_oss_start: %d/%dbit/%s, %d buffers of %i bytes\n",
rate, bits, stereo ? "stereo" : "mono", frag >> 16, 1 << (frag & 0xffff));
s_oldrate = rate; s_oldbits = bits; s_oldstereo = stereo;
s_oldrate = rate; s_old_fsamples = frame_samples; s_oldstereo = stereo;
can_write_safe = 0;
return 0;
}
int sndout_oss_write(const void *buff, int len)
{
return write(sounddev, buff, len);
}
int sndout_oss_can_write(int bytes)
{
audio_buf_info bi;
int ret;
#ifdef __GP2X__
// note: SNDCTL_DSP_GETOSPACE crashes F100 kernel for some reason
// if called too early, so we work around here
if (can_write_safe++ < 8)
return 1;
#endif
ret = ioctl(sounddev, SNDCTL_DSP_GETOSPACE, &bi);
if (ret < 0)
return 1;
// have enough bytes to write + 4 extra frags
return bi.bytes - bi.fragsize * 4 >= bytes ? 1 : 0;
}
void sndout_oss_sync(void)
{
ioctl(sounddev, SOUND_PCM_SYNC, 0);
}
void sndout_oss_setvol(int l, int r)
{
if (mixerdev < 0) return;
@ -87,7 +117,6 @@ void sndout_oss_setvol(int l, int r)
ioctl(mixerdev, SOUND_MIXER_WRITE_PCM, &l); /*SOUND_MIXER_WRITE_VOLUME*/
}
void sndout_oss_exit(void)
{
if (sounddev >= 0) close(sounddev); sounddev = -1;

3
linux/sndout_oss.h
View file

@ -1,6 +1,7 @@
int sndout_oss_init(void);
int sndout_oss_start(int rate, int bits, int stereo);
int sndout_oss_start(int rate, int frame_samples, int stereo);
int sndout_oss_write(const void *buff, int len);
int sndout_oss_can_write(int bytes);
void sndout_oss_sync(void);
void sndout_oss_setvol(int l, int r);
void sndout_oss_exit(void);