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make OSS detect blocking, adjust audio API

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive/platform@898 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2010-09-18 16:40:13 +00:00
parent b6eccda317
commit a33164fffe
8 changed files with 81 additions and 90 deletions
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36
linux/sndout_oss.c
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@ -98,6 +98,42 @@ int sndout_oss_write(const void *buff, int len)
return write(sounddev, buff, len);
}
#include "../common/plat.h"
/* not really non-blocking, just detects if blocking occurs
* and starts skipping writes in case it does. */
int sndout_oss_write_nb(const void *buff, int len)
{
static int lag_counter, skip_counter;
unsigned int t;
int ret;
if (lag_counter > 2) {
// skip writes if audio starts blocking
lag_counter = 0;
skip_counter = FRAG_COUNT;
}
if (skip_counter > 0) {
skip_counter--;
return len;
}
t = plat_get_ticks_ms();
ret = sndout_oss_write(buff, len);
t = plat_get_ticks_ms() - t;
if (t > 1) {
// this shouldn't really happen, most likely audio is out of sync
lag_counter++;
if (lag_counter > 2)
printf("audio lag %u\n", t);
}
else
lag_counter = 0;
return ret;
}
int sndout_oss_can_write(int bytes)
{
audio_buf_info bi;