Some io plug-ins might want to adjust the reported delay value and not strictly follow the current buffer usage (that's why we have two calls after all). Allow them to specify a delay() callback and use the previous behaviour if they don't. Signed-off-by: Pierre Ossman <ossman@xxxxxxxxx>
? ioplug-delay.patch
Index: include/pcm_ioplug.h
===================================================================
RCS file: /cvsroot/alsa/alsa-lib/include/pcm_ioplug.h,v
retrieving revision 1.5
diff -u -r1.5 pcm_ioplug.h
--- include/pcm_ioplug.h 24 May 2005 09:42:01 -0000 1.5
+++ include/pcm_ioplug.h 25 May 2006 19:05:23 -0000
@@ -130,6 +130,10 @@
*/
snd_pcm_sframes_t (*pointer)(snd_pcm_ioplug_t *io);
/**
+ * get the delay for the running PCM; optional
+ */
+ int (*delay)(snd_pcm_ioplug_t *io, snd_pcm_sframes_t *delayp);
+ /**
* transfer the data; optional
*/
snd_pcm_sframes_t (*transfer)(snd_pcm_ioplug_t *io,
Index: src/pcm/pcm_ioplug.c
===================================================================
RCS file: /cvsroot/alsa/alsa-lib/src/pcm/pcm_ioplug.c,v
retrieving revision 1.10
diff -u -r1.10 pcm_ioplug.c
--- src/pcm/pcm_ioplug.c 28 Jun 2005 10:24:45 -0000 1.10
+++ src/pcm/pcm_ioplug.c 25 May 2006 19:05:24 -0000
@@ -106,8 +106,14 @@
static int snd_pcm_ioplug_delay(snd_pcm_t *pcm, snd_pcm_sframes_t *delayp)
{
- snd_pcm_ioplug_hw_ptr_update(pcm);
- *delayp = snd_pcm_mmap_hw_avail(pcm);
+ ioplug_priv_t *io = pcm->private_data;
+
+ if (io->data->callback->delay)
+ return io->data->callback->delay(io->data, delayp);
+ else {
+ snd_pcm_ioplug_hw_ptr_update(pcm);
+ *delayp = snd_pcm_mmap_hw_avail(pcm);
+ }
return 0;
}
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