Update of /cvsroot/alsa/alsa-kernel/core/oss
In directory sc8-pr-cvs1:/tmp/cvs-serv4141
Modified Files:
pcm_plugin.c
Log Message:
Added rate_match() function to ignore very close rate resampling requests
Index: pcm_plugin.c
===================================================================
RCS file: /cvsroot/alsa/alsa-kernel/core/oss/pcm_plugin.c,v
retrieving revision 1.10
retrieving revision 1.11
diff -u -r1.10 -r1.11
--- pcm_plugin.c 7 Feb 2003 08:29:08 -0000 1.10
+++ pcm_plugin.c 21 Jul 2003 12:36:10 -0000 1.11
@@ -56,6 +56,17 @@
return 0;
}
+/*
+ * because some cards might have rates "very close", we ignore
+ * all "resampling" requests within +-5%
+ */
+static int rate_match(unsigned int src_rate, unsigned int dst_rate)
+{
+ unsigned int low = (src_rate * 95) / 100;
+ unsigned int high = (src_rate * 105) / 105;
+ return dst_rate >= low && dst_rate <= high;
+}
+
static int snd_pcm_plugin_alloc(snd_pcm_plugin_t *plugin, snd_pcm_uframes_t frames)
{
snd_pcm_plugin_format_t *format;
@@ -420,7 +431,7 @@
/* Format change (linearization) */
if ((srcformat.format != dstformat.format ||
- srcformat.rate != dstformat.rate ||
+ !rate_match(srcformat.rate, dstformat.rate) ||
srcformat.channels != dstformat.channels) &&
!snd_pcm_format_linear(srcformat.format)) {
if (snd_pcm_format_linear(dstformat.format))
@@ -468,7 +479,7 @@
ttable[v * sv + v] = FULL;
}
tmpformat.channels = dstformat.channels;
- if (srcformat.rate == dstformat.rate &&
+ if (rate_match(srcformat.rate, dstformat.rate) &&
snd_pcm_format_linear(dstformat.format))
tmpformat.format = dstformat.format;
err = snd_pcm_plugin_build_route(plug,
@@ -490,7 +501,7 @@
}
/* rate resampling */
- if (srcformat.rate != dstformat.rate) {
+ if (!rate_match(srcformat.rate, dstformat.rate)) {
tmpformat.rate = dstformat.rate;
if (srcformat.channels == dstformat.channels &&
snd_pcm_format_linear(dstformat.format))
-------------------------------------------------------
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