[vorbis-dev] libao patch

[Mark Schreiber]

I hope this is the right place to submit libao patches -- the
freshmeat page points to ogg vorbis as the homepage for libao.

Currently, at least on my system (SB Live Value!, ALSA .9 branch),
stuff going to alsa sounds *awful* because of too-small buffers.
mpg321 and similar programs are unusable, and none of them seem to
want to let you set the buffer size.  This patch lets an environment
variable set the default buffer size.

After applying this patch, "export AO_ALSA_BUFFER_SIZE=8000" makes
things sound fine on my system, w/o an excessive amount of latency.

I'm not on this list, so replies intended to go to me should be cc'd.


-- 
Best of luck,
Mark Schreiber


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diff -ur libao-0.8.2/src/plugins/alsa09/ao_alsa09.c libao-0.8.2-new/src/plugins/alsa09/ao_alsa09.c
--- libao-0.8.2/src/plugins/alsa09/ao_alsa09.c	Tue Dec 18 17:39:24 2001
+++ libao-0.8.2-new/src/plugins/alsa09/ao_alsa09.c	Sat Apr 20 21:41:39 2002
@@ -90,17 +90,33 @@
 	return &ao_alsa_info;
 }
 
+static int get_alsa_environment_buf_size(void)
+{
+	char * buf;
+   
+	buf = getenv("AO_ALSA_BUFFER_SIZE");
+	if (buf == NULL)
+		return 0;
+	else
+		return strtol(buf, NULL, 10);
+}
 
 int ao_plugin_device_init(ao_device *device)
 {
 	ao_alsa_internal *internal;
+	int buf_size_env;
 
 	internal = (ao_alsa_internal *) malloc(sizeof(ao_alsa_internal));
 
-	if (internal == NULL)	
+	if (internal == NULL)
 		return 0; /* Could not initialize device memory */
 	
-	internal->buf_size = AO_ALSA_BUF_SIZE;
+	buf_size_env = get_alsa_environment_buf_size();
+	if (buf_size_env)
+		internal->buf_size = buf_size_env;
+	else
+		internal->buf_size = AO_ALSA_BUF_SIZE;
+   
 	internal->periods = AO_ALSA_PERIODS;
 	internal->dev = strdup ("default");
 	if (!internal->dev) {
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