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authorTakashi Iwai <tiwai@suse.de>2005-09-08 13:48:34 +0200
committerJaroslav Kysela <perex@suse.cz>2005-09-12 10:47:37 +0200
commit10f69f9e42833b82288882d10901dc86adc3e473 (patch)
treeed2767c07158e36cf2eba4127a9d986428b2e89a
parentf328385309f310626751c54f694641459e2d4582 (diff)
downloadop-kernel-dev-10f69f9e42833b82288882d10901dc86adc3e473.zip
op-kernel-dev-10f69f9e42833b82288882d10901dc86adc3e473.tar.gz
[ALSA] pcm-oss - Add bugg-yptr option
Documentation,ALSA<-OSS emulation Added 'buggy-ptr' proc option to switch the behavior of GETOPTR ioctl. Signed-off-by: Takashi Iwai <tiwai@suse.de>
-rw-r--r--Documentation/sound/alsa/ALSA-Configuration.txt2
-rw-r--r--include/sound/pcm_oss.h3
-rw-r--r--sound/core/oss/pcm_oss.c8
3 files changed, 11 insertions, 2 deletions
diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt
index a7fc75f..57e82a5 100644
--- a/Documentation/sound/alsa/ALSA-Configuration.txt
+++ b/Documentation/sound/alsa/ALSA-Configuration.txt
@@ -1592,6 +1592,8 @@ Proc interfaces (/proc/asound)
- whole-frag write only whole fragments (optimization affecting
playback only)
- no-silence do not fill silence ahead to avoid clicks
+ - buggy-ptr Returns the whitespace blocks in GETOPTR ioctl
+ instead of filled blocks
Example: echo "x11amp 128 16384" > /proc/asound/card0/pcm0p/oss
echo "squake 0 0 disable" > /proc/asound/card0/pcm0c/oss
diff --git a/include/sound/pcm_oss.h b/include/sound/pcm_oss.h
index 5187285..0b67c9d 100644
--- a/include/sound/pcm_oss.h
+++ b/include/sound/pcm_oss.h
@@ -32,7 +32,8 @@ struct _snd_pcm_oss_setup {
block:1,
nonblock:1,
partialfrag:1,
- nosilence:1;
+ nosilence:1,
+ buggyptr:1;
unsigned int periods;
unsigned int period_size;
snd_pcm_oss_setup_t *next;
diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c
index 1e60639..a038fd8 100644
--- a/sound/core/oss/pcm_oss.c
+++ b/sound/core/oss/pcm_oss.c
@@ -1543,7 +1543,11 @@ static int snd_pcm_oss_get_ptr(snd_pcm_oss_file_t *pcm_oss_file, int stream, str
} else {
delay = snd_pcm_oss_bytes(substream, delay);
if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
- info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes;
+ snd_pcm_oss_setup_t *setup = substream->oss.setup;
+ if (setup && setup->buggyptr)
+ info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes;
+ else
+ info.blocks = (delay + fixup) / runtime->oss.period_bytes;
info.bytes = (runtime->oss.bytes - delay) & INT_MAX;
} else {
delay += fixup;
@@ -2350,6 +2354,8 @@ static void snd_pcm_oss_proc_write(snd_info_entry_t *entry,
template.partialfrag = 1;
} else if (!strcmp(str, "no-silence")) {
template.nosilence = 1;
+ } else if (!strcmp(str, "buggy-ptr")) {
+ template.buggyptr = 1;
}
} while (*str);
if (setup == NULL) {
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