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| author | Takashi Iwai <tiwai@suse.de> | 2005-09-08 13:48:34 +0200 |
|---|---|---|
| committer | Jaroslav Kysela <perex@suse.cz> | 2005-09-12 10:47:37 +0200 |
| commit | 10f69f9e42833b82288882d10901dc86adc3e473 (patch) | |
| tree | ed2767c07158e36cf2eba4127a9d986428b2e89a | |
| parent | [ALSA] powermac - Add AUTO_DRC config (diff) | |
| download | linux-10f69f9e42833b82288882d10901dc86adc3e473.tar.xz linux-10f69f9e42833b82288882d10901dc86adc3e473.zip | |
[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.txt | 2 | ||||
| -rw-r--r-- | include/sound/pcm_oss.h | 3 | ||||
| -rw-r--r-- | sound/core/oss/pcm_oss.c | 8 |
3 files changed, 11 insertions, 2 deletions
diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt index a7fc75f53bbe..57e82a5fae71 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 518728536bc6..0b67c9d105af 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 1e606399d74a..a038fd8a53f3 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) { |