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| author | Takashi Iwai <tiwai@suse.de> | 2009-09-10 15:32:51 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2009-09-10 15:32:51 +0200 |
| commit | 6a0f4021469727675b83d85ac91d106bfae0e2c3 (patch) | |
| tree | c6d7ffd99db592f4b7c294d1a5a7b54284012673 /Documentation | |
| parent | f9892a52e2405b4c5fa205d4f18ad292cb7e40bb (diff) | |
| parent | b888d1ce82ebd2bafecf64c765754968e78b4228 (diff) | |
Merge branch 'topic/dummy' into for-linus
* topic/dummy:
ALSA: dummy - Increase MAX_PCM_SUBSTREAMS to 128
ALSA: dummy - Add debug proc file
ALSA: Add const prefix to proc helper functions
ALSA: Re-export snd_pcm_format_name() function
ALSA: dummy - Fake buffer allocations
ALSA: dummy - Fix the timer calculation in systimer mode
ALSA: dummy - Add more description
ALSA: dummy - Better jiffies handling
ALSA: dummy - Support high-res timer mode
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/sound/alsa/ALSA-Configuration.txt | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/Documentation/sound/alsa/ALSA-Configuration.txt b/Documentation/sound/alsa/ALSA-Configuration.txt index 4252697a95d6..ea16e7d184a4 100644 --- a/Documentation/sound/alsa/ALSA-Configuration.txt +++ b/Documentation/sound/alsa/ALSA-Configuration.txt @@ -513,6 +513,26 @@ Prior to version 0.9.0rc4 options had a 'snd_' prefix. This was removed. or input, but you may use this module for any application which requires a sound card (like RealPlayer). + pcm_devs - Number of PCM devices assigned to each card + (default = 1, up to 4) + pcm_substreams - Number of PCM substreams assigned to each PCM + (default = 8, up to 16) + hrtimer - Use hrtimer (=1, default) or system timer (=0) + fake_buffer - Fake buffer allocations (default = 1) + + When multiple PCM devices are created, snd-dummy gives different + behavior to each PCM device: + 0 = interleaved with mmap support + 1 = non-interleaved with mmap support + 2 = interleaved without mmap + 3 = non-interleaved without mmap + + As default, snd-dummy drivers doesn't allocate the real buffers + but either ignores read/write or mmap a single dummy page to all + buffer pages, in order to save the resouces. If your apps need + the read/ written buffer data to be consistent, pass fake_buffer=0 + option. + The power-management is supported. Module snd-echo3g |