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| author |   Jaroslav Kysela <perex@perex.cz> | 2009-04-27 09:44:40 +0200 |
|---|---|---|
| committer |   Takashi Iwai <tiwai@suse.de> | 2009-05-29 11:47:33 +0200 |
| commit | 8bea869c5e56234990e6bad92a543437115bfc18 (patch) | |
| tree | 7d0a5c4eeeeb69623066eccb363f35e0f2e3fda6 /sound/core/pcm_lib.c | |
| parent | Merge branch 'fix/pcm-jiffies-check' into topic/pcm-jiffies-check (diff) | |
| download | linux-dev-8bea869c5e56234990e6bad92a543437115bfc18.tar.xz linux-dev-8bea869c5e56234990e6bad92a543437115bfc18.zip | |
ALSA: PCM midlevel: improve fifo_size handling
Move the fifo_size assignment to hw->ioctl callback to allow lowlevel
drivers overwrite the default behaviour.
fifo_size is in frames not bytes as specified in asound.h and alsa-lib's
documentation, but most hardware have fixed byte based FIFOs. Introduce
internal SNDRV_PCM_INFO_FIFO_IN_FRAMES.
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core/pcm_lib.c')
| -rw-r--r-- | sound/core/pcm_lib.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c index d659995ac3ac..adc2b0bd1132 100644 --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c @@ -1524,6 +1524,23 @@ static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream, return 0; } +static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream, + void *arg) +{ + struct snd_pcm_hw_params *params = arg; + snd_pcm_format_t format; + int channels, width; + + params->fifo_size = substream->runtime->hw.fifo_size; + if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) { + format = params_format(params); + channels = params_channels(params); + width = snd_pcm_format_physical_width(format); + params->fifo_size /= width * channels; + } + return 0; +} + /** * snd_pcm_lib_ioctl - a generic PCM ioctl callback * @substream: the pcm substream instance @@ -1545,6 +1562,8 @@ int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream, return snd_pcm_lib_ioctl_reset(substream, arg); case SNDRV_PCM_IOCTL1_CHANNEL_INFO: return snd_pcm_lib_ioctl_channel_info(substream, arg); + case SNDRV_PCM_IOCTL1_FIFO_SIZE: + return snd_pcm_lib_ioctl_fifo_size(substream, arg); } return -ENXIO; } |