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authorJaroslav Kysela <perex@perex.cz>2009-04-27 09:44:40 +0200
committerTakashi Iwai <tiwai@suse.de>2009-05-29 11:47:33 +0200
commit8bea869c5e56234990e6bad92a543437115bfc18 (patch)
tree7d0a5c4eeeeb69623066eccb363f35e0f2e3fda6 /include/sound
parente93721a70263afefbac781f575bfe851c6f95d84 (diff)
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 'include/sound')
-rw-r--r--include/sound/asound.h1
-rw-r--r--include/sound/pcm.h1
2 files changed, 2 insertions, 0 deletions
diff --git a/include/sound/asound.h b/include/sound/asound.h
index 6add80fc251..82aed3f4753 100644
--- a/include/sound/asound.h
+++ b/include/sound/asound.h
@@ -255,6 +255,7 @@ typedef int __bitwise snd_pcm_subformat_t;
#define SNDRV_PCM_INFO_HALF_DUPLEX 0x00100000 /* only half duplex */
#define SNDRV_PCM_INFO_JOINT_DUPLEX 0x00200000 /* playback and capture stream are somewhat correlated */
#define SNDRV_PCM_INFO_SYNC_START 0x00400000 /* pcm support some kind of sync go */
+#define SNDRV_PCM_INFO_FIFO_IN_FRAMES 0x80000000 /* internal kernel flag - FIFO size is in frames */
typedef int __bitwise snd_pcm_state_t;
#define SNDRV_PCM_STATE_OPEN ((__force snd_pcm_state_t) 0) /* stream is open */
diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index 267effddb07..8a69b5c1e1c 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -98,6 +98,7 @@ struct snd_pcm_ops {
#define SNDRV_PCM_IOCTL1_INFO 1
#define SNDRV_PCM_IOCTL1_CHANNEL_INFO 2
#define SNDRV_PCM_IOCTL1_GSTATE 3
+#define SNDRV_PCM_IOCTL1_FIFO_SIZE 4
#define SNDRV_PCM_TRIGGER_STOP 0
#define SNDRV_PCM_TRIGGER_START 1