kernel.git/sound/core/pcm_lib.c, branch linux-3.7.y

ALSA: Fix leftover chmap UNKNOWN -> MONO conversions

2012-09-13T12:48:46Z

A few files have been slipped from the previous commit to add MONO channel type. Signed-off-by: Takashi Iwai

ALSA: pcm - Use UNKNOWN chmap for mono streams

2012-09-11T12:24:43Z

In general, mono streams have no dedicated speaker assignment, thus they should be rather marked as UNKNOWN position. Signed-off-by: Takashi Iwai

ALSA: Remove VOLATILE flag from chmap ctls

2012-09-06T16:08:33Z

The VOLATILE flag was added to control elements by snd_pcm_add_chmap_ctls() just because I didn't want to have a side-effect of "alsactl restore". But now the set operation doesn't allow to change the value unless the PCM stream is in PREAPRED state, there is no reason to keep this flag. Let's rip it off. Signed-off-by: Takashi Iwai

ALSA: PCM: channel mapping API implementation

2012-09-06T16:01:16Z

This patch implements the basic data types for the standard channel mapping API handling. - The definitions of the channel positions and the new TLV types are added in sound/asound.h and sound/tlv.h, so that they can be referred from user-space. - Introduced a new helper function snd_pcm_add_chmap_ctls() to create control elements representing the channel maps for each PCM (sub)stream. - Some standard pre-defined channel maps are provided for convenience. Signed-off-by: Takashi Iwai

ALSA: pcm: Make constraints lists const

2012-07-05T12:19:39Z

They aren't modified by the core so the drivers can declare them const. Signed-off-by: Mark Brown Signed-off-by: Takashi Iwai

ALSA: core: group read of pointer, tstamp and jiffies

2012-05-22T23:50:29Z

Group read of hw_ptr, tstamp and jiffies in a sequence for better correlation. Previous code took timestamp at the end, which could introduce delays between audio time and system time. Signed-off-by: Pierre-Louis Bossart Signed-off-by: Takashi Iwai

ALSA: pcm - Optimize the call of snd_pcm_update_hw_ptr() in read/write loop

2012-05-11T17:05:12Z

In the PCM read/write loop, the driver calls snd_pcm_update_hw_ptr() at each time at the beginning of the loop. Russell King reported that this hogs CPU significantly. The current code assumes that the pointer callback is very fast and cheap, also not too much fine grained. It's not true in all cases. When the pointer advances short samples while the read/write copy has been performed, the driver updates the hw_ptr and gets avail > 0 again. Then it tries to read/write these small chunks. This repeats until the avail really gets to zero. For avoiding this situation, a simple workaround is to call snd_pcm_update_hw_ptr() only once at starting the loop, assuming that the read/write copy is performed fast enough. If the available count becomes short, it goes to snd_pcm_wait_avail() anyway, and this processes right. Tested-by: Russell King Signed-off-by: Takashi Iwai

ALSA: pcm: Constify the list in snd_pcm_hw_constraint_list

2012-03-15T06:35:17Z

Allows the constraint lists to be declared const by drivers which seems reasonable; there's plenty of other constification we could do if we were being complete but this was easy and quick. Signed-off-by: Mark Brown Signed-off-by: Takashi Iwai

sound: Add export.h for THIS_MODULE/EXPORT_SYMBOL where needed

2011-10-31T23:31:22Z

These aren't modules, but they do make use of these macros, so they will need export.h to get that definition. Previously, they got it via the implicit module.h inclusion. Signed-off-by: Paul Gortmaker

ALSA: pcm: add snd_pcm_hw_rule_noresample()

2011-09-20T06:56:45Z

Add a helper function to allow drivers to disable hardware resampling when the application has specified the SNDRV_PCM_HW_PARAMS_NORESAMPLE flag. Signed-off-by: Clemens Ladisch Signed-off-by: Takashi Iwai