Alsa library has different version of read and driver interaction functions why?
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I was going through alsa library code, I wanted to know read function that is being used. However I see there are more than one version of read functions.
i.e
.readi = snd_pcm_hw_readi
.readi = snd_pcm_ioplug_readi
.readi = snd_pcm_mmap_readi
.readi = snd_pcm_dshare_readi
.readi = snd_pcm_plugin_readi
I am not sure how does alsa library choose which function to use ?
what params make it choose different API's (like swparams ,hwparams)
linux-kernel alsa libalsa
asked Nov 11 at 13:20
vishwanath patil
116
add a comment |
up vote
0
down vote
favorite
I was going through alsa library code, I wanted to know read function that is being used. However I see there are more than one version of read functions.
i.e
.readi = snd_pcm_hw_readi
.readi = snd_pcm_ioplug_readi
.readi = snd_pcm_mmap_readi
.readi = snd_pcm_dshare_readi
.readi = snd_pcm_plugin_readi
I am not sure how does alsa library choose which function to use ?
what params make it choose different API's (like swparams ,hwparams)
linux-kernel alsa libalsa
asked Nov 11 at 13:20
vishwanath patil
116
Those are from different plugins.
– CL.
Nov 11 at 14:46
alsa.conf is the only file decides what plugins we use ?
– vishwanath patil
Nov 12 at 6:20
You give a device name tosnd_pcm_open(), and that name is looked up in the configuration files.
– CL.
Nov 12 at 7:23
one varitation that I saw was "snd_pcm_plugin_fast_ops" that was decided based on hw_params and requested params. in "snd_pcm_plug_insert_plugins" function
– vishwanath patil
Nov 13 at 3:56
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I was going through alsa library code, I wanted to know read function that is being used. However I see there are more than one version of read functions.
i.e
.readi = snd_pcm_hw_readi
.readi = snd_pcm_ioplug_readi
.readi = snd_pcm_mmap_readi
.readi = snd_pcm_dshare_readi
.readi = snd_pcm_plugin_readi
I am not sure how does alsa library choose which function to use ?
what params make it choose different API's (like swparams ,hwparams)
linux-kernel alsa libalsa
asked Nov 11 at 13:20
vishwanath patil
116
I was going through alsa library code, I wanted to know read function that is being used. However I see there are more than one version of read functions.
i.e
.readi = snd_pcm_hw_readi
.readi = snd_pcm_ioplug_readi
.readi = snd_pcm_mmap_readi
.readi = snd_pcm_dshare_readi
.readi = snd_pcm_plugin_readi
I am not sure how does alsa library choose which function to use ?
what params make it choose different API's (like swparams ,hwparams)
linux-kernel alsa libalsa
linux-kernel alsa libalsa
asked Nov 11 at 13:20
vishwanath patil
116
asked Nov 11 at 13:20
vishwanath patil
116
asked Nov 11 at 13:20
vishwanath patil
116
asked Nov 11 at 13:20
vishwanath patil
116
asked Nov 11 at 13:20
vishwanath patil
116
116
Those are from different plugins.
– CL.
Nov 11 at 14:46
alsa.conf is the only file decides what plugins we use ?
– vishwanath patil
Nov 12 at 6:20
You give a device name tosnd_pcm_open(), and that name is looked up in the configuration files.
– CL.
Nov 12 at 7:23
one varitation that I saw was "snd_pcm_plugin_fast_ops" that was decided based on hw_params and requested params. in "snd_pcm_plug_insert_plugins" function
– vishwanath patil
Nov 13 at 3:56
add a comment |
Those are from different plugins.
– CL.
Nov 11 at 14:46
alsa.conf is the only file decides what plugins we use ?
– vishwanath patil
Nov 12 at 6:20
You give a device name tosnd_pcm_open(), and that name is looked up in the configuration files.
– CL.
Nov 12 at 7:23
one varitation that I saw was "snd_pcm_plugin_fast_ops" that was decided based on hw_params and requested params. in "snd_pcm_plug_insert_plugins" function
– vishwanath patil
Nov 13 at 3:56
Those are from different plugins.
– CL.
Nov 11 at 14:46
Those are from different plugins.
– CL.
Nov 11 at 14:46
alsa.conf is the only file decides what plugins we use ?
– vishwanath patil
Nov 12 at 6:20
alsa.conf is the only file decides what plugins we use ?
– vishwanath patil
Nov 12 at 6:20
You give a device name to
snd_pcm_open(), and that name is looked up in the configuration files.– CL.
Nov 12 at 7:23
You give a device name to
snd_pcm_open(), and that name is looked up in the configuration files.– CL.
Nov 12 at 7:23
one varitation that I saw was "snd_pcm_plugin_fast_ops" that was decided based on hw_params and requested params. in "snd_pcm_plug_insert_plugins" function
– vishwanath patil
Nov 13 at 3:56
one varitation that I saw was "snd_pcm_plugin_fast_ops" that was decided based on hw_params and requested params. in "snd_pcm_plug_insert_plugins" function
– vishwanath patil
Nov 13 at 3:56
add a comment |
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Those are from different plugins.
– CL.
Nov 11 at 14:46
alsa.conf is the only file decides what plugins we use ?
– vishwanath patil
Nov 12 at 6:20
You give a device name to
snd_pcm_open(), and that name is looked up in the configuration files.– CL.
Nov 12 at 7:23
one varitation that I saw was "snd_pcm_plugin_fast_ops" that was decided based on hw_params and requested params. in "snd_pcm_plug_insert_plugins" function
– vishwanath patil
Nov 13 at 3:56