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| author | Takashi Iwai <tiwai@suse.de> | 2012-11-26 15:24:02 (GMT) |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2012-11-26 15:24:02 (GMT) |
| commit | 04324ccc75f96b3ed7aad1c866d1b7925e977bdf (patch) | |
| tree | 8ac8f049686de15f2241ea991f03a79d663dc65e /sound/usb/card.h | |
| parent | 7cc17a31ff5ca3d8e1719af88907beec7b1fd24e (diff) | |
| download | linux-04324ccc75f96b3ed7aad1c866d1b7925e977bdf.tar.xz | |
ALSA: usb-audio: add channel map support
Add the support for channel maps of the PCM streams on USB audio
devices. The channel map information is already found in
ChannelConfig descriptor entries, which haven't been referred until
now.
Each chmap entry is added to audioformat list entry and copied to TLV
dynamically instead of creating a whole chmap array.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb/card.h')
| -rw-r--r-- | sound/usb/card.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sound/usb/card.h b/sound/usb/card.h index 814cb35..8a751b4 100644 --- a/sound/usb/card.h +++ b/sound/usb/card.h @@ -27,6 +27,7 @@ struct audioformat { unsigned int nr_rates; /* number of rate table entries */ unsigned int *rate_table; /* rate table */ unsigned char clock; /* associated clock */ + struct snd_pcm_chmap_elem *chmap; /* (optional) channel map */ }; struct snd_usb_substream; @@ -109,6 +110,7 @@ struct snd_usb_substream { struct audioformat *cur_audiofmt; /* current audioformat pointer (for hw_params callback) */ snd_pcm_format_t pcm_format; /* current audio format (for hw_params callback) */ unsigned int channels; /* current number of channels (for hw_params callback) */ + unsigned int channels_max; /* max channels in the all audiofmts */ unsigned int cur_rate; /* current rate (for hw_params callback) */ unsigned int period_bytes; /* current period bytes (for hw_params callback) */ unsigned int altset_idx; /* USB data format: index of alternate setting */ |