diff options
| author | Jussi Laako <jussi@sonarnerd.net> | 2019-02-18 00:17:21 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2019-02-18 09:36:09 +0100 |
| commit | c7a13264918b9796f80c634f20fea56e1612572d (patch) | |
| tree | d0d8757c02033712f513904f827962e0b0c3fded /sound/usb | |
| parent | a06702ca023feccb7c1a5171987f5cac959427ed (diff) | |
ALSA: usb-audio: Expose sample resolution through proc interface
At least some USB devices use (MSB-aligned) audio format larger
than the actual resolution of the device. In order to expose the
actual device resolution (bBitResolution), add extra field to the
procfs stream info interface.
Signed-off-by: Jussi Laako <jussi@sonarnerd.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb')
| -rw-r--r-- | sound/usb/card.h | 1 | ||||
| -rw-r--r-- | sound/usb/format.c | 2 | ||||
| -rw-r--r-- | sound/usb/proc.c | 1 |
3 files changed, 4 insertions, 0 deletions
diff --git a/sound/usb/card.h b/sound/usb/card.h index ac785d15ced4..79fa2a19fb7b 100644 --- a/sound/usb/card.h +++ b/sound/usb/card.h @@ -14,6 +14,7 @@ struct audioformat { u64 formats; /* ALSA format bits */ unsigned int channels; /* # channels */ unsigned int fmt_type; /* USB audio format type (1-3) */ + unsigned int fmt_bits; /* number of significant bits */ unsigned int frame_size; /* samples per frame for non-audio */ int iface; /* interface number */ unsigned char altsetting; /* corresponding alternate setting */ diff --git a/sound/usb/format.c b/sound/usb/format.c index fd13ac11b136..3ee7d6f853b7 100644 --- a/sound/usb/format.c +++ b/sound/usb/format.c @@ -87,6 +87,8 @@ static u64 parse_audio_format_i_type(struct snd_usb_audio *chip, } } + fp->fmt_bits = sample_width; + if ((pcm_formats == 0) && (format == 0 || format == (1 << UAC_FORMAT_TYPE_I_UNDEFINED))) { /* some devices don't define this correctly... */ diff --git a/sound/usb/proc.c b/sound/usb/proc.c index e80c9d0749c9..ef9190530fd2 100644 --- a/sound/usb/proc.c +++ b/sound/usb/proc.c @@ -109,6 +109,7 @@ static void proc_dump_substream_formats(struct snd_usb_substream *subs, struct s if (subs->speed != USB_SPEED_FULL) snd_iprintf(buffer, " Data packet interval: %d us\n", 125 * (1 << fp->datainterval)); + snd_iprintf(buffer, " Bits: %d\n", fp->fmt_bits); // snd_iprintf(buffer, " Max Packet Size = %d\n", fp->maxpacksize); // snd_iprintf(buffer, " EP Attribute = %#x\n", fp->attributes); } |