mirrors/alsa-lib
1
0
Fork 0
mirror of https://github.com/alsa-project/alsa-lib.git synced 2025-10-29 05:40:25 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

seq: Provide sequencer sound card number / PID via alsa-lib

Browse source 
rawmidi devices expose the card number via IOCTLs, which allows to
find the corresponding device in sysfs.

The sequencer provides no identifing data. Chromium works around this
issue by scanning rawmidi as well as sequencer devices and matching
them by using assumtions, how the kernel register sequencer devices.

This changes adds support for exposing the card number for kernel clients
as well as the PID for user client.

It supports kernels with and without the required support.

Signed-off-by: Martin Koegler <martin.koegler@chello.at>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Martin Koegler 2016-03-03 22:39:37 +01:00 • committed by Takashi Iwai
parent 3adfa1b3eb
commit e0e3ce5f71
4 changed files with 43 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

6
include/sound/asequencer.h
View file

@ -25,7 +25,7 @@
#include <sound/asound.h>
/** version of the sequencer */
#define SNDRV_SEQ_VERSION SNDRV_PROTOCOL_VERSION (1, 0, 1)
#define SNDRV_SEQ_VERSION SNDRV_PROTOCOL_VERSION(1, 0, 2)
/**
* definition of sequencer event types
@ -357,7 +357,9 @@ struct snd_seq_client_info {
unsigned char event_filter[32]; /* event filter bitmap */
int num_ports; /* RO: number of ports */
int event_lost; /* number of lost events */
char reserved[64]; /* for future use */
int card; /* RO: card number[kernel] */
int pid; /* RO: pid[user] */
char reserved[56]; /* for future use */
};