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

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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
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26
src/seq/seq.c
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@ -1521,6 +1521,32 @@ int snd_seq_client_info_get_error_bounce(const snd_seq_client_info_t *info)
return (info->filter & SNDRV_SEQ_FILTER_BOUNCE) ? 1 : 0;
}
/**
* \brief Get the sound card number.
* \param info client_info container
* \return card number or -1 if value is not available.
*
* Only available for SND_SEQ_KERNEL_CLIENT clients.
*/
int snd_seq_client_info_get_card(const snd_seq_client_info_t *info)
{
assert(info);
return info->card;
}
/**
* \brief Get the owning PID.
* \param info client_info container
* \return pid or -1 if value is not available.
*
* Only available for SND_SEQ_USER_CLIENT clients.
*/
int snd_seq_client_info_get_pid(const snd_seq_client_info_t *info)
{
assert(info);
return info->pid;
}
/**
* \brief (DEPRECATED) Get the event filter bitmap of a client_info container
* \param info client_info container