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ALSA: seq: Allow suppressing UMP conversions

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A sequencer client like seq_dummy rather doesn't want to convert UMP
events but receives / sends as is.  Add a new event filter flag to
suppress the automatic UMP conversion and applies accordingly.

Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20230523075358.9672-32-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2023-05-23 09:53:52 +02:00
parent e9e02819a9
commit 329ffe11a0
3 changed files with 19 additions and 8 deletions
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1
include/uapi/sound/asequencer.h
View file

@ -347,6 +347,7 @@ typedef int __bitwise snd_seq_client_type_t;
#define SNDRV_SEQ_FILTER_BROADCAST (1U<<0) /* accept broadcast messages */
#define SNDRV_SEQ_FILTER_MULTICAST (1U<<1) /* accept multicast messages */
#define SNDRV_SEQ_FILTER_BOUNCE (1U<<2) /* accept bounce event in error */
#define SNDRV_SEQ_FILTER_NO_CONVERT (1U<<30) /* don't convert UMP events */
#define SNDRV_SEQ_FILTER_USE_EVENT (1U<<31) /* use event filter */
struct snd_seq_client_info {

18
sound/core/seq/seq_clientmgr.c
View file

@ -671,14 +671,16 @@ static int snd_seq_deliver_single_event(struct snd_seq_client *client,
dest_port->time_real);
#if IS_ENABLED(CONFIG_SND_SEQ_UMP)
if (snd_seq_ev_is_ump(event)) {
result = snd_seq_deliver_from_ump(client, dest, dest_port,
event, atomic, hop);
goto __skip;
} else if (snd_seq_client_is_ump(dest)) {
result = snd_seq_deliver_to_ump(client, dest, dest_port,
event, atomic, hop);
goto __skip;
if (!(dest->filter & SNDRV_SEQ_FILTER_NO_CONVERT)) {
if (snd_seq_ev_is_ump(event)) {
result = snd_seq_deliver_from_ump(client, dest, dest_port,
event, atomic, hop);
goto __skip;
} else if (snd_seq_client_is_ump(dest)) {
result = snd_seq_deliver_to_ump(client, dest, dest_port,
event, atomic, hop);
goto __skip;
}
}
#endif /* CONFIG_SND_SEQ_UMP */

8
sound/core/seq/seq_dummy.c
View file

@ -152,6 +152,7 @@ static int __init
register_client(void)
{
struct snd_seq_dummy_port *rec1, *rec2;
struct snd_seq_client *client;
int i;
if (ports < 1) {
@ -165,6 +166,13 @@ register_client(void)
if (my_client < 0)
return my_client;
/* don't convert events but just pass-through */
client = snd_seq_kernel_client_get(my_client);
if (!client)
return -EINVAL;
client->filter = SNDRV_SEQ_FILTER_NO_CONVERT;
snd_seq_kernel_client_put(client);
/* create ports */
for (i = 0; i < ports; i++) {
rec1 = create_port(i, 0);