mirrors/alsa-lib
1
0
Fork 0
mirror of https://github.com/alsa-project/alsa-lib.git synced 2025-11-06 13:29:59 -05:00
Code Issues Projects Releases Packages Wiki Activity Actions

Add snd_pcm_hw_params_get/set_export_buffer()

Browse source 
Add snd_pcm_hw_params_get/set_export_buffer() API functions.
They control to ensure the buffer export to other processes.
If this flag is set, the local buffer of a plugin is exported over IPC shm.
Otherwise the buffer can be handled only locally (no shm).

Also fixed Version file for 1.0.9.
This commit is contained in:
Takashi Iwai 2005-05-19 16:59:04 +00:00
parent 18053076e2
commit 4d7c53d280
7 changed files with 65 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

26
src/pcm/pcm_mmap.c
View file

@ -285,9 +285,12 @@ int snd_pcm_channel_info_shm(snd_pcm_t *pcm, snd_pcm_channel_info_t *info, int s
return -EINVAL;
}
info->addr = 0;
info->type = SND_PCM_AREA_SHM;
info->u.shm.shmid = shmid;
info->u.shm.area = NULL;
if (pcm->hw_flags & SND_PCM_HW_PARAMS_EXPORT_BUFFER) {
info->type = SND_PCM_AREA_SHM;
info->u.shm.shmid = shmid;
info->u.shm.area = NULL;
} else
info->type = SND_PCM_AREA_LOCAL;
return 0;
}
@ -347,6 +350,8 @@ int snd_pcm_mmap(snd_pcm_t *pcm)
if (i1->u.shm.shmid != i->u.shm.shmid)
continue;
break;
case SND_PCM_AREA_LOCAL:
break;
default:
assert(0);
}
@ -368,6 +373,7 @@ int snd_pcm_mmap(snd_pcm_t *pcm)
case SND_PCM_AREA_SHM:
if (i->u.shm.shmid < 0) {
int id;
/* FIXME: safer permission? */
id = shmget(IPC_PRIVATE, size, 0666);
if (id < 0) {
SYSERR("shmget failed");
@ -409,6 +415,14 @@ int snd_pcm_mmap(snd_pcm_t *pcm)
}
i->addr = ptr;
break;
case SND_PCM_AREA_LOCAL:
ptr = malloc(size);
if (ptr == NULL) {
SYSERR("malloc failed");
return -errno;
}
i->addr = ptr;
break;
default:
assert(0);
}
@ -427,6 +441,8 @@ int snd_pcm_mmap(snd_pcm_t *pcm)
if (i1->u.shm.shmid != i->u.shm.shmid)
continue;
break;
case SND_PCM_AREA_LOCAL:
break;
default:
assert(0);
}
@ -494,6 +510,10 @@ int snd_pcm_munmap(snd_pcm_t *pcm)
}
}
break;
case SND_PCM_AREA_LOCAL:
free(i->addr);
i->addr = NULL;
break;
default:
assert(0);
}