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-rw-r--r--src/pcm.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/src/pcm.c b/src/pcm.c
index f665cb4..f1d733f 100644
--- a/src/pcm.c
+++ b/src/pcm.c
@@ -511,7 +511,7 @@ static int pcm_sync_ptr(struct pcm *pcm, int flags)
}
return 0;
}
- return -1;
+ return 0;
}
static int pcm_hw_mmap_status(struct pcm *pcm)
@@ -1203,11 +1203,14 @@ int pcm_start(struct pcm *pcm)
if (prepare_error)
return prepare_error;
- if (pcm->flags & PCM_MMAP)
- pcm_sync_ptr(pcm, 0);
+ /* if pcm is linked, it may be already started by other pcm */
+ /* check pcm state is not in running state */
+ pcm_sync_ptr(pcm, 0);
- if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_START) < 0)
- return oops(pcm, errno, "cannot start channel");
+ if (pcm->mmap_status->state != PCM_STATE_RUNNING) {
+ if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_START) < 0)
+ return oops(pcm, errno, "cannot start channel");
+ }
pcm->running = 1;
return 0;