From cf5f063f5cce1b21f42be67f3433c0c4db897ff6 Mon Sep 17 00:00:00 2001 From: Miguel Gaio Date: Tue, 17 Jul 2018 13:30:24 +0200 Subject: Fixed pcm_start when pcm is linked to other pcm device When pcm device is linked to other pcm device, the start call may be triggered by other pcm device. Handle this condition by checing pcm state before start call. Signed-off-by: Miguel Gaio --- src/pcm.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) (limited to 'src') diff --git a/src/pcm.c b/src/pcm.c index 7ea58bd..f1d733f 100644 --- a/src/pcm.c +++ b/src/pcm.c @@ -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; -- cgit v1.2.3