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Fixed pcm_start when pcm is linked to other pcm device

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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 <mgaio35@gmail.com>
This commit is contained in:
Miguel Gaio
2018-07-17 13:30:24 +02:00
parent f3a4695ef9
commit 7d2a054b08
1 changed files with 7 additions and 4 deletions
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src/pcm.c
+7 -4
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@@ -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;