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v4l2bufferpool: Re-enqueue buffer at stream start

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This commit is contained in:
Nicolas Dufresne 2014-04-29 16:49:52 -04:00
parent a946a7cde6
commit cb311d57f5
1 changed files with 29 additions and 0 deletions
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29
sys/v4l2/gstv4l2bufferpool.c
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@ -602,10 +602,34 @@ start_streaming (GstV4l2BufferPool * pool)
case GST_V4L2_IO_USERPTR: case GST_V4L2_IO_USERPTR:
case GST_V4L2_IO_DMABUF: case GST_V4L2_IO_DMABUF:
case GST_V4L2_IO_DMABUF_IMPORT: case GST_V4L2_IO_DMABUF_IMPORT:
{
/* For capture device, we need to re-enqueue buffers before be can let
* the driver stream again */
if (!V4L2_TYPE_IS_OUTPUT (obj->type)) {
GstBufferPool *bpool = GST_BUFFER_POOL (pool);
GstBufferPoolAcquireParams params = { 0 };
GstFlowReturn ret;
while (pool->num_queued < pool->num_allocated) {
GstBuffer *buf;
params.flags = GST_BUFFER_POOL_ACQUIRE_FLAG_DONTWAIT;
ret = GST_BUFFER_POOL_CLASS (parent_class)->acquire_buffer (bpool,
&buf, &params);
if (ret != GST_FLOW_OK)
goto requeue_failed;
gst_v4l2_buffer_pool_release_buffer (bpool, buf);
}
}
GST_DEBUG_OBJECT (pool, "STREAMON"); GST_DEBUG_OBJECT (pool, "STREAMON");
if (v4l2_ioctl (pool->video_fd, VIDIOC_STREAMON, &obj->type) < 0) if (v4l2_ioctl (pool->video_fd, VIDIOC_STREAMON, &obj->type) < 0)
goto start_failed; goto start_failed;
break; break;
}
default: default:
g_assert_not_reached (); g_assert_not_reached ();
break; break;
@ -622,6 +646,11 @@ start_failed:
g_strerror (errno)); g_strerror (errno));
return FALSE; return FALSE;
} }
requeue_failed:
{
GST_ERROR_OBJECT (pool, "failed to re-enqueue buffers");
return FALSE;
}
} }
static void static void