GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
GstV4l2Object *obj = pool->obj;
GstCaps *caps;
- guint size, min_buffers, max_buffers;
+ guint size, min_buffers, max_buffers, num_buffers, copy_threshold;
GstAllocator *allocator;
GstAllocationParams params;
+ struct v4l2_requestbuffers breq;
GST_DEBUG_OBJECT (pool, "set config");
GST_DEBUG_OBJECT (pool, "config %" GST_PTR_FORMAT, config);
+ switch (obj->mode) {
+ case GST_V4L2_IO_RW:
+ /* we preallocate 1 buffer, this value also instructs the latency
+ * calculation to have 1 frame latency max */
+ num_buffers = 1;
+ copy_threshold = 0;
+ break;
+ case GST_V4L2_IO_MMAP:
+ {
+ /* request a reasonable number of buffers when no max specified. We will
+ * copy when we run out of buffers */
+ if (max_buffers == 0)
+ num_buffers = 4;
+ else
+ num_buffers = max_buffers;
+
+ /* first, lets request buffers, and see how many we can get: */
+ GST_DEBUG_OBJECT (pool, "starting, requesting %d MMAP buffers",
+ num_buffers);
+
+ memset (&breq, 0, sizeof (struct v4l2_requestbuffers));
+ breq.type = obj->type;
+ breq.count = num_buffers;
+ breq.memory = V4L2_MEMORY_MMAP;
+
+ if (v4l2_ioctl (pool->video_fd, VIDIOC_REQBUFS, &breq) < 0)
+ goto reqbufs_failed;
+
+ GST_LOG_OBJECT (pool, " count: %u", breq.count);
+ GST_LOG_OBJECT (pool, " type: %d", breq.type);
+ GST_LOG_OBJECT (pool, " memory: %d", breq.memory);
+
+ if (breq.count < GST_V4L2_MIN_BUFFERS)
+ goto no_buffers;
+
+ if (num_buffers != breq.count) {
+ GST_WARNING_OBJECT (pool, "using %u buffers instead", breq.count);
+ num_buffers = breq.count;
+ }
+ /* update min buffers with the amount of buffers we just reserved. We need
+ * to configure this value in the bufferpool so that the default start
+ * implementation calls our allocate function */
+ min_buffers = breq.count;
+
+ if (max_buffers == 0 || num_buffers < max_buffers) {
+ /* if we are asked to provide more buffers than we have allocated, start
+ * copying buffers when we only have 2 buffers left in the pool */
+ copy_threshold = 2;
+ } else {
+ /* we are certain that we have enough buffers so we don't need to
+ * copy */
+ copy_threshold = 0;
+ }
+ break;
+ }
+ case GST_V4L2_IO_USERPTR:
+ default:
+ num_buffers = 0;
+ copy_threshold = 0;
+ g_assert_not_reached ();
+ break;
+ }
+
pool->size = size;
- pool->max_buffers = max_buffers;
+ pool->num_buffers = num_buffers;
+ pool->copy_threshold = copy_threshold;
+ if (pool->allocator)
+ gst_allocator_unref (pool->allocator);
+ if ((pool->allocator = allocator))
+ gst_allocator_ref (allocator);
pool->params = params;
gst_buffer_pool_config_set_params (config, caps, size, min_buffers,
GST_ERROR_OBJECT (pool, "invalid config %" GST_PTR_FORMAT, config);
return FALSE;
}
+reqbufs_failed:
+ {
+ GST_ERROR_OBJECT (pool,
+ "error requesting %d buffers: %s", num_buffers, g_strerror (errno));
+ return FALSE;
+ }
+no_buffers:
+ {
+ GST_ERROR_OBJECT (pool,
+ "we received %d from device '%s', we want at least %d",
+ breq.count, obj->videodev, GST_V4L2_MIN_BUFFERS);
+ return FALSE;
+ }
}
static gboolean
{
GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
GstV4l2Object *obj = pool->obj;
- struct v4l2_requestbuffers breq;
- gint max_buffers;
-
- max_buffers = pool->max_buffers;
-
- switch (obj->mode) {
- case GST_V4L2_IO_RW:
- {
- break;
- }
- case GST_V4L2_IO_MMAP:
- {
- /* first, lets request buffers, and see how many we can get: */
- GST_DEBUG_OBJECT (pool, "starting, requesting %d MMAP buffers",
- max_buffers);
-
- if (max_buffers == 0)
- max_buffers = 4;
-
- memset (&breq, 0, sizeof (struct v4l2_requestbuffers));
- breq.type = obj->type;
- breq.count = max_buffers;
- breq.memory = V4L2_MEMORY_MMAP;
-
- if (v4l2_ioctl (pool->video_fd, VIDIOC_REQBUFS, &breq) < 0)
- goto reqbufs_failed;
-
- GST_LOG_OBJECT (pool, " count: %u", breq.count);
- GST_LOG_OBJECT (pool, " type: %d", breq.type);
- GST_LOG_OBJECT (pool, " memory: %d", breq.memory);
-
- if (breq.count < GST_V4L2_MIN_BUFFERS)
- goto no_buffers;
-
- if (max_buffers != breq.count) {
- GST_WARNING_OBJECT (pool, "using %u buffers instead", breq.count);
- max_buffers = breq.count;
- }
- break;
- }
- case GST_V4L2_IO_USERPTR:
- default:
- g_assert_not_reached ();
- break;
- }
pool->obj = obj;
- pool->max_buffers = max_buffers;
- pool->buffers = g_new0 (GstBuffer *, max_buffers);
+ pool->buffers = g_new0 (GstBuffer *, pool->num_buffers);
pool->num_allocated = 0;
/* now, allocate the buffers: */
return TRUE;
/* ERRORS */
-reqbufs_failed:
- {
- GST_ERROR_OBJECT (pool,
- "error requesting %d buffers: %s", max_buffers, g_strerror (errno));
- return FALSE;
- }
-no_buffers:
- {
- GST_ERROR_OBJECT (pool,
- "we received %d from device '%s', we want at least %d",
- breq.count, obj->videodev, GST_V4L2_MIN_BUFFERS);
- return FALSE;
- }
start_failed:
{
GST_ERROR_OBJECT (pool, "failed to start streaming");
ret = GST_BUFFER_POOL_CLASS (parent_class)->stop (bpool);
/* then free the remaining buffers */
- for (n = 0; n < pool->num_allocated; n++) {
- if (pool->buffers[n])
- gst_v4l2_buffer_pool_free_buffer (bpool, pool->buffers[n]);
+ for (n = 0; n < pool->num_queued; n++) {
+ gst_v4l2_buffer_pool_free_buffer (bpool, pool->buffers[n]);
}
g_free (pool->buffers);
pool->buffers = NULL;
gint index;
meta = GST_V4L2_META_GET (buf);
- g_assert (meta != NULL);
+ if (meta == NULL) {
+ GST_LOG_OBJECT (pool, "unref copied buffer %p", buf);
+ /* no meta, it was a copied buffer that we can unref */
+ gst_buffer_unref (buf);
+ return GST_FLOW_OK;
+ }
index = meta->vbuffer.index;
- GST_LOG_OBJECT (pool, "enqueue buffer %p, index:%d, queued:%d", buf,
- index, pool->num_queued);
+ GST_LOG_OBJECT (pool, "enqueue buffer %p, index:%d, queued:%d, flags:%08x",
+ buf, index, pool->num_queued, meta->vbuffer.flags);
if (pool->buffers[index] != NULL)
goto already_queued;
+ GST_LOG_OBJECT (pool, "doing QBUF");
if (v4l2_ioctl (pool->video_fd, VIDIOC_QBUF, &meta->vbuffer) < 0)
goto queue_failed;
GstBuffer *outbuf;
struct v4l2_buffer vbuffer;
GstV4l2Object *obj = pool->obj;
+ GstClockTime timestamp;
if (obj->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
/* select works for input devices when data is available. According to the
pool->buffers[vbuffer.index] = NULL;
pool->num_queued--;
+ timestamp = GST_TIMEVAL_TO_TIME (vbuffer.timestamp);
+
GST_LOG_OBJECT (pool,
- "dequeued buffer %p seq:%d (ix=%d), used %d, flags %08x, pool-queued=%d, buffer=%p",
- outbuf, vbuffer.sequence, vbuffer.index, vbuffer.bytesused, vbuffer.flags,
- pool->num_queued, outbuf);
+ "dequeued buffer %p seq:%d (ix=%d), used %d, flags %08x, ts %"
+ GST_TIME_FORMAT ", pool-queued=%d, buffer=%p", outbuf, vbuffer.sequence,
+ vbuffer.index, vbuffer.bytesused, vbuffer.flags,
+ GST_TIME_ARGS (timestamp), pool->num_queued, outbuf);
/* set top/bottom field first if v4l2_buffer has the information */
if (vbuffer.field == V4L2_FIELD_INTERLACED_TB) {
else
gst_buffer_resize (outbuf, 0, vbuffer.length);
+ GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
+
*buffer = outbuf;
return GST_FLOW_OK;
* storage for our buffers. This function does poll first so we can
* interrupt it fine. */
ret = gst_v4l2_buffer_pool_dqbuf (pool, buffer);
+ if (G_UNLIKELY (ret != GST_FLOW_OK))
+ goto done;
+
+ /* start copying buffers when we are running low on buffers */
+ if (pool->num_queued < pool->copy_threshold) {
+ GstBuffer *copy;
+
+ /* copy the memory */
+ copy = gst_buffer_copy (*buffer);
+ GST_LOG_OBJECT (pool, "copy buffer %p->%p", *buffer, copy);
+
+ /* and requeue so that we can continue capturing */
+ ret = gst_v4l2_buffer_pool_qbuf (pool, *buffer);
+ *buffer = copy;
+ }
break;
case GST_V4L2_IO_USERPTR:
g_assert_not_reached ();
break;
}
+done:
return ret;
/* ERRORS */
if (pool->video_fd >= 0)
v4l2_close (pool->video_fd);
-
+ if (pool->allocator)
+ gst_allocator_unref (pool->allocator);
g_free (pool->buffers);
G_OBJECT_CLASS (parent_class)->finalize (object);
projects / platform / upstream / gst-plugins-good.git / blobdiff