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v4l2pool: Fix CREATE_BUFS support for capture

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This patch fixes CREATE_BUFS support for capture devices. Initially we
would only try and allocate more buffers when the copy threshold
is reached. When the threshold was not set (needed) it would never
happen. Another problem is that on capture side, acquire returns
filled buffer, hence need to pool. We need to set a special flag to
force allocation to happen.

https://bugzilla.gnome.org/show_bug.cgi?id=741134
This commit is contained in:
Nicolas Dufresne 2014-12-03 17:07:49 -05:00
parent b80edd2ee2
commit 319efc3e20
1 changed files with 23 additions and 9 deletions
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32
sys/v4l2/gstv4l2bufferpool.c
View file

@ -601,8 +601,8 @@ streamoff_failed:
}
}
static void
gst_v4l2_buffer_pool_group_released (GstV4l2BufferPool * pool)
static GstFlowReturn
gst_v4l2_buffer_pool_resurect_buffer (GstV4l2BufferPool * pool)
{
GstBufferPoolAcquireParams params = { 0 };
GstBuffer *buffer = NULL;
@ -617,6 +617,8 @@ gst_v4l2_buffer_pool_group_released (GstV4l2BufferPool * pool)
if (ret == GST_FLOW_OK)
gst_buffer_unref (buffer);
return ret;
}
static gboolean
@ -758,7 +760,7 @@ gst_v4l2_buffer_pool_start (GstBufferPool * bpool)
if (!V4L2_TYPE_IS_OUTPUT (obj->type))
pool->group_released_handler =
g_signal_connect_swapped (pool->vallocator, "group-released",
G_CALLBACK (gst_v4l2_buffer_pool_group_released), pool);
G_CALLBACK (gst_v4l2_buffer_pool_resurect_buffer), pool);
return TRUE;
@ -1597,6 +1599,8 @@ gst_v4l2_buffer_pool_process (GstV4l2BufferPool * pool, GstBuffer ** buf)
GstBuffer *tmp;
if ((*buf)->pool == bpool) {
guint num_queued;
if (gst_buffer_get_size (*buf) == 0) {
if (GST_BUFFER_FLAG_IS_SET (*buf, GST_BUFFER_FLAG_CORRUPTED))
goto buffer_corrupted;
@ -1604,17 +1608,27 @@ gst_v4l2_buffer_pool_process (GstV4l2BufferPool * pool, GstBuffer ** buf)
goto eos;
}
num_queued = g_atomic_int_get (&pool->num_queued);
GST_TRACE_OBJECT (pool, "Only %i buffer left in the capture queue.",
num_queued);
/* If we have no more buffer, and can allocate it time to do so */
if (num_queued == 0) {
if (GST_V4L2_ALLOCATOR_CAN_ALLOCATE (pool->vallocator, MMAP)) {
ret = gst_v4l2_buffer_pool_resurect_buffer (pool);
if (ret == GST_FLOW_OK)
goto done;
}
}
/* start copying buffers when we are running low on buffers */
if (g_atomic_int_get (&pool->num_queued) < pool->copy_threshold) {
if (num_queued < pool->copy_threshold) {
GstBuffer *copy;
if (GST_V4L2_ALLOCATOR_CAN_ALLOCATE (pool->vallocator, MMAP)) {
if (gst_buffer_pool_acquire_buffer (bpool, &copy,
NULL) == GST_FLOW_OK) {
gst_v4l2_buffer_pool_release_buffer (bpool, copy);
ret = gst_v4l2_buffer_pool_resurect_buffer (pool);
if (ret == GST_FLOW_OK)
goto done;
}
}
/* copy the buffer */