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authorHans Verkuil <hans.verkuil@cisco.com>2014-04-14 07:33:00 -0300
committerMauro Carvalho Chehab <m.chehab@samsung.com>2014-04-16 18:57:25 -0300
commit3415a89f48dce655ae353bc70a8e292764e8e931 (patch)
tree5e14b498a4f12817dce2ca2666aa05477ad0f755 /include/media/videobuf2-core.h
parent5f26f2501b81190b60a0b72d611668fb6a59dd24 (diff)
[media] vb2: add thread support
In order to implement vb2 DVB support you need to be able to start a kernel thread that queues and dequeues buffers, calling a callback function for every buffer. This patch adds support for that. It's based on drivers/media/v4l2-core/videobuf-dvb.c, but with all the DVB specific stuff stripped out, thus making it much more generic. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'include/media/videobuf2-core.h')
-rw-r--r--include/media/videobuf2-core.h32
1 files changed, 32 insertions, 0 deletions
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index b1859f6953b2..46e76096c22a 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -20,6 +20,7 @@
struct vb2_alloc_ctx;
struct vb2_fileio_data;
+struct vb2_threadio_data;
/**
* struct vb2_mem_ops - memory handling/memory allocator operations
@@ -375,6 +376,7 @@ struct v4l2_fh;
* @start_streaming_called: start_streaming() was called successfully and we
* started streaming.
* @fileio: file io emulator internal data, used only if emulator is active
+ * @threadio: thread io internal data, used only if thread is active
*/
struct vb2_queue {
enum v4l2_buf_type type;
@@ -411,6 +413,7 @@ struct vb2_queue {
unsigned int start_streaming_called:1;
struct vb2_fileio_data *fileio;
+ struct vb2_threadio_data *threadio;
#ifdef CONFIG_VIDEO_ADV_DEBUG
/*
@@ -461,6 +464,35 @@ size_t vb2_read(struct vb2_queue *q, char __user *data, size_t count,
loff_t *ppos, int nonblock);
size_t vb2_write(struct vb2_queue *q, const char __user *data, size_t count,
loff_t *ppos, int nonblock);
+/**
+ * vb2_thread_fnc - callback function for use with vb2_thread
+ *
+ * This is called whenever a buffer is dequeued in the thread.
+ */
+typedef int (*vb2_thread_fnc)(struct vb2_buffer *vb, void *priv);
+
+/**
+ * vb2_thread_start() - start a thread for the given queue.
+ * @q: videobuf queue
+ * @fnc: callback function
+ * @priv: priv pointer passed to the callback function
+ * @thread_name:the name of the thread. This will be prefixed with "vb2-".
+ *
+ * This starts a thread that will queue and dequeue until an error occurs
+ * or @vb2_thread_stop is called.
+ *
+ * This function should not be used for anything else but the videobuf2-dvb
+ * support. If you think you have another good use-case for this, then please
+ * contact the linux-media mailinglist first.
+ */
+int vb2_thread_start(struct vb2_queue *q, vb2_thread_fnc fnc, void *priv,
+ const char *thread_name);
+
+/**
+ * vb2_thread_stop() - stop the thread for the given queue.
+ * @q: videobuf queue
+ */
+int vb2_thread_stop(struct vb2_queue *q);
/**
* vb2_is_streaming() - return streaming status of the queue

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