mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-27 20:21:24 +00:00
4cd9255f0a
Make sure we always call munmap() with the same size we called mmap() with before. Current v4l2src uses the same structure for VIDIOC_QUERYBUF, VIDIOC_QBUF and v4l2_munmap calls. The problem is that the video buffer size (length) may vary for compressed or emulated bufs. VIDIOC_QBUF will change it if we pass the pointer of a v4l2_buffer. This is why we should avoid using same variable for mmap and video buffers. https://bugzilla.gnome.org/show_bug.cgi?id=671126
100 lines
3.7 KiB
C
100 lines
3.7 KiB
C
/* GStreamer
|
|
*
|
|
* Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
|
|
* 2006 Edgard Lima <edgard.lima@indt.org.br>
|
|
* 2009 Texas Instruments, Inc - http://www.ti.com/
|
|
*
|
|
* gstv4l2bufferpool.h V4L2 buffer pool class
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Library General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#ifndef __GSTV4L2BUFFER_H__
|
|
#define __GSTV4L2BUFFER_H__
|
|
|
|
#include <gst/gst.h>
|
|
#include "v4l2_calls.h"
|
|
|
|
GST_DEBUG_CATEGORY_EXTERN (v4l2buffer_debug);
|
|
|
|
G_BEGIN_DECLS
|
|
|
|
|
|
GType gst_v4l2_buffer_get_type (void);
|
|
#define GST_TYPE_V4L2_BUFFER (gst_v4l2_buffer_get_type())
|
|
#define GST_IS_V4L2_BUFFER(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_V4L2_BUFFER))
|
|
#define GST_V4L2_BUFFER(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_V4L2_BUFFER, GstV4l2Buffer))
|
|
|
|
GType gst_v4l2_buffer_pool_get_type (void);
|
|
#define GST_TYPE_V4L2_BUFFER_POOL (gst_v4l2_buffer_pool_get_type())
|
|
#define GST_IS_V4L2_BUFFER_POOL(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_V4L2_BUFFER_POOL))
|
|
#define GST_V4L2_BUFFER_POOL(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_V4L2_BUFFER_POOL, GstV4l2BufferPool))
|
|
|
|
|
|
|
|
typedef struct _GstV4l2BufferPool GstV4l2BufferPool;
|
|
typedef struct _GstV4l2Buffer GstV4l2Buffer;
|
|
|
|
|
|
struct _GstV4l2BufferPool
|
|
{
|
|
GstMiniObject parent;
|
|
|
|
GstElement *v4l2elem; /* the v4l2 src/sink that owns us.. maybe we should be owned by v4l2object? */
|
|
gboolean requeuebuf; /* if true, unusued buffers are automatically re-QBUF'd */
|
|
enum v4l2_buf_type type; /* V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_BUF_TYPE_VIDEO_OUTPUT */
|
|
|
|
GMutex *lock;
|
|
gboolean running; /* with lock */
|
|
gint num_live_buffers; /* number of buffers not with driver */
|
|
GAsyncQueue* avail_buffers;/* pool of available buffers, not with the driver and which aren't held outside the bufferpool */
|
|
gint video_fd; /* a dup(2) of the v4l2object's video_fd */
|
|
guint buffer_count;
|
|
GstV4l2Buffer **buffers;
|
|
};
|
|
|
|
struct _GstV4l2Buffer {
|
|
GstBuffer buffer;
|
|
|
|
struct v4l2_buffer vbuffer;
|
|
/* warning: the size of mmap buffer and
|
|
* the actual frame-buffer can be different. */
|
|
size_t mmap_length;
|
|
|
|
/* FIXME: have GstV4l2Src* instead, as this has GstV4l2BufferPool* */
|
|
/* FIXME: do we really want to fix this if GstV4l2Buffer/Pool is shared
|
|
* between v4l2src and v4l2sink??
|
|
*/
|
|
GstV4l2BufferPool *pool;
|
|
};
|
|
|
|
void gst_v4l2_buffer_pool_destroy (GstV4l2BufferPool * pool);
|
|
GstV4l2BufferPool *gst_v4l2_buffer_pool_new (GstElement *v4l2elem, gint fd, gint num_buffers, GstCaps * caps, gboolean requeuebuf, enum v4l2_buf_type type);
|
|
|
|
|
|
GstV4l2Buffer *gst_v4l2_buffer_pool_get (GstV4l2BufferPool *pool, gboolean blocking);
|
|
gboolean gst_v4l2_buffer_pool_qbuf (GstV4l2BufferPool *pool, GstV4l2Buffer *buf);
|
|
GstV4l2Buffer *gst_v4l2_buffer_pool_dqbuf (GstV4l2BufferPool *pool);
|
|
|
|
gint gst_v4l2_buffer_pool_available_buffers (GstV4l2BufferPool *pool);
|
|
|
|
|
|
#define GST_V4L2_BUFFER_POOL_LOCK(pool) g_mutex_lock ((pool)->lock)
|
|
#define GST_V4L2_BUFFER_POOL_UNLOCK(pool) g_mutex_unlock ((pool)->lock)
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __GSTV4L2BUFFER_H__ */
|