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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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6ba3abb3a5
Original commit message from CVS: Some final fixes for the v4lsrc elements. * remove software sync thread (use GST_ELEMENT_THREAD_SUGGESTED instead) * make all src elements threadsafe * fix num_buffer argument setting in v4l2src (VIDIOC_S_PARM) * re-add bufsize (RO) for v4lmjpegsrc * fix the A/V sync calculation in all elements (spvf=GST_SECOND/fps, not GST_SECOND*fps) * probably some more crap.... With all this, it actually works quite well. The TODO files describes the next steps in order to make a full-featured video recorder based on these elements and GStreamer (bottom). Making a simple recorder should be fairly easy now, btw.
101 lines
2.7 KiB
C
101 lines
2.7 KiB
C
/* G-Streamer BT8x8/V4L frame grabber plugin
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* Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_V4LSRC_H__
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#define __GST_V4LSRC_H__
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#include <gstv4lelement.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#define GST_TYPE_V4LSRC \
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(gst_v4lsrc_get_type())
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#define GST_V4LSRC(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_V4LSRC,GstV4lSrc))
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#define GST_V4LSRC_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_V4LSRC,GstV4lSrcClass))
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#define GST_IS_V4LSRC(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_V4LSRC))
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#define GST_IS_V4LSRC_CLASS(obj) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_V4LSRC))
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typedef struct _GstV4lSrc GstV4lSrc;
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typedef struct _GstV4lSrcClass GstV4lSrcClass;
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struct _GstV4lSrc {
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GstV4lElement v4lelement;
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/* pads */
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GstPad *srcpad;
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/* bufferpool for the buffers we're gonna use */
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GstBufferPool *bufferpool;
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/* capture/buffer info */
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struct video_mmap mmap;
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struct video_mbuf mbuf;
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guint buffer_size;
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GstClockTime timestamp_sync;
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/* num of queued frames and some GThread stuff
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* to wait if there's not enough */
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gint8 *frame_queue_state;
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GMutex *mutex_queue_state;
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GCond *cond_queue_state;
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gint num_queued;
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gint sync_frame, queue_frame;
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/* True if we want to stop */
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gboolean quit;
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/* A/V sync... frame counter and internal cache */
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gulong handled;
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gint last_frame;
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gint need_writes;
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/* clock */
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GstClock *clock;
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/* time to substract from clock time to get back to timestamp */
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GstClockTime substract_time;
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/* how often are we going to use each frame? */
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gint *use_num_times;
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/* how are we going to push buffers? */
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gboolean use_fixed_fps;
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};
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struct _GstV4lSrcClass {
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GstV4lElementClass parent_class;
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void (*frame_capture) (GObject *object);
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void (*frame_drop) (GObject *object);
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void (*frame_insert) (GObject *object);
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};
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GType gst_v4lsrc_get_type(void);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __GST_V4LSRC_H__ */
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