1 /* GStreamer

     2  *

     3  * gstv4lmjpegsrc.h: hardware MJPEG video source element

     4  *

     5  * Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>

     6  *

     7  * This library is free software; you can redistribute it and/or

     8  * modify it under the terms of the GNU Library General Public

     9  * License as published by the Free Software Foundation; either

    10  * version 2 of the License, or (at your option) any later version.

    11  *

    12  * This library is distributed in the hope that it will be useful,

    13  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    15  * Library General Public License for more details.

    16  *

    17  * You should have received a copy of the GNU Library General Public

    18  * License along with this library; if not, write to the

    19  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,

    20  * Boston, MA 02111-1307, USA.

    21  */

    22 

    23 #ifndef __GST_V4LMJPEGSRC_H__

    24 #define __GST_V4LMJPEGSRC_H__

    25 

    26 #include <gstv4lelement.h>

    27 #include <sys/time.h>

    28 #include <videodev_mjpeg.h>

    29 

    30 G_BEGIN_DECLS

    31 

    32 #define GST_TYPE_V4LMJPEGSRC \

    33   (gst_v4lmjpegsrc_get_type())

    34 #define GST_V4LMJPEGSRC(obj) \

    35   (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_V4LMJPEGSRC,GstV4lMjpegSrc))

    36 #define GST_V4LMJPEGSRC_CLASS(klass) \

    37   (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_V4LMJPEGSRC,GstV4lMjpegSrcClass))

    38 #define GST_IS_V4LMJPEGSRC(obj) \

    39   (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_V4LMJPEGSRC))

    40 #define GST_IS_V4LMJPEGSRC_CLASS(klass) \

    41   (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_V4LMJPEGSRC))

    42 

    43 typedef struct _GstV4lMjpegSrc GstV4lMjpegSrc;

    44 typedef struct _GstV4lMjpegSrcClass GstV4lMjpegSrcClass;

    45 

    46 struct _GstV4lMjpegSrc {

    47   GstV4lElement v4lelement;

    48 

    49   /* pads */

    50   GstPad *srcpad;

    51 

    52   /* buffer/capture info */

    53   struct mjpeg_sync bsync;

    54   struct mjpeg_requestbuffers breq;

    55 

    56   /* num of queued frames and some GThread stuff

    57    * to wait if there's not enough */

    58   gint8 *frame_queue_state;

    59   GMutex *mutex_queue_state;

    60   GCond *cond_queue_state;

    61   gint num_queued;

    62   gint queue_frame;

    63 

    64   /* True if we want to stop */

    65   gboolean quit, is_capturing;

    66 

    67   /* A/V sync... frame counter and internal cache */

    68   gulong handled;

    69   gint last_frame;

    70   gint last_size;

    71   gint need_writes;

    72   gulong last_seq;

    73 

    74   /* clock */

    75   GstClock *clock;

    76 

    77   /* time to substract from clock time to get back to timestamp */

    78   GstClockTime substract_time;

    79 

    80   /* how often are we going to use each frame? */

    81   gint *use_num_times;

    82 

    83   /* how are we going to push buffers? */

    84   gboolean use_fixed_fps;

    85 

    86   /* end size */

    87   gint end_width, end_height;

    88 

    89   /* caching values */

    90 #if 0

    91   gint x_offset;

    92   gint y_offset;

    93   gint frame_width;

    94   gint frame_height;

    95 #endif

    96 

    97   gint quality;

    98   gint numbufs;

    99 };

   100 

   101 struct _GstV4lMjpegSrcClass {

   102   GstV4lElementClass parent_class;

   103 

   104   void (*frame_capture) (GObject *object);

   105   void (*frame_drop)    (GObject *object);

   106   void (*frame_insert)  (GObject *object);

   107   void (*frame_lost)    (GObject *object,

   108                          gint     num_lost);

   109 };

   110 

   111 GType gst_v4lmjpegsrc_get_type(void);

   112 

   113 

   114 G_END_DECLS

   115 

   116 #endif /* __GST_V4LMJPEGSRC_H__ */