sys/v4l2/gstv4l2object.h

   1 /* GStreamer
   2  *
   3  * Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
   4  *               2006 Edgard Lima <edgard.lima@indt.org.br>
   5  *
   6  * gstv4l2object.h: base class for V4L2 elements
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Library General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Library General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Library General Public
  19  * License along with this library; if not, write to the
  20  * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
  21  * Boston, MA 02110-1301, USA.
  22  */
  23
  24 #ifndef __GST_V4L2_OBJECT_H__
  25 #define __GST_V4L2_OBJECT_H__
  26
  27 #include "ext/videodev2.h"
  28
  29 #include <gst/gst.h>
  30 #include <gst/base/gstpushsrc.h>
  31
  32 #include <gst/video/video.h>
  33
  34 typedef struct _GstV4l2Object GstV4l2Object;
  35 typedef struct _GstV4l2ObjectClassHelper GstV4l2ObjectClassHelper;
  36 typedef struct _GstV4l2Xv GstV4l2Xv;
  37
  38 #include <gstv4l2bufferpool.h>
  39
  40 /* size of v4l2 buffer pool in streaming case */
  41 #define GST_V4L2_MIN_BUFFERS 2
  42
  43 /* max frame width/height */
  44 #define GST_V4L2_MAX_SIZE (1<<15) /* 2^15 == 32768 */
  45
  46 G_BEGIN_DECLS
  47
  48 #define GST_TYPE_V4L2_IO_MODE (gst_v4l2_io_mode_get_type ())
  49 GType gst_v4l2_io_mode_get_type (void);
  50
  51 #define GST_V4L2_OBJECT(obj) (GstV4l2Object *)(obj)
  52
  53 typedef enum {
  54   GST_V4L2_IO_AUTO          = 0,
  55   GST_V4L2_IO_RW            = 1,
  56   GST_V4L2_IO_MMAP          = 2,
  57   GST_V4L2_IO_USERPTR       = 3,
  58   GST_V4L2_IO_DMABUF        = 4,
  59   GST_V4L2_IO_DMABUF_IMPORT = 5
  60 } GstV4l2IOMode;
  61
  62 typedef gboolean  (*GstV4l2GetInOutFunction)  (GstV4l2Object * v4l2object, gint * input);
  63 typedef gboolean  (*GstV4l2SetInOutFunction)  (GstV4l2Object * v4l2object, gint input);
  64 typedef gboolean  (*GstV4l2UpdateFpsFunction) (GstV4l2Object * v4l2object);
  65
  66 #define GST_V4L2_WIDTH(o)        (GST_VIDEO_INFO_WIDTH (&(o)->info))
  67 #define GST_V4L2_HEIGHT(o)       (GST_VIDEO_INFO_HEIGHT (&(o)->info))
  68 #define GST_V4L2_PIXELFORMAT(o)  ((o)->fmtdesc->pixelformat)
  69 #define GST_V4L2_FPS_N(o)        (GST_VIDEO_INFO_FPS_N (&(o)->info))
  70 #define GST_V4L2_FPS_D(o)        (GST_VIDEO_INFO_FPS_D (&(o)->info))
  71
  72 /* simple check whether the device is open */
  73 #define GST_V4L2_IS_OPEN(o)      ((o)->video_fd > 0)
  74
  75 /* check whether the device is 'active' */
  76 #define GST_V4L2_IS_ACTIVE(o)    ((o)->active)
  77 #define GST_V4L2_SET_ACTIVE(o)   ((o)->active = TRUE)
  78 #define GST_V4L2_SET_INACTIVE(o) ((o)->active = FALSE)
  79
  80 struct _GstV4l2Object {
  81   GstElement * element;
  82
  83   enum v4l2_buf_type type;   /* V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_BUF_TYPE_VIDEO_OUTPUT */
  84
  85   /* the video device */
  86   char *videodev;
  87
  88   /* the video-device's file descriptor */
  89   gint video_fd;
  90   GstV4l2IOMode mode;
  91   GstPoll * poll;
  92   gboolean can_poll_device;
  93
  94   gboolean active;
  95   gboolean streaming;
  96
  97   /* the current format */
  98   struct v4l2_fmtdesc *fmtdesc;
  99   struct v4l2_format format;
 100   GstVideoInfo info;
 101   GstVideoAlignment align;
 102
 103   /* Features */
 104   gboolean need_video_meta;
 105   gboolean has_alpha_component;
 106
 107   /* only used if the device supports MPLANE
 108    * nb planes is meaning of v4l2 planes
 109    * the gstreamer equivalent is gst_buffer_n_memory
 110    */
 111   gint n_v4l2_planes;
 112
 113   /* We cache the frame duration if known */
 114   GstClockTime duration;
 115
 116   /* if the MPLANE device support both contiguous and non contiguous
 117    * it allows to select which one we want. But we prefered_non_contiguous
 118    * non contiguous mode.
 119    */
 120   gboolean prefered_non_contiguous;
 121
 122   /* This will be set if supported in decide_allocation. It can be used to
 123    * calculate the minimum latency of a m2m decoder. */
 124   guint32 min_buffers_for_capture;
 125
 126   /* wanted mode */
 127   GstV4l2IOMode req_mode;
 128
 129   /* optional pool */
 130   GstBufferPool *pool;
 131
 132   /* the video device's capabilities */
 133   struct v4l2_capability vcap;
 134
 135   /* the video device's window properties */
 136   struct v4l2_window vwin;
 137
 138   /* some more info about the current input's capabilities */
 139   struct v4l2_input vinput;
 140
 141   /* lists... */
 142   GSList *formats;              /* list of available capture formats */
 143   GstCaps *probed_caps;
 144
 145   GList *colors;
 146   GList *norms;
 147   GList *channels;
 148   GData *controls;
 149
 150   /* properties */
 151   v4l2_std_id tv_norm;
 152   gchar *channel;
 153   gulong frequency;
 154   GstStructure *extra_controls;
 155   gboolean keep_aspect;
 156   GValue *par;
 157
 158   /* X-overlay */
 159   GstV4l2Xv *xv;
 160   gulong xwindow_id;
 161
 162   /* funcs */
 163   GstV4l2GetInOutFunction  get_in_out_func;
 164   GstV4l2SetInOutFunction  set_in_out_func;
 165   GstV4l2UpdateFpsFunction update_fps_func;
 166
 167   /* Quirks */
 168   /* Skips interlacing probes */
 169   gboolean never_interlaced;
 170   /* Allow to skip reading initial format through G_FMT. Some devices
 171    * just fails if you don't call S_FMT first. (ex: M2M decoders) */
 172   gboolean no_initial_format;
 173 };
 174
 175 struct _GstV4l2ObjectClassHelper {
 176   /* probed devices */
 177   GList *devices;
 178 };
 179
 180 GType gst_v4l2_object_get_type (void);
 181
 182 #define V4L2_STD_OBJECT_PROPS \
 183     PROP_DEVICE,              \
 184     PROP_DEVICE_NAME,         \
 185     PROP_DEVICE_FD,           \
 186     PROP_FLAGS,               \
 187     PROP_BRIGHTNESS,          \
 188     PROP_CONTRAST,            \
 189     PROP_SATURATION,          \
 190     PROP_HUE,                 \
 191     PROP_TV_NORM,             \
 192     PROP_IO_MODE,             \
 193     PROP_OUTPUT_IO_MODE,      \
 194     PROP_CAPTURE_IO_MODE,     \
 195     PROP_EXTRA_CONTROLS,      \
 196     PROP_PIXEL_ASPECT_RATIO,  \
 197     PROP_FORCE_ASPECT_RATIO
 198
 199 /* create/destroy */
 200 GstV4l2Object*  gst_v4l2_object_new       (GstElement * element,
 201                                            enum v4l2_buf_type  type,
 202                                            const char * default_device,
 203                                            GstV4l2GetInOutFunction get_in_out_func,
 204                                            GstV4l2SetInOutFunction set_in_out_func,
 205                                            GstV4l2UpdateFpsFunction update_fps_func);
 206
 207 void            gst_v4l2_object_destroy   (GstV4l2Object * v4l2object);
 208
 209 /* properties */
 210
 211 void         gst_v4l2_object_install_properties_helper (GObjectClass * gobject_class,
 212                                                         const char * default_device);
 213
 214 void         gst_v4l2_object_install_m2m_properties_helper (GObjectClass * gobject_class);
 215
 216 gboolean     gst_v4l2_object_set_property_helper       (GstV4l2Object * v4l2object,
 217                                                         guint prop_id,
 218                                                         const GValue * value,
 219                                                         GParamSpec * pspec);
 220 gboolean     gst_v4l2_object_get_property_helper       (GstV4l2Object *v4l2object,
 221                                                         guint prop_id, GValue * value,
 222                                                         GParamSpec * pspec);
 223 /* open/close */
 224 gboolean     gst_v4l2_object_open            (GstV4l2Object *v4l2object);
 225 gboolean     gst_v4l2_object_open_shared     (GstV4l2Object *v4l2object, GstV4l2Object *other);
 226 gboolean     gst_v4l2_object_close           (GstV4l2Object *v4l2object);
 227
 228 /* probing */
 229 #if 0
 230 const GList* gst_v4l2_probe_get_properties  (GstPropertyProbe * probe);
 231
 232 void         gst_v4l2_probe_probe_property  (GstPropertyProbe * probe, guint prop_id,
 233                                              const GParamSpec * pspec,
 234                                              GList ** klass_devices);
 235 gboolean     gst_v4l2_probe_needs_probe     (GstPropertyProbe * probe, guint prop_id,
 236                                              const GParamSpec * pspec,
 237                                              GList ** klass_devices);
 238 GValueArray* gst_v4l2_probe_get_values      (GstPropertyProbe * probe, guint prop_id,
 239                                              const GParamSpec * pspec,
 240                                              GList ** klass_devices);
 241 #endif
 242
 243 GstCaps*      gst_v4l2_object_get_all_caps (void);
 244
 245 GstCaps*      gst_v4l2_object_get_raw_caps (void);
 246
 247 GstCaps*      gst_v4l2_object_get_codec_caps (void);
 248
 249 gboolean      gst_v4l2_object_set_format  (GstV4l2Object * v4l2object, GstCaps * caps);
 250
 251 gboolean      gst_v4l2_object_caps_equal  (GstV4l2Object * v4l2object, GstCaps * caps);
 252
 253 gboolean      gst_v4l2_object_unlock      (GstV4l2Object * v4l2object);
 254 gboolean      gst_v4l2_object_unlock_stop (GstV4l2Object * v4l2object);
 255
 256 gboolean      gst_v4l2_object_stop        (GstV4l2Object * v4l2object);
 257
 258 GstCaps *     gst_v4l2_object_get_caps    (GstV4l2Object * v4l2object,
 259                                            GstCaps * filter);
 260
 261 gboolean      gst_v4l2_object_acquire_format (GstV4l2Object * v4l2object,
 262                                               GstVideoInfo * info);
 263
 264 gboolean      gst_v4l2_object_set_crop    (GstV4l2Object * obj);
 265
 266 gboolean      gst_v4l2_object_decide_allocation (GstV4l2Object * v4l2object,
 267                                                  GstQuery * query);
 268
 269 gboolean      gst_v4l2_object_propose_allocation (GstV4l2Object * obj,
 270                                                   GstQuery * query);
 271
 272 GstStructure * gst_v4l2_object_v4l2fourcc_to_structure (guint32 fourcc);
 273
 274
 275 #define GST_IMPLEMENT_V4L2_PROBE_METHODS(Type_Class, interface_as_function)                 \
 276                                                                                             \
 277 static void                                                                                 \
 278 interface_as_function ## _probe_probe_property (GstPropertyProbe * probe,                   \
 279                                                 guint prop_id,                              \
 280                                                 const GParamSpec * pspec)                   \
 281 {                                                                                           \
 282   Type_Class *this_class = (Type_Class*) G_OBJECT_GET_CLASS (probe);                        \
 283   gst_v4l2_probe_probe_property (probe, prop_id, pspec,                                     \
 284                                  &this_class->v4l2_class_devices);                          \
 285 }                                                                                           \
 286                                                                                             \
 287 static gboolean                                                                             \
 288 interface_as_function ## _probe_needs_probe (GstPropertyProbe * probe,                      \
 289                                              guint prop_id,                                 \
 290                                              const GParamSpec * pspec)                      \
 291 {                                                                                           \
 292   Type_Class *this_class = (Type_Class*) G_OBJECT_GET_CLASS (probe);                        \
 293   return gst_v4l2_probe_needs_probe (probe, prop_id, pspec,                                 \
 294                                      &this_class->v4l2_class_devices);                      \
 295 }                                                                                           \
 296                                                                                             \
 297 static GValueArray *                                                                        \
 298 interface_as_function ## _probe_get_values (GstPropertyProbe * probe,                       \
 299                                             guint prop_id,                                  \
 300                                             const GParamSpec * pspec)                       \
 301 {                                                                                           \
 302   Type_Class *this_class = (Type_Class*) G_OBJECT_GET_CLASS (probe);                        \
 303   return gst_v4l2_probe_get_values (probe, prop_id, pspec,                                  \
 304                                     &this_class->v4l2_class_devices);                       \
 305 }                                                                                           \
 306                                                                                             \
 307 static void                                                                                 \
 308 interface_as_function ## _property_probe_interface_init (GstPropertyProbeInterface * iface) \
 309 {                                                                                           \
 310   iface->get_properties = gst_v4l2_probe_get_properties;                                    \
 311   iface->probe_property = interface_as_function ## _probe_probe_property;                   \
 312   iface->needs_probe = interface_as_function ## _probe_needs_probe;                         \
 313   iface->get_values = interface_as_function ## _probe_get_values;                           \
 314 }
 315
 316 G_END_DECLS
 317
 318 #endif /* __GST_V4L2_OBJECT_H__ */