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319 lines
13 KiB
C
319 lines
13 KiB
C
/* GStreamer
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*
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* Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
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* 2006 Edgard Lima <edgard.lima@indt.org.br>
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*
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* gstv4l2object.h: base class for V4L2 elements
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_V4L2_OBJECT_H__
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#define __GST_V4L2_OBJECT_H__
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#include "ext/videodev2.h"
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#include <gst/gst.h>
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#include <gst/base/gstpushsrc.h>
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#include <gst/video/video.h>
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typedef struct _GstV4l2Object GstV4l2Object;
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typedef struct _GstV4l2ObjectClassHelper GstV4l2ObjectClassHelper;
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typedef struct _GstV4l2Xv GstV4l2Xv;
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#include <gstv4l2bufferpool.h>
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/* size of v4l2 buffer pool in streaming case */
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#define GST_V4L2_MIN_BUFFERS 2
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/* max frame width/height */
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#define GST_V4L2_MAX_SIZE (1<<15) /* 2^15 == 32768 */
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G_BEGIN_DECLS
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#define GST_TYPE_V4L2_IO_MODE (gst_v4l2_io_mode_get_type ())
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GType gst_v4l2_io_mode_get_type (void);
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#define GST_V4L2_OBJECT(obj) (GstV4l2Object *)(obj)
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typedef enum {
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GST_V4L2_IO_AUTO = 0,
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GST_V4L2_IO_RW = 1,
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GST_V4L2_IO_MMAP = 2,
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GST_V4L2_IO_USERPTR = 3,
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GST_V4L2_IO_DMABUF = 4,
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GST_V4L2_IO_DMABUF_IMPORT = 5
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} GstV4l2IOMode;
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typedef gboolean (*GstV4l2GetInOutFunction) (GstV4l2Object * v4l2object, gint * input);
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typedef gboolean (*GstV4l2SetInOutFunction) (GstV4l2Object * v4l2object, gint input);
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typedef gboolean (*GstV4l2UpdateFpsFunction) (GstV4l2Object * v4l2object);
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#define GST_V4L2_WIDTH(o) (GST_VIDEO_INFO_WIDTH (&(o)->info))
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#define GST_V4L2_HEIGHT(o) (GST_VIDEO_INFO_HEIGHT (&(o)->info))
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#define GST_V4L2_PIXELFORMAT(o) ((o)->fmtdesc->pixelformat)
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#define GST_V4L2_FPS_N(o) (GST_VIDEO_INFO_FPS_N (&(o)->info))
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#define GST_V4L2_FPS_D(o) (GST_VIDEO_INFO_FPS_D (&(o)->info))
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/* simple check whether the device is open */
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#define GST_V4L2_IS_OPEN(o) ((o)->video_fd > 0)
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/* check whether the device is 'active' */
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#define GST_V4L2_IS_ACTIVE(o) ((o)->active)
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#define GST_V4L2_SET_ACTIVE(o) ((o)->active = TRUE)
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#define GST_V4L2_SET_INACTIVE(o) ((o)->active = FALSE)
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struct _GstV4l2Object {
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GstElement * element;
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enum v4l2_buf_type type; /* V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_BUF_TYPE_VIDEO_OUTPUT */
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/* the video device */
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char *videodev;
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/* the video-device's file descriptor */
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gint video_fd;
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GstV4l2IOMode mode;
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gboolean active;
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gboolean streaming;
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/* the current format */
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struct v4l2_fmtdesc *fmtdesc;
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struct v4l2_format format;
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GstVideoInfo info;
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GstVideoAlignment align;
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/* Features */
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gboolean need_video_meta;
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gboolean has_alpha_component;
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/* only used if the device supports MPLANE
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* nb planes is meaning of v4l2 planes
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* the gstreamer equivalent is gst_buffer_n_memory
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*/
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gint n_v4l2_planes;
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/* We cache the frame duration if known */
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GstClockTime duration;
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/* if the MPLANE device support both contiguous and non contiguous
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* it allows to select which one we want. But we prefered_non_contiguous
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* non contiguous mode.
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*/
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gboolean prefered_non_contiguous;
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/* This will be set if supported in decide_allocation. It can be used to
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* calculate the minimum latency. */
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guint32 min_buffers;
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/* This will be set if supported in propose allocation. */
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guint32 min_buffers_for_output;
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/* wanted mode */
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GstV4l2IOMode req_mode;
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/* optional pool */
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GstBufferPool *pool;
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/* the video device's capabilities */
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struct v4l2_capability vcap;
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/* the video device's window properties */
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struct v4l2_window vwin;
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/* some more info about the current input's capabilities */
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struct v4l2_input vinput;
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/* lists... */
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GSList *formats; /* list of available capture formats */
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GstCaps *probed_caps;
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GList *colors;
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GList *norms;
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GList *channels;
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GData *controls;
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/* properties */
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v4l2_std_id tv_norm;
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gchar *channel;
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gulong frequency;
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GstStructure *extra_controls;
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gboolean keep_aspect;
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GValue *par;
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/* X-overlay */
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GstV4l2Xv *xv;
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gulong xwindow_id;
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/* funcs */
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GstV4l2GetInOutFunction get_in_out_func;
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GstV4l2SetInOutFunction set_in_out_func;
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GstV4l2UpdateFpsFunction update_fps_func;
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/* Quirks */
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/* Skips interlacing probes */
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gboolean never_interlaced;
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/* Allow to skip reading initial format through G_FMT. Some devices
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* just fails if you don't call S_FMT first. (ex: M2M decoders) */
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gboolean no_initial_format;
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};
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struct _GstV4l2ObjectClassHelper {
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/* probed devices */
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GList *devices;
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};
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GType gst_v4l2_object_get_type (void);
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#define V4L2_STD_OBJECT_PROPS \
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PROP_DEVICE, \
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PROP_DEVICE_NAME, \
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PROP_DEVICE_FD, \
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PROP_FLAGS, \
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PROP_BRIGHTNESS, \
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PROP_CONTRAST, \
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PROP_SATURATION, \
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PROP_HUE, \
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PROP_TV_NORM, \
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PROP_IO_MODE, \
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PROP_OUTPUT_IO_MODE, \
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PROP_CAPTURE_IO_MODE, \
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PROP_EXTRA_CONTROLS, \
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PROP_PIXEL_ASPECT_RATIO, \
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PROP_FORCE_ASPECT_RATIO
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/* create/destroy */
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GstV4l2Object* gst_v4l2_object_new (GstElement * element,
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enum v4l2_buf_type type,
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const char * default_device,
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GstV4l2GetInOutFunction get_in_out_func,
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GstV4l2SetInOutFunction set_in_out_func,
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GstV4l2UpdateFpsFunction update_fps_func);
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void gst_v4l2_object_destroy (GstV4l2Object * v4l2object);
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/* properties */
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void gst_v4l2_object_install_properties_helper (GObjectClass * gobject_class,
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const char * default_device);
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void gst_v4l2_object_install_m2m_properties_helper (GObjectClass * gobject_class);
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gboolean gst_v4l2_object_set_property_helper (GstV4l2Object * v4l2object,
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guint prop_id,
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const GValue * value,
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GParamSpec * pspec);
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gboolean gst_v4l2_object_get_property_helper (GstV4l2Object *v4l2object,
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guint prop_id, GValue * value,
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GParamSpec * pspec);
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/* open/close */
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gboolean gst_v4l2_object_open (GstV4l2Object *v4l2object);
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gboolean gst_v4l2_object_open_shared (GstV4l2Object *v4l2object, GstV4l2Object *other);
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gboolean gst_v4l2_object_close (GstV4l2Object *v4l2object);
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/* probing */
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#if 0
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const GList* gst_v4l2_probe_get_properties (GstPropertyProbe * probe);
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void gst_v4l2_probe_probe_property (GstPropertyProbe * probe, guint prop_id,
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const GParamSpec * pspec,
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GList ** klass_devices);
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gboolean gst_v4l2_probe_needs_probe (GstPropertyProbe * probe, guint prop_id,
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const GParamSpec * pspec,
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GList ** klass_devices);
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GValueArray* gst_v4l2_probe_get_values (GstPropertyProbe * probe, guint prop_id,
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const GParamSpec * pspec,
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GList ** klass_devices);
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#endif
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GstCaps* gst_v4l2_object_get_all_caps (void);
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GstCaps* gst_v4l2_object_get_raw_caps (void);
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GstCaps* gst_v4l2_object_get_codec_caps (void);
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gboolean gst_v4l2_object_set_format (GstV4l2Object * v4l2object, GstCaps * caps);
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gboolean gst_v4l2_object_caps_equal (GstV4l2Object * v4l2object, GstCaps * caps);
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gboolean gst_v4l2_object_unlock (GstV4l2Object * v4l2object);
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gboolean gst_v4l2_object_unlock_stop (GstV4l2Object * v4l2object);
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gboolean gst_v4l2_object_stop (GstV4l2Object * v4l2object);
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GstCaps * gst_v4l2_object_get_caps (GstV4l2Object * v4l2object,
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GstCaps * filter);
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gboolean gst_v4l2_object_acquire_format (GstV4l2Object * v4l2object,
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GstVideoInfo * info);
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gboolean gst_v4l2_object_set_crop (GstV4l2Object * obj);
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gboolean gst_v4l2_object_decide_allocation (GstV4l2Object * v4l2object,
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GstQuery * query);
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gboolean gst_v4l2_object_propose_allocation (GstV4l2Object * obj,
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GstQuery * query);
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GstStructure * gst_v4l2_object_v4l2fourcc_to_structure (guint32 fourcc);
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#define GST_IMPLEMENT_V4L2_PROBE_METHODS(Type_Class, interface_as_function) \
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\
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static void \
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interface_as_function ## _probe_probe_property (GstPropertyProbe * probe, \
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guint prop_id, \
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const GParamSpec * pspec) \
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{ \
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Type_Class *this_class = (Type_Class*) G_OBJECT_GET_CLASS (probe); \
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gst_v4l2_probe_probe_property (probe, prop_id, pspec, \
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&this_class->v4l2_class_devices); \
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} \
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\
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static gboolean \
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interface_as_function ## _probe_needs_probe (GstPropertyProbe * probe, \
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guint prop_id, \
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const GParamSpec * pspec) \
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{ \
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Type_Class *this_class = (Type_Class*) G_OBJECT_GET_CLASS (probe); \
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return gst_v4l2_probe_needs_probe (probe, prop_id, pspec, \
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&this_class->v4l2_class_devices); \
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} \
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\
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static GValueArray * \
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interface_as_function ## _probe_get_values (GstPropertyProbe * probe, \
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guint prop_id, \
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const GParamSpec * pspec) \
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{ \
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Type_Class *this_class = (Type_Class*) G_OBJECT_GET_CLASS (probe); \
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return gst_v4l2_probe_get_values (probe, prop_id, pspec, \
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&this_class->v4l2_class_devices); \
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} \
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\
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static void \
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interface_as_function ## _property_probe_interface_init (GstPropertyProbeInterface * iface) \
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{ \
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iface->get_properties = gst_v4l2_probe_get_properties; \
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iface->probe_property = interface_as_function ## _probe_probe_property; \
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iface->needs_probe = interface_as_function ## _probe_needs_probe; \
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iface->get_values = interface_as_function ## _probe_get_values; \
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}
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G_END_DECLS
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#endif /* __GST_V4L2_OBJECT_H__ */
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