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cae0b9a2d2
skip_try_fmt_probes quirk is set, V4L2 object will not probe for interlace-mode and colorimetry to avoid relying on try_fmt. This quirk will be used by v4l2src to avoid desastrous startup time with slow USB webcams. When this quirk is enabled, caller will have to iterate over the negotiated caps as it may contains unsupported formats. If the peer didn't choose a specific interlace-mode, or colorimetry, the value chosen by the driver is set into the caps. For this reason, when this mode is enabled, gst_v4l2_object_set_format() will require writable caps. https://bugzilla.gnome.org/show_bug.cgi?id=785156
340 lines
12 KiB
C
340 lines
12 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@gmail.com>
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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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#ifdef HAVE_LIBV4L2
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# include <libv4l2.h>
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#else
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# include "ext/videodev2.h"
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# include <sys/ioctl.h>
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# include <sys/mman.h>
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# include <unistd.h>
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# define v4l2_fd_open(fd, flags) (fd)
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# define v4l2_close close
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# define v4l2_dup dup
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# define v4l2_ioctl ioctl
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# define v4l2_read read
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# define v4l2_mmap mmap
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# define v4l2_munmap munmap
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#endif
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#include "ext/videodev2.h"
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#include "v4l2-utils.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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/* checks whether the current v4lv4l2object has already been open()'ed or not */
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#define GST_V4L2_CHECK_OPEN(v4l2object) \
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if (!GST_V4L2_IS_OPEN(v4l2object)) \
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{ \
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GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS, \
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(_("Device is not open.")), (NULL)); \
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return FALSE; \
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}
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/* checks whether the current v4lv4l2object is close()'ed or whether it is still open */
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#define GST_V4L2_CHECK_NOT_OPEN(v4l2object) \
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if (GST_V4L2_IS_OPEN(v4l2object)) \
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{ \
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GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS, \
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(_("Device is open.")), (NULL)); \
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return FALSE; \
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}
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/* checks whether we're out of capture mode or not */
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#define GST_V4L2_CHECK_NOT_ACTIVE(v4l2object) \
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if (GST_V4L2_IS_ACTIVE(v4l2object)) \
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{ \
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GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS, \
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(NULL), ("Device is in streaming mode")); \
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return FALSE; \
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}
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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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/* opened device specific capabilities */
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guint32 device_caps;
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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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/* Avoid any try_fmt probe. This is used by v4l2src to speedup start up time
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* on slow USB firmwares. When this is set, gst_v4l2_set_format() will modify
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* the caps to reflect what was negotiated during fixation */
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gboolean skip_try_fmt_probes;
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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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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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gint gst_v4l2_object_extrapolate_stride (const GstVideoFormatInfo * finfo,
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gint plane, gint stride);
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gboolean gst_v4l2_object_set_format (GstV4l2Object * v4l2object, GstCaps * caps, GstV4l2Error * error);
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gboolean gst_v4l2_object_try_format (GstV4l2Object * v4l2object, GstCaps * caps, GstV4l2Error * error);
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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_probe_caps (GstV4l2Object * v4l2object, GstCaps * filter);
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GstCaps * gst_v4l2_object_get_caps (GstV4l2Object * v4l2object, GstCaps * filter);
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gboolean gst_v4l2_object_acquire_format (GstV4l2Object * v4l2object, 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, GstQuery * query);
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gboolean gst_v4l2_object_propose_allocation (GstV4l2Object * obj, GstQuery * query);
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GstStructure * gst_v4l2_object_v4l2fourcc_to_structure (guint32 fourcc);
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/* TODO Move to proper namespace */
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/* open/close the device */
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gboolean gst_v4l2_open (GstV4l2Object * v4l2object);
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gboolean gst_v4l2_dup (GstV4l2Object * v4l2object, GstV4l2Object * other);
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gboolean gst_v4l2_close (GstV4l2Object * v4l2object);
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/* norm/input/output */
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gboolean gst_v4l2_get_norm (GstV4l2Object * v4l2object, v4l2_std_id * norm);
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gboolean gst_v4l2_set_norm (GstV4l2Object * v4l2object, v4l2_std_id norm);
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gboolean gst_v4l2_get_input (GstV4l2Object * v4l2object, gint * input);
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gboolean gst_v4l2_set_input (GstV4l2Object * v4l2object, gint input);
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gboolean gst_v4l2_get_output (GstV4l2Object * v4l2object, gint * output);
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gboolean gst_v4l2_set_output (GstV4l2Object * v4l2object, gint output);
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/* frequency control */
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gboolean gst_v4l2_get_frequency (GstV4l2Object * v4l2object, gint tunernum, gulong * frequency);
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gboolean gst_v4l2_set_frequency (GstV4l2Object * v4l2object, gint tunernum, gulong frequency);
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gboolean gst_v4l2_signal_strength (GstV4l2Object * v4l2object, gint tunernum, gulong * signal);
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/* attribute control */
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gboolean gst_v4l2_get_attribute (GstV4l2Object * v4l2object, int attribute, int * value);
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gboolean gst_v4l2_set_attribute (GstV4l2Object * v4l2object, int attribute, const int value);
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gboolean gst_v4l2_set_controls (GstV4l2Object * v4l2object, GstStructure * controls);
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G_END_DECLS
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#endif /* __GST_V4L2_OBJECT_H__ */
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