mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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f19cfbda96
This also does the following changes:
(1) pull the bufferpool code out into gstv4l2bufferpool.c, and make a
bit more generic so it can be used both for v4l2src and v4l2sink
(2) move some of the device probing/configuration/caps stuff into
gstv4l2object.c so it does not have to be duplicated between
v4l2src and v4l2sink
Fixes bug #590280.
181 lines
6.8 KiB
C
181 lines
6.8 KiB
C
/* GStreamer
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*
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* Copyright (C) 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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* v4l2_calls.h - generic V4L2 calls handling
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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 __V4L2_CALLS_H__
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#define __V4L2_CALLS_H__
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#include "gstv4l2object.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 <sys/ioctl.h>
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# include <linux/videodev.h>
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# include <linux/videodev2.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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/* simple check whether the device is open */
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#define GST_V4L2_IS_OPEN(v4l2object) \
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(v4l2object->video_fd > 0)
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/* check whether the device is 'active' */
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#define GST_V4L2_IS_ACTIVE(v4l2object) \
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(v4l2object->buffer != NULL)
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#define GST_V4L2_IS_OVERLAY(v4l2object) \
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(v4l2object->vcap.capabilities & V4L2_CAP_VIDEO_OVERLAY)
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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 the current v4lv4l2object does video overlay */
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#define GST_V4L2_CHECK_OVERLAY(v4l2object) \
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if (!GST_V4L2_IS_OVERLAY(v4l2object)) \
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{ \
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GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS, \
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(NULL), ("Device cannot handle overlay")); \
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return FALSE; \
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}
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/* checks whether we're in capture mode or not */
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#define GST_V4L2_CHECK_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 not in streaming mode")); \
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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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/* open/close the device */
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gboolean gst_v4l2_open (GstV4l2Object *v4l2object);
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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,
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v4l2_std_id *norm);
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gboolean gst_v4l2_set_norm (GstV4l2Object *v4l2object,
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v4l2_std_id norm);
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gboolean gst_v4l2_get_input (GstV4l2Object * v4l2object,
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gint * input);
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gboolean gst_v4l2_set_input (GstV4l2Object * v4l2object,
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gint input);
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#if 0 /* output not handled by now */
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gboolean gst_v4l2_get_output (GstV4l2Object *v4l2object,
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gint *output);
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gboolean gst_v4l2_set_output (GstV4l2Object *v4l2object,
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gint output);
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#endif /* #if 0 - output not handled by now */
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/* frequency control */
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gboolean gst_v4l2_get_frequency (GstV4l2Object *v4l2object,
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gint tunernum,
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gulong *frequency);
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gboolean gst_v4l2_set_frequency (GstV4l2Object *v4l2object,
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gint tunernum,
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gulong frequency);
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gboolean gst_v4l2_signal_strength (GstV4l2Object *v4l2object,
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gint tunernum,
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gulong *signal);
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/* attribute control */
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gboolean gst_v4l2_get_attribute (GstV4l2Object *v4l2object,
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int attribute,
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int *value);
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gboolean gst_v4l2_set_attribute (GstV4l2Object *v4l2object,
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int attribute,
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const int value);
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gboolean gst_v4l2_get_capabilities (GstV4l2Object * v4l2object);
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/* note: in case this is a build with TTIF logging, we can optimize slightly
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* and avoid the gst_caps_to_string() in case logging isn't enabled by using
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* the TTIF_TRACE_ARG_PROCESSOR feature of ttif_trace_fprintf():
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*/
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#ifdef GST_LOG_OVER_TTIF
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# define LOG_CAPS(obj, caps) G_STMT_START { \
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if (caps) { \
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static TTIF_TRACE_ARG_PROCESSOR proc = { \
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.convert = (char (*)(void *))gst_caps_to_string, \
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.free = (void (*)(char *))g_free \
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}; \
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GST_DEBUG_OBJECT (obj, "%s: %qs", #caps, &proc, (caps)); \
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} else { \
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GST_DEBUG_OBJECT (obj, "null"); \
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} \
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} G_STMT_END
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#else
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# define LOG_CAPS(obj, caps) G_STMT_START { \
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if (caps) { \
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gchar *capstr = gst_caps_to_string (caps); \
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GST_DEBUG_OBJECT (obj, "%s: %s", #caps, capstr); \
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g_free (capstr); \
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} else { \
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GST_DEBUG_OBJECT (obj, "null"); \
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} \
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} G_STMT_END
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#endif
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/* note: the omapzoom kernel v4l2 display driver deviates from the v4l2 API
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* spec in a few areas. For example, we must always have one buffer with
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* the driver before STREAMON until after STREAMOFF. And some interfaces,
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* such as rotation (and mirroring?) are different.
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*
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* this is only a temporary hack, as we should switch to the new driver soon
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*/
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#define OMAPZOOM
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#endif /* __V4L2_CALLS_H__ */
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