1 files changed, 307 insertions, 0 deletions
diff --git a/v4l2-apps/lib/v4l2_driver.c b/v4l2-apps/lib/v4l2_driver.c
new file mode 100644
index 000000000..7714d8112
--- /dev/null
+++ b/v4l2-apps/lib/v4l2_driver.c
@@ -0,0 +1,307 @@
+/*
+   Copyright (C) 2006 Mauro Carvalho Chehab <mchehab@infradead.org>
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+  */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <malloc.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "v4l2_driver.h"
+
+/****************************************************************************
+	Auxiliary routines
+ ****************************************************************************/
+static void free_list(struct drv_list **list_ptr)
+{
+	struct drv_list *prev,*cur;
+
+	if (list_ptr==NULL)
+		return;
+
+	prev=*list_ptr;
+	if (prev==NULL)
+		return;
+
+	do {
+		cur=prev->next;
+		if (prev->curr)
+			free (prev->curr);	// Free data
+		free (prev);			// Free list
+		prev=cur;
+	} while (prev);
+
+	*list_ptr=NULL;
+}
+
+/****************************************************************************
+	Open/Close V4L2 devices
+ ****************************************************************************/
+int v4l2_open (char *device, int debug, struct v4l2_driver *drv)
+{
+	int ret;
+
+	memset(drv,0,sizeof(*drv));
+
+	drv->debug=debug;
+
+	if ((drv->fd = open(device, O_RDONLY)) < 0) {
+		perror("Couldn't open video0");
+		return(errno);
+	}
+
+	ret=ioctl(drv->fd,VIDIOC_QUERYCAP,(void *) &drv->cap);
+	if (ret>=0 && drv->debug) {
+		printf ("driver=%s, card=%s, bus=%s, version=0x%08x, "
+			"capabilities=0x%08x\n",
+			drv->cap.driver,drv->cap.card,drv->cap.bus_info,
+			drv->cap.version,drv->cap.capabilities);
+	}
+	return ret;
+}
+
+int v4l2_close (struct v4l2_driver *drv)
+{
+	free_list(&drv->stds);
+	free_list(&drv->inputs);
+	free_list(&drv->fmt_caps);
+
+	return (close(drv->fd));
+}
+
+/****************************************************************************
+	V4L2 Eumberations
+ ****************************************************************************/
+int v4l2_enum_stds (struct v4l2_driver *drv)
+{
+	struct v4l2_standard	*p=NULL;
+	struct drv_list		*list;
+	int			ok=0,ret,i;
+	v4l2_std_id		id;
+
+	free_list(&drv->stds);
+
+	list=drv->stds=calloc(1,sizeof(drv->stds));
+
+	for (i=0; ok==0; i++) {
+		p=calloc(1,sizeof(*p));
+		p->index=i;
+		ok=ioctl(drv->fd,VIDIOC_ENUMSTD,p);
+		if (ok<0) {
+			ok=errno;
+			free(p);
+			break;
+		}
+		if (drv->debug) {
+			printf ("STANDARD: index=%d, id=0x%08x, name=%s, fps=%.3f, "
+				"framelines=%d\n", p->index,
+				(unsigned int)p->id, p->name,
+				1.*p->frameperiod.denominator/p->frameperiod.numerator,
+				p->framelines);
+		}
+		if (list->curr) {
+			list->next=calloc(1,sizeof(*list->next));
+			list=list->next;
+		}
+		list->curr=p;
+	}
+	if (i>0 && ok==-EINVAL)
+		return 0;
+
+	return ok;
+}
+
+int v4l2_enum_input (struct v4l2_driver *drv)
+{
+	struct v4l2_input	*p=NULL;
+	struct drv_list		*list;
+	int			ok=0,ret,i;
+	v4l2_std_id		id;
+
+	free_list(&drv->inputs);
+
+	list=drv->inputs=calloc(1,sizeof(drv->inputs));
+
+	for (i=0; ok==0; i++) {
+		p=calloc(1,sizeof(*p));
+		p->index=i;
+		ok=ioctl(drv->fd,VIDIOC_ENUMINPUT,p);
+		if (ok<0) {
+			ok=errno;
+			free(p);
+			break;
+		}
+		if (drv->debug) {
+			printf ("INPUT: index=%d, name=%s, type=%d, audioset=%d, "
+				"tuner=%d, std=%08x, status=%d\n",
+				p->index,p->name,p->type,p->audioset, p->tuner,
+				(unsigned int)p->std, p->status);
+		}
+		if (list->curr) {
+			list->next=calloc(1,sizeof(*list->next));
+			list=list->next;
+		}
+		list->curr=p;
+	}
+	if (i>0 && ok==-EINVAL)
+		return 0;
+	return ok;
+}
+
+int v4l2_enum_fmt_cap (struct v4l2_driver *drv)
+{
+	struct v4l2_fmtdesc 	*p=NULL;
+	struct v4l2_format	fmt;
+	struct drv_list		*list;
+	int			ok=0,ret,i;
+	v4l2_std_id		id;
+
+	free_list(&drv->fmt_caps);
+
+	list=drv->fmt_caps=calloc(1,sizeof(drv->fmt_caps));
+
+	for (i=0; ok==0; i++) {
+		p=calloc(1,sizeof(*p));
+		p->index=i;
+		p->type =V4L2_BUF_TYPE_VIDEO_CAPTURE;
+
+		ok=ioctl(drv->fd,VIDIOC_ENUM_FMT,p);
+		if (ok<0) {
+			ok=errno;
+			free(p);
+			break;
+		}
+		if (drv->debug) {
+			printf ("FORMAT: index=%d, type=%d, flags=%d, description=%s\n\t"
+				"pixelformat=0x%08x\n",
+				p->index, p->type, p->flags,p->description,
+				p->pixelformat);
+		}
+		if (list->curr) {
+			list->next=calloc(1,sizeof(*list->next));
+			list=list->next;
+		}
+		list->curr=p;
+	}
+	if (i>0 && ok==-EINVAL)
+		return 0;
+	return ok;
+}
+
+/****************************************************************************
+	Set routines - currently, it also checks results with Get
+ ****************************************************************************/
+int v4l2_setget_std (struct v4l2_driver *drv, enum v4l2_direction dir, v4l2_std_id *id)
+{
+	v4l2_std_id		s_id=*id;
+	int			ret=0;
+	char			s[256];
+
+	if (dir & V4L2_SET) {
+		ret=ioctl(drv->fd,VIDIOC_S_STD,&s_id);
+		if (ret<0) {
+			ret=errno;
+
+			sprintf (s,"while trying to set STD to %08x",
+								(unsigned int) id);
+			perror(s);
+		}
+	}
+
+	if (dir & V4L2_GET) {
+		ret=ioctl(drv->fd,VIDIOC_G_STD,&s_id);
+		if (ret<0) {
+			ret=errno;
+			perror ("while trying to get STD id");
+		}
+	}
+
+	if (dir == V4L2_SET_GET) {
+		if (*id & s_id) {
+			if (*id != s_id) {
+				printf ("Warning: Received a std subset (%08x"
+					" std) while trying to adjust to %08x\n",
+					(unsigned int) s_id,(unsigned int) *id);
+			}
+		} else {
+			fprintf (stderr,"Error: Received %08x std while trying"
+				" to adjust to %08x\n",
+				(unsigned int) s_id,(unsigned int) *id);
+		}
+	}
+	return ret;
+}
+
+int v4l2_setget_input (struct v4l2_driver *drv, enum v4l2_direction dir, struct v4l2_input *input)
+{
+	int			ok=0,ret,i;
+	unsigned int		inp=input->index;
+	char			s[256];
+
+	if (dir & V4L2_SET) {
+		ret=ioctl(drv->fd,VIDIOC_S_INPUT,input);
+		if (ret<0) {
+			ret=errno;
+			sprintf (s,"while trying to set INPUT to %d\n", inp);
+			perror(s);
+		}
+	}
+
+	if (dir & V4L2_GET) {
+		ret=ioctl(drv->fd,VIDIOC_G_INPUT,input);
+		if (ret<0) {
+			perror ("while trying to get INPUT id\n");
+		}
+	}
+
+	if (dir & V4L2_SET_GET) {
+		if (input->index != inp) {
+			printf ("Input is different than expected (received %i, set %i)\n",
+						inp, input->index);
+		}
+	}
+
+	return ok;
+}
+
+/****************************************************************************
+	Get routines
+ ****************************************************************************/
+int v4l2_get_parm (struct v4l2_driver *drv)
+{
+	int ret;
+	struct v4l2_captureparm *c;
+
+	drv->parm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	if ((ret=ioctl(drv->fd,VIDIOC_G_PARM,&drv->parm))>=0) {
+		c=&drv->parm.parm.capture;
+		printf ("PARM: capability=%d, capturemode=%d, frame time =%.3f ns "
+			"ext=%x, readbuf=%d\n",
+			c->capability,
+			c->capturemode,
+			100.*c->timeperframe.numerator/c->timeperframe.denominator,
+			c->extendedmode, c->readbuffers);
+	} else {
+		ret=errno;
+
+		perror ("VIDIOC_G_PARM");
+	}
+
+	return ret;
+}