drv0-v4l2.c

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/*
 * interface to the v4l2 driver
 *
 *   (c) 1998-2002 Gerd Knorr <[e-mail]>
 *
 */
#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <math.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <signal.h>
#include <inttypes.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <pthread.h>

#include <asm/types.h>		/* XXX glibc */
#include "videodev2.h"

#include "grab-ng.h"

#include "struct-dump.h"
#include "struct-v4l2.h"

/* ---------------------------------------------------------------------- */

/* open+close */
static void*   v4l2_init(char *device);
static int     v4l2_open(void *handle);
static int     v4l2_close(void *handle);
static int     v4l2_fini(void *handle);
static struct ng_devinfo* v4l2_probe(int verbose);

/* attributes */
static char*   v4l2_devname(void *handle);
static char*   v4l2_busname(void *handle);
static int     v4l2_flags(void *handle);
static struct ng_attribute* v4l2_attrs(void *handle);
static int     v4l2_read_attr(struct ng_attribute*);
static void    v4l2_write_attr(struct ng_attribute*, int val);

#if 0
/* overlay */
static int   v4l2_setupfb(void *handle, struct ng_video_fmt *fmt, void *base);
static int   v4l2_overlay(void *handle, struct ng_video_fmt *fmt, int x, int y,
			  struct OVERLAY_CLIP *oc, int count, int aspect);
#endif

/* capture video */
static int v4l2_setformat(void *handle, struct ng_video_fmt *fmt);
static int v4l2_startvideo(void *handle, int fps, unsigned int buffers);
static void v4l2_stopvideo(void *handle);
static struct ng_video_buf* v4l2_nextframe(void *handle);
static struct ng_video_buf* v4l2_getimage(void *handle);

/* mpeg */
static char *v4l2_setup_mpeg(void *handle, int flags);

/* tuner */
static unsigned long v4l2_getfreq(void *handle);
static void v4l2_setfreq(void *handle, unsigned long freq);
static int v4l2_tuned(void *handle);

/* ---------------------------------------------------------------------- */

#define WANTED_BUFFERS 32

#define MAX_INPUT   16
#define MAX_NORM    16
#define MAX_FORMAT  32
#define MAX_CTRL    32

struct v4l2_handle {
    int                         fd;
    char                        *device;

    /* device descriptions */
    int                         ninputs,nstds,nfmts;
    struct v4l2_capability	cap;
    struct v4l2_streamparm	streamparm;
    struct v4l2_input		inp[MAX_INPUT];
    struct v4l2_standard      	std[MAX_NORM];
    struct v4l2_fmtdesc		fmt[MAX_FORMAT];
    struct v4l2_queryctrl	ctl[MAX_CTRL*2];
    int                         flags;
    int                         mpeg;

    /* attributes */
    int                         nattr;
    struct ng_attribute         *attr;

    /* capture */
    int                            fps,first;
    long long                      start;
    struct v4l2_format             fmt_v4l2;
    struct ng_video_fmt            fmt_me;
    struct v4l2_requestbuffers     reqbufs;
    struct v4l2_buffer             buf_v4l2[WANTED_BUFFERS];
    struct ng_video_buf            buf_me[WANTED_BUFFERS];
    unsigned int                   queue,waiton;

    /* overlay */
    struct v4l2_framebuffer        ov_fb;
    struct v4l2_format             ov_win;
    struct v4l2_clip               ov_clips[256];
#if 0
    enum v4l2_field                ov_fields;
#endif
    int                            ov_error;
    int                            ov_enabled;
    int                            ov_on;
};

static void v4l2_probe_mpeg(struct v4l2_handle *h);

/* ---------------------------------------------------------------------- */

struct ng_vid_driver v4l2_driver = {
    .name          = "v4l2",
    .priority      = 1,

    .init          = v4l2_init,
    .open          = v4l2_open,
    .close         = v4l2_close,
    .fini          = v4l2_fini,
    .devname       = v4l2_devname,
    .busname       = v4l2_busname,
    .probe         = v4l2_probe,
    
    .capabilities  = v4l2_flags,
    .list_attrs    = v4l2_attrs,

#if 0
    .setupfb       = v4l2_setupfb,
    .overlay       = v4l2_overlay,
#endif

    .setformat     = v4l2_setformat,
    .startvideo    = v4l2_startvideo,
    .stopvideo     = v4l2_stopvideo,
    .nextframe     = v4l2_nextframe,
    .getimage      = v4l2_getimage,
    
    .getfreq       = v4l2_getfreq,
    .setfreq       = v4l2_setfreq,
    .is_tuned      = v4l2_tuned,

    .setup_mpeg    = v4l2_setup_mpeg,
};

static __u32 xawtv_pixelformat[VIDEO_FMT_COUNT] = {
    [ VIDEO_RGB08 ]    = V4L2_PIX_FMT_HI240,
    [ VIDEO_GRAY ]     = V4L2_PIX_FMT_GREY,
    [ VIDEO_RGB15_LE ] = V4L2_PIX_FMT_RGB555,
    [ VIDEO_RGB16_LE ] = V4L2_PIX_FMT_RGB565,
    [ VIDEO_RGB15_BE ] = V4L2_PIX_FMT_RGB555X,
    [ VIDEO_RGB16_BE ] = V4L2_PIX_FMT_RGB565X,
    [ VIDEO_BGR24 ]    = V4L2_PIX_FMT_BGR24,
    [ VIDEO_BGR32 ]    = V4L2_PIX_FMT_BGR32,
    [ VIDEO_RGB24 ]    = V4L2_PIX_FMT_RGB24,
    [ VIDEO_YUYV ]     = V4L2_PIX_FMT_YUYV,
    [ VIDEO_UYVY ]     = V4L2_PIX_FMT_UYVY,
    [ VIDEO_YUV422P ]  = V4L2_PIX_FMT_YUV422P,
    [ VIDEO_YUV420P ]  = V4L2_PIX_FMT_YUV420,
};

static struct STRTAB stereo[] = {
    {  V4L2_TUNER_MODE_MONO,   "mono"    },
    {  V4L2_TUNER_MODE_STEREO, "stereo"  },
    {  V4L2_TUNER_MODE_LANG1,  "lang1"   },
    {  V4L2_TUNER_MODE_LANG2,  "lang2"   },
    { -1, NULL },
};

/* ---------------------------------------------------------------------- */
/* debug output                                                           */

#define PREFIX "ioctl: "

static int
xioctl(int fd, int cmd, void *arg, int mayfail)
{
    int rc;

    rc = ioctl(fd,cmd,arg);
    if (0 == rc && ng_debug < 2)
	return rc;
    if (mayfail && errno == mayfail && ng_debug < 2)
	return rc;
    print_ioctl(stderr,ioctls_v4l2,PREFIX,cmd,arg);
    fprintf(stderr,": %s\n",(rc == 0) ? "ok" : strerror(errno));
    return rc;
}

static void
print_bufinfo(struct v4l2_buffer *buf)
{
    static char *type[] = {
	[V4L2_BUF_TYPE_VIDEO_CAPTURE] = "video-cap",
	[V4L2_BUF_TYPE_VIDEO_OVERLAY] = "video-over",
	[V4L2_BUF_TYPE_VIDEO_OUTPUT]  = "video-out",
	[V4L2_BUF_TYPE_VBI_CAPTURE]   = "vbi-cap",
	[V4L2_BUF_TYPE_VBI_OUTPUT]    = "vbi-out",
    };

    fprintf(stderr,"v4l2: buf %d: %s 0x%x+%d, used %d\n",
	    buf->index,
	    buf->type < sizeof(type)/sizeof(char*)
	    ? type[buf->type] : "unknown",
	    buf->m.offset,buf->length,buf->bytesused);
}

/* ---------------------------------------------------------------------- */
/* helpers                                                                */

static void
get_device_capabilities(struct v4l2_handle *h)
{
    int i;
    
    for (h->ninputs = 0; h->ninputs < MAX_INPUT; h->ninputs++) {
	h->inp[h->ninputs].index = h->ninputs;
	if (-1 == xioctl(h->fd, VIDIOC_ENUMINPUT, &h->inp[h->ninputs], EINVAL))
	    break;
    }
    for (h->nstds = 0; h->nstds < MAX_NORM; h->nstds++) {
	h->std[h->nstds].index = h->nstds;
	if (-1 == xioctl(h->fd, VIDIOC_ENUMSTD, &h->std[h->nstds], EINVAL))
	    break;
    }
    for (h->nfmts = 0; h->nfmts < MAX_FORMAT; h->nfmts++) {
	h->fmt[h->nfmts].index = h->nfmts;
	h->fmt[h->nfmts].type  = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	if (-1 == xioctl(h->fd, VIDIOC_ENUM_FMT, &h->fmt[h->nfmts], EINVAL))
	    break;
    }

    h->streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
    ioctl(h->fd,VIDIOC_G_PARM,&h->streamparm);

    /* controls */
    for (i = 0; i < MAX_CTRL; i++) {
	h->ctl[i].id = V4L2_CID_BASE+i;
	if (-1 == xioctl(h->fd, VIDIOC_QUERYCTRL, &h->ctl[i], EINVAL) ||
	    (h->ctl[i].flags & V4L2_CTRL_FLAG_DISABLED))
	    h->ctl[i].id = -1;
    }
    for (i = 0; i < MAX_CTRL; i++) {
	h->ctl[i+MAX_CTRL].id = V4L2_CID_PRIVATE_BASE+i;
	if (-1 == xioctl(h->fd, VIDIOC_QUERYCTRL, &h->ctl[i+MAX_CTRL], EINVAL) ||
	    (h->ctl[i+MAX_CTRL].flags & V4L2_CTRL_FLAG_DISABLED))
	    h->ctl[i+MAX_CTRL].id = -1;
    }
}

static struct STRTAB *
build_norms(struct v4l2_handle *h)
{
    struct STRTAB *norms;
    int i;

    norms = malloc(sizeof(struct STRTAB) * (h->nstds+1));
    for (i = 0; i < h->nstds; i++) {
	norms[i].nr  = i;
	norms[i].str = h->std[i].name;
    }
    norms[i].nr  = -1;
    norms[i].str = NULL;
    return norms;
}

static struct STRTAB *
build_inputs(struct v4l2_handle *h)
{
    struct STRTAB *inputs;
    int i;

    inputs = malloc(sizeof(struct STRTAB) * (h->ninputs+1));
    for (i = 0; i < h->ninputs; i++) {
	inputs[i].nr  = i;
	inputs[i].str = h->inp[i].name;
    }
    inputs[i].nr  = -1;
    inputs[i].str = NULL;
    return inputs;
}

/* ---------------------------------------------------------------------- */

static struct V4L2_ATTR {
    unsigned int id;
    unsigned int v4l2;
} v4l2_attr[] = {
    { ATTR_ID_VOLUME,   V4L2_CID_AUDIO_VOLUME },
    { ATTR_ID_MUTE,     V4L2_CID_AUDIO_MUTE   },
    { ATTR_ID_COLOR,    V4L2_CID_SATURATION   },
    { ATTR_ID_BRIGHT,   V4L2_CID_BRIGHTNESS   },
    { ATTR_ID_HUE,      V4L2_CID_HUE          },
    { ATTR_ID_CONTRAST, V4L2_CID_CONTRAST     },
};
#define NUM_ATTR (sizeof(v4l2_attr)/sizeof(struct V4L2_ATTR))

static struct STRTAB*
v4l2_menu(int fd, const struct v4l2_queryctrl *ctl)
{
    struct STRTAB *menu;
    struct v4l2_querymenu item;
    int i;

    menu = malloc(sizeof(struct STRTAB) * (ctl->maximum-ctl->minimum+2));
    for (i = ctl->minimum; i <= ctl->maximum; i++) {
	item.id = ctl->id;
	item.index = i;
	if (-1 == xioctl(fd, VIDIOC_QUERYMENU, &item, 0)) {
	    free(menu);
	    return NULL;
	}
	menu[i-ctl->minimum].nr  = i;
	menu[i-ctl->minimum].str = strdup(item.name);
    }
    menu[i-ctl->minimum].nr  = -1;
    menu[i-ctl->minimum].str = NULL;
    return menu;
}

static void
v4l2_add_attr(struct v4l2_handle *h, struct v4l2_queryctrl *ctl,
	      int id, struct STRTAB *choices)
{
    static int private_ids = ATTR_ID_COUNT;
    unsigned int i;
    
    h->attr = realloc(h->attr,(h->nattr+2) * sizeof(struct ng_attribute));
    memset(h->attr+h->nattr,0,sizeof(struct ng_attribute)*2);
    if (ctl) {
	for (i = 0; i < NUM_ATTR; i++)
	    if (v4l2_attr[i].v4l2 == ctl->id)
		break;
	if (i != NUM_ATTR) {
	    h->attr[h->nattr].id   = v4l2_attr[i].id;
	} else {
	    h->attr[h->nattr].id   = private_ids++;
	}
	h->attr[h->nattr].name     = ctl->name;
	h->attr[h->nattr].priority = 2;
	h->attr[h->nattr].priv     = ctl;
	h->attr[h->nattr].defval   = ctl->default_value;
	switch (ctl->type) {
	case V4L2_CTRL_TYPE_INTEGER:
	    h->attr[h->nattr].type    = ATTR_TYPE_INTEGER;
	    h->attr[h->nattr].defval  = ctl->default_value;
	    h->attr[h->nattr].min     = ctl->minimum;
	    h->attr[h->nattr].max     = ctl->maximum;
	    break;
	case V4L2_CTRL_TYPE_BOOLEAN:
	    h->attr[h->nattr].type    = ATTR_TYPE_BOOL;
	    break;
	case V4L2_CTRL_TYPE_MENU:
	    h->attr[h->nattr].type    = ATTR_TYPE_CHOICE;
	    h->attr[h->nattr].choices = v4l2_menu(h->fd, ctl);
	    break;
	default:
	    memset(h->attr+h->nattr,0,sizeof(struct ng_attribute)*2);
	    return;
	}
    } else {
	/* for norms + inputs */
	h->attr[h->nattr].id      = id;
	if (-1 == h->attr[h->nattr].id)
	    h->attr[h->nattr].id  = private_ids++;
	h->attr[h->nattr].defval  = 0;
	h->attr[h->nattr].type    = ATTR_TYPE_CHOICE;
	h->attr[h->nattr].choices = choices;
    }
    if (h->attr[h->nattr].id < ATTR_ID_COUNT)
	h->attr[h->nattr].name = ng_attr_to_desc[h->attr[h->nattr].id];

    h->attr[h->nattr].read    = v4l2_read_attr;
    h->attr[h->nattr].write   = v4l2_write_attr;
    h->attr[h->nattr].handle  = h;
    h->nattr++;
}

static int v4l2_read_attr(struct ng_attribute *attr)
{
    struct v4l2_handle *h = attr->handle;
    const struct v4l2_queryctrl *ctl = attr->priv;
    struct v4l2_control c;
    struct v4l2_tuner tuner;
    v4l2_std_id std;
    int value = 0;
    int i;

    if (NULL != ctl) {
	c.id = ctl->id;
	xioctl(h->fd,VIDIOC_G_CTRL,&c,0);
	value = c.value;
	
    } else if (attr->id == ATTR_ID_NORM) {
	value = -1;
	xioctl(h->fd,VIDIOC_G_STD,&std,0);
	for (i = 0; i < h->nstds; i++)
	    if (std & h->std[i].id)
		value = i;
	
    } else if (attr->id == ATTR_ID_INPUT) {
	xioctl(h->fd,VIDIOC_G_INPUT,&value,0);

    } else if (attr->id == ATTR_ID_AUDIO_MODE) {
	memset(&tuner,0,sizeof(tuner));
	xioctl(h->fd,VIDIOC_G_TUNER,&tuner,0);
	value = tuner.audmode;