Basic webcam (video4linux) autodetection

[kdenlive] / src / v4l / src_v4l2.c

diff --git a/src/v4l/src_v4l2.c b/src/v4l/src_v4l2.c
index bc4072e4ecd7237c73de5ef3af679a0f5065187d..641913f6bf230a333eb26eb11ff864d9ef053e5a 100644 (file)
--- a/src/v4l/src_v4l2.c
+++ b/src/v4l/src_v4l2.c
@@ -82,7 +82,7 @@ int src_v4l2_get_capability(src_t *src)
                /*ERROR("%s: Not a V4L2 device?", src->source);*/
                return(-1);
        }
-       
+       fprintf(stderr, "cap.card: \"%s\"", s->cap.card);
        /*DEBUG("%s information:", src->source);
        DEBUG("cap.driver: \"%s\"", s->cap.driver);
        DEBUG("cap.card: \"%s\"", s->cap.card);
@@ -802,6 +802,62 @@ int src_v4l2_set_read(src_t *src)
        return(0);
 }
 
+static const char *src_v4l2_query(src_t *src, int *width, int *height)
+{
+       if(!src->source)
+       {
+               /*ERROR("No device name specified.");*/
+               fprintf(stderr, "No device name specified.");
+               return NULL;
+       }
+       src_v4l2_t *s;  
+
+       /* Allocate memory for the state structure. */
+       s = calloc(sizeof(src_v4l2_t), 1);
+       if(!s)
+       {
+               fprintf(stderr, "Out of memory.");
+               return NULL;
+       }
+       
+       src->state = (void *) s;
+
+       /* Open the device. */
+       s->fd = open(src->source, O_RDWR | O_NONBLOCK);
+       if(s->fd < 0)
+       {
+               fprintf(stderr, "Cannot open device.");
+               free(s);
+               return NULL;
+       }
+
+       if(ioctl(s->fd, VIDIOC_QUERYCAP, &s->cap) < 0) {
+           src_v4l2_close(src);
+           fprintf(stderr, "Cannot get capabilities.");
+           return NULL;
+       }
+       char * res = (char*) s->cap.card;
+       if(!s->cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) {
+           width = 0;
+           height = 0;
+       }
+       else {
+           struct v4l2_format format;
+           memset(&format,0,sizeof(format));
+            format.type  = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+            if (ioctl(s->fd,VIDIOC_G_FMT,&format) < 0) {
+                fprintf(stderr, "Cannot get format.");
+            }
+            else {
+               *width = format.fmt.pix.width;
+               *height = format.fmt.pix.height;
+               fprintf(stderr, "Size: %d, %d.", width, height);
+           }
+       }
+       src_v4l2_close(src);
+       return res;
+}
+
 static int src_v4l2_open(src_t *src)
 {
        src_v4l2_t *s;
@@ -989,7 +1045,8 @@ src_mod_t src_v4l2 = {
        "v4l2", SRC_TYPE_DEVICE,
        src_v4l2_open,
        src_v4l2_close,
-       src_v4l2_grab
+       src_v4l2_grab,
+       src_v4l2_query
 };
 
 #else /* #ifdef HAVE_V4L2 */
@@ -998,7 +1055,8 @@ src_mod_t src_v4l2 = {
        "", SRC_TYPE_NONE,
         NULL,
         NULL,
-        NULL
+        NULL,
+       NULL
 };
 
 #endif /* #ifdef HAVE_V4L2 */