query v4lsrc device for fps (which works for webcams)

Original commit message from CVS:
query v4lsrc device for fps (which works for webcams)

ChangeLog

@@ -1,3 +1,16 @@
+2004-05-03  Thomas Vander Stichele  <thomas at apestaart dot org>
+
+	* sys/v4l/gstv4lelement.h:
+	* sys/v4l/gstv4lmjpegsrc.c: (gst_v4lmjpegsrc_class_init):
+	* sys/v4l/gstv4lsrc.c: (gst_v4lsrc_get_fps), (gst_v4lsrc_getcaps),
+	(gst_v4lsrc_buffer_free):
+	* sys/v4l/v4l_calls.c: (gst_v4l_get_capabilities):
+	* sys/v4l/v4lsrc_calls.c: (gst_v4lsrc_queue_frame),
+	(gst_v4lsrc_sync_frame), (gst_v4lsrc_grab_frame),
+	(gst_v4lsrc_requeue_frame):
+        move some debugging categories around
+        query for fps index and set accordingly if found
+
 2004-05-03  Stephane Loeuillet <stephane.loeuillet@tiscali.fr>
 
 	* ext/lame/gstlame.c:

sys/v4l/gstv4lelement.h

@@ -70,9 +70,12 @@ struct _GstV4lElement {
   /* the video buffer (mmap()'ed) */
   guint8 *buffer;
 
-  /* the video-device's capabilities */
+  /* the video device's capabilities */
   struct video_capability vcap;
 
+  /* the video device's window properties */
+  struct video_window vwin;
+
   /* some more info about the current input's capabilities */
   struct video_channel vchan;
 

sys/v4l/gstv4lmjpegsrc.c

@@ -187,7 +187,7 @@ gst_v4lmjpegsrc_class_init (GstV4lMjpegSrcClass * klass)
   g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_USE_FIXED_FPS,
       g_param_spec_boolean ("use_fixed_fps", "Use Fixed FPS",
           "Drop/Insert frames to reach a certain FPS (TRUE) "
-          "or adapt FPS to suit the number of frabbed frames",
+          "or adapt FPS to suit the number of grabbed frames",
           TRUE, G_PARAM_READWRITE));
 
   /* signals */

sys/v4l/gstv4lsrc.c

@@ -277,7 +277,18 @@ static gfloat
 gst_v4lsrc_get_fps (GstV4lSrc * v4lsrc)
 {
   gint norm;
+  gint fps_index;
   gfloat fps;
+  struct video_window *vwin = &GST_V4LELEMENT (v4lsrc)->vwin;
+
+  /* check if we have vwin window properties giving a framerate,
+   * as is done for webcams
+   * See http://www.smcc.demon.nl/webcam/api.html
+   * which is used for the Philips and qce-ga drivers */
+  fps_index = (vwin->flags >> 16) & 0x3F;       /* 6 bit index for framerate */
+  if (fps_index != 0)
+    /* index of 16 corresponds to 15 fps */
+    return fps_index * 15.0 / 16;
 
   if (!v4lsrc->use_fixed_fps && v4lsrc->clock != NULL && v4lsrc->handled > 0) {
     /* try to get time from clock master and calculate fps */
@@ -622,6 +633,8 @@ gst_v4lsrc_getcaps (GstPad * pad)
     return gst_caps_new_any ();
   }
 
+  fps = gst_v4lsrc_get_fps (v4lsrc);
+
   list = gst_caps_new_empty ();
   for (item = v4lsrc->colourspaces; item != NULL; item = item->next) {
     GstCaps *one;
@@ -629,7 +642,6 @@ gst_v4lsrc_getcaps (GstPad * pad)
     one = gst_v4lsrc_palette_to_caps (GPOINTER_TO_INT (item->data));
     if (!one)
       g_print ("Palette %d gave no caps\n", GPOINTER_TO_INT (item->data));
-    fps = gst_v4lsrc_get_fps (v4lsrc);
     GST_DEBUG_OBJECT (v4lsrc,
         "Device reports w: %d-%d, h: %d-%d, fps: %f for palette %d",
         vcap->minwidth, vcap->maxwidth, vcap->minheight, vcap->maxheight, fps,
@@ -895,14 +907,14 @@ gst_v4lsrc_buffer_free (GstBuffer * buf)
   g_free (v4lsrc_private);
   GST_BUFFER_PRIVATE (buf) = 0;
 
-  GST_DEBUG_OBJECT (v4lsrc, "freeing buffer %p with refcount %d for frame %d",
+  GST_LOG_OBJECT (v4lsrc, "freeing buffer %p with refcount %d for frame %d",
       buf, GST_BUFFER_REFCOUNT_VALUE (buf), num);
   if (gst_element_get_state (GST_ELEMENT (v4lsrc)) != GST_STATE_PLAYING)
     return;                     /* we've already cleaned up ourselves */
 
   v4lsrc->use_num_times[num]--;
   if (v4lsrc->use_num_times[num] <= 0) {
-    GST_DEBUG_OBJECT (v4lsrc, "requeueing frame %d", num);
+    GST_LOG_OBJECT (v4lsrc, "requeueing frame %d", num);
     gst_v4lsrc_requeue_frame (v4lsrc, num);
   }
 }

sys/v4l/v4l_calls.c

@@ -94,6 +94,13 @@ gst_v4l_get_capabilities (GstV4lElement * v4lelement)
     return FALSE;
   }
 
+  if (ioctl (v4lelement->video_fd, VIDIOCGWIN, &(v4lelement->vwin)) < 0) {
+    GST_ELEMENT_ERROR (v4lelement, RESOURCE, SETTINGS, (NULL),
+        ("error getting window properties %s of from device %s",
+            g_strerror (errno), v4lelement->videodev));
+    return FALSE;
+  }
+
   return TRUE;
 }
 

sys/v4l/v4lsrc_calls.c

@@ -48,6 +48,11 @@ GST_DEBUG_CATEGORY_EXTERN (v4l_debug);
 	GST_DEBUG_OBJECT (\
 		GST_ELEMENT(v4lsrc), \
 		"V4LSRC: " format, ##args)
+#define LOG(format, args...) \
+	GST_LOG_OBJECT (\
+		GST_ELEMENT(v4lsrc), \
+		"V4LSRC: " format, ##args)
+
 
 /* palette names */
 static const char *palette_name[] = {
@@ -80,7 +85,7 @@ static const char *palette_name[] = {
 static gboolean
 gst_v4lsrc_queue_frame (GstV4lSrc * v4lsrc, gint num)
 {
-  DEBUG ("queueing frame %d", num);
+  LOG ("queueing frame %d", num);
 
   if (v4lsrc->frame_queue_state[num] != QUEUE_STATE_READY_FOR_QUEUE) {
     return FALSE;
@@ -110,7 +115,7 @@ gst_v4lsrc_queue_frame (GstV4lSrc * v4lsrc, gint num)
 static gboolean
 gst_v4lsrc_sync_frame (GstV4lSrc * v4lsrc, gint num)
 {
-  DEBUG ("Syncing on frame %d", num);
+  LOG ("Syncing on frame %d", num);
 
   if (v4lsrc->frame_queue_state[num] != QUEUE_STATE_QUEUED) {
     return FALSE;
@@ -271,7 +276,7 @@ gst_v4lsrc_capture_start (GstV4lSrc * v4lsrc)
 gboolean
 gst_v4lsrc_grab_frame (GstV4lSrc * v4lsrc, gint * num)
 {
-  DEBUG ("grabbing frame");
+  LOG ("grabbing frame");
   GST_V4L_CHECK_OPEN (GST_V4LELEMENT (v4lsrc));
   GST_V4L_CHECK_ACTIVE (GST_V4LELEMENT (v4lsrc));
 
@@ -306,7 +311,7 @@ gst_v4lsrc_grab_frame (GstV4lSrc * v4lsrc, gint * num)
   }
   v4lsrc->sync_frame = (v4lsrc->sync_frame + 1) % v4lsrc->mbuf.frames;
 
-  GST_DEBUG ("grabbed frame %d", *num);
+  GST_LOG ("grabbed frame %d", *num);
 
   g_mutex_unlock (v4lsrc->mutex_queue_state);
 
@@ -343,7 +348,7 @@ gst_v4lsrc_get_buffer (GstV4lSrc * v4lsrc, gint num)
 gboolean
 gst_v4lsrc_requeue_frame (GstV4lSrc * v4lsrc, gint num)
 {
-  DEBUG ("requeueing frame %d", num);
+  LOG ("requeueing frame %d", num);
   GST_V4L_CHECK_OPEN (GST_V4LELEMENT (v4lsrc));
   GST_V4L_CHECK_ACTIVE (GST_V4LELEMENT (v4lsrc));