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camerabin: Scale incoming frames if their size does not match requested size

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If capture preparation in videosrc results in frame size different
from requested size, then we need to scale them.
This commit is contained in:
Lasse Laukkanen 2009-02-20 12:07:33 +02:00 committed by René Stadler
parent 617f34895c
commit 24d99bbe56
1 changed files with 71 additions and 20 deletions
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91
gst/camerabin/gstcamerabin.c
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@ -1266,24 +1266,75 @@ gst_camerabin_set_capsfilter_caps (GstCameraBin * camera, GstCaps * new_caps)
g_object_set (G_OBJECT (camera->src_zoom_filter), "caps", new_caps, NULL);
}
static void
gst_camerabin_adapt_video_resolution (GstCameraBin * camera, GstCaps * caps)
{
GstStructure *st;
gint width = 0, height = 0;
GstCaps *filter_caps = NULL;
/* Get width and height from caps */
st = gst_caps_get_structure (caps, 0);
gst_structure_get_int (st, "width", &width);
gst_structure_get_int (st, "height", &height);
GST_DEBUG_OBJECT (camera,
"changing %dx%d -> %dx%d filter to %" GST_PTR_FORMAT,
camera->width, camera->height, width, height, camera->src_filter);
/* Apply the width and height to filter caps */
g_object_get (G_OBJECT (camera->src_filter), "caps", &filter_caps, NULL);
filter_caps = gst_caps_make_writable (filter_caps);
gst_caps_set_simple (filter_caps, "width", G_TYPE_INT, width,
"height", G_TYPE_INT, height, NULL);
g_object_set (G_OBJECT (camera->src_filter), "caps", filter_caps, NULL);
gst_caps_unref (filter_caps);
/* FIXME: implement cropping according to requested aspect ratio */
}
/*
* img_capture_prepared:
* @data: camerabin object
* @caps: caps describing the prepared image format
*
* Callback which is called after image capture has been prepared.
*/
static void
img_capture_prepared (gpointer data)
img_capture_prepared (gpointer data, GstCaps * caps)
{
GstCameraBin *camera = GST_CAMERABIN (data);
GstStructure *st, *new_st;
gint i;
const gchar *field_name;
GST_INFO_OBJECT (camera, "image capture prepared");
if (camera->image_capture_caps) {
/* Set capsfilters to match arriving image data */
gst_camerabin_set_capsfilter_caps (camera, camera->image_capture_caps);
/* It is possible we are about to get something else that we requested */
if (!gst_caps_is_equal (camera->image_capture_caps, caps)) {
/* If capture preparation has added new fields to requested caps,
we need to copy them */
st = gst_caps_get_structure (camera->image_capture_caps, 0);
new_st = gst_structure_copy (st);
st = gst_caps_get_structure (caps, 0);
for (i = 0; i < gst_structure_n_fields (st); i++) {
field_name = gst_structure_nth_field_name (st, i);
if (!gst_structure_has_field (new_st, field_name)) {
GST_DEBUG_OBJECT (camera, "new field in prepared caps: %s", field_name);
gst_structure_set_value (new_st, field_name,
gst_structure_get_value (st, field_name));
}
}
gst_caps_replace (&camera->image_capture_caps,
gst_caps_new_full (new_st, NULL));
}
/* Update capsfilters */
gst_camerabin_set_capsfilter_caps (camera, camera->image_capture_caps);
/* If incoming buffer resolution is different from what application
requested, then we need to fix this in camerabin */
gst_camerabin_adapt_video_resolution (camera, caps);
g_object_set (G_OBJECT (camera->src_out_sel), "resend-latest", FALSE,
"active-pad", camera->pad_src_img, NULL);
gst_camerabin_rewrite_tags (camera);
@ -1300,9 +1351,7 @@ static void
gst_camerabin_start_image_capture (GstCameraBin * camera)
{
GstStateChangeReturn state_ret;
gboolean wait_for_prepare = FALSE;
gint width = 0, height = 0, fps_n = 0, fps_d = 0;
GstStructure *st;
gboolean wait_for_prepare = FALSE, ret = FALSE;
GST_INFO_OBJECT (camera, "starting image capture");
@ -1312,17 +1361,6 @@ gst_camerabin_start_image_capture (GstCameraBin * camera)
/* Start image capture preparations using photography iface */
wait_for_prepare = TRUE;
g_mutex_lock (camera->capture_mutex);
if (camera->image_capture_caps) {
st = gst_caps_get_structure (camera->image_capture_caps, 0);
} else {
st = gst_caps_get_structure (camera->view_finder_caps, 0);
}
gst_structure_get_int (st, "width", &width);
gst_structure_get_int (st, "height", &height);
gst_structure_get_fraction (st, "framerate", &fps_n, &fps_d);
/* Set image capture resolution and frame rate */
g_signal_emit_by_name (camera->src_vid_src, "user-res-fps",
width, height, fps_n, fps_d, 0);
/* Enable still image capture mode in v4l2camsrc */
if (g_object_class_find_property (G_OBJECT_GET_CLASS (camera->src_vid_src),
@ -1330,9 +1368,17 @@ gst_camerabin_start_image_capture (GstCameraBin * camera)
g_object_set (G_OBJECT (camera->src_vid_src), "capture-mode", 1, NULL);
}
if (!camera->image_capture_caps) {
camera->image_capture_caps = gst_caps_copy (camera->view_finder_caps);
}
/* Start preparations for image capture */
gst_photography_prepare_for_capture (GST_PHOTOGRAPHY (camera->src_vid_src),
(GstPhotoCapturePrepared) img_capture_prepared, camera);
GST_DEBUG_OBJECT (camera, "prepare image capture caps %" GST_PTR_FORMAT,
camera->image_capture_caps);
ret =
gst_photography_prepare_for_capture (GST_PHOTOGRAPHY
(camera->src_vid_src), (GstPhotoCapturePrepared) img_capture_prepared,
camera->image_capture_caps, camera);
camera->capturing = TRUE;
g_mutex_unlock (camera->capture_mutex);
}
@ -1345,12 +1391,17 @@ gst_camerabin_start_image_capture (GstCameraBin * camera)
g_object_set (G_OBJECT (camera->src_out_sel), "resend-latest", TRUE,
"active-pad", camera->pad_src_img, NULL);
camera->capturing = TRUE;
ret = TRUE;
g_mutex_unlock (camera->capture_mutex);
} else {
GST_WARNING_OBJECT (camera, "imagebin state change failed");
gst_element_set_state (camera->imgbin, GST_STATE_NULL);
}
}
if (!ret) {
GST_WARNING_OBJECT (camera, "starting image capture failed");
}
}
/*