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video: add video copy function

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Add a function to copy a video frame, taking care of source and destination
strides.
This commit is contained in:
Wim Taymans 2011-06-22 15:25:35 +02:00
parent 6633910500
commit 1d9deae5be
2 changed files with 53 additions and 0 deletions
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50
gst-libs/gst/video/video.c
View file

@ -966,6 +966,56 @@ gst_video_frame_unmap (GstVideoFrame * frame)
}
}
/**
* gst_video_frame_copy:
* @dest: a #GstVideoFrame
* @src: a #GstVideoFrame
*
* Copy the contents from @src to @dest.
*
* Returns: TRUE if the contents could be copied.
*/
gboolean
gst_video_frame_copy (GstVideoFrame * dest, const GstVideoFrame * src)
{
guint i, n_planes;
const GstVideoInfo *sinfo;
GstVideoInfo *dinfo;
sinfo = &src->info;
dinfo = &dest->info;
g_return_val_if_fail (dinfo->format == sinfo->format, FALSE);
g_return_val_if_fail (dinfo->width == sinfo->width
&& dinfo->height == sinfo->height, FALSE);
n_planes = dinfo->n_planes;
for (i = 0; i < n_planes; i++) {
guint w, h, j;
guint8 *sp, *dp;
gint ss, ds;
sp = src->data[i];
dp = dest->data[i];
ss = sinfo->stride[i];
ds = dinfo->stride[i];
w = MIN (ABS (ss), ABS (ds));
h = gst_video_format_get_component_height (dinfo->format, i, dinfo->height);
GST_DEBUG ("w %d h %d", w, h);
for (j = 0; j < h; j++) {
memcpy (dp, sp, w);
dp += ds;
sp += ss;
}
}
return TRUE;
}
/**
* get_stride:
* @format: a #GstVideoFormat

3
gst-libs/gst/video/video.h
View file

@ -256,6 +256,9 @@ gboolean gst_video_frame_map (GstVideoFrame *frame, GstVideoInfo *inf
GstBuffer *buffer, GstMapFlags flags);
void gst_video_frame_unmap (GstVideoFrame *frame);
gboolean gst_video_frame_copy (GstVideoFrame *dest, const GstVideoFrame *src);
#define GST_VIDEO_SIZE_RANGE "(int) [ 1, max ]"
#define GST_VIDEO_FPS_RANGE "(fraction) [ 0, max ]"