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pngenc: add support for 8- and 16-bit gray images

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Add support for direct encoding of 8- and 16-bit big endian gray images.

https://bugzilla.gnome.org/show_bug.cgi?id=672025
This commit is contained in:
Andrej Gelenberg 2012-03-13 23:08:38 +01:00 committed by Tim-Philipp Müller
parent 265a5bfa9b
commit 9fb6766870
2 changed files with 13 additions and 2 deletions
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14
ext/libpng/gstpngenc.c
View file

@ -66,7 +66,7 @@ static GstStaticPadTemplate pngenc_sink_template =
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_RGBA ";" GST_VIDEO_CAPS_RGB ";"
GST_VIDEO_CAPS_GRAY8)
GST_VIDEO_CAPS_GRAY8 ";" GST_VIDEO_CAPS_GRAY16 ("BIG_ENDIAN"))
);
/* static GstElementClass *parent_class = NULL; */
@ -167,6 +167,7 @@ gst_pngenc_setcaps (GstPad * pad, GstCaps * caps)
pngenc->png_color_type = PNG_COLOR_TYPE_RGB;
break;
case GST_VIDEO_FORMAT_GRAY8:
case GST_VIDEO_FORMAT_GRAY16_BE:
pngenc->png_color_type = PNG_COLOR_TYPE_GRAY;
break;
default:
@ -174,6 +175,15 @@ gst_pngenc_setcaps (GstPad * pad, GstCaps * caps)
goto done;
}
switch (format) {
case GST_VIDEO_FORMAT_GRAY16_BE:
pngenc->depth = 16;
break;
default: /* GST_VIDEO_FORMAT_RGB and GST_VIDEO_FORMAT_GRAY8 */
pngenc->depth = 8;
break;
}
if (G_UNLIKELY (pngenc->width < 16 || pngenc->width > 1000000 ||
pngenc->height < 16 || pngenc->height > 1000000)) {
ret = FALSE;
@ -321,7 +331,7 @@ gst_pngenc_chain (GstPad * pad, GstBuffer * buf)
pngenc->png_info_ptr,
pngenc->width,
pngenc->height,
8,
pngenc->depth,
pngenc->png_color_type,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);

1
ext/libpng/gstpngenc.h
View file

@ -50,6 +50,7 @@ struct _GstPngEnc
png_infop png_info_ptr;
gint png_color_type;
gint depth;
gint width;
gint height;
gint stride;