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pngenc: Support 8 bit grayscale

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Adds support to 8 bit grayscale input
This commit is contained in:
Thiago Santos 2010-05-18 19:42:58 -03:00
parent bca4ca631f
commit ca0652a572
1 changed files with 13 additions and 2 deletions
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15
ext/libpng/gstpngenc.c
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@ -67,7 +67,8 @@ static GstStaticPadTemplate pngenc_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_RGBA ";" GST_VIDEO_CAPS_RGB)
GST_STATIC_CAPS (GST_VIDEO_CAPS_RGBA ";" GST_VIDEO_CAPS_RGB ";"
GST_VIDEO_CAPS_GRAY8)
);
/* static GstElementClass *parent_class = NULL; */
@ -160,6 +161,8 @@ gst_pngenc_setcaps (GstPad * pad, GstCaps * caps)
if (pngenc->bpp == 32)
pngenc->stride = pngenc->width * 4;
else if (pngenc->bpp == 8)
pngenc->stride = GST_ROUND_UP_4 (pngenc->width);
else
pngenc->stride = GST_ROUND_UP_4 (pngenc->width * 3);
@ -235,6 +238,7 @@ gst_pngenc_chain (GstPad * pad, GstBuffer * buf)
{
GstPngEnc *pngenc;
gint row_index;
gint color_type;
png_byte *row_pointers[MAX_HEIGHT];
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *encoded_buf = NULL;
@ -278,12 +282,19 @@ gst_pngenc_chain (GstPad * pad, GstBuffer * buf)
PNG_FILTER_NONE | PNG_FILTER_VALUE_NONE);
png_set_compression_level (pngenc->png_struct_ptr, pngenc->compression_level);
if (pngenc->bpp == 32)
color_type = PNG_COLOR_TYPE_RGBA;
else if (pngenc->bpp == 8)
color_type = PNG_COLOR_TYPE_GRAY;
else
color_type = PNG_COLOR_TYPE_RGB;
png_set_IHDR (pngenc->png_struct_ptr,
pngenc->png_info_ptr,
pngenc->width,
pngenc->height,
8,
(pngenc->bpp == 32) ? PNG_COLOR_TYPE_RGBA : PNG_COLOR_TYPE_RGB,
color_type,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);