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pngdec: add support for video/x-raw-gray formats

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pngdec can now decode gray 8- and 16-bit images without alpha channel
direct to video/x-raw-gray format. 16-bit gray images have big-endian
format, because it's native PNG endianness. Gray images with alpha
channel still converted to RGBA.

Signed-off-by: Andrej Gelenberg <andrej.gelenberg@udo.edu>
This commit is contained in:
Andrej Gelenberg 2012-03-07 13:39:50 +01:00 committed by Wim Taymans
parent b4756db358
commit 38372eb199
1 changed files with 44 additions and 15 deletions
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49
ext/libpng/gstpngdec.c
View file

@ -87,7 +87,8 @@ static GstStaticPadTemplate gst_pngdec_src_pad_template =
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_RGBA ";" GST_VIDEO_CAPS_RGB ";"
GST_VIDEO_CAPS_ARGB_64)
GST_VIDEO_CAPS_ARGB_64 ";"
GST_VIDEO_CAPS_GRAY8 ";" GST_VIDEO_CAPS_GRAY16 ("BIG_ENDIAN"))
);
static GstStaticPadTemplate gst_pngdec_sink_pad_template =
@ -371,15 +372,15 @@ gst_pngdec_caps_create_and_set (GstPngDec * pngdec)
/* Get bits per channel */
bpc = png_get_bit_depth (pngdec->png, pngdec->info);
if (bpc > 8) {
/* Add alpha channel if 16-bit depth */
png_set_add_alpha (pngdec->png, 0xffff, PNG_FILLER_BEFORE);
png_set_swap (pngdec->png);
}
/* Get Color type */
color_type = png_get_color_type (pngdec->png, pngdec->info);
/* Add alpha channel if 16-bit depth, but not for GRAY images */
if ((bpc > 8) && (color_type != PNG_COLOR_TYPE_GRAY)) {
png_set_add_alpha (pngdec->png, 0xffff, PNG_FILLER_BEFORE);
png_set_swap (pngdec->png);
}
#if 0
/* We used to have this HACK to reverse the outgoing bytes, but the problem
* that originally required the hack seems to have been in ffmpegcolorspace's
@ -389,11 +390,16 @@ gst_pngdec_caps_create_and_set (GstPngDec * pngdec)
png_set_bgr (pngdec->png);
#endif
/* Gray scale converted to RGB and upscaled to 8 bits */
/* Gray scale with alpha channel converted to RGB */
if (color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
GST_LOG_OBJECT (pngdec,
"converting grayscale png with alpha channel to RGB");
png_set_gray_to_rgb (pngdec->png);
}
/* Gray scale converted to upscaled to 8 bits */
if ((color_type == PNG_COLOR_TYPE_GRAY_ALPHA) ||
(color_type == PNG_COLOR_TYPE_GRAY)) {
GST_LOG_OBJECT (pngdec, "converting grayscale png to RGB");
png_set_gray_to_rgb (pngdec->png);
if (bpc < 8) { /* Convert to 8 bits */
GST_LOG_OBJECT (pngdec, "converting grayscale image to 8 bits");
#if PNG_LIBPNG_VER < 10400
@ -430,9 +436,15 @@ gst_pngdec_caps_create_and_set (GstPngDec * pngdec)
pngdec->bpp = 3 * bpc;
break;
case PNG_COLOR_TYPE_RGB_ALPHA:
GST_LOG_OBJECT (pngdec, "we have an alpha channel, depth is 32 bits");
GST_LOG_OBJECT (pngdec,
"we have an alpha channel, depth is 32 or 64 bits");
pngdec->bpp = 4 * bpc;
break;
case PNG_COLOR_TYPE_GRAY:
GST_LOG_OBJECT (pngdec,
"We have an gray image, depth is 8 or 16 (be) bits");
pngdec->bpp = bpc;
break;
default:
GST_ELEMENT_ERROR (pngdec, STREAM, NOT_IMPLEMENTED, (NULL),
("pngdec does not support this color type"));
@ -440,11 +452,28 @@ gst_pngdec_caps_create_and_set (GstPngDec * pngdec)
goto beach;
}
if (pngdec->color_type == PNG_COLOR_TYPE_GRAY) {
if (pngdec->bpp < 16) {
caps = gst_caps_new_simple ("video/x-raw-gray",
"width", G_TYPE_INT, pngdec->width,
"height", G_TYPE_INT, pngdec->height,
"bpp", G_TYPE_INT, pngdec->bpp,
"framerate", GST_TYPE_FRACTION, pngdec->fps_n, pngdec->fps_d, NULL);
} else {
caps = gst_caps_new_simple ("video/x-raw-gray",
"width", G_TYPE_INT, pngdec->width,
"height", G_TYPE_INT, pngdec->height,
"bpp", G_TYPE_INT, pngdec->bpp,
"endianness", G_TYPE_INT, G_BIG_ENDIAN,
"framerate", GST_TYPE_FRACTION, pngdec->fps_n, pngdec->fps_d, NULL);
}
} else {
caps = gst_caps_new_simple ("video/x-raw-rgb",
"width", G_TYPE_INT, pngdec->width,
"height", G_TYPE_INT, pngdec->height,
"bpp", G_TYPE_INT, pngdec->bpp,
"framerate", GST_TYPE_FRACTION, pngdec->fps_n, pngdec->fps_d, NULL);
}
templ = gst_static_pad_template_get (&gst_pngdec_src_pad_template);