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pngdec: Handle 16-bit-per-channel images

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This commit is contained in:
David Schleef 2011-02-19 15:48:22 -08:00
parent 367adf2b69
commit 13d441315f
1 changed files with 15 additions and 10 deletions
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25
ext/libpng/gstpngdec.c
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@ -82,11 +82,18 @@ gst_pngdec_get_type (void)
return pngdec_type; return pngdec_type;
} }
/* FIXME remove this after -good depends on -base-0.10.33 */
#ifdef GST_VIDEO_CAPS_ARGB_64
#define CAPS GST_VIDEO_CAPS_RGBA ";" GST_VIDEO_CAPS_RGB ";" GST_VIDEO_CAPS_ARGB_64
#else
#define CAPS GST_VIDEO_CAPS_RGBA ";" GST_VIDEO_CAPS_RGB
#endif
static GstStaticPadTemplate gst_pngdec_src_pad_template = static GstStaticPadTemplate gst_pngdec_src_pad_template =
GST_STATIC_PAD_TEMPLATE ("src", GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC, GST_PAD_SRC,
GST_PAD_ALWAYS, GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_RGBA ";" GST_VIDEO_CAPS_RGB) GST_STATIC_CAPS (CAPS)
); );
static GstStaticPadTemplate gst_pngdec_sink_pad_template = static GstStaticPadTemplate gst_pngdec_sink_pad_template =
@ -370,12 +377,10 @@ gst_pngdec_caps_create_and_set (GstPngDec * pngdec)
/* Get bits per channel */ /* Get bits per channel */
bpc = png_get_bit_depth (pngdec->png, pngdec->info); bpc = png_get_bit_depth (pngdec->png, pngdec->info);
if (bpc > 8) {
/* We don't handle 16 bits per color, strip down to 8 */ /* Add alpha channel if 16-bit depth */
if (bpc == 16) { png_set_add_alpha (pngdec->png, 0xffff, PNG_FILLER_BEFORE);
GST_LOG_OBJECT (pngdec, png_set_swap (pngdec->png);
"this is a 16 bits per channel PNG image, strip down to 8 bits");
png_set_strip_16 (pngdec->png);
} }
/* Get Color type */ /* Get Color type */
@ -428,11 +433,11 @@ gst_pngdec_caps_create_and_set (GstPngDec * pngdec)
switch (pngdec->color_type) { switch (pngdec->color_type) {
case PNG_COLOR_TYPE_RGB: case PNG_COLOR_TYPE_RGB:
GST_LOG_OBJECT (pngdec, "we have no alpha channel, depth is 24 bits"); GST_LOG_OBJECT (pngdec, "we have no alpha channel, depth is 24 bits");
pngdec->bpp = 24; pngdec->bpp = 3 * bpc;
break; break;
case PNG_COLOR_TYPE_RGB_ALPHA: 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 bits");
pngdec->bpp = 32; pngdec->bpp = 4 * bpc;
break; break;
default: default:
GST_ELEMENT_ERROR (pngdec, STREAM, NOT_IMPLEMENTED, (NULL), GST_ELEMENT_ERROR (pngdec, STREAM, NOT_IMPLEMENTED, (NULL),