From 738219c921d6037f8acfcde1c567c3b16fb625fe Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Tue, 6 Sep 2011 13:35:15 +0200 Subject: [PATCH] pngdec: 4bpp support Fixes Ticket208 Signed-off-by: Michael Niedermayer --- libavcodec/pngdec.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c index 70635671c20..0b6a62dc1da 100644 --- a/libavcodec/pngdec.c +++ b/libavcodec/pngdec.c @@ -27,7 +27,7 @@ #include "png.h" /* TODO: - * - add 2, 4 and 16 bit depth support + * - add 2 and 16 bit depth support */ #include @@ -580,6 +580,19 @@ static int decode_frame(AVCodecContext *avctx, } } exit_loop: + + if(s->bits_per_pixel == 4){ + int i, j; + uint8_t *pd = s->current_picture->data[0]; + for(j=0; j < s->height; j++) { + for(i=s->width/2-1; i>=0; i--) { + pd[2*i+1]= pd[i]&15; + pd[2*i+0]= pd[i]>>4; + } + pd += s->image_linesize; + } + } + /* handle p-frames only if a predecessor frame is available */ if(s->last_picture->data[0] != NULL) { if(!(avpkt->flags & AV_PKT_FLAG_KEY)) { -- 2.39.2