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Return error when trying to decode non-grayscale 16-bit PNM images.

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Fixes issue 566.

Originally committed as revision 15321 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles 2008-09-14 15:50:59 +00:00
parent 8840ce92f7
commit 0605f5c86b
1 changed files with 13 additions and 1 deletions
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14
libavcodec/pnm.c
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@ -106,7 +106,13 @@ int ff_pnm_decode_header(AVCodecContext *avctx, PNMContext * const s){
else
avctx->pix_fmt = PIX_FMT_GRAY8;
} else if (depth == 3) {
if (maxval < 256) {
avctx->pix_fmt = PIX_FMT_RGB24;
} else {
av_log(avctx, AV_LOG_ERROR, "16-bit components are only supported for grayscale\n");
avctx->pix_fmt = PIX_FMT_NONE;
return -1;
}
} else if (depth == 4) {
avctx->pix_fmt = PIX_FMT_RGB32;
} else {
@ -127,10 +133,16 @@ int ff_pnm_decode_header(AVCodecContext *avctx, PNMContext * const s){
if (avctx->pix_fmt != PIX_FMT_MONOWHITE) {
pnm_get(s, buf1, sizeof(buf1));
s->maxval = atoi(buf1);
if(s->maxval >= 256 && avctx->pix_fmt == PIX_FMT_GRAY8) {
if (s->maxval >= 256) {
if (avctx->pix_fmt == PIX_FMT_GRAY8) {
avctx->pix_fmt = PIX_FMT_GRAY16BE;
if (s->maxval != 65535)
avctx->pix_fmt = PIX_FMT_GRAY16;
} else {
av_log(avctx, AV_LOG_ERROR, "16-bit components are only supported for grayscale\n");
avctx->pix_fmt = PIX_FMT_NONE;
return -1;
}
}
}
/* more check if YUV420 */