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xxan: properly handle odd heights.

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Duplicate the last one or two chroma lines.

Signed-off-by: Anton Khirnov <anton@khirnov.net>
CC:libav-stable@libav.org
This commit is contained in:
Kostya Shishkov 2013-01-29 19:53:04 +01:00 committed by Anton Khirnov
parent 2cd4068071
commit 685e6f2e39
2 changed files with 36 additions and 21 deletions
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15
libavcodec/xxan.c
View File

@ -45,6 +45,11 @@ static av_cold int xan_decode_init(AVCodecContext *avctx)
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
if (avctx->height < 8) {
av_log(avctx, AV_LOG_ERROR, "Invalid frame height: %d.\n", avctx->height);
return AVERROR(EINVAL);
}
s->buffer_size = avctx->width * avctx->height;
s->y_buffer = av_malloc(s->buffer_size);
if (!s->y_buffer)
@ -210,6 +215,10 @@ static int xan_decode_chroma(AVCodecContext *avctx, unsigned chroma_off)
U += s->pic.linesize[1];
V += s->pic.linesize[2];
}
if (avctx->height & 1) {
memcpy(U, U - s->pic.linesize[1], avctx->width >> 1);
memcpy(V, V - s->pic.linesize[2], avctx->width >> 1);
}
} else {
uint8_t *U2 = U + s->pic.linesize[1];
uint8_t *V2 = V + s->pic.linesize[2];
@ -230,6 +239,12 @@ static int xan_decode_chroma(AVCodecContext *avctx, unsigned chroma_off)
U2 += s->pic.linesize[1] * 2;
V2 += s->pic.linesize[2] * 2;
}
if (avctx->height & 3) {
int lines = ((avctx->height + 1) >> 1) - (avctx->height >> 2) * 2;
memcpy(U, U - lines * s->pic.linesize[1], lines * s->pic.linesize[1]);
memcpy(V, V - lines * s->pic.linesize[2], lines * s->pic.linesize[2]);
}
}
return 0;

42
tests/ref/fate/xxan-wc4
View File

@ -1,22 +1,22 @@
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