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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
pull/9/head
Kostya Shishkov 12 years ago committed by Anton Khirnov
parent 2cd4068071
commit 685e6f2e39
2 changed files with 36 additions and 21 deletions
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  1. 15
      libavcodec/xxan.c
  2. 42
      tests/ref/fate/xxan-wc4

15
libavcodec/xxan.c
Unescape 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
Unescape View File

@ -1,22 +1,22 @@
#tb 0: 1/15
0, 0, 0, 1, 79360, 0x3b0a7d1b
0, 1, 1, 1, 79360, 0x740842c3
0, 2, 2, 1, 79360, 0x85160167
0, 3, 3, 1, 79360, 0xaf510e92
0, 4, 4, 1, 79360, 0x8e290bec
0, 5, 5, 1, 79360, 0x51e981b0
0, 6, 6, 1, 79360, 0x16e52c60
0, 7, 7, 1, 79360, 0x66e1e60a
0, 8, 8, 1, 79360, 0x40fa58f6
0, 9, 9, 1, 79360, 0x00388edd
0, 10, 10, 1, 79360, 0xc74f95bf
0, 11, 11, 1, 79360, 0xf446a3fd
0, 12, 12, 1, 79360, 0x27b5eb60
0, 13, 13, 1, 79360, 0xea9266a2
0, 14, 14, 1, 79360, 0x7b6a7907
0, 15, 15, 1, 79360, 0x2be7d946
0, 16, 16, 1, 79360, 0x61881ee4
0, 17, 17, 1, 79360, 0x9214bd4f
0, 18, 18, 1, 79360, 0xeb294afe
0, 19, 19, 1, 79360, 0xc861ad55
0, 20, 20, 1, 79360, 0x3d3b6220
0, 0, 0, 1, 79360, 0x8537821b
0, 1, 1, 1, 79360, 0x110c4343
0, 2, 2, 1, 79360, 0xa85105bb
0, 3, 3, 1, 79360, 0x87431836
0, 4, 4, 1, 79360, 0x5c701720
0, 5, 5, 1, 79360, 0x20308ce4
0, 6, 6, 1, 79360, 0xe51d3794
0, 7, 7, 1, 79360, 0x80e6f1e0
0, 8, 8, 1, 79360, 0x5aff64cc
0, 9, 9, 1, 79360, 0x1a3d9ab3
0, 10, 10, 1, 79360, 0xe154a195
0, 11, 11, 1, 79360, 0x608dafdc
0, 12, 12, 1, 79360, 0x93edf73f
0, 13, 13, 1, 79360, 0x56d97281
0, 14, 14, 1, 79360, 0xe7a284e6
0, 15, 15, 1, 79360, 0xd4e5e513
0, 16, 16, 1, 79360, 0x0a952ab1
0, 17, 17, 1, 79360, 0x3b21c91c
0, 18, 18, 1, 79360, 0x943656cb
0, 19, 19, 1, 79360, 0xffbdb94b
0, 20, 20, 1, 79360, 0x74976e16

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