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lavc/sheervideo: Fix Y prediction for interlaced frames with transparency. 

Based on 260de8a2 by Paul B Mahol.
Fixes ticket #6210.
This commit is contained in:
Carl Eugen Hoyos 2017-03-01 23:45:10 +01:00
parent d1bfd19ad1
commit 46082c2b3f
1 changed files with 4 additions and 2 deletions
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6
libavcodec/sheervideo.c
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@ -2185,7 +2185,7 @@ static void decode_aybri(AVCodecContext *avctx, AVFrame *p, GetBitContext *gb)
dst_v[x] = get_bits(gb, 8);
}
} else {
int pred[4] = { 125, 125, -128, -128 };
int pred[4] = { 125, s->alt ? 125 : -146, -128, -128 };
for (x = 0; x < avctx->width; x++) {
int a, y, u, v;
@ -2263,7 +2263,7 @@ static void decode_aybr(AVCodecContext *avctx, AVFrame *p, GetBitContext *gb)
dst_v[x] = get_bits(gb, 8);
}
} else {
int pred[4] = { 125, 125, -128, -128 };
int pred[4] = { 125, s->alt ? 125 : -146, -128, -128 };
for (x = 0; x < avctx->width; x++) {
int a, y, u, v;
@ -2959,6 +2959,7 @@ static int decode_frame(AVCodecContext *avctx,
}
break;
case MKTAG('A', 'Y', 'B', 'R'):
s->alt = 1;
case MKTAG('A', 'Y', 'b', 'R'):
avctx->pix_fmt = AV_PIX_FMT_YUVA444P;
s->decode_frame = decode_aybr;
@ -2968,6 +2969,7 @@ static int decode_frame(AVCodecContext *avctx,
}
break;
case MKTAG('A', 'y', 'B', 'R'):
s->alt = 1;
case MKTAG('A', 'y', 'b', 'R'):
avctx->pix_fmt = AV_PIX_FMT_YUVA444P;
s->decode_frame = decode_aybri;