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libavcodec/sanm: clear codec47 diff buffers with specific color

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The codec47 header provides colors to use to clear the
2 difference buffers. This fixes artifacts (black hair, faces) in
Curse of Monkey Island "CURSERNG.SAN" video.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Manuel Lauss 2024-11-08 12:51:14 +01:00 committed by Anton Khirnov
parent 85fec8d90f
commit dc98e7989d
1 changed files with 6 additions and 3 deletions
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9
libavcodec/sanm.c
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@ -915,13 +915,16 @@ static int old_codec47(SANMVideoContext *ctx, int top,
uint8_t *dst = (uint8_t *)ctx->frm0 + left + top * stride;
uint8_t *prev1 = (uint8_t *)ctx->frm1;
uint8_t *prev2 = (uint8_t *)ctx->frm2;
uint8_t auxcol[2];
int tbl_pos = bytestream2_tell(&ctx->gb);
int seq = bytestream2_get_le16(&ctx->gb);
int compr = bytestream2_get_byte(&ctx->gb);
int new_rot = bytestream2_get_byte(&ctx->gb);
int skip = bytestream2_get_byte(&ctx->gb);
bytestream2_skip(&ctx->gb, 9);
bytestream2_skip(&ctx->gb, 7);
auxcol[0] = bytestream2_get_byteu(&ctx->gb);
auxcol[1] = bytestream2_get_byteu(&ctx->gb);
decoded_size = bytestream2_get_le32(&ctx->gb);
bytestream2_skip(&ctx->gb, 8);
@ -937,8 +940,8 @@ static int old_codec47(SANMVideoContext *ctx, int top,
}
if (!seq) {
ctx->prev_seq = -1;
memset(prev1, 0, ctx->height * stride);
memset(prev2, 0, ctx->height * stride);
memset(prev1, auxcol[0], ctx->height * stride);
memset(prev2, auxcol[1], ctx->height * stride);
}
switch (compr) {