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.
Unified · Split
| @@ -915,13 +915,16 @@ static int old_codec47(SANMVideoContext *ctx, int top, · 914 unmodified lines | ||
| 915 | 915 | uint8_t *dst = (uint8_t *)ctx->frm0 + left + top * stride; |
| 916 | 916 | uint8_t *prev1 = (uint8_t *)ctx->frm1; |
| 917 | 917 | uint8_t *prev2 = (uint8_t *)ctx->frm2; |
| 918 | + uint8_t auxcol[2]; | |
| 918 | 919 | int tbl_pos = bytestream2_tell(&ctx->gb); |
| 919 | 920 | int seq = bytestream2_get_le16(&ctx->gb); |
| 920 | 921 | int compr = bytestream2_get_byte(&ctx->gb); |
| 921 | 922 | int new_rot = bytestream2_get_byte(&ctx->gb); |
| 922 | 923 | int skip = bytestream2_get_byte(&ctx->gb); |
| 923 | 924 | |
| 924 | − bytestream2_skip(&ctx->gb, 9); | |
| 925 | + bytestream2_skip(&ctx->gb, 7); | |
| 926 | + auxcol[0] = bytestream2_get_byteu(&ctx->gb); | |
| 927 | + auxcol[1] = bytestream2_get_byteu(&ctx->gb); | |
| 925 | 928 | decoded_size = bytestream2_get_le32(&ctx->gb); |
| 926 | 929 | bytestream2_skip(&ctx->gb, 8); |
| 927 | 930 | |
| @@ -937,8 +940,8 @@ static int old_codec47(SANMVideoContext *ctx, int top, · 9 unmodified lines | ||
| 937 | 940 | } |
| 938 | 941 | if (!seq) { |
| 939 | 942 | ctx->prev_seq = -1; |
| 940 | − memset(prev1, 0, ctx->height * stride); | |
| 941 | − memset(prev2, 0, ctx->height * stride); | |
| 943 | + memset(prev1, auxcol[0], ctx->height * stride); | |
| 944 | + memset(prev2, auxcol[1], ctx->height * stride); | |
| 942 | 945 | } |
| 943 | 946 | |
| 944 | 947 | switch (compr) { |