Compression 4 code 0 means copy from delta buffer without mv, AND start of a skip run. This gets rid of the extra case and column index manipulation and implements this as it is implemented in the original game exe, i.e. as a special case for after mv copy.
Showing the changes to libavcodec (1 of 1 file). Show all
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| @@ -1106,16 +1106,17 @@ static int old_codec37(SANMVideoContext *ctx, int width, int height) · 1105 unmodified lines | ||
| 1106 | 1106 | t = bytestream2_get_byteu(&ctx->gb); |
| 1107 | 1107 | for (k = 0; k < 4; k++) |
| 1108 | 1108 | memset(dst + i + k * stride, t, 4); |
| 1109 | − } else if ((compr == 4) && (code == 0)) { | |
| 1110 | − if (bytestream2_get_bytes_left(&ctx->gb) < 1) | |
| 1111 | − return AVERROR_INVALIDDATA; | |
| 1112 | − skip_run = bytestream2_get_byteu(&ctx->gb) + 1; | |
| 1113 | − i -= 4; | |
| 1114 | 1109 | } else { |
| 1115 | 1110 | mx = c37_mv[(mvoff * 255 + code) * 2]; |
| 1116 | 1111 | my = c37_mv[(mvoff * 255 + code) * 2 + 1]; |
| 1117 | 1112 | codec37_mv(dst + i, prev + i + mx + my * stride, |
| 1118 | 1113 | ctx->height, stride, i + mx, j + my); |
| 1114 | + | |
| 1115 | + if ((compr == 4) && (code == 0)) { | |
| 1116 | + if (bytestream2_get_bytes_left(&ctx->gb) < 1) | |
| 1117 | + return AVERROR_INVALIDDATA; | |
| 1118 | + skip_run = bytestream2_get_byteu(&ctx->gb); | |
| 1119 | + } | |
| 1119 | 1120 | } |
| 1120 | 1121 | } |
| 1121 | 1122 | dst += stride * 4; |