RLE-compressed stream of motion vector indices and a special opcode
to fill a block with data from the source stream.
It is used in the LucasArts "Full Throttle" blink*.san animations.
Signed-off-by: Manuel Lauss <manuel.la...@gmail.com>
---
v2: move variable declarations to top of functions.
libavcodec/sanm.c | 65 ++++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 62 insertions(+), 3 deletions(-)
diff --git a/libavcodec/sanm.c b/libavcodec/sanm.c
index a278ef24b1..0d04b09c8d 100644
--- a/libavcodec/sanm.c
+++ b/libavcodec/sanm.c
@@ -624,8 +624,8 @@ static inline void codec37_mv(uint8_t *dst, const uint8_t
*src,
static int old_codec37(SANMVideoContext *ctx, int top,
int left, int width, int height)
{
+ int i, j, k, l, t, run, len, code, skip, mx, my;
ptrdiff_t stride = ctx->pitch;
- int i, j, k, t;
uint8_t *dst, *prev;
int skip_run = 0;
int compr = bytestream2_get_byte(&ctx->gb);
@@ -665,6 +665,67 @@ static int old_codec37(SANMVideoContext *ctx, int top,
memset(ctx->frm1, 0, ctx->height * stride);
memset(ctx->frm2, 0, ctx->height * stride);
break;
+ case 1:
+ run = 0;
+ len = -1;
+ code = 0;
+
+ for (j = 0; j < height; j += 4) {
+ for (i = 0; i < width; i += 4) {
+ if (len < 0) {
+ if (bytestream2_get_bytes_left(&ctx->gb) < 1)
+ return AVERROR_INVALIDDATA;
+ code = bytestream2_get_byte(&ctx->gb);
+ len = code >> 1;
+ run = code & 1;
+ skip = 0;
+ } else {
+ skip = run;
+ }
+
+ if (!skip) {
+ if (bytestream2_get_bytes_left(&ctx->gb) < 1)
+ return AVERROR_INVALIDDATA;
+ code = bytestream2_get_byte(&ctx->gb);
+ if (code == 0xff) {
+ len--;
+ for (k = 0; k < 4; k++) {
+ for (l = 0; l < 4; l++) {
+ if (len < 0) {
+ if (bytestream2_get_bytes_left(&ctx->gb) <
1)
+ return AVERROR_INVALIDDATA;
+ code = bytestream2_get_byte(&ctx->gb);
+ len = code >> 1;
+ run = code & 1;
+ if (run) {
+ if
(bytestream2_get_bytes_left(&ctx->gb) < 1)
+ return AVERROR_INVALIDDATA;
+ code = bytestream2_get_byte(&ctx->gb);
+ }
+ }
+ if (!run) {
+ if (bytestream2_get_bytes_left(&ctx->gb) <
1)
+ return AVERROR_INVALIDDATA;
+ code = bytestream2_get_byte(&ctx->gb);
+ }
+ *(dst + i + (k * stride) + l) = code;
+ len--;
+ }
+ }
+ continue;
+ }
+ }
+ /* 4x4 block copy from prev with MV */
+ mx = c37_mv[(mvoff * 255 + code) * 2];
+ my = c37_mv[(mvoff * 255 + code) * 2 + 1];
+ codec37_mv(dst + i, prev + i + mx + my * stride,
+ ctx->height, stride, i + mx, j + my);
+ len--;
+ }
+ dst += stride * 4;
+ prev += stride * 4;
+ }
+ break;
case 2:
if (rle_decode(ctx, dst, decoded_size))
return AVERROR_INVALIDDATA;
@@ -712,8 +773,6 @@ static int old_codec37(SANMVideoContext *ctx, int top,
skip_run = bytestream2_get_byteu(&ctx->gb) + 1;
i -= 4;
} else {
- int mx, my;
-
mx = c37_mv[(mvoff * 255 + code) * 2];
my = c37_mv[(mvoff * 255 + code) * 2 + 1];
codec37_mv(dst + i, prev + i + mx + my * stride,
--
2.47.1
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