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avcodec/sanm: codec20 decoder

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codec20 is raw uncompressed image data.

It exists in Rebel Assault 1 as a special format for STOR/FTCH
and is used again in the Full Throttle Remaster from 2017.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
This commit is contained in:
Manuel Lauss
2025-03-17 17:39:44 +01:00
parent fd6bfaab55
commit 950ad969fb
1 changed files with 20 additions and 0 deletions
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20
libavcodec/sanm.c
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@ -947,6 +947,24 @@ static int old_codec2(SANMVideoContext *ctx, GetByteContext *gb, int top,
return 0;
}
static int old_codec20(SANMVideoContext *ctx, int w, int h)
{
uint8_t *dst = (uint8_t *)ctx->frm0;
if (bytestream2_get_bytes_left(&ctx->gb) < w * h)
return AVERROR_INVALIDDATA;
if (w == ctx->pitch) {
bytestream2_get_bufferu(&ctx->gb, dst, w * h);
} else {
for (int i = 0; i < h; i++) {
bytestream2_get_bufferu(&ctx->gb, dst, w);
dst += ctx->pitch;
}
}
return 0;
}
static inline void codec37_mv(uint8_t *dst, const uint8_t *src,
int height, int stride, int x, int y)
{
@ -1667,6 +1685,8 @@ static int process_frame_obj(SANMVideoContext *ctx, GetByteContext *gb)
case 33:
case 34:
return old_codec4(ctx, gb, top, left, w, h, param, parm2, codec);
case 20:
return old_codec20(ctx, w, h);
case 21:
return old_codec21(ctx, gb, top, left, w, h);
case 23: