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libavcodec/sanm: fix XPAL handling

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Outlaws' RAE.SAN file did not properly fade out in certain scenes,
but simply turned to black as soon as the first XPAL chunk with
the apply command was encountered.

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 09:55:04 +01:00 committed by Anton Khirnov
parent 1e2a72ae1d
commit 85fec8d90f
1 changed files with 41 additions and 28 deletions
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69
libavcodec/sanm.c
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@ -1033,6 +1033,45 @@ static int process_frame_obj(SANMVideoContext *ctx)
} }
} }
static int process_xpal(SANMVideoContext *ctx, int size)
{
int16_t *dp = ctx->delta_pal;
uint32_t *pal = ctx->pal;
uint16_t cmd;
uint8_t c[3];
int i, j;
bytestream2_skip(&ctx->gb, 2);
cmd = bytestream2_get_be16(&ctx->gb);
if (cmd == 1) {
for (i = 0; i < PALETTE_DELTA; i += 3) {
c[0] = (*pal >> 16) & 0xFF;
c[1] = (*pal >> 8) & 0xFF;
c[2] = (*pal >> 0) & 0xFF;
for (j = 0; j < 3; j++) {
int cl = (c[j] * 129) + *dp++;
c[j] = av_clip_uint8(cl / 128) & 0xFF;
}
*pal++ = 0xFFU << 24 | c[0] << 16 | c[1] << 8 | c[2];
}
} else if (cmd == 2) {
if (size < PALETTE_DELTA * 2 + 4) {
av_log(ctx->avctx, AV_LOG_ERROR,
"Incorrect palette change block size %"PRIu32".\n", size);
return AVERROR_INVALIDDATA;
}
for (i = 0; i < PALETTE_DELTA; i++)
dp[i] = bytestream2_get_le16u(&ctx->gb);
if (size >= PALETTE_DELTA * 2 + 4 + PALETTE_SIZE * 3) {
for (i = 0; i < PALETTE_SIZE; i++)
ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);
}
}
return 0;
}
static int decode_0(SANMVideoContext *ctx) static int decode_0(SANMVideoContext *ctx)
{ {
uint16_t *frm = ctx->frm0; uint16_t *frm = ctx->frm0;
@ -1472,34 +1511,8 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
return ret; return ret;
break; break;
case MKBETAG('X', 'P', 'A', 'L'): case MKBETAG('X', 'P', 'A', 'L'):
if (size == 6 || size == 4) { if (ret = process_xpal(ctx, size))
uint8_t tmp[3]; return ret;
int j;
for (i = 0; i < PALETTE_SIZE; i++) {
for (j = 0; j < 3; j++) {
int t = (ctx->pal[i] >> (16 - j * 8)) & 0xFF;
tmp[j] = av_clip_uint8((t * 129 + ctx->delta_pal[i * 3 + j]) >> 7);
}
ctx->pal[i] = 0xFFU << 24 | AV_RB24(tmp);
}
} else {
if (size < PALETTE_DELTA * 2 + 4) {
av_log(avctx, AV_LOG_ERROR,
"Incorrect palette change block size %"PRIu32".\n",
size);
return AVERROR_INVALIDDATA;
}
bytestream2_skipu(&ctx->gb, 4);
for (i = 0; i < PALETTE_DELTA; i++)
ctx->delta_pal[i] = bytestream2_get_le16u(&ctx->gb);
if (size >= PALETTE_DELTA * 5 + 4) {
for (i = 0; i < PALETTE_SIZE; i++)
ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);
} else {
memset(ctx->pal, 0, sizeof(ctx->pal));
}
}
break; break;
case MKBETAG('S', 'T', 'O', 'R'): case MKBETAG('S', 'T', 'O', 'R'):
to_store = 1; to_store = 1;