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avcodec/ituh263enc: Simplify encoding umotion vectors

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There is no need to use two loops.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2025-06-14 00:36:31 +02:00
parent 689cde75ee
commit f8c0ac9984
1 changed files with 9 additions and 27 deletions
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36
libavcodec/ituh263enc.c
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@ -573,38 +573,20 @@ static void h263_encode_block(MPVEncContext *const s, int16_t block[], int n)
/* Encode MV differences on H.263+ with Unrestricted MV mode */ /* Encode MV differences on H.263+ with Unrestricted MV mode */
static void h263p_encode_umotion(PutBitContext *pb, int val) static void h263p_encode_umotion(PutBitContext *pb, int val)
{ {
short sval = 0;
short i = 0;
short n_bits = 0;
short temp_val;
int code = 0;
int tcode;
if ( val == 0) if ( val == 0)
put_bits(pb, 1, 1); put_bits(pb, 1, 1);
else if (val == 1)
put_bits(pb, 3, 0);
else if (val == -1)
put_bits(pb, 3, 2);
else { else {
unsigned code = (val < 0) << 1;
unsigned aval = val < 0 ? -val : val;
unsigned n_bits = 2;
sval = ((val < 0) ? (short)(-val):(short)val); while (aval != 1) { // The leading digit is implicitly coded via length
temp_val = sval; unsigned tmp = (aval & 1) << 1 | 1;
aval >>= 1;
while (temp_val != 0) { code |= tmp << n_bits;
temp_val = temp_val >> 1; n_bits += 2;
n_bits++;
} }
put_bits(pb, n_bits + 1, code);
i = n_bits - 1;
while (i > 0) {
tcode = (sval & (1 << (i-1))) >> (i-1);
tcode = (tcode << 1) | 1;
code = (code << 2) | tcode;
i--;
}
code = ((code << 1) | (val < 0)) << 1;
put_bits(pb, (2*n_bits)+1, code);
} }
} }