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avcodec/mobiclip: Reduce size of VLCs, inline constants

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The longest motion vector VLC for mobiclip is six bits long, so using
eight bits for the VLC table is wasteful. Furthermore, the length can be
inlined.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-10-24 11:41:37 +02:00
parent 3a836f38f6
commit c4229ad074
1 changed files with 6 additions and 4 deletions
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10
libavcodec/mobiclip.c
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@ -31,6 +31,8 @@
#include "golomb.h"
#include "internal.h"
#define MOBI_MV_VLC_BITS 6
static const uint8_t zigzag4x4_tab[] =
{
0x00, 0x04, 0x01, 0x02, 0x05, 0x08, 0x0C, 0x09, 0x06, 0x03, 0x07, 0x0A,
@ -364,14 +366,14 @@ static av_cold int mobiclip_init(AVCodecContext *avctx)
}
for (int j = 0; j < 16; j++) {
ret = ff_init_vlc_sparse(&s->mv_vlc[0][j], 8, mv_len[j],
ret = ff_init_vlc_sparse(&s->mv_vlc[0][j], MOBI_MV_VLC_BITS, mv_len[j],
mv_bits_mods[j], sizeof(*mv_bits_mods[j]), sizeof(*mv_bits_mods[j]),
mv_codes_mods[j], sizeof(*mv_codes_mods[j]), sizeof(*mv_codes_mods[j]),
mv_syms_mods[j], sizeof(*mv_syms_mods[j]), sizeof(*mv_syms_mods[j]), 0);
if (ret < 0)
return ret;
ret = ff_init_vlc_sparse(&s->mv_vlc[1][j], 8, mv_len[j],
ret = ff_init_vlc_sparse(&s->mv_vlc[1][j], MOBI_MV_VLC_BITS, mv_len[j],
mv_bits[j], sizeof(*mv_bits[j]), sizeof(*mv_bits[j]),
mv_codes[j], sizeof(*mv_codes[j]), sizeof(*mv_codes[j]),
mv_syms[j], sizeof(*mv_syms[j]), sizeof(*mv_syms[j]), 0);
@ -1259,7 +1261,7 @@ static int predict_motion(AVCodecContext *avctx,
int ret, idx2;
idx2 = get_vlc2(gb, s->mv_vlc[s->moflex][tidx].table,
s->mv_vlc[s->moflex][tidx].bits, 1);
MOBI_MV_VLC_BITS, 1);
if (idx2 < 0)
return AVERROR_INVALIDDATA;
@ -1335,7 +1337,7 @@ static int mobiclip_decode(AVCodecContext *avctx, void *data,
motion[x / 16 + 2].y = 0;
idx = get_vlc2(gb, s->mv_vlc[s->moflex][0].table,
s->mv_vlc[s->moflex][0].bits, 1);
MOBI_MV_VLC_BITS, 1);
if (idx < 0)
return AVERROR_INVALIDDATA;