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Code Issues Releases Activity

avcodec/tscc2: Make VLC tables static

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Also use a named constant for the number of bits of the VLC tables.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-11-03 20:11:18 +01:00
parent b629deab3d
commit 4df5144102
1 changed files with 32 additions and 41 deletions
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73
libavcodec/tscc2.c
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@ -26,6 +26,8 @@
#include <inttypes.h>
#include "libavutil/thread.h"
#define BITSTREAM_READER_LE
#include "avcodec.h"
#include "bytestream.h"
@ -34,6 +36,8 @@
#include "mathops.h"
#include "tscc2data.h"
#define TSCC2_VLC_BITS 9
typedef struct TSCC2Context {
AVCodecContext *avctx;
AVFrame *pic;
@ -43,52 +47,43 @@ typedef struct TSCC2Context {
int q[2][3];
GetBitContext gb;
VLC dc_vlc, nc_vlc[NUM_VLC_SETS], ac_vlc[NUM_VLC_SETS];
int block[16];
} TSCC2Context;
static av_cold void free_vlcs(TSCC2Context *c)
{
int i;
static VLC dc_vlc, nc_vlc[NUM_VLC_SETS], ac_vlc[NUM_VLC_SETS];
ff_free_vlc(&c->dc_vlc);
for (i = 0; i < NUM_VLC_SETS; i++) {
ff_free_vlc(c->nc_vlc + i);
ff_free_vlc(c->ac_vlc + i);
}
static av_cold void tscc2_init_vlc(VLC *vlc, int *offset, int nb_codes,
const uint8_t *lens, const void *syms,
int sym_length)
{
static VLC_TYPE vlc_buf[15442][2];
vlc->table = &vlc_buf[*offset];
vlc->table_allocated = FF_ARRAY_ELEMS(vlc_buf) - *offset;
ff_init_vlc_from_lengths(vlc, TSCC2_VLC_BITS, nb_codes,
lens, 1, syms, sym_length, sym_length, 0,
INIT_VLC_STATIC_OVERLONG | INIT_VLC_OUTPUT_LE, NULL);
*offset += vlc->table_size;
}
static av_cold int init_vlcs(TSCC2Context *c)
static av_cold void tscc2_init_vlcs(void)
{
const uint16_t *ac_vlc_syms = tscc2_ac_vlc_syms;
const uint8_t *ac_vlc_lens = tscc2_ac_vlc_lens;
int i, ret;
int i, offset = 0;
ret = ff_init_vlc_from_lengths(&c->dc_vlc, 9, DC_VLC_COUNT,
tscc2_dc_vlc_lens, 1,
tscc2_dc_vlc_syms, 2, 2,
0, INIT_VLC_OUTPUT_LE, c->avctx);
if (ret)
return ret;
tscc2_init_vlc(&dc_vlc, &offset, DC_VLC_COUNT,
tscc2_dc_vlc_lens, tscc2_dc_vlc_syms, 2);
for (i = 0; i < NUM_VLC_SETS; i++) {
ret = ff_init_vlc_from_lengths(c->nc_vlc + i, 9, 16,
tscc2_nc_vlc_lens[i], 1,
tscc2_nc_vlc_syms[i], 1, 1,
0, INIT_VLC_OUTPUT_LE, c->avctx);
if (ret)
return ret;
ret = ff_init_vlc_from_lengths(c->ac_vlc + i, 9, tscc2_ac_vlc_sizes[i],
ac_vlc_lens, 1,
ac_vlc_syms, 2, 2,
0, INIT_VLC_OUTPUT_LE, c->avctx);
if (ret)
return ret;
tscc2_init_vlc(&nc_vlc[i], &offset, 16,
tscc2_nc_vlc_lens[i], tscc2_nc_vlc_syms[i], 1);
tscc2_init_vlc(&ac_vlc[i], &offset, tscc2_ac_vlc_sizes[i],
ac_vlc_lens, ac_vlc_syms, 2);
ac_vlc_lens += tscc2_ac_vlc_sizes[i];
ac_vlc_syms += tscc2_ac_vlc_sizes[i];
}
return 0;
}
#define DEQUANT(val, q) (((q) * (val) + 0x80) >> 8)
@ -154,7 +149,7 @@ static int tscc2_decode_mb(TSCC2Context *c, int *q, int vlc_set,
if (!(j | k)) {
dc = get_bits(gb, 8);
} else {
dc = get_vlc2(gb, c->dc_vlc.table, 9, 2);
dc = get_vlc2(gb, dc_vlc.table, TSCC2_VLC_BITS, 2);
if (dc == 0x100)
dc = get_bits(gb, 8);
}
@ -162,12 +157,12 @@ static int tscc2_decode_mb(TSCC2Context *c, int *q, int vlc_set,
prev_dc = dc;
c->block[0] = dc;
nc = get_vlc2(gb, c->nc_vlc[vlc_set].table, 9, 1);
nc = get_vlc2(gb, nc_vlc[vlc_set].table, TSCC2_VLC_BITS, 1);
bpos = 1;
memset(c->block + 1, 0, 15 * sizeof(*c->block));
for (l = 0; l < nc; l++) {
ac = get_vlc2(gb, c->ac_vlc[vlc_set].table, 9, 2);
ac = get_vlc2(gb, ac_vlc[vlc_set].table, TSCC2_VLC_BITS, 2);
if (ac == 0x1000)
ac = get_bits(gb, 12);
bpos += ac & 0xF;
@ -330,7 +325,6 @@ static av_cold int tscc2_decode_end(AVCodecContext *avctx)
av_frame_free(&c->pic);
av_freep(&c->slice_quants);
free_vlcs(c);
return 0;
}
@ -338,17 +332,12 @@ static av_cold int tscc2_decode_end(AVCodecContext *avctx)
static av_cold int tscc2_decode_init(AVCodecContext *avctx)
{
TSCC2Context * const c = avctx->priv_data;
int ret;
static AVOnce init_static_once = AV_ONCE_INIT;
c->avctx = avctx;
avctx->pix_fmt = AV_PIX_FMT_YUV444P;
if ((ret = init_vlcs(c)) < 0) {
av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n");
return ret;
}
c->mb_width = FFALIGN(avctx->width, 16) >> 4;
c->mb_height = FFALIGN(avctx->height, 8) >> 3;
c->slice_quants = av_malloc(c->mb_width * c->mb_height);
@ -361,6 +350,8 @@ static av_cold int tscc2_decode_init(AVCodecContext *avctx)
if (!c->pic)
return AVERROR(ENOMEM);
ff_thread_once(&init_static_once, tscc2_init_vlcs);
return 0;
}