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avcodec/mpeg4videodec: Make studio VLCs static

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Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-11-04 01:37:39 +01:00
parent 3aa81a634a
commit f1ba4d479e
2 changed files with 34 additions and 54 deletions
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4
libavcodec/mpeg4video.h
View File

@ -115,10 +115,6 @@ typedef struct Mpeg4DecContext {
int cplx_estimation_trash_p;
int cplx_estimation_trash_b;
VLC studio_intra_tab[12];
VLC studio_luma_dc;
VLC studio_chroma_dc;
int rgb;
} Mpeg4DecContext;

84
libavcodec/mpeg4videodec.c
View File

@ -25,6 +25,7 @@
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/thread.h"
#include "error_resilience.h"
#include "hwconfig.h"
#include "idctdsp.h"
@ -53,6 +54,9 @@ static int decode_studio_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb);
static VLC dc_lum, dc_chrom;
static VLC sprite_trajectory;
static VLC mb_type_b_vlc;
static VLC studio_intra_tab[12];
static VLC studio_luma_dc;
static VLC studio_chroma_dc;
static const int mb_type_b_map[4] = {
MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
@ -1820,7 +1824,7 @@ static int mpeg4_decode_studio_block(MpegEncContext *s, int32_t block[64], int n
int cc, dct_dc_size, dct_diff, code, j, idx = 1, group = 0, run = 0,
additional_code_len, sign, mismatch;
VLC *cur_vlc = &ctx->studio_intra_tab[0];
const VLC *cur_vlc = &studio_intra_tab[0];
uint8_t *const scantable = s->intra_scantable.permutated;
const uint16_t *quant_matrix;
uint32_t flc;
@ -1834,14 +1838,14 @@ static int mpeg4_decode_studio_block(MpegEncContext *s, int32_t block[64], int n
if (n < 4) {
cc = 0;
dct_dc_size = get_vlc2(&s->gb, ctx->studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
dct_dc_size = get_vlc2(&s->gb, studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
quant_matrix = s->intra_matrix;
} else {
cc = (n & 1) + 1;
if (ctx->rgb)
dct_dc_size = get_vlc2(&s->gb, ctx->studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
dct_dc_size = get_vlc2(&s->gb, studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
else
dct_dc_size = get_vlc2(&s->gb, ctx->studio_chroma_dc.table, STUDIO_INTRA_BITS, 2);
dct_dc_size = get_vlc2(&s->gb, studio_chroma_dc.table, STUDIO_INTRA_BITS, 2);
quant_matrix = s->chroma_intra_matrix;
}
@ -1878,7 +1882,7 @@ static int mpeg4_decode_studio_block(MpegEncContext *s, int32_t block[64], int n
}
additional_code_len = ac_state_tab[group][0];
cur_vlc = &ctx->studio_intra_tab[ac_state_tab[group][1]];
cur_vlc = &studio_intra_tab[ac_state_tab[group][1]];
if (group == 0) {
/* End of Block */
@ -3501,40 +3505,36 @@ static int mpeg4_update_thread_context(AVCodecContext *dst,
}
#endif
static av_cold int init_studio_vlcs(Mpeg4DecContext *ctx)
static av_cold void mpeg4_init_static(void)
{
int i, ret;
INIT_VLC_STATIC_FROM_LENGTHS(&studio_luma_dc, STUDIO_INTRA_BITS, 19,
&ff_mpeg4_studio_dc_luma[0][1], 2,
&ff_mpeg4_studio_dc_luma[0][0], 2, 1,
0, 0, 528);
for (i = 0; i < 12; i++) {
ret = ff_init_vlc_from_lengths(&ctx->studio_intra_tab[i],
STUDIO_INTRA_BITS, 24,
&ff_mpeg4_studio_intra[i][0][1], 2,
&ff_mpeg4_studio_intra[i][0][0], 2, 1,
0, 0, NULL);
INIT_VLC_STATIC_FROM_LENGTHS(&studio_chroma_dc, STUDIO_INTRA_BITS, 19,
&ff_mpeg4_studio_dc_chroma[0][1], 2,
&ff_mpeg4_studio_dc_chroma[0][0], 2, 1,
0, 0, 528);
if (ret < 0)
return ret;
for (unsigned i = 0, offset = 0; i < 12; i++) {
static VLC_TYPE vlc_buf[6498][2];
studio_intra_tab[i].table = &vlc_buf[offset];
studio_intra_tab[i].table_allocated = FF_ARRAY_ELEMS(vlc_buf) - offset;
ff_init_vlc_from_lengths(&studio_intra_tab[i],
STUDIO_INTRA_BITS, 24,
&ff_mpeg4_studio_intra[i][0][1], 2,
&ff_mpeg4_studio_intra[i][0][0], 2, 1,
0, INIT_VLC_STATIC_OVERLONG, NULL);
offset += studio_intra_tab[i].table_size;
}
ret = ff_init_vlc_from_lengths(&ctx->studio_luma_dc, STUDIO_INTRA_BITS, 19,
&ff_mpeg4_studio_dc_luma[0][1], 2,
&ff_mpeg4_studio_dc_luma[0][0], 2, 1,
0, 0, NULL);
if (ret < 0)
return ret;
ret = ff_init_vlc_from_lengths(&ctx->studio_chroma_dc, STUDIO_INTRA_BITS, 19,
&ff_mpeg4_studio_dc_chroma[0][1], 2,
&ff_mpeg4_studio_dc_chroma[0][0], 2, 1,
0, 0, NULL);
if (ret < 0)
return ret;
return 0;
ff_mpeg4videodec_static_init();
}
static av_cold int decode_init(AVCodecContext *avctx)
{
static AVOnce init_static_once = AV_ONCE_INIT;
Mpeg4DecContext *ctx = avctx->priv_data;
MpegEncContext *s = &ctx->m;
int ret;
@ -3547,10 +3547,6 @@ static av_cold int decode_init(AVCodecContext *avctx)
if ((ret = ff_h263_decode_init(avctx)) < 0)
return ret;
ff_mpeg4videodec_static_init();
if ((ret = init_studio_vlcs(ctx)) < 0)
return ret;
s->h263_pred = 1;
s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
s->decode_mb = mpeg4_decode_mb;
@ -3558,23 +3554,11 @@ static av_cold int decode_init(AVCodecContext *avctx)
avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
ff_thread_once(&init_static_once, mpeg4_init_static);
return 0;
}
static av_cold int decode_end(AVCodecContext *avctx)
{
Mpeg4DecContext *ctx = avctx->priv_data;
int i;
for (i = 0; i < 12; i++)
ff_free_vlc(&ctx->studio_intra_tab[i]);
ff_free_vlc(&ctx->studio_luma_dc);
ff_free_vlc(&ctx->studio_chroma_dc);
return ff_h263_decode_end(avctx);
}
static const AVOption mpeg4_options[] = {
{"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
{"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
@ -3595,7 +3579,7 @@ AVCodec ff_mpeg4_decoder = {
.id = AV_CODEC_ID_MPEG4,
.priv_data_size = sizeof(Mpeg4DecContext),
.init = decode_init,
.close = decode_end,
.close = ff_h263_decode_end,
.decode = ff_h263_decode_frame,
.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |