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FFmpeg/libavcodec/ylc.c
Anton Khirnov 1f4cf92cfb pthread_frame: merge the functionality for normal decoder init and init_thread_copy 
The current design, where
- proper init is called for the first per-thread context
- first thread's private data is copied into private data for all the
  other threads
- a "fixup" function is called for all the other threads to e.g.
  allocate dynamically allocated data
is very fragile and hard to follow, so it is abandoned. Instead, the
same init function is used to init each per-thread context. Where
necessary, AVCodecInternal.is_copy can be used to differentiate between
the first thread and the other ones (e.g. for decoding the extradata
just once).
2020-04-10 15:24:54 +02:00

484 lines
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/*
* YUY2 Lossless Codec
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem.h"
#include "avcodec.h"
#include "bswapdsp.h"
#include "get_bits.h"
#include "huffyuvdsp.h"
#include "internal.h"
#include "thread.h"
#include "unary.h"
typedef struct YLCContext {
VLC vlc[4];
uint32_t table[1024];
uint8_t *table_bits;
uint8_t *bitstream_bits;
int table_bits_size;
int bitstream_bits_size;
BswapDSPContext bdsp;
} YLCContext;
static av_cold int decode_init(AVCodecContext *avctx)
{
YLCContext *s = avctx->priv_data;
avctx->pix_fmt = AV_PIX_FMT_YUYV422;
ff_bswapdsp_init(&s->bdsp);
return 0;
}
typedef struct Node {
int16_t sym;
int16_t n0;
uint32_t count;
int16_t l, r;
} Node;
static void get_tree_codes(uint32_t *bits, int16_t *lens, uint8_t *xlat,
Node *nodes, int node,
uint32_t pfx, int pl, int *pos)
{
int s;
s = nodes[node].sym;
if (s != -1) {
bits[*pos] = (~pfx) & ((1ULL << FFMAX(pl, 1)) - 1);
lens[*pos] = FFMAX(pl, 1);
xlat[*pos] = s + (pl == 0);
(*pos)++;
} else {
pfx <<= 1;
pl++;
get_tree_codes(bits, lens, xlat, nodes, nodes[node].l, pfx, pl,
pos);
pfx |= 1;
get_tree_codes(bits, lens, xlat, nodes, nodes[node].r, pfx, pl,
pos);
}
}
static int build_vlc(AVCodecContext *avctx, VLC *vlc, const uint32_t *table)
{
Node nodes[512];
uint32_t bits[256];
int16_t lens[256];
uint8_t xlat[256];
int cur_node, i, j, pos = 0;
ff_free_vlc(vlc);
for (i = 0; i < 256; i++) {
nodes[i].count = table[i];
nodes[i].sym = i;
nodes[i].n0 = -2;
nodes[i].l = i;
nodes[i].r = i;
}
cur_node = 256;
j = 0;
do {
for (i = 0; ; i++) {
int new_node = j;
int first_node = cur_node;
int second_node = cur_node;
unsigned nd, st;
nodes[cur_node].count = -1;
do {
int val = nodes[new_node].count;
if (val && (val < nodes[first_node].count)) {
if (val >= nodes[second_node].count) {
first_node = new_node;
} else {
first_node = second_node;
second_node = new_node;
}
}
new_node += 1;
} while (new_node != cur_node);
if (first_node == cur_node)
break;
nd = nodes[second_node].count;
st = nodes[first_node].count;
nodes[second_node].count = 0;
nodes[first_node].count = 0;
if (nd >= UINT32_MAX - st) {
av_log(avctx, AV_LOG_ERROR, "count overflow\n");
return AVERROR_INVALIDDATA;
}
nodes[cur_node].count = nd + st;
nodes[cur_node].sym = -1;
nodes[cur_node].n0 = cur_node;
nodes[cur_node].l = first_node;
nodes[cur_node].r = second_node;
cur_node++;
}
j++;
} while (cur_node - 256 == j);
get_tree_codes(bits, lens, xlat, nodes, cur_node - 1, 0, 0, &pos);
return ff_init_vlc_sparse(vlc, 10, pos, lens, 2, 2, bits, 4, 4, xlat, 1, 1, 0);
}
static const uint8_t table_y1[] = {
0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFE,
0xFE, 0xFE, 0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x02,
0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
0x02, 0x00,
};
static const uint8_t table_u[] = {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x00,
};
static const uint8_t table_y2[] = {
0xFC, 0xFC, 0xFC, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE,
0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0xFC,
0xFC, 0xFC, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE, 0xFE,
0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0xFC, 0xFC,
0xFC, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE, 0xFE, 0xFF,
0xFF, 0xFF, 0x00, 0x00, 0x00, 0xFD, 0xFD, 0xFD,
0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00,
0x00, 0x01, 0x01, 0x01, 0xFD, 0xFD, 0xFD, 0xFE,
0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00,
0x01, 0x01, 0x01, 0xFD, 0xFD, 0xFD, 0xFE, 0xFE,
0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x01,
0x01, 0x01, 0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF,
0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x02, 0x02,
0x02, 0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00,
0x00, 0x00, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02,
0xFE, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0x00, 0x00,
0x00, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0xFF,
0xFF, 0xFF, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
0x02, 0x02, 0x02, 0x03, 0x03, 0x03, 0xFF, 0xFF,
0xFF, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x02,
0x02, 0x02, 0x03, 0x03, 0x03, 0xFF, 0xFF, 0xFF,
0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x02, 0x02,
0x02, 0x03, 0x03, 0x03, 0x00, 0x00, 0x00, 0x01,
0x01, 0x01, 0x02, 0x02, 0x02, 0x03, 0x03, 0x03,
0x04, 0x04, 0x04, 0x00, 0x00, 0x00, 0x01, 0x01,
0x01, 0x02, 0x02, 0x02, 0x03, 0x03, 0x03, 0x04,
0x04, 0x04, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
0x02, 0x02, 0x02, 0x03, 0x03, 0x03, 0x04, 0x04,
0x04, 0x00,
};
static const uint8_t table_v[] = {
0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF,
0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01,
0xFF, 0x00, 0x01, 0xFF, 0x00, 0x01, 0xFF, 0x00,
0x01, 0x00,
};
static int decode_frame(AVCodecContext *avctx,
void *data, int *got_frame,
AVPacket *avpkt)
{
int TL[4] = { 128, 128, 128, 128 };
int L[4] = { 128, 128, 128, 128 };
YLCContext *s = avctx->priv_data;
ThreadFrame frame = { .f = data };
const uint8_t *buf = avpkt->data;
int ret, x, y, toffset, boffset;
AVFrame * const p = data;
GetBitContext gb;
uint8_t *dst;
if (avpkt->size <= 16)
return AVERROR_INVALIDDATA;
if (AV_RL32(buf) != MKTAG('Y', 'L', 'C', '0') ||
AV_RL32(buf + 4) != 0)
return AVERROR_INVALIDDATA;
toffset = AV_RL32(buf + 8);
if (toffset < 16 || toffset >= avpkt->size)
return AVERROR_INVALIDDATA;
boffset = AV_RL32(buf + 12);
if (toffset >= boffset || boffset >= avpkt->size)
return AVERROR_INVALIDDATA;
if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
return ret;
av_fast_malloc(&s->table_bits, &s->table_bits_size,
boffset - toffset + AV_INPUT_BUFFER_PADDING_SIZE);
if (!s->table_bits)
return AVERROR(ENOMEM);
memcpy(s->table_bits, avpkt->data + toffset, boffset - toffset);
memset(s->table_bits + boffset - toffset, 0, AV_INPUT_BUFFER_PADDING_SIZE);
s->bdsp.bswap_buf((uint32_t *) s->table_bits,
(uint32_t *) s->table_bits,
(boffset - toffset + 3) >> 2);
if ((ret = init_get_bits8(&gb, s->table_bits, boffset - toffset)) < 0)
return ret;
for (x = 0; x < 1024; x++) {
unsigned len = get_unary(&gb, 1, 31);
uint32_t val = ((1U << len) - 1) + get_bits_long(&gb, len);
s->table[x] = val;
}
ret = build_vlc(avctx, &s->vlc[0], &s->table[0 ]);
if (ret < 0)
return ret;
ret = build_vlc(avctx, &s->vlc[1], &s->table[256]);
if (ret < 0)
return ret;
ret = build_vlc(avctx, &s->vlc[2], &s->table[512]);
if (ret < 0)
return ret;
ret = build_vlc(avctx, &s->vlc[3], &s->table[768]);
if (ret < 0)
return ret;
av_fast_malloc(&s->bitstream_bits, &s->bitstream_bits_size,
avpkt->size - boffset + AV_INPUT_BUFFER_PADDING_SIZE);
if (!s->bitstream_bits)
return AVERROR(ENOMEM);
memcpy(s->bitstream_bits, avpkt->data + boffset, avpkt->size - boffset);
memset(s->bitstream_bits + avpkt->size - boffset, 0, AV_INPUT_BUFFER_PADDING_SIZE);
s->bdsp.bswap_buf((uint32_t *) s->bitstream_bits,
(uint32_t *) s->bitstream_bits,
(avpkt->size - boffset) >> 2);
if ((ret = init_get_bits8(&gb, s->bitstream_bits, avpkt->size - boffset)) < 0)
return ret;
dst = p->data[0];
for (y = 0; y < avctx->height; y++) {
memset(dst, 0, avctx->width * 2);
dst += p->linesize[0];
}
dst = p->data[0];
for (y = 0; y < avctx->height; y++) {
for (x = 0; x < avctx->width * 2 && y < avctx->height;) {
if (get_bits_left(&gb) <= 0)
return AVERROR_INVALIDDATA;
if (get_bits1(&gb)) {
int val = get_vlc2(&gb, s->vlc[0].table, s->vlc[0].bits, 3);
if (val < 0) {
return AVERROR_INVALIDDATA;
} else if (val < 0xE1) {
dst[x ] = table_y1[val];
dst[x + 1] = table_u[val];
dst[x + 2] = table_y2[val];
dst[x + 3] = table_v[val];
x += 4;
} else {
int incr = (val - 0xDF) * 4;
if (x + incr >= avctx->width * 2) {
int iy = ((x + incr) / (avctx->width * 2));
x = (x + incr) % (avctx->width * 2);
y += iy;
dst += iy * p->linesize[0];
} else {
x += incr;
}
}
} else {
int y1, y2, u, v;
y1 = get_vlc2(&gb, s->vlc[1].table, s->vlc[1].bits, 3);
u = get_vlc2(&gb, s->vlc[2].table, s->vlc[2].bits, 3);
y2 = get_vlc2(&gb, s->vlc[1].table, s->vlc[1].bits, 3);
v = get_vlc2(&gb, s->vlc[3].table, s->vlc[3].bits, 3);
if (y1 < 0 || y2 < 0 || u < 0 || v < 0)
return AVERROR_INVALIDDATA;
dst[x ] = y1;
dst[x + 1] = u;
dst[x + 2] = y1 + y2;
dst[x + 3] = v;
x += 4;
}
}
dst += p->linesize[0];
}
dst = p->data[0];
for (x = 0; x < avctx->width * 2; x += 4) {
dst[x ] = dst[x ] + L[0];
dst[x + 2] = L[0] = dst[x + 2] + L[0];
L[1] = dst[x + 1] + L[1];
dst[x + 1] = L[1];
L[2] = dst[x + 3] + L[2];
dst[x + 3] = L[2];
}
dst += p->linesize[0];
for (y = 1; y < avctx->height; y++) {
x = 0;
dst[x ] = dst[x ] + L[0] + dst[x + 0 - p->linesize[0]] - TL[0];
dst[x + 2] = L[0] = dst[x + 2] + L[0] + dst[x + 2 - p->linesize[0]] - TL[0];
TL[0] = dst[x + 2 - p->linesize[0]];
L[1] = dst[x + 1] + L[1] + dst[x + 1 - p->linesize[0]] - TL[1];
dst[x + 1] = L[1];
TL[1] = dst[x + 1 - p->linesize[0]];
L[2] = dst[x + 3] + L[2] + dst[x + 3 - p->linesize[0]] - TL[2];
dst[x + 3] = L[2];
TL[2] = dst[x + 3 - p->linesize[0]];
for (x = 4; x < avctx->width * 2; x += 4) {
dst[x ] = dst[x ] + L[0] + dst[x + 0 - p->linesize[0]] - TL[0];
dst[x + 2] = L[0] = dst[x + 2] + L[0] + dst[x + 2 - p->linesize[0]] - TL[0];
TL[0] = dst[x + 2 - p->linesize[0]];
L[1] = dst[x + 1] + L[1] + dst[x + 1 - p->linesize[0]] - TL[1];
dst[x + 1] = L[1];
TL[1] = dst[x + 1 - p->linesize[0]];
L[2] = dst[x + 3] + L[2] + dst[x + 3 - p->linesize[0]] - TL[2];
dst[x + 3] = L[2];
TL[2] = dst[x + 3 - p->linesize[0]];
}
dst += p->linesize[0];
}
p->pict_type = AV_PICTURE_TYPE_I;
p->key_frame = 1;
*got_frame = 1;
return avpkt->size;
}
static av_cold int decode_end(AVCodecContext *avctx)
{
YLCContext *s = avctx->priv_data;
ff_free_vlc(&s->vlc[0]);
ff_free_vlc(&s->vlc[1]);
ff_free_vlc(&s->vlc[2]);
ff_free_vlc(&s->vlc[3]);
av_freep(&s->table_bits);
s->table_bits_size = 0;
av_freep(&s->bitstream_bits);
s->bitstream_bits_size = 0;
return 0;
}
AVCodec ff_ylc_decoder = {
.name = "ylc",
.long_name = NULL_IF_CONFIG_SMALL("YUY2 Lossless Codec"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_YLC,
.priv_data_size = sizeof(YLCContext),
.init = decode_init,
.close = decode_end,
.decode = decode_frame,
.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
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