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FFmpeg/libavcodec/mv30.c
Andreas Rheinhardt a247ac640d avcodec: Constify AVCodecs 
Given that the AVCodec.next pointer has now been removed, most of the
AVCodecs are not modified at all any more and can therefore be made
const (as this patch does); the only exceptions are the very few codecs
for external libraries that have a init_static_data callback.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
2021-04-27 10:43:15 -03:00

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/*
* MidiVid MV30 decoder
*
* Copyright (c) 2020 Paul B Mahol
*
* 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/thread.h"
#include "avcodec.h"
#include "bytestream.h"
#include "copy_block.h"
#include "mathops.h"
#include "blockdsp.h"
#include "get_bits.h"
#include "internal.h"
#include "aandcttab.h"
#define CBP_VLC_BITS 9
typedef struct MV30Context {
GetBitContext gb;
int intra_quant;
int inter_quant;
int is_inter;
int mode_size;
int nb_mvectors;
int block[6][64];
int16_t *mvectors;
unsigned int mvectors_size;
int16_t *coeffs;
unsigned int coeffs_size;
int16_t intraq_tab[2][64];
int16_t interq_tab[2][64];
BlockDSPContext bdsp;
AVFrame *prev_frame;
} MV30Context;
static VLC cbp_tab;
static const uint8_t luma_tab[] = {
12, 12, 15, 19, 25, 34, 40, 48,
12, 12, 18, 22, 27, 44, 47, 46,
17, 18, 21, 26, 35, 46, 52, 47,
18, 20, 24, 28, 40, 61, 59, 51,
20, 24, 32, 43, 50, 72, 72, 63,
25, 31, 42, 48, 58, 72, 81, 75,
38, 46, 54, 61, 71, 84, 88, 85,
50, 61, 65, 68, 79, 78, 86, 91,
};
static const uint8_t chroma_tab[] = {
12, 16, 24, 47, 99, 99, 99, 99,
16, 21, 26, 66, 99, 99, 99, 99,
24, 26, 56, 99, 99, 99, 99, 99,
47, 66, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99,
99, 99, 99, 99, 99, 99, 99, 99,
};
static const uint8_t zigzag[] = {
0, 1, 8, 9, 16, 2, 3, 10,
17, 24, 32, 25, 18, 11, 4, 5,
12, 19, 26, 33, 40, 48, 41, 34,
27, 20, 13, 6, 7, 14, 21, 28,
35, 42, 49, 56, 57, 50, 43, 36,
29, 22, 15, 23, 30, 37, 44, 51,
58, 59, 52, 45, 38, 31, 39, 46,
53, 60, 61, 54, 47, 55, 62, 63,
};
static void get_qtable(int16_t *table, int quant, const uint8_t *quant_tab)
{
int factor = quant < 50 ? 5000 / FFMAX(quant, 1) : 200 - FFMIN(quant, 100) * 2;
for (int i = 0; i < 64; i++) {
table[i] = av_clip((quant_tab[i] * factor + 0x32) / 100, 1, 0x7fff);
table[i] = ((int)ff_aanscales[i] * (int)table[i] + 0x800) >> 12;
}
}
static inline void idct_1d(unsigned *blk, int step)
{
const unsigned t0 = blk[0 * step] + blk[4 * step];
const unsigned t1 = blk[0 * step] - blk[4 * step];
const unsigned t2 = blk[2 * step] + blk[6 * step];
const unsigned t3 = ((int)((blk[2 * step] - blk[6 * step]) * 362U) >> 8) - t2;
const unsigned t4 = t0 + t2;
const unsigned t5 = t0 - t2;
const unsigned t6 = t1 + t3;
const unsigned t7 = t1 - t3;
const unsigned t8 = blk[5 * step] + blk[3 * step];
const unsigned t9 = blk[5 * step] - blk[3 * step];
const unsigned tA = blk[1 * step] + blk[7 * step];
const unsigned tB = blk[1 * step] - blk[7 * step];
const unsigned tC = t8 + tA;
const unsigned tD = (int)((tB + t9) * 473U) >> 8;
const unsigned tE = (((int)(t9 * -669U) >> 8) - tC) + tD;
const unsigned tF = ((int)((tA - t8) * 362U) >> 8) - tE;
const unsigned t10 = (((int)(tB * 277U) >> 8) - tD) + tF;
blk[0 * step] = t4 + tC;
blk[1 * step] = t6 + tE;
blk[2 * step] = t7 + tF;
blk[3 * step] = t5 - t10;
blk[4 * step] = t5 + t10;
blk[5 * step] = t7 - tF;
blk[6 * step] = t6 - tE;
blk[7 * step] = t4 - tC;
}
static void idct_put(uint8_t *dst, int stride, int *block)
{
for (int i = 0; i < 8; i++) {
if ((block[0x08 + i] |
block[0x10 + i] |
block[0x18 + i] |
block[0x20 + i] |
block[0x28 + i] |
block[0x30 + i] |
block[0x38 + i]) == 0) {
block[0x08 + i] = block[i];
block[0x10 + i] = block[i];
block[0x18 + i] = block[i];
block[0x20 + i] = block[i];
block[0x28 + i] = block[i];
block[0x30 + i] = block[i];
block[0x38 + i] = block[i];
} else {
idct_1d(block + i, 8);
}
}
for (int i = 0; i < 8; i++) {
idct_1d(block, 1);
for (int j = 0; j < 8; j++)
dst[j] = av_clip_uint8((block[j] >> 5) + 128);
block += 8;
dst += stride;
}
}
static void idct_add(uint8_t *dst, int stride,
const uint8_t *src, int in_linesize, int *block)
{
for (int i = 0; i < 8; i++) {
if ((block[0x08 + i] |
block[0x10 + i] |
block[0x18 + i] |
block[0x20 + i] |
block[0x28 + i] |
block[0x30 + i] |
block[0x38 + i]) == 0) {
block[0x08 + i] = block[i];
block[0x10 + i] = block[i];
block[0x18 + i] = block[i];
block[0x20 + i] = block[i];
block[0x28 + i] = block[i];
block[0x30 + i] = block[i];
block[0x38 + i] = block[i];
} else {
idct_1d(block + i, 8);
}
}
for (int i = 0; i < 8; i++) {
idct_1d(block, 1);
for (int j = 0; j < 8; j++)
dst[j] = av_clip_uint8((block[j] >> 5) + src[j]);
block += 8;
dst += stride;
src += in_linesize;
}
}
static inline void idct2_1d(int *blk, int step)
{
const unsigned int t0 = blk[0 * step];
const unsigned int t1 = blk[1 * step];
const unsigned int t2 = (int)(t1 * 473U) >> 8;
const unsigned int t3 = t2 - t1;
const unsigned int t4 = ((int)(t1 * 362U) >> 8) - t3;
const unsigned int t5 = (((int)(t1 * 277U) >> 8) - t2) + t4;
blk[0 * step] = t1 + t0;
blk[1 * step] = t0 + t3;
blk[2 * step] = t4 + t0;
blk[3 * step] = t0 - t5;
blk[4 * step] = t5 + t0;
blk[5 * step] = t0 - t4;
blk[6 * step] = t0 - t3;
blk[7 * step] = t0 - t1;
}
static void idct2_put(uint8_t *dst, int stride, int *block)
{
for (int i = 0; i < 2; i++) {
if ((block[0x08 + i]) == 0) {
block[0x08 + i] = block[i];
block[0x10 + i] = block[i];
block[0x18 + i] = block[i];
block[0x20 + i] = block[i];
block[0x28 + i] = block[i];
block[0x30 + i] = block[i];
block[0x38 + i] = block[i];
} else {
idct2_1d(block + i, 8);
}
}
for (int i = 0; i < 8; i++) {
if (block[1] == 0) {
for (int j = 0; j < 8; j++)
dst[j] = av_clip_uint8((block[0] >> 5) + 128);
} else {
idct2_1d(block, 1);
for (int j = 0; j < 8; j++)
dst[j] = av_clip_uint8((block[j] >> 5) + 128);
}
block += 8;
dst += stride;
}
}
static void idct2_add(uint8_t *dst, int stride,
const uint8_t *src, int in_linesize,
int *block)
{
for (int i = 0; i < 2; i++) {
if ((block[0x08 + i]) == 0) {
block[0x08 + i] = block[i];
block[0x10 + i] = block[i];
block[0x18 + i] = block[i];
block[0x20 + i] = block[i];
block[0x28 + i] = block[i];
block[0x30 + i] = block[i];
block[0x38 + i] = block[i];
} else {
idct2_1d(block + i, 8);
}
}
for (int i = 0; i < 8; i++) {
if (block[1] == 0) {
for (int j = 0; j < 8; j++)
dst[j] = av_clip_uint8((block[0] >> 5) + src[j]);
} else {
idct2_1d(block, 1);
for (int j = 0; j < 8; j++)
dst[j] = av_clip_uint8((block[j] >> 5) + src[j]);
}
block += 8;
dst += stride;
src += in_linesize;
}
}
static void update_inter_block(uint8_t *dst, int stride,
const uint8_t *src, int in_linesize,
int block)
{
for (int i = 0; i < 8; i++) {
for (int j = 0; j < 8; j++)
dst[j] = av_clip_uint8(block + src[j]);
dst += stride;
src += in_linesize;
}
}
static int decode_intra_block(AVCodecContext *avctx, int mode,
GetByteContext *gbyte, int16_t *qtab,
int *block, int *pfill,
uint8_t *dst, int linesize)
{
MV30Context *s = avctx->priv_data;
int fill;
switch (mode) {
case 0:
s->bdsp.fill_block_tab[1](dst, 128, linesize, 8);
break;
case 1:
fill = sign_extend(bytestream2_get_ne16(gbyte), 16);
pfill[0] += fill;
block[0] = ((int)((unsigned)pfill[0] * qtab[0]) >> 5) + 128;
s->bdsp.fill_block_tab[1](dst, block[0], linesize, 8);
break;
case 2:
memset(block, 0, sizeof(*block) * 64);
fill = sign_extend(bytestream2_get_ne16(gbyte), 16);
pfill[0] += fill;
block[0] = (unsigned)pfill[0] * qtab[0];
block[1] = sign_extend(bytestream2_get_ne16(gbyte), 16) * qtab[1];
block[8] = sign_extend(bytestream2_get_ne16(gbyte), 16) * qtab[8];
block[9] = sign_extend(bytestream2_get_ne16(gbyte), 16) * qtab[9];
idct2_put(dst, linesize, block);
break;
case 3:
fill = sign_extend(bytestream2_get_ne16(gbyte), 16);
pfill[0] += fill;
block[0] = (unsigned)pfill[0] * qtab[0];
for (int i = 1; i < 64; i++)
block[zigzag[i]] = sign_extend(bytestream2_get_ne16(gbyte), 16) * qtab[zigzag[i]];
idct_put(dst, linesize, block);
break;
}
return 0;
}
static int decode_inter_block(AVCodecContext *avctx, int mode,
GetByteContext *gbyte, int16_t *qtab,
int *block, int *pfill,
uint8_t *dst, int linesize,
const uint8_t *src, int in_linesize)
{
int fill;
switch (mode) {
case 0:
copy_block8(dst, src, linesize, in_linesize, 8);
break;
case 1:
fill = sign_extend(bytestream2_get_ne16(gbyte), 16);
pfill[0] += fill;
block[0] = (int)((unsigned)pfill[0] * qtab[0]) >> 5;
update_inter_block(dst, linesize, src, in_linesize, block[0]);
break;
case 2:
memset(block, 0, sizeof(*block) * 64);
fill = sign_extend(bytestream2_get_ne16(gbyte), 16);
pfill[0] += fill;
block[0] = (unsigned)pfill[0] * qtab[0];
block[1] = sign_extend(bytestream2_get_ne16(gbyte), 16) * qtab[1];
block[8] = sign_extend(bytestream2_get_ne16(gbyte), 16) * qtab[8];
block[9] = sign_extend(bytestream2_get_ne16(gbyte), 16) * qtab[9];
idct2_add(dst, linesize, src, in_linesize, block);
break;
case 3:
fill = sign_extend(bytestream2_get_ne16(gbyte), 16);
pfill[0] += fill;
block[0] = (unsigned)pfill[0] * qtab[0];
for (int i = 1; i < 64; i++)
block[zigzag[i]] = sign_extend(bytestream2_get_ne16(gbyte), 16) * qtab[zigzag[i]];
idct_add(dst, linesize, src, in_linesize, block);
break;
}
return 0;
}
static int decode_coeffs(GetBitContext *gb, int16_t *coeffs, int nb_codes)
{
memset(coeffs, 0, nb_codes * sizeof(*coeffs));
for (int i = 0; i < nb_codes;) {
int value = get_vlc2(gb, cbp_tab.table, CBP_VLC_BITS, 1);
if (value > 0) {
int x = get_bits(gb, value);
if (x < (1 << value) / 2) {
x = (1 << (value - 1)) + (x & ((1 << value) - 1 >> 1));
} else {
x = -(1 << (value - 1)) - (x & ((1 << value) - 1 >> 1));
}
coeffs[i++] = x;
} else {
int flag = get_bits1(gb);
i += get_bits(gb, 3 + flag * 3) + 1 + flag * 8;
}
}
return 0;
}
static int decode_intra(AVCodecContext *avctx, GetBitContext *gb, AVFrame *frame)
{
MV30Context *s = avctx->priv_data;
GetBitContext mgb;
uint8_t *dst[6];
int linesize[6];
int ret;
mgb = *gb;
if (get_bits_left(gb) < s->mode_size * 8)
return AVERROR_INVALIDDATA;
skip_bits_long(gb, s->mode_size * 8);
linesize[0] = frame->linesize[0];
linesize[1] = frame->linesize[0];
linesize[2] = frame->linesize[0];
linesize[3] = frame->linesize[0];
linesize[4] = frame->linesize[1];
linesize[5] = frame->linesize[2];
for (int y = 0; y < avctx->height; y += 16) {
GetByteContext gbyte;
int pfill[3][1] = { {0} };
int nb_codes = get_bits(gb, 16);
av_fast_padded_malloc(&s->coeffs, &s->coeffs_size, nb_codes * sizeof(*s->coeffs));
if (!s->coeffs)
return AVERROR(ENOMEM);
ret = decode_coeffs(gb, s->coeffs, nb_codes);
if (ret < 0)
return ret;
bytestream2_init(&gbyte, (uint8_t *)s->coeffs, nb_codes * sizeof(*s->coeffs));
for (int x = 0; x < avctx->width; x += 16) {
dst[0] = frame->data[0] + linesize[0] * y + x;
dst[1] = frame->data[0] + linesize[0] * y + x + 8;
dst[2] = frame->data[0] + linesize[0] * (y + 8) + x;
dst[3] = frame->data[0] + linesize[0] * (y + 8) + x + 8;
dst[4] = frame->data[1] + linesize[4] * (y >> 1) + (x >> 1);
dst[5] = frame->data[2] + linesize[5] * (y >> 1) + (x >> 1);
for (int b = 0; b < 6; b++) {
int mode = get_bits_le(&mgb, 2);
ret = decode_intra_block(avctx, mode, &gbyte, s->intraq_tab[b >= 4],
s->block[b],
pfill[(b >= 4) + (b >= 5)],
dst[b], linesize[b]);
if (ret < 0)
return ret;
}
}
}
return 0;
}
static int decode_inter(AVCodecContext *avctx, GetBitContext *gb,
AVFrame *frame, AVFrame *prev)
{
MV30Context *s = avctx->priv_data;
GetBitContext mask;
GetBitContext mgb;
GetByteContext mv;
const int mask_size = ((avctx->height >> 4) * (avctx->width >> 4) * 2 + 7) / 8;
uint8_t *dst[6], *src[6];
int in_linesize[6];
int linesize[6];
int ret, cnt = 0;
int flags = 0;
in_linesize[0] = prev->linesize[0];
in_linesize[1] = prev->linesize[0];
in_linesize[2] = prev->linesize[0];
in_linesize[3] = prev->linesize[0];
in_linesize[4] = prev->linesize[1];
in_linesize[5] = prev->linesize[2];
linesize[0] = frame->linesize[0];
linesize[1] = frame->linesize[0];
linesize[2] = frame->linesize[0];
linesize[3] = frame->linesize[0];
linesize[4] = frame->linesize[1];
linesize[5] = frame->linesize[2];
av_fast_padded_malloc(&s->mvectors, &s->mvectors_size, 2 * s->nb_mvectors * sizeof(*s->mvectors));
if (!s->mvectors) {
ret = AVERROR(ENOMEM);
goto fail;
}
mask = *gb;
skip_bits_long(gb, mask_size * 8);
mgb = *gb;
skip_bits_long(gb, s->mode_size * 8);
ret = decode_coeffs(gb, s->mvectors, 2 * s->nb_mvectors);
if (ret < 0)
goto fail;
bytestream2_init(&mv, (uint8_t *)s->mvectors, 2 * s->nb_mvectors * sizeof(*s->mvectors));
for (int y = 0; y < avctx->height; y += 16) {
GetByteContext gbyte;
int pfill[3][1] = { {0} };
int nb_codes = get_bits(gb, 16);
skip_bits(gb, 8);
if (get_bits_left(gb) < 0) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
av_fast_padded_malloc(&s->coeffs, &s->coeffs_size, nb_codes * sizeof(*s->coeffs));
if (!s->coeffs) {
ret = AVERROR(ENOMEM);
goto fail;
}
ret = decode_coeffs(gb, s->coeffs, nb_codes);
if (ret < 0)
goto fail;
bytestream2_init(&gbyte, (uint8_t *)s->coeffs, nb_codes * sizeof(*s->coeffs));
for (int x = 0; x < avctx->width; x += 16) {
if (cnt >= 4)
cnt = 0;
if (cnt == 0) {
if (get_bits_left(&mask) < 8) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
flags = get_bits(&mask, 8);
}
dst[0] = frame->data[0] + linesize[0] * y + x;
dst[1] = frame->data[0] + linesize[0] * y + x + 8;
dst[2] = frame->data[0] + linesize[0] * (y + 8) + x;
dst[3] = frame->data[0] + linesize[0] * (y + 8) + x + 8;
dst[4] = frame->data[1] + linesize[4] * (y >> 1) + (x >> 1);
dst[5] = frame->data[2] + linesize[5] * (y >> 1) + (x >> 1);
if ((flags >> (cnt)) & 1) {
int mv_x = sign_extend(bytestream2_get_ne16(&mv), 16);
int mv_y = sign_extend(bytestream2_get_ne16(&mv), 16);
int px = x + mv_x;
int py = y + mv_y;
if (px < 0 || px > FFALIGN(avctx->width , 16) - 16 ||
py < 0 || py > FFALIGN(avctx->height, 16) - 16)
return AVERROR_INVALIDDATA;
src[0] = prev->data[0] + in_linesize[0] * py + px;
src[1] = prev->data[0] + in_linesize[0] * py + px + 8;
src[2] = prev->data[0] + in_linesize[0] * (py + 8) + px;
src[3] = prev->data[0] + in_linesize[0] * (py + 8) + px + 8;
src[4] = prev->data[1] + in_linesize[4] * (py >> 1) + (px >> 1);
src[5] = prev->data[2] + in_linesize[5] * (py >> 1) + (px >> 1);
if ((flags >> (cnt + 4)) & 1) {
for (int b = 0; b < 6; b++)
copy_block8(dst[b], src[b], linesize[b], in_linesize[b], 8);
} else {
for (int b = 0; b < 6; b++) {
int mode = get_bits_le(&mgb, 2);
ret = decode_inter_block(avctx, mode, &gbyte, s->interq_tab[b >= 4],
s->block[b],
pfill[(b >= 4) + (b >= 5)],
dst[b], linesize[b],
src[b], in_linesize[b]);
if (ret < 0)
goto fail;
}
}
} else {
for (int b = 0; b < 6; b++) {
int mode = get_bits_le(&mgb, 2);
ret = decode_intra_block(avctx, mode, &gbyte, s->intraq_tab[b >= 4],
s->block[b],
pfill[(b >= 4) + (b >= 5)],
dst[b], linesize[b]);
if (ret < 0)
goto fail;
}
}
cnt++;
}
}
fail:
return ret;
}
static int decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
MV30Context *s = avctx->priv_data;
GetBitContext *gb = &s->gb;
AVFrame *frame = data;
int ret;
if ((ret = init_get_bits8(gb, avpkt->data, avpkt->size)) < 0)
return ret;
if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
return ret;
s->intra_quant = get_bits(gb, 8);
s->inter_quant = s->intra_quant + get_sbits(gb, 8);
s->is_inter = get_bits_le(gb, 16);
s->mode_size = get_bits_le(gb, 16);
if (s->is_inter)
s->nb_mvectors = get_bits_le(gb, 16);
get_qtable(s->intraq_tab[0], s->intra_quant, luma_tab);
get_qtable(s->intraq_tab[1], s->intra_quant, chroma_tab);
frame->key_frame = s->is_inter == 0;
if (frame->key_frame) {
ret = decode_intra(avctx, gb, frame);
if (ret < 0)
return ret;
} else {
get_qtable(s->interq_tab[0], s->inter_quant, luma_tab);
get_qtable(s->interq_tab[1], s->inter_quant, chroma_tab);
if (!s->prev_frame->data[0]) {
av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
return AVERROR_INVALIDDATA;
}
ret = decode_inter(avctx, gb, frame, s->prev_frame);
if (ret < 0)
return ret;
}
av_frame_unref(s->prev_frame);
if ((ret = av_frame_ref(s->prev_frame, frame)) < 0)
return ret;
*got_frame = 1;
return avpkt->size;
}
static const uint8_t cbp_bits[] = {
2, 2, 3, 3, 3, 4, 5, 6, 7, 8, 9, 9,
};
static av_cold void init_static_data(void)
{
INIT_VLC_STATIC_FROM_LENGTHS(&cbp_tab, CBP_VLC_BITS, FF_ARRAY_ELEMS(cbp_bits),
cbp_bits, 1, NULL, 0, 0, 0, 0, 1 << CBP_VLC_BITS);
}
static av_cold int decode_init(AVCodecContext *avctx)
{
MV30Context *s = avctx->priv_data;
static AVOnce init_static_once = AV_ONCE_INIT;
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
avctx->color_range = AVCOL_RANGE_JPEG;
ff_blockdsp_init(&s->bdsp, avctx);
s->prev_frame = av_frame_alloc();
if (!s->prev_frame)
return AVERROR(ENOMEM);
ff_thread_once(&init_static_once, init_static_data);
return 0;
}
static void decode_flush(AVCodecContext *avctx)
{
MV30Context *s = avctx->priv_data;
av_frame_unref(s->prev_frame);
}
static av_cold int decode_close(AVCodecContext *avctx)
{
MV30Context *s = avctx->priv_data;
av_frame_free(&s->prev_frame);
av_freep(&s->coeffs);
s->coeffs_size = 0;
av_freep(&s->mvectors);
s->mvectors_size = 0;
return 0;
}
const AVCodec ff_mv30_decoder = {
.name = "mv30",
.long_name = NULL_IF_CONFIG_SMALL("MidiVid 3.0"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_MV30,
.priv_data_size = sizeof(MV30Context),
.init = decode_init,
.close = decode_close,
.decode = decode_frame,
.flush = decode_flush,
.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
FF_CODEC_CAP_INIT_CLEANUP,
};
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