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FFmpeg/libavcodec/smacker.c
Andreas Rheinhardt 4243da4ff4 avcodec/codec_internal: Use union for FFCodec decode/encode callbacks 
This is possible, because every given FFCodec has to implement
exactly one of these. Doing so decreases sizeof(FFCodec) and
therefore decreases the size of the binary.
Notice that in case of position-independent code the decrease
is in .data.rel.ro, so that this translates to decreased
memory consumption.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-04-05 20:02:37 +02:00

748 lines
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/*
* Smacker decoder
* Copyright (c) 2006 Konstantin Shishkov
*
* 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
*/
/**
* @file
* Smacker decoder
*/
/*
* Based on http://wiki.multimedia.cx/index.php?title=Smacker
*/
#include <stdio.h>
#include <stdlib.h>
#include "libavutil/channel_layout.h"
#include "avcodec.h"
#define SMKTREE_BITS 9
#define SMK_NODE 0x80000000
#define SMKTREE_DECODE_MAX_RECURSION FFMIN(32, 3 * SMKTREE_BITS)
#define SMKTREE_DECODE_BIG_MAX_RECURSION 500
/* The maximum possible unchecked overread happens in decode_header_trees:
* Decoding the MMAP tree can overread by 6 * SMKTREE_BITS + 1, followed by
* three get_bits1, followed by at most 2 + 3 * 16 read bits when reading
* the TYPE tree before the next check. 64 is because of 64 bit reads. */
#if (6 * SMKTREE_BITS + 1 + 3 + (2 + 3 * 16) + 64) <= 8 * AV_INPUT_BUFFER_PADDING_SIZE
#define UNCHECKED_BITSTREAM_READER 1
#endif
#define BITSTREAM_READER_LE
#include "bytestream.h"
#include "codec_internal.h"
#include "get_bits.h"
#include "internal.h"
#include "mathops.h"
typedef struct SmackVContext {
AVCodecContext *avctx;
AVFrame *pic;
int *mmap_tbl, *mclr_tbl, *full_tbl, *type_tbl;
int mmap_last[3], mclr_last[3], full_last[3], type_last[3];
} SmackVContext;
typedef struct HuffEntry {
uint8_t value;
uint8_t length;
} HuffEntry;
/**
* Context used for code reconstructing
*/
typedef struct HuffContext {
int current;
HuffEntry entries[256];
} HuffContext;
/* common parameters used for decode_bigtree */
typedef struct DBCtx {
int current, length;
int *values;
VLC *v1, *v2;
uint8_t vals[2];
int escapes[3];
int *last;
} DBCtx;
/* possible runs of blocks */
static const int block_runs[64] = {
1, 2, 3, 4, 5, 6, 7, 8,
9, 10, 11, 12, 13, 14, 15, 16,
17, 18, 19, 20, 21, 22, 23, 24,
25, 26, 27, 28, 29, 30, 31, 32,
33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48,
49, 50, 51, 52, 53, 54, 55, 56,
57, 58, 59, 128, 256, 512, 1024, 2048 };
enum SmkBlockTypes {
SMK_BLK_MONO = 0,
SMK_BLK_FULL = 1,
SMK_BLK_SKIP = 2,
SMK_BLK_FILL = 3 };
/**
* Decode local frame tree
*
* Can read SMKTREE_DECODE_MAX_RECURSION before the first check;
* does not overread gb on success.
*/
static int smacker_decode_tree(GetBitContext *gb, HuffContext *hc, int length)
{
if (length > SMKTREE_DECODE_MAX_RECURSION || length > 3 * SMKTREE_BITS) {
av_log(NULL, AV_LOG_ERROR, "Maximum tree recursion level exceeded.\n");
return AVERROR_INVALIDDATA;
}
if(!get_bits1(gb)){ //Leaf
if (hc->current >= 256) {
av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
return AVERROR_INVALIDDATA;
}
if (get_bits_left(gb) < 8)
return AVERROR_INVALIDDATA;
hc->entries[hc->current++] = (HuffEntry){ get_bits(gb, 8), length };
return 0;
} else { //Node
int r;
length++;
r = smacker_decode_tree(gb, hc, length);
if(r)
return r;
return smacker_decode_tree(gb, hc, length);
}
}
/**
* Decode header tree
*
* Checks before the first read, can overread by 6 * SMKTREE_BITS on success.
*/
static int smacker_decode_bigtree(GetBitContext *gb, DBCtx *ctx, int length)
{
// Larger length can cause segmentation faults due to too deep recursion.
if (length > SMKTREE_DECODE_BIG_MAX_RECURSION) {
av_log(NULL, AV_LOG_ERROR, "Maximum bigtree recursion level exceeded.\n");
return AVERROR_INVALIDDATA;
}
if (ctx->current >= ctx->length) {
av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
return AVERROR_INVALIDDATA;
}
if (get_bits_left(gb) <= 0)
return AVERROR_INVALIDDATA;
if(!get_bits1(gb)){ //Leaf
int val, i1, i2;
i1 = ctx->v1->table ? get_vlc2(gb, ctx->v1->table, SMKTREE_BITS, 3)
: ctx->vals[0];
i2 = ctx->v2->table ? get_vlc2(gb, ctx->v2->table, SMKTREE_BITS, 3)
: ctx->vals[1];
val = i1 | (i2 << 8);
if(val == ctx->escapes[0]) {
ctx->last[0] = ctx->current;
val = 0;
} else if(val == ctx->escapes[1]) {
ctx->last[1] = ctx->current;
val = 0;
} else if(val == ctx->escapes[2]) {
ctx->last[2] = ctx->current;
val = 0;
}
ctx->values[ctx->current++] = val;
return 1;
} else { //Node
int r = 0, r_new, t;
t = ctx->current++;
r = smacker_decode_bigtree(gb, ctx, length + 1);
if(r < 0)
return r;
ctx->values[t] = SMK_NODE | r;
r++;
r_new = smacker_decode_bigtree(gb, ctx, length + 1);
if (r_new < 0)
return r_new;
return r + r_new;
}
}
/**
* Store large tree as FFmpeg's vlc codes
*
* Can read FFMAX(1 + SMKTREE_DECODE_MAX_RECURSION, 2 + 3 * 16) bits
* before the first check; can overread by 6 * SMKTREE_BITS + 1 on success.
*/
static int smacker_decode_header_tree(SmackVContext *smk, GetBitContext *gb, int **recodes, int *last, int size)
{
VLC vlc[2] = { { 0 } };
int escapes[3];
DBCtx ctx;
int err;
if(size >= UINT_MAX>>4){ // (((size + 3) >> 2) + 3) << 2 must not overflow
av_log(smk->avctx, AV_LOG_ERROR, "size too large\n");
return AVERROR_INVALIDDATA;
}
for (int i = 0; i < 2; i++) {
HuffContext h;
h.current = 0;
if (!get_bits1(gb)) {
ctx.vals[i] = 0;
av_log(smk->avctx, AV_LOG_ERROR, "Skipping %s bytes tree\n",
i ? "high" : "low");
continue;
}
err = smacker_decode_tree(gb, &h, 0);
if (err < 0)
goto error;
skip_bits1(gb);
if (h.current > 1) {
err = ff_init_vlc_from_lengths(&vlc[i], SMKTREE_BITS, h.current,
&h.entries[0].length, sizeof(*h.entries),
&h.entries[0].value, sizeof(*h.entries), 1,
0, INIT_VLC_OUTPUT_LE, smk->avctx);
if (err < 0) {
av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
goto error;
}
} else
ctx.vals[i] = h.entries[0].value;
}
escapes[0] = get_bits(gb, 16);
escapes[1] = get_bits(gb, 16);
escapes[2] = get_bits(gb, 16);
last[0] = last[1] = last[2] = -1;
ctx.escapes[0] = escapes[0];
ctx.escapes[1] = escapes[1];
ctx.escapes[2] = escapes[2];
ctx.v1 = &vlc[0];
ctx.v2 = &vlc[1];
ctx.last = last;
ctx.length = (size + 3) >> 2;
ctx.current = 0;
ctx.values = av_malloc_array(ctx.length + 3, sizeof(ctx.values[0]));
if (!ctx.values) {
err = AVERROR(ENOMEM);
goto error;
}
*recodes = ctx.values;
err = smacker_decode_bigtree(gb, &ctx, 0);
if (err < 0)
goto error;
skip_bits1(gb);
if (ctx.last[0] == -1) ctx.last[0] = ctx.current++;
if (ctx.last[1] == -1) ctx.last[1] = ctx.current++;
if (ctx.last[2] == -1) ctx.last[2] = ctx.current++;
err = 0;
error:
for (int i = 0; i < 2; i++) {
ff_free_vlc(&vlc[i]);
}
return err;
}
static int decode_header_trees(SmackVContext *smk) {
GetBitContext gb;
int mmap_size, mclr_size, full_size, type_size, ret;
int skip = 0;
mmap_size = AV_RL32(smk->avctx->extradata);
mclr_size = AV_RL32(smk->avctx->extradata + 4);
full_size = AV_RL32(smk->avctx->extradata + 8);
type_size = AV_RL32(smk->avctx->extradata + 12);
ret = init_get_bits8(&gb, smk->avctx->extradata + 16, smk->avctx->extradata_size - 16);
if (ret < 0)
return ret;
if(!get_bits1(&gb)) {
skip ++;
av_log(smk->avctx, AV_LOG_INFO, "Skipping MMAP tree\n");
smk->mmap_tbl = av_malloc(sizeof(int) * 2);
if (!smk->mmap_tbl)
return AVERROR(ENOMEM);
smk->mmap_tbl[0] = 0;
smk->mmap_last[0] = smk->mmap_last[1] = smk->mmap_last[2] = 1;
} else {
ret = smacker_decode_header_tree(smk, &gb, &smk->mmap_tbl, smk->mmap_last, mmap_size);
if (ret < 0)
return ret;
}
if(!get_bits1(&gb)) {
skip ++;
av_log(smk->avctx, AV_LOG_INFO, "Skipping MCLR tree\n");
smk->mclr_tbl = av_malloc(sizeof(int) * 2);
if (!smk->mclr_tbl)
return AVERROR(ENOMEM);
smk->mclr_tbl[0] = 0;
smk->mclr_last[0] = smk->mclr_last[1] = smk->mclr_last[2] = 1;
} else {
ret = smacker_decode_header_tree(smk, &gb, &smk->mclr_tbl, smk->mclr_last, mclr_size);
if (ret < 0)
return ret;
}
if(!get_bits1(&gb)) {
skip ++;
av_log(smk->avctx, AV_LOG_INFO, "Skipping FULL tree\n");
smk->full_tbl = av_malloc(sizeof(int) * 2);
if (!smk->full_tbl)
return AVERROR(ENOMEM);
smk->full_tbl[0] = 0;
smk->full_last[0] = smk->full_last[1] = smk->full_last[2] = 1;
} else {
ret = smacker_decode_header_tree(smk, &gb, &smk->full_tbl, smk->full_last, full_size);
if (ret < 0)
return ret;
}
if(!get_bits1(&gb)) {
skip ++;
av_log(smk->avctx, AV_LOG_INFO, "Skipping TYPE tree\n");
smk->type_tbl = av_malloc(sizeof(int) * 2);
if (!smk->type_tbl)
return AVERROR(ENOMEM);
smk->type_tbl[0] = 0;
smk->type_last[0] = smk->type_last[1] = smk->type_last[2] = 1;
} else {
ret = smacker_decode_header_tree(smk, &gb, &smk->type_tbl, smk->type_last, type_size);
if (ret < 0)
return ret;
}
if (skip == 4 || get_bits_left(&gb) < 0)
return AVERROR_INVALIDDATA;
return 0;
}
static av_always_inline void last_reset(int *recode, int *last) {
recode[last[0]] = recode[last[1]] = recode[last[2]] = 0;
}
/* Get code and update history.
* Checks before reading, does not overread. */
static av_always_inline int smk_get_code(GetBitContext *gb, int *recode, int *last) {
register int *table = recode;
int v;
while(*table & SMK_NODE) {
if (get_bits_left(gb) < 1)
return AVERROR_INVALIDDATA;
if(get_bits1(gb))
table += (*table) & (~SMK_NODE);
table++;
}
v = *table;
if(v != recode[last[0]]) {
recode[last[2]] = recode[last[1]];
recode[last[1]] = recode[last[0]];
recode[last[0]] = v;
}
return v;
}
static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
int *got_frame, AVPacket *avpkt)
{
SmackVContext * const smk = avctx->priv_data;
uint8_t *out;
uint32_t *pal;
GetByteContext gb2;
GetBitContext gb;
int blocks, blk, bw, bh;
int i, ret;
int stride;
int flags;
if (avpkt->size <= 769)
return AVERROR_INVALIDDATA;
if ((ret = ff_reget_buffer(avctx, smk->pic, 0)) < 0)
return ret;
/* make the palette available on the way out */
pal = (uint32_t*)smk->pic->data[1];
bytestream2_init(&gb2, avpkt->data, avpkt->size);
flags = bytestream2_get_byteu(&gb2);
smk->pic->palette_has_changed = flags & 1;
smk->pic->key_frame = !!(flags & 2);
if (smk->pic->key_frame)
smk->pic->pict_type = AV_PICTURE_TYPE_I;
else
smk->pic->pict_type = AV_PICTURE_TYPE_P;
for(i = 0; i < 256; i++)
*pal++ = 0xFFU << 24 | bytestream2_get_be24u(&gb2);
last_reset(smk->mmap_tbl, smk->mmap_last);
last_reset(smk->mclr_tbl, smk->mclr_last);
last_reset(smk->full_tbl, smk->full_last);
last_reset(smk->type_tbl, smk->type_last);
if ((ret = init_get_bits8(&gb, avpkt->data + 769, avpkt->size - 769)) < 0)
return ret;
blk = 0;
bw = avctx->width >> 2;
bh = avctx->height >> 2;
blocks = bw * bh;
stride = smk->pic->linesize[0];
while(blk < blocks) {
int type, run, mode;
uint16_t pix;
type = smk_get_code(&gb, smk->type_tbl, smk->type_last);
if (type < 0)
return type;
run = block_runs[(type >> 2) & 0x3F];
switch(type & 3){
case SMK_BLK_MONO:
while(run-- && blk < blocks){
int clr, map;
int hi, lo;
clr = smk_get_code(&gb, smk->mclr_tbl, smk->mclr_last);
map = smk_get_code(&gb, smk->mmap_tbl, smk->mmap_last);
out = smk->pic->data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
hi = clr >> 8;
lo = clr & 0xFF;
for(i = 0; i < 4; i++) {
if(map & 1) out[0] = hi; else out[0] = lo;
if(map & 2) out[1] = hi; else out[1] = lo;
if(map & 4) out[2] = hi; else out[2] = lo;
if(map & 8) out[3] = hi; else out[3] = lo;
map >>= 4;
out += stride;
}
blk++;
}
break;
case SMK_BLK_FULL:
mode = 0;
if(avctx->codec_tag == MKTAG('S', 'M', 'K', '4')) { // In case of Smacker v4 we have three modes
if (get_bits_left(&gb) < 1)
return AVERROR_INVALIDDATA;
if(get_bits1(&gb)) mode = 1;
else if(get_bits1(&gb)) mode = 2;
}
while(run-- && blk < blocks){
out = smk->pic->data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
switch(mode){
case 0:
for(i = 0; i < 4; i++) {
pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
AV_WL16(out+2,pix);
pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
AV_WL16(out,pix);
out += stride;
}
break;
case 1:
pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
out[0] = out[1] = pix & 0xFF;
out[2] = out[3] = pix >> 8;
out += stride;
out[0] = out[1] = pix & 0xFF;
out[2] = out[3] = pix >> 8;
out += stride;
pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
out[0] = out[1] = pix & 0xFF;
out[2] = out[3] = pix >> 8;
out += stride;
out[0] = out[1] = pix & 0xFF;
out[2] = out[3] = pix >> 8;
break;
case 2:
for(i = 0; i < 2; i++) {
uint16_t pix1, pix2;
pix2 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
pix1 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
AV_WL16(out,pix1);
AV_WL16(out+2,pix2);
out += stride;
AV_WL16(out,pix1);
AV_WL16(out+2,pix2);
out += stride;
}
break;
}
blk++;
}
break;
case SMK_BLK_SKIP:
while(run-- && blk < blocks)
blk++;
break;
case SMK_BLK_FILL:
mode = type >> 8;
while(run-- && blk < blocks){
uint32_t col;
out = smk->pic->data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
col = mode * 0x01010101U;
for(i = 0; i < 4; i++) {
*((uint32_t*)out) = col;
out += stride;
}
blk++;
}
break;
}
}
if ((ret = av_frame_ref(rframe, smk->pic)) < 0)
return ret;
*got_frame = 1;
/* always report that the buffer was completely consumed */
return avpkt->size;
}
static av_cold int decode_end(AVCodecContext *avctx)
{
SmackVContext * const smk = avctx->priv_data;
av_freep(&smk->mmap_tbl);
av_freep(&smk->mclr_tbl);
av_freep(&smk->full_tbl);
av_freep(&smk->type_tbl);
av_frame_free(&smk->pic);
return 0;
}
static av_cold int decode_init(AVCodecContext *avctx)
{
SmackVContext * const c = avctx->priv_data;
int ret;
c->avctx = avctx;
avctx->pix_fmt = AV_PIX_FMT_PAL8;
c->pic = av_frame_alloc();
if (!c->pic)
return AVERROR(ENOMEM);
/* decode huffman trees from extradata */
if (avctx->extradata_size <= 16){
av_log(avctx, AV_LOG_ERROR, "Extradata missing!\n");
return AVERROR(EINVAL);
}
ret = decode_header_trees(c);
if (ret < 0) {
return ret;
}
return 0;
}
static av_cold int smka_decode_init(AVCodecContext *avctx)
{
int channels = avctx->ch_layout.nb_channels;
if (channels < 1 || channels > 2) {
av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n");
return AVERROR_INVALIDDATA;
}
av_channel_layout_uninit(&avctx->ch_layout);
av_channel_layout_default(&avctx->ch_layout, channels);
avctx->sample_fmt = avctx->bits_per_coded_sample == 8 ? AV_SAMPLE_FMT_U8 : AV_SAMPLE_FMT_S16;
return 0;
}
/**
* Decode Smacker audio data
*/
static int smka_decode_frame(AVCodecContext *avctx, AVFrame *frame,
int *got_frame_ptr, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
GetBitContext gb;
VLC vlc[4] = { { 0 } };
int16_t *samples;
uint8_t *samples8;
uint8_t values[4];
int i, res, ret;
int unp_size;
int bits, stereo;
unsigned pred[2], val;
if (buf_size <= 4) {
av_log(avctx, AV_LOG_ERROR, "packet is too small\n");
return AVERROR_INVALIDDATA;
}
unp_size = AV_RL32(buf);
if (unp_size > (1U<<24)) {
av_log(avctx, AV_LOG_ERROR, "packet is too big\n");
return AVERROR_INVALIDDATA;
}
if ((ret = init_get_bits8(&gb, buf + 4, buf_size - 4)) < 0)
return ret;
if(!get_bits1(&gb)){
av_log(avctx, AV_LOG_INFO, "Sound: no data\n");
*got_frame_ptr = 0;
return 1;
}
stereo = get_bits1(&gb);
bits = get_bits1(&gb);
if (stereo ^ (avctx->ch_layout.nb_channels != 1)) {
av_log(avctx, AV_LOG_ERROR, "channels mismatch\n");
return AVERROR_INVALIDDATA;
}
if (bits == (avctx->sample_fmt == AV_SAMPLE_FMT_U8)) {
av_log(avctx, AV_LOG_ERROR, "sample format mismatch\n");
return AVERROR_INVALIDDATA;
}
/* get output buffer */
frame->nb_samples = unp_size / (avctx->ch_layout.nb_channels * (bits + 1));
if (unp_size % (avctx->ch_layout.nb_channels * (bits + 1))) {
av_log(avctx, AV_LOG_ERROR,
"The buffer does not contain an integer number of samples\n");
return AVERROR_INVALIDDATA;
}
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
samples = (int16_t *)frame->data[0];
samples8 = frame->data[0];
// Initialize
for(i = 0; i < (1 << (bits + stereo)); i++) {
HuffContext h;
h.current = 0;
skip_bits1(&gb);
if ((ret = smacker_decode_tree(&gb, &h, 0)) < 0)
goto error;
skip_bits1(&gb);
if (h.current > 1) {
ret = ff_init_vlc_from_lengths(&vlc[i], SMKTREE_BITS, h.current,
&h.entries[0].length, sizeof(*h.entries),
&h.entries[0].value, sizeof(*h.entries), 1,
0, INIT_VLC_OUTPUT_LE, avctx);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
goto error;
}
} else
values[i] = h.entries[0].value;
}
/* this codec relies on wraparound instead of clipping audio */
if(bits) { //decode 16-bit data
for(i = stereo; i >= 0; i--)
pred[i] = av_bswap16(get_bits(&gb, 16));
for(i = 0; i <= stereo; i++)
*samples++ = pred[i];
for(; i < unp_size / 2; i++) {
unsigned idx = 2 * (i & stereo);
if (get_bits_left(&gb) < 0) {
ret = AVERROR_INVALIDDATA;
goto error;
}
if (vlc[idx].table)
res = get_vlc2(&gb, vlc[idx].table, SMKTREE_BITS, 3);
else
res = values[idx];
val = res;
if (vlc[++idx].table)
res = get_vlc2(&gb, vlc[idx].table, SMKTREE_BITS, 3);
else
res = values[idx];
val |= res << 8;
pred[idx / 2] += val;
*samples++ = pred[idx / 2];
}
} else { //8-bit data
for(i = stereo; i >= 0; i--)
pred[i] = get_bits(&gb, 8);
for(i = 0; i <= stereo; i++)
*samples8++ = pred[i];
for(; i < unp_size; i++) {
unsigned idx = i & stereo;
if (get_bits_left(&gb) < 0) {
ret = AVERROR_INVALIDDATA;
goto error;
}
if (vlc[idx].table)
val = get_vlc2(&gb, vlc[idx].table, SMKTREE_BITS, 3);
else
val = values[idx];
pred[idx] += val;
*samples8++ = pred[idx];
}
}
*got_frame_ptr = 1;
ret = buf_size;
error:
for(i = 0; i < 4; i++) {
ff_free_vlc(&vlc[i]);
}
return ret;
}
const FFCodec ff_smacker_decoder = {
.p.name = "smackvid",
.p.long_name = NULL_IF_CONFIG_SMALL("Smacker video"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_SMACKVIDEO,
.priv_data_size = sizeof(SmackVContext),
.init = decode_init,
.close = decode_end,
FF_CODEC_DECODE_CB(decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP | FF_CODEC_CAP_INIT_THREADSAFE,
};
const FFCodec ff_smackaud_decoder = {
.p.name = "smackaud",
.p.long_name = NULL_IF_CONFIG_SMALL("Smacker audio"),
.p.type = AVMEDIA_TYPE_AUDIO,
.p.id = AV_CODEC_ID_SMACKAUDIO,
.init = smka_decode_init,
FF_CODEC_DECODE_CB(smka_decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
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