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FFmpeg/libavcodec/smacker.c
Andreas Rheinhardt fefe2cbbf2 avcodec/smacker: Improve creating Huffman VLC tables 
The Smacker Huffman tables are already stored in a tree-like structure;
in particular, they are naturally ordered from left to right in the
tree and are therefore suitable to be initialized by
ff_init_vlc_from_lengths() which avoids traversing the data twice in
order to sort only the codes that are so long that they need into a
subtable.

This improves performance (and reduces codesize): For the sample from
ticket #2425 the number of decicycles for parsing and creating the VLCs
in smka_decode_frame() decreased from 412322 to 359152 (tested with
10 runs each looping 20 times over the file).

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2020-12-08 17:51:44 +01:00

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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 "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, void *data, 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(data, 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)
{
if (avctx->channels < 1 || avctx->channels > 2) {
av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n");
return AVERROR_INVALIDDATA;
}
avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
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, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
AVFrame *frame = data;
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->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->channels * (bits + 1));
if (unp_size % (avctx->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;
}
AVCodec ff_smacker_decoder = {
.name = "smackvid",
.long_name = NULL_IF_CONFIG_SMALL("Smacker video"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_SMACKVIDEO,
.priv_data_size = sizeof(SmackVContext),
.init = decode_init,
.close = decode_end,
.decode = decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP | FF_CODEC_CAP_INIT_THREADSAFE,
};
AVCodec ff_smackaud_decoder = {
.name = "smackaud",
.long_name = NULL_IF_CONFIG_SMALL("Smacker audio"),
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_SMACKAUDIO,
.init = smka_decode_init,
.decode = smka_decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
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