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FFmpeg/libavcodec/lcldec.c

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/*
* LCL (LossLess Codec Library) Codec
* Copyright (c) 2002-2004 Roberto Togni
*
* 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
* LCL (LossLess Codec Library) Video Codec
* Decoder for MSZH and ZLIB codecs
* Experimental encoder for ZLIB RGB24
*
* Fourcc: MSZH, ZLIB
*
* Original Win32 dll:
* Ver2.23 By Kenji Oshima 2000.09.20
* avimszh.dll, avizlib.dll
*
* A description of the decoding algorithm can be found here:
* http://www.pcisys.net/~melanson/codecs
*
* Supports: BGR24 (RGB 24bpp)
*/
#include <stdio.h>
#include <stdlib.h>
#include "libavutil/mem.h"
#include "libavutil/pixdesc.h"
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
#include "lcl.h"
#if CONFIG_ZLIB_DECODER
#include <zlib.h>
#endif
typedef struct LclDecContext {
// Image type
int imgtype;
// Compression type
int compression;
// Flags
int flags;
// Decompressed data size
unsigned int decomp_size;
// Decompression buffer
unsigned char* decomp_buf;
#if CONFIG_ZLIB_DECODER
z_stream zstream;
#endif
} LclDecContext;
/**
* @param srcptr compressed source buffer, must be padded with at least 5 extra bytes
* @param destptr must be padded sufficiently for av_memcpy_backptr
*/
static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
{
unsigned char *destptr_bak = destptr;
unsigned char *destptr_end = destptr + destsize;
const unsigned char *srcptr_end = srcptr + srclen;
unsigned mask = *srcptr++;
unsigned maskbit = 0x80;
while (srcptr < srcptr_end && destptr < destptr_end) {
if (!(mask & maskbit)) {
memcpy(destptr, srcptr, 4);
destptr += 4;
srcptr += 4;
} else {
unsigned ofs = bytestream_get_le16(&srcptr);
unsigned cnt = (ofs >> 11) + 1;
ofs &= 0x7ff;
ofs = FFMIN(ofs, destptr - destptr_bak);
cnt *= 4;
cnt = FFMIN(cnt, destptr_end - destptr);
if (ofs) {
av_memcpy_backptr(destptr, ofs, cnt);
} else {
// Not known what the correct behaviour is, but
// this at least avoids uninitialized data.
memset(destptr, 0, cnt);
}
destptr += cnt;
}
maskbit >>= 1;
if (!maskbit) {
mask = *srcptr++;
while (!mask) {
if (destptr_end - destptr < 32 || srcptr_end - srcptr < 32) break;
memcpy(destptr, srcptr, 32);
destptr += 32;
srcptr += 32;
mask = *srcptr++;
}
maskbit = 0x80;
}
}
return destptr - destptr_bak;
}
#if CONFIG_ZLIB_DECODER
/**
* @brief decompress a zlib-compressed data block into decomp_buf
* @param src compressed input buffer
* @param src_len data length in input buffer
* @param offset offset in decomp_buf
* @param expected expected decompressed length
*/
static int zlib_decomp(AVCodecContext *avctx, const uint8_t *src, int src_len, int offset, int expected)
{
LclDecContext *c = avctx->priv_data;
int zret = inflateReset(&c->zstream);
if (zret != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
return AVERROR_UNKNOWN;
}
c->zstream.next_in = (uint8_t *)src;
c->zstream.avail_in = src_len;
c->zstream.next_out = c->decomp_buf + offset;
c->zstream.avail_out = c->decomp_size - offset;
zret = inflate(&c->zstream, Z_FINISH);
if (zret != Z_OK && zret != Z_STREAM_END) {
av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
return AVERROR_UNKNOWN;
}
if (expected != (unsigned int)c->zstream.total_out) {
av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
expected, c->zstream.total_out);
return AVERROR_UNKNOWN;
}
return c->zstream.total_out;
}
#endif
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
{
AVFrame *frame = data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
LclDecContext * const c = avctx->priv_data;
unsigned int pixel_ptr;
int row, col;
unsigned char *encoded = avpkt->data, *outptr;
uint8_t *y_out, *u_out, *v_out;
unsigned int width = avctx->width; // Real image width
unsigned int height = avctx->height; // Real image height
unsigned int mszh_dlen;
unsigned char yq, y1q, uq, vq;
int uqvq, ret;
unsigned int mthread_inlen, mthread_outlen;
unsigned int len = buf_size;
int linesize;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
outptr = frame->data[0]; // Output image pointer
/* Decompress frame */
switch (avctx->codec_id) {
case AV_CODEC_ID_MSZH:
switch (c->compression) {
case COMP_MSZH:
if (c->imgtype == IMGTYPE_RGB24 && len == FFALIGN(width * 3, 4) * height ||
c->imgtype == IMGTYPE_YUV111 && len == width * height * 3) {
;
} else if (c->flags & FLAG_MULTITHREAD) {
mthread_inlen = AV_RL32(buf);
if (len < 8) {
av_log(avctx, AV_LOG_ERROR, "len %d is too small\n", len);
return AVERROR_INVALIDDATA;
}
mthread_inlen = FFMIN(mthread_inlen, len - 8);
mthread_outlen = AV_RL32(buf + 4);
mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
mszh_dlen = mszh_decomp(buf + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
if (mthread_outlen != mszh_dlen) {
av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
mthread_outlen, mszh_dlen);
return AVERROR_INVALIDDATA;
}
mszh_dlen = mszh_decomp(buf + 8 + mthread_inlen, len - 8 - mthread_inlen,
c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
if (mthread_outlen != mszh_dlen) {
av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
mthread_outlen, mszh_dlen);
return AVERROR_INVALIDDATA;
}
encoded = c->decomp_buf;
len = c->decomp_size;
} else {
mszh_dlen = mszh_decomp(buf, len, c->decomp_buf, c->decomp_size);
if (c->decomp_size != mszh_dlen) {
av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
c->decomp_size, mszh_dlen);
return AVERROR_INVALIDDATA;
}
encoded = c->decomp_buf;
len = mszh_dlen;
}
break;
case COMP_MSZH_NOCOMP: {
int bppx2;
switch (c->imgtype) {
case IMGTYPE_YUV111:
case IMGTYPE_RGB24:
bppx2 = 6;
break;
case IMGTYPE_YUV422:
case IMGTYPE_YUV211:
bppx2 = 4;
break;
case IMGTYPE_YUV411:
case IMGTYPE_YUV420:
bppx2 = 3;
break;
default:
bppx2 = 0; // will error out below
break;
}
if (len < ((width * height * bppx2) >> 1))
return AVERROR_INVALIDDATA;
break;
}
default:
av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
return AVERROR_INVALIDDATA;
}
break;
#if CONFIG_ZLIB_DECODER
case AV_CODEC_ID_ZLIB:
/* Using the original dll with normal compression (-1) and RGB format
* gives a file with ZLIB fourcc, but frame is really uncompressed.
* To be sure that's true check also frame size */
if (c->compression == COMP_ZLIB_NORMAL && c->imgtype == IMGTYPE_RGB24 &&
len == width * height * 3) {
if (c->flags & FLAG_PNGFILTER) {
memcpy(c->decomp_buf, buf, len);
encoded = c->decomp_buf;
} else {
break;
}
} else if (c->flags & FLAG_MULTITHREAD) {
mthread_inlen = AV_RL32(buf);
mthread_inlen = FFMIN(mthread_inlen, len - 8);
mthread_outlen = AV_RL32(buf + 4);
mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
ret = zlib_decomp(avctx, buf + 8, mthread_inlen, 0, mthread_outlen);
if (ret < 0) return ret;
ret = zlib_decomp(avctx, buf + 8 + mthread_inlen, len - 8 - mthread_inlen,
mthread_outlen, mthread_outlen);
if (ret < 0) return ret;
} else {
int ret = zlib_decomp(avctx, buf, len, 0, c->decomp_size);
if (ret < 0) return ret;
}
encoded = c->decomp_buf;
len = c->decomp_size;
break;
#endif
default:
av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
return AVERROR_INVALIDDATA;
}
/* Apply PNG filter */
if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) {
switch (c->imgtype) {
case IMGTYPE_YUV111:
case IMGTYPE_RGB24:
for (row = 0; row < height; row++) {
pixel_ptr = row * width * 3;
yq = encoded[pixel_ptr++];
uqvq = AV_RL16(encoded+pixel_ptr);
pixel_ptr += 2;
for (col = 1; col < width; col++) {
encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
uqvq -= AV_RL16(encoded+pixel_ptr+1);
AV_WL16(encoded+pixel_ptr+1, uqvq);
pixel_ptr += 3;
}
}
break;
case IMGTYPE_YUV422:
for (row = 0; row < height; row++) {
pixel_ptr = row * width * 2;
yq = uq = vq =0;
for (col = 0; col < width/4; col++) {
encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
pixel_ptr += 8;
}
}
break;
case IMGTYPE_YUV411:
for (row = 0; row < height; row++) {
pixel_ptr = row * width / 2 * 3;
yq = uq = vq =0;
for (col = 0; col < width/4; col++) {
encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
pixel_ptr += 6;
}
}
break;
case IMGTYPE_YUV211:
for (row = 0; row < height; row++) {
pixel_ptr = row * width * 2;
yq = uq = vq =0;
for (col = 0; col < width/2; col++) {
encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
pixel_ptr += 4;
}
}
break;
case IMGTYPE_YUV420:
for (row = 0; row < height/2; row++) {
pixel_ptr = row * width * 3;
yq = y1q = uq = vq =0;
for (col = 0; col < width/2; col++) {
encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
pixel_ptr += 6;
}
}
break;
default:
av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
return AVERROR_INVALIDDATA;
}
}
/* Convert colorspace */
y_out = frame->data[0] + (height - 1) * frame->linesize[0];
u_out = frame->data[1] + (height - 1) * frame->linesize[1];
v_out = frame->data[2] + (height - 1) * frame->linesize[2];
switch (c->imgtype) {
case IMGTYPE_YUV111:
for (row = 0; row < height; row++) {
for (col = 0; col < width; col++) {
y_out[col] = *encoded++;
u_out[col] = *encoded++ + 128;
v_out[col] = *encoded++ + 128;
}
y_out -= frame->linesize[0];
u_out -= frame->linesize[1];
v_out -= frame->linesize[2];
}
break;
case IMGTYPE_YUV422:
for (row = 0; row < height; row++) {
for (col = 0; col < width - 3; col += 4) {
memcpy(y_out + col, encoded, 4);
encoded += 4;
u_out[ col >> 1 ] = *encoded++ + 128;
u_out[(col >> 1) + 1] = *encoded++ + 128;
v_out[ col >> 1 ] = *encoded++ + 128;
v_out[(col >> 1) + 1] = *encoded++ + 128;
}
y_out -= frame->linesize[0];
u_out -= frame->linesize[1];
v_out -= frame->linesize[2];
}
break;
case IMGTYPE_RGB24:
linesize = len < FFALIGN(3 * width, 4) * height ? 3 * width : FFALIGN(3 * width, 4);
for (row = height - 1; row >= 0; row--) {
pixel_ptr = row * frame->linesize[0];
memcpy(outptr + pixel_ptr, encoded, 3 * width);
encoded += linesize;
}
break;
case IMGTYPE_YUV411:
for (row = 0; row < height; row++) {
for (col = 0; col < width - 3; col += 4) {
memcpy(y_out + col, encoded, 4);
encoded += 4;
u_out[col >> 2] = *encoded++ + 128;
v_out[col >> 2] = *encoded++ + 128;
}
y_out -= frame->linesize[0];
u_out -= frame->linesize[1];
v_out -= frame->linesize[2];
}
break;
case IMGTYPE_YUV211:
for (row = 0; row < height; row++) {
for (col = 0; col < width - 1; col += 2) {
memcpy(y_out + col, encoded, 2);
encoded += 2;
u_out[col >> 1] = *encoded++ + 128;
v_out[col >> 1] = *encoded++ + 128;
}
y_out -= frame->linesize[0];
u_out -= frame->linesize[1];
v_out -= frame->linesize[2];
}
break;
case IMGTYPE_YUV420:
u_out = frame->data[1] + ((height >> 1) - 1) * frame->linesize[1];
v_out = frame->data[2] + ((height >> 1) - 1) * frame->linesize[2];
for (row = 0; row < height - 1; row += 2) {
for (col = 0; col < width - 1; col += 2) {
memcpy(y_out + col, encoded, 2);
encoded += 2;
memcpy(y_out + col - frame->linesize[0], encoded, 2);
encoded += 2;
u_out[col >> 1] = *encoded++ + 128;
v_out[col >> 1] = *encoded++ + 128;
}
y_out -= frame->linesize[0] << 1;
u_out -= frame->linesize[1];
v_out -= frame->linesize[2];
}
break;
default:
av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
return AVERROR_INVALIDDATA;
}
*got_frame = 1;
/* always report that the buffer was completely consumed */
return buf_size;
}
static av_cold int decode_init(AVCodecContext *avctx)
{
LclDecContext * const c = avctx->priv_data;
unsigned int basesize = avctx->width * avctx->height;
unsigned int max_basesize = FFALIGN(avctx->width, 4) *
FFALIGN(avctx->height, 4);
unsigned int max_decomp_size;
int subsample_h, subsample_v;
if (avctx->extradata_size < 8) {
av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
return AVERROR_INVALIDDATA;
}
/* Check codec type */
if ((avctx->codec_id == AV_CODEC_ID_MSZH && avctx->extradata[7] != CODEC_MSZH) ||
(avctx->codec_id == AV_CODEC_ID_ZLIB && avctx->extradata[7] != CODEC_ZLIB)) {
av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
}
/* Detect image type */
switch (c->imgtype = avctx->extradata[4]) {
case IMGTYPE_YUV111:
c->decomp_size = basesize * 3;
max_decomp_size = max_basesize * 3;
avctx->pix_fmt = AV_PIX_FMT_YUV444P;
av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 1:1:1.\n");
break;
case IMGTYPE_YUV422:
c->decomp_size = basesize * 2;
max_decomp_size = max_basesize * 2;
avctx->pix_fmt = AV_PIX_FMT_YUV422P;
av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n");
if (avctx->width % 4) {
avpriv_request_sample(avctx, "Unsupported dimensions");
return AVERROR_INVALIDDATA;
}
break;
case IMGTYPE_RGB24:
c->decomp_size = basesize * 3;
max_decomp_size = max_basesize * 3;
avctx->pix_fmt = AV_PIX_FMT_BGR24;
av_log(avctx, AV_LOG_DEBUG, "Image type is RGB 24.\n");
break;
case IMGTYPE_YUV411:
c->decomp_size = basesize / 2 * 3;
max_decomp_size = max_basesize / 2 * 3;
avctx->pix_fmt = AV_PIX_FMT_YUV411P;
av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:1:1.\n");
break;
case IMGTYPE_YUV211:
c->decomp_size = basesize * 2;
max_decomp_size = max_basesize * 2;
avctx->pix_fmt = AV_PIX_FMT_YUV422P;
av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 2:1:1.\n");
break;
case IMGTYPE_YUV420:
c->decomp_size = basesize / 2 * 3;
max_decomp_size = max_basesize / 2 * 3;
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:0.\n");
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
return AVERROR_INVALIDDATA;
}
av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &subsample_h, &subsample_v);
if (avctx->width % (1<<subsample_h) || avctx->height % (1<<subsample_v)) {
avpriv_request_sample(avctx, "Unsupported dimensions");
return AVERROR_INVALIDDATA;
}
/* Detect compression method */
c->compression = (int8_t)avctx->extradata[5];
switch (avctx->codec_id) {
case AV_CODEC_ID_MSZH:
switch (c->compression) {
case COMP_MSZH:
av_log(avctx, AV_LOG_DEBUG, "Compression enabled.\n");
break;
case COMP_MSZH_NOCOMP:
c->decomp_size = 0;
av_log(avctx, AV_LOG_DEBUG, "No compression.\n");
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
return AVERROR_INVALIDDATA;
}
break;
#if CONFIG_ZLIB_DECODER
case AV_CODEC_ID_ZLIB:
switch (c->compression) {
case COMP_ZLIB_HISPEED:
av_log(avctx, AV_LOG_DEBUG, "High speed compression.\n");
break;
case COMP_ZLIB_HICOMP:
av_log(avctx, AV_LOG_DEBUG, "High compression.\n");
break;
case COMP_ZLIB_NORMAL:
av_log(avctx, AV_LOG_DEBUG, "Normal compression.\n");
break;
default:
if (c->compression < Z_NO_COMPRESSION || c->compression > Z_BEST_COMPRESSION) {
av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
return AVERROR_INVALIDDATA;
}
av_log(avctx, AV_LOG_DEBUG, "Compression level for ZLIB: (%d).\n", c->compression);
}
break;
#endif
default:
av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
return AVERROR_INVALIDDATA;
}
/* Allocate decompression buffer */
if (c->decomp_size) {
if (!(c->decomp_buf = av_malloc(max_decomp_size))) {
av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
return AVERROR(ENOMEM);
}
}
/* Detect flags */
c->flags = avctx->extradata[6];
if (c->flags & FLAG_MULTITHREAD)
av_log(avctx, AV_LOG_DEBUG, "Multithread encoder flag set.\n");
if (c->flags & FLAG_NULLFRAME)
av_log(avctx, AV_LOG_DEBUG, "Nullframe insertion flag set.\n");
if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER))
av_log(avctx, AV_LOG_DEBUG, "PNG filter flag set.\n");
if (c->flags & FLAGMASK_UNUSED)
av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
/* If needed init zlib */
#if CONFIG_ZLIB_DECODER
if (avctx->codec_id == AV_CODEC_ID_ZLIB) {
int zret;
c->zstream.zalloc = Z_NULL;
c->zstream.zfree = Z_NULL;
c->zstream.opaque = Z_NULL;
zret = inflateInit(&c->zstream);
if (zret != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
av_freep(&c->decomp_buf);
return AVERROR_UNKNOWN;
}
}
#endif
return 0;
}
static av_cold int decode_end(AVCodecContext *avctx)
{
LclDecContext * const c = avctx->priv_data;
av_freep(&c->decomp_buf);
#if CONFIG_ZLIB_DECODER
if (avctx->codec_id == AV_CODEC_ID_ZLIB)
inflateEnd(&c->zstream);
#endif
return 0;
}
#if CONFIG_MSZH_DECODER
AVCodec ff_mszh_decoder = {
.name = "mszh",
.long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_MSZH,
.priv_data_size = sizeof(LclDecContext),
.init = decode_init,
.close = decode_end,
.decode = decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
#endif
#if CONFIG_ZLIB_DECODER
AVCodec ff_zlib_decoder = {
.name = "zlib",
.long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_ZLIB,
.priv_data_size = sizeof(LclDecContext),
.init = decode_init,
.close = decode_end,
.decode = decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
#endif