PeerStreamer

/*

 * 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 libavcodec/lcldec.c

 * 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 "avcodec.h"

#include "get_bits.h"

#include "lcl.h"

#if CONFIG_ZLIB

#include <zlib.h>

#endif

/*

 * Decoder context

 */

typedef struct LclDecContext {

    AVFrame pic;

    // 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

    z_stream zstream;

#endif

} LclDecContext;

/*

 *

 * Helper functions

 *

 */

static inline unsigned char fix (int pix14)

{

    int tmp;

    tmp = (pix14 + 0x80000) >> 20;

    if (tmp < 0)

        return 0;

    if (tmp > 255)

        return 255;

    return tmp;

}

static inline unsigned char get_b (unsigned char yq, signed char bq)

{

    return fix((yq << 20) + bq * 1858076);

}

static inline unsigned char get_g (unsigned char yq, signed char bq, signed char rq)

{

    return fix((yq << 20) - bq * 360857 - rq * 748830);

}

static inline unsigned char get_r (unsigned char yq, signed char rq)

{

    return fix((yq << 20) + rq * 1470103);

}

static unsigned int mszh_decomp(unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)

{

    unsigned char *destptr_bak = destptr;

    unsigned char *destptr_end = destptr + destsize;

    unsigned char mask = 0;

    unsigned char maskbit = 0;

    unsigned int ofs, cnt;

    while ((srclen > 0) && (destptr < destptr_end)) {

        if (maskbit == 0) {

            mask = *(srcptr++);

            maskbit = 8;

            srclen--;

            continue;

        }

        if ((mask & (1 << (--maskbit))) == 0) {

            if (destptr + 4 > destptr_end)

                break;

            *(int*)destptr = *(int*)srcptr;

            srclen -= 4;

            destptr += 4;

            srcptr += 4;

        } else {

            ofs = *(srcptr++);

            cnt = *(srcptr++);

            ofs += cnt * 256;

            cnt = ((cnt >> 3) & 0x1f) + 1;

            ofs &= 0x7ff;

            srclen -= 2;

            cnt *= 4;

            if (destptr + cnt > destptr_end) {

                cnt =  destptr_end - destptr;

            }

            for (; cnt > 0; cnt--) {

                *(destptr) = *(destptr - ofs);

                destptr++;

            }

        }

    }

    return (destptr - destptr_bak);

}

/*

 *

 * Decode a frame

 *

 */

static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)

{

    const uint8_t *buf = avpkt->data;

    int buf_size = avpkt->size;

    LclDecContext * const c = avctx->priv_data;

    unsigned char *encoded = (unsigned char *)buf;

    unsigned int pixel_ptr;

    int row, col;

    unsigned char *outptr;

    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;

    unsigned int mthread_inlen, mthread_outlen;

#if CONFIG_ZLIB

    int zret; // Zlib return code

#endif

    unsigned int len = buf_size;

    if(c->pic.data[0])

        avctx->release_buffer(avctx, &c->pic);

    c->pic.reference = 0;

    c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;

    if(avctx->get_buffer(avctx, &c->pic) < 0){

        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

        return -1;

    }

    outptr = c->pic.data[0]; // Output image pointer

    /* Decompress frame */

    switch (avctx->codec_id) {

    case CODEC_ID_MSZH:

        switch (c->compression) {

        case COMP_MSZH:

            if (c->flags & FLAG_MULTITHREAD) {

                mthread_inlen = *((unsigned int*)encoded);

                mthread_outlen = *((unsigned int*)(encoded+4));

                if (mthread_outlen > c->decomp_size) // this should not happen

                    mthread_outlen = c->decomp_size;

                mszh_dlen = mszh_decomp(encoded + 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 -1;

                }

                mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - 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 -1;

                }

                encoded = c->decomp_buf;

                len = c->decomp_size;

            } else {

                mszh_dlen = mszh_decomp(encoded, 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 -1;

                }

                encoded = c->decomp_buf;

                len = mszh_dlen;

            }

            break;

        case COMP_MSZH_NOCOMP:

            break;

        default:

            av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");

            return -1;

        }

        break;

    case CODEC_ID_ZLIB:

#if CONFIG_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))

            break;

        zret = inflateReset(&(c->zstream));

        if (zret != Z_OK) {

            av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);

            return -1;

        }

        if (c->flags & FLAG_MULTITHREAD) {

            mthread_inlen = *((unsigned int*)encoded);

            mthread_outlen = *((unsigned int*)(encoded+4));

            if (mthread_outlen > c->decomp_size)

                mthread_outlen = c->decomp_size;

            c->zstream.next_in = encoded + 8;

            c->zstream.avail_in = mthread_inlen;

            c->zstream.next_out = c->decomp_buf;

            c->zstream.avail_out = c->decomp_size;

            zret = inflate(&(c->zstream), Z_FINISH);

            if ((zret != Z_OK) && (zret != Z_STREAM_END)) {

                av_log(avctx, AV_LOG_ERROR, "Mthread1 inflate error: %d\n", zret);

                return -1;

            }

            if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {

                av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%u != %lu)\n",

                       mthread_outlen, c->zstream.total_out);

                return -1;

            }

            zret = inflateReset(&(c->zstream));

            if (zret != Z_OK) {

                av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate reset error: %d\n", zret);

                return -1;

            }

            c->zstream.next_in = encoded + 8 + mthread_inlen;

            c->zstream.avail_in = len - mthread_inlen;

            c->zstream.next_out = c->decomp_buf + mthread_outlen;

            c->zstream.avail_out = c->decomp_size - mthread_outlen;

            zret = inflate(&(c->zstream), Z_FINISH);

            if ((zret != Z_OK) && (zret != Z_STREAM_END)) {

                av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate error: %d\n", zret);

                return -1;

            }

            if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {

                av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %lu)\n",

                       mthread_outlen, c->zstream.total_out);

                return -1;

            }

        } else {

            c->zstream.next_in = encoded;

            c->zstream.avail_in = len;

            c->zstream.next_out = c->decomp_buf;

            c->zstream.avail_out = c->decomp_size;

            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 -1;

            }

            if (c->decomp_size != (unsigned int)(c->zstream.total_out)) {

                av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",

                       c->decomp_size, c->zstream.total_out);

                return -1;

            }

        }

        encoded = c->decomp_buf;

        len = c->decomp_size;

#else

        av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");

        return -1;

#endif

        break;

    default:

        av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");

        return -1;

    }

    /* Apply PNG filter */

    if ((avctx->codec_id == 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 -1;

        }

    }

    /* Convert colorspace */

    switch (c->imgtype) {

    case IMGTYPE_YUV111:

        for (row = height - 1; row >= 0; row--) {

            pixel_ptr = row * c->pic.linesize[0];

            for (col = 0; col < width; col++) {

                outptr[pixel_ptr++] = get_b(encoded[0], encoded[1]);

                outptr[pixel_ptr++] = get_g(encoded[0], encoded[1], encoded[2]);

                outptr[pixel_ptr++] = get_r(encoded[0], encoded[2]);

                encoded += 3;

            }

        }

        break;

    case IMGTYPE_YUV422:

        for (row = height - 1; row >= 0; row--) {

            pixel_ptr = row * c->pic.linesize[0];

            for (col = 0; col < width/4; col++) {

                outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);

                outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[6]);

                outptr[pixel_ptr++] = get_r(encoded[0], encoded[6]);

                outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);

                outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[6]);

                outptr[pixel_ptr++] = get_r(encoded[1], encoded[6]);

                outptr[pixel_ptr++] = get_b(encoded[2], encoded[5]);

                outptr[pixel_ptr++] = get_g(encoded[2], encoded[5], encoded[7]);

                outptr[pixel_ptr++] = get_r(encoded[2], encoded[7]);

                outptr[pixel_ptr++] = get_b(encoded[3], encoded[5]);

                outptr[pixel_ptr++] = get_g(encoded[3], encoded[5], encoded[7]);

                outptr[pixel_ptr++] = get_r(encoded[3], encoded[7]);

                encoded += 8;

            }

        }

        break;

    case IMGTYPE_RGB24:

        for (row = height - 1; row >= 0; row--) {

            pixel_ptr = row * c->pic.linesize[0];

            for (col = 0; col < width; col++) {

                outptr[pixel_ptr++] = encoded[0];

                outptr[pixel_ptr++] = encoded[1];

                outptr[pixel_ptr++] = encoded[2];

                encoded += 3;

            }

        }

        break;

    case IMGTYPE_YUV411:

        for (row = height - 1; row >= 0; row--) {

            pixel_ptr = row * c->pic.linesize[0];

            for (col = 0; col < width/4; col++) {

                outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);

                outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[5]);

                outptr[pixel_ptr++] = get_r(encoded[0], encoded[5]);

                outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);

                outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[5]);

                outptr[pixel_ptr++] = get_r(encoded[1], encoded[5]);

                outptr[pixel_ptr++] = get_b(encoded[2], encoded[4]);

                outptr[pixel_ptr++] = get_g(encoded[2], encoded[4], encoded[5]);

                outptr[pixel_ptr++] = get_r(encoded[2], encoded[5]);

                outptr[pixel_ptr++] = get_b(encoded[3], encoded[4]);

                outptr[pixel_ptr++] = get_g(encoded[3], encoded[4], encoded[5]);

                outptr[pixel_ptr++] = get_r(encoded[3], encoded[5]);

                encoded += 6;

            }

        }

        break;

    case IMGTYPE_YUV211:

        for (row = height - 1; row >= 0; row--) {

            pixel_ptr = row * c->pic.linesize[0];

            for (col = 0; col < width/2; col++) {

                outptr[pixel_ptr++] = get_b(encoded[0], encoded[2]);

                outptr[pixel_ptr++] = get_g(encoded[0], encoded[2], encoded[3]);

                outptr[pixel_ptr++] = get_r(encoded[0], encoded[3]);

                outptr[pixel_ptr++] = get_b(encoded[1], encoded[2]);

                outptr[pixel_ptr++] = get_g(encoded[1], encoded[2], encoded[3]);

                outptr[pixel_ptr++] = get_r(encoded[1], encoded[3]);

                encoded += 4;

            }

        }

        break;

    case IMGTYPE_YUV420:

        for (row = height / 2 - 1; row >= 0; row--) {

            pixel_ptr = 2 * row * c->pic.linesize[0];

            for (col = 0; col < width/2; col++) {

                outptr[pixel_ptr] = get_b(encoded[0], encoded[4]);

                outptr[pixel_ptr+1] = get_g(encoded[0], encoded[4], encoded[5]);

                outptr[pixel_ptr+2] = get_r(encoded[0], encoded[5]);

                outptr[pixel_ptr+3] = get_b(encoded[1], encoded[4]);

                outptr[pixel_ptr+4] = get_g(encoded[1], encoded[4], encoded[5]);

                outptr[pixel_ptr+5] = get_r(encoded[1], encoded[5]);

                outptr[pixel_ptr-c->pic.linesize[0]] = get_b(encoded[2], encoded[4]);

                outptr[pixel_ptr-c->pic.linesize[0]+1] = get_g(encoded[2], encoded[4], encoded[5]);

                outptr[pixel_ptr-c->pic.linesize[0]+2] = get_r(encoded[2], encoded[5]);

                outptr[pixel_ptr-c->pic.linesize[0]+3] = get_b(encoded[3], encoded[4]);

                outptr[pixel_ptr-c->pic.linesize[0]+4] = get_g(encoded[3], encoded[4], encoded[5]);

                outptr[pixel_ptr-c->pic.linesize[0]+5] = get_r(encoded[3], encoded[5]);

                pixel_ptr += 6;

                encoded += 6;

            }

        }

        break;

    default:

        av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");

        return -1;

    }

    *data_size = sizeof(AVFrame);

    *(AVFrame*)data = c->pic;

    /* always report that the buffer was completely consumed */

    return buf_size;

}

/*

 *

 * Init lcl decoder

 *

 */

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 = ((avctx->width + 3) & ~3) * ((avctx->height + 3) & ~3);

    unsigned int max_decomp_size;

    int zret; // Zlib return code

    c->pic.data[0] = NULL;

#if CONFIG_ZLIB

    // Needed if zlib unused or init aborted before inflateInit

    memset(&(c->zstream), 0, sizeof(z_stream));

#endif

    if (avctx->extradata_size < 8) {

        av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");

        return 1;

    }

    if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {

        return 1;

    }

    /* Check codec type */

    if (((avctx->codec_id == CODEC_ID_MSZH)  && (*((char *)avctx->extradata + 7) != CODEC_MSZH)) ||

        ((avctx->codec_id == CODEC_ID_ZLIB)  && (*((char *)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 = *((char *)avctx->extradata + 4)) {

    case IMGTYPE_YUV111:

        c->decomp_size = basesize * 3;

        max_decomp_size = max_basesize * 3;

        av_log(avctx, AV_LOG_INFO, "Image type is YUV 1:1:1.\n");

        break;

    case IMGTYPE_YUV422:

        c->decomp_size = basesize * 2;

        max_decomp_size = max_basesize * 2;

        av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:2.\n");

        break;

    case IMGTYPE_RGB24:

        c->decomp_size = basesize * 3;

        max_decomp_size = max_basesize * 3;

        av_log(avctx, AV_LOG_INFO, "Image type is RGB 24.\n");

        break;

    case IMGTYPE_YUV411:

        c->decomp_size = basesize / 2 * 3;

        max_decomp_size = max_basesize / 2 * 3;

        av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:1:1.\n");

        break;

    case IMGTYPE_YUV211:

        c->decomp_size = basesize * 2;

        max_decomp_size = max_basesize * 2;

        av_log(avctx, AV_LOG_INFO, "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;

        av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:0.\n");

        break;

    default:

        av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);

        return 1;

    }

    /* Detect compression method */

    c->compression = *((char *)avctx->extradata + 5);

    switch (avctx->codec_id) {

    case CODEC_ID_MSZH:

        switch (c->compression) {

        case COMP_MSZH:

            av_log(avctx, AV_LOG_INFO, "Compression enabled.\n");

            break;

        case COMP_MSZH_NOCOMP:

            c->decomp_size = 0;

            av_log(avctx, AV_LOG_INFO, "No compression.\n");

            break;

        default:

            av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);

            return 1;

        }

        break;

    case CODEC_ID_ZLIB:

#if CONFIG_ZLIB

        switch (c->compression) {

        case COMP_ZLIB_HISPEED:

            av_log(avctx, AV_LOG_INFO, "High speed compression.\n");

            break;

        case COMP_ZLIB_HICOMP:

            av_log(avctx, AV_LOG_INFO, "High compression.\n");

            break;

        case COMP_ZLIB_NORMAL:

            av_log(avctx, AV_LOG_INFO, "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 1;

            }

            av_log(avctx, AV_LOG_INFO, "Compression level for ZLIB: (%d).\n", c->compression);

        }

#else

        av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");

        return 1;

#endif

        break;

    default:

        av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");

        return 1;

    }

    /* Allocate decompression buffer */

    if (c->decomp_size) {

        if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {

            av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");

            return 1;

        }

    }

    /* Detect flags */

    c->flags = *((char *)avctx->extradata + 6);

    if (c->flags & FLAG_MULTITHREAD)

        av_log(avctx, AV_LOG_INFO, "Multithread encoder flag set.\n");

    if (c->flags & FLAG_NULLFRAME)

        av_log(avctx, AV_LOG_INFO, "Nullframe insertion flag set.\n");

    if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER))

        av_log(avctx, AV_LOG_INFO, "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 (avctx->codec_id == CODEC_ID_ZLIB) {

#if CONFIG_ZLIB

        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);

            return 1;

        }

#else

        av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");

        return 1;

#endif

    }

    avctx->pix_fmt = PIX_FMT_BGR24;

    return 0;

}

/*

 *

 * Uninit lcl decoder

 *

 */

static av_cold int decode_end(AVCodecContext *avctx)

{

    LclDecContext * const c = avctx->priv_data;

    if (c->pic.data[0])

        avctx->release_buffer(avctx, &c->pic);

#if CONFIG_ZLIB

    inflateEnd(&(c->zstream));

#endif

    return 0;

}

#if CONFIG_MSZH_DECODER

AVCodec mszh_decoder = {

    "mszh",

    CODEC_TYPE_VIDEO,

    CODEC_ID_MSZH,

    sizeof(LclDecContext),

    decode_init,

    NULL,

    decode_end,

    decode_frame,

    CODEC_CAP_DR1,

    .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),

};

#endif

#if CONFIG_ZLIB_DECODER

AVCodec zlib_decoder = {

    "zlib",

    CODEC_TYPE_VIDEO,

    CODEC_ID_ZLIB,

    sizeof(LclDecContext),

    decode_init,

    NULL,

    decode_end,

    decode_frame,

    CODEC_CAP_DR1,

    .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),

};

#endif