lclenc.c 5.1 KB
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/*
 * LCL (LossLess Codec Library) Codec
 * Copyright (c) 2002-2004 Roberto Togni
 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * 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.
 *
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 * Libav is distributed in the hope that it will be useful,
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 * 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
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
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 * @file
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 * 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"
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#include "internal.h"
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#include "lcl.h"
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#include "libavutil/internal.h"
#include "libavutil/mem.h"
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#include <zlib.h>

/*
 * Decoder context
 */
typedef struct LclEncContext {

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    AVCodecContext *avctx;
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    // Image type
    int imgtype;
    // Compression type
    int compression;
    // Flags
    int flags;
    z_stream zstream;
} LclEncContext;

/*
 *
 * Encode a frame
 *
 */
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static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                        const AVFrame *pict, int *got_packet)
{
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    LclEncContext *c = avctx->priv_data;
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    const AVFrame * const p = pict;
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    int i, ret;
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    int zret; // Zlib return code
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    int max_size = deflateBound(&c->zstream, avctx->width * avctx->height * 3);

    if (!pkt->data &&
        (ret = av_new_packet(pkt, max_size)) < 0) {
            av_log(avctx, AV_LOG_ERROR, "Error allocating packet of size %d.\n", max_size);
            return ret;
    }
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    if(avctx->pix_fmt != AV_PIX_FMT_BGR24){
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        av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
        return -1;
    }

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    zret = deflateReset(&c->zstream);
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    if (zret != Z_OK) {
        av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
        return -1;
    }
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    c->zstream.next_out  = pkt->data;
    c->zstream.avail_out = pkt->size;
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    for(i = avctx->height - 1; i >= 0; i--) {
        c->zstream.next_in = p->data[0]+p->linesize[0]*i;
        c->zstream.avail_in = avctx->width*3;
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        zret = deflate(&c->zstream, Z_NO_FLUSH);
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        if (zret != Z_OK) {
            av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
            return -1;
        }
    }
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    zret = deflate(&c->zstream, Z_FINISH);
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    if (zret != Z_STREAM_END) {
        av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
        return -1;
    }

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    pkt->size   = c->zstream.total_out;
    pkt->flags |= AV_PKT_FLAG_KEY;
    *got_packet = 1;

    return 0;
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}

/*
 *
 * Init lcl encoder
 *
 */
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static av_cold int encode_init(AVCodecContext *avctx)
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{
    LclEncContext *c = avctx->priv_data;
    int zret; // Zlib return code

    c->avctx= avctx;

    assert(avctx->width && avctx->height);

    avctx->extradata= av_mallocz(8);
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    if (!avctx->extradata)
        return AVERROR(ENOMEM);
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#if FF_API_CODED_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
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    avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
    avctx->coded_frame->key_frame = 1;
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FF_ENABLE_DEPRECATION_WARNINGS
#endif
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    // Will be user settable someday
    c->compression = 6;
    c->flags = 0;
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    c->imgtype = IMGTYPE_RGB24;
    avctx->bits_per_coded_sample= 24;
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    avctx->extradata[0]= 4;
    avctx->extradata[1]= 0;
    avctx->extradata[2]= 0;
    avctx->extradata[3]= 0;
    avctx->extradata[4]= c->imgtype;
    avctx->extradata[5]= c->compression;
    avctx->extradata[6]= c->flags;
    avctx->extradata[7]= CODEC_ZLIB;
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    c->avctx->extradata_size= 8;

    c->zstream.zalloc = Z_NULL;
    c->zstream.zfree = Z_NULL;
    c->zstream.opaque = Z_NULL;
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    zret = deflateInit(&c->zstream, c->compression);
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    if (zret != Z_OK) {
        av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
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        return AVERROR_UNKNOWN;
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    }

    return 0;
}

/*
 *
 * Uninit lcl encoder
 *
 */
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static av_cold int encode_end(AVCodecContext *avctx)
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{
    LclEncContext *c = avctx->priv_data;

    av_freep(&avctx->extradata);
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    deflateEnd(&c->zstream);
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    return 0;
}

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AVCodec ff_zlib_encoder = {
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    .name           = "zlib",
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    .long_name      = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
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    .type           = AVMEDIA_TYPE_VIDEO,
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    .id             = AV_CODEC_ID_ZLIB,
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    .priv_data_size = sizeof(LclEncContext),
    .init           = encode_init,
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    .encode2        = encode_frame,
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    .close          = encode_end,
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    .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },
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    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE |
                      FF_CODEC_CAP_INIT_CLEANUP,
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};