lclenc.c 4.94 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
/*
 * 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
 */

/**
23
 * @file
24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
 * 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>

44
#include "libavutil/avassert.h"
45
#include "avcodec.h"
46
#include "internal.h"
47
#include "lcl.h"
48 49
#include "libavutil/internal.h"
#include "libavutil/mem.h"
50 51 52 53 54 55 56 57

#include <zlib.h>

/*
 * Decoder context
 */
typedef struct LclEncContext {

58 59
    AVCodecContext *avctx;
    AVFrame pic;
60 61 62 63 64 65 66 67 68 69 70 71 72 73 74

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

/*
 *
 * Encode a frame
 *
 */
75 76 77
static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                        const AVFrame *pict, int *got_packet)
{
78 79
    LclEncContext *c = avctx->priv_data;
    AVFrame * const p = &c->pic;
80
    int i, ret;
81
    int zret; // Zlib return code
82 83
    int max_size = deflateBound(&c->zstream, avctx->width * avctx->height * 3);

84
    if ((ret = ff_alloc_packet2(avctx, pkt, max_size)) < 0)
85
            return ret;
86 87

    *p = *pict;
88
    p->pict_type= AV_PICTURE_TYPE_I;
89 90
    p->key_frame= 1;

91
    if(avctx->pix_fmt != AV_PIX_FMT_BGR24){
92 93 94 95
        av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
        return -1;
    }

96
    zret = deflateReset(&c->zstream);
97 98 99 100
    if (zret != Z_OK) {
        av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
        return -1;
    }
101 102
    c->zstream.next_out  = pkt->data;
    c->zstream.avail_out = pkt->size;
103 104 105 106

    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;
107
        zret = deflate(&c->zstream, Z_NO_FLUSH);
108 109 110 111 112
        if (zret != Z_OK) {
            av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
            return -1;
        }
    }
113
    zret = deflate(&c->zstream, Z_FINISH);
114 115 116 117 118
    if (zret != Z_STREAM_END) {
        av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
        return -1;
    }

119 120 121 122 123
    pkt->size   = c->zstream.total_out;
    pkt->flags |= AV_PKT_FLAG_KEY;
    *got_packet = 1;

    return 0;
124 125 126 127 128 129 130
}

/*
 *
 * Init lcl encoder
 *
 */
131
static av_cold int encode_init(AVCodecContext *avctx)
132 133 134 135 136 137
{
    LclEncContext *c = avctx->priv_data;
    int zret; // Zlib return code

    c->avctx= avctx;

138
    av_assert0(avctx->width && avctx->height);
139 140 141 142

    avctx->extradata= av_mallocz(8);
    avctx->coded_frame= &c->pic;

143 144 145
    c->compression = avctx->compression_level == FF_COMPRESSION_DEFAULT ?
                            COMP_ZLIB_NORMAL :
                            av_clip(avctx->compression_level, 0, 9);
146
    c->flags = 0;
147 148
    c->imgtype = IMGTYPE_RGB24;
    avctx->bits_per_coded_sample= 24;
149

150 151 152 153 154 155 156 157
    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;
158 159 160 161 162
    c->avctx->extradata_size= 8;

    c->zstream.zalloc = Z_NULL;
    c->zstream.zfree = Z_NULL;
    c->zstream.opaque = Z_NULL;
163
    zret = deflateInit(&c->zstream, c->compression);
164 165 166 167 168 169 170 171 172 173 174 175 176
    if (zret != Z_OK) {
        av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
        return 1;
    }

    return 0;
}

/*
 *
 * Uninit lcl encoder
 *
 */
177
static av_cold int encode_end(AVCodecContext *avctx)
178 179 180 181
{
    LclEncContext *c = avctx->priv_data;

    av_freep(&avctx->extradata);
182
    deflateEnd(&c->zstream);
183 184 185 186

    return 0;
}

187
AVCodec ff_zlib_encoder = {
188 189
    .name           = "zlib",
    .type           = AVMEDIA_TYPE_VIDEO,
190
    .id             = AV_CODEC_ID_ZLIB,
191 192
    .priv_data_size = sizeof(LclEncContext),
    .init           = encode_init,
193
    .encode2        = encode_frame,
194
    .close          = encode_end,
195
    .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },
196
    .long_name      = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
197
};