libavcodec/lclenc.c

   1 /*
   2  * LCL (LossLess Codec Library) Codec
   3  * Copyright (c) 2002-2004 Roberto Togni
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file
  24  * LCL (LossLess Codec Library) Video Codec
  25  * Decoder for MSZH and ZLIB codecs
  26  * Experimental encoder for ZLIB RGB24
  27  *
  28  * Fourcc: MSZH, ZLIB
  29  *
  30  * Original Win32 dll:
  31  * Ver2.23 By Kenji Oshima 2000.09.20
  32  * avimszh.dll, avizlib.dll
  33  *
  34  * A description of the decoding algorithm can be found here:
  35  *   http://www.pcisys.net/~melanson/codecs
  36  *
  37  * Supports: BGR24 (RGB 24bpp)
  38  */
  39
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42
  43 #include "avcodec.h"
  44 #include "internal.h"
  45 #include "lcl.h"
  46 #include "libavutil/internal.h"
  47 #include "libavutil/mem.h"
  48
  49 #include <zlib.h>
  50
  51 typedef struct LclEncContext {
  52
  53     AVCodecContext *avctx;
  54
  55     // Image type
  56     int imgtype;
  57     // Compression type
  58     int compression;
  59     // Flags
  60     int flags;
  61     z_stream zstream;
  62 } LclEncContext;
  63
  64 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
  65                         const AVFrame *pict, int *got_packet)
  66 {
  67     LclEncContext *c = avctx->priv_data;
  68     const AVFrame * const p = pict;
  69     int i, ret;
  70     int zret; // Zlib return code
  71     int max_size = deflateBound(&c->zstream, avctx->width * avctx->height * 3);
  72
  73     if (!pkt->data &&
  74         (ret = av_new_packet(pkt, max_size)) < 0) {
  75             av_log(avctx, AV_LOG_ERROR, "Error allocating packet of size %d.\n", max_size);
  76             return ret;
  77     }
  78
  79     if(avctx->pix_fmt != AV_PIX_FMT_BGR24){
  80         av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
  81         return -1;
  82     }
  83
  84     zret = deflateReset(&c->zstream);
  85     if (zret != Z_OK) {
  86         av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
  87         return -1;
  88     }
  89     c->zstream.next_out  = pkt->data;
  90     c->zstream.avail_out = pkt->size;
  91
  92     for(i = avctx->height - 1; i >= 0; i--) {
  93         c->zstream.next_in = p->data[0]+p->linesize[0]*i;
  94         c->zstream.avail_in = avctx->width*3;
  95         zret = deflate(&c->zstream, Z_NO_FLUSH);
  96         if (zret != Z_OK) {
  97             av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
  98             return -1;
  99         }
 100     }
 101     zret = deflate(&c->zstream, Z_FINISH);
 102     if (zret != Z_STREAM_END) {
 103         av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
 104         return -1;
 105     }
 106
 107     pkt->size   = c->zstream.total_out;
 108     pkt->flags |= AV_PKT_FLAG_KEY;
 109     *got_packet = 1;
 110
 111     return 0;
 112 }
 113
 114 static av_cold int encode_init(AVCodecContext *avctx)
 115 {
 116     LclEncContext *c = avctx->priv_data;
 117     int zret; // Zlib return code
 118
 119     c->avctx= avctx;
 120
 121     assert(avctx->width && avctx->height);
 122
 123     avctx->extradata= av_mallocz(8);
 124     if (!avctx->extradata)
 125         return AVERROR(ENOMEM);
 126
 127 #if FF_API_CODED_FRAME
 128 FF_DISABLE_DEPRECATION_WARNINGS
 129     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
 130     avctx->coded_frame->key_frame = 1;
 131 FF_ENABLE_DEPRECATION_WARNINGS
 132 #endif
 133
 134     // Will be user settable someday
 135     c->compression = 6;
 136     c->flags = 0;
 137     c->imgtype = IMGTYPE_RGB24;
 138     avctx->bits_per_coded_sample= 24;
 139
 140     avctx->extradata[0]= 4;
 141     avctx->extradata[1]= 0;
 142     avctx->extradata[2]= 0;
 143     avctx->extradata[3]= 0;
 144     avctx->extradata[4]= c->imgtype;
 145     avctx->extradata[5]= c->compression;
 146     avctx->extradata[6]= c->flags;
 147     avctx->extradata[7]= CODEC_ZLIB;
 148     c->avctx->extradata_size= 8;
 149
 150     c->zstream.zalloc = Z_NULL;
 151     c->zstream.zfree = Z_NULL;
 152     c->zstream.opaque = Z_NULL;
 153     zret = deflateInit(&c->zstream, c->compression);
 154     if (zret != Z_OK) {
 155         av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
 156         return AVERROR_UNKNOWN;
 157     }
 158
 159     return 0;
 160 }
 161
 162 static av_cold int encode_end(AVCodecContext *avctx)
 163 {
 164     LclEncContext *c = avctx->priv_data;
 165
 166     av_freep(&avctx->extradata);
 167     deflateEnd(&c->zstream);
 168
 169     return 0;
 170 }
 171
 172 AVCodec ff_zlib_encoder = {
 173     .name           = "zlib",
 174     .long_name      = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
 175     .type           = AVMEDIA_TYPE_VIDEO,
 176     .id             = AV_CODEC_ID_ZLIB,
 177     .priv_data_size = sizeof(LclEncContext),
 178     .init           = encode_init,
 179     .encode2        = encode_frame,
 180     .close          = encode_end,
 181     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },
 182     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE |
 183                       FF_CODEC_CAP_INIT_CLEANUP,
 184 };