| 1 | /* |
| 2 | * LCL (LossLess Codec Library) Codec |
| 3 | * Copyright (c) 2002-2004 Roberto Togni |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg 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 | * FFmpeg 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 FFmpeg; 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 | |
| 41 | #include <stdio.h> |
| 42 | #include <stdlib.h> |
| 43 | |
| 44 | #include "libavutil/avassert.h" |
| 45 | #include "avcodec.h" |
| 46 | #include "internal.h" |
| 47 | #include "lcl.h" |
| 48 | #include "libavutil/internal.h" |
| 49 | #include "libavutil/mem.h" |
| 50 | |
| 51 | #include <zlib.h> |
| 52 | |
| 53 | /* |
| 54 | * Decoder context |
| 55 | */ |
| 56 | typedef struct LclEncContext { |
| 57 | |
| 58 | AVCodecContext *avctx; |
| 59 | |
| 60 | // Image type |
| 61 | int imgtype; |
| 62 | // Compression type |
| 63 | int compression; |
| 64 | // Flags |
| 65 | int flags; |
| 66 | z_stream zstream; |
| 67 | } LclEncContext; |
| 68 | |
| 69 | /* |
| 70 | * |
| 71 | * Encode a frame |
| 72 | * |
| 73 | */ |
| 74 | static int encode_frame(AVCodecContext *avctx, AVPacket *pkt, |
| 75 | const AVFrame *p, int *got_packet) |
| 76 | { |
| 77 | LclEncContext *c = avctx->priv_data; |
| 78 | int i, ret; |
| 79 | int zret; // Zlib return code |
| 80 | int max_size = deflateBound(&c->zstream, avctx->width * avctx->height * 3); |
| 81 | |
| 82 | if ((ret = ff_alloc_packet2(avctx, pkt, max_size)) < 0) |
| 83 | return ret; |
| 84 | |
| 85 | if(avctx->pix_fmt != AV_PIX_FMT_BGR24){ |
| 86 | av_log(avctx, AV_LOG_ERROR, "Format not supported!\n"); |
| 87 | return -1; |
| 88 | } |
| 89 | |
| 90 | zret = deflateReset(&c->zstream); |
| 91 | if (zret != Z_OK) { |
| 92 | av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret); |
| 93 | return -1; |
| 94 | } |
| 95 | c->zstream.next_out = pkt->data; |
| 96 | c->zstream.avail_out = pkt->size; |
| 97 | |
| 98 | for(i = avctx->height - 1; i >= 0; i--) { |
| 99 | c->zstream.next_in = p->data[0]+p->linesize[0]*i; |
| 100 | c->zstream.avail_in = avctx->width*3; |
| 101 | zret = deflate(&c->zstream, Z_NO_FLUSH); |
| 102 | if (zret != Z_OK) { |
| 103 | av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret); |
| 104 | return -1; |
| 105 | } |
| 106 | } |
| 107 | zret = deflate(&c->zstream, Z_FINISH); |
| 108 | if (zret != Z_STREAM_END) { |
| 109 | av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret); |
| 110 | return -1; |
| 111 | } |
| 112 | |
| 113 | pkt->size = c->zstream.total_out; |
| 114 | pkt->flags |= AV_PKT_FLAG_KEY; |
| 115 | *got_packet = 1; |
| 116 | |
| 117 | return 0; |
| 118 | } |
| 119 | |
| 120 | /* |
| 121 | * |
| 122 | * Init lcl encoder |
| 123 | * |
| 124 | */ |
| 125 | static av_cold int encode_init(AVCodecContext *avctx) |
| 126 | { |
| 127 | LclEncContext *c = avctx->priv_data; |
| 128 | int zret; // Zlib return code |
| 129 | |
| 130 | c->avctx= avctx; |
| 131 | |
| 132 | av_assert0(avctx->width && avctx->height); |
| 133 | |
| 134 | avctx->extradata = av_mallocz(8 + FF_INPUT_BUFFER_PADDING_SIZE); |
| 135 | if (!avctx->extradata) |
| 136 | return AVERROR(ENOMEM); |
| 137 | |
| 138 | avctx->coded_frame = av_frame_alloc(); |
| 139 | if (!avctx->coded_frame) |
| 140 | return AVERROR(ENOMEM); |
| 141 | |
| 142 | avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I; |
| 143 | avctx->coded_frame->key_frame = 1; |
| 144 | |
| 145 | c->compression = avctx->compression_level == FF_COMPRESSION_DEFAULT ? |
| 146 | COMP_ZLIB_NORMAL : |
| 147 | av_clip(avctx->compression_level, 0, 9); |
| 148 | c->flags = 0; |
| 149 | c->imgtype = IMGTYPE_RGB24; |
| 150 | avctx->bits_per_coded_sample= 24; |
| 151 | |
| 152 | avctx->extradata[0]= 4; |
| 153 | avctx->extradata[1]= 0; |
| 154 | avctx->extradata[2]= 0; |
| 155 | avctx->extradata[3]= 0; |
| 156 | avctx->extradata[4]= c->imgtype; |
| 157 | avctx->extradata[5]= c->compression; |
| 158 | avctx->extradata[6]= c->flags; |
| 159 | avctx->extradata[7]= CODEC_ZLIB; |
| 160 | c->avctx->extradata_size= 8; |
| 161 | |
| 162 | c->zstream.zalloc = Z_NULL; |
| 163 | c->zstream.zfree = Z_NULL; |
| 164 | c->zstream.opaque = Z_NULL; |
| 165 | zret = deflateInit(&c->zstream, c->compression); |
| 166 | if (zret != Z_OK) { |
| 167 | av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret); |
| 168 | return 1; |
| 169 | } |
| 170 | |
| 171 | return 0; |
| 172 | } |
| 173 | |
| 174 | /* |
| 175 | * |
| 176 | * Uninit lcl encoder |
| 177 | * |
| 178 | */ |
| 179 | static av_cold int encode_end(AVCodecContext *avctx) |
| 180 | { |
| 181 | LclEncContext *c = avctx->priv_data; |
| 182 | |
| 183 | av_freep(&avctx->extradata); |
| 184 | deflateEnd(&c->zstream); |
| 185 | |
| 186 | av_frame_free(&avctx->coded_frame); |
| 187 | |
| 188 | return 0; |
| 189 | } |
| 190 | |
| 191 | AVCodec ff_zlib_encoder = { |
| 192 | .name = "zlib", |
| 193 | .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"), |
| 194 | .type = AVMEDIA_TYPE_VIDEO, |
| 195 | .id = AV_CODEC_ID_ZLIB, |
| 196 | .priv_data_size = sizeof(LclEncContext), |
| 197 | .init = encode_init, |
| 198 | .encode2 = encode_frame, |
| 199 | .close = encode_end, |
| 200 | .capabilities = CODEC_CAP_FRAME_THREADS | CODEC_CAP_INTRA_ONLY, |
| 201 | .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE }, |
| 202 | }; |