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