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 "codec_internal.h"
46 #include "encode.h"
47 #include "lcl.h"
48 #include "zlib_wrapper.h"
49 #include "libavutil/internal.h"
50 #include "libavutil/mem.h"
51
52 #include <zlib.h>
53
54 typedef struct LclEncContext {
55
56 AVCodecContext *avctx;
57
58 // Image type
59 int imgtype;
60 // Compression type
61 int compression;
62 // Flags
63 int flags;
64 FFZStream zstream;
65 } LclEncContext;
66
encode_frame(AVCodecContext * avctx,AVPacket * pkt,const AVFrame * p,int * got_packet)67 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
68 const AVFrame *p, int *got_packet)
69 {
70 LclEncContext *c = avctx->priv_data;
71 z_stream *const zstream = &c->zstream.zstream;
72 int i, ret;
73 int zret; // Zlib return code
74 int max_size = deflateBound(zstream, avctx->width * avctx->height * 3);
75
76 if ((ret = ff_alloc_packet(avctx, pkt, max_size)) < 0)
77 return ret;
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(zstream);
85 if (zret != Z_OK) {
86 av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
87 return -1;
88 }
89 zstream->next_out = pkt->data;
90 zstream->avail_out = pkt->size;
91
92 for(i = avctx->height - 1; i >= 0; i--) {
93 zstream->next_in = p->data[0] + p->linesize[0] * i;
94 zstream->avail_in = avctx->width * 3;
95 zret = deflate(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(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 = zstream->total_out;
108 *got_packet = 1;
109
110 return 0;
111 }
112
encode_init(AVCodecContext * avctx)113 static av_cold int encode_init(AVCodecContext *avctx)
114 {
115 LclEncContext *c = avctx->priv_data;
116
117 c->avctx= avctx;
118
119 av_assert0(avctx->width && avctx->height);
120
121 avctx->extradata = av_mallocz(8 + AV_INPUT_BUFFER_PADDING_SIZE);
122 if (!avctx->extradata)
123 return AVERROR(ENOMEM);
124
125 c->compression = avctx->compression_level == FF_COMPRESSION_DEFAULT ?
126 COMP_ZLIB_NORMAL :
127 av_clip(avctx->compression_level, 0, 9);
128 c->flags = 0;
129 c->imgtype = IMGTYPE_RGB24;
130 avctx->bits_per_coded_sample= 24;
131
132 avctx->extradata[0]= 4;
133 avctx->extradata[1]= 0;
134 avctx->extradata[2]= 0;
135 avctx->extradata[3]= 0;
136 avctx->extradata[4]= c->imgtype;
137 avctx->extradata[5]= c->compression;
138 avctx->extradata[6]= c->flags;
139 avctx->extradata[7]= CODEC_ZLIB;
140 c->avctx->extradata_size= 8;
141
142 return ff_deflate_init(&c->zstream, c->compression, avctx);
143 }
144
encode_end(AVCodecContext * avctx)145 static av_cold int encode_end(AVCodecContext *avctx)
146 {
147 LclEncContext *c = avctx->priv_data;
148
149 ff_deflate_end(&c->zstream);
150
151 return 0;
152 }
153
154 const FFCodec ff_zlib_encoder = {
155 .p.name = "zlib",
156 .p.long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
157 .p.type = AVMEDIA_TYPE_VIDEO,
158 .p.id = AV_CODEC_ID_ZLIB,
159 .priv_data_size = sizeof(LclEncContext),
160 .init = encode_init,
161 FF_CODEC_ENCODE_CB(encode_frame),
162 .close = encode_end,
163 .p.capabilities = AV_CODEC_CAP_FRAME_THREADS,
164 .p.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },
165 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
166 FF_CODEC_CAP_INIT_CLEANUP,
167 };
168