1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
/*
* LCL (LossLess Codec Library) Codec
* Copyright (c) 2002-2004 Roberto Togni
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* 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>
#include "avcodec.h"
#include "lcl.h"
#include "libavutil/internal.h"
#include "libavutil/mem.h"
#include <zlib.h>
/*
* Decoder context
*/
typedef struct LclEncContext {
AVCodecContext *avctx;
AVFrame pic;
// Image type
int imgtype;
// Compression type
int compression;
// Flags
int flags;
z_stream zstream;
} LclEncContext;
/*
*
* Encode a frame
*
*/
static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *pict, int *got_packet)
{
LclEncContext *c = avctx->priv_data;
AVFrame * const p = &c->pic;
int i, ret;
int zret; // Zlib return code
int max_size = deflateBound(&c->zstream, avctx->width * avctx->height * 3);
if (!pkt->data &&
(ret = av_new_packet(pkt, max_size)) < 0) {
av_log(avctx, AV_LOG_ERROR, "Error allocating packet of size %d.\n", max_size);
return ret;
}
*p = *pict;
p->pict_type= AV_PICTURE_TYPE_I;
p->key_frame= 1;
if(avctx->pix_fmt != PIX_FMT_BGR24){
av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
return -1;
}
zret = deflateReset(&c->zstream);
if (zret != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
return -1;
}
c->zstream.next_out = pkt->data;
c->zstream.avail_out = pkt->size;
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;
zret = deflate(&c->zstream, Z_NO_FLUSH);
if (zret != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
return -1;
}
}
zret = deflate(&c->zstream, Z_FINISH);
if (zret != Z_STREAM_END) {
av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
return -1;
}
pkt->size = c->zstream.total_out;
pkt->flags |= AV_PKT_FLAG_KEY;
*got_packet = 1;
return 0;
}
/*
*
* Init lcl encoder
*
*/
static av_cold int encode_init(AVCodecContext *avctx)
{
LclEncContext *c = avctx->priv_data;
int zret; // Zlib return code
c->avctx= avctx;
assert(avctx->width && avctx->height);
avctx->extradata= av_mallocz(8);
avctx->coded_frame= &c->pic;
// Will be user settable someday
c->compression = 6;
c->flags = 0;
c->imgtype = IMGTYPE_RGB24;
avctx->bits_per_coded_sample= 24;
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;
c->avctx->extradata_size= 8;
c->zstream.zalloc = Z_NULL;
c->zstream.zfree = Z_NULL;
c->zstream.opaque = Z_NULL;
zret = deflateInit(&c->zstream, c->compression);
if (zret != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
return 1;
}
return 0;
}
/*
*
* Uninit lcl encoder
*
*/
static av_cold int encode_end(AVCodecContext *avctx)
{
LclEncContext *c = avctx->priv_data;
av_freep(&avctx->extradata);
deflateEnd(&c->zstream);
return 0;
}
AVCodec ff_zlib_encoder = {
.name = "zlib",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_ZLIB,
.priv_data_size = sizeof(LclEncContext),
.init = encode_init,
.encode2 = encode_frame,
.close = encode_end,
.pix_fmts = (const enum PixelFormat[]) { PIX_FMT_BGR24, PIX_FMT_NONE },
.long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
};
|
