FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/lclenc.c
Date: 2026-01-23 14:02:51
Exec Total Coverage
Lines: 45 56 80.4%
Functions: 3 3 100.0%
Branches: 11 20 55.0%
Line Branch Exec Source
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
67 200 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
68 const AVFrame *p, int *got_packet)
69 {
70 200 LclEncContext *c = avctx->priv_data;
71 200 z_stream *const zstream = &c->zstream.zstream;
72 int i, ret;
73 int zret; // Zlib return code
74 200 int max_size = deflateBound(zstream, avctx->width * avctx->height * 3);
75
76
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 200 if ((ret = ff_alloc_packet(avctx, pkt, max_size)) < 0)
77 ✗ return ret;
78
79
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 200 if(avctx->pix_fmt != AV_PIX_FMT_BGR24){
80 ✗ av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
81 ✗ return -1;
82 }
83
84 200 zret = deflateReset(zstream);
85
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 200 if (zret != Z_OK) {
86 ✗ av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
87 ✗ return -1;
88 }
89 200 zstream->next_out = pkt->data;
90 200 zstream->avail_out = pkt->size;
91
92
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 45100 for(i = avctx->height - 1; i >= 0; i--) {
93 44900 zstream->next_in = p->data[0] + p->linesize[0] * i;
94 44900 zstream->avail_in = avctx->width * 3;
95 44900 zret = deflate(zstream, Z_NO_FLUSH);
96
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 44900 if (zret != Z_OK) {
97 ✗ av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
98 ✗ return -1;
99 }
100 }
101 200 zret = deflate(zstream, Z_FINISH);
102
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 200 if (zret != Z_STREAM_END) {
103 ✗ av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
104 ✗ return -1;
105 }
106
107 200 pkt->size = zstream->total_out;
108 200 *got_packet = 1;
109
110 200 return 0;
111 }
112
113 4 static av_cold int encode_init(AVCodecContext *avctx)
114 {
115 4 LclEncContext *c = avctx->priv_data;
116
117 4 c->avctx= avctx;
118
119
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 4 av_assert0(avctx->width && avctx->height);
120
121 4 avctx->extradata = av_mallocz(8 + AV_INPUT_BUFFER_PADDING_SIZE);
122
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 4 if (!avctx->extradata)
123 ✗ return AVERROR(ENOMEM);
124
125 8 c->compression = avctx->compression_level == FF_COMPRESSION_DEFAULT ?
126
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 4 COMP_ZLIB_NORMAL :
127 ✗ av_clip(avctx->compression_level, 0, 9);
128 4 c->flags = 0;
129 4 c->imgtype = IMGTYPE_RGB24;
130 4 avctx->bits_per_coded_sample= 24;
131
132 4 avctx->extradata[0]= 4;
133 4 avctx->extradata[1]= 0;
134 4 avctx->extradata[2]= 0;
135 4 avctx->extradata[3]= 0;
136 4 avctx->extradata[4]= c->imgtype;
137 4 avctx->extradata[5]= c->compression;
138 4 avctx->extradata[6]= c->flags;
139 4 avctx->extradata[7]= CODEC_ZLIB;
140 4 c->avctx->extradata_size= 8;
141
142 4 return ff_deflate_init(&c->zstream, c->compression, avctx);
143 }
144
145 4 static av_cold int encode_end(AVCodecContext *avctx)
146 {
147 4 LclEncContext *c = avctx->priv_data;
148
149 4 ff_deflate_end(&c->zstream);
150
151 4 return 0;
152 }
153
154 const FFCodec ff_zlib_encoder = {
155 .p.name = "zlib",
156 CODEC_LONG_NAME("LCL (LossLess Codec Library) ZLIB"),
157 .p.type = AVMEDIA_TYPE_VIDEO,
158 .p.id = AV_CODEC_ID_ZLIB,
159 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS |
160 AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
161 .priv_data_size = sizeof(LclEncContext),
162 .init = encode_init,
163 FF_CODEC_ENCODE_CB(encode_frame),
164 .close = encode_end,
165 CODEC_PIXFMTS(AV_PIX_FMT_BGR24),
166 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
167 };
168