FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/lclenc.c
Date: 2021-09-16 08:47:15
Exec Total Coverage
Lines: 50 63 79.4%
Branches: 12 22 54.5%

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 "encode.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 typedef struct LclEncContext {
54
55 AVCodecContext *avctx;
56
57 // Image type
58 int imgtype;
59 // Compression type
60 int compression;
61 // Flags
62 int flags;
63 z_stream zstream;
64 } LclEncContext;
65
66 200 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
67 const AVFrame *p, int *got_packet)
68 {
69 200 LclEncContext *c = avctx->priv_data;
70 int i, ret;
71 int zret; // Zlib return code
72 200 int max_size = deflateBound(&c->zstream, avctx->width * avctx->height * 3);
73
74
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200 if ((ret = ff_alloc_packet(avctx, pkt, max_size)) < 0)
75 return ret;
76
77
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200 if(avctx->pix_fmt != AV_PIX_FMT_BGR24){
78 av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
79 return -1;
80 }
81
82 200 zret = deflateReset(&c->zstream);
83
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200 if (zret != Z_OK) {
84 av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
85 return -1;
86 }
87 200 c->zstream.next_out = pkt->data;
88 200 c->zstream.avail_out = pkt->size;
89
90
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45100 for(i = avctx->height - 1; i >= 0; i--) {
91 44900 c->zstream.next_in = p->data[0]+p->linesize[0]*i;
92 44900 c->zstream.avail_in = avctx->width*3;
93 44900 zret = deflate(&c->zstream, Z_NO_FLUSH);
94
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44900 if (zret != Z_OK) {
95 av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
96 return -1;
97 }
98 }
99 200 zret = deflate(&c->zstream, Z_FINISH);
100
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200 if (zret != Z_STREAM_END) {
101 av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
102 return -1;
103 }
104
105 200 pkt->size = c->zstream.total_out;
106 200 pkt->flags |= AV_PKT_FLAG_KEY;
107 200 *got_packet = 1;
108
109 200 return 0;
110 }
111
112 4 static av_cold int encode_init(AVCodecContext *avctx)
113 {
114 4 LclEncContext *c = avctx->priv_data;
115 int zret; // Zlib return code
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 c->zstream.zalloc = Z_NULL;
143 4 c->zstream.zfree = Z_NULL;
144 4 c->zstream.opaque = Z_NULL;
145 4 zret = deflateInit(&c->zstream, c->compression);
146
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4 if (zret != Z_OK) {
147 av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
148 return AVERROR_UNKNOWN;
149 }
150
151 4 return 0;
152 }
153
154 4 static av_cold int encode_end(AVCodecContext *avctx)
155 {
156 4 LclEncContext *c = avctx->priv_data;
157
158 4 deflateEnd(&c->zstream);
159
160 4 return 0;
161 }
162
163 const AVCodec ff_zlib_encoder = {
164 .name = "zlib",
165 .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
166 .type = AVMEDIA_TYPE_VIDEO,
167 .id = AV_CODEC_ID_ZLIB,
168 .priv_data_size = sizeof(LclEncContext),
169 .init = encode_init,
170 .encode2 = encode_frame,
171 .close = encode_end,
172 .capabilities = AV_CODEC_CAP_FRAME_THREADS,
173 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },
174 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
175 FF_CODEC_CAP_INIT_CLEANUP,
176 };
177