FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/cscd.c
Date: 2025-10-24 21:16:34
Exec Total Coverage
Lines: 62 85 72.9%
Functions: 5 5 100.0%
Branches: 17 37 45.9%
Line Branch Exec Source
1 /*
2 * CamStudio decoder
3 * Copyright (c) 2006 Reimar Doeffinger
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 #include "avcodec.h"
23 #include "codec_internal.h"
24 #include "decode.h"
25 #include "libavutil/mem.h"
26
27 #if CONFIG_ZLIB
28 #include <zlib.h>
29 #endif
30 #include "libavutil/lzo.h"
31
32 typedef struct CamStudioContext {
33 AVFrame *pic;
34 int linelen, height, bpp;
35 unsigned int decomp_size;
36 unsigned char* decomp_buf;
37 } CamStudioContext;
38
39 8 static void copy_frame_default(AVFrame *f, const uint8_t *src,
40 int linelen, int height)
41 {
42 8 int i, src_stride = FFALIGN(linelen, 4);
43 8 uint8_t *dst = f->data[0];
44 8 dst += (height - 1) * f->linesize[0];
45
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 2408 for (i = height; i; i--) {
46 2400 memcpy(dst, src, linelen);
47 2400 src += src_stride;
48 2400 dst -= f->linesize[0];
49 }
50 8 }
51
52 200 static void add_frame_default(AVFrame *f, const uint8_t *src,
53 int linelen, int height)
54 {
55 200 int i, j, src_stride = FFALIGN(linelen, 4);
56 200 uint8_t *dst = f->data[0];
57 200 dst += (height - 1) * f->linesize[0];
58
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 60200 for (i = height; i; i--) {
59
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 72060000 for (j = linelen; j; j--)
60 72000000 *dst++ += *src++;
61 60000 src += src_stride - linelen;
62 60000 dst -= f->linesize[0] + linelen;
63 }
64 200 }
65
66 208 static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
67 int *got_frame, AVPacket *avpkt)
68 {
69 208 const uint8_t *buf = avpkt->data;
70 208 int buf_size = avpkt->size;
71 208 CamStudioContext *c = avctx->priv_data;
72 int ret;
73 208 int bpp = avctx->bits_per_coded_sample / 8;
74 208 int bugdelta = FFALIGN(avctx->width * bpp, 4) * avctx->height
75 208 - (avctx->width & ~3) * bpp * avctx->height;
76
77
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 208 if (buf_size < 2) {
78 ✗ av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
79 ✗ return AVERROR_INVALIDDATA;
80 }
81
82
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 208 if ((ret = ff_reget_buffer(avctx, c->pic, 0)) < 0)
83 ✗ return ret;
84
85 // decompress data
86
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 208 switch ((buf[0] >> 1) & 7) {
87 208 case 0: { // lzo compression
88 208 int outlen = c->decomp_size, inlen = buf_size - 2;
89
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 208 if (av_lzo1x_decode(c->decomp_buf, &outlen, &buf[2], &inlen) || (outlen && outlen != bugdelta)) {
90 ✗ av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
91 ✗ return AVERROR_INVALIDDATA;
92 }
93 208 break;
94 }
95 ✗ case 1: { // zlib compression
96 #if CONFIG_ZLIB
97 ✗ unsigned long dlen = c->decomp_size;
98 ✗ if (uncompress(c->decomp_buf, &dlen, &buf[2], buf_size - 2) != Z_OK || (dlen != c->decomp_size && dlen != c->decomp_size - bugdelta)) {
99 ✗ av_log(avctx, AV_LOG_ERROR, "error during zlib decompression\n");
100 ✗ return AVERROR_INVALIDDATA;
101 }
102 ✗ break;
103 #else
104 av_log(avctx, AV_LOG_ERROR, "compiled without zlib support\n");
105 return AVERROR(ENOSYS);
106 #endif
107 }
108 ✗ default:
109 ✗ av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
110 ✗ return AVERROR_INVALIDDATA;
111 }
112
113 // flip upside down, add difference frame
114
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 208 if (buf[0] & 1) { // keyframe
115 8 c->pic->pict_type = AV_PICTURE_TYPE_I;
116 8 c->pic->flags |= AV_FRAME_FLAG_KEY;
117 8 copy_frame_default(c->pic, c->decomp_buf,
118 c->linelen, c->height);
119 } else {
120 200 c->pic->pict_type = AV_PICTURE_TYPE_P;
121 200 c->pic->flags &= ~AV_FRAME_FLAG_KEY;
122 200 add_frame_default(c->pic, c->decomp_buf,
123 c->linelen, c->height);
124 }
125
126 208 *got_frame = 1;
127
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 208 if ((ret = av_frame_ref(rframe, c->pic)) < 0)
128 ✗ return ret;
129
130 208 return buf_size;
131 }
132
133 2 static av_cold int decode_init(AVCodecContext *avctx)
134 {
135 2 CamStudioContext *c = avctx->priv_data;
136 int stride;
137
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 2 switch (avctx->bits_per_coded_sample) {
138 ✗ case 16: avctx->pix_fmt = AV_PIX_FMT_RGB555LE; break;
139 ✗ case 24: avctx->pix_fmt = AV_PIX_FMT_BGR24; break;
140 2 case 32: avctx->pix_fmt = AV_PIX_FMT_BGR0; break;
141 ✗ default:
142 ✗ av_log(avctx, AV_LOG_ERROR,
143 "CamStudio codec error: invalid depth %i bpp\n",
144 avctx->bits_per_coded_sample);
145 ✗ return AVERROR_INVALIDDATA;
146 }
147 2 c->bpp = avctx->bits_per_coded_sample;
148 2 c->linelen = avctx->width * avctx->bits_per_coded_sample / 8;
149 2 c->height = avctx->height;
150 2 stride = FFALIGN(c->linelen, 4);
151 2 c->decomp_size = c->height * stride;
152 2 c->decomp_buf = av_malloc(c->decomp_size + AV_LZO_OUTPUT_PADDING);
153
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 2 if (!c->decomp_buf) {
154 ✗ av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
155 ✗ return AVERROR(ENOMEM);
156 }
157 2 c->pic = av_frame_alloc();
158
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 2 if (!c->pic)
159 ✗ return AVERROR(ENOMEM);
160 2 return 0;
161 }
162
163 2 static av_cold int decode_end(AVCodecContext *avctx)
164 {
165 2 CamStudioContext *c = avctx->priv_data;
166 2 av_freep(&c->decomp_buf);
167 2 av_frame_free(&c->pic);
168 2 return 0;
169 }
170
171 const FFCodec ff_cscd_decoder = {
172 .p.name = "camstudio",
173 CODEC_LONG_NAME("CamStudio"),
174 .p.type = AVMEDIA_TYPE_VIDEO,
175 .p.id = AV_CODEC_ID_CSCD,
176 .priv_data_size = sizeof(CamStudioContext),
177 .init = decode_init,
178 .close = decode_end,
179 FF_CODEC_DECODE_CB(decode_frame),
180 .p.capabilities = AV_CODEC_CAP_DR1,
181 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
182 };
183