FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/bethsoftvideo.c
Date: 2026-04-30 02:42:23
Exec Total Coverage
Lines: 59 76 77.6%
Functions: 4 4 100.0%
Branches: 27 42 64.3%
Line Branch Exec Source
1 /*
2 * Bethesda VID video decoder
3 * Copyright (C) 2007 Nicholas Tung
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 * @brief Bethesda Softworks VID Video Decoder
25 * @author Nicholas Tung [ntung (at. ntung com] (2007-03)
26 * @see http://wiki.multimedia.cx/index.php?title=Bethsoft_VID
27 * @see http://www.svatopluk.com/andux/docs/dfvid.html
28 */
29
30 #include "libavutil/attributes.h"
31 #include "libavutil/common.h"
32 #include "avcodec.h"
33 #include "bethsoftvideo.h"
34 #include "bytestream.h"
35 #include "codec_internal.h"
36 #include "decode.h"
37
38 typedef struct BethsoftvidContext {
39 AVFrame *frame;
40 GetByteContext g;
41 } BethsoftvidContext;
42
43 2 static av_cold int bethsoftvid_decode_init(AVCodecContext *avctx)
44 {
45 2 BethsoftvidContext *vid = avctx->priv_data;
46 2 avctx->pix_fmt = AV_PIX_FMT_PAL8;
47
48 2 vid->frame = av_frame_alloc();
49
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 2 times.
 2 if (!vid->frame)
50 ✗ return AVERROR(ENOMEM);
51
52 2 return 0;
53 }
54
55 1 static int set_palette(BethsoftvidContext *ctx, GetByteContext *g)
56 {
57 1 uint32_t *palette = (uint32_t *)ctx->frame->data[1];
58 int a;
59
60
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 1 times.
 1 if (bytestream2_get_bytes_left(g) < 256*3)
61 ✗ return AVERROR_INVALIDDATA;
62
63
2/2
✓ Branch 0 taken 256 times.
✓ Branch 1 taken 1 times.
 257 for(a = 0; a < 256; a++){
64 256 palette[a] = 0xFFU << 24 | bytestream2_get_be24u(g) * 4;
65 256 palette[a] |= palette[a] >> 6 & 0x30303;
66 }
67 1 return 0;
68 }
69
70 74 static int bethsoftvid_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
71 int *got_frame, AVPacket *avpkt)
72 {
73 74 BethsoftvidContext * vid = avctx->priv_data;
74 char block_type;
75 uint8_t * dst;
76 uint8_t * frame_end;
77 74 int remaining = avctx->width; // number of bytes remaining on a line
78 int wrap_to_next_line;
79 int code, ret;
80 int yoffset;
81
82 74 bytestream2_init(&vid->g, avpkt->data, avpkt->size);
83 74 block_type = bytestream2_get_byte(&vid->g);
84
2/4
✓ Branch 0 taken 74 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 74 times.
 74 if (block_type < 1 || block_type > 4)
85 ✗ return AVERROR_INVALIDDATA;
86
87
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 74 times.
 74 if ((ret = ff_reget_buffer(avctx, vid->frame, 0)) < 0)
88 ✗ return ret;
89 74 wrap_to_next_line = vid->frame->linesize[0] - avctx->width;
90
91
2/2
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 73 times.
 74 if (avpkt->side_data_elems > 0 &&
92
1/2
✓ Branch 0 taken 1 times.
✗ Branch 1 not taken.
 1 avpkt->side_data[0].type == AV_PKT_DATA_PALETTE) {
93 GetByteContext g;
94 1 bytestream2_init(&g, avpkt->side_data[0].data,
95 1 avpkt->side_data[0].size);
96
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 1 times.
 1 if ((ret = set_palette(vid, &g)) < 0)
97 ✗ return ret;
98 }
99
100 74 dst = vid->frame->data[0];
101 74 frame_end = vid->frame->data[0] + vid->frame->linesize[0] * avctx->height;
102
103
2/4
✗ Branch 0 not taken.
✓ Branch 1 taken 73 times.
✓ Branch 2 taken 1 times.
✗ Branch 3 not taken.
 74 switch(block_type){
104 ✗ case PALETTE_BLOCK: {
105 ✗ *got_frame = 0;
106 ✗ if ((ret = set_palette(vid, &vid->g)) < 0) {
107 ✗ av_log(avctx, AV_LOG_ERROR, "error reading palette\n");
108 ✗ return ret;
109 }
110 ✗ return bytestream2_tell(&vid->g);
111 }
112 73 case VIDEO_YOFF_P_FRAME:
113 73 yoffset = bytestream2_get_le16(&vid->g);
114
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 73 times.
 73 if(yoffset >= avctx->height)
115 ✗ return AVERROR_INVALIDDATA;
116 73 dst += vid->frame->linesize[0] * yoffset;
117 av_fallthrough;
118 74 case VIDEO_P_FRAME:
119 case VIDEO_I_FRAME:
120 74 break;
121 ✗ default:
122 ✗ return AVERROR_INVALIDDATA;
123 }
124
125 // main code
126
2/2
✓ Branch 1 taken 224981 times.
✓ Branch 2 taken 74 times.
 225055 while((code = bytestream2_get_byte(&vid->g))){
127 224981 int length = code & 0x7f;
128
129 // copy any bytes starting at the current position, and ending at the frame width
130
2/2
✓ Branch 0 taken 12569 times.
✓ Branch 1 taken 224981 times.
 237550 while(length > remaining){
131
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 12569 times.
 12569 if(code < 0x80)
132 ✗ bytestream2_get_buffer(&vid->g, dst, remaining);
133
2/2
✓ Branch 0 taken 199 times.
✓ Branch 1 taken 12370 times.
 12569 else if(block_type == VIDEO_I_FRAME)
134 199 memset(dst, bytestream2_peek_byte(&vid->g), remaining);
135 12569 length -= remaining; // decrement the number of bytes to be copied
136 12569 dst += remaining + wrap_to_next_line; // skip over extra bytes at end of frame
137 12569 remaining = avctx->width;
138
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 12569 times.
 12569 if(dst == frame_end)
139 ✗ goto end;
140 }
141
142 // copy any remaining bytes after / if line overflows
143
2/2
✓ Branch 0 taken 109165 times.
✓ Branch 1 taken 115816 times.
 224981 if(code < 0x80)
144 109165 bytestream2_get_buffer(&vid->g, dst, length);
145
2/2
✓ Branch 0 taken 504 times.
✓ Branch 1 taken 115312 times.
 115816 else if(block_type == VIDEO_I_FRAME)
146 504 memset(dst, bytestream2_get_byte(&vid->g), length);
147 224981 remaining -= length;
148 224981 dst += length;
149 }
150 74 end:
151
152
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 74 times.
 74 if ((ret = av_frame_ref(rframe, vid->frame)) < 0)
153 ✗ return ret;
154
155 74 *got_frame = 1;
156
157 74 return avpkt->size;
158 }
159
160 2 static av_cold int bethsoftvid_decode_end(AVCodecContext *avctx)
161 {
162 2 BethsoftvidContext * vid = avctx->priv_data;
163 2 av_frame_free(&vid->frame);
164 2 return 0;
165 }
166
167 const FFCodec ff_bethsoftvid_decoder = {
168 .p.name = "bethsoftvid",
169 CODEC_LONG_NAME("Bethesda VID video"),
170 .p.type = AVMEDIA_TYPE_VIDEO,
171 .p.id = AV_CODEC_ID_BETHSOFTVID,
172 .priv_data_size = sizeof(BethsoftvidContext),
173 .init = bethsoftvid_decode_init,
174 .close = bethsoftvid_decode_end,
175 FF_CODEC_DECODE_CB(bethsoftvid_decode_frame),
176 .p.capabilities = AV_CODEC_CAP_DR1,
177 };
178