FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/bethsoftvideo.c
Date: 2025-04-25 22:50:00
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/common.h"
31 #include "avcodec.h"
32 #include "bethsoftvideo.h"
33 #include "bytestream.h"
34 #include "codec_internal.h"
35 #include "decode.h"
36
37 typedef struct BethsoftvidContext {
38 AVFrame *frame;
39 GetByteContext g;
40 } BethsoftvidContext;
41
42 2 static av_cold int bethsoftvid_decode_init(AVCodecContext *avctx)
43 {
44 2 BethsoftvidContext *vid = avctx->priv_data;
45 2 avctx->pix_fmt = AV_PIX_FMT_PAL8;
46
47 2 vid->frame = av_frame_alloc();
48
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 2 if (!vid->frame)
49 ✗ return AVERROR(ENOMEM);
50
51 2 return 0;
52 }
53
54 1 static int set_palette(BethsoftvidContext *ctx, GetByteContext *g)
55 {
56 1 uint32_t *palette = (uint32_t *)ctx->frame->data[1];
57 int a;
58
59
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 1 if (bytestream2_get_bytes_left(g) < 256*3)
60 ✗ return AVERROR_INVALIDDATA;
61
62
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 257 for(a = 0; a < 256; a++){
63 256 palette[a] = 0xFFU << 24 | bytestream2_get_be24u(g) * 4;
64 256 palette[a] |= palette[a] >> 6 & 0x30303;
65 }
66 1 return 0;
67 }
68
69 80 static int bethsoftvid_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
70 int *got_frame, AVPacket *avpkt)
71 {
72 80 BethsoftvidContext * vid = avctx->priv_data;
73 char block_type;
74 uint8_t * dst;
75 uint8_t * frame_end;
76 80 int remaining = avctx->width; // number of bytes remaining on a line
77 int wrap_to_next_line;
78 int code, ret;
79 int yoffset;
80
81 80 bytestream2_init(&vid->g, avpkt->data, avpkt->size);
82 80 block_type = bytestream2_get_byte(&vid->g);
83
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 80 if (block_type < 1 || block_type > 4)
84 ✗ return AVERROR_INVALIDDATA;
85
86
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 80 if ((ret = ff_reget_buffer(avctx, vid->frame, 0)) < 0)
87 ✗ return ret;
88 80 wrap_to_next_line = vid->frame->linesize[0] - avctx->width;
89
90
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 80 if (avpkt->side_data_elems > 0 &&
91
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 1 avpkt->side_data[0].type == AV_PKT_DATA_PALETTE) {
92 GetByteContext g;
93 1 bytestream2_init(&g, avpkt->side_data[0].data,
94 1 avpkt->side_data[0].size);
95
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 1 if ((ret = set_palette(vid, &g)) < 0)
96 ✗ return ret;
97 }
98
99 80 dst = vid->frame->data[0];
100 80 frame_end = vid->frame->data[0] + vid->frame->linesize[0] * avctx->height;
101
102
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 80 switch(block_type){
103 ✗ case PALETTE_BLOCK: {
104 ✗ *got_frame = 0;
105 ✗ if ((ret = set_palette(vid, &vid->g)) < 0) {
106 ✗ av_log(avctx, AV_LOG_ERROR, "error reading palette\n");
107 ✗ return ret;
108 }
109 ✗ return bytestream2_tell(&vid->g);
110 }
111 79 case VIDEO_YOFF_P_FRAME:
112 79 yoffset = bytestream2_get_le16(&vid->g);
113
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 79 if(yoffset >= avctx->height)
114 ✗ return AVERROR_INVALIDDATA;
115 79 dst += vid->frame->linesize[0] * yoffset;
116 80 case VIDEO_P_FRAME:
117 case VIDEO_I_FRAME:
118 80 break;
119 ✗ default:
120 ✗ return AVERROR_INVALIDDATA;
121 }
122
123 // main code
124
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 243842 while((code = bytestream2_get_byte(&vid->g))){
125 243762 int length = code & 0x7f;
126
127 // copy any bytes starting at the current position, and ending at the frame width
128
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 257352 while(length > remaining){
129
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 13590 if(code < 0x80)
130 ✗ bytestream2_get_buffer(&vid->g, dst, remaining);
131
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 13590 else if(block_type == VIDEO_I_FRAME)
132 199 memset(dst, bytestream2_peek_byte(&vid->g), remaining);
133 13590 length -= remaining; // decrement the number of bytes to be copied
134 13590 dst += remaining + wrap_to_next_line; // skip over extra bytes at end of frame
135 13590 remaining = avctx->width;
136
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 13590 if(dst == frame_end)
137 ✗ goto end;
138 }
139
140 // copy any remaining bytes after / if line overflows
141
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 243762 if(code < 0x80)
142 118307 bytestream2_get_buffer(&vid->g, dst, length);
143
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 125455 else if(block_type == VIDEO_I_FRAME)
144 504 memset(dst, bytestream2_get_byte(&vid->g), length);
145 243762 remaining -= length;
146 243762 dst += length;
147 }
148 80 end:
149
150
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 80 if ((ret = av_frame_ref(rframe, vid->frame)) < 0)
151 ✗ return ret;
152
153 80 *got_frame = 1;
154
155 80 return avpkt->size;
156 }
157
158 2 static av_cold int bethsoftvid_decode_end(AVCodecContext *avctx)
159 {
160 2 BethsoftvidContext * vid = avctx->priv_data;
161 2 av_frame_free(&vid->frame);
162 2 return 0;
163 }
164
165 const FFCodec ff_bethsoftvid_decoder = {
166 .p.name = "bethsoftvid",
167 CODEC_LONG_NAME("Bethesda VID video"),
168 .p.type = AVMEDIA_TYPE_VIDEO,
169 .p.id = AV_CODEC_ID_BETHSOFTVID,
170 .priv_data_size = sizeof(BethsoftvidContext),
171 .init = bethsoftvid_decode_init,
172 .close = bethsoftvid_decode_end,
173 FF_CODEC_DECODE_CB(bethsoftvid_decode_frame),
174 .p.capabilities = AV_CODEC_CAP_DR1,
175 };
176