FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/tmv.c
Date: 2025-07-28 20:30:09
Exec Total Coverage
Lines: 25 26 96.2%
Functions: 2 2 100.0%
Branches: 7 8 87.5%

Line Branch Exec Source
1 /*
2 * 8088flex TMV video decoder
3 * Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu>
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 * 8088flex TMV video decoder
25 * @author Daniel Verkamp
26 * @see http://www.oldskool.org/pc/8088_Corruption
27 */
28
29 #include <string.h>
30
31 #include "avcodec.h"
32 #include "codec_internal.h"
33 #include "decode.h"
34 #include "libavutil/internal.h"
35 #include "libavutil/xga_font_data.h"
36
37 #include "cga_data.h"
38
39 111 static int tmv_decode_frame(AVCodecContext *avctx, AVFrame *frame,
40 int *got_frame, AVPacket *avpkt)
41 {
42 111 const uint8_t *src = avpkt->data;
43 111 const uint8_t *cga_font = avpriv_cga_font_get();
44 uint8_t *dst;
45 111 unsigned char_cols = avctx->width >> 3;
46 111 unsigned char_rows = avctx->height >> 3;
47 unsigned x, y, fg, bg, c;
48 int ret;
49
50
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111 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
51 return ret;
52
53
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111 if (avpkt->size < 2*char_rows*char_cols) {
54 1 av_log(avctx, AV_LOG_ERROR,
55 "Input buffer too small, truncated sample?\n");
56 1 *got_frame = 0;
57 1 return AVERROR_INVALIDDATA;
58 }
59
60 110 dst = frame->data[0];
61
62 110 memcpy(frame->data[1], ff_cga_palette, 16 * 4);
63 110 memset(frame->data[1] + 16 * 4, 0, AVPALETTE_SIZE - 16 * 4);
64
65
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2860 for (y = 0; y < char_rows; y++) {
66
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112750 for (x = 0; x < char_cols; x++) {
67 110000 c = *src++;
68 110000 bg = *src >> 4;
69 110000 fg = *src++ & 0xF;
70 110000 ff_draw_pc_font(dst + x * 8, frame->linesize[0],
71 cga_font, 8, c, fg, bg);
72 }
73 2750 dst += frame->linesize[0] * 8;
74 }
75
76 110 *got_frame = 1;
77
78 110 return avpkt->size;
79 }
80
81 2 static av_cold int tmv_decode_init(AVCodecContext *avctx)
82 {
83 2 avctx->pix_fmt = AV_PIX_FMT_PAL8;
84 2 return 0;
85 }
86
87 const FFCodec ff_tmv_decoder = {
88 .p.name = "tmv",
89 CODEC_LONG_NAME("8088flex TMV"),
90 .p.type = AVMEDIA_TYPE_VIDEO,
91 .p.id = AV_CODEC_ID_TMV,
92 .init = tmv_decode_init,
93 FF_CODEC_DECODE_CB(tmv_decode_frame),
94 .p.capabilities = AV_CODEC_CAP_DR1,
95 };
96