FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/tmv.c
Date: 2021-09-26 18:22:30
Exec Total Coverage
Lines: 28 29 96.6%
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 "internal.h"
33 #include "libavutil/internal.h"
34 #include "libavutil/xga_font_data.h"
35
36 #include "cga_data.h"
37
38 111 static int tmv_decode_frame(AVCodecContext *avctx, void *data,
39 int *got_frame, AVPacket *avpkt)
40 {
41 111 AVFrame *frame = data;
42 111 const uint8_t *src = avpkt->data;
43 uint8_t *dst;
44 111 unsigned char_cols = avctx->width >> 3;
45 111 unsigned char_rows = avctx->height >> 3;
46 unsigned x, y, fg, bg, c;
47 int ret;
48
49
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111 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
50 return ret;
51
52
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111 if (avpkt->size < 2*char_rows*char_cols) {
53 1 av_log(avctx, AV_LOG_ERROR,
54 "Input buffer too small, truncated sample?\n");
55 1 *got_frame = 0;
56 1 return AVERROR_INVALIDDATA;
57 }
58
59 110 frame->pict_type = AV_PICTURE_TYPE_I;
60 110 frame->key_frame = 1;
61 110 dst = frame->data[0];
62
63 110 frame->palette_has_changed = 1;
64 110 memcpy(frame->data[1], ff_cga_palette, 16 * 4);
65 110 memset(frame->data[1] + 16 * 4, 0, AVPALETTE_SIZE - 16 * 4);
66
67
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2860 for (y = 0; y < char_rows; y++) {
68
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112750 for (x = 0; x < char_cols; x++) {
69 110000 c = *src++;
70 110000 bg = *src >> 4;
71 110000 fg = *src++ & 0xF;
72 110000 ff_draw_pc_font(dst + x * 8, frame->linesize[0],
73 avpriv_cga_font, 8, c, fg, bg);
74 }
75 2750 dst += frame->linesize[0] * 8;
76 }
77
78 110 *got_frame = 1;
79
80 110 return avpkt->size;
81 }
82
83 2 static av_cold int tmv_decode_init(AVCodecContext *avctx)
84 {
85 2 avctx->pix_fmt = AV_PIX_FMT_PAL8;
86 2 return 0;
87 }
88
89 const AVCodec ff_tmv_decoder = {
90 .name = "tmv",
91 .long_name = NULL_IF_CONFIG_SMALL("8088flex TMV"),
92 .type = AVMEDIA_TYPE_VIDEO,
93 .id = AV_CODEC_ID_TMV,
94 .init = tmv_decode_init,
95 .decode = tmv_decode_frame,
96 .capabilities = AV_CODEC_CAP_DR1,
97 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
98 };
99