FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/mm.c
Date: 2025-01-20 09:27:23
Exec Total Coverage
Lines: 71 86 82.6%
Functions: 3 3 100.0%
Branches: 34 58 58.6%
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1 /*
2 * American Laser Games MM Format Demuxer
3 * Copyright (c) 2006 Peter Ross
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 * American Laser Games MM Format Demuxer
25 * by Peter Ross (pross@xvid.org)
26 *
27 * The MM format was used by IBM-PC ports of ALG's "arcade shooter" games,
28 * including Mad Dog McCree and Crime Patrol.
29 *
30 * Technical details here:
31 * http://wiki.multimedia.cx/index.php?title=American_Laser_Games_MM
32 */
33
34 #include "libavutil/channel_layout.h"
35 #include "libavutil/intreadwrite.h"
36 #include "avformat.h"
37 #include "demux.h"
38 #include "internal.h"
39
40 #define MM_PREAMBLE_SIZE 6
41
42 #define MM_TYPE_HEADER 0x0
43 #define MM_TYPE_RAW 0x2
44 #define MM_TYPE_INTER 0x5
45 #define MM_TYPE_INTRA 0x8
46 #define MM_TYPE_INTRA_HH 0xc
47 #define MM_TYPE_INTER_HH 0xd
48 #define MM_TYPE_INTRA_HHV 0xe
49 #define MM_TYPE_INTER_HHV 0xf
50 #define MM_TYPE_AUDIO2 0x14
51 #define MM_TYPE_AUDIO 0x15
52 #define MM_TYPE_PALETTE 0x31
53
54 #define MM_HEADER_LEN_V 0x16 /* video only */
55 #define MM_HEADER_LEN_AV 0x18 /* video + audio */
56 #define MM_HEADER_LEN_AV2 0x1a
57
58 #define MM_PALETTE_COUNT 128
59 #define MM_PALETTE_SIZE (MM_PALETTE_COUNT*3)
60
61 7203 static int probe(const AVProbeData *p)
62 {
63 int len, type, fps, w, h;
64
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 7203 if (p->buf_size < MM_HEADER_LEN_AV + MM_PREAMBLE_SIZE)
65 ✗ return 0;
66 /* the first chunk is always the header */
67
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 7203 if (AV_RL16(&p->buf[0]) != MM_TYPE_HEADER)
68 5797 return 0;
69 1406 len = AV_RL32(&p->buf[2]);
70
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 1406 if (len != MM_HEADER_LEN_V && len != MM_HEADER_LEN_AV && len != MM_HEADER_LEN_AV2)
71 1405 return 0;
72 1 fps = AV_RL16(&p->buf[8]);
73 1 w = AV_RL16(&p->buf[12]);
74 1 h = AV_RL16(&p->buf[14]);
75
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 1 if (!fps || fps > 60 || !w || w > 2048 || !h || h > 2048)
76 ✗ return 0;
77 1 type = AV_RL16(&p->buf[len]);
78
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 1 if (!type || type > 0x31)
79 ✗ return 0;
80
81 /* only return half certainty since this check is a bit sketchy */
82 1 return AVPROBE_SCORE_EXTENSION;
83 }
84
85 1 static int read_header(AVFormatContext *s)
86 {
87 1 AVIOContext *pb = s->pb;
88 AVStream *st;
89
90 unsigned int type, length;
91 unsigned int frame_rate, width, height;
92
93 1 type = avio_rl16(pb);
94 1 length = avio_rl32(pb);
95
96
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 1 if (type != MM_TYPE_HEADER || length < 10)
97 ✗ return AVERROR_INVALIDDATA;
98
99 /* read header */
100 1 avio_rl16(pb); /* total number of chunks */
101 1 frame_rate = avio_rl16(pb);
102 1 avio_rl16(pb); /* ibm-pc video bios mode */
103 1 width = avio_rl16(pb);
104 1 height = avio_rl16(pb);
105 1 avio_skip(pb, length - 10); /* unknown data */
106
107 /* video stream */
108 1 st = avformat_new_stream(s, NULL);
109
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 1 if (!st)
110 ✗ return AVERROR(ENOMEM);
111 1 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
112 1 st->codecpar->codec_id = AV_CODEC_ID_MMVIDEO;
113 1 st->codecpar->codec_tag = 0; /* no fourcc */
114 1 st->codecpar->width = width;
115 1 st->codecpar->height = height;
116 1 avpriv_set_pts_info(st, 64, 1, frame_rate);
117
118 /* audio stream */
119
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 1 if (length >= MM_HEADER_LEN_AV) {
120 1 st = avformat_new_stream(s, NULL);
121
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 1 if (!st)
122 ✗ return AVERROR(ENOMEM);
123 1 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
124 1 st->codecpar->codec_tag = 0; /* no fourcc */
125 1 st->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
126 1 st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
127 1 st->codecpar->sample_rate = 8000;
128 1 avpriv_set_pts_info(st, 64, 1, 8000); /* 8000 hz */
129 }
130
131 1 return 0;
132 }
133
134 100 static int read_packet(AVFormatContext *s,
135 AVPacket *pkt)
136 {
137 100 AVIOContext *pb = s->pb;
138 unsigned char preamble[MM_PREAMBLE_SIZE];
139 unsigned int type, length;
140 100 int64_t pos = avio_tell(pb);
141 int ret;
142
143 while (1) {
144
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 100 if (avio_feof(pb))
145 ✗ return AVERROR_EOF;
146
147
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 100 if (avio_read(pb, preamble, MM_PREAMBLE_SIZE) != MM_PREAMBLE_SIZE)
148 1 return AVERROR(EIO);
149
150 99 type = AV_RL16(&preamble[0]);
151 99 length = AV_RL16(&preamble[2]);
152
153
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 99 switch (type) {
154 32 case MM_TYPE_RAW :
155 case MM_TYPE_PALETTE :
156 case MM_TYPE_INTER :
157 case MM_TYPE_INTRA :
158 case MM_TYPE_INTRA_HH :
159 case MM_TYPE_INTER_HH :
160 case MM_TYPE_INTRA_HHV :
161 case MM_TYPE_INTER_HHV :
162 /* output preamble + data */
163
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 32 if ((ret = av_new_packet(pkt, length + MM_PREAMBLE_SIZE)) < 0)
164 ✗ return ret;
165 32 memcpy(pkt->data, preamble, MM_PREAMBLE_SIZE);
166
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 32 if (avio_read(pb, pkt->data + MM_PREAMBLE_SIZE, length) != length)
167 ✗ return AVERROR(EIO);
168 32 pkt->size = length + MM_PREAMBLE_SIZE;
169 32 pkt->stream_index = 0;
170
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 32 if (type!=MM_TYPE_PALETTE)
171 31 pkt->duration = 1;
172
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 32 if (type == MM_TYPE_RAW ||
173 type == MM_TYPE_INTRA)
174 31 pkt->flags |= AV_PKT_FLAG_KEY;
175 32 pkt->pos = pos;
176 32 return 0;
177
178 67 case MM_TYPE_AUDIO :
179
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 67 if (s->nb_streams < 2)
180 ✗ return AVERROR_INVALIDDATA;
181
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 67 if ((ret = av_get_packet(s->pb, pkt, length)) < 0)
182 ✗ return ret;
183 67 pkt->stream_index = 1;
184 67 pkt->duration = length;
185 67 pkt->pos = pos;
186 67 return 0;
187
188 ✗ default :
189 ✗ av_log(s, AV_LOG_INFO, "unknown chunk type 0x%x\n", type);
190 /* fallthrough */
191 ✗ case MM_TYPE_AUDIO2 :
192 ✗ avio_skip(pb, length);
193 }
194 }
195 }
196
197 const FFInputFormat ff_mm_demuxer = {
198 .p.name = "mm",
199 .p.long_name = NULL_IF_CONFIG_SMALL("American Laser Games MM"),
200 .p.flags = AVFMT_GENERIC_INDEX,
201 .read_probe = probe,
202 .read_header = read_header,
203 .read_packet = read_packet,
204 };
205