Commit | Line | Data |
---|---|---|
2ba45a60 DM |
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 "internal.h" | |
38 | ||
39 | #define MM_PREAMBLE_SIZE 6 | |
40 | ||
41 | #define MM_TYPE_HEADER 0x0 | |
42 | #define MM_TYPE_INTER 0x5 | |
43 | #define MM_TYPE_INTRA 0x8 | |
44 | #define MM_TYPE_INTRA_HH 0xc | |
45 | #define MM_TYPE_INTER_HH 0xd | |
46 | #define MM_TYPE_INTRA_HHV 0xe | |
47 | #define MM_TYPE_INTER_HHV 0xf | |
48 | #define MM_TYPE_AUDIO 0x15 | |
49 | #define MM_TYPE_PALETTE 0x31 | |
50 | ||
51 | #define MM_HEADER_LEN_V 0x16 /* video only */ | |
52 | #define MM_HEADER_LEN_AV 0x18 /* video + audio */ | |
53 | ||
54 | #define MM_PALETTE_COUNT 128 | |
55 | #define MM_PALETTE_SIZE (MM_PALETTE_COUNT*3) | |
56 | ||
57 | typedef struct { | |
58 | unsigned int audio_pts, video_pts; | |
59 | } MmDemuxContext; | |
60 | ||
61 | static int probe(AVProbeData *p) | |
62 | { | |
63 | int len, type, fps, w, h; | |
64 | if (p->buf_size < MM_HEADER_LEN_AV + MM_PREAMBLE_SIZE) | |
65 | return 0; | |
66 | /* the first chunk is always the header */ | |
67 | if (AV_RL16(&p->buf[0]) != MM_TYPE_HEADER) | |
68 | return 0; | |
69 | len = AV_RL32(&p->buf[2]); | |
70 | if (len != MM_HEADER_LEN_V && len != MM_HEADER_LEN_AV) | |
71 | return 0; | |
72 | fps = AV_RL16(&p->buf[8]); | |
73 | w = AV_RL16(&p->buf[12]); | |
74 | h = AV_RL16(&p->buf[14]); | |
75 | if (!fps || fps > 60 || !w || w > 2048 || !h || h > 2048) | |
76 | return 0; | |
77 | type = AV_RL16(&p->buf[len]); | |
78 | if (!type || type > 0x31) | |
79 | return 0; | |
80 | ||
81 | /* only return half certainty since this check is a bit sketchy */ | |
82 | return AVPROBE_SCORE_EXTENSION; | |
83 | } | |
84 | ||
85 | static int read_header(AVFormatContext *s) | |
86 | { | |
87 | MmDemuxContext *mm = s->priv_data; | |
88 | AVIOContext *pb = s->pb; | |
89 | AVStream *st; | |
90 | ||
91 | unsigned int type, length; | |
92 | unsigned int frame_rate, width, height; | |
93 | ||
94 | type = avio_rl16(pb); | |
95 | length = avio_rl32(pb); | |
96 | ||
97 | if (type != MM_TYPE_HEADER) | |
98 | return AVERROR_INVALIDDATA; | |
99 | ||
100 | /* read header */ | |
101 | avio_rl16(pb); /* total number of chunks */ | |
102 | frame_rate = avio_rl16(pb); | |
103 | avio_rl16(pb); /* ibm-pc video bios mode */ | |
104 | width = avio_rl16(pb); | |
105 | height = avio_rl16(pb); | |
106 | avio_skip(pb, length - 10); /* unknown data */ | |
107 | ||
108 | /* video stream */ | |
109 | st = avformat_new_stream(s, NULL); | |
110 | if (!st) | |
111 | return AVERROR(ENOMEM); | |
112 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
113 | st->codec->codec_id = AV_CODEC_ID_MMVIDEO; | |
114 | st->codec->codec_tag = 0; /* no fourcc */ | |
115 | st->codec->width = width; | |
116 | st->codec->height = height; | |
117 | avpriv_set_pts_info(st, 64, 1, frame_rate); | |
118 | ||
119 | /* audio stream */ | |
120 | if (length == MM_HEADER_LEN_AV) { | |
121 | st = avformat_new_stream(s, NULL); | |
122 | if (!st) | |
123 | return AVERROR(ENOMEM); | |
124 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
125 | st->codec->codec_tag = 0; /* no fourcc */ | |
126 | st->codec->codec_id = AV_CODEC_ID_PCM_U8; | |
127 | st->codec->channels = 1; | |
128 | st->codec->channel_layout = AV_CH_LAYOUT_MONO; | |
129 | st->codec->sample_rate = 8000; | |
130 | avpriv_set_pts_info(st, 64, 1, 8000); /* 8000 hz */ | |
131 | } | |
132 | ||
133 | mm->audio_pts = 0; | |
134 | mm->video_pts = 0; | |
135 | return 0; | |
136 | } | |
137 | ||
138 | static int read_packet(AVFormatContext *s, | |
139 | AVPacket *pkt) | |
140 | { | |
141 | MmDemuxContext *mm = s->priv_data; | |
142 | AVIOContext *pb = s->pb; | |
143 | unsigned char preamble[MM_PREAMBLE_SIZE]; | |
144 | unsigned int type, length; | |
145 | ||
146 | while(1) { | |
147 | ||
148 | if (avio_read(pb, preamble, MM_PREAMBLE_SIZE) != MM_PREAMBLE_SIZE) { | |
149 | return AVERROR(EIO); | |
150 | } | |
151 | ||
152 | type = AV_RL16(&preamble[0]); | |
153 | length = AV_RL16(&preamble[2]); | |
154 | ||
155 | switch(type) { | |
156 | case MM_TYPE_PALETTE : | |
157 | case MM_TYPE_INTER : | |
158 | case MM_TYPE_INTRA : | |
159 | case MM_TYPE_INTRA_HH : | |
160 | case MM_TYPE_INTER_HH : | |
161 | case MM_TYPE_INTRA_HHV : | |
162 | case MM_TYPE_INTER_HHV : | |
163 | /* output preamble + data */ | |
164 | if (av_new_packet(pkt, length + MM_PREAMBLE_SIZE)) | |
165 | return AVERROR(ENOMEM); | |
166 | memcpy(pkt->data, preamble, MM_PREAMBLE_SIZE); | |
167 | if (avio_read(pb, pkt->data + MM_PREAMBLE_SIZE, length) != length) | |
168 | return AVERROR(EIO); | |
169 | pkt->size = length + MM_PREAMBLE_SIZE; | |
170 | pkt->stream_index = 0; | |
171 | pkt->pts = mm->video_pts; | |
172 | if (type!=MM_TYPE_PALETTE) | |
173 | mm->video_pts++; | |
174 | return 0; | |
175 | ||
176 | case MM_TYPE_AUDIO : | |
177 | if (av_get_packet(s->pb, pkt, length)<0) | |
178 | return AVERROR(ENOMEM); | |
179 | pkt->stream_index = 1; | |
180 | pkt->pts = mm->audio_pts++; | |
181 | return 0; | |
182 | ||
183 | default : | |
184 | av_log(s, AV_LOG_INFO, "unknown chunk type 0x%x\n", type); | |
185 | avio_skip(pb, length); | |
186 | } | |
187 | } | |
188 | } | |
189 | ||
190 | AVInputFormat ff_mm_demuxer = { | |
191 | .name = "mm", | |
192 | .long_name = NULL_IF_CONFIG_SMALL("American Laser Games MM"), | |
193 | .priv_data_size = sizeof(MmDemuxContext), | |
194 | .read_probe = probe, | |
195 | .read_header = read_header, | |
196 | .read_packet = read_packet, | |
197 | }; |