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1 | /* |
2 | * Copyright (C) 2008 Ramiro Polla | |
3 | * | |
4 | * This file is part of FFmpeg. | |
5 | * | |
6 | * FFmpeg is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2.1 of the License, or (at your option) any later version. | |
10 | * | |
11 | * FFmpeg is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with FFmpeg; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include "libavcodec/bytestream.h" | |
22 | #include "avformat.h" | |
23 | #include "internal.h" | |
24 | ||
25 | #define HEADER_SIZE 24 | |
26 | ||
27 | /* | |
28 | * Header structure: | |
29 | * uint16_t ss; // struct size | |
30 | * uint16_t width; // frame width | |
31 | * uint16_t height; // frame height | |
32 | * uint16_t ff; // keyframe + some other info(???) | |
33 | * uint32_t size; // size of data | |
34 | * uint32_t fourcc; // ML20 | |
35 | * uint32_t u3; // ? | |
36 | * uint32_t ts; // time | |
37 | */ | |
38 | ||
39 | static int msnwc_tcp_probe(AVProbeData *p) | |
40 | { | |
41 | int i; | |
42 | ||
43 | for(i = 0 ; i + HEADER_SIZE <= p->buf_size ; i++) { | |
44 | uint16_t width, height; | |
45 | uint32_t fourcc; | |
46 | const uint8_t *bytestream = p->buf+i; | |
47 | ||
48 | if(bytestream_get_le16(&bytestream) != HEADER_SIZE) | |
49 | continue; | |
50 | width = bytestream_get_le16(&bytestream); | |
51 | height = bytestream_get_le16(&bytestream); | |
52 | if(!(width==320 && height==240) && !(width==160 && height==120)) | |
53 | continue; | |
54 | bytestream += 2; // keyframe | |
55 | bytestream += 4; // size | |
56 | fourcc = bytestream_get_le32(&bytestream); | |
57 | if(fourcc != MKTAG('M', 'L', '2', '0')) | |
58 | continue; | |
59 | ||
60 | if(i) { | |
61 | if(i < 14) /* starts with SwitchBoard connection info */ | |
62 | return AVPROBE_SCORE_MAX / 2; | |
63 | else /* starts in the middle of stream */ | |
64 | return AVPROBE_SCORE_MAX / 3; | |
65 | } else { | |
66 | return AVPROBE_SCORE_MAX; | |
67 | } | |
68 | } | |
69 | ||
70 | return -1; | |
71 | } | |
72 | ||
73 | static int msnwc_tcp_read_header(AVFormatContext *ctx) | |
74 | { | |
75 | AVIOContext *pb = ctx->pb; | |
76 | AVCodecContext *codec; | |
77 | AVStream *st; | |
78 | ||
79 | st = avformat_new_stream(ctx, NULL); | |
80 | if(!st) | |
81 | return AVERROR(ENOMEM); | |
82 | ||
83 | codec = st->codec; | |
84 | codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
85 | codec->codec_id = AV_CODEC_ID_MIMIC; | |
86 | codec->codec_tag = MKTAG('M', 'L', '2', '0'); | |
87 | ||
88 | avpriv_set_pts_info(st, 32, 1, 1000); | |
89 | ||
90 | /* Some files start with "connected\r\n\r\n". | |
91 | * So skip until we find the first byte of struct size */ | |
92 | while(avio_r8(pb) != HEADER_SIZE && !avio_feof(pb)); | |
93 | ||
94 | if(avio_feof(pb)) { | |
95 | av_log(ctx, AV_LOG_ERROR, "Could not find valid start.\n"); | |
96 | return -1; | |
97 | } | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
102 | static int msnwc_tcp_read_packet(AVFormatContext *ctx, AVPacket *pkt) | |
103 | { | |
104 | AVIOContext *pb = ctx->pb; | |
105 | uint16_t keyframe; | |
106 | uint32_t size, timestamp; | |
107 | ||
108 | avio_skip(pb, 1); /* one byte has been read ahead */ | |
109 | avio_skip(pb, 2); | |
110 | avio_skip(pb, 2); | |
111 | keyframe = avio_rl16(pb); | |
112 | size = avio_rl32(pb); | |
113 | avio_skip(pb, 4); | |
114 | avio_skip(pb, 4); | |
115 | timestamp = avio_rl32(pb); | |
116 | ||
117 | if(!size || av_get_packet(pb, pkt, size) != size) | |
118 | return -1; | |
119 | ||
120 | avio_skip(pb, 1); /* Read ahead one byte of struct size like read_header */ | |
121 | ||
122 | pkt->pts = timestamp; | |
123 | pkt->dts = timestamp; | |
124 | pkt->stream_index = 0; | |
125 | ||
126 | /* Some aMsn generated videos (or was it Mercury Messenger?) don't set | |
127 | * this bit and rely on the codec to get keyframe information */ | |
128 | if(keyframe&1) | |
129 | pkt->flags |= AV_PKT_FLAG_KEY; | |
130 | ||
131 | return HEADER_SIZE + size; | |
132 | } | |
133 | ||
134 | AVInputFormat ff_msnwc_tcp_demuxer = { | |
135 | .name = "msnwctcp", | |
136 | .long_name = NULL_IF_CONFIG_SMALL("MSN TCP Webcam stream"), | |
137 | .read_probe = msnwc_tcp_probe, | |
138 | .read_header = msnwc_tcp_read_header, | |
139 | .read_packet = msnwc_tcp_read_packet, | |
140 | }; |