cosmetics: msnwc_tcp: Reformat
[libav.git] / libavformat / msnwc_tcp.c
CommitLineData
0f3444e1 1/*
cbf5d22d 2 * Copyright (C) 2008 Ramiro Polla
0f3444e1 3 *
2912e87a 4 * This file is part of Libav.
0f3444e1 5 *
2912e87a 6 * Libav is free software; you can redistribute it and/or
0f3444e1
RP
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 *
2912e87a 11 * Libav is distributed in the hope that it will be useful,
0f3444e1
RP
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
2912e87a 17 * License along with Libav; if not, write to the Free Software
0f3444e1
RP
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
245976da 21#include "libavcodec/bytestream.h"
0f3444e1 22#include "avformat.h"
c3f9ebf7 23#include "internal.h"
0f3444e1
RP
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
39static int msnwc_tcp_probe(AVProbeData *p)
40{
41 int i;
42
f8d10511 43 for (i = 0; i + HEADER_SIZE <= p->buf_size; i++) {
0f3444e1
RP
44 uint16_t width, height;
45 uint32_t fourcc;
f8d10511 46 const uint8_t *bytestream = p->buf + i;
0f3444e1 47
f8d10511 48 if (bytestream_get_le16(&bytestream) != HEADER_SIZE)
0f3444e1
RP
49 continue;
50 width = bytestream_get_le16(&bytestream);
51 height = bytestream_get_le16(&bytestream);
f8d10511
LB
52 if (!(width == 320 &&
53 height == 240) && !(width == 160 && height == 120))
0f3444e1
RP
54 continue;
55 bytestream += 2; // keyframe
56 bytestream += 4; // size
f8d10511
LB
57 fourcc = bytestream_get_le32(&bytestream);
58 if (fourcc != MKTAG('M', 'L', '2', '0'))
0f3444e1
RP
59 continue;
60
f8d10511
LB
61 if (i) {
62 if (i < 14) /* starts with SwitchBoard connection info */
0f3444e1
RP
63 return AVPROBE_SCORE_MAX / 2;
64 else /* starts in the middle of stream */
65 return AVPROBE_SCORE_MAX / 3;
66 } else {
67 return AVPROBE_SCORE_MAX;
68 }
69 }
70
71 return -1;
72}
73
6e9651d1 74static int msnwc_tcp_read_header(AVFormatContext *ctx)
0f3444e1 75{
ae628ec1 76 AVIOContext *pb = ctx->pb;
0f3444e1
RP
77 AVCodecContext *codec;
78 AVStream *st;
79
3b3bbdd3 80 st = avformat_new_stream(ctx, NULL);
f8d10511 81 if (!st)
2874c81c 82 return AVERROR(ENOMEM);
0f3444e1 83
f8d10511 84 codec = st->codec;
72415b2a 85 codec->codec_type = AVMEDIA_TYPE_VIDEO;
f8d10511
LB
86 codec->codec_id = AV_CODEC_ID_MIMIC;
87 codec->codec_tag = MKTAG('M', 'L', '2', '0');
0f3444e1 88
c3f9ebf7 89 avpriv_set_pts_info(st, 32, 1, 1000);
0f3444e1
RP
90
91 /* Some files start with "connected\r\n\r\n".
92 * So skip until we find the first byte of struct size */
f8d10511 93 while (avio_r8(pb) != HEADER_SIZE && !pb->eof_reached) ;
0f3444e1 94
f8d10511 95 if (pb->eof_reached) {
0f3444e1
RP
96 av_log(ctx, AV_LOG_ERROR, "Could not find valid start.");
97 return -1;
98 }
99
100 return 0;
101}
102
103static int msnwc_tcp_read_packet(AVFormatContext *ctx, AVPacket *pkt)
104{
ae628ec1 105 AVIOContext *pb = ctx->pb;
0f3444e1
RP
106 uint16_t keyframe;
107 uint32_t size, timestamp;
4dfbc7a7 108 int ret;
0f3444e1 109
45a8a02a
AK
110 avio_skip(pb, 1); /* one byte has been read ahead */
111 avio_skip(pb, 2);
112 avio_skip(pb, 2);
b7effd4e 113 keyframe = avio_rl16(pb);
f8d10511 114 size = avio_rl32(pb);
45a8a02a
AK
115 avio_skip(pb, 4);
116 avio_skip(pb, 4);
b7effd4e 117 timestamp = avio_rl32(pb);
0f3444e1 118
4dfbc7a7
LB
119 if (!size)
120 return AVERROR_INVALIDDATA;
121
122 if ((ret = av_get_packet(pb, pkt, size)) < 0)
123 return ret;
0f3444e1 124
45a8a02a 125 avio_skip(pb, 1); /* Read ahead one byte of struct size like read_header */
0f3444e1 126
f8d10511
LB
127 pkt->pts = timestamp;
128 pkt->dts = timestamp;
0f3444e1
RP
129 pkt->stream_index = 0;
130
131 /* Some aMsn generated videos (or was it Mercury Messenger?) don't set
132 * this bit and rely on the codec to get keyframe information */
f8d10511 133 if (keyframe & 1)
cc947f04 134 pkt->flags |= AV_PKT_FLAG_KEY;
0f3444e1
RP
135
136 return HEADER_SIZE + size;
137}
138
c6610a21 139AVInputFormat ff_msnwc_tcp_demuxer = {
f8d10511
LB
140 .name = "msnwctcp",
141 .long_name = NULL_IF_CONFIG_SMALL("MSN TCP Webcam stream"),
142 .read_probe = msnwc_tcp_probe,
143 .read_header = msnwc_tcp_read_header,
144 .read_packet = msnwc_tcp_read_packet,
0f3444e1 145};