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1 | /* |
2 | * Copyright (c) 2009 Michael Niedermayer | |
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 "avformat.h" | |
22 | #include "internal.h" | |
23 | ||
24 | ||
25 | static int probe(AVProbeData *p) | |
26 | { | |
27 | // the single file I have starts with that, I do not know if others do, too | |
28 | if( p->buf[0] == 1 | |
29 | && p->buf[1] == 1 | |
30 | && p->buf[2] == 3 | |
31 | && p->buf[3] == 0xB8 | |
32 | && p->buf[4] == 0x80 | |
33 | && p->buf[5] == 0x60 | |
34 | ) | |
35 | return AVPROBE_SCORE_MAX-2; | |
36 | ||
37 | return 0; | |
38 | } | |
39 | ||
40 | static int read_header(AVFormatContext *s) | |
41 | { | |
42 | AVStream *st; | |
43 | ||
44 | st = avformat_new_stream(s, NULL); | |
45 | if (!st) | |
46 | return AVERROR(ENOMEM); | |
47 | ||
48 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
49 | st->codec->codec_id = AV_CODEC_ID_MPEG4; | |
50 | st->need_parsing = AVSTREAM_PARSE_FULL; | |
51 | avpriv_set_pts_info(st, 64, 1, 90000); | |
52 | ||
53 | return 0; | |
54 | ||
55 | } | |
56 | ||
57 | static int read_packet(AVFormatContext *s, AVPacket *pkt) | |
58 | { | |
59 | int ret, size, pts, type, flags; | |
60 | int first_pkt = 0; | |
61 | int frame_complete = 0; | |
62 | ||
63 | while (!frame_complete) { | |
64 | ||
65 | type = avio_rb16(s->pb); // 257 or 258 | |
66 | size = avio_rb16(s->pb); | |
67 | flags = avio_rb16(s->pb); //some flags, 0x80 indicates end of frame | |
68 | avio_rb16(s->pb); //packet number | |
69 | pts = avio_rb32(s->pb); | |
70 | avio_rb32(s->pb); //6A 13 E3 88 | |
71 | ||
72 | frame_complete = flags & 0x80; | |
73 | ||
74 | size -= 12; | |
75 | if (size < 1) | |
76 | return -1; | |
77 | ||
78 | if (type == 258) { | |
79 | avio_skip(s->pb, size); | |
80 | frame_complete = 0; | |
81 | continue; | |
82 | } | |
83 | ||
84 | if (!first_pkt) { | |
85 | ret = av_get_packet(s->pb, pkt, size); | |
86 | if (ret < 0) | |
87 | return ret; | |
88 | first_pkt = 1; | |
89 | pkt->pts = pts; | |
90 | pkt->pos -= 16; | |
91 | } else { | |
92 | ret = av_append_packet(s->pb, pkt, size); | |
93 | if (ret < 0) { | |
94 | av_log(s, AV_LOG_ERROR, "failed to grow packet\n"); | |
95 | av_free_packet(pkt); | |
96 | return ret; | |
97 | } | |
98 | } | |
99 | if (ret < size) { | |
100 | av_log(s, AV_LOG_ERROR, "Truncated packet! Read %d of %d bytes\n", | |
101 | ret, size); | |
102 | pkt->flags |= AV_PKT_FLAG_CORRUPT; | |
103 | break; | |
104 | } | |
105 | } | |
106 | pkt->stream_index = 0; | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | AVInputFormat ff_iv8_demuxer = { | |
112 | .name = "iv8", | |
113 | .long_name = NULL_IF_CONFIG_SMALL("IndigoVision 8000 video"), | |
114 | .read_probe = probe, | |
115 | .read_header = read_header, | |
116 | .read_packet = read_packet, | |
117 | .flags = AVFMT_GENERIC_INDEX, | |
118 | }; |