blob: 077d905b4bfd5d2f378d4d350e3439a6ea6623bc
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->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
49 | st->codecpar->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_packet_unref(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 | }; |
119 |