blob: c9953336c5a48f4e03f4b3844214f4b61a180a0f
1 | /* |
2 | * SDR2 demuxer |
3 | * Copyright (c) 2014 Paul B Mahol |
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 | #include "libavutil/intreadwrite.h" |
23 | #include "avformat.h" |
24 | #include "internal.h" |
25 | |
26 | static int sdr2_probe(AVProbeData *p) |
27 | { |
28 | if (AV_RL32(p->buf) != MKTAG('S', 'R', 'A', 1)) |
29 | return 0; |
30 | |
31 | return AVPROBE_SCORE_EXTENSION; |
32 | } |
33 | |
34 | #define FIRST 0xA8 |
35 | |
36 | static int sdr2_read_header(AVFormatContext *s) |
37 | { |
38 | AVStream *st, *ast; |
39 | |
40 | ast = avformat_new_stream(s, 0); |
41 | if (!ast) |
42 | return AVERROR(ENOMEM); |
43 | |
44 | st = avformat_new_stream(s, 0); |
45 | if (!st) |
46 | return AVERROR(ENOMEM); |
47 | |
48 | avio_skip(s->pb, 20); |
49 | avpriv_set_pts_info(st, 64, 1, avio_rl32(s->pb)); |
50 | st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
51 | st->codecpar->width = avio_rl32(s->pb); |
52 | st->codecpar->height = avio_rl32(s->pb); |
53 | st->codecpar->codec_id = AV_CODEC_ID_H264; |
54 | st->need_parsing = AVSTREAM_PARSE_FULL; |
55 | |
56 | ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
57 | ast->codecpar->channels = 1; |
58 | ast->codecpar->sample_rate = 8000; |
59 | ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE; |
60 | avpriv_set_pts_info(ast, 64, 1, 8000); |
61 | |
62 | avio_seek(s->pb, FIRST, SEEK_SET); |
63 | |
64 | return 0; |
65 | } |
66 | |
67 | static const uint8_t header[24] = { |
68 | 0x00, 0x00, 0x00, 0x01, 0x67, 0x42, 0x00, 0x1e, |
69 | 0xa6, 0x80, 0xb0, 0x7e, 0x40, 0x00, 0x00, 0x00, |
70 | 0x01, 0x68, 0xce, 0x38, 0x80, 0x00, 0x00, 0x00 |
71 | }; |
72 | |
73 | static int sdr2_read_packet(AVFormatContext *s, AVPacket *pkt) |
74 | { |
75 | int64_t pos; |
76 | unsigned next; |
77 | int flags, ret = 0, is_video; |
78 | |
79 | pos = avio_tell(s->pb); |
80 | |
81 | flags = avio_rl32(s->pb); |
82 | avio_skip(s->pb, 4); |
83 | |
84 | next = avio_rl32(s->pb); |
85 | if (next <= 52) |
86 | return AVERROR_INVALIDDATA; |
87 | |
88 | avio_skip(s->pb, 6); |
89 | is_video = avio_rl32(s->pb); |
90 | avio_skip(s->pb, 30); |
91 | |
92 | if (pos == FIRST) { |
93 | if (av_new_packet(pkt, next - 52 + 24) < 0) |
94 | return AVERROR(ENOMEM); |
95 | memcpy(pkt->data, header, 24); |
96 | ret = avio_read(s->pb, pkt->data + 24, next - 52); |
97 | if (ret < 0) { |
98 | av_packet_unref(pkt); |
99 | return ret; |
100 | } |
101 | av_shrink_packet(pkt, ret + 24); |
102 | } else { |
103 | ret = av_get_packet(s->pb, pkt, next - 52); |
104 | } |
105 | pkt->stream_index = !!is_video; |
106 | pkt->pos = pos; |
107 | if (flags & (1 << 12)) |
108 | pkt->flags |= AV_PKT_FLAG_KEY; |
109 | |
110 | return ret; |
111 | } |
112 | |
113 | AVInputFormat ff_sdr2_demuxer = { |
114 | .name = "sdr2", |
115 | .long_name = NULL_IF_CONFIG_SMALL("SDR2"), |
116 | .read_probe = sdr2_probe, |
117 | .read_header = sdr2_read_header, |
118 | .read_packet = sdr2_read_packet, |
119 | .extensions = "sdr2", |
120 | .flags = AVFMT_GENERIC_INDEX, |
121 | }; |
122 |