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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->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
51 | st->codec->width = avio_rl32(s->pb); | |
52 | st->codec->height = avio_rl32(s->pb); | |
53 | st->codec->codec_id = AV_CODEC_ID_H264; | |
54 | st->need_parsing = AVSTREAM_PARSE_FULL; | |
55 | ||
56 | ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
57 | ast->codec->channels = 1; | |
58 | ast->codec->sample_rate = 8000; | |
59 | ast->codec->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_free_packet(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 | }; |