blob: 50e3c3cc769d56b5bbb82e06da47087f9fb12b80
1 | /* |
2 | * iLBC storage file format |
3 | * Copyright (c) 2012 Martin Storsjo |
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 "avformat.h" |
23 | #include "internal.h" |
24 | |
25 | static const char mode20_header[] = "#!iLBC20\n"; |
26 | static const char mode30_header[] = "#!iLBC30\n"; |
27 | |
28 | static int ilbc_write_header(AVFormatContext *s) |
29 | { |
30 | AVIOContext *pb = s->pb; |
31 | AVCodecParameters *par; |
32 | |
33 | if (s->nb_streams != 1) { |
34 | av_log(s, AV_LOG_ERROR, "Unsupported number of streams\n"); |
35 | return AVERROR(EINVAL); |
36 | } |
37 | par = s->streams[0]->codecpar; |
38 | |
39 | if (par->codec_id != AV_CODEC_ID_ILBC) { |
40 | av_log(s, AV_LOG_ERROR, "Unsupported codec\n"); |
41 | return AVERROR(EINVAL); |
42 | } |
43 | |
44 | if (par->block_align == 50) { |
45 | avio_write(pb, mode30_header, sizeof(mode30_header) - 1); |
46 | } else if (par->block_align == 38) { |
47 | avio_write(pb, mode20_header, sizeof(mode20_header) - 1); |
48 | } else { |
49 | av_log(s, AV_LOG_ERROR, "Unsupported mode\n"); |
50 | return AVERROR(EINVAL); |
51 | } |
52 | avio_flush(pb); |
53 | return 0; |
54 | } |
55 | |
56 | static int ilbc_write_packet(AVFormatContext *s, AVPacket *pkt) |
57 | { |
58 | avio_write(s->pb, pkt->data, pkt->size); |
59 | return 0; |
60 | } |
61 | |
62 | static int ilbc_probe(AVProbeData *p) |
63 | { |
64 | // Only check for "#!iLBC" which matches both formats |
65 | if (!memcmp(p->buf, mode20_header, 6)) |
66 | return AVPROBE_SCORE_MAX; |
67 | else |
68 | return 0; |
69 | } |
70 | |
71 | static int ilbc_read_header(AVFormatContext *s) |
72 | { |
73 | AVIOContext *pb = s->pb; |
74 | AVStream *st; |
75 | uint8_t header[9]; |
76 | |
77 | avio_read(pb, header, 9); |
78 | |
79 | st = avformat_new_stream(s, NULL); |
80 | if (!st) |
81 | return AVERROR(ENOMEM); |
82 | st->codecpar->codec_id = AV_CODEC_ID_ILBC; |
83 | st->codecpar->sample_rate = 8000; |
84 | st->codecpar->channels = 1; |
85 | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
86 | st->start_time = 0; |
87 | avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
88 | if (!memcmp(header, mode20_header, sizeof(mode20_header) - 1)) { |
89 | st->codecpar->block_align = 38; |
90 | st->codecpar->bit_rate = 15200; |
91 | } else if (!memcmp(header, mode30_header, sizeof(mode30_header) - 1)) { |
92 | st->codecpar->block_align = 50; |
93 | st->codecpar->bit_rate = 13333; |
94 | } else { |
95 | av_log(s, AV_LOG_ERROR, "Unrecognized iLBC file header\n"); |
96 | return AVERROR_INVALIDDATA; |
97 | } |
98 | |
99 | return 0; |
100 | } |
101 | |
102 | static int ilbc_read_packet(AVFormatContext *s, |
103 | AVPacket *pkt) |
104 | { |
105 | AVCodecParameters *par = s->streams[0]->codecpar; |
106 | int ret; |
107 | |
108 | if ((ret = av_new_packet(pkt, par->block_align)) < 0) |
109 | return ret; |
110 | |
111 | pkt->stream_index = 0; |
112 | pkt->pos = avio_tell(s->pb); |
113 | pkt->duration = par->block_align == 38 ? 160 : 240; |
114 | if ((ret = avio_read(s->pb, pkt->data, par->block_align)) != par->block_align) { |
115 | av_packet_unref(pkt); |
116 | return ret < 0 ? ret : AVERROR(EIO); |
117 | } |
118 | |
119 | return 0; |
120 | } |
121 | |
122 | AVInputFormat ff_ilbc_demuxer = { |
123 | .name = "ilbc", |
124 | .long_name = NULL_IF_CONFIG_SMALL("iLBC storage"), |
125 | .read_probe = ilbc_probe, |
126 | .read_header = ilbc_read_header, |
127 | .read_packet = ilbc_read_packet, |
128 | .flags = AVFMT_GENERIC_INDEX, |
129 | }; |
130 | |
131 | AVOutputFormat ff_ilbc_muxer = { |
132 | .name = "ilbc", |
133 | .long_name = NULL_IF_CONFIG_SMALL("iLBC storage"), |
134 | .mime_type = "audio/iLBC", |
135 | .extensions = "lbc", |
136 | .audio_codec = AV_CODEC_ID_ILBC, |
137 | .write_header = ilbc_write_header, |
138 | .write_packet = ilbc_write_packet, |
139 | .flags = AVFMT_NOTIMESTAMPS, |
140 | }; |
141 |