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2ba45a60 DM |
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 | AVCodecContext *enc; | |
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 | enc = s->streams[0]->codec; | |
38 | ||
39 | if (enc->codec_id != AV_CODEC_ID_ILBC) { | |
40 | av_log(s, AV_LOG_ERROR, "Unsupported codec\n"); | |
41 | return AVERROR(EINVAL); | |
42 | } | |
43 | ||
44 | if (enc->block_align == 50) { | |
45 | avio_write(pb, mode30_header, sizeof(mode30_header) - 1); | |
46 | } else if (enc->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->codec->codec_id = AV_CODEC_ID_ILBC; | |
83 | st->codec->sample_rate = 8000; | |
84 | st->codec->channels = 1; | |
85 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
86 | st->start_time = 0; | |
87 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); | |
88 | if (!memcmp(header, mode20_header, sizeof(mode20_header) - 1)) { | |
89 | st->codec->block_align = 38; | |
90 | st->codec->bit_rate = 15200; | |
91 | } else if (!memcmp(header, mode30_header, sizeof(mode30_header) - 1)) { | |
92 | st->codec->block_align = 50; | |
93 | st->codec->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 | AVCodecContext *enc = s->streams[0]->codec; | |
106 | int ret; | |
107 | ||
108 | if ((ret = av_new_packet(pkt, enc->block_align)) < 0) | |
109 | return ret; | |
110 | ||
111 | pkt->stream_index = 0; | |
112 | pkt->pos = avio_tell(s->pb); | |
113 | pkt->duration = enc->block_align == 38 ? 160 : 240; | |
114 | if ((ret = avio_read(s->pb, pkt->data, enc->block_align)) != enc->block_align) { | |
115 | av_free_packet(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 | }; |