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2ba45a60 DM |
1 | /* |
2 | * amr file format | |
3 | * Copyright (c) 2001 ffmpeg project | |
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 | /* | |
23 | Write and read amr data according to RFC3267, http://www.ietf.org/rfc/rfc3267.txt?number=3267 | |
24 | ||
25 | Only mono files are supported. | |
26 | ||
27 | */ | |
28 | ||
29 | #include "libavutil/channel_layout.h" | |
30 | #include "avformat.h" | |
31 | #include "internal.h" | |
32 | ||
33 | typedef struct { | |
34 | uint64_t cumulated_size; | |
35 | uint64_t block_count; | |
36 | } AMRContext; | |
37 | ||
38 | static const char AMR_header[] = "#!AMR\n"; | |
39 | static const char AMRWB_header[] = "#!AMR-WB\n"; | |
40 | ||
41 | #if CONFIG_AMR_MUXER | |
42 | static int amr_write_header(AVFormatContext *s) | |
43 | { | |
44 | AVIOContext *pb = s->pb; | |
45 | AVCodecContext *enc = s->streams[0]->codec; | |
46 | ||
47 | s->priv_data = NULL; | |
48 | ||
49 | if (enc->codec_id == AV_CODEC_ID_AMR_NB) { | |
50 | avio_write(pb, AMR_header, sizeof(AMR_header) - 1); /* magic number */ | |
51 | } else if (enc->codec_id == AV_CODEC_ID_AMR_WB) { | |
52 | avio_write(pb, AMRWB_header, sizeof(AMRWB_header) - 1); /* magic number */ | |
53 | } else { | |
54 | return -1; | |
55 | } | |
56 | avio_flush(pb); | |
57 | return 0; | |
58 | } | |
59 | ||
60 | static int amr_write_packet(AVFormatContext *s, AVPacket *pkt) | |
61 | { | |
62 | avio_write(s->pb, pkt->data, pkt->size); | |
63 | return 0; | |
64 | } | |
65 | #endif /* CONFIG_AMR_MUXER */ | |
66 | ||
67 | static int amr_probe(AVProbeData *p) | |
68 | { | |
69 | // Only check for "#!AMR" which could be amr-wb, amr-nb. | |
70 | // This will also trigger multichannel files: "#!AMR_MC1.0\n" and | |
71 | // "#!AMR-WB_MC1.0\n" (not supported) | |
72 | ||
73 | if (!memcmp(p->buf, AMR_header, 5)) | |
74 | return AVPROBE_SCORE_MAX; | |
75 | else | |
76 | return 0; | |
77 | } | |
78 | ||
79 | /* amr input */ | |
80 | static int amr_read_header(AVFormatContext *s) | |
81 | { | |
82 | AVIOContext *pb = s->pb; | |
83 | AVStream *st; | |
84 | uint8_t header[9]; | |
85 | ||
86 | avio_read(pb, header, 6); | |
87 | ||
88 | st = avformat_new_stream(s, NULL); | |
89 | if (!st) | |
90 | return AVERROR(ENOMEM); | |
91 | if (memcmp(header, AMR_header, 6)) { | |
92 | avio_read(pb, header + 6, 3); | |
93 | if (memcmp(header, AMRWB_header, 9)) { | |
94 | return -1; | |
95 | } | |
96 | ||
97 | st->codec->codec_tag = MKTAG('s', 'a', 'w', 'b'); | |
98 | st->codec->codec_id = AV_CODEC_ID_AMR_WB; | |
99 | st->codec->sample_rate = 16000; | |
100 | } else { | |
101 | st->codec->codec_tag = MKTAG('s', 'a', 'm', 'r'); | |
102 | st->codec->codec_id = AV_CODEC_ID_AMR_NB; | |
103 | st->codec->sample_rate = 8000; | |
104 | } | |
105 | st->codec->channels = 1; | |
106 | st->codec->channel_layout = AV_CH_LAYOUT_MONO; | |
107 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
108 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); | |
109 | ||
110 | return 0; | |
111 | } | |
112 | ||
113 | static int amr_read_packet(AVFormatContext *s, AVPacket *pkt) | |
114 | { | |
115 | AVCodecContext *enc = s->streams[0]->codec; | |
116 | int read, size = 0, toc, mode; | |
117 | int64_t pos = avio_tell(s->pb); | |
118 | AMRContext *amr = s->priv_data; | |
119 | ||
120 | if (avio_feof(s->pb)) { | |
121 | return AVERROR(EIO); | |
122 | } | |
123 | ||
124 | // FIXME this is wrong, this should rather be in a AVParser | |
125 | toc = avio_r8(s->pb); | |
126 | mode = (toc >> 3) & 0x0F; | |
127 | ||
128 | if (enc->codec_id == AV_CODEC_ID_AMR_NB) { | |
129 | static const uint8_t packed_size[16] = { | |
130 | 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 | |
131 | }; | |
132 | ||
133 | size = packed_size[mode] + 1; | |
134 | } else if (enc->codec_id == AV_CODEC_ID_AMR_WB) { | |
135 | static const uint8_t packed_size[16] = { | |
136 | 18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1 | |
137 | }; | |
138 | ||
139 | size = packed_size[mode]; | |
140 | } | |
141 | ||
142 | if (!size || av_new_packet(pkt, size)) | |
143 | return AVERROR(EIO); | |
144 | ||
145 | if (amr->cumulated_size < UINT64_MAX - size) { | |
146 | amr->cumulated_size += size; | |
147 | /* Both AMR formats have 50 frames per second */ | |
148 | s->streams[0]->codec->bit_rate = amr->cumulated_size / ++amr->block_count * 8 * 50; | |
149 | } | |
150 | ||
151 | pkt->stream_index = 0; | |
152 | pkt->pos = pos; | |
153 | pkt->data[0] = toc; | |
154 | pkt->duration = enc->codec_id == AV_CODEC_ID_AMR_NB ? 160 : 320; | |
155 | read = avio_read(s->pb, pkt->data + 1, size - 1); | |
156 | ||
157 | if (read != size - 1) { | |
158 | av_free_packet(pkt); | |
159 | return AVERROR(EIO); | |
160 | } | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | #if CONFIG_AMR_DEMUXER | |
166 | AVInputFormat ff_amr_demuxer = { | |
167 | .name = "amr", | |
168 | .long_name = NULL_IF_CONFIG_SMALL("3GPP AMR"), | |
169 | .priv_data_size = sizeof(AMRContext), | |
170 | .read_probe = amr_probe, | |
171 | .read_header = amr_read_header, | |
172 | .read_packet = amr_read_packet, | |
173 | .flags = AVFMT_GENERIC_INDEX, | |
174 | }; | |
175 | #endif | |
176 | ||
177 | #if CONFIG_AMR_MUXER | |
178 | AVOutputFormat ff_amr_muxer = { | |
179 | .name = "amr", | |
180 | .long_name = NULL_IF_CONFIG_SMALL("3GPP AMR"), | |
181 | .mime_type = "audio/amr", | |
182 | .extensions = "amr", | |
183 | .audio_codec = AV_CODEC_ID_AMR_NB, | |
184 | .video_codec = AV_CODEC_ID_NONE, | |
185 | .write_header = amr_write_header, | |
186 | .write_packet = amr_write_packet, | |
187 | .flags = AVFMT_NOTIMESTAMPS, | |
188 | }; | |
189 | #endif |