3 * Copyright (c) 2001 ffmpeg project
5 * This file is part of FFmpeg.
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.
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.
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
23 Write and read amr data according to RFC3267, http://www.ietf.org/rfc/rfc3267.txt?number=3267
25 Only mono files are supported.
30 static const char AMR_header [] = "#!AMR\n";
31 static const char AMRWB_header [] = "#!AMR-WB\n";
34 static int amr_write_header(AVFormatContext *s)
36 ByteIOContext *pb = &s->pb;
37 AVCodecContext *enc = s->streams[0]->codec;
41 if (enc->codec_id == CODEC_ID_AMR_NB)
43 put_tag(pb, AMR_header); /* magic number */
45 else if(enc->codec_id == CODEC_ID_AMR_WB)
47 put_tag(pb, AMRWB_header); /* magic number */
57 static int amr_write_packet(AVFormatContext *s, AVPacket *pkt)
59 put_buffer(&s->pb, pkt->data, pkt->size);
60 put_flush_packet(&s->pb);
64 static int amr_write_trailer(AVFormatContext *s)
68 #endif /* CONFIG_MUXERS */
70 static int amr_probe(AVProbeData *p)
72 //Only check for "#!AMR" which could be amr-wb, amr-nb.
73 //This will also trigger multichannel files: "#!AMR_MC1.0\n" and
74 //"#!AMR-WB_MC1.0\n" (not supported)
78 if(memcmp(p->buf,AMR_header,5)==0)
79 return AVPROBE_SCORE_MAX;
85 static int amr_read_header(AVFormatContext *s,
86 AVFormatParameters *ap)
88 ByteIOContext *pb = &s->pb;
92 get_buffer(pb, header, 6);
94 st = av_new_stream(s, 0);
99 if(memcmp(header,AMR_header,6)!=0)
101 get_buffer(pb, header+6, 3);
102 if(memcmp(header,AMRWB_header,9)!=0)
107 st->codec->codec_tag = MKTAG('s', 'a', 'w', 'b');
108 st->codec->codec_id = CODEC_ID_AMR_WB;
109 st->codec->sample_rate = 16000;
113 st->codec->codec_tag = MKTAG('s', 'a', 'm', 'r');
114 st->codec->codec_id = CODEC_ID_AMR_NB;
115 st->codec->sample_rate = 8000;
117 st->codec->channels = 1;
118 st->codec->codec_type = CODEC_TYPE_AUDIO;
119 av_set_pts_info(st, 64, 1, st->codec->sample_rate);
124 static int amr_read_packet(AVFormatContext *s,
127 AVCodecContext *enc = s->streams[0]->codec;
128 int read, size, toc, mode;
130 if (url_feof(&s->pb))
135 //FIXME this is wrong, this should rather be in a AVParset
136 toc=get_byte(&s->pb);
137 mode = (toc >> 3) & 0x0F;
139 if (enc->codec_id == CODEC_ID_AMR_NB)
141 static const uint8_t packed_size[16] = {12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0};
143 size=packed_size[mode]+1;
145 else if(enc->codec_id == CODEC_ID_AMR_WB)
147 static uint8_t packed_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
149 size=packed_size[mode];
156 if ( (size==0) || av_new_packet(pkt, size))
161 pkt->stream_index = 0;
162 pkt->pos= url_ftell(&s->pb);
164 pkt->duration= enc->codec_id == CODEC_ID_AMR_NB ? 160 : 320;
165 read = get_buffer(&s->pb, pkt->data+1, size-1);
176 #ifdef CONFIG_AMR_DEMUXER
177 AVInputFormat amr_demuxer = {
179 "3gpp amr file format",
180 0, /*priv_data_size*/
188 #ifdef CONFIG_AMR_MUXER
189 AVOutputFormat amr_muxer = {
191 "3gpp amr file format",