3 * Copyright (c) 2001 ffmpeg project
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 Write and read amr data according to RFC3267, http://www.ietf.org/rfc/rfc3267.txt?number=3267
23 Only mono files are supported.
28 static const unsigned char AMR_header [] = "#!AMR\n";
29 static const unsigned char AMRWB_header [] = "#!AMR-WB\n";
31 static int amr_write_header(AVFormatContext *s)
33 ByteIOContext *pb = &s->pb;
34 AVCodecContext *enc = &s->streams[0]->codec;
38 if (enc->codec_id == CODEC_ID_AMR_NB)
40 put_tag(pb, AMR_header); /* magic number */
42 else if(enc->codec_id == CODEC_ID_AMR_WB)
44 put_tag(pb, AMRWB_header); /* magic number */
54 static int amr_write_packet(AVFormatContext *s, AVPacket *pkt)
56 put_buffer(&s->pb, pkt->data, pkt->size);
57 put_flush_packet(&s->pb);
61 static int amr_write_trailer(AVFormatContext *s)
66 static int amr_probe(AVProbeData *p)
68 //Only check for "#!AMR" which could be amr-wb, amr-nb.
69 //This will also trigger multichannel files: "#!AMR_MC1.0\n" and
70 //"#!AMR-WB_MC1.0\n" (not supported)
74 if(memcmp(p->buf,AMR_header,5)==0)
75 return AVPROBE_SCORE_MAX;
81 static int amr_read_header(AVFormatContext *s,
82 AVFormatParameters *ap)
84 ByteIOContext *pb = &s->pb;
88 get_buffer(pb, header, 6);
90 if(memcmp(header,AMR_header,6)!=0)
92 get_buffer(pb, header+6, 3);
93 if(memcmp(header,AMRWB_header,9)!=0)
97 st = av_new_stream(s, 0);
100 return AVERROR_NOMEM;
103 st->codec.codec_type = CODEC_TYPE_AUDIO;
104 st->codec.codec_tag = CODEC_ID_AMR_WB;
105 st->codec.codec_id = CODEC_ID_AMR_WB;
106 st->codec.channels = 1;
107 st->codec.sample_rate = 16000;
111 st = av_new_stream(s, 0);
114 return AVERROR_NOMEM;
117 st->codec.codec_type = CODEC_TYPE_AUDIO;
118 st->codec.codec_tag = CODEC_ID_AMR_NB;
119 st->codec.codec_id = CODEC_ID_AMR_NB;
120 st->codec.channels = 1;
121 st->codec.sample_rate = 8000;
129 static int amr_read_packet(AVFormatContext *s,
132 AVCodecContext *enc = &s->streams[0]->codec;
134 if (enc->codec_id == CODEC_ID_AMR_NB)
136 const static uint8_t packed_size[16] = {12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0};
141 if (url_feof(&s->pb))
146 toc=get_byte(&s->pb);
147 q = (toc >> 2) & 0x01;
148 ft = (toc >> 3) & 0x0F;
150 size=packed_size[ft];
152 if (av_new_packet(pkt, size+1))
156 pkt->stream_index = 0;
160 read = get_buffer(&s->pb, pkt->data+1, size);
170 else if(enc->codec_id == CODEC_ID_AMR_WB)
172 static uint8_t packed_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
177 if (url_feof(&s->pb))
182 toc=get_byte(&s->pb);
183 mode = (uint8_t)((toc >> 3) & 0x0F);
184 size = packed_size[mode];
186 if ( (size==0) || av_new_packet(pkt, size))
191 pkt->stream_index = 0;
194 read = get_buffer(&s->pb, pkt->data+1, size-1);
196 if (read != (size-1))
210 static int amr_read_close(AVFormatContext *s)
215 static AVInputFormat amr_iformat = {
217 "3gpp amr file format",
218 0, /*priv_data_size*/
225 static AVOutputFormat amr_oformat = {
227 "3gpp amr file format",
240 av_register_input_format(&amr_iformat);
241 av_register_output_format(&amr_oformat);