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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 char AMR_header [] = "#!AMR\n";
29 static const char AMRWB_header [] = "#!AMR-WB\n";
32 static int amr_write_header(AVFormatContext *s)
34 ByteIOContext *pb = &s->pb;
35 AVCodecContext *enc = s->streams[0]->codec;
39 if (enc->codec_id == CODEC_ID_AMR_NB)
41 put_tag(pb, AMR_header); /* magic number */
43 else if(enc->codec_id == CODEC_ID_AMR_WB)
45 put_tag(pb, AMRWB_header); /* magic number */
55 static int amr_write_packet(AVFormatContext *s, AVPacket *pkt)
57 put_buffer(&s->pb, pkt->data, pkt->size);
58 put_flush_packet(&s->pb);
62 static int amr_write_trailer(AVFormatContext *s)
66 #endif /* CONFIG_MUXERS */
68 static int amr_probe(AVProbeData *p)
70 //Only check for "#!AMR" which could be amr-wb, amr-nb.
71 //This will also trigger multichannel files: "#!AMR_MC1.0\n" and
72 //"#!AMR-WB_MC1.0\n" (not supported)
76 if(memcmp(p->buf,AMR_header,5)==0)
77 return AVPROBE_SCORE_MAX;
83 static int amr_read_header(AVFormatContext *s,
84 AVFormatParameters *ap)
86 ByteIOContext *pb = &s->pb;
90 get_buffer(pb, header, 6);
92 if(memcmp(header,AMR_header,6)!=0)
94 get_buffer(pb, header+6, 3);
95 if(memcmp(header,AMRWB_header,9)!=0)
99 st = av_new_stream(s, 0);
102 return AVERROR_NOMEM;
105 st->codec->codec_type = CODEC_TYPE_AUDIO;
106 st->codec->codec_tag = MKTAG('s', 'a', 'w', 'b');
107 st->codec->codec_id = CODEC_ID_AMR_WB;
108 st->codec->channels = 1;
109 st->codec->sample_rate = 16000;
113 st = av_new_stream(s, 0);
116 return AVERROR_NOMEM;
119 st->codec->codec_type = CODEC_TYPE_AUDIO;
120 st->codec->codec_tag = MKTAG('s', 'a', 'm', 'r');
121 st->codec->codec_id = CODEC_ID_AMR_NB;
122 st->codec->channels = 1;
123 st->codec->sample_rate = 8000;
131 static int amr_read_packet(AVFormatContext *s,
134 AVCodecContext *enc = s->streams[0]->codec;
136 if (enc->codec_id == CODEC_ID_AMR_NB)
138 static const uint8_t packed_size[16] = {12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0};
143 if (url_feof(&s->pb))
148 toc=get_byte(&s->pb);
149 q = (toc >> 2) & 0x01;
150 ft = (toc >> 3) & 0x0F;
152 size=packed_size[ft];
154 if (av_new_packet(pkt, size+1))
158 pkt->stream_index = 0;
159 pkt->pos= url_ftell(&s->pb);
162 read = get_buffer(&s->pb, pkt->data+1, size);
172 else if(enc->codec_id == CODEC_ID_AMR_WB)
174 static uint8_t packed_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
179 if (url_feof(&s->pb))
184 toc=get_byte(&s->pb);
185 mode = (uint8_t)((toc >> 3) & 0x0F);
186 size = packed_size[mode];
188 if ( (size==0) || av_new_packet(pkt, size))
193 pkt->stream_index = 0;
194 pkt->pos= url_ftell(&s->pb);
197 read = get_buffer(&s->pb, pkt->data+1, size-1);
199 if (read != (size-1))
213 static int amr_read_close(AVFormatContext *s)
218 #ifdef CONFIG_AMR_DEMUXER
219 AVInputFormat amr_demuxer = {
221 "3gpp amr file format",
222 0, /*priv_data_size*/
230 #ifdef CONFIG_AMR_MUXER
231 AVOutputFormat amr_muxer = {
233 "3gpp amr file format",