changing AVCodecContext codec -> *codec in AVStream so additions to AVCodecContext...
[libav.git] / libavformat / amr.c
1 /*
2 * amr file format
3 * Copyright (c) 2001 ffmpeg project
4 *
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.
9 *
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.
14 *
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
18 */
19
20 /*
21 Write and read amr data according to RFC3267, http://www.ietf.org/rfc/rfc3267.txt?number=3267
22
23 Only mono files are supported.
24
25 */
26 #include "avformat.h"
27
28 static const unsigned char AMR_header [] = "#!AMR\n";
29 static const unsigned char AMRWB_header [] = "#!AMR-WB\n";
30
31 static int amr_write_header(AVFormatContext *s)
32 {
33 ByteIOContext *pb = &s->pb;
34 AVCodecContext *enc = s->streams[0]->codec;
35
36 s->priv_data = NULL;
37
38 if (enc->codec_id == CODEC_ID_AMR_NB)
39 {
40 put_tag(pb, AMR_header); /* magic number */
41 }
42 else if(enc->codec_id == CODEC_ID_AMR_WB)
43 {
44 put_tag(pb, AMRWB_header); /* magic number */
45 }
46 else
47 {
48 //This is an error!
49 }
50 put_flush_packet(pb);
51 return 0;
52 }
53
54 static int amr_write_packet(AVFormatContext *s, AVPacket *pkt)
55 {
56 put_buffer(&s->pb, pkt->data, pkt->size);
57 put_flush_packet(&s->pb);
58 return 0;
59 }
60
61 static int amr_write_trailer(AVFormatContext *s)
62 {
63 return 0;
64 }
65
66 static int amr_probe(AVProbeData *p)
67 {
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)
71
72 if (p->buf_size < 5)
73 return 0;
74 if(memcmp(p->buf,AMR_header,5)==0)
75 return AVPROBE_SCORE_MAX;
76 else
77 return 0;
78 }
79
80 /* amr input */
81 static int amr_read_header(AVFormatContext *s,
82 AVFormatParameters *ap)
83 {
84 ByteIOContext *pb = &s->pb;
85 AVStream *st;
86 uint8_t header[9];
87
88 get_buffer(pb, header, 6);
89
90 if(memcmp(header,AMR_header,6)!=0)
91 {
92 get_buffer(pb, header+6, 3);
93 if(memcmp(header,AMRWB_header,9)!=0)
94 {
95 return -1;
96 }
97 st = av_new_stream(s, 0);
98 if (!st)
99 {
100 return AVERROR_NOMEM;
101 }
102
103 st->codec->codec_type = CODEC_TYPE_AUDIO;
104 st->codec->codec_tag = MKTAG('s', 'a', 'w', 'b');
105 st->codec->codec_id = CODEC_ID_AMR_WB;
106 st->codec->channels = 1;
107 st->codec->sample_rate = 16000;
108 }
109 else
110 {
111 st = av_new_stream(s, 0);
112 if (!st)
113 {
114 return AVERROR_NOMEM;
115 }
116
117 st->codec->codec_type = CODEC_TYPE_AUDIO;
118 st->codec->codec_tag = MKTAG('s', 'a', 'm', 'r');
119 st->codec->codec_id = CODEC_ID_AMR_NB;
120 st->codec->channels = 1;
121 st->codec->sample_rate = 8000;
122 }
123
124 return 0;
125 }
126
127 #define MAX_SIZE 32
128
129 static int amr_read_packet(AVFormatContext *s,
130 AVPacket *pkt)
131 {
132 AVCodecContext *enc = s->streams[0]->codec;
133
134 if (enc->codec_id == CODEC_ID_AMR_NB)
135 {
136 const static uint8_t packed_size[16] = {12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0};
137 uint8_t toc, q, ft;
138 int read;
139 int size;
140
141 if (url_feof(&s->pb))
142 {
143 return AVERROR_IO;
144 }
145
146 toc=get_byte(&s->pb);
147 q = (toc >> 2) & 0x01;
148 ft = (toc >> 3) & 0x0F;
149
150 size=packed_size[ft];
151
152 if (av_new_packet(pkt, size+1))
153 {
154 return AVERROR_IO;
155 }
156 pkt->stream_index = 0;
157 pkt->pos= url_ftell(&s->pb);
158 pkt->data[0]=toc;
159
160 read = get_buffer(&s->pb, pkt->data+1, size);
161
162 if (read != size)
163 {
164 av_free_packet(pkt);
165 return AVERROR_IO;
166 }
167
168 return 0;
169 }
170 else if(enc->codec_id == CODEC_ID_AMR_WB)
171 {
172 static uint8_t packed_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
173 uint8_t toc, mode;
174 int read;
175 int size;
176
177 if (url_feof(&s->pb))
178 {
179 return AVERROR_IO;
180 }
181
182 toc=get_byte(&s->pb);
183 mode = (uint8_t)((toc >> 3) & 0x0F);
184 size = packed_size[mode];
185
186 if ( (size==0) || av_new_packet(pkt, size))
187 {
188 return AVERROR_IO;
189 }
190
191 pkt->stream_index = 0;
192 pkt->pos= url_ftell(&s->pb);
193 pkt->data[0]=toc;
194
195 read = get_buffer(&s->pb, pkt->data+1, size-1);
196
197 if (read != (size-1))
198 {
199 av_free_packet(pkt);
200 return AVERROR_IO;
201 }
202
203 return 0;
204 }
205 else
206 {
207 return AVERROR_IO;
208 }
209 }
210
211 static int amr_read_close(AVFormatContext *s)
212 {
213 return 0;
214 }
215
216 static AVInputFormat amr_iformat = {
217 "amr",
218 "3gpp amr file format",
219 0, /*priv_data_size*/
220 amr_probe,
221 amr_read_header,
222 amr_read_packet,
223 amr_read_close,
224 };
225
226 static AVOutputFormat amr_oformat = {
227 "amr",
228 "3gpp amr file format",
229 "audio/amr",
230 "amr",
231 0,
232 CODEC_ID_AMR_NB,
233 CODEC_ID_NONE,
234 amr_write_header,
235 amr_write_packet,
236 amr_write_trailer,
237 };
238
239 int amr_init(void)
240 {
241 av_register_input_format(&amr_iformat);
242 av_register_output_format(&amr_oformat);
243 return 0;
244 }