1 /*
2 *
3 * Bluetooth low-complexity, subband codec (SBC) encoder
4 *
5 * Copyright (C) 2004-2009 Marcel Holtmann <marcel@holtmann.org>
6 *
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 *
22 */
23
24 #ifdef HAVE_CONFIG_H
25 #include <config.h>
26 #endif
27
28 #include <stdio.h>
29 #include <errno.h>
30 #include <fcntl.h>
31 #include <unistd.h>
32 #include <stdlib.h>
33 #include <stdint.h>
34 #include <string.h>
35 #include <getopt.h>
36 #include <sys/stat.h>
37
38 #include "sbc.h"
39 #include "formats.h"
40
41 static int verbose = 0;
42
43 #define BUF_SIZE 32768
44 static unsigned char input[BUF_SIZE], output[BUF_SIZE + BUF_SIZE / 4];
45
encode(char * filename,int subbands,int bitpool,int joint,int dualchannel,int snr,int blocks)46 static void encode(char *filename, int subbands, int bitpool, int joint,
47 int dualchannel, int snr, int blocks)
48 {
49 struct au_header au_hdr;
50 sbc_t sbc;
51 int fd, size, srate, codesize, nframes;
52 size_t encoded;
53 ssize_t len;
54
55 if (sizeof(au_hdr) != 24) {
56 /* Sanity check just in case */
57 fprintf(stderr, "FIXME: sizeof(au_hdr) != 24\n");
58 return;
59 }
60
61 if (strcmp(filename, "-")) {
62 fd = open(filename, O_RDONLY);
63 if (fd < 0) {
64 fprintf(stderr, "Can't open file %s: %s\n",
65 filename, strerror(errno));
66 return;
67 }
68 } else
69 fd = fileno(stdin);
70
71 len = read(fd, &au_hdr, sizeof(au_hdr));
72 if (len < (ssize_t) sizeof(au_hdr)) {
73 if (fd > fileno(stderr))
74 fprintf(stderr, "Can't read header from file %s: %s\n",
75 filename, strerror(errno));
76 else
77 perror("Can't read audio header");
78 goto done;
79 }
80
81 if (au_hdr.magic != AU_MAGIC ||
82 BE_INT(au_hdr.hdr_size) > 128 ||
83 BE_INT(au_hdr.hdr_size) < sizeof(au_hdr) ||
84 BE_INT(au_hdr.encoding) != AU_FMT_LIN16) {
85 fprintf(stderr, "Not in Sun/NeXT audio S16_BE format\n");
86 goto done;
87 }
88
89 sbc_init(&sbc, 0L);
90
91 switch (BE_INT(au_hdr.sample_rate)) {
92 case 16000:
93 sbc.frequency = SBC_FREQ_16000;
94 break;
95 case 32000:
96 sbc.frequency = SBC_FREQ_32000;
97 break;
98 case 44100:
99 sbc.frequency = SBC_FREQ_44100;
100 break;
101 case 48000:
102 sbc.frequency = SBC_FREQ_48000;
103 break;
104 }
105
106 srate = BE_INT(au_hdr.sample_rate);
107
108 sbc.subbands = subbands == 4 ? SBC_SB_4 : SBC_SB_8;
109
110 if (BE_INT(au_hdr.channels) == 1) {
111 sbc.mode = SBC_MODE_MONO;
112 if (joint || dualchannel) {
113 fprintf(stderr, "Audio is mono but joint or "
114 "dualchannel mode has been specified\n");
115 goto done;
116 }
117 } else if (joint && !dualchannel)
118 sbc.mode = SBC_MODE_JOINT_STEREO;
119 else if (!joint && dualchannel)
120 sbc.mode = SBC_MODE_DUAL_CHANNEL;
121 else if (!joint && !dualchannel)
122 sbc.mode = SBC_MODE_STEREO;
123 else {
124 fprintf(stderr, "Both joint and dualchannel mode have been "
125 "specified\n");
126 goto done;
127 }
128
129 sbc.endian = SBC_BE;
130 /* Skip extra bytes of the header if any */
131 if (read(fd, input, BE_INT(au_hdr.hdr_size) - len) < 0)
132 goto done;
133
134 sbc.bitpool = bitpool;
135 sbc.allocation = snr ? SBC_AM_SNR : SBC_AM_LOUDNESS;
136 sbc.blocks = blocks == 4 ? SBC_BLK_4 :
137 blocks == 8 ? SBC_BLK_8 :
138 blocks == 12 ? SBC_BLK_12 : SBC_BLK_16;
139
140 if (verbose) {
141 fprintf(stderr, "encoding %s with rate %d, %d blocks, "
142 "%d subbands, %d bits, allocation method %s, "
143 "and mode %s\n",
144 filename, srate, blocks, subbands, bitpool,
145 sbc.allocation == SBC_AM_SNR ? "SNR" : "LOUDNESS",
146 sbc.mode == SBC_MODE_MONO ? "MONO" :
147 sbc.mode == SBC_MODE_STEREO ?
148 "STEREO" : "JOINTSTEREO");
149 }
150
151 codesize = sbc_get_codesize(&sbc);
152 nframes = sizeof(input) / codesize;
153 while (1) {
154 unsigned char *inp, *outp;
155 /* read data for up to 'nframes' frames of input data */
156 size = read(fd, input, codesize * nframes);
157 if (size < 0) {
158 /* Something really bad happened */
159 perror("Can't read audio data");
160 break;
161 }
162 if (size < codesize) {
163 /* Not enough data for encoding even a single frame */
164 break;
165 }
166 /* encode all the data from the input buffer in a loop */
167 inp = input;
168 outp = output;
169 while (size >= codesize) {
170 len = sbc_encode(&sbc, inp, codesize,
171 outp, sizeof(output) - (outp - output),
172 &encoded);
173 if (len != codesize || encoded <= 0) {
174 fprintf(stderr,
175 "sbc_encode fail, len=%zd, encoded=%lu\n",
176 len, (unsigned long) encoded);
177 break;
178 }
179 size -= len;
180 inp += len;
181 outp += encoded;
182 }
183 len = write(fileno(stdout), output, outp - output);
184 if (len != outp - output) {
185 perror("Can't write SBC output");
186 break;
187 }
188 if (size != 0) {
189 /*
190 * sbc_encode failure has been detected earlier or end
191 * of file reached (have trailing partial data which is
192 * insufficient to encode SBC frame)
193 */
194 break;
195 }
196 }
197
198 sbc_finish(&sbc);
199
200 done:
201 if (fd > fileno(stderr))
202 close(fd);
203 }
204
usage(void)205 static void usage(void)
206 {
207 printf("SBC encoder utility ver %s\n", VERSION);
208 printf("Copyright (c) 2004-2009 Marcel Holtmann\n\n");
209
210 printf("Usage:\n"
211 "\tsbcenc [options] file(s)\n"
212 "\n");
213
214 printf("Options:\n"
215 "\t-h, --help Display help\n"
216 "\t-v, --verbose Verbose mode\n"
217 "\t-s, --subbands Number of subbands to use (4 or 8)\n"
218 "\t-b, --bitpool Bitpool value (default is 32)\n"
219 "\t-j, --joint Joint stereo\n"
220 "\t-d, --dualchannel Dual channel\n"
221 "\t-S, --snr Use SNR mode (default is loudness)\n"
222 "\t-B, --blocks Number of blocks (4, 8, 12 or 16)\n"
223 "\n");
224 }
225
226 static struct option main_options[] = {
227 { "help", 0, 0, 'h' },
228 { "verbose", 0, 0, 'v' },
229 { "subbands", 1, 0, 's' },
230 { "bitpool", 1, 0, 'b' },
231 { "joint", 0, 0, 'j' },
232 { "dualchannel",0, 0, 'd' },
233 { "snr", 0, 0, 'S' },
234 { "blocks", 1, 0, 'B' },
235 { 0, 0, 0, 0 }
236 };
237
main(int argc,char * argv[])238 int main(int argc, char *argv[])
239 {
240 int i, opt, subbands = 8, bitpool = 32, joint = 0, dualchannel = 0;
241 int snr = 0, blocks = 16;
242
243 while ((opt = getopt_long(argc, argv, "+hvs:b:jdSB:",
244 main_options, NULL)) != -1) {
245 switch(opt) {
246 case 'h':
247 usage();
248 exit(0);
249
250 case 'v':
251 verbose = 1;
252 break;
253
254 case 's':
255 subbands = atoi(optarg);
256 if (subbands != 8 && subbands != 4) {
257 fprintf(stderr, "Invalid subbands\n");
258 exit(1);
259 }
260 break;
261
262 case 'b':
263 bitpool = atoi(optarg);
264 break;
265
266 case 'j':
267 joint = 1;
268 break;
269
270 case 'd':
271 dualchannel = 1;
272 break;
273
274 case 'S':
275 snr = 1;
276 break;
277
278 case 'B':
279 blocks = atoi(optarg);
280 if (blocks != 16 && blocks != 12 &&
281 blocks != 8 && blocks != 4) {
282 fprintf(stderr, "Invalid blocks\n");
283 exit(1);
284 }
285 break;
286
287 default:
288 usage();
289 exit(1);
290 }
291 }
292
293 argc -= optind;
294 argv += optind;
295 optind = 0;
296
297 if (argc < 1) {
298 usage();
299 exit(1);
300 }
301
302 for (i = 0; i < argc; i++)
303 encode(argv[i], subbands, bitpool, joint, dualchannel,
304 snr, blocks);
305
306 return 0;
307 }
308