sbcenc.c revision 5592142cb9383df0556b27ac59e96547b380310b 
1/*
2 *
3 *  Bluetooth low-complexity, subband codec (SBC) encoder
4 *
5 *  Copyright (C) 2008-2010  Nokia Corporation
6 *  Copyright (C) 2004-2010  Marcel Holtmann <marcel@holtmann.org>
7 *
8 *
9 *  This program is free software; you can redistribute it and/or modify
10 *  it under the terms of the GNU General Public License as published by
11 *  the Free Software Foundation; either version 2 of the License, or
12 *  (at your option) any later version.
13 *
14 *  This program is distributed in the hope that it will be useful,
15 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
16 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17 *  GNU General Public License for more details.
18 *
19 *  You should have received a copy of the GNU General Public License
20 *  along with this program; if not, write to the Free Software
21 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
22 *
23 */
24
25#ifdef HAVE_CONFIG_H
26#include <config.h>
27#endif
28
29#include <stdio.h>
30#include <errno.h>
31#include <fcntl.h>
32#include <unistd.h>
33#include <stdlib.h>
34#include <stdint.h>
35#include <string.h>
36#include <getopt.h>
37#include <sys/stat.h>
38
39#include "sbc.h"
40#include "formats.h"
41
42static int verbose = 0;
43
44#define BUF_SIZE 32768
45static unsigned char input[BUF_SIZE], output[BUF_SIZE + BUF_SIZE / 4];
46
47static void encode(char *filename, int subbands, int bitpool, int joint,
48					int dualchannel, int snr, int blocks)
49{
50	struct au_header au_hdr;
51	sbc_t sbc;
52	int fd, size, srate, codesize, nframes;
53	size_t encoded;
54	ssize_t len;
55
56	if (sizeof(au_hdr) != 24) {
57		/* Sanity check just in case */
58		fprintf(stderr, "FIXME: sizeof(au_hdr) != 24\n");
59		return;
60	}
61
62	if (strcmp(filename, "-")) {
63		fd = open(filename, O_RDONLY);
64		if (fd < 0) {
65			fprintf(stderr, "Can't open file %s: %s\n",
66						filename, strerror(errno));
67			return;
68		}
69	} else
70		fd = fileno(stdin);
71
72	len = read(fd, &au_hdr, sizeof(au_hdr));
73	if (len < (ssize_t) sizeof(au_hdr)) {
74		if (fd > fileno(stderr))
75			fprintf(stderr, "Can't read header from file %s: %s\n",
76						filename, strerror(errno));
77		else
78			perror("Can't read audio header");
79		goto done;
80	}
81
82	if (au_hdr.magic != AU_MAGIC ||
83			BE_INT(au_hdr.hdr_size) > 128 ||
84			BE_INT(au_hdr.hdr_size) < sizeof(au_hdr) ||
85			BE_INT(au_hdr.encoding) != AU_FMT_LIN16) {
86		fprintf(stderr, "Not in Sun/NeXT audio S16_BE format\n");
87		goto done;
88	}
89
90	sbc_init(&sbc, 0L);
91
92	switch (BE_INT(au_hdr.sample_rate)) {
93	case 16000:
94		sbc.frequency = SBC_FREQ_16000;
95		break;
96	case 32000:
97		sbc.frequency = SBC_FREQ_32000;
98		break;
99	case 44100:
100		sbc.frequency = SBC_FREQ_44100;
101		break;
102	case 48000:
103		sbc.frequency = SBC_FREQ_48000;
104		break;
105	}
106
107	srate = BE_INT(au_hdr.sample_rate);
108
109	sbc.subbands = subbands == 4 ? SBC_SB_4 : SBC_SB_8;
110
111	if (BE_INT(au_hdr.channels) == 1) {
112		sbc.mode = SBC_MODE_MONO;
113		if (joint || dualchannel) {
114			fprintf(stderr, "Audio is mono but joint or "
115				"dualchannel mode has been specified\n");
116			goto done;
117		}
118	} else if (joint && !dualchannel)
119		sbc.mode = SBC_MODE_JOINT_STEREO;
120	else if (!joint && dualchannel)
121		sbc.mode = SBC_MODE_DUAL_CHANNEL;
122	else if (!joint && !dualchannel)
123		sbc.mode = SBC_MODE_STEREO;
124	else {
125		fprintf(stderr, "Both joint and dualchannel mode have been "
126								"specified\n");
127		goto done;
128	}
129
130	sbc.endian = SBC_BE;
131	/* Skip extra bytes of the header if any */
132	if (read(fd, input, BE_INT(au_hdr.hdr_size) - len) < 0)
133		goto done;
134
135	sbc.bitpool = bitpool;
136	sbc.allocation = snr ? SBC_AM_SNR : SBC_AM_LOUDNESS;
137	sbc.blocks = blocks == 4 ? SBC_BLK_4 :
138			blocks == 8 ? SBC_BLK_8 :
139				blocks == 12 ? SBC_BLK_12 : SBC_BLK_16;
140
141	if (verbose) {
142		fprintf(stderr, "encoding %s with rate %d, %d blocks, "
143			"%d subbands, %d bits, allocation method %s, "
144							"and mode %s\n",
145			filename, srate, blocks, subbands, bitpool,
146			sbc.allocation == SBC_AM_SNR ? "SNR" : "LOUDNESS",
147			sbc.mode == SBC_MODE_MONO ? "MONO" :
148					sbc.mode == SBC_MODE_STEREO ?
149						"STEREO" : "JOINTSTEREO");
150	}
151
152	codesize = sbc_get_codesize(&sbc);
153	nframes = sizeof(input) / codesize;
154	while (1) {
155		unsigned char *inp, *outp;
156		/* read data for up to 'nframes' frames of input data */
157		size = read(fd, input, codesize * nframes);
158		if (size < 0) {
159			/* Something really bad happened */
160			perror("Can't read audio data");
161			break;
162		}
163		if (size < codesize) {
164			/* Not enough data for encoding even a single frame */
165			break;
166		}
167		/* encode all the data from the input buffer in a loop */
168		inp = input;
169		outp = output;
170		while (size >= codesize) {
171			len = sbc_encode(&sbc, inp, codesize,
172				outp, sizeof(output) - (outp - output),
173				&encoded);
174			if (len != codesize || encoded <= 0) {
175				fprintf(stderr,
176					"sbc_encode fail, len=%zd, encoded=%lu\n",
177					len, (unsigned long) encoded);
178				break;
179			}
180			size -= len;
181			inp += len;
182			outp += encoded;
183		}
184		len = write(fileno(stdout), output, outp - output);
185		if (len != outp - output) {
186			perror("Can't write SBC output");
187			break;
188		}
189		if (size != 0) {
190			/*
191			 * sbc_encode failure has been detected earlier or end
192			 * of file reached (have trailing partial data which is
193			 * insufficient to encode SBC frame)
194			 */
195			break;
196		}
197	}
198
199	sbc_finish(&sbc);
200
201done:
202	if (fd > fileno(stderr))
203		close(fd);
204}
205
206static void usage(void)
207{
208	printf("SBC encoder utility ver %s\n", VERSION);
209	printf("Copyright (c) 2004-2010  Marcel Holtmann\n\n");
210
211	printf("Usage:\n"
212		"\tsbcenc [options] file(s)\n"
213		"\n");
214
215	printf("Options:\n"
216		"\t-h, --help           Display help\n"
217		"\t-v, --verbose        Verbose mode\n"
218		"\t-s, --subbands       Number of subbands to use (4 or 8)\n"
219		"\t-b, --bitpool        Bitpool value (default is 32)\n"
220		"\t-j, --joint          Joint stereo\n"
221		"\t-d, --dualchannel    Dual channel\n"
222		"\t-S, --snr            Use SNR mode (default is loudness)\n"
223		"\t-B, --blocks         Number of blocks (4, 8, 12 or 16)\n"
224		"\n");
225}
226
227static struct option main_options[] = {
228	{ "help",	0, 0, 'h' },
229	{ "verbose",	0, 0, 'v' },
230	{ "subbands",	1, 0, 's' },
231	{ "bitpool",	1, 0, 'b' },
232	{ "joint",	0, 0, 'j' },
233	{ "dualchannel",0, 0, 'd' },
234	{ "snr",	0, 0, 'S' },
235	{ "blocks",	1, 0, 'B' },
236	{ 0, 0, 0, 0 }
237};
238
239int main(int argc, char *argv[])
240{
241	int i, opt, subbands = 8, bitpool = 32, joint = 0, dualchannel = 0;
242	int snr = 0, blocks = 16;
243
244	while ((opt = getopt_long(argc, argv, "+hvs:b:jdSB:",
245						main_options, NULL)) != -1) {
246		switch(opt) {
247		case 'h':
248			usage();
249			exit(0);
250
251		case 'v':
252			verbose = 1;
253			break;
254
255		case 's':
256			subbands = atoi(optarg);
257			if (subbands != 8 && subbands != 4) {
258				fprintf(stderr, "Invalid subbands\n");
259				exit(1);
260			}
261			break;
262
263		case 'b':
264			bitpool = atoi(optarg);
265			break;
266
267		case 'j':
268			joint = 1;
269			break;
270
271		case 'd':
272			dualchannel = 1;
273			break;
274
275		case 'S':
276			snr = 1;
277			break;
278
279		case 'B':
280			blocks = atoi(optarg);
281			if (blocks != 16 && blocks != 12 &&
282						blocks != 8 && blocks != 4) {
283				fprintf(stderr, "Invalid blocks\n");
284				exit(1);
285			}
286			break;
287
288		default:
289			usage();
290			exit(1);
291		}
292	}
293
294	argc -= optind;
295	argv += optind;
296	optind = 0;
297
298	if (argc < 1) {
299		usage();
300		exit(1);
301	}
302
303	for (i = 0; i < argc; i++)
304		encode(argv[i], subbands, bitpool, joint, dualchannel,
305								snr, blocks);
306
307	return 0;
308}
309