1 /******************************************************************************
2 *
3 * Copyright 2022 Google LLC
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 ******************************************************************************/
18
19 #define _POSIX_C_SOURCE 199309L
20
21 #include <stdalign.h>
22 #include <stdio.h>
23 #include <stdarg.h>
24 #include <stdlib.h>
25 #include <string.h>
26 #include <math.h>
27 #include <time.h>
28 #include <errno.h>
29
30 #include <lc3.h>
31 #include "lc3bin.h"
32 #include "wave.h"
33
34
35 /**
36 * Error handling
37 */
38
error(int status,const char * format,...)39 static void error(int status, const char *format, ...)
40 {
41 va_list args;
42
43 fflush(stdout);
44
45 va_start(args, format);
46 vfprintf(stderr, format, args);
47 va_end(args);
48
49 fprintf(stderr, status ? ": %s\n" : "\n", strerror(status));
50 exit(status);
51 }
52
53
54 /**
55 * Parameters
56 */
57
58 struct parameters {
59 const char *fname_in;
60 const char *fname_out;
61 float frame_ms;
62 int srate_hz;
63 int bitrate;
64 };
65
parse_args(int argc,char * argv[])66 static struct parameters parse_args(int argc, char *argv[])
67 {
68 static const char *usage =
69 "Usage: %s [options] [wav_file] [out_file]\n"
70 "\n"
71 "wav_file\t" "Input wave file, stdin if omitted\n"
72 "out_file\t" "Output bitstream file, stdout if omitted\n"
73 "\n"
74 "Options:\n"
75 "\t-h\t" "Display help\n"
76 "\t-b\t" "Bitrate in bps (mandatory)\n"
77 "\t-m\t" "Frame duration in ms (default 10)\n"
78 "\t-r\t" "Encoder samplerate (default is input samplerate)\n"
79 "\n";
80
81 struct parameters p = { .frame_ms = 10 };
82
83 for (int iarg = 1; iarg < argc; ) {
84 const char *arg = argv[iarg++];
85
86 if (arg[0] == '-') {
87 if (arg[2] != '\0')
88 error(EINVAL, "Option %s", arg);
89
90 char opt = arg[1];
91 const char *optarg = NULL;
92
93 switch (opt) {
94 case 'b': case 'm': case 'r':
95 if (iarg >= argc)
96 error(EINVAL, "Argument %s", arg);
97 optarg = argv[iarg++];
98 }
99
100 switch (opt) {
101 case 'h': fprintf(stderr, usage, argv[0]); exit(0);
102 case 'b': p.bitrate = atoi(optarg); break;
103 case 'm': p.frame_ms = atof(optarg); break;
104 case 'r': p.srate_hz = atoi(optarg); break;
105 default:
106 error(EINVAL, "Option %s", arg);
107 }
108
109 } else {
110
111 if (!p.fname_in)
112 p.fname_in = arg;
113 else if (!p.fname_out)
114 p.fname_out = arg;
115 else
116 error(EINVAL, "Argument %s", arg);
117 }
118 }
119
120 return p;
121 }
122
123
124 /**
125 * Return time in (us) from unspecified point in the past
126 */
127
clock_us(void)128 static unsigned clock_us(void)
129 {
130 struct timespec ts;
131
132 clock_gettime(CLOCK_MONOTONIC, &ts);
133
134 return (unsigned)(ts.tv_sec * 1000*1000) + (unsigned)(ts.tv_nsec / 1000);
135 }
136
137
138 /**
139 * Entry point
140 */
141
main(int argc,char * argv[])142 int main(int argc, char *argv[])
143 {
144 /* --- Read parameters --- */
145
146 struct parameters p = parse_args(argc, argv);
147 FILE *fp_in = stdin, *fp_out = stdout;
148
149 if (p.fname_in && (fp_in = fopen(p.fname_in, "rb")) == NULL)
150 error(errno, "%s", p.fname_in);
151
152 if (p.fname_out && (fp_out = fopen(p.fname_out, "wb")) == NULL)
153 error(errno, "%s", p.fname_out);
154
155 if (p.srate_hz && !LC3_CHECK_SR_HZ(p.srate_hz))
156 error(EINVAL, "Samplerate %d Hz", p.srate_hz);
157
158 /* --- Check parameters --- */
159
160 int frame_us = p.frame_ms * 1000;
161 int srate_hz, nch, nsamples;
162 int pcm_sbits, pcm_sbytes;
163
164 if (wave_read_header(fp_in,
165 &pcm_sbits, &pcm_sbytes, &srate_hz, &nch, &nsamples) < 0)
166 error(EINVAL, "Bad or unsupported WAVE input file");
167
168 if (p.bitrate <= 0)
169 error(EINVAL, "Bitrate");
170
171 if (!LC3_CHECK_DT_US(frame_us))
172 error(EINVAL, "Frame duration");
173
174 if (!LC3_CHECK_SR_HZ(srate_hz) || (p.srate_hz && p.srate_hz > srate_hz))
175 error(EINVAL, "Samplerate %d Hz", srate_hz);
176
177 if (pcm_sbits != 16 && pcm_sbits != 24)
178 error(EINVAL, "Bitdepth %d", pcm_sbits);
179
180 if ((pcm_sbits == 16 && pcm_sbytes != 16/8) ||
181 (pcm_sbits == 24 && pcm_sbytes != 24/8 && pcm_sbytes != 32/8))
182 error(EINVAL, "Sample storage on %d bytes", pcm_sbytes);
183
184 if (nch < 1 || nch > 2)
185 error(EINVAL, "Number of channels %d", nch);
186
187 int enc_srate_hz = !p.srate_hz ? srate_hz : p.srate_hz;
188 int enc_samples = !p.srate_hz ? nsamples :
189 ((int64_t)nsamples * enc_srate_hz) / srate_hz;
190
191 lc3bin_write_header(fp_out,
192 frame_us, enc_srate_hz, p.bitrate, nch, enc_samples);
193
194 /* --- Setup encoding --- */
195
196 int8_t alignas(int32_t) pcm[2 * LC3_MAX_FRAME_SAMPLES*4];
197 uint8_t out[2 * LC3_MAX_FRAME_BYTES];
198 lc3_encoder_t enc[2];
199
200 int frame_bytes = lc3_frame_bytes(frame_us, p.bitrate / nch);
201 int frame_samples = lc3_frame_samples(frame_us, srate_hz);
202 int encode_samples = nsamples + lc3_delay_samples(frame_us, srate_hz);
203 enum lc3_pcm_format pcm_fmt =
204 pcm_sbytes == 32/8 ? LC3_PCM_FORMAT_S24 :
205 pcm_sbytes == 24/8 ? LC3_PCM_FORMAT_S24_3LE : LC3_PCM_FORMAT_S16;
206
207 for (int ich = 0; ich < nch; ich++)
208 enc[ich] = lc3_setup_encoder(frame_us, enc_srate_hz, srate_hz,
209 malloc(lc3_encoder_size(frame_us, srate_hz)));
210
211 /* --- Encoding loop --- */
212
213 static const char *dash_line = "========================================";
214
215 int nsec = 0;
216 unsigned t0 = clock_us();
217
218 for (int i = 0; i * frame_samples < encode_samples; i++) {
219
220 int nread = wave_read_pcm(fp_in, pcm_sbytes, nch, frame_samples, pcm);
221
222 memset(pcm + nread * nch * pcm_sbytes, 0,
223 nch * (frame_samples - nread) * pcm_sbytes);
224
225 if (floorf(i * frame_us * 1e-6) > nsec) {
226 float progress = fminf(
227 (float)i * frame_samples / encode_samples, 1);
228
229 fprintf(stderr, "%02d:%02d [%-40s]\r",
230 nsec / 60, nsec % 60,
231 dash_line + (int)floorf((1 - progress) * 40));
232
233 nsec = (int)(i * frame_us * 1e-6);
234 }
235
236 for (int ich = 0; ich < nch; ich++)
237 lc3_encode(enc[ich],
238 pcm_fmt, pcm + ich * pcm_sbytes, nch,
239 frame_bytes, out + ich * frame_bytes);
240
241 lc3bin_write_data(fp_out, out, nch, frame_bytes);
242 }
243
244 unsigned t = (clock_us() - t0) / 1000;
245 nsec = encode_samples / srate_hz;
246
247 fprintf(stderr, "%02d:%02d Encoded in %d.%d seconds %20s\n",
248 nsec / 60, nsec % 60, t / 1000, t % 1000, "");
249
250 /* --- Cleanup --- */
251
252 for (int ich = 0; ich < nch; ich++)
253 free(enc[ich]);
254
255 if (fp_in != stdin)
256 fclose(fp_in);
257
258 if (fp_out != stdout)
259 fclose(fp_out);
260 }
261
