Annotation of src/usr.bin/aucat/wav.c, Revision 1.7
1.7 ! ratchov 1: /*
! 2: * Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
! 3: *
! 4: * Permission to use, copy, modify, and distribute this software for any
! 5: * purpose with or without fee is hereby granted, provided that the above
! 6: * copyright notice and this permission notice appear in all copies.
! 7: *
! 8: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
! 9: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
! 10: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
! 11: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
! 12: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
! 13: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
! 14: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
! 15: */
! 16:
1.1 ratchov 17: #include <sys/types.h>
1.7 ! ratchov 18:
1.1 ratchov 19: #include <err.h>
20: #include <fcntl.h>
21: #include <stdio.h>
22: #include <stdlib.h>
23: #include <unistd.h>
24:
25: #include "conf.h"
26: #include "wav.h"
27:
1.6 ratchov 28: short wav_ulawmap[256] = {
29: -32124, -31100, -30076, -29052, -28028, -27004, -25980, -24956,
30: -23932, -22908, -21884, -20860, -19836, -18812, -17788, -16764,
31: -15996, -15484, -14972, -14460, -13948, -13436, -12924, -12412,
32: -11900, -11388, -10876, -10364, -9852, -9340, -8828, -8316,
33: -7932, -7676, -7420, -7164, -6908, -6652, -6396, -6140,
34: -5884, -5628, -5372, -5116, -4860, -4604, -4348, -4092,
35: -3900, -3772, -3644, -3516, -3388, -3260, -3132, -3004,
36: -2876, -2748, -2620, -2492, -2364, -2236, -2108, -1980,
37: -1884, -1820, -1756, -1692, -1628, -1564, -1500, -1436,
38: -1372, -1308, -1244, -1180, -1116, -1052, -988, -924,
39: -876, -844, -812, -780, -748, -716, -684, -652,
40: -620, -588, -556, -524, -492, -460, -428, -396,
41: -372, -356, -340, -324, -308, -292, -276, -260,
42: -244, -228, -212, -196, -180, -164, -148, -132,
43: -120, -112, -104, -96, -88, -80, -72, -64,
44: -56, -48, -40, -32, -24, -16, -8, 0,
45: 32124, 31100, 30076, 29052, 28028, 27004, 25980, 24956,
46: 23932, 22908, 21884, 20860, 19836, 18812, 17788, 16764,
47: 15996, 15484, 14972, 14460, 13948, 13436, 12924, 12412,
48: 11900, 11388, 10876, 10364, 9852, 9340, 8828, 8316,
49: 7932, 7676, 7420, 7164, 6908, 6652, 6396, 6140,
50: 5884, 5628, 5372, 5116, 4860, 4604, 4348, 4092,
51: 3900, 3772, 3644, 3516, 3388, 3260, 3132, 3004,
52: 2876, 2748, 2620, 2492, 2364, 2236, 2108, 1980,
53: 1884, 1820, 1756, 1692, 1628, 1564, 1500, 1436,
54: 1372, 1308, 1244, 1180, 1116, 1052, 988, 924,
55: 876, 844, 812, 780, 748, 716, 684, 652,
56: 620, 588, 556, 524, 492, 460, 428, 396,
57: 372, 356, 340, 324, 308, 292, 276, 260,
58: 244, 228, 212, 196, 180, 164, 148, 132,
59: 120, 112, 104, 96, 88, 80, 72, 64,
60: 56, 48, 40, 32, 24, 16, 8, 0
61: };
62:
63: short wav_alawmap[256] = {
64: -5504, -5248, -6016, -5760, -4480, -4224, -4992, -4736,
65: -7552, -7296, -8064, -7808, -6528, -6272, -7040, -6784,
66: -2752, -2624, -3008, -2880, -2240, -2112, -2496, -2368,
67: -3776, -3648, -4032, -3904, -3264, -3136, -3520, -3392,
68: -22016, -20992, -24064, -23040, -17920, -16896, -19968, -18944,
69: -30208, -29184, -32256, -31232, -26112, -25088, -28160, -27136,
70: -11008, -10496, -12032, -11520, -8960, -8448, -9984, -9472,
71: -15104, -14592, -16128, -15616, -13056, -12544, -14080, -13568,
72: -344, -328, -376, -360, -280, -264, -312, -296,
73: -472, -456, -504, -488, -408, -392, -440, -424,
74: -88, -72, -120, -104, -24, -8, -56, -40,
75: -216, -200, -248, -232, -152, -136, -184, -168,
76: -1376, -1312, -1504, -1440, -1120, -1056, -1248, -1184,
77: -1888, -1824, -2016, -1952, -1632, -1568, -1760, -1696,
78: -688, -656, -752, -720, -560, -528, -624, -592,
79: -944, -912, -1008, -976, -816, -784, -880, -848,
80: 5504, 5248, 6016, 5760, 4480, 4224, 4992, 4736,
81: 7552, 7296, 8064, 7808, 6528, 6272, 7040, 6784,
82: 2752, 2624, 3008, 2880, 2240, 2112, 2496, 2368,
83: 3776, 3648, 4032, 3904, 3264, 3136, 3520, 3392,
84: 22016, 20992, 24064, 23040, 17920, 16896, 19968, 18944,
85: 30208, 29184, 32256, 31232, 26112, 25088, 28160, 27136,
86: 11008, 10496, 12032, 11520, 8960, 8448, 9984, 9472,
87: 15104, 14592, 16128, 15616, 13056, 12544, 14080, 13568,
88: 344, 328, 376, 360, 280, 264, 312, 296,
89: 472, 456, 504, 488, 408, 392, 440, 424,
90: 88, 72, 120, 104, 24, 8, 56, 40,
91: 216, 200, 248, 232, 152, 136, 184, 168,
92: 1376, 1312, 1504, 1440, 1120, 1056, 1248, 1184,
93: 1888, 1824, 2016, 1952, 1632, 1568, 1760, 1696,
94: 688, 656, 752, 720, 560, 528, 624, 592,
95: 944, 912, 1008, 976, 816, 784, 880, 848
96: };
97:
1.1 ratchov 98: /*
1.7 ! ratchov 99: * Max data of a .wav file. The total file size must be smaller than
1.1 ratchov 100: * 2^31, and we also have to leave some space for the headers (around 40
1.7 ! ratchov 101: * bytes).
1.3 ratchov 102: */
1.1 ratchov 103: #define WAV_DATAMAX (0x7fff0000)
104:
105: struct fileops wav_ops = {
106: "wav",
107: sizeof(struct wav),
108: wav_close,
109: wav_read,
110: wav_write,
111: NULL, /* start */
112: NULL, /* stop */
113: pipe_nfds,
114: pipe_pollfd,
115: pipe_revents
116: };
117:
118: struct wav *
119: wav_new_in(struct fileops *ops, int fd, char *name,
120: struct aparams *par, unsigned hdr)
121: {
122: struct wav *f;
123:
124: f = (struct wav *)pipe_new(ops, fd, name);
1.4 ratchov 125: if (f == NULL)
126: return NULL;
1.1 ratchov 127: if (hdr == HDR_WAV) {
1.6 ratchov 128: if (!wav_readhdr(f->pipe.fd, par, &f->rbytes, &f->map))
1.1 ratchov 129: exit(1);
130: f->hpar = *par;
1.6 ratchov 131: } else {
1.1 ratchov 132: f->rbytes = -1;
1.6 ratchov 133: f->map = NULL;
134: }
1.1 ratchov 135: f->hdr = 0;
136: return f;
137: }
138:
139: struct wav *
140: wav_new_out(struct fileops *ops, int fd, char *name,
141: struct aparams *par, unsigned hdr)
142: {
143: struct wav *f;
144:
145: f = (struct wav *)pipe_new(ops, fd, name);
1.4 ratchov 146: if (f == NULL)
147: return NULL;
1.1 ratchov 148: if (hdr == HDR_WAV) {
1.2 ratchov 149: par->le = 1;
1.3 ratchov 150: par->sig = (par->bits <= 8) ? 0 : 1;
1.2 ratchov 151: par->bps = (par->bits + 7) / 8;
1.1 ratchov 152: if (!wav_writehdr(f->pipe.fd, par))
153: exit(1);
154: f->hpar = *par;
155: f->wbytes = WAV_DATAMAX;
156: } else
157: f->wbytes = -1;
158: f->hdr = hdr;
159: return f;
160: }
161:
1.6 ratchov 162: void
163: wav_conv(unsigned char *data, unsigned count, short *map)
164: {
165: unsigned i;
166: unsigned char *iptr;
167: short *optr;
168:
169: iptr = data + count;
170: optr = (short *)data + count;
171: for (i = count; i > 0; i--) {
172: --optr;
173: --iptr;
174: *optr = map[*iptr];
175: }
176: }
177:
1.1 ratchov 178: unsigned
179: wav_read(struct file *file, unsigned char *data, unsigned count)
180: {
181: struct wav *f = (struct wav *)file;
182: unsigned n;
183:
1.6 ratchov 184: if (f->map)
185: count /= sizeof(short);
1.1 ratchov 186: if (f->rbytes >= 0 && count > f->rbytes) {
187: count = f->rbytes; /* file->rbytes fits in count */
188: if (count == 0) {
189: DPRINTFN(2, "wav_read: %s: complete\n", f->pipe.file.name);
190: file_eof(&f->pipe.file);
191: return 0;
192: }
193: }
194: n = pipe_read(file, data, count);
195: if (f->rbytes >= 0)
196: f->rbytes -= n;
1.6 ratchov 197: if (f->map) {
198: wav_conv(data, n, f->map);
199: n *= sizeof(short);
200: }
1.1 ratchov 201: return n;
202: }
203:
204: unsigned
205: wav_write(struct file *file, unsigned char *data, unsigned count)
206: {
207: struct wav *f = (struct wav *)file;
208: unsigned n;
1.3 ratchov 209:
1.1 ratchov 210: if (f->wbytes >= 0 && count > f->wbytes) {
211: count = f->wbytes; /* wbytes fits in count */
212: if (count == 0) {
213: DPRINTFN(2, "wav_write: %s: complete\n",
214: f->pipe.file.name);
215: file_hup(&f->pipe.file);
216: return 0;
217: }
218: }
219: n = pipe_write(file, data, count);
220: if (f->wbytes >= 0)
221: f->wbytes -= n;
222: return n;
223: }
224:
225: void
226: wav_close(struct file *file)
227: {
228: struct wav *f = (struct wav *)file;
229:
230: if (f->hdr == HDR_WAV)
231: wav_writehdr(f->pipe.fd, &f->hpar);
232: pipe_close(file);
233: }
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