Annotation of src/usr.bin/aucat/headers.c, Revision 1.6
1.6 ! ratchov 1: /* $OpenBSD: headers.c,v 1.5 2009/04/11 10:24:21 jakemsr Exp $ */
1.1 ratchov 2: /*
3: * Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
4: *
5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
8: *
9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16: */
17:
18: #include <sys/param.h>
19:
20: #include <err.h>
21: #include <stdio.h>
22: #include <stdlib.h>
23: #include <string.h>
24: #include <unistd.h>
25:
26: #include "conf.h"
27: #include "aparams.h"
1.6 ! ratchov 28: #include "wav.h"
! 29:
! 30: /*
! 31: * encoding IDs used in .wav headers
! 32: */
! 33: #define WAV_ENC_PCM 1
! 34: #define WAV_ENC_ALAW 6
! 35: #define WAV_ENC_ULAW 7
1.1 ratchov 36:
37: struct wavriff {
38: char magic[4];
39: uint32_t size;
40: char type[4];
41: } __packed;
42:
43: struct wavchunk {
44: char id[4];
45: uint32_t size;
46: } __packed;
47:
48: struct wavfmt {
49: uint16_t fmt;
50: uint16_t nch;
51: uint32_t rate;
52: uint32_t byterate;
53: uint16_t blkalign;
1.4 ratchov 54: uint16_t bits;
1.1 ratchov 55: } __packed;
56:
57: char wav_id_riff[4] = { 'R', 'I', 'F', 'F' };
58: char wav_id_wave[4] = { 'W', 'A', 'V', 'E' };
59: char wav_id_data[4] = { 'd', 'a', 't', 'a' };
60: char wav_id_fmt[4] = { 'f', 'm', 't', ' ' };
61:
62: int
1.6 ! ratchov 63: wav_readfmt(int fd, unsigned csize, struct aparams *par, short **map)
1.1 ratchov 64: {
65: struct wavfmt fmt;
66: unsigned nch, cmax, rate, bits, enc;
67:
68: if (csize < sizeof(fmt)) {
69: warnx("bogus format chunk");
70: return 0;
71: }
72: if (read(fd, &fmt, sizeof(fmt)) != sizeof(fmt)) {
73: warn("riff_read: chunk");
74: return 0;
75: }
76: enc = letoh16(fmt.fmt);
1.6 ! ratchov 77: switch (enc) {
! 78: case WAV_ENC_PCM:
! 79: *map = NULL;
! 80: break;
! 81: case WAV_ENC_ALAW:
! 82: *map = wav_alawmap;
! 83: break;
! 84: case WAV_ENC_ULAW:
! 85: *map = wav_ulawmap;
! 86: break;
! 87: default:
! 88: errx(1, "%u: unsupported encoding in .wav file", enc);
1.1 ratchov 89: }
90: nch = letoh16(fmt.nch);
91: if (nch == 0) {
92: warnx("zero number of channels");
93: return 0;
94: }
95: cmax = par->cmin + nch - 1;
1.2 ratchov 96: if (cmax >= NCHAN_MAX) {
1.1 ratchov 97: warnx("%u:%u: bad range", par->cmin, cmax);
98: return 0;
99: }
100: rate = letoh32(fmt.rate);
101: if (rate < RATE_MIN || rate >= RATE_MAX) {
102: warnx("%u: bad sample rate", rate);
103: return 0;
104: }
105: bits = letoh16(fmt.bits);
106: if (bits == 0 || bits >= 32) {
107: warnx("%u: bad number of bits", bits);
108: return 0;
109: }
1.6 ! ratchov 110: if (enc == WAV_ENC_PCM) {
! 111: par->bps = (bits + 7) / 8;
! 112: par->bits = bits;
! 113: par->le = 1;
! 114: par->sig = (bits <= 8) ? 0 : 1; /* ask microsoft why... */
! 115: } else {
! 116: if (bits != 8) {
! 117: warnx("%u: mulaw/alaw encoding not 8-bit", bits);
! 118: return 0;
! 119: }
! 120: par->bits = 8 * sizeof(short);
! 121: par->bps = sizeof(short);
! 122: par->le = NATIVE_LE;
! 123: par->sig = 1;
! 124: }
1.1 ratchov 125: par->msb = 1;
126: par->cmax = cmax;
127: par->rate = rate;
1.3 ratchov 128: #ifdef DEBUG
1.1 ratchov 129: if (debug_level > 0) {
130: fprintf(stderr, "wav_readfmt: using ");
131: aparams_print(par);
132: fprintf(stderr, "\n");
133: }
1.3 ratchov 134: #endif
1.1 ratchov 135: return 1;
136: }
137:
138: int
1.6 ! ratchov 139: wav_readhdr(int fd, struct aparams *par, off_t *datasz, short **map)
1.1 ratchov 140: {
141: struct wavriff riff;
142: struct wavchunk chunk;
143: unsigned csize, rsize, pos = 0;
144: int fmt_done = 0;
145:
146: if (lseek(fd, 0, SEEK_SET) < 0) {
147: warn("lseek: 0");
148: return 0;
149: }
150: if (read(fd, &riff, sizeof(riff)) != sizeof(riff)) {
151: warn("riff_read: header");
152: return 0;
153: }
154: if (memcmp(&riff.magic, &wav_id_riff, 4) != 0 ||
155: memcmp(&riff.type, &wav_id_wave, 4)) {
156: warnx("not a wave file");
157: return 0;
158: }
159: rsize = letoh32(riff.size);
160: while (pos + sizeof(struct wavchunk) <= rsize) {
161: if (read(fd, &chunk, sizeof(chunk)) != sizeof(chunk)) {
162: warn("riff_read: chunk");
163: return 0;
164: }
165: csize = letoh32(chunk.size);
166: if (memcmp(chunk.id, wav_id_fmt, 4) == 0) {
1.6 ! ratchov 167: if (!wav_readfmt(fd, csize, par, map))
1.1 ratchov 168: return 0;
169: fmt_done = 1;
170: } else if (memcmp(chunk.id, wav_id_data, 4) == 0) {
171: *datasz = csize;
172: break;
173: } else {
174: DPRINTF("unknown chunk: <%.4s>\n", chunk.id);
175: }
176:
177: /*
178: * next chunk
179: */
180: pos += sizeof(struct wavchunk) + csize;
181: if (lseek(fd, sizeof(riff) + pos, SEEK_SET) < 0) {
182: warn("lseek");
183: return 0;
184: }
185: }
186: if (!fmt_done) {
187: warnx("missing format chunk");
188: return 0;
189: }
190: return 1;
191: }
192:
193: int
194: wav_writehdr(int fd, struct aparams *par)
195: {
196: off_t datasz;
197: unsigned nch = par->cmax - par->cmin + 1;
198: struct {
199: struct wavriff riff;
200: struct wavchunk fmt_hdr;
201: struct wavfmt fmt;
202: struct wavchunk data_hdr;
203: } hdr;
204:
205: datasz = lseek(fd, 0, SEEK_CUR);
206: if (datasz < 0) {
207: warn("wav_writehdr: lseek(end)");
208: return 0;
209: }
210: if (datasz >= sizeof(hdr))
211: datasz -= sizeof(hdr);
212: else
213: datasz = 0;
214:
215: /*
216: * check that encoding is supported by .wav file format
217: */
218: if (par->bits > 8 && !par->le) {
219: warnx("samples must be little endian");
220: return 0;
221: }
222: if (8 * par->bps - par->bits >= 8) {
223: warnx("padding must be less than 8 bits");
224: return 0;
225: }
226: if ((par->bits <= 8 && par->sig) || (par->bits > 8 && !par->sig)) {
227: warnx("samples with more (less) than 8 bits must be signed (unsigned)");
228: return 0;
229: }
230: if (8 * par->bps != par->bits && !par->msb) {
231: warnx("samples must be MSB justified");
232: return 0;
233: }
234:
235: memcpy(hdr.riff.magic, wav_id_riff, 4);
236: memcpy(hdr.riff.type, wav_id_wave, 4);
237: hdr.riff.size = htole32(datasz + sizeof(hdr) - sizeof(hdr.riff));
238:
239: memcpy(hdr.fmt_hdr.id, wav_id_fmt, 4);
240: hdr.fmt_hdr.size = htole32(sizeof(hdr.fmt));
241: hdr.fmt.fmt = htole16(1);
242: hdr.fmt.nch = htole16(nch);
243: hdr.fmt.rate = htole32(par->rate);
244: hdr.fmt.byterate = htole32(par->rate * par->bps * nch);
245: hdr.fmt.bits = htole16(par->bits);
246: hdr.fmt.blkalign = 0;
247:
248: memcpy(hdr.data_hdr.id, wav_id_data, 4);
249: hdr.data_hdr.size = htole32(datasz);
1.4 ratchov 250:
1.1 ratchov 251: if (lseek(fd, 0, SEEK_SET) < 0) {
252: warn("wav_writehdr: lseek");
253: return 0;
254: }
255: if (write(fd, &hdr, sizeof(hdr)) != sizeof(hdr)) {
256: warn("wav_writehdr: write");
257: return 0;
258: }
259: return 1;
260: }
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