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00027 #include "asterisk.h"
00028
00029 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 315257 $")
00030
00031 #include <unistd.h>
00032 #include <netinet/in.h>
00033 #include <arpa/inet.h>
00034 #include <stdlib.h>
00035 #include <sys/time.h>
00036 #include <stdio.h>
00037 #include <errno.h>
00038 #include <string.h>
00039
00040 #include "asterisk/lock.h"
00041 #include "asterisk/channel.h"
00042 #include "asterisk/file.h"
00043 #include "asterisk/logger.h"
00044 #include "asterisk/sched.h"
00045 #include "asterisk/module.h"
00046 #include "asterisk/endian.h"
00047
00048
00049
00050
00051
00052 #define WAV_BUF_SIZE 320
00053
00054 struct wav_desc {
00055 int bytes;
00056 int needsgain;
00057 int lasttimeout;
00058 int maxlen;
00059 struct timeval last;
00060 };
00061
00062 #define BLOCKSIZE 160
00063
00064 #define GAIN 0
00065
00066
00067 #if __BYTE_ORDER == __LITTLE_ENDIAN
00068 #define htoll(b) (b)
00069 #define htols(b) (b)
00070 #define ltohl(b) (b)
00071 #define ltohs(b) (b)
00072 #else
00073 #if __BYTE_ORDER == __BIG_ENDIAN
00074 #define htoll(b) \
00075 (((((b) ) & 0xFF) << 24) | \
00076 ((((b) >> 8) & 0xFF) << 16) | \
00077 ((((b) >> 16) & 0xFF) << 8) | \
00078 ((((b) >> 24) & 0xFF) ))
00079 #define htols(b) \
00080 (((((b) ) & 0xFF) << 8) | \
00081 ((((b) >> 8) & 0xFF) ))
00082 #define ltohl(b) htoll(b)
00083 #define ltohs(b) htols(b)
00084 #else
00085 #error "Endianess not defined"
00086 #endif
00087 #endif
00088
00089
00090 static int check_header_fmt(FILE *f, int hsize)
00091 {
00092 short format, chans, bysam, bisam;
00093 int bysec;
00094 int freq;
00095 if (hsize < 16) {
00096 ast_log(LOG_WARNING, "Unexpected header size %d\n", ltohl(hsize));
00097 return -1;
00098 }
00099 if (fread(&format, 1, 2, f) != 2) {
00100 ast_log(LOG_WARNING, "Read failed (format)\n");
00101 return -1;
00102 }
00103 if (ltohs(format) != 1) {
00104 ast_log(LOG_WARNING, "Not a wav file %d\n", ltohs(format));
00105 return -1;
00106 }
00107 if (fread(&chans, 1, 2, f) != 2) {
00108 ast_log(LOG_WARNING, "Read failed (format)\n");
00109 return -1;
00110 }
00111 if (ltohs(chans) != 1) {
00112 ast_log(LOG_WARNING, "Not in mono %d\n", ltohs(chans));
00113 return -1;
00114 }
00115 if (fread(&freq, 1, 4, f) != 4) {
00116 ast_log(LOG_WARNING, "Read failed (freq)\n");
00117 return -1;
00118 }
00119 if (ltohl(freq) != DEFAULT_SAMPLE_RATE) {
00120 ast_log(LOG_WARNING, "Unexpected frequency %d\n", ltohl(freq));
00121 return -1;
00122 }
00123
00124 if (fread(&bysec, 1, 4, f) != 4) {
00125 ast_log(LOG_WARNING, "Read failed (BYTES_PER_SECOND)\n");
00126 return -1;
00127 }
00128
00129 if (fread(&bysam, 1, 2, f) != 2) {
00130 ast_log(LOG_WARNING, "Read failed (BYTES_PER_SAMPLE)\n");
00131 return -1;
00132 }
00133 if (ltohs(bysam) != 2) {
00134 ast_log(LOG_WARNING, "Can only handle 16bits per sample: %d\n", ltohs(bysam));
00135 return -1;
00136 }
00137 if (fread(&bisam, 1, 2, f) != 2) {
00138 ast_log(LOG_WARNING, "Read failed (Bits Per Sample): %d\n", ltohs(bisam));
00139 return -1;
00140 }
00141
00142 if (fseek(f,ltohl(hsize)-16,SEEK_CUR) == -1 ) {
00143 ast_log(LOG_WARNING, "Failed to skip remaining header bytes: %d\n", ltohl(hsize)-16 );
00144 return -1;
00145 }
00146 return 0;
00147 }
00148
00149 static int check_header(FILE *f)
00150 {
00151 int type, size, formtype;
00152 int data;
00153 if (fread(&type, 1, 4, f) != 4) {
00154 ast_log(LOG_WARNING, "Read failed (type)\n");
00155 return -1;
00156 }
00157 if (fread(&size, 1, 4, f) != 4) {
00158 ast_log(LOG_WARNING, "Read failed (size)\n");
00159 return -1;
00160 }
00161 size = ltohl(size);
00162 if (fread(&formtype, 1, 4, f) != 4) {
00163 ast_log(LOG_WARNING, "Read failed (formtype)\n");
00164 return -1;
00165 }
00166 if (memcmp(&type, "RIFF", 4)) {
00167 ast_log(LOG_WARNING, "Does not begin with RIFF\n");
00168 return -1;
00169 }
00170 if (memcmp(&formtype, "WAVE", 4)) {
00171 ast_log(LOG_WARNING, "Does not contain WAVE\n");
00172 return -1;
00173 }
00174
00175 for(;;)
00176 {
00177 char buf[4];
00178
00179
00180 if (fread(&buf, 1, 4, f) != 4) {
00181 ast_log(LOG_WARNING, "Read failed (block header format)\n");
00182 return -1;
00183 }
00184
00185 if (fread(&data, 1, 4, f) != 4) {
00186 ast_log(LOG_WARNING, "Read failed (block '%.4s' header length)\n", buf);
00187 return -1;
00188 }
00189 data = ltohl(data);
00190 if (memcmp(&buf, "fmt ", 4) == 0) {
00191 if (check_header_fmt(f, data))
00192 return -1;
00193 continue;
00194 }
00195 if(memcmp(buf, "data", 4) == 0 )
00196 break;
00197 ast_log(LOG_DEBUG, "Skipping unknown block '%.4s'\n", buf);
00198 if (fseek(f,data,SEEK_CUR) == -1 ) {
00199 ast_log(LOG_WARNING, "Failed to skip '%.4s' block: %d\n", buf, data);
00200 return -1;
00201 }
00202 }
00203 #if 0
00204 curpos = lseek(fd, 0, SEEK_CUR);
00205 truelength = lseek(fd, 0, SEEK_END);
00206 lseek(fd, curpos, SEEK_SET);
00207 truelength -= curpos;
00208 #endif
00209 return data;
00210 }
00211
00212 static int update_header(FILE *f)
00213 {
00214 off_t cur,end;
00215 int datalen,filelen,bytes;
00216
00217 cur = ftello(f);
00218 fseek(f, 0, SEEK_END);
00219 end = ftello(f);
00220
00221 bytes = end - 44;
00222 datalen = htoll(bytes);
00223
00224 filelen = htoll(36 + bytes);
00225
00226 if (cur < 0) {
00227 ast_log(LOG_WARNING, "Unable to find our position: %s\n", strerror(errno));
00228 return -1;
00229 }
00230 if (fseek(f, 4, SEEK_SET)) {
00231 ast_log(LOG_WARNING, "Unable to set our position: %s\n", strerror(errno));
00232 return -1;
00233 }
00234 if (fwrite(&filelen, 1, 4, f) != 4) {
00235 ast_log(LOG_WARNING, "Unable to set write file size: %s\n", strerror(errno));
00236 return -1;
00237 }
00238 if (fseek(f, 40, SEEK_SET)) {
00239 ast_log(LOG_WARNING, "Unable to set our position: %s\n", strerror(errno));
00240 return -1;
00241 }
00242 if (fwrite(&datalen, 1, 4, f) != 4) {
00243 ast_log(LOG_WARNING, "Unable to set write datalen: %s\n", strerror(errno));
00244 return -1;
00245 }
00246 if (fseeko(f, cur, SEEK_SET)) {
00247 ast_log(LOG_WARNING, "Unable to return to position: %s\n", strerror(errno));
00248 return -1;
00249 }
00250 return 0;
00251 }
00252
00253 static int write_header(FILE *f)
00254 {
00255 unsigned int hz=htoll(8000);
00256 unsigned int bhz = htoll(16000);
00257 unsigned int hs = htoll(16);
00258 unsigned short fmt = htols(1);
00259 unsigned short chans = htols(1);
00260 unsigned short bysam = htols(2);
00261 unsigned short bisam = htols(16);
00262 unsigned int size = htoll(0);
00263
00264 fseek(f,0,SEEK_SET);
00265 if (fwrite("RIFF", 1, 4, f) != 4) {
00266 ast_log(LOG_WARNING, "Unable to write header\n");
00267 return -1;
00268 }
00269 if (fwrite(&size, 1, 4, f) != 4) {
00270 ast_log(LOG_WARNING, "Unable to write header\n");
00271 return -1;
00272 }
00273 if (fwrite("WAVEfmt ", 1, 8, f) != 8) {
00274 ast_log(LOG_WARNING, "Unable to write header\n");
00275 return -1;
00276 }
00277 if (fwrite(&hs, 1, 4, f) != 4) {
00278 ast_log(LOG_WARNING, "Unable to write header\n");
00279 return -1;
00280 }
00281 if (fwrite(&fmt, 1, 2, f) != 2) {
00282 ast_log(LOG_WARNING, "Unable to write header\n");
00283 return -1;
00284 }
00285 if (fwrite(&chans, 1, 2, f) != 2) {
00286 ast_log(LOG_WARNING, "Unable to write header\n");
00287 return -1;
00288 }
00289 if (fwrite(&hz, 1, 4, f) != 4) {
00290 ast_log(LOG_WARNING, "Unable to write header\n");
00291 return -1;
00292 }
00293 if (fwrite(&bhz, 1, 4, f) != 4) {
00294 ast_log(LOG_WARNING, "Unable to write header\n");
00295 return -1;
00296 }
00297 if (fwrite(&bysam, 1, 2, f) != 2) {
00298 ast_log(LOG_WARNING, "Unable to write header\n");
00299 return -1;
00300 }
00301 if (fwrite(&bisam, 1, 2, f) != 2) {
00302 ast_log(LOG_WARNING, "Unable to write header\n");
00303 return -1;
00304 }
00305 if (fwrite("data", 1, 4, f) != 4) {
00306 ast_log(LOG_WARNING, "Unable to write header\n");
00307 return -1;
00308 }
00309 if (fwrite(&size, 1, 4, f) != 4) {
00310 ast_log(LOG_WARNING, "Unable to write header\n");
00311 return -1;
00312 }
00313 return 0;
00314 }
00315
00316 static int wav_open(struct ast_filestream *s)
00317 {
00318
00319
00320
00321 struct wav_desc *tmp = (struct wav_desc *)s->_private;
00322 if ((tmp->maxlen = check_header(s->f)) < 0)
00323 return -1;
00324 return 0;
00325 }
00326
00327 static int wav_rewrite(struct ast_filestream *s, const char *comment)
00328 {
00329
00330
00331
00332
00333 if (write_header(s->f))
00334 return -1;
00335 return 0;
00336 }
00337
00338 static void wav_close(struct ast_filestream *s)
00339 {
00340 char zero = 0;
00341 struct wav_desc *fs = (struct wav_desc *)s->_private;
00342
00343 if (fs->bytes & 0x1) {
00344 if (!fwrite(&zero, 1, 1, s->f)) {
00345 ast_log(LOG_WARNING, "fwrite() failed: %s\n", strerror(errno));
00346 }
00347 }
00348 }
00349
00350 static struct ast_frame *wav_read(struct ast_filestream *s, int *whennext)
00351 {
00352 int res;
00353 int samples;
00354 int x;
00355 short *tmp;
00356 int bytes = WAV_BUF_SIZE;
00357 off_t here;
00358
00359 struct wav_desc *fs = (struct wav_desc *)s->_private;
00360
00361 here = ftello(s->f);
00362 if (fs->maxlen - here < bytes)
00363 bytes = fs->maxlen - here;
00364 if (bytes < 0)
00365 bytes = 0;
00366
00367 s->fr.frametype = AST_FRAME_VOICE;
00368 s->fr.subclass = AST_FORMAT_SLINEAR;
00369 s->fr.mallocd = 0;
00370 AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, bytes);
00371
00372 if ( (res = fread(s->fr.data, 1, s->fr.datalen, s->f)) <= 0 ) {
00373 if (res)
00374 ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno));
00375 return NULL;
00376 }
00377 s->fr.datalen = res;
00378 s->fr.samples = samples = res / 2;
00379
00380 tmp = (short *)(s->fr.data);
00381 #if __BYTE_ORDER == __BIG_ENDIAN
00382
00383 for( x = 0; x < samples; x++)
00384 tmp[x] = (tmp[x] << 8) | ((tmp[x] & 0xff00) >> 8);
00385 #endif
00386
00387 if (fs->needsgain) {
00388 for (x=0; x < samples; x++) {
00389 if (tmp[x] & ((1 << GAIN) - 1)) {
00390
00391
00392 fs->needsgain = 0;
00393 break;
00394 }
00395 }
00396 if (fs->needsgain) {
00397 for (x=0; x < samples; x++)
00398 tmp[x] = tmp[x] >> GAIN;
00399 }
00400 }
00401
00402 *whennext = samples;
00403 return &s->fr;
00404 }
00405
00406 static int wav_write(struct ast_filestream *fs, struct ast_frame *f)
00407 {
00408 int x;
00409 short tmp[8000], *tmpi;
00410 float tmpf;
00411 struct wav_desc *s = (struct wav_desc *)fs->_private;
00412 int res;
00413
00414 if (f->frametype != AST_FRAME_VOICE) {
00415 ast_log(LOG_WARNING, "Asked to write non-voice frame!\n");
00416 return -1;
00417 }
00418 if (f->subclass != AST_FORMAT_SLINEAR) {
00419 ast_log(LOG_WARNING, "Asked to write non-SLINEAR frame (%d)!\n", f->subclass);
00420 return -1;
00421 }
00422 if (f->datalen > sizeof(tmp)) {
00423 ast_log(LOG_WARNING, "Data length is too long\n");
00424 return -1;
00425 }
00426 if (!f->datalen)
00427 return -1;
00428
00429 #if 0
00430 printf("Data Length: %d\n", f->datalen);
00431 #endif
00432
00433 tmpi = f->data;
00434
00435 for (x=0;x<f->datalen/2;x++) {
00436 tmpf = ((float)tmpi[x]) * ((float)(1 << GAIN));
00437 if (tmpf > 32767.0)
00438 tmpf = 32767.0;
00439 if (tmpf < -32768.0)
00440 tmpf = -32768.0;
00441 tmp[x] = tmpf;
00442 tmp[x] &= ~((1 << GAIN) - 1);
00443
00444 #if __BYTE_ORDER == __BIG_ENDIAN
00445 tmp[x] = (tmp[x] << 8) | ((tmp[x] & 0xff00) >> 8);
00446 #endif
00447
00448 }
00449 if ((res = fwrite(tmp, 1, f->datalen, fs->f)) != f->datalen ) {
00450 ast_log(LOG_WARNING, "Bad write (%d): %s\n", res, strerror(errno));
00451 return -1;
00452 }
00453
00454 s->bytes += f->datalen;
00455 update_header(fs->f);
00456
00457 return 0;
00458
00459 }
00460
00461 static int wav_seek(struct ast_filestream *fs, off_t sample_offset, int whence)
00462 {
00463 off_t min, max, cur, offset = 0, samples;
00464
00465 samples = sample_offset * 2;
00466 min = 44;
00467 cur = ftello(fs->f);
00468 fseeko(fs->f, 0, SEEK_END);
00469 max = ftello(fs->f);
00470 if (whence == SEEK_SET)
00471 offset = samples + min;
00472 else if (whence == SEEK_CUR || whence == SEEK_FORCECUR)
00473 offset = samples + cur;
00474 else if (whence == SEEK_END)
00475 offset = max - samples;
00476 if (whence != SEEK_FORCECUR) {
00477 offset = (offset > max)?max:offset;
00478 }
00479
00480 offset = (offset < min)?min:offset;
00481 return fseeko(fs->f, offset, SEEK_SET);
00482 }
00483
00484 static int wav_trunc(struct ast_filestream *fs)
00485 {
00486 if (ftruncate(fileno(fs->f), ftello(fs->f)))
00487 return -1;
00488 return update_header(fs->f);
00489 }
00490
00491 static off_t wav_tell(struct ast_filestream *fs)
00492 {
00493 off_t offset;
00494 offset = ftello(fs->f);
00495
00496 return (offset - 44)/2;
00497 }
00498
00499 static const struct ast_format wav_f = {
00500 .name = "wav",
00501 .exts = "wav",
00502 .format = AST_FORMAT_SLINEAR,
00503 .open = wav_open,
00504 .rewrite = wav_rewrite,
00505 .write = wav_write,
00506 .seek = wav_seek,
00507 .trunc = wav_trunc,
00508 .tell = wav_tell,
00509 .read = wav_read,
00510 .close = wav_close,
00511 .buf_size = WAV_BUF_SIZE + AST_FRIENDLY_OFFSET,
00512 .desc_size = sizeof(struct wav_desc),
00513 };
00514
00515 static int load_module(void)
00516 {
00517 return ast_format_register(&wav_f);
00518 }
00519
00520 static int unload_module(void)
00521 {
00522 return ast_format_unregister(wav_f.name);
00523 }
00524
00525 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_FIRST, "Microsoft WAV format (8000Hz Signed Linear)",
00526 .load = load_module,
00527 .unload = unload_module,
00528 );