Flat, binary, ulaw PCM file format. More...
#include "asterisk.h"
#include "asterisk/mod_format.h"
#include "asterisk/module.h"
#include "asterisk/endian.h"
#include "asterisk/ulaw.h"
#include "asterisk/alaw.h"
Go to the source code of this file.
Defines | |
#define | AU_ENC_8BIT_ULAW 1 |
#define | AU_HDR_CHANNELS_OFF 5 |
#define | AU_HDR_DATA_SIZE_OFF 2 |
#define | AU_HDR_ENCODING_OFF 3 |
#define | AU_HDR_HDR_SIZE_OFF 1 |
#define | AU_HDR_MAGIC_OFF 0 |
#define | AU_HDR_SAMPLE_RATE_OFF 4 |
#define | AU_HEADER(var) uint32_t var[6] |
#define | AU_HEADER_SIZE 24 |
#define | AU_MAGIC 0x2e736e64 |
#define | BUF_SIZE 160 |
#define | htoll(b) (b) |
#define | htols(b) (b) |
#define | ltohl(b) (b) |
#define | ltohs(b) (b) |
Functions | |
AST_MODULE_INFO (ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER,"Raw/Sun uLaw/ALaw 8KHz (PCM,PCMA,AU), G.722 16Khz",.load=load_module,.unload=unload_module,.load_pri=AST_MODPRI_APP_DEPEND) | |
static int | au_open (struct ast_filestream *s) |
static int | au_rewrite (struct ast_filestream *s, const char *comment) |
static int | au_seek (struct ast_filestream *fs, off_t sample_offset, int whence) |
static off_t | au_tell (struct ast_filestream *fs) |
static int | au_trunc (struct ast_filestream *fs) |
static int | check_header (FILE *f) |
static int | load_module (void) |
static struct ast_frame * | pcm_read (struct ast_filestream *s, int *whennext) |
static int | pcm_seek (struct ast_filestream *fs, off_t sample_offset, int whence) |
static off_t | pcm_tell (struct ast_filestream *fs) |
static int | pcm_trunc (struct ast_filestream *fs) |
static int | pcm_write (struct ast_filestream *fs, struct ast_frame *f) |
static int | unload_module (void) |
static int | update_header (FILE *f) |
static int | write_header (FILE *f) |
Variables | |
static struct ast_format | alaw_f |
static char | alaw_silence [BUF_SIZE] |
static struct ast_format | au_f |
static struct ast_format | g722_f |
static struct ast_format | pcm_f |
static char | ulaw_silence [BUF_SIZE] |
Flat, binary, ulaw PCM file format.
Definition in file format_pcm.c.
#define AU_ENC_8BIT_ULAW 1 |
Definition at line 257 of file format_pcm.c.
Referenced by check_header(), and write_header().
#define AU_HDR_CHANNELS_OFF 5 |
Definition at line 255 of file format_pcm.c.
Referenced by check_header(), and write_header().
#define AU_HDR_DATA_SIZE_OFF 2 |
Definition at line 252 of file format_pcm.c.
Referenced by update_header(), and write_header().
#define AU_HDR_ENCODING_OFF 3 |
Definition at line 253 of file format_pcm.c.
Referenced by check_header(), and write_header().
#define AU_HDR_HDR_SIZE_OFF 1 |
Definition at line 251 of file format_pcm.c.
Referenced by check_header(), and write_header().
#define AU_HDR_MAGIC_OFF 0 |
Definition at line 250 of file format_pcm.c.
Referenced by check_header(), and write_header().
#define AU_HDR_SAMPLE_RATE_OFF 4 |
Definition at line 254 of file format_pcm.c.
Referenced by check_header(), and write_header().
#define AU_HEADER | ( | var | ) | uint32_t var[6] |
Definition at line 248 of file format_pcm.c.
Referenced by check_header(), and write_header().
#define AU_HEADER_SIZE 24 |
Definition at line 247 of file format_pcm.c.
Referenced by au_seek(), au_tell(), check_header(), update_header(), and write_header().
#define AU_MAGIC 0x2e736e64 |
Definition at line 259 of file format_pcm.c.
Referenced by check_header(), and write_header().
#define BUF_SIZE 160 |
Definition at line 41 of file format_pcm.c.
#define htoll | ( | b | ) | (b) |
Definition at line 261 of file format_pcm.c.
Referenced by update_header(), and write_header().
#define htols | ( | b | ) | (b) |
Definition at line 262 of file format_pcm.c.
Referenced by write_header().
#define ltohl | ( | b | ) | (b) |
Definition at line 263 of file format_pcm.c.
Referenced by check_header(), and check_header_fmt().
#define ltohs | ( | b | ) | (b) |
Definition at line 264 of file format_pcm.c.
Referenced by check_header(), and check_header_fmt().
AST_MODULE_INFO | ( | ASTERISK_GPL_KEY | , | |
AST_MODFLAG_LOAD_ORDER | , | |||
"Raw/Sun uLaw/ALaw 8KHz | PCM,PCMA,AU, | |||
G.722 16Khz" | , | |||
. | load = load_module , |
|||
. | unload = unload_module , |
|||
. | load_pri = AST_MODPRI_APP_DEPEND | |||
) |
static int au_open | ( | struct ast_filestream * | s | ) | [static] |
Definition at line 382 of file format_pcm.c.
References check_header(), and ast_filestream::f.
00383 { 00384 if (check_header(s->f) < 0) 00385 return -1; 00386 return 0; 00387 }
static int au_rewrite | ( | struct ast_filestream * | s, | |
const char * | comment | |||
) | [static] |
Definition at line 389 of file format_pcm.c.
References ast_filestream::f, and write_header().
00390 { 00391 if (write_header(s->f)) 00392 return -1; 00393 return 0; 00394 }
static int au_seek | ( | struct ast_filestream * | fs, | |
off_t | sample_offset, | |||
int | whence | |||
) | [static] |
Definition at line 397 of file format_pcm.c.
References AST_FORMAT_G722, ast_log(), AST_LOG_WARNING, AU_HEADER_SIZE, errno, ast_filestream::f, ast_filestream::fmt, ast_format::format, and SEEK_FORCECUR.
00398 { 00399 off_t min = AU_HEADER_SIZE, max, cur; 00400 long offset = 0, bytes; 00401 00402 if (fs->fmt->format == AST_FORMAT_G722) 00403 bytes = sample_offset / 2; 00404 else 00405 bytes = sample_offset; 00406 00407 if ((cur = ftello(fs->f)) < 0) { 00408 ast_log(AST_LOG_WARNING, "Unable to determine current position in au filestream %p: %s\n", fs, strerror(errno)); 00409 return -1; 00410 } 00411 00412 if (fseeko(fs->f, 0, SEEK_END) < 0) { 00413 ast_log(AST_LOG_WARNING, "Unable to seek to end of au filestream %p: %s\n", fs, strerror(errno)); 00414 return -1; 00415 } 00416 00417 if ((max = ftello(fs->f)) < 0) { 00418 ast_log(AST_LOG_WARNING, "Unable to determine max position in au filestream %p: %s\n", fs, strerror(errno)); 00419 return -1; 00420 } 00421 00422 if (whence == SEEK_SET) 00423 offset = bytes + min; 00424 else if (whence == SEEK_CUR || whence == SEEK_FORCECUR) 00425 offset = bytes + cur; 00426 else if (whence == SEEK_END) 00427 offset = max - bytes; 00428 00429 if (whence != SEEK_FORCECUR) { 00430 offset = (offset > max) ? max : offset; 00431 } 00432 00433 /* always protect the header space. */ 00434 offset = (offset < min) ? min : offset; 00435 00436 return fseeko(fs->f, offset, SEEK_SET); 00437 }
static off_t au_tell | ( | struct ast_filestream * | fs | ) | [static] |
Definition at line 459 of file format_pcm.c.
References AU_HEADER_SIZE, and ast_filestream::f.
00460 { 00461 off_t offset = ftello(fs->f); 00462 return offset - AU_HEADER_SIZE; 00463 }
static int au_trunc | ( | struct ast_filestream * | fs | ) | [static] |
Definition at line 439 of file format_pcm.c.
References ast_log(), AST_LOG_WARNING, errno, ast_filestream::f, and update_header().
00440 { 00441 int fd; 00442 off_t cur; 00443 00444 if ((fd = fileno(fs->f)) < 0) { 00445 ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for au filestream %p: %s\n", fs, strerror(errno)); 00446 return -1; 00447 } 00448 if ((cur = ftello(fs->f)) < 0) { 00449 ast_log(AST_LOG_WARNING, "Unable to determine current position in au filestream %p: %s\n", fs, strerror(errno)); 00450 return -1; 00451 } 00452 /* Truncate file to current length */ 00453 if (ftruncate(fd, cur)) { 00454 return -1; 00455 } 00456 return update_header(fs->f); 00457 }
static int check_header | ( | FILE * | f | ) | [static] |
Definition at line 282 of file format_pcm.c.
References ast_log(), AU_ENC_8BIT_ULAW, AU_HDR_CHANNELS_OFF, AU_HDR_ENCODING_OFF, AU_HDR_HDR_SIZE_OFF, AU_HDR_MAGIC_OFF, AU_HDR_SAMPLE_RATE_OFF, AU_HEADER, AU_HEADER_SIZE, AU_MAGIC, channels, DEFAULT_SAMPLE_RATE, encoding, LOG_WARNING, and ltohl.
Referenced by au_open().
00283 { 00284 AU_HEADER(header); 00285 uint32_t magic; 00286 uint32_t hdr_size; 00287 uint32_t data_size; 00288 uint32_t encoding; 00289 uint32_t sample_rate; 00290 uint32_t channels; 00291 00292 if (fread(header, 1, AU_HEADER_SIZE, f) != AU_HEADER_SIZE) { 00293 ast_log(LOG_WARNING, "Read failed (header)\n"); 00294 return -1; 00295 } 00296 magic = ltohl(header[AU_HDR_MAGIC_OFF]); 00297 if (magic != (uint32_t) AU_MAGIC) { 00298 ast_log(LOG_WARNING, "Bad magic: 0x%x\n", magic); 00299 } 00300 hdr_size = ltohl(header[AU_HDR_HDR_SIZE_OFF]); 00301 if (hdr_size < AU_HEADER_SIZE) { 00302 hdr_size = AU_HEADER_SIZE; 00303 } 00304 /* data_size = ltohl(header[AU_HDR_DATA_SIZE_OFF]); */ 00305 encoding = ltohl(header[AU_HDR_ENCODING_OFF]); 00306 if (encoding != AU_ENC_8BIT_ULAW) { 00307 ast_log(LOG_WARNING, "Unexpected format: %d. Only 8bit ULAW allowed (%d)\n", encoding, AU_ENC_8BIT_ULAW); 00308 return -1; 00309 } 00310 sample_rate = ltohl(header[AU_HDR_SAMPLE_RATE_OFF]); 00311 if (sample_rate != DEFAULT_SAMPLE_RATE) { 00312 ast_log(LOG_WARNING, "Sample rate can only be 8000 not %d\n", sample_rate); 00313 return -1; 00314 } 00315 channels = ltohl(header[AU_HDR_CHANNELS_OFF]); 00316 if (channels != 1) { 00317 ast_log(LOG_WARNING, "Not in mono: channels=%d\n", channels); 00318 return -1; 00319 } 00320 /* Skip to data */ 00321 fseek(f, 0, SEEK_END); 00322 data_size = ftell(f) - hdr_size; 00323 if (fseek(f, hdr_size, SEEK_SET) == -1 ) { 00324 ast_log(LOG_WARNING, "Failed to skip to data: %d\n", hdr_size); 00325 return -1; 00326 } 00327 return data_size; 00328 }
static int load_module | ( | void | ) | [static] |
Definition at line 520 of file format_pcm.c.
References ARRAY_LEN, ast_format_register, AST_LIN2A, AST_LIN2MU, AST_MODULE_LOAD_FAILURE, and AST_MODULE_LOAD_SUCCESS.
00521 { 00522 int i; 00523 00524 /* XXX better init ? */ 00525 for (i = 0; i < ARRAY_LEN(ulaw_silence); i++) 00526 ulaw_silence[i] = AST_LIN2MU(0); 00527 for (i = 0; i < ARRAY_LEN(alaw_silence); i++) 00528 alaw_silence[i] = AST_LIN2A(0); 00529 00530 if ( ast_format_register(&pcm_f) 00531 || ast_format_register(&alaw_f) 00532 || ast_format_register(&au_f) 00533 || ast_format_register(&g722_f) ) 00534 return AST_MODULE_LOAD_FAILURE; 00535 return AST_MODULE_LOAD_SUCCESS; 00536 }
static struct ast_frame* pcm_read | ( | struct ast_filestream * | s, | |
int * | whennext | |||
) | [static, read] |
Definition at line 80 of file format_pcm.c.
References AST_FORMAT_G722, AST_FRAME_SET_BUFFER, AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_log(), ast_filestream::buf, BUF_SIZE, ast_frame_subclass::codec, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_filestream::fmt, ast_format::format, ast_filestream::fr, ast_frame::frametype, LOG_WARNING, ast_frame::mallocd, ast_frame::ptr, ast_frame::samples, and ast_frame::subclass.
00081 { 00082 int res; 00083 00084 /* Send a frame from the file to the appropriate channel */ 00085 00086 s->fr.frametype = AST_FRAME_VOICE; 00087 s->fr.subclass.codec = s->fmt->format; 00088 s->fr.mallocd = 0; 00089 AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, BUF_SIZE); 00090 if ((res = fread(s->fr.data.ptr, 1, s->fr.datalen, s->f)) < 1) { 00091 if (res) 00092 ast_log(LOG_WARNING, "Short read (%d) (%s)!\n", res, strerror(errno)); 00093 return NULL; 00094 } 00095 s->fr.datalen = res; 00096 if (s->fmt->format == AST_FORMAT_G722) 00097 *whennext = s->fr.samples = res * 2; 00098 else 00099 *whennext = s->fr.samples = res; 00100 return &s->fr; 00101 }
static int pcm_seek | ( | struct ast_filestream * | fs, | |
off_t | sample_offset, | |||
int | whence | |||
) | [static] |
Definition at line 103 of file format_pcm.c.
References AST_FORMAT_ALAW, ast_log(), AST_LOG_WARNING, BUF_SIZE, errno, ast_filestream::f, ast_filestream::fmt, ast_format::format, LOG_WARNING, ast_frame::offset, SEEK_FORCECUR, and ast_frame::src.
00104 { 00105 off_t cur, max, offset = 0; 00106 int ret = -1; /* assume error */ 00107 00108 if ((cur = ftello(fs->f)) < 0) { 00109 ast_log(AST_LOG_WARNING, "Unable to determine current position in pcm filestream %p: %s\n", fs, strerror(errno)); 00110 return -1; 00111 } 00112 00113 if (fseeko(fs->f, 0, SEEK_END) < 0) { 00114 ast_log(AST_LOG_WARNING, "Unable to seek to end of pcm filestream %p: %s\n", fs, strerror(errno)); 00115 return -1; 00116 } 00117 00118 if ((max = ftello(fs->f)) < 0) { 00119 ast_log(AST_LOG_WARNING, "Unable to determine max position in pcm filestream %p: %s\n", fs, strerror(errno)); 00120 return -1; 00121 } 00122 00123 switch (whence) { 00124 case SEEK_SET: 00125 offset = sample_offset; 00126 break; 00127 case SEEK_END: 00128 offset = max - sample_offset; 00129 break; 00130 case SEEK_CUR: 00131 case SEEK_FORCECUR: 00132 offset = cur + sample_offset; 00133 break; 00134 default: 00135 ast_log(LOG_WARNING, "invalid whence %d, assuming SEEK_SET\n", whence); 00136 offset = sample_offset; 00137 } 00138 if (offset < 0) { 00139 ast_log(LOG_WARNING, "negative offset %ld, resetting to 0\n", (long) offset); 00140 offset = 0; 00141 } 00142 if (whence == SEEK_FORCECUR && offset > max) { /* extend the file */ 00143 size_t left = offset - max; 00144 const char *src = (fs->fmt->format == AST_FORMAT_ALAW) ? alaw_silence : ulaw_silence; 00145 00146 while (left) { 00147 size_t written = fwrite(src, 1, (left > BUF_SIZE) ? BUF_SIZE : left, fs->f); 00148 if (written == -1) 00149 break; /* error */ 00150 left -= written; 00151 } 00152 ret = 0; /* successful */ 00153 } else { 00154 if (offset > max) { 00155 ast_log(LOG_WARNING, "offset too large %ld, truncating to %ld\n", (long) offset, (long) max); 00156 offset = max; 00157 } 00158 ret = fseeko(fs->f, offset, SEEK_SET); 00159 } 00160 return ret; 00161 }
static off_t pcm_tell | ( | struct ast_filestream * | fs | ) | [static] |
Definition at line 179 of file format_pcm.c.
References ast_filestream::f.
00180 { 00181 return ftello(fs->f); 00182 }
static int pcm_trunc | ( | struct ast_filestream * | fs | ) | [static] |
Definition at line 163 of file format_pcm.c.
References ast_log(), AST_LOG_WARNING, errno, and ast_filestream::f.
00164 { 00165 int cur, fd; 00166 00167 if ((fd = fileno(fs->f)) < 0) { 00168 ast_log(AST_LOG_WARNING, "Unable to determine file descriptor for pcm filestream %p: %s\n", fs, strerror(errno)); 00169 return -1; 00170 } 00171 if ((cur = ftello(fs->f)) < 0) { 00172 ast_log(AST_LOG_WARNING, "Unable to determine current position in pcm filestream %p: %s\n", fs, strerror(errno)); 00173 return -1; 00174 } 00175 /* Truncate file to current length */ 00176 return ftruncate(fd, cur); 00177 }
static int pcm_write | ( | struct ast_filestream * | fs, | |
struct ast_frame * | f | |||
) | [static] |
Definition at line 184 of file format_pcm.c.
References ast_filestream::_private, AST_FORMAT_ALAW, AST_FRAME_VOICE, ast_getformatname(), ast_log(), ast_frame_subclass::codec, ast_frame::data, ast_frame::datalen, errno, ast_filestream::f, ast_filestream::fmt, ast_format::format, ast_frame::frametype, LOG_WARNING, ast_frame::ptr, and ast_frame::subclass.
00185 { 00186 int res; 00187 00188 if (f->frametype != AST_FRAME_VOICE) { 00189 ast_log(LOG_WARNING, "Asked to write non-voice frame!\n"); 00190 return -1; 00191 } 00192 if (f->subclass.codec != fs->fmt->format) { 00193 ast_log(LOG_WARNING, "Asked to write incompatible format frame (%s)!\n", ast_getformatname(f->subclass.codec)); 00194 return -1; 00195 } 00196 00197 #ifdef REALTIME_WRITE 00198 if (s->fmt->format == AST_FORMAT_ALAW) { 00199 struct pcm_desc *pd = (struct pcm_desc *)fs->_private; 00200 struct stat stat_buf; 00201 unsigned long cur_time = get_time(); 00202 unsigned long fpos = ( cur_time - pd->start_time ) * 8; /* 8 bytes per msec */ 00203 /* Check if we have written to this position yet. If we have, then increment pos by one frame 00204 * for some degree of protection against receiving packets in the same clock tick. 00205 */ 00206 00207 fstat(fileno(fs->f), &stat_buf ); 00208 if (stat_buf.st_size > fpos ) 00209 fpos += f->datalen; /* Incrementing with the size of this current frame */ 00210 00211 if (stat_buf.st_size < fpos) { 00212 /* fill the gap with 0x55 rather than 0. */ 00213 char buf[1024]; 00214 unsigned long cur, to_write; 00215 00216 cur = stat_buf.st_size; 00217 if (fseek(fs->f, cur, SEEK_SET) < 0) { 00218 ast_log( LOG_WARNING, "Cannot seek in file: %s\n", strerror(errno) ); 00219 return -1; 00220 } 00221 memset(buf, 0x55, 512); 00222 while (cur < fpos) { 00223 to_write = fpos - cur; 00224 if (to_write > sizeof(buf)) 00225 to_write = sizeof(buf); 00226 fwrite(buf, 1, to_write, fs->f); 00227 cur += to_write; 00228 } 00229 } 00230 00231 if (fseek(s->f, fpos, SEEK_SET) < 0) { 00232 ast_log( LOG_WARNING, "Cannot seek in file: %s\n", strerror(errno) ); 00233 return -1; 00234 } 00235 } 00236 #endif /* REALTIME_WRITE */ 00237 00238 if ((res = fwrite(f->data.ptr, 1, f->datalen, fs->f)) != f->datalen) { 00239 ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno)); 00240 return -1; 00241 } 00242 return 0; 00243 }
static int unload_module | ( | void | ) | [static] |
Definition at line 538 of file format_pcm.c.
References ast_format_unregister(), and ast_format::name.
00539 { 00540 return ast_format_unregister(pcm_f.name) 00541 || ast_format_unregister(alaw_f.name) 00542 || ast_format_unregister(au_f.name) 00543 || ast_format_unregister(g722_f.name); 00544 }
static int update_header | ( | FILE * | f | ) | [static] |
Definition at line 330 of file format_pcm.c.
References ast_log(), AU_HDR_DATA_SIZE_OFF, AU_HEADER_SIZE, htoll, and LOG_WARNING.
Referenced by au_trunc().
00331 { 00332 off_t cur, end; 00333 uint32_t datalen; 00334 int bytes; 00335 00336 cur = ftell(f); 00337 fseek(f, 0, SEEK_END); 00338 end = ftell(f); 00339 /* data starts 24 bytes in */ 00340 bytes = end - AU_HEADER_SIZE; 00341 datalen = htoll(bytes); 00342 00343 if (cur < 0) { 00344 ast_log(LOG_WARNING, "Unable to find our position\n"); 00345 return -1; 00346 } 00347 if (fseek(f, AU_HDR_DATA_SIZE_OFF * sizeof(uint32_t), SEEK_SET)) { 00348 ast_log(LOG_WARNING, "Unable to set our position\n"); 00349 return -1; 00350 } 00351 if (fwrite(&datalen, 1, sizeof(datalen), f) != sizeof(datalen)) { 00352 ast_log(LOG_WARNING, "Unable to set write file size\n"); 00353 return -1; 00354 } 00355 if (fseek(f, cur, SEEK_SET)) { 00356 ast_log(LOG_WARNING, "Unable to return to position\n"); 00357 return -1; 00358 } 00359 return 0; 00360 }
static int write_header | ( | FILE * | f | ) | [static] |
Definition at line 362 of file format_pcm.c.
References ast_log(), AU_ENC_8BIT_ULAW, AU_HDR_CHANNELS_OFF, AU_HDR_DATA_SIZE_OFF, AU_HDR_ENCODING_OFF, AU_HDR_HDR_SIZE_OFF, AU_HDR_MAGIC_OFF, AU_HDR_SAMPLE_RATE_OFF, AU_HEADER, AU_HEADER_SIZE, AU_MAGIC, DEFAULT_SAMPLE_RATE, htoll, and LOG_WARNING.
Referenced by au_rewrite().
00363 { 00364 AU_HEADER(header); 00365 00366 header[AU_HDR_MAGIC_OFF] = htoll((uint32_t) AU_MAGIC); 00367 header[AU_HDR_HDR_SIZE_OFF] = htoll(AU_HEADER_SIZE); 00368 header[AU_HDR_DATA_SIZE_OFF] = 0; 00369 header[AU_HDR_ENCODING_OFF] = htoll(AU_ENC_8BIT_ULAW); 00370 header[AU_HDR_SAMPLE_RATE_OFF] = htoll(DEFAULT_SAMPLE_RATE); 00371 header[AU_HDR_CHANNELS_OFF] = htoll(1); 00372 00373 /* Write an au header, ignoring sizes which will be filled in later */ 00374 fseek(f, 0, SEEK_SET); 00375 if (fwrite(header, 1, AU_HEADER_SIZE, f) != AU_HEADER_SIZE) { 00376 ast_log(LOG_WARNING, "Unable to write header\n"); 00377 return -1; 00378 } 00379 return 0; 00380 }
struct ast_format alaw_f [static] |
Definition at line 465 of file format_pcm.c.
char alaw_silence[BUF_SIZE] [static] |
Definition at line 44 of file format_pcm.c.
struct ast_format au_f [static] |
Definition at line 506 of file format_pcm.c.
struct ast_format g722_f [static] |
Definition at line 494 of file format_pcm.c.
struct ast_format pcm_f [static] |
Definition at line 482 of file format_pcm.c.
char ulaw_silence[BUF_SIZE] [static] |
Definition at line 43 of file format_pcm.c.