Wed Oct 28 11:45:36 2009

Asterisk developer's documentation


codec_dahdi.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * DAHDI native transcoding support
00005  *
00006  * Copyright (C) 1999 - 2008, Digium, Inc.
00007  *
00008  * Mark Spencer <markster@digium.com>
00009  * Kevin P. Fleming <kpfleming@digium.com>
00010  *
00011  * See http://www.asterisk.org for more information about
00012  * the Asterisk project. Please do not directly contact
00013  * any of the maintainers of this project for assistance;
00014  * the project provides a web site, mailing lists and IRC
00015  * channels for your use.
00016  *
00017  * This program is free software, distributed under the terms of
00018  * the GNU General Public License Version 2. See the LICENSE file
00019  * at the top of the source tree.
00020  */
00021 
00022 /*! \file
00023  *
00024  * \brief Translate between various formats natively through DAHDI transcoding
00025  *
00026  * \ingroup codecs
00027  */
00028 
00029 /*** MODULEINFO
00030    <depend>dahdi</depend>
00031  ***/
00032 
00033 #include "asterisk.h"
00034 
00035 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 224933 $")
00036 
00037 #include <fcntl.h>
00038 #include <netinet/in.h>
00039 #include <sys/ioctl.h>
00040 #include <sys/mman.h>
00041 #include <sys/poll.h>
00042 #include <dahdi/user.h>
00043 
00044 #include "asterisk/lock.h"
00045 #include "asterisk/translate.h"
00046 #include "asterisk/config.h"
00047 #include "asterisk/module.h"
00048 #include "asterisk/cli.h"
00049 #include "asterisk/channel.h"
00050 #include "asterisk/utils.h"
00051 #include "asterisk/linkedlists.h"
00052 #include "asterisk/ulaw.h"
00053 
00054 #define BUFFER_SIZE 8000
00055 
00056 #define G723_SAMPLES 240
00057 #define G729_SAMPLES 160
00058 
00059 static unsigned int global_useplc = 0;
00060 
00061 static struct channel_usage {
00062    int total;
00063    int encoders;
00064    int decoders;
00065 } channels;
00066 
00067 static char *handle_cli_transcoder_show(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a);
00068 
00069 static struct ast_cli_entry cli[] = {
00070    AST_CLI_DEFINE(handle_cli_transcoder_show, "Display DAHDI transcoder utilization.")
00071 };
00072 
00073 struct format_map {
00074    unsigned int map[32][32];
00075 };
00076 
00077 static struct format_map global_format_map = { { { 0 } } };
00078 
00079 struct translator {
00080    struct ast_translator t;
00081    AST_LIST_ENTRY(translator) entry;
00082 };
00083 
00084 static AST_LIST_HEAD_STATIC(translators, translator);
00085 
00086 struct codec_dahdi_pvt {
00087    int fd;
00088    struct dahdi_transcoder_formats fmts;
00089    unsigned int softslin:1;
00090    unsigned int fake:2;
00091    uint16_t required_samples;
00092    uint16_t samples_in_buffer;
00093    uint8_t ulaw_buffer[1024];
00094 };
00095 
00096 /* Only used by a decoder */
00097 static int ulawtolin(struct ast_trans_pvt *pvt)
00098 {
00099    struct codec_dahdi_pvt *dahdip = pvt->pvt;
00100    int i = dahdip->required_samples;
00101    uint8_t *src = &dahdip->ulaw_buffer[0];
00102    int16_t *dst = (int16_t *)pvt->outbuf + pvt->datalen;
00103 
00104    /* convert and copy in outbuf */
00105    while (i--) {
00106       *dst++ = AST_MULAW(*src++);
00107    }
00108 
00109    return 0;
00110 }
00111 
00112 /* Only used by an encoder. */
00113 static int lintoulaw(struct ast_trans_pvt *pvt, struct ast_frame *f)
00114 {
00115    struct codec_dahdi_pvt *dahdip = pvt->pvt;
00116    int i = f->samples;
00117    uint8_t *dst = &dahdip->ulaw_buffer[dahdip->samples_in_buffer];
00118    int16_t *src = f->data;
00119 
00120    if (dahdip->samples_in_buffer + i > sizeof(dahdip->ulaw_buffer)) {
00121       ast_log(LOG_ERROR, "Out of buffer space!\n");
00122       return -i;
00123    }
00124 
00125    while (i--) {
00126       *dst++ = AST_LIN2MU(*src++);
00127    }
00128 
00129    dahdip->samples_in_buffer += f->samples;
00130    return 0;
00131 }
00132 
00133 static char *handle_cli_transcoder_show(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00134 {
00135    struct channel_usage copy;
00136 
00137    switch (cmd) {
00138    case CLI_INIT:
00139       e->command = "transcoder show";
00140       e->usage =
00141          "Usage: transcoder show\n"
00142          "       Displays channel utilization of DAHDI transcoder(s).\n";
00143       return NULL;
00144    case CLI_GENERATE:
00145       return NULL;
00146    }
00147 
00148    if (a->argc != 2)
00149       return CLI_SHOWUSAGE;
00150 
00151    copy = channels;
00152 
00153    if (copy.total == 0)
00154       ast_cli(a->fd, "No DAHDI transcoders found.\n");
00155    else
00156       ast_cli(a->fd, "%d/%d encoders/decoders of %d channels are in use.\n", copy.encoders, copy.decoders, copy.total);
00157 
00158    return CLI_SUCCESS;
00159 }
00160 
00161 static void dahdi_write_frame(struct codec_dahdi_pvt *dahdip, const uint8_t *buffer, const ssize_t count)
00162 {
00163    int res;
00164    struct pollfd p = {0};
00165    if (!count) return;
00166    res = write(dahdip->fd, buffer, count);
00167    if (option_verbose > 10) {
00168       if (-1 == res) {
00169          ast_log(LOG_ERROR, "Failed to write to transcoder: %s\n", strerror(errno));
00170       }
00171       if (count != res) {
00172          ast_log(LOG_ERROR, "Requested write of %zd bytes, but only wrote %d bytes.\n", count, res);
00173       }
00174    }
00175    p.fd = dahdip->fd;
00176    p.events = POLLOUT;
00177    res = poll(&p, 1, 50);
00178 }
00179 
00180 static int dahdi_encoder_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
00181 {
00182    struct codec_dahdi_pvt *dahdip = pvt->pvt;
00183 
00184    if (!f->subclass) {
00185       /* We're just faking a return for calculation purposes. */
00186       dahdip->fake = 2;
00187       pvt->samples = f->samples;
00188       return 0;
00189    }
00190 
00191    /* Buffer up the packets and send them to the hardware if we
00192     * have enough samples set up. */
00193    if (dahdip->softslin) {
00194       if (lintoulaw(pvt, f)) {
00195           return -1;
00196       }
00197    } else {
00198       /* NOTE:  If softslin support is not needed, and the sample
00199        * size is equal to the required sample size, we wouldn't
00200        * need this copy operation.  But at the time this was
00201        * written, only softslin is supported. */
00202       if (dahdip->samples_in_buffer + f->samples > sizeof(dahdip->ulaw_buffer)) {
00203          ast_log(LOG_ERROR, "Out of buffer space.\n");
00204          return -1;
00205       }
00206       memcpy(&dahdip->ulaw_buffer[dahdip->samples_in_buffer], f->data, f->samples);
00207       dahdip->samples_in_buffer += f->samples;
00208    }
00209 
00210    while (dahdip->samples_in_buffer > dahdip->required_samples) {
00211       dahdi_write_frame(dahdip, dahdip->ulaw_buffer, dahdip->required_samples);
00212       dahdip->samples_in_buffer -= dahdip->required_samples;
00213       if (dahdip->samples_in_buffer) {
00214          /* Shift any remaining bytes down. */
00215          memmove(dahdip->ulaw_buffer, &dahdip->ulaw_buffer[dahdip->required_samples],
00216             dahdip->samples_in_buffer);
00217       }
00218    }
00219    pvt->samples += f->samples;
00220    pvt->datalen = 0;
00221    return -1;
00222 }
00223 
00224 static struct ast_frame *dahdi_encoder_frameout(struct ast_trans_pvt *pvt)
00225 {
00226    struct codec_dahdi_pvt *dahdip = pvt->pvt;
00227    int res;
00228 
00229    if (2 == dahdip->fake) {
00230       dahdip->fake = 1;
00231       pvt->f.frametype = AST_FRAME_VOICE;
00232       pvt->f.subclass = 0;
00233       pvt->f.samples = dahdip->required_samples;
00234       pvt->f.data = NULL;
00235       pvt->f.offset = 0;
00236       pvt->f.datalen = 0;
00237       pvt->f.mallocd = 0;
00238       pvt->samples = 0;
00239 
00240       return ast_frisolate(&pvt->f);
00241 
00242    } else if (1 == dahdip->fake) {
00243       dahdip->fake = 0;
00244       return NULL;
00245    }
00246 
00247    res = read(dahdip->fd, pvt->outbuf + pvt->datalen, pvt->t->buf_size - pvt->datalen);
00248    if (-1 == res) {
00249       if (EWOULDBLOCK == errno) {
00250          /* Nothing waiting... */
00251          return NULL;
00252       } else {
00253          ast_log(LOG_ERROR, "Failed to read from transcoder: %s\n", strerror(errno));
00254          return NULL;
00255       }
00256    } else {
00257       pvt->f.datalen = res;
00258       pvt->f.samples = dahdip->required_samples;
00259       pvt->f.frametype = AST_FRAME_VOICE;
00260       pvt->f.subclass = 1 <<  (pvt->t->dstfmt);
00261       pvt->f.mallocd = 0;
00262       pvt->f.offset = AST_FRIENDLY_OFFSET;
00263       pvt->f.src = pvt->t->name;
00264       pvt->f.data = pvt->outbuf;
00265 
00266       pvt->samples = 0;
00267       pvt->datalen = 0;
00268       return ast_frisolate(&pvt->f);
00269    }
00270 
00271    /* Shouldn't get here... */
00272    return NULL;
00273 }
00274 
00275 static int dahdi_decoder_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
00276 {
00277    struct codec_dahdi_pvt *dahdip = pvt->pvt;
00278 
00279    if (!f->subclass) {
00280       /* We're just faking a return for calculation purposes. */
00281       dahdip->fake = 2;
00282       pvt->samples = f->samples;
00283       return 0;
00284    }
00285 
00286    if (!f->datalen) {
00287       if (f->samples != dahdip->required_samples) {
00288          ast_log(LOG_ERROR, "%d != %d %d\n", f->samples, dahdip->required_samples, f->datalen);
00289       }
00290    }
00291    dahdi_write_frame(dahdip, f->data, f->datalen);
00292    pvt->samples += f->samples;
00293    pvt->datalen = 0;
00294    return -1;
00295 }
00296 
00297 static struct ast_frame *dahdi_decoder_frameout(struct ast_trans_pvt *pvt)
00298 {
00299    int res;
00300    struct codec_dahdi_pvt *dahdip = pvt->pvt;
00301 
00302    if (2 == dahdip->fake) {
00303       dahdip->fake = 1;
00304       pvt->f.frametype = AST_FRAME_VOICE;
00305       pvt->f.subclass = 0;
00306       pvt->f.samples = dahdip->required_samples;
00307       pvt->f.data = NULL;
00308       pvt->f.offset = 0;
00309       pvt->f.datalen = 0;
00310       pvt->f.mallocd = 0;
00311       pvt->samples = 0;
00312       return ast_frisolate(&pvt->f);
00313    } else if (1 == dahdip->fake) {
00314       pvt->samples = 0;
00315       dahdip->fake = 0;
00316       return NULL;
00317    }
00318 
00319    /* Let's check to see if there is a new frame for us.... */
00320    if (dahdip->softslin) {
00321       res = read(dahdip->fd, dahdip->ulaw_buffer, sizeof(dahdip->ulaw_buffer));
00322    } else {
00323       res = read(dahdip->fd, pvt->outbuf + pvt->datalen, pvt->t->buf_size - pvt->datalen);
00324    }
00325 
00326    if (-1 == res) {
00327       if (EWOULDBLOCK == errno) {
00328          /* Nothing waiting... */
00329          return NULL;
00330       } else {
00331          ast_log(LOG_ERROR, "Failed to read from transcoder: %s\n", strerror(errno));
00332          return NULL;
00333       }
00334    } else {
00335       if (dahdip->softslin) {
00336          ulawtolin(pvt);
00337          pvt->f.datalen = res * 2;
00338       } else {
00339          pvt->f.datalen = res;
00340       }
00341       pvt->datalen = 0;
00342       pvt->f.frametype = AST_FRAME_VOICE;
00343       pvt->f.subclass = 1 <<  (pvt->t->dstfmt);
00344       pvt->f.mallocd = 0;
00345       pvt->f.offset = AST_FRIENDLY_OFFSET;
00346       pvt->f.src = pvt->t->name;
00347       pvt->f.data = pvt->outbuf;
00348       pvt->f.samples = dahdip->required_samples;
00349       pvt->samples = 0;
00350 
00351       return ast_frisolate(&pvt->f);
00352    }
00353 
00354    /* Shouldn't get here... */
00355    return NULL;
00356 }
00357 
00358 
00359 static void dahdi_destroy(struct ast_trans_pvt *pvt)
00360 {
00361    struct codec_dahdi_pvt *dahdip = pvt->pvt;
00362 
00363    switch (dahdip->fmts.dstfmt) {
00364    case AST_FORMAT_G729A:
00365    case AST_FORMAT_G723_1:
00366       ast_atomic_fetchadd_int(&channels.encoders, -1);
00367       break;
00368    default:
00369       ast_atomic_fetchadd_int(&channels.decoders, -1);
00370       break;
00371    }
00372 
00373    close(dahdip->fd);
00374 }
00375 
00376 static int dahdi_translate(struct ast_trans_pvt *pvt, int dest, int source)
00377 {
00378    /* Request translation through zap if possible */
00379    int fd;
00380    struct codec_dahdi_pvt *dahdip = pvt->pvt;
00381    int flags;
00382    int tried_once = 0;
00383    const char *dev_filename = "/dev/dahdi/transcode";
00384 
00385    if ((fd = open(dev_filename, O_RDWR)) < 0) {
00386       ast_log(LOG_ERROR, "Failed to open %s: %s\n", dev_filename, strerror(errno));
00387       return -1;
00388    }
00389 
00390    dahdip->fmts.srcfmt = (1 << source);
00391    dahdip->fmts.dstfmt = (1 << dest);
00392 
00393    ast_debug(1, "Opening transcoder channel from %d to %d.\n", source, dest);
00394 
00395 retry:
00396    if (ioctl(fd, DAHDI_TC_ALLOCATE, &dahdip->fmts)) {
00397       if ((ENODEV == errno) && !tried_once) {
00398          /* We requested to translate to/from an unsupported
00399           * format.  Most likely this is because signed linear
00400           * was not supported by any hardware devices even
00401           * though this module always registers signed linear
00402           * support. In this case we'll retry, requesting
00403           * support for ULAW instead of signed linear and then
00404           * we'll just convert from ulaw to signed linear in
00405           * software. */
00406          if (AST_FORMAT_SLINEAR == dahdip->fmts.srcfmt) {
00407             ast_debug(1, "Using soft_slin support on source\n");
00408             dahdip->softslin = 1;
00409             dahdip->fmts.srcfmt = AST_FORMAT_ULAW;
00410          } else if (AST_FORMAT_SLINEAR == dahdip->fmts.dstfmt) {
00411             ast_debug(1, "Using soft_slin support on destination\n");
00412             dahdip->softslin = 1;
00413             dahdip->fmts.dstfmt = AST_FORMAT_ULAW;
00414          }
00415          tried_once = 1;
00416          goto retry;
00417       }
00418       ast_log(LOG_ERROR, "Unable to attach to transcoder: %s\n", strerror(errno));
00419       close(fd);
00420 
00421       return -1;
00422    }
00423 
00424    flags = fcntl(fd, F_GETFL);
00425    if (flags > - 1) {
00426       if (fcntl(fd, F_SETFL, flags | O_NONBLOCK))
00427          ast_log(LOG_WARNING, "Could not set non-block mode!\n");
00428    }
00429 
00430    dahdip->fd = fd;
00431 
00432    dahdip->required_samples = ((dahdip->fmts.dstfmt|dahdip->fmts.srcfmt)&AST_FORMAT_G723_1) ? G723_SAMPLES : G729_SAMPLES;
00433 
00434    switch (dahdip->fmts.dstfmt) {
00435    case AST_FORMAT_G729A:
00436       ast_atomic_fetchadd_int(&channels.encoders, +1);
00437       break;
00438    case AST_FORMAT_G723_1:
00439       ast_atomic_fetchadd_int(&channels.encoders, +1);
00440       break;
00441    default:
00442       ast_atomic_fetchadd_int(&channels.decoders, +1);
00443       break;
00444    }
00445 
00446    return 0;
00447 }
00448 
00449 static int dahdi_new(struct ast_trans_pvt *pvt)
00450 {
00451    return dahdi_translate(pvt, pvt->t->dstfmt, pvt->t->srcfmt);
00452 }
00453 
00454 static struct ast_frame *fakesrc_sample(void)
00455 {
00456    /* Don't bother really trying to test hardware ones. */
00457    static struct ast_frame f = {
00458       .frametype = AST_FRAME_VOICE,
00459       .samples = 160,
00460       .src = __PRETTY_FUNCTION__
00461    };
00462 
00463    return &f;
00464 }
00465 
00466 static int is_encoder(struct translator *zt)
00467 {
00468    if (zt->t.srcfmt&(AST_FORMAT_ULAW|AST_FORMAT_ALAW|AST_FORMAT_SLINEAR)) {
00469       return 1;
00470    } else {
00471       return 0;
00472    }
00473 }
00474 
00475 static int register_translator(int dst, int src)
00476 {
00477    struct translator *zt;
00478    int res;
00479 
00480    if (!(zt = ast_calloc(1, sizeof(*zt)))) {
00481       return -1;
00482    }
00483 
00484    snprintf((char *) (zt->t.name), sizeof(zt->t.name), "zap%sto%s",
00485        ast_getformatname((1 << src)), ast_getformatname((1 << dst)));
00486    zt->t.srcfmt = (1 << src);
00487    zt->t.dstfmt = (1 << dst);
00488    zt->t.buf_size = BUFFER_SIZE;
00489    if (is_encoder(zt)) {
00490       zt->t.framein = dahdi_encoder_framein;
00491       zt->t.frameout = dahdi_encoder_frameout;
00492 #if 0
00493       zt->t.buffer_samples = 0;
00494 #endif
00495    } else {
00496       zt->t.framein = dahdi_decoder_framein;
00497       zt->t.frameout = dahdi_decoder_frameout;
00498 #if 0
00499       if (AST_FORMAT_G723_1 == zt->t.srcfmt) {
00500          zt->t.plc_samples = G723_SAMPLES;
00501       } else {
00502          zt->t.plc_samples = G729_SAMPLES;
00503       }
00504       zt->t.buffer_samples = zt->t.plc_samples * 8;
00505 #endif
00506    }
00507    zt->t.destroy = dahdi_destroy;
00508    zt->t.buffer_samples = 0;
00509    zt->t.newpvt = dahdi_new;
00510    zt->t.sample = fakesrc_sample;
00511 #if 0
00512    zt->t.useplc = global_useplc;
00513 #endif
00514    zt->t.useplc = 0;
00515    zt->t.native_plc = 0;
00516 
00517    zt->t.desc_size = sizeof(struct codec_dahdi_pvt);
00518    if ((res = ast_register_translator(&zt->t))) {
00519       ast_free(zt);
00520       return -1;
00521    }
00522 
00523    AST_LIST_LOCK(&translators);
00524    AST_LIST_INSERT_HEAD(&translators, zt, entry);
00525    AST_LIST_UNLOCK(&translators);
00526 
00527    global_format_map.map[dst][src] = 1;
00528 
00529    return res;
00530 }
00531 
00532 static void drop_translator(int dst, int src)
00533 {
00534    struct translator *cur;
00535 
00536    AST_LIST_LOCK(&translators);
00537    AST_LIST_TRAVERSE_SAFE_BEGIN(&translators, cur, entry) {
00538       if (cur->t.srcfmt != src)
00539          continue;
00540 
00541       if (cur->t.dstfmt != dst)
00542          continue;
00543 
00544       AST_LIST_REMOVE_CURRENT(entry);
00545       ast_unregister_translator(&cur->t);
00546       ast_free(cur);
00547       global_format_map.map[dst][src] = 0;
00548       break;
00549    }
00550    AST_LIST_TRAVERSE_SAFE_END;
00551    AST_LIST_UNLOCK(&translators);
00552 }
00553 
00554 static void unregister_translators(void)
00555 {
00556    struct translator *cur;
00557 
00558    AST_LIST_LOCK(&translators);
00559    while ((cur = AST_LIST_REMOVE_HEAD(&translators, entry))) {
00560       ast_unregister_translator(&cur->t);
00561       ast_free(cur);
00562    }
00563    AST_LIST_UNLOCK(&translators);
00564 }
00565 
00566 static int parse_config(int reload)
00567 {
00568    struct ast_variable *var;
00569    struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };
00570    struct ast_config *cfg = ast_config_load("codecs.conf", config_flags);
00571 
00572    if (cfg == NULL)
00573       return 0;
00574    if (cfg == CONFIG_STATUS_FILEUNCHANGED)
00575       return 0;
00576 
00577    for (var = ast_variable_browse(cfg, "plc"); var; var = var->next) {
00578           if (!strcasecmp(var->name, "genericplc")) {
00579              global_useplc = ast_true(var->value);
00580              ast_verb(3, "codec_dahdi: %susing generic PLC\n",
00581             global_useplc ? "" : "not ");
00582           }
00583    }
00584 
00585    ast_config_destroy(cfg);
00586    return 0;
00587 }
00588 
00589 static void build_translators(struct format_map *map, unsigned int dstfmts, unsigned int srcfmts)
00590 {
00591    unsigned int src, dst;
00592 
00593    for (src = 0; src < 32; src++) {
00594       for (dst = 0; dst < 32; dst++) {
00595          if (!(srcfmts & (1 << src)))
00596             continue;
00597 
00598          if (!(dstfmts & (1 << dst)))
00599             continue;
00600 
00601          if (global_format_map.map[dst][src])
00602             continue;
00603 
00604          if (!register_translator(dst, src))
00605             map->map[dst][src] = 1;
00606       }
00607    }
00608 }
00609 
00610 static int find_transcoders(void)
00611 {
00612    struct dahdi_transcoder_info info = { 0, };
00613    struct format_map map = { { { 0 } } };
00614    int fd, res;
00615    unsigned int x, y;
00616 
00617    if ((fd = open("/dev/dahdi/transcode", O_RDWR)) < 0) {
00618       ast_log(LOG_ERROR, "Failed to open /dev/dahdi/transcode: %s\n", strerror(errno));
00619       return 0;
00620    }
00621 
00622    for (info.tcnum = 0; !(res = ioctl(fd, DAHDI_TC_GETINFO, &info)); info.tcnum++) {
00623       if (option_verbose > 1)
00624          ast_verbose(VERBOSE_PREFIX_2 "Found transcoder '%s'.\n", info.name);
00625 
00626       /* Complex codecs need to support signed linear.  If the
00627        * hardware transcoder does not natively support signed linear
00628        * format, we will emulate it in software directly in this
00629        * module. Also, do not allow direct ulaw/alaw to complex
00630        * codec translation, since that will prevent the generic PLC
00631        * functions from working. */
00632       if (info.dstfmts & (AST_FORMAT_ULAW | AST_FORMAT_ALAW)) {
00633          info.dstfmts |= AST_FORMAT_SLINEAR;
00634          info.dstfmts &= ~(AST_FORMAT_ULAW | AST_FORMAT_ALAW);
00635       }
00636       if (info.srcfmts & (AST_FORMAT_ULAW | AST_FORMAT_ALAW)) {
00637          info.srcfmts |= AST_FORMAT_SLINEAR;
00638          info.srcfmts &= ~(AST_FORMAT_ULAW | AST_FORMAT_ALAW);
00639       }
00640 
00641       build_translators(&map, info.dstfmts, info.srcfmts);
00642       ast_atomic_fetchadd_int(&channels.total, info.numchannels / 2);
00643 
00644    }
00645 
00646    close(fd);
00647 
00648    if (!info.tcnum && (option_verbose > 1))
00649       ast_verbose(VERBOSE_PREFIX_2 "No hardware transcoders found.\n");
00650 
00651    for (x = 0; x < 32; x++) {
00652       for (y = 0; y < 32; y++) {
00653          if (!map.map[x][y] && global_format_map.map[x][y])
00654             drop_translator(x, y);
00655       }
00656    }
00657 
00658    return 0;
00659 }
00660 
00661 static int reload(void)
00662 {
00663    struct translator *cur;
00664 
00665    if (parse_config(1))
00666       return AST_MODULE_LOAD_DECLINE;
00667 
00668    AST_LIST_LOCK(&translators);
00669    AST_LIST_TRAVERSE(&translators, cur, entry)
00670       cur->t.useplc = global_useplc;
00671    AST_LIST_UNLOCK(&translators);
00672 
00673    return AST_MODULE_LOAD_SUCCESS;
00674 }
00675 
00676 static int unload_module(void)
00677 {
00678    ast_cli_unregister_multiple(cli, ARRAY_LEN(cli));
00679    unregister_translators();
00680 
00681    return 0;
00682 }
00683 
00684 static int load_module(void)
00685 {
00686    ast_ulaw_init();
00687    if (parse_config(0))
00688       return AST_MODULE_LOAD_DECLINE;
00689    find_transcoders();
00690    ast_cli_register_multiple(cli, ARRAY_LEN(cli));
00691    return AST_MODULE_LOAD_SUCCESS;
00692 }
00693 
00694 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "Generic DAHDI Transcoder Codec Translator",
00695       .load = load_module,
00696       .unload = unload_module,
00697       .reload = reload,
00698           );

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