Wed Oct 28 11:51:02 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: 224935 $")
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 #ifdef DEBUG_TRANSCODE
00089    int totalms;
00090    int lasttotalms;
00091 #endif
00092    struct dahdi_transcoder_formats fmts;
00093    unsigned int softslin:1;
00094    unsigned int fake:2;
00095    uint16_t required_samples;
00096    uint16_t samples_in_buffer;
00097    uint8_t ulaw_buffer[1024];
00098 };
00099 
00100 /* Only used by a decoder */
00101 static int ulawtolin(struct ast_trans_pvt *pvt)
00102 {
00103    struct codec_dahdi_pvt *dahdip = pvt->pvt;
00104    int i = dahdip->required_samples;
00105    uint8_t *src = &dahdip->ulaw_buffer[0];
00106    int16_t *dst = pvt->outbuf.i16 + pvt->datalen;
00107 
00108    /* convert and copy in outbuf */
00109    while (i--) {
00110       *dst++ = AST_MULAW(*src++);
00111    }
00112 
00113    return 0;
00114 }
00115 
00116 /* Only used by an encoder. */
00117 static int lintoulaw(struct ast_trans_pvt *pvt, struct ast_frame *f)
00118 {
00119    struct codec_dahdi_pvt *dahdip = pvt->pvt;
00120    int i = f->samples;
00121    uint8_t *dst = &dahdip->ulaw_buffer[dahdip->samples_in_buffer];
00122    int16_t *src = f->data.ptr;
00123 
00124    if (dahdip->samples_in_buffer + i > sizeof(dahdip->ulaw_buffer)) {
00125       ast_log(LOG_ERROR, "Out of buffer space!\n");
00126       return -i;
00127    }
00128 
00129    while (i--) {
00130       *dst++ = AST_LIN2MU(*src++);
00131    }
00132 
00133    dahdip->samples_in_buffer += f->samples;
00134    return 0;
00135 }
00136 
00137 static char *handle_cli_transcoder_show(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00138 {
00139    struct channel_usage copy;
00140 
00141    switch (cmd) {
00142    case CLI_INIT:
00143       e->command = "transcoder show";
00144       e->usage =
00145          "Usage: transcoder show\n"
00146          "       Displays channel utilization of DAHDI transcoder(s).\n";
00147       return NULL;
00148    case CLI_GENERATE:
00149       return NULL;
00150    }
00151 
00152    if (a->argc != 2)
00153       return CLI_SHOWUSAGE;
00154 
00155    copy = channels;
00156 
00157    if (copy.total == 0)
00158       ast_cli(a->fd, "No DAHDI transcoders found.\n");
00159    else
00160       ast_cli(a->fd, "%d/%d encoders/decoders of %d channels are in use.\n", copy.encoders, copy.decoders, copy.total);
00161 
00162    return CLI_SUCCESS;
00163 }
00164 
00165 static void dahdi_write_frame(struct codec_dahdi_pvt *dahdip, const uint8_t *buffer, const ssize_t count)
00166 {
00167    int res;
00168    struct pollfd p = {0};
00169    if (!count) return;
00170    res = write(dahdip->fd, buffer, count);
00171    if (option_verbose > 10) {
00172       if (-1 == res) {
00173          ast_log(LOG_ERROR, "Failed to write to transcoder: %s\n", strerror(errno));
00174       }
00175       if (count != res) {
00176          ast_log(LOG_ERROR, "Requested write of %zd bytes, but only wrote %d bytes.\n", count, res);
00177       }
00178    }
00179    p.fd = dahdip->fd;
00180    p.events = POLLOUT;
00181    res = poll(&p, 1, 50);
00182 }
00183 
00184 static int dahdi_encoder_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
00185 {
00186    struct codec_dahdi_pvt *dahdip = pvt->pvt;
00187 
00188    if (!f->subclass) {
00189       /* We're just faking a return for calculation purposes. */
00190       dahdip->fake = 2;
00191       pvt->samples = f->samples;
00192       return 0;
00193    }
00194 
00195    /* Buffer up the packets and send them to the hardware if we
00196     * have enough samples set up. */
00197    if (dahdip->softslin) {
00198       if (lintoulaw(pvt, f)) {
00199           return -1;
00200       }
00201    } else {
00202       /* NOTE:  If softslin support is not needed, and the sample
00203        * size is equal to the required sample size, we wouldn't
00204        * need this copy operation.  But at the time this was
00205        * written, only softslin is supported. */
00206       if (dahdip->samples_in_buffer + f->samples > sizeof(dahdip->ulaw_buffer)) {
00207          ast_log(LOG_ERROR, "Out of buffer space.\n");
00208          return -1;
00209       }
00210       memcpy(&dahdip->ulaw_buffer[dahdip->samples_in_buffer], f->data.ptr, f->samples);
00211       dahdip->samples_in_buffer += f->samples;
00212    }
00213 
00214    while (dahdip->samples_in_buffer > dahdip->required_samples) {
00215       dahdi_write_frame(dahdip, dahdip->ulaw_buffer, dahdip->required_samples);
00216       dahdip->samples_in_buffer -= dahdip->required_samples;
00217       if (dahdip->samples_in_buffer) {
00218          /* Shift any remaining bytes down. */
00219          memmove(dahdip->ulaw_buffer, &dahdip->ulaw_buffer[dahdip->required_samples],
00220             dahdip->samples_in_buffer);
00221       }
00222    }
00223    pvt->samples += f->samples;
00224    pvt->datalen = 0;
00225    return -1;
00226 }
00227 
00228 static struct ast_frame *dahdi_encoder_frameout(struct ast_trans_pvt *pvt)
00229 {
00230    struct codec_dahdi_pvt *dahdip = pvt->pvt;
00231    int res;
00232 
00233    if (2 == dahdip->fake) {
00234       dahdip->fake = 1;
00235       pvt->f.frametype = AST_FRAME_VOICE;
00236       pvt->f.subclass = 0;
00237       pvt->f.samples = dahdip->required_samples;
00238       pvt->f.data.ptr = NULL;
00239       pvt->f.offset = 0;
00240       pvt->f.datalen = 0;
00241       pvt->f.mallocd = 0;
00242       pvt->samples = 0;
00243 
00244       return ast_frisolate(&pvt->f);
00245 
00246    } else if (1 == dahdip->fake) {
00247       dahdip->fake = 0;
00248       return NULL;
00249    }
00250 
00251    res = read(dahdip->fd, pvt->outbuf.c + pvt->datalen, pvt->t->buf_size - pvt->datalen);
00252    if (-1 == res) {
00253       if (EWOULDBLOCK == errno) {
00254          /* Nothing waiting... */
00255          return NULL;
00256       } else {
00257          ast_log(LOG_ERROR, "Failed to read from transcoder: %s\n", strerror(errno));
00258          return NULL;
00259       }
00260    } else {
00261       pvt->f.datalen = res;
00262       pvt->f.samples = dahdip->required_samples;
00263       pvt->f.frametype = AST_FRAME_VOICE;
00264       pvt->f.subclass = 1 <<  (pvt->t->dstfmt);
00265       pvt->f.mallocd = 0;
00266       pvt->f.offset = AST_FRIENDLY_OFFSET;
00267       pvt->f.src = pvt->t->name;
00268       pvt->f.data.ptr = pvt->outbuf.c;
00269 
00270       pvt->samples = 0;
00271       pvt->datalen = 0;
00272       return ast_frisolate(&pvt->f);
00273    }
00274 
00275    /* Shouldn't get here... */
00276    return NULL;
00277 }
00278 
00279 static int dahdi_decoder_framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
00280 {
00281    struct codec_dahdi_pvt *dahdip = pvt->pvt;
00282 
00283    if (!f->subclass) {
00284       /* We're just faking a return for calculation purposes. */
00285       dahdip->fake = 2;
00286       pvt->samples = f->samples;
00287       return 0;
00288    }
00289 
00290    if (!f->datalen) {
00291       if (f->samples != dahdip->required_samples) {
00292          ast_log(LOG_ERROR, "%d != %d %d\n", f->samples, dahdip->required_samples, f->datalen);
00293       }
00294    }
00295    dahdi_write_frame(dahdip, f->data.ptr, f->datalen);
00296    pvt->samples += f->samples;
00297    pvt->datalen = 0;
00298    return -1;
00299 }
00300 
00301 static struct ast_frame *dahdi_decoder_frameout(struct ast_trans_pvt *pvt)
00302 {
00303    int res;
00304    struct codec_dahdi_pvt *dahdip = pvt->pvt;
00305 
00306    if (2 == dahdip->fake) {
00307       dahdip->fake = 1;
00308       pvt->f.frametype = AST_FRAME_VOICE;
00309       pvt->f.subclass = 0;
00310       pvt->f.samples = dahdip->required_samples;
00311       pvt->f.data.ptr = NULL;
00312       pvt->f.offset = 0;
00313       pvt->f.datalen = 0;
00314       pvt->f.mallocd = 0;
00315       pvt->samples = 0;
00316       return ast_frisolate(&pvt->f);
00317    } else if (1 == dahdip->fake) {
00318       pvt->samples = 0;
00319       dahdip->fake = 0;
00320       return NULL;
00321    }
00322 
00323    /* Let's check to see if there is a new frame for us.... */
00324    if (dahdip->softslin) {
00325       res = read(dahdip->fd, dahdip->ulaw_buffer, sizeof(dahdip->ulaw_buffer));
00326    } else {
00327       res = read(dahdip->fd, pvt->outbuf.c + pvt->datalen, pvt->t->buf_size - pvt->datalen);
00328    }
00329 
00330    if (-1 == res) {
00331       if (EWOULDBLOCK == errno) {
00332          /* Nothing waiting... */
00333          return NULL;
00334       } else {
00335          ast_log(LOG_ERROR, "Failed to read from transcoder: %s\n", strerror(errno));
00336          return NULL;
00337       }
00338    } else {
00339       if (dahdip->softslin) {
00340          ulawtolin(pvt);
00341          pvt->f.datalen = res * 2;
00342       } else {
00343          pvt->f.datalen = res;
00344       }
00345       pvt->datalen = 0;
00346       pvt->f.frametype = AST_FRAME_VOICE;
00347       pvt->f.subclass = 1 <<  (pvt->t->dstfmt);
00348       pvt->f.mallocd = 0;
00349       pvt->f.offset = AST_FRIENDLY_OFFSET;
00350       pvt->f.src = pvt->t->name;
00351       pvt->f.data.ptr = pvt->outbuf.c;
00352       pvt->f.samples = dahdip->required_samples;
00353       pvt->samples = 0;
00354 
00355       return ast_frisolate(&pvt->f);
00356    }
00357 
00358    /* Shouldn't get here... */
00359    return NULL;
00360 }
00361 
00362 
00363 static void dahdi_destroy(struct ast_trans_pvt *pvt)
00364 {
00365    struct codec_dahdi_pvt *dahdip = pvt->pvt;
00366 
00367    switch (dahdip->fmts.dstfmt) {
00368    case AST_FORMAT_G729A:
00369    case AST_FORMAT_G723_1:
00370       ast_atomic_fetchadd_int(&channels.encoders, -1);
00371       break;
00372    default:
00373       ast_atomic_fetchadd_int(&channels.decoders, -1);
00374       break;
00375    }
00376 
00377    close(dahdip->fd);
00378 }
00379 
00380 static int dahdi_translate(struct ast_trans_pvt *pvt, int dest, int source)
00381 {
00382    /* Request translation through zap if possible */
00383    int fd;
00384    struct codec_dahdi_pvt *dahdip = pvt->pvt;
00385    int flags;
00386    int tried_once = 0;
00387    const char *dev_filename = "/dev/dahdi/transcode";
00388 
00389    if ((fd = open(dev_filename, O_RDWR)) < 0) {
00390       ast_log(LOG_ERROR, "Failed to open %s: %s\n", dev_filename, strerror(errno));
00391       return -1;
00392    }
00393 
00394    dahdip->fmts.srcfmt = (1 << source);
00395    dahdip->fmts.dstfmt = (1 << dest);
00396 
00397    ast_debug(1, "Opening transcoder channel from %d to %d.\n", source, dest);
00398 
00399 retry:
00400    if (ioctl(fd, DAHDI_TC_ALLOCATE, &dahdip->fmts)) {
00401       if ((ENODEV == errno) && !tried_once) {
00402          /* We requested to translate to/from an unsupported
00403           * format.  Most likely this is because signed linear
00404           * was not supported by any hardware devices even
00405           * though this module always registers signed linear
00406           * support. In this case we'll retry, requesting
00407           * support for ULAW instead of signed linear and then
00408           * we'll just convert from ulaw to signed linear in
00409           * software. */
00410          if (AST_FORMAT_SLINEAR == dahdip->fmts.srcfmt) {
00411             ast_debug(1, "Using soft_slin support on source\n");
00412             dahdip->softslin = 1;
00413             dahdip->fmts.srcfmt = AST_FORMAT_ULAW;
00414          } else if (AST_FORMAT_SLINEAR == dahdip->fmts.dstfmt) {
00415             ast_debug(1, "Using soft_slin support on destination\n");
00416             dahdip->softslin = 1;
00417             dahdip->fmts.dstfmt = AST_FORMAT_ULAW;
00418          }
00419          tried_once = 1;
00420          goto retry;
00421       }
00422       ast_log(LOG_ERROR, "Unable to attach to transcoder: %s\n", strerror(errno));
00423       close(fd);
00424 
00425       return -1;
00426    }
00427 
00428    flags = fcntl(fd, F_GETFL);
00429    if (flags > - 1) {
00430       if (fcntl(fd, F_SETFL, flags | O_NONBLOCK))
00431          ast_log(LOG_WARNING, "Could not set non-block mode!\n");
00432    }
00433 
00434    dahdip->fd = fd;
00435 
00436    dahdip->required_samples = ((dahdip->fmts.dstfmt|dahdip->fmts.srcfmt)&AST_FORMAT_G723_1) ? G723_SAMPLES : G729_SAMPLES;
00437 
00438    switch (dahdip->fmts.dstfmt) {
00439    case AST_FORMAT_G729A:
00440       ast_atomic_fetchadd_int(&channels.encoders, +1);
00441       break;
00442    case AST_FORMAT_G723_1:
00443       ast_atomic_fetchadd_int(&channels.encoders, +1);
00444       break;
00445    default:
00446       ast_atomic_fetchadd_int(&channels.decoders, +1);
00447       break;
00448    }
00449 
00450    return 0;
00451 }
00452 
00453 static int dahdi_new(struct ast_trans_pvt *pvt)
00454 {
00455    return dahdi_translate(pvt, pvt->t->dstfmt, pvt->t->srcfmt);
00456 }
00457 
00458 static struct ast_frame *fakesrc_sample(void)
00459 {
00460    /* Don't bother really trying to test hardware ones. */
00461    static struct ast_frame f = {
00462       .frametype = AST_FRAME_VOICE,
00463       .samples = 160,
00464       .src = __PRETTY_FUNCTION__
00465    };
00466 
00467    return &f;
00468 }
00469 
00470 static int is_encoder(struct translator *zt)
00471 {
00472    if (zt->t.srcfmt&(AST_FORMAT_ULAW|AST_FORMAT_ALAW|AST_FORMAT_SLINEAR)) {
00473       return 1;
00474    } else {
00475       return 0;
00476    }
00477 }
00478 
00479 static int register_translator(int dst, int src)
00480 {
00481    struct translator *zt;
00482    int res;
00483 
00484    if (!(zt = ast_calloc(1, sizeof(*zt)))) {
00485       return -1;
00486    }
00487 
00488    snprintf((char *) (zt->t.name), sizeof(zt->t.name), "zap%sto%s",
00489        ast_getformatname((1 << src)), ast_getformatname((1 << dst)));
00490    zt->t.srcfmt = (1 << src);
00491    zt->t.dstfmt = (1 << dst);
00492    zt->t.buf_size = BUFFER_SIZE;
00493    if (is_encoder(zt)) {
00494       zt->t.framein = dahdi_encoder_framein;
00495       zt->t.frameout = dahdi_encoder_frameout;
00496 #if 0
00497       zt->t.buffer_samples = 0;
00498 #endif
00499    } else {
00500       zt->t.framein = dahdi_decoder_framein;
00501       zt->t.frameout = dahdi_decoder_frameout;
00502 #if 0
00503       if (AST_FORMAT_G723_1 == zt->t.srcfmt) {
00504          zt->t.plc_samples = G723_SAMPLES;
00505       } else {
00506          zt->t.plc_samples = G729_SAMPLES;
00507       }
00508       zt->t.buffer_samples = zt->t.plc_samples * 8;
00509 #endif
00510    }
00511    zt->t.destroy = dahdi_destroy;
00512    zt->t.buffer_samples = 0;
00513    zt->t.newpvt = dahdi_new;
00514    zt->t.sample = fakesrc_sample;
00515 #if 0
00516    zt->t.useplc = global_useplc;
00517 #endif
00518    zt->t.useplc = 0;
00519    zt->t.native_plc = 0;
00520 
00521    zt->t.desc_size = sizeof(struct codec_dahdi_pvt);
00522    if ((res = ast_register_translator(&zt->t))) {
00523       ast_free(zt);
00524       return -1;
00525    }
00526 
00527    AST_LIST_LOCK(&translators);
00528    AST_LIST_INSERT_HEAD(&translators, zt, entry);
00529    AST_LIST_UNLOCK(&translators);
00530 
00531    global_format_map.map[dst][src] = 1;
00532 
00533    return res;
00534 }
00535 
00536 static void drop_translator(int dst, int src)
00537 {
00538    struct translator *cur;
00539 
00540    AST_LIST_LOCK(&translators);
00541    AST_LIST_TRAVERSE_SAFE_BEGIN(&translators, cur, entry) {
00542       if (cur->t.srcfmt != src)
00543          continue;
00544 
00545       if (cur->t.dstfmt != dst)
00546          continue;
00547 
00548       AST_LIST_REMOVE_CURRENT(entry);
00549       ast_unregister_translator(&cur->t);
00550       ast_free(cur);
00551       global_format_map.map[dst][src] = 0;
00552       break;
00553    }
00554    AST_LIST_TRAVERSE_SAFE_END;
00555    AST_LIST_UNLOCK(&translators);
00556 }
00557 
00558 static void unregister_translators(void)
00559 {
00560    struct translator *cur;
00561 
00562    AST_LIST_LOCK(&translators);
00563    while ((cur = AST_LIST_REMOVE_HEAD(&translators, entry))) {
00564       ast_unregister_translator(&cur->t);
00565       ast_free(cur);
00566    }
00567    AST_LIST_UNLOCK(&translators);
00568 }
00569 
00570 static int parse_config(int reload)
00571 {
00572    struct ast_variable *var;
00573    struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };
00574    struct ast_config *cfg = ast_config_load("codecs.conf", config_flags);
00575 
00576    if (cfg == NULL)
00577       return 0;
00578    if (cfg == CONFIG_STATUS_FILEUNCHANGED)
00579       return 0;
00580 
00581    for (var = ast_variable_browse(cfg, "plc"); var; var = var->next) {
00582           if (!strcasecmp(var->name, "genericplc")) {
00583              global_useplc = ast_true(var->value);
00584              ast_verb(3, "codec_dahdi: %susing generic PLC\n",
00585             global_useplc ? "" : "not ");
00586           }
00587    }
00588 
00589    ast_config_destroy(cfg);
00590    return 0;
00591 }
00592 
00593 static void build_translators(struct format_map *map, unsigned int dstfmts, unsigned int srcfmts)
00594 {
00595    unsigned int src, dst;
00596 
00597    for (src = 0; src < 32; src++) {
00598       for (dst = 0; dst < 32; dst++) {
00599          if (!(srcfmts & (1 << src)))
00600             continue;
00601 
00602          if (!(dstfmts & (1 << dst)))
00603             continue;
00604 
00605          if (global_format_map.map[dst][src])
00606             continue;
00607 
00608          if (!register_translator(dst, src))
00609             map->map[dst][src] = 1;
00610       }
00611    }
00612 }
00613 
00614 static int find_transcoders(void)
00615 {
00616    struct dahdi_transcoder_info info = { 0, };
00617    struct format_map map = { { { 0 } } };
00618    int fd, res;
00619    unsigned int x, y;
00620 
00621    if ((fd = open("/dev/dahdi/transcode", O_RDWR)) < 0) {
00622       ast_log(LOG_ERROR, "Failed to open /dev/dahdi/transcode: %s\n", strerror(errno));
00623       return 0;
00624    }
00625 
00626    for (info.tcnum = 0; !(res = ioctl(fd, DAHDI_TC_GETINFO, &info)); info.tcnum++) {
00627       if (option_verbose > 1)
00628          ast_verbose(VERBOSE_PREFIX_2 "Found transcoder '%s'.\n", info.name);
00629 
00630       /* Complex codecs need to support signed linear.  If the
00631        * hardware transcoder does not natively support signed linear
00632        * format, we will emulate it in software directly in this
00633        * module. Also, do not allow direct ulaw/alaw to complex
00634        * codec translation, since that will prevent the generic PLC
00635        * functions from working. */
00636       if (info.dstfmts & (AST_FORMAT_ULAW | AST_FORMAT_ALAW)) {
00637          info.dstfmts |= AST_FORMAT_SLINEAR;
00638          info.dstfmts &= ~(AST_FORMAT_ULAW | AST_FORMAT_ALAW);
00639       }
00640       if (info.srcfmts & (AST_FORMAT_ULAW | AST_FORMAT_ALAW)) {
00641          info.srcfmts |= AST_FORMAT_SLINEAR;
00642          info.srcfmts &= ~(AST_FORMAT_ULAW | AST_FORMAT_ALAW);
00643       }
00644 
00645       build_translators(&map, info.dstfmts, info.srcfmts);
00646       ast_atomic_fetchadd_int(&channels.total, info.numchannels / 2);
00647 
00648    }
00649 
00650    close(fd);
00651 
00652    if (!info.tcnum && (option_verbose > 1))
00653       ast_verbose(VERBOSE_PREFIX_2 "No hardware transcoders found.\n");
00654 
00655    for (x = 0; x < 32; x++) {
00656       for (y = 0; y < 32; y++) {
00657          if (!map.map[x][y] && global_format_map.map[x][y])
00658             drop_translator(x, y);
00659       }
00660    }
00661 
00662    return 0;
00663 }
00664 
00665 static int reload(void)
00666 {
00667    struct translator *cur;
00668 
00669    if (parse_config(1))
00670       return AST_MODULE_LOAD_DECLINE;
00671 
00672    AST_LIST_LOCK(&translators);
00673    AST_LIST_TRAVERSE(&translators, cur, entry)
00674       cur->t.useplc = global_useplc;
00675    AST_LIST_UNLOCK(&translators);
00676 
00677    return AST_MODULE_LOAD_SUCCESS;
00678 }
00679 
00680 static int unload_module(void)
00681 {
00682    ast_cli_unregister_multiple(cli, ARRAY_LEN(cli));
00683    unregister_translators();
00684 
00685    return 0;
00686 }
00687 
00688 static int load_module(void)
00689 {
00690    ast_ulaw_init();
00691    if (parse_config(0))
00692       return AST_MODULE_LOAD_DECLINE;
00693    find_transcoders();
00694    ast_cli_register_multiple(cli, ARRAY_LEN(cli));
00695    return AST_MODULE_LOAD_SUCCESS;
00696 }
00697 
00698 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "Generic DAHDI Transcoder Codec Translator",
00699       .load = load_module,
00700       .unload = unload_module,
00701       .reload = reload,
00702           );

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