Fri Aug 24 02:22:12 2007

Asterisk developer's documentation


chan_alsa.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 1999 - 2005, Digium, Inc.
00005  *
00006  * By Matthew Fredrickson <creslin@digium.com>
00007  *
00008  * See http://www.asterisk.org for more information about
00009  * the Asterisk project. Please do not directly contact
00010  * any of the maintainers of this project for assistance;
00011  * the project provides a web site, mailing lists and IRC
00012  * channels for your use.
00013  *
00014  * This program is free software, distributed under the terms of
00015  * the GNU General Public License Version 2. See the LICENSE file
00016  * at the top of the source tree.
00017  */
00018 
00019 /*! \file 
00020  * \brief ALSA sound card channel driver 
00021  *
00022  * \author Matthew Fredrickson <creslin@digium.com>
00023  *
00024  * \par See also
00025  * \arg Config_alsa
00026  *
00027  * \ingroup channel_drivers
00028  */
00029 
00030 /*** MODULEINFO
00031    <depend>asound</depend>
00032  ***/
00033 
00034 #include "asterisk.h"
00035 
00036 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
00037 
00038 #include <unistd.h>
00039 #include <fcntl.h>
00040 #include <errno.h>
00041 #include <sys/ioctl.h>
00042 #include <sys/time.h>
00043 #include <string.h>
00044 #include <stdlib.h>
00045 #include <stdio.h>
00046 
00047 #define ALSA_PCM_NEW_HW_PARAMS_API
00048 #define ALSA_PCM_NEW_SW_PARAMS_API
00049 #include <alsa/asoundlib.h>
00050 
00051 #include "asterisk/frame.h"
00052 #include "asterisk/logger.h"
00053 #include "asterisk/channel.h"
00054 #include "asterisk/module.h"
00055 #include "asterisk/options.h"
00056 #include "asterisk/pbx.h"
00057 #include "asterisk/config.h"
00058 #include "asterisk/cli.h"
00059 #include "asterisk/utils.h"
00060 #include "asterisk/causes.h"
00061 #include "asterisk/endian.h"
00062 #include "asterisk/stringfields.h"
00063 #include "asterisk/abstract_jb.h"
00064 #include "asterisk/musiconhold.h"
00065 
00066 #include "busy.h"
00067 #include "ringtone.h"
00068 #include "ring10.h"
00069 #include "answer.h"
00070 
00071 #ifdef ALSA_MONITOR
00072 #include "alsa-monitor.h"
00073 #endif
00074 
00075 /*! Global jitterbuffer configuration - by default, jb is disabled */
00076 static struct ast_jb_conf default_jbconf = {
00077    .flags = 0,
00078    .max_size = -1,
00079    .resync_threshold = -1,
00080    .impl = ""
00081 };
00082 static struct ast_jb_conf global_jbconf;
00083 
00084 #define DEBUG 0
00085 /* Which device to use */
00086 #define ALSA_INDEV "default"
00087 #define ALSA_OUTDEV "default"
00088 #define DESIRED_RATE 8000
00089 
00090 /* Lets use 160 sample frames, just like GSM.  */
00091 #define FRAME_SIZE 160
00092 #define PERIOD_FRAMES 80      /* 80 Frames, at 2 bytes each */
00093 
00094 /* When you set the frame size, you have to come up with
00095    the right buffer format as well. */
00096 /* 5 64-byte frames = one frame */
00097 #define BUFFER_FMT ((buffersize * 10) << 16) | (0x0006);
00098 
00099 /* Don't switch between read/write modes faster than every 300 ms */
00100 #define MIN_SWITCH_TIME 600
00101 
00102 #if __BYTE_ORDER == __LITTLE_ENDIAN
00103 static snd_pcm_format_t format = SND_PCM_FORMAT_S16_LE;
00104 #else
00105 static snd_pcm_format_t format = SND_PCM_FORMAT_S16_BE;
00106 #endif
00107 
00108 /* static int block = O_NONBLOCK; */
00109 static char indevname[50] = ALSA_INDEV;
00110 static char outdevname[50] = ALSA_OUTDEV;
00111 
00112 #if 0
00113 static struct timeval lasttime;
00114 #endif
00115 
00116 static int silencesuppression = 0;
00117 static int silencethreshold = 1000;
00118 
00119 AST_MUTEX_DEFINE_STATIC(alsalock);
00120 
00121 static const char tdesc[] = "ALSA Console Channel Driver";
00122 static const char config[] = "alsa.conf";
00123 
00124 static char context[AST_MAX_CONTEXT] = "default";
00125 static char language[MAX_LANGUAGE] = "";
00126 static char exten[AST_MAX_EXTENSION] = "s";
00127 static char mohinterpret[MAX_MUSICCLASS];
00128 
00129 static int hookstate = 0;
00130 
00131 static short silence[FRAME_SIZE] = { 0, };
00132 
00133 struct sound {
00134    int ind;
00135    short *data;
00136    int datalen;
00137    int samplen;
00138    int silencelen;
00139    int repeat;
00140 };
00141 
00142 static struct sound sounds[] = {
00143    {AST_CONTROL_RINGING, ringtone, sizeof(ringtone) / 2, 16000, 32000, 1},
00144    {AST_CONTROL_BUSY, busy, sizeof(busy) / 2, 4000, 4000, 1},
00145    {AST_CONTROL_CONGESTION, busy, sizeof(busy) / 2, 2000, 2000, 1},
00146    {AST_CONTROL_RING, ring10, sizeof(ring10) / 2, 16000, 32000, 1},
00147    {AST_CONTROL_ANSWER, answer, sizeof(answer) / 2, 2200, 0, 0},
00148 };
00149 
00150 /* Sound command pipe */
00151 static int sndcmd[2];
00152 
00153 static struct chan_alsa_pvt {
00154    /* We only have one ALSA structure -- near sighted perhaps, but it
00155       keeps this driver as simple as possible -- as it should be. */
00156    struct ast_channel *owner;
00157    char exten[AST_MAX_EXTENSION];
00158    char context[AST_MAX_CONTEXT];
00159 #if 0
00160    snd_pcm_t *card;
00161 #endif
00162    snd_pcm_t *icard, *ocard;
00163 
00164 } alsa;
00165 
00166 /* Number of buffers...  Each is FRAMESIZE/8 ms long.  For example
00167    with 160 sample frames, and a buffer size of 3, we have a 60ms buffer, 
00168    usually plenty. */
00169 
00170 pthread_t sthread;
00171 
00172 #define MAX_BUFFER_SIZE 100
00173 
00174 /* File descriptors for sound device */
00175 static int readdev = -1;
00176 static int writedev = -1;
00177 
00178 static int autoanswer = 1;
00179 
00180 static int cursound = -1;
00181 static int sampsent = 0;
00182 static int silencelen = 0;
00183 static int offset = 0;
00184 static int nosound = 0;
00185 
00186 /* ZZ */
00187 static struct ast_channel *alsa_request(const char *type, int format, void *data, int *cause);
00188 static int alsa_digit(struct ast_channel *c, char digit, unsigned int duration);
00189 static int alsa_text(struct ast_channel *c, const char *text);
00190 static int alsa_hangup(struct ast_channel *c);
00191 static int alsa_answer(struct ast_channel *c);
00192 static struct ast_frame *alsa_read(struct ast_channel *chan);
00193 static int alsa_call(struct ast_channel *c, char *dest, int timeout);
00194 static int alsa_write(struct ast_channel *chan, struct ast_frame *f);
00195 static int alsa_indicate(struct ast_channel *chan, int cond, const void *data, size_t datalen);
00196 static int alsa_fixup(struct ast_channel *oldchan, struct ast_channel *newchan);
00197 
00198 static const struct ast_channel_tech alsa_tech = {
00199    .type = "Console",
00200    .description = tdesc,
00201    .capabilities = AST_FORMAT_SLINEAR,
00202    .requester = alsa_request,
00203    .send_digit_end = alsa_digit,
00204    .send_text = alsa_text,
00205    .hangup = alsa_hangup,
00206    .answer = alsa_answer,
00207    .read = alsa_read,
00208    .call = alsa_call,
00209    .write = alsa_write,
00210    .indicate = alsa_indicate,
00211    .fixup = alsa_fixup,
00212 };
00213 
00214 static int send_sound(void)
00215 {
00216    short myframe[FRAME_SIZE];
00217    int total = FRAME_SIZE;
00218    short *frame = NULL;
00219    int amt = 0, res, myoff;
00220    snd_pcm_state_t state;
00221 
00222    if (cursound == -1)
00223       return 0;
00224 
00225    res = total;
00226    if (sampsent < sounds[cursound].samplen) {
00227       myoff = 0;
00228       while (total) {
00229          amt = total;
00230          if (amt > (sounds[cursound].datalen - offset))
00231             amt = sounds[cursound].datalen - offset;
00232          memcpy(myframe + myoff, sounds[cursound].data + offset, amt * 2);
00233          total -= amt;
00234          offset += amt;
00235          sampsent += amt;
00236          myoff += amt;
00237          if (offset >= sounds[cursound].datalen)
00238             offset = 0;
00239       }
00240       /* Set it up for silence */
00241       if (sampsent >= sounds[cursound].samplen)
00242          silencelen = sounds[cursound].silencelen;
00243       frame = myframe;
00244    } else {
00245       if (silencelen > 0) {
00246          frame = silence;
00247          silencelen -= res;
00248       } else {
00249          if (sounds[cursound].repeat) {
00250             /* Start over */
00251             sampsent = 0;
00252             offset = 0;
00253          } else {
00254             cursound = -1;
00255             nosound = 0;
00256          }
00257          return 0;
00258       }
00259    }
00260 
00261    if (res == 0 || !frame)
00262       return 0;
00263 
00264 #ifdef ALSA_MONITOR
00265    alsa_monitor_write((char *) frame, res * 2);
00266 #endif
00267    state = snd_pcm_state(alsa.ocard);
00268    if (state == SND_PCM_STATE_XRUN)
00269       snd_pcm_prepare(alsa.ocard);
00270    res = snd_pcm_writei(alsa.ocard, frame, res);
00271    if (res > 0)
00272       return 0;
00273    return 0;
00274 }
00275 
00276 static void *sound_thread(void *unused)
00277 {
00278    fd_set rfds;
00279    fd_set wfds;
00280    int max, res;
00281 
00282    for (;;) {
00283       FD_ZERO(&rfds);
00284       FD_ZERO(&wfds);
00285       max = sndcmd[0];
00286       FD_SET(sndcmd[0], &rfds);
00287       if (cursound > -1) {
00288          FD_SET(writedev, &wfds);
00289          if (writedev > max)
00290             max = writedev;
00291       }
00292 #ifdef ALSA_MONITOR
00293       if (!alsa.owner) {
00294          FD_SET(readdev, &rfds);
00295          if (readdev > max)
00296             max = readdev;
00297       }
00298 #endif
00299       res = ast_select(max + 1, &rfds, &wfds, NULL, NULL);
00300       if (res < 1) {
00301          ast_log(LOG_WARNING, "select failed: %s\n", strerror(errno));
00302          continue;
00303       }
00304 #ifdef ALSA_MONITOR
00305       if (FD_ISSET(readdev, &rfds)) {
00306          /* Keep the pipe going with read audio */
00307          snd_pcm_state_t state;
00308          short buf[FRAME_SIZE];
00309          int r;
00310 
00311          state = snd_pcm_state(alsa.ocard);
00312          if (state == SND_PCM_STATE_XRUN) {
00313             snd_pcm_prepare(alsa.ocard);
00314          }
00315          r = snd_pcm_readi(alsa.icard, buf, FRAME_SIZE);
00316          if (r == -EPIPE) {
00317 #if DEBUG
00318             ast_log(LOG_ERROR, "XRUN read\n");
00319 #endif
00320             snd_pcm_prepare(alsa.icard);
00321          } else if (r == -ESTRPIPE) {
00322             ast_log(LOG_ERROR, "-ESTRPIPE\n");
00323             snd_pcm_prepare(alsa.icard);
00324          } else if (r < 0) {
00325             ast_log(LOG_ERROR, "Read error: %s\n", snd_strerror(r));
00326          } else
00327             alsa_monitor_read((char *) buf, r * 2);
00328       }
00329 #endif
00330       if (FD_ISSET(sndcmd[0], &rfds)) {
00331          read(sndcmd[0], &cursound, sizeof(cursound));
00332          silencelen = 0;
00333          offset = 0;
00334          sampsent = 0;
00335       }
00336       if (FD_ISSET(writedev, &wfds))
00337          if (send_sound())
00338             ast_log(LOG_WARNING, "Failed to write sound\n");
00339    }
00340    /* Never reached */
00341    return NULL;
00342 }
00343 
00344 static snd_pcm_t *alsa_card_init(char *dev, snd_pcm_stream_t stream)
00345 {
00346    int err;
00347    int direction;
00348    snd_pcm_t *handle = NULL;
00349    snd_pcm_hw_params_t *hwparams = NULL;
00350    snd_pcm_sw_params_t *swparams = NULL;
00351    struct pollfd pfd;
00352    snd_pcm_uframes_t period_size = PERIOD_FRAMES * 4;
00353    /* int period_bytes = 0; */
00354    snd_pcm_uframes_t buffer_size = 0;
00355 
00356    unsigned int rate = DESIRED_RATE;
00357 #if 0
00358    unsigned int per_min = 1;
00359 #endif
00360    /* unsigned int per_max = 8; */
00361    snd_pcm_uframes_t start_threshold, stop_threshold;
00362 
00363    err = snd_pcm_open(&handle, dev, stream, O_NONBLOCK);
00364    if (err < 0) {
00365       ast_log(LOG_ERROR, "snd_pcm_open failed: %s\n", snd_strerror(err));
00366       return NULL;
00367    } else
00368       ast_log(LOG_DEBUG, "Opening device %s in %s mode\n", dev, (stream == SND_PCM_STREAM_CAPTURE) ? "read" : "write");
00369 
00370    snd_pcm_hw_params_alloca(&hwparams);
00371    snd_pcm_hw_params_any(handle, hwparams);
00372 
00373    err = snd_pcm_hw_params_set_access(handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED);
00374    if (err < 0)
00375       ast_log(LOG_ERROR, "set_access failed: %s\n", snd_strerror(err));
00376 
00377    err = snd_pcm_hw_params_set_format(handle, hwparams, format);
00378    if (err < 0)
00379       ast_log(LOG_ERROR, "set_format failed: %s\n", snd_strerror(err));
00380 
00381    err = snd_pcm_hw_params_set_channels(handle, hwparams, 1);
00382    if (err < 0)
00383       ast_log(LOG_ERROR, "set_channels failed: %s\n", snd_strerror(err));
00384 
00385    direction = 0;
00386    err = snd_pcm_hw_params_set_rate_near(handle, hwparams, &rate, &direction);
00387    if (rate != DESIRED_RATE)
00388       ast_log(LOG_WARNING, "Rate not correct, requested %d, got %d\n", DESIRED_RATE, rate);
00389 
00390    direction = 0;
00391    err = snd_pcm_hw_params_set_period_size_near(handle, hwparams, &period_size, &direction);
00392    if (err < 0)
00393       ast_log(LOG_ERROR, "period_size(%ld frames) is bad: %s\n", period_size, snd_strerror(err));
00394    else
00395       ast_log(LOG_DEBUG, "Period size is %d\n", err);
00396 
00397    buffer_size = 4096 * 2;    /* period_size * 16; */
00398    err = snd_pcm_hw_params_set_buffer_size_near(handle, hwparams, &buffer_size);
00399    if (err < 0)
00400       ast_log(LOG_WARNING, "Problem setting buffer size of %ld: %s\n", buffer_size, snd_strerror(err));
00401    else
00402       ast_log(LOG_DEBUG, "Buffer size is set to %d frames\n", err);
00403 
00404 #if 0
00405    direction = 0;
00406    err = snd_pcm_hw_params_set_periods_min(handle, hwparams, &per_min, &direction);
00407    if (err < 0)
00408       ast_log(LOG_ERROR, "periods_min: %s\n", snd_strerror(err));
00409 
00410    err = snd_pcm_hw_params_set_periods_max(handle, hwparams, &per_max, 0);
00411    if (err < 0)
00412       ast_log(LOG_ERROR, "periods_max: %s\n", snd_strerror(err));
00413 #endif
00414 
00415    err = snd_pcm_hw_params(handle, hwparams);
00416    if (err < 0)
00417       ast_log(LOG_ERROR, "Couldn't set the new hw params: %s\n", snd_strerror(err));
00418 
00419    snd_pcm_sw_params_alloca(&swparams);
00420    snd_pcm_sw_params_current(handle, swparams);
00421 
00422 #if 1
00423    if (stream == SND_PCM_STREAM_PLAYBACK)
00424       start_threshold = period_size;
00425    else
00426       start_threshold = 1;
00427 
00428    err = snd_pcm_sw_params_set_start_threshold(handle, swparams, start_threshold);
00429    if (err < 0)
00430       ast_log(LOG_ERROR, "start threshold: %s\n", snd_strerror(err));
00431 #endif
00432 
00433 #if 1
00434    if (stream == SND_PCM_STREAM_PLAYBACK)
00435       stop_threshold = buffer_size;
00436    else
00437       stop_threshold = buffer_size;
00438 
00439    err = snd_pcm_sw_params_set_stop_threshold(handle, swparams, stop_threshold);
00440    if (err < 0)
00441       ast_log(LOG_ERROR, "stop threshold: %s\n", snd_strerror(err));
00442 #endif
00443 #if 0
00444    err = snd_pcm_sw_params_set_xfer_align(handle, swparams, PERIOD_FRAMES);
00445    if (err < 0)
00446       ast_log(LOG_ERROR, "Unable to set xfer alignment: %s\n", snd_strerror(err));
00447 #endif
00448 
00449 #if 0
00450    err = snd_pcm_sw_params_set_silence_threshold(handle, swparams, silencethreshold);
00451    if (err < 0)
00452       ast_log(LOG_ERROR, "Unable to set silence threshold: %s\n", snd_strerror(err));
00453 #endif
00454    err = snd_pcm_sw_params(handle, swparams);
00455    if (err < 0)
00456       ast_log(LOG_ERROR, "sw_params: %s\n", snd_strerror(err));
00457 
00458    err = snd_pcm_poll_descriptors_count(handle);
00459    if (err <= 0)
00460       ast_log(LOG_ERROR, "Unable to get a poll descriptors count, error is %s\n", snd_strerror(err));
00461    if (err != 1)
00462       ast_log(LOG_DEBUG, "Can't handle more than one device\n");
00463 
00464    snd_pcm_poll_descriptors(handle, &pfd, err);
00465    ast_log(LOG_DEBUG, "Acquired fd %d from the poll descriptor\n", pfd.fd);
00466 
00467    if (stream == SND_PCM_STREAM_CAPTURE)
00468       readdev = pfd.fd;
00469    else
00470       writedev = pfd.fd;
00471 
00472    return handle;
00473 }
00474 
00475 static int soundcard_init(void)
00476 {
00477    alsa.icard = alsa_card_init(indevname, SND_PCM_STREAM_CAPTURE);
00478    alsa.ocard = alsa_card_init(outdevname, SND_PCM_STREAM_PLAYBACK);
00479 
00480    if (!alsa.icard || !alsa.ocard) {
00481       ast_log(LOG_ERROR, "Problem opening alsa I/O devices\n");
00482       return -1;
00483    }
00484 
00485    return readdev;
00486 }
00487 
00488 static int alsa_digit(struct ast_channel *c, char digit, unsigned int duration)
00489 {
00490    ast_mutex_lock(&alsalock);
00491    ast_verbose(" << Console Received digit %c of duration %u ms >> \n", 
00492       digit, duration);
00493    ast_mutex_unlock(&alsalock);
00494    return 0;
00495 }
00496 
00497 static int alsa_text(struct ast_channel *c, const char *text)
00498 {
00499    ast_mutex_lock(&alsalock);
00500    ast_verbose(" << Console Received text %s >> \n", text);
00501    ast_mutex_unlock(&alsalock);
00502    return 0;
00503 }
00504 
00505 static void grab_owner(void)
00506 {
00507    while (alsa.owner && ast_mutex_trylock(&alsa.owner->lock)) {
00508       ast_mutex_unlock(&alsalock);
00509       usleep(1);
00510       ast_mutex_lock(&alsalock);
00511    }
00512 }
00513 
00514 static int alsa_call(struct ast_channel *c, char *dest, int timeout)
00515 {
00516    int res = 3;
00517    struct ast_frame f = { AST_FRAME_CONTROL };
00518    ast_mutex_lock(&alsalock);
00519    ast_verbose(" << Call placed to '%s' on console >> \n", dest);
00520    if (autoanswer) {
00521       ast_verbose(" << Auto-answered >> \n");
00522       grab_owner();
00523       if (alsa.owner) {
00524          f.subclass = AST_CONTROL_ANSWER;
00525          ast_queue_frame(alsa.owner, &f);
00526          ast_mutex_unlock(&alsa.owner->lock);
00527       }
00528    } else {
00529       ast_verbose(" << Type 'answer' to answer, or use 'autoanswer' for future calls >> \n");
00530       grab_owner();
00531       if (alsa.owner) {
00532          f.subclass = AST_CONTROL_RINGING;
00533          ast_queue_frame(alsa.owner, &f);
00534          ast_mutex_unlock(&alsa.owner->lock);
00535       }
00536       write(sndcmd[1], &res, sizeof(res));
00537    }
00538    snd_pcm_prepare(alsa.icard);
00539    snd_pcm_start(alsa.icard);
00540    ast_mutex_unlock(&alsalock);
00541    return 0;
00542 }
00543 
00544 static void answer_sound(void)
00545 {
00546    int res;
00547    nosound = 1;
00548    res = 4;
00549    write(sndcmd[1], &res, sizeof(res));
00550 
00551 }
00552 
00553 static int alsa_answer(struct ast_channel *c)
00554 {
00555    ast_mutex_lock(&alsalock);
00556    ast_verbose(" << Console call has been answered >> \n");
00557    answer_sound();
00558    ast_setstate(c, AST_STATE_UP);
00559    cursound = -1;
00560    snd_pcm_prepare(alsa.icard);
00561    snd_pcm_start(alsa.icard);
00562    ast_mutex_unlock(&alsalock);
00563    return 0;
00564 }
00565 
00566 static int alsa_hangup(struct ast_channel *c)
00567 {
00568    int res;
00569    ast_mutex_lock(&alsalock);
00570    cursound = -1;
00571    c->tech_pvt = NULL;
00572    alsa.owner = NULL;
00573    ast_verbose(" << Hangup on console >> \n");
00574    ast_module_unref(ast_module_info->self);
00575    if (hookstate) {
00576       hookstate = 0;
00577       if (!autoanswer) {
00578          /* Congestion noise */
00579          res = 2;
00580          write(sndcmd[1], &res, sizeof(res));
00581       }
00582    }
00583    snd_pcm_drop(alsa.icard);
00584    ast_mutex_unlock(&alsalock);
00585    return 0;
00586 }
00587 
00588 static int alsa_write(struct ast_channel *chan, struct ast_frame *f)
00589 {
00590    static char sizbuf[8000];
00591    static int sizpos = 0;
00592    int len = sizpos;
00593    int pos;
00594    int res = 0;
00595    /* size_t frames = 0; */
00596    snd_pcm_state_t state;
00597 
00598    /* Immediately return if no sound is enabled */
00599    if (nosound)
00600       return 0;
00601 
00602    ast_mutex_lock(&alsalock);
00603    /* Stop any currently playing sound */
00604    if (cursound != -1) {
00605       snd_pcm_drop(alsa.ocard);
00606       snd_pcm_prepare(alsa.ocard);
00607       cursound = -1;
00608    }
00609 
00610 
00611    /* We have to digest the frame in 160-byte portions */
00612    if (f->datalen > sizeof(sizbuf) - sizpos) {
00613       ast_log(LOG_WARNING, "Frame too large\n");
00614       res = -1;
00615    } else {
00616       memcpy(sizbuf + sizpos, f->data, f->datalen);
00617       len += f->datalen;
00618       pos = 0;
00619 #ifdef ALSA_MONITOR
00620       alsa_monitor_write(sizbuf, len);
00621 #endif
00622       state = snd_pcm_state(alsa.ocard);
00623       if (state == SND_PCM_STATE_XRUN)
00624          snd_pcm_prepare(alsa.ocard);
00625       res = snd_pcm_writei(alsa.ocard, sizbuf, len / 2);
00626       if (res == -EPIPE) {
00627 #if DEBUG
00628          ast_log(LOG_DEBUG, "XRUN write\n");
00629 #endif
00630          snd_pcm_prepare(alsa.ocard);
00631          res = snd_pcm_writei(alsa.ocard, sizbuf, len / 2);
00632          if (res != len / 2) {
00633             ast_log(LOG_ERROR, "Write error: %s\n", snd_strerror(res));
00634             res = -1;
00635          } else if (res < 0) {
00636             ast_log(LOG_ERROR, "Write error %s\n", snd_strerror(res));
00637             res = -1;
00638          }
00639       } else {
00640          if (res == -ESTRPIPE)
00641             ast_log(LOG_ERROR, "You've got some big problems\n");
00642          else if (res < 0)
00643             ast_log(LOG_NOTICE, "Error %d on write\n", res);
00644       }
00645    }
00646    ast_mutex_unlock(&alsalock);
00647    if (res > 0)
00648       res = 0;
00649    return res;
00650 }
00651 
00652 
00653 static struct ast_frame *alsa_read(struct ast_channel *chan)
00654 {
00655    static struct ast_frame f;
00656    static short __buf[FRAME_SIZE + AST_FRIENDLY_OFFSET / 2];
00657    short *buf;
00658    static int readpos = 0;
00659    static int left = FRAME_SIZE;
00660    snd_pcm_state_t state;
00661    int r = 0;
00662    int off = 0;
00663 
00664    ast_mutex_lock(&alsalock);
00665    /* Acknowledge any pending cmd */
00666    f.frametype = AST_FRAME_NULL;
00667    f.subclass = 0;
00668    f.samples = 0;
00669    f.datalen = 0;
00670    f.data = NULL;
00671    f.offset = 0;
00672    f.src = "Console";
00673    f.mallocd = 0;
00674    f.delivery.tv_sec = 0;
00675    f.delivery.tv_usec = 0;
00676 
00677    state = snd_pcm_state(alsa.icard);
00678    if ((state != SND_PCM_STATE_PREPARED) && (state != SND_PCM_STATE_RUNNING)) {
00679       snd_pcm_prepare(alsa.icard);
00680    }
00681 
00682    buf = __buf + AST_FRIENDLY_OFFSET / 2;
00683 
00684    r = snd_pcm_readi(alsa.icard, buf + readpos, left);
00685    if (r == -EPIPE) {
00686 #if DEBUG
00687       ast_log(LOG_ERROR, "XRUN read\n");
00688 #endif
00689       snd_pcm_prepare(alsa.icard);
00690    } else if (r == -ESTRPIPE) {
00691       ast_log(LOG_ERROR, "-ESTRPIPE\n");
00692       snd_pcm_prepare(alsa.icard);
00693    } else if (r < 0) {
00694       ast_log(LOG_ERROR, "Read error: %s\n", snd_strerror(r));
00695    } else if (r >= 0) {
00696       off -= r;
00697    }
00698    /* Update positions */
00699    readpos += r;
00700    left -= r;
00701 
00702    if (readpos >= FRAME_SIZE) {
00703       /* A real frame */
00704       readpos = 0;
00705       left = FRAME_SIZE;
00706       if (chan->_state != AST_STATE_UP) {
00707          /* Don't transmit unless it's up */
00708          ast_mutex_unlock(&alsalock);
00709          return &f;
00710       }
00711       f.frametype = AST_FRAME_VOICE;
00712       f.subclass = AST_FORMAT_SLINEAR;
00713       f.samples = FRAME_SIZE;
00714       f.datalen = FRAME_SIZE * 2;
00715       f.data = buf;
00716       f.offset = AST_FRIENDLY_OFFSET;
00717       f.src = "Console";
00718       f.mallocd = 0;
00719 #ifdef ALSA_MONITOR
00720       alsa_monitor_read((char *) buf, FRAME_SIZE * 2);
00721 #endif
00722 
00723    }
00724    ast_mutex_unlock(&alsalock);
00725    return &f;
00726 }
00727 
00728 static int alsa_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
00729 {
00730    struct chan_alsa_pvt *p = newchan->tech_pvt;
00731    ast_mutex_lock(&alsalock);
00732    p->owner = newchan;
00733    ast_mutex_unlock(&alsalock);
00734    return 0;
00735 }
00736 
00737 static int alsa_indicate(struct ast_channel *chan, int cond, const void *data, size_t datalen)
00738 {
00739    int res = 0;
00740 
00741    ast_mutex_lock(&alsalock);
00742 
00743    switch (cond) {
00744       case AST_CONTROL_BUSY:
00745          res = 1;
00746          break;
00747       case AST_CONTROL_CONGESTION:
00748          res = 2;
00749          break;
00750       case AST_CONTROL_RINGING:
00751       case AST_CONTROL_PROGRESS:
00752          break;
00753       case -1:
00754          res = -1;
00755          break;
00756       case AST_CONTROL_VIDUPDATE:
00757          res = -1;
00758          break;
00759       case AST_CONTROL_HOLD:
00760          ast_verbose(" << Console Has Been Placed on Hold >> \n");
00761          ast_moh_start(chan, data, mohinterpret);
00762          break;
00763       case AST_CONTROL_UNHOLD:
00764          ast_verbose(" << Console Has Been Retrieved from Hold >> \n");
00765          ast_moh_stop(chan);
00766          break;
00767       default:
00768          ast_log(LOG_WARNING, "Don't know how to display condition %d on %s\n", cond, chan->name);
00769          res = -1;
00770    }
00771 
00772    if (res > -1)
00773       write(sndcmd[1], &res, sizeof(res));
00774 
00775    ast_mutex_unlock(&alsalock);
00776 
00777    return res;
00778 }
00779 
00780 static struct ast_channel *alsa_new(struct chan_alsa_pvt *p, int state)
00781 {
00782    struct ast_channel *tmp = NULL;
00783    if (!(tmp = ast_channel_alloc(1, state, 0, 0, "", p->exten, p->context, 0, "ALSA/%s", indevname)))
00784       return NULL;
00785 
00786    tmp->tech = &alsa_tech;
00787    tmp->fds[0] = readdev;
00788    tmp->nativeformats = AST_FORMAT_SLINEAR;
00789    tmp->readformat = AST_FORMAT_SLINEAR;
00790    tmp->writeformat = AST_FORMAT_SLINEAR;
00791    tmp->tech_pvt = p;
00792    if (!ast_strlen_zero(p->context))
00793       ast_copy_string(tmp->context, p->context, sizeof(tmp->context));
00794    if (!ast_strlen_zero(p->exten))
00795       ast_copy_string(tmp->exten, p->exten, sizeof(tmp->exten));
00796    if (!ast_strlen_zero(language))
00797       ast_string_field_set(tmp, language, language);
00798    p->owner = tmp;
00799    ast_module_ref(ast_module_info->self);
00800    ast_jb_configure(tmp, &global_jbconf);
00801    if (state != AST_STATE_DOWN) {
00802       if (ast_pbx_start(tmp)) {
00803          ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name);
00804          ast_hangup(tmp);
00805          tmp = NULL;
00806       }
00807    }
00808 
00809    return tmp;
00810 }
00811 
00812 static struct ast_channel *alsa_request(const char *type, int format, void *data, int *cause)
00813 {
00814    int oldformat = format;
00815    struct ast_channel *tmp = NULL;
00816 
00817    format &= AST_FORMAT_SLINEAR;
00818    if (!format) {
00819       ast_log(LOG_NOTICE, "Asked to get a channel of format '%d'\n", oldformat);
00820       return NULL;
00821    }
00822 
00823    ast_mutex_lock(&alsalock);
00824 
00825    if (alsa.owner) {
00826       ast_log(LOG_NOTICE, "Already have a call on the ALSA channel\n");
00827       *cause = AST_CAUSE_BUSY;
00828    } else if (!(tmp = alsa_new(&alsa, AST_STATE_DOWN)))
00829       ast_log(LOG_WARNING, "Unable to create new ALSA channel\n");
00830 
00831    ast_mutex_unlock(&alsalock);
00832 
00833    return tmp;
00834 }
00835 
00836 static int console_autoanswer_deprecated(int fd, int argc, char *argv[])
00837 {
00838    int res = RESULT_SUCCESS;
00839 
00840    if ((argc != 1) && (argc != 2))
00841       return RESULT_SHOWUSAGE;
00842 
00843    ast_mutex_lock(&alsalock);
00844 
00845    if (argc == 1) {
00846       ast_cli(fd, "Auto answer is %s.\n", autoanswer ? "on" : "off");
00847    } else {
00848       if (!strcasecmp(argv[1], "on"))
00849          autoanswer = -1;
00850       else if (!strcasecmp(argv[1], "off"))
00851          autoanswer = 0;
00852       else
00853          res = RESULT_SHOWUSAGE;
00854    }
00855 
00856    ast_mutex_unlock(&alsalock);
00857 
00858    return res;
00859 }
00860 
00861 static int console_autoanswer(int fd, int argc, char *argv[])
00862 {
00863    int res = RESULT_SUCCESS;;
00864    if ((argc != 2) && (argc != 3))
00865       return RESULT_SHOWUSAGE;
00866    ast_mutex_lock(&alsalock);
00867    if (argc == 2) {
00868       ast_cli(fd, "Auto answer is %s.\n", autoanswer ? "on" : "off");
00869    } else {
00870       if (!strcasecmp(argv[2], "on"))
00871          autoanswer = -1;
00872       else if (!strcasecmp(argv[2], "off"))
00873          autoanswer = 0;
00874       else
00875          res = RESULT_SHOWUSAGE;
00876    }
00877    ast_mutex_unlock(&alsalock);
00878    return res;
00879 }
00880 
00881 static char *autoanswer_complete(const char *line, const char *word, int pos, int state)
00882 {
00883 #ifndef MIN
00884 #define MIN(a,b) ((a) < (b) ? (a) : (b))
00885 #endif
00886    switch (state) {
00887       case 0:
00888          if (!ast_strlen_zero(word) && !strncasecmp(word, "on", MIN(strlen(word), 2)))
00889             return ast_strdup("on");
00890       case 1:
00891          if (!ast_strlen_zero(word) && !strncasecmp(word, "off", MIN(strlen(word), 3)))
00892             return ast_strdup("off");
00893       default:
00894          return NULL;
00895    }
00896    return NULL;
00897 }
00898 
00899 static const char autoanswer_usage[] =
00900    "Usage: console autoanswer [on|off]\n"
00901    "       Enables or disables autoanswer feature.  If used without\n"
00902    "       argument, displays the current on/off status of autoanswer.\n"
00903    "       The default value of autoanswer is in 'alsa.conf'.\n";
00904 
00905 static int console_answer_deprecated(int fd, int argc, char *argv[])
00906 {
00907    int res = RESULT_SUCCESS;
00908 
00909    if (argc != 1)
00910       return RESULT_SHOWUSAGE;
00911 
00912    ast_mutex_lock(&alsalock);
00913 
00914    if (!alsa.owner) {
00915       ast_cli(fd, "No one is calling us\n");
00916       res = RESULT_FAILURE;
00917    } else {
00918       hookstate = 1;
00919       cursound = -1;
00920       grab_owner();
00921       if (alsa.owner) {
00922          struct ast_frame f = { AST_FRAME_CONTROL, AST_CONTROL_ANSWER };
00923          ast_queue_frame(alsa.owner, &f);
00924          ast_mutex_unlock(&alsa.owner->lock);
00925       }
00926       answer_sound();
00927    }
00928 
00929    snd_pcm_prepare(alsa.icard);
00930    snd_pcm_start(alsa.icard);
00931 
00932    ast_mutex_unlock(&alsalock);
00933 
00934    return RESULT_SUCCESS;
00935 }
00936 
00937 static int console_answer(int fd, int argc, char *argv[])
00938 {
00939    int res = RESULT_SUCCESS;
00940 
00941    if (argc != 2)
00942       return RESULT_SHOWUSAGE;
00943 
00944    ast_mutex_lock(&alsalock);
00945 
00946    if (!alsa.owner) {
00947       ast_cli(fd, "No one is calling us\n");
00948       res = RESULT_FAILURE;
00949    } else {
00950       hookstate = 1;
00951       cursound = -1;
00952       grab_owner();
00953       if (alsa.owner) {
00954          struct ast_frame f = { AST_FRAME_CONTROL, AST_CONTROL_ANSWER };
00955          ast_queue_frame(alsa.owner, &f);
00956          ast_mutex_unlock(&alsa.owner->lock);
00957       }
00958       answer_sound();
00959    }
00960 
00961    snd_pcm_prepare(alsa.icard);
00962    snd_pcm_start(alsa.icard);
00963 
00964    ast_mutex_unlock(&alsalock);
00965 
00966    return RESULT_SUCCESS;
00967 }
00968 
00969 static char sendtext_usage[] =
00970    "Usage: console send text <message>\n"
00971    "       Sends a text message for display on the remote terminal.\n";
00972 
00973 static int console_sendtext_deprecated(int fd, int argc, char *argv[])
00974 {
00975    int tmparg = 2;
00976    int res = RESULT_SUCCESS;
00977 
00978    if (argc < 2)
00979       return RESULT_SHOWUSAGE;
00980 
00981    ast_mutex_lock(&alsalock);
00982 
00983    if (!alsa.owner) {
00984       ast_cli(fd, "No one is calling us\n");
00985       res = RESULT_FAILURE;
00986    } else {
00987       struct ast_frame f = { AST_FRAME_TEXT, 0 };
00988       char text2send[256] = "";
00989       text2send[0] = '\0';
00990       while (tmparg < argc) {
00991          strncat(text2send, argv[tmparg++], sizeof(text2send) - strlen(text2send) - 1);
00992          strncat(text2send, " ", sizeof(text2send) - strlen(text2send) - 1);
00993       }
00994       text2send[strlen(text2send) - 1] = '\n';
00995       f.data = text2send;
00996       f.datalen = strlen(text2send) + 1;
00997       grab_owner();
00998       if (alsa.owner) {
00999          ast_queue_frame(alsa.owner, &f);
01000          f.frametype = AST_FRAME_CONTROL;
01001          f.subclass = AST_CONTROL_ANSWER;
01002          f.data = NULL;
01003          f.datalen = 0;
01004          ast_queue_frame(alsa.owner, &f);
01005          ast_mutex_unlock(&alsa.owner->lock);
01006       }
01007    }
01008 
01009    ast_mutex_unlock(&alsalock);
01010 
01011    return res;
01012 }
01013 
01014 static int console_sendtext(int fd, int argc, char *argv[])
01015 {
01016    int tmparg = 3;
01017    int res = RESULT_SUCCESS;
01018 
01019    if (argc < 3)
01020       return RESULT_SHOWUSAGE;
01021 
01022    ast_mutex_lock(&alsalock);
01023 
01024    if (!alsa.owner) {
01025       ast_cli(fd, "No one is calling us\n");
01026       res = RESULT_FAILURE;
01027    } else {
01028       struct ast_frame f = { AST_FRAME_TEXT, 0 };
01029       char text2send[256] = "";
01030       text2send[0] = '\0';
01031       while (tmparg < argc) {
01032          strncat(text2send, argv[tmparg++], sizeof(text2send) - strlen(text2send) - 1);
01033          strncat(text2send, " ", sizeof(text2send) - strlen(text2send) - 1);
01034       }
01035       text2send[strlen(text2send) - 1] = '\n';
01036       f.data = text2send;
01037       f.datalen = strlen(text2send) + 1;
01038       grab_owner();
01039       if (alsa.owner) {
01040          ast_queue_frame(alsa.owner, &f);
01041          f.frametype = AST_FRAME_CONTROL;
01042          f.subclass = AST_CONTROL_ANSWER;
01043          f.data = NULL;
01044          f.datalen = 0;
01045          ast_queue_frame(alsa.owner, &f);
01046          ast_mutex_unlock(&alsa.owner->lock);
01047       }
01048    }
01049 
01050    ast_mutex_unlock(&alsalock);
01051 
01052    return res;
01053 }
01054 
01055 static char answer_usage[] =
01056    "Usage: console answer\n"
01057    "       Answers an incoming call on the console (ALSA) channel.\n";
01058 
01059 static int console_hangup_deprecated(int fd, int argc, char *argv[])
01060 {
01061    int res = RESULT_SUCCESS;
01062 
01063    if (argc != 1)
01064       return RESULT_SHOWUSAGE;
01065 
01066    cursound = -1;
01067 
01068    ast_mutex_lock(&alsalock);
01069 
01070    if (!alsa.owner && !hookstate) {
01071       ast_cli(fd, "No call to hangup up\n");
01072       res = RESULT_FAILURE;
01073    } else {
01074       hookstate = 0;
01075       grab_owner();
01076       if (alsa.owner) {
01077          ast_queue_hangup(alsa.owner);
01078          ast_mutex_unlock(&alsa.owner->lock);
01079       }
01080    }
01081 
01082    ast_mutex_unlock(&alsalock);
01083 
01084    return res;
01085 }
01086 
01087 static int console_hangup(int fd, int argc, char *argv[])
01088 {
01089    int res = RESULT_SUCCESS;
01090 
01091    if (argc != 2)
01092       return RESULT_SHOWUSAGE;
01093 
01094    cursound = -1;
01095 
01096    ast_mutex_lock(&alsalock);
01097 
01098    if (!alsa.owner && !hookstate) {
01099       ast_cli(fd, "No call to hangup up\n");
01100       res = RESULT_FAILURE;
01101    } else {
01102       hookstate = 0;
01103       grab_owner();
01104       if (alsa.owner) {
01105          ast_queue_hangup(alsa.owner);
01106          ast_mutex_unlock(&alsa.owner->lock);
01107       }
01108    }
01109 
01110    ast_mutex_unlock(&alsalock);
01111 
01112    return res;
01113 }
01114 
01115 static char hangup_usage[] =
01116    "Usage: console hangup\n"
01117    "       Hangs up any call currently placed on the console.\n";
01118 
01119 static int console_dial_deprecated(int fd, int argc, char *argv[])
01120 {
01121    char tmp[256], *tmp2;
01122    char *mye, *myc;
01123    char *d;
01124    int res = RESULT_SUCCESS;
01125 
01126    if ((argc != 1) && (argc != 2))
01127       return RESULT_SHOWUSAGE;
01128 
01129    ast_mutex_lock(&alsalock);
01130 
01131    if (alsa.owner) {
01132       if (argc == 2) {
01133          d = argv[1];
01134          grab_owner();
01135          if (alsa.owner) {
01136             struct ast_frame f = { AST_FRAME_DTMF };
01137             while (*d) {
01138                f.subclass = *d;
01139                ast_queue_frame(alsa.owner, &f);
01140                d++;
01141             }
01142             ast_mutex_unlock(&alsa.owner->lock);
01143          }
01144       } else {
01145          ast_cli(fd, "You're already in a call.  You can use this only to dial digits until you hangup\n");
01146          res = RESULT_FAILURE;
01147       }
01148    } else {
01149       mye = exten;
01150       myc = context;
01151       if (argc == 2) {
01152          char *stringp = NULL;
01153          ast_copy_string(tmp, argv[1], sizeof(tmp));
01154          stringp = tmp;
01155          strsep(&stringp, "@");
01156          tmp2 = strsep(&stringp, "@");
01157          if (!ast_strlen_zero(tmp))
01158             mye = tmp;
01159          if (!ast_strlen_zero(tmp2))
01160             myc = tmp2;
01161       }
01162       if (ast_exists_extension(NULL, myc, mye, 1, NULL)) {
01163          ast_copy_string(alsa.exten, mye, sizeof(alsa.exten));
01164          ast_copy_string(alsa.context, myc, sizeof(alsa.context));
01165          hookstate = 1;
01166          alsa_new(&alsa, AST_STATE_RINGING);
01167       } else
01168          ast_cli(fd, "No such extension '%s' in context '%s'\n", mye, myc);
01169    }
01170 
01171    ast_mutex_unlock(&alsalock);
01172 
01173    return res;
01174 }
01175 
01176 static int console_dial(int fd, int argc, char *argv[])
01177 {
01178    char tmp[256], *tmp2;
01179    char *mye, *myc;
01180    char *d;
01181    int res = RESULT_SUCCESS;
01182 
01183    if ((argc != 2) && (argc != 3))
01184       return RESULT_SHOWUSAGE;
01185 
01186    ast_mutex_lock(&alsalock);
01187 
01188    if (alsa.owner) {
01189       if (argc == 3) {
01190          d = argv[2];
01191          grab_owner();
01192          if (alsa.owner) {
01193             struct ast_frame f = { AST_FRAME_DTMF };
01194             while (*d) {
01195                f.subclass = *d;
01196                ast_queue_frame(alsa.owner, &f);
01197                d++;
01198             }
01199             ast_mutex_unlock(&alsa.owner->lock);
01200          }
01201       } else {
01202          ast_cli(fd, "You're already in a call.  You can use this only to dial digits until you hangup\n");
01203          res = RESULT_FAILURE;
01204       }
01205    } else {
01206       mye = exten;
01207       myc = context;
01208       if (argc == 3) {
01209          char *stringp = NULL;
01210          ast_copy_string(tmp, argv[2], sizeof(tmp));
01211          stringp = tmp;
01212          strsep(&stringp, "@");
01213          tmp2 = strsep(&stringp, "@");
01214          if (!ast_strlen_zero(tmp))
01215             mye = tmp;
01216          if (!ast_strlen_zero(tmp2))
01217             myc = tmp2;
01218       }
01219       if (ast_exists_extension(NULL, myc, mye, 1, NULL)) {
01220          ast_copy_string(alsa.exten, mye, sizeof(alsa.exten));
01221          ast_copy_string(alsa.context, myc, sizeof(alsa.context));
01222          hookstate = 1;
01223          alsa_new(&alsa, AST_STATE_RINGING);
01224       } else
01225          ast_cli(fd, "No such extension '%s' in context '%s'\n", mye, myc);
01226    }
01227 
01228    ast_mutex_unlock(&alsalock);
01229 
01230    return res;
01231 }
01232 
01233 static char dial_usage[] =
01234    "Usage: console dial [extension[@context]]\n"
01235    "       Dials a given extension (and context if specified)\n";
01236 
01237 static struct ast_cli_entry cli_alsa_answer_deprecated = {
01238    { "answer", NULL },
01239    console_answer_deprecated, NULL,
01240    NULL };
01241 
01242 static struct ast_cli_entry cli_alsa_hangup_deprecated = {
01243    { "hangup", NULL },
01244    console_hangup_deprecated, NULL,
01245    NULL };
01246 
01247 static struct ast_cli_entry cli_alsa_dial_deprecated = {
01248    { "dial", NULL },
01249    console_dial_deprecated, NULL,
01250    NULL };
01251 
01252 static struct ast_cli_entry cli_alsa_send_text_deprecated = {
01253    { "send", "text", NULL },
01254    console_sendtext_deprecated, NULL,
01255    NULL };
01256 
01257 static struct ast_cli_entry cli_alsa_autoanswer_deprecated = {
01258    { "autoanswer", NULL },
01259    console_autoanswer_deprecated, NULL,
01260    NULL, autoanswer_complete };
01261 
01262 static struct ast_cli_entry cli_alsa[] = {
01263    { { "console", "answer", NULL },
01264    console_answer, "Answer an incoming console call",
01265    answer_usage, NULL, &cli_alsa_answer_deprecated },
01266 
01267    { { "console", "hangup", NULL },
01268    console_hangup, "Hangup a call on the console",
01269    hangup_usage, NULL, &cli_alsa_hangup_deprecated },
01270 
01271    { { "console", "dial", NULL },
01272    console_dial, "Dial an extension on the console",
01273    dial_usage, NULL, &cli_alsa_dial_deprecated },
01274 
01275    { { "console", "send", "text", NULL },
01276    console_sendtext, "Send text to the remote device",
01277    sendtext_usage, NULL, &cli_alsa_send_text_deprecated },
01278 
01279    { { "console", "autoanswer", NULL },
01280    console_autoanswer, "Sets/displays autoanswer",
01281    autoanswer_usage, autoanswer_complete, &cli_alsa_autoanswer_deprecated },
01282 };
01283 
01284 static int load_module(void)
01285 {
01286    int res;
01287    struct ast_config *cfg;
01288    struct ast_variable *v;
01289 
01290    /* Copy the default jb config over global_jbconf */
01291    memcpy(&global_jbconf, &default_jbconf, sizeof(struct ast_jb_conf));
01292 
01293    strcpy(mohinterpret, "default");
01294    if (!(cfg = ast_config_load(config)))
01295       return AST_MODULE_LOAD_DECLINE;
01296 
01297    v = ast_variable_browse(cfg, "general");
01298    for (; v; v = v->next) {
01299       /* handle jb conf */
01300       if (!ast_jb_read_conf(&global_jbconf, v->name, v->value))
01301          continue;
01302 
01303       if (!strcasecmp(v->name, "autoanswer"))
01304          autoanswer = ast_true(v->value);
01305       else if (!strcasecmp(v->name, "silencesuppression"))
01306          silencesuppression = ast_true(v->value);
01307       else if (!strcasecmp(v->name, "silencethreshold"))
01308          silencethreshold = atoi(v->value);
01309       else if (!strcasecmp(v->name, "context"))
01310          ast_copy_string(context, v->value, sizeof(context));
01311       else if (!strcasecmp(v->name, "language"))
01312          ast_copy_string(language, v->value, sizeof(language));
01313       else if (!strcasecmp(v->name, "extension"))
01314          ast_copy_string(exten, v->value, sizeof(exten));
01315       else if (!strcasecmp(v->name, "input_device"))
01316          ast_copy_string(indevname, v->value, sizeof(indevname));
01317       else if (!strcasecmp(v->name, "output_device"))
01318          ast_copy_string(outdevname, v->value, sizeof(outdevname));
01319       else if (!strcasecmp(v->name, "mohinterpret"))
01320          ast_copy_string(mohinterpret, v->value, sizeof(mohinterpret));
01321    }
01322 
01323    ast_config_destroy(cfg);
01324    res = pipe(sndcmd);
01325    if (res) {
01326       ast_log(LOG_ERROR, "Unable to create pipe\n");
01327       return -1;
01328    }
01329    res = soundcard_init();
01330    if (res < 0) {
01331       if (option_verbose > 1) {
01332          ast_verbose(VERBOSE_PREFIX_2 "No sound card detected -- console channel will be unavailable\n");
01333          ast_verbose(VERBOSE_PREFIX_2 "Turn off ALSA support by adding 'noload=chan_alsa.so' in /etc/asterisk/modules.conf\n");
01334       }
01335       return AST_MODULE_LOAD_DECLINE;
01336    }
01337 
01338    res = ast_channel_register(&alsa_tech);
01339    if (res < 0) {
01340       ast_log(LOG_ERROR, "Unable to register channel class 'Console'\n");
01341       return -1;
01342    }
01343    ast_cli_register_multiple(cli_alsa, sizeof(cli_alsa) / sizeof(struct ast_cli_entry));
01344 
01345    ast_pthread_create_background(&sthread, NULL, sound_thread, NULL);
01346 #ifdef ALSA_MONITOR
01347    if (alsa_monitor_start())
01348       ast_log(LOG_ERROR, "Problem starting Monitoring\n");
01349 #endif
01350    return 0;
01351 }
01352 
01353 static int unload_module(void)
01354 {
01355    ast_channel_unregister(&alsa_tech);
01356    ast_cli_unregister_multiple(cli_alsa, sizeof(cli_alsa) / sizeof(struct ast_cli_entry));
01357 
01358    if (alsa.icard)
01359       snd_pcm_close(alsa.icard);
01360    if (alsa.ocard)
01361       snd_pcm_close(alsa.ocard);
01362    if (sndcmd[0] > 0) {
01363       close(sndcmd[0]);
01364       close(sndcmd[1]);
01365    }
01366    if (alsa.owner)
01367       ast_softhangup(alsa.owner, AST_SOFTHANGUP_APPUNLOAD);
01368    if (alsa.owner)
01369       return -1;
01370    return 0;
01371 }
01372 
01373 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "ALSA Console Channel Driver");

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