Wed Aug 18 22:33:44 2010

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: 249896 $")
00037 
00038 #include <fcntl.h>
00039 #include <sys/ioctl.h>
00040 #include <sys/time.h>
00041 
00042 #define ALSA_PCM_NEW_HW_PARAMS_API
00043 #define ALSA_PCM_NEW_SW_PARAMS_API
00044 #include <alsa/asoundlib.h>
00045 
00046 #include "asterisk/frame.h"
00047 #include "asterisk/channel.h"
00048 #include "asterisk/module.h"
00049 #include "asterisk/pbx.h"
00050 #include "asterisk/config.h"
00051 #include "asterisk/cli.h"
00052 #include "asterisk/utils.h"
00053 #include "asterisk/causes.h"
00054 #include "asterisk/endian.h"
00055 #include "asterisk/stringfields.h"
00056 #include "asterisk/abstract_jb.h"
00057 #include "asterisk/musiconhold.h"
00058 #include "asterisk/poll-compat.h"
00059 
00060 /*! Global jitterbuffer configuration - by default, jb is disabled */
00061 static struct ast_jb_conf default_jbconf = {
00062    .flags = 0,
00063    .max_size = -1,
00064    .resync_threshold = -1,
00065    .impl = "",
00066    .target_extra = -1,
00067 };
00068 static struct ast_jb_conf global_jbconf;
00069 
00070 #define DEBUG 0
00071 /* Which device to use */
00072 #define ALSA_INDEV "default"
00073 #define ALSA_OUTDEV "default"
00074 #define DESIRED_RATE 8000
00075 
00076 /* Lets use 160 sample frames, just like GSM.  */
00077 #define FRAME_SIZE 160
00078 #define PERIOD_FRAMES 80      /* 80 Frames, at 2 bytes each */
00079 
00080 /* When you set the frame size, you have to come up with
00081    the right buffer format as well. */
00082 /* 5 64-byte frames = one frame */
00083 #define BUFFER_FMT ((buffersize * 10) << 16) | (0x0006);
00084 
00085 /* Don't switch between read/write modes faster than every 300 ms */
00086 #define MIN_SWITCH_TIME 600
00087 
00088 #if __BYTE_ORDER == __LITTLE_ENDIAN
00089 static snd_pcm_format_t format = SND_PCM_FORMAT_S16_LE;
00090 #else
00091 static snd_pcm_format_t format = SND_PCM_FORMAT_S16_BE;
00092 #endif
00093 
00094 static char indevname[50] = ALSA_INDEV;
00095 static char outdevname[50] = ALSA_OUTDEV;
00096 
00097 static int silencesuppression = 0;
00098 static int silencethreshold = 1000;
00099 
00100 AST_MUTEX_DEFINE_STATIC(alsalock);
00101 
00102 static const char tdesc[] = "ALSA Console Channel Driver";
00103 static const char config[] = "alsa.conf";
00104 
00105 static char context[AST_MAX_CONTEXT] = "default";
00106 static char language[MAX_LANGUAGE] = "";
00107 static char exten[AST_MAX_EXTENSION] = "s";
00108 static char mohinterpret[MAX_MUSICCLASS];
00109 
00110 static int hookstate = 0;
00111 
00112 static struct chan_alsa_pvt {
00113    /* We only have one ALSA structure -- near sighted perhaps, but it
00114       keeps this driver as simple as possible -- as it should be. */
00115    struct ast_channel *owner;
00116    char exten[AST_MAX_EXTENSION];
00117    char context[AST_MAX_CONTEXT];
00118    snd_pcm_t *icard, *ocard;
00119 
00120 } alsa;
00121 
00122 /* Number of buffers...  Each is FRAMESIZE/8 ms long.  For example
00123    with 160 sample frames, and a buffer size of 3, we have a 60ms buffer, 
00124    usually plenty. */
00125 
00126 #define MAX_BUFFER_SIZE 100
00127 
00128 /* File descriptors for sound device */
00129 static int readdev = -1;
00130 static int writedev = -1;
00131 
00132 static int autoanswer = 1;
00133 
00134 static struct ast_channel *alsa_request(const char *type, int format, void *data, int *cause);
00135 static int alsa_digit(struct ast_channel *c, char digit, unsigned int duration);
00136 static int alsa_text(struct ast_channel *c, const char *text);
00137 static int alsa_hangup(struct ast_channel *c);
00138 static int alsa_answer(struct ast_channel *c);
00139 static struct ast_frame *alsa_read(struct ast_channel *chan);
00140 static int alsa_call(struct ast_channel *c, char *dest, int timeout);
00141 static int alsa_write(struct ast_channel *chan, struct ast_frame *f);
00142 static int alsa_indicate(struct ast_channel *chan, int cond, const void *data, size_t datalen);
00143 static int alsa_fixup(struct ast_channel *oldchan, struct ast_channel *newchan);
00144 
00145 static const struct ast_channel_tech alsa_tech = {
00146    .type = "Console",
00147    .description = tdesc,
00148    .capabilities = AST_FORMAT_SLINEAR,
00149    .requester = alsa_request,
00150    .send_digit_end = alsa_digit,
00151    .send_text = alsa_text,
00152    .hangup = alsa_hangup,
00153    .answer = alsa_answer,
00154    .read = alsa_read,
00155    .call = alsa_call,
00156    .write = alsa_write,
00157    .indicate = alsa_indicate,
00158    .fixup = alsa_fixup,
00159 };
00160 
00161 static snd_pcm_t *alsa_card_init(char *dev, snd_pcm_stream_t stream)
00162 {
00163    int err;
00164    int direction;
00165    snd_pcm_t *handle = NULL;
00166    snd_pcm_hw_params_t *hwparams = NULL;
00167    snd_pcm_sw_params_t *swparams = NULL;
00168    struct pollfd pfd;
00169    snd_pcm_uframes_t period_size = PERIOD_FRAMES * 4;
00170    snd_pcm_uframes_t buffer_size = 0;
00171    unsigned int rate = DESIRED_RATE;
00172    snd_pcm_uframes_t start_threshold, stop_threshold;
00173 
00174    err = snd_pcm_open(&handle, dev, stream, SND_PCM_NONBLOCK);
00175    if (err < 0) {
00176       ast_log(LOG_ERROR, "snd_pcm_open failed: %s\n", snd_strerror(err));
00177       return NULL;
00178    } else {
00179       ast_debug(1, "Opening device %s in %s mode\n", dev, (stream == SND_PCM_STREAM_CAPTURE) ? "read" : "write");
00180    }
00181 
00182    hwparams = alloca(snd_pcm_hw_params_sizeof());
00183    memset(hwparams, 0, snd_pcm_hw_params_sizeof());
00184    snd_pcm_hw_params_any(handle, hwparams);
00185 
00186    err = snd_pcm_hw_params_set_access(handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED);
00187    if (err < 0)
00188       ast_log(LOG_ERROR, "set_access failed: %s\n", snd_strerror(err));
00189 
00190    err = snd_pcm_hw_params_set_format(handle, hwparams, format);
00191    if (err < 0)
00192       ast_log(LOG_ERROR, "set_format failed: %s\n", snd_strerror(err));
00193 
00194    err = snd_pcm_hw_params_set_channels(handle, hwparams, 1);
00195    if (err < 0)
00196       ast_log(LOG_ERROR, "set_channels failed: %s\n", snd_strerror(err));
00197 
00198    direction = 0;
00199    err = snd_pcm_hw_params_set_rate_near(handle, hwparams, &rate, &direction);
00200    if (rate != DESIRED_RATE)
00201       ast_log(LOG_WARNING, "Rate not correct, requested %d, got %d\n", DESIRED_RATE, rate);
00202 
00203    direction = 0;
00204    err = snd_pcm_hw_params_set_period_size_near(handle, hwparams, &period_size, &direction);
00205    if (err < 0)
00206       ast_log(LOG_ERROR, "period_size(%ld frames) is bad: %s\n", period_size, snd_strerror(err));
00207    else {
00208       ast_debug(1, "Period size is %d\n", err);
00209    }
00210 
00211    buffer_size = 4096 * 2;    /* period_size * 16; */
00212    err = snd_pcm_hw_params_set_buffer_size_near(handle, hwparams, &buffer_size);
00213    if (err < 0)
00214       ast_log(LOG_WARNING, "Problem setting buffer size of %ld: %s\n", buffer_size, snd_strerror(err));
00215    else {
00216       ast_debug(1, "Buffer size is set to %d frames\n", err);
00217    }
00218 
00219    err = snd_pcm_hw_params(handle, hwparams);
00220    if (err < 0)
00221       ast_log(LOG_ERROR, "Couldn't set the new hw params: %s\n", snd_strerror(err));
00222 
00223    swparams = alloca(snd_pcm_sw_params_sizeof());
00224    memset(swparams, 0, snd_pcm_sw_params_sizeof());
00225    snd_pcm_sw_params_current(handle, swparams);
00226 
00227    if (stream == SND_PCM_STREAM_PLAYBACK)
00228       start_threshold = period_size;
00229    else
00230       start_threshold = 1;
00231 
00232    err = snd_pcm_sw_params_set_start_threshold(handle, swparams, start_threshold);
00233    if (err < 0)
00234       ast_log(LOG_ERROR, "start threshold: %s\n", snd_strerror(err));
00235 
00236    if (stream == SND_PCM_STREAM_PLAYBACK)
00237       stop_threshold = buffer_size;
00238    else
00239       stop_threshold = buffer_size;
00240 
00241    err = snd_pcm_sw_params_set_stop_threshold(handle, swparams, stop_threshold);
00242    if (err < 0)
00243       ast_log(LOG_ERROR, "stop threshold: %s\n", snd_strerror(err));
00244 
00245    err = snd_pcm_sw_params(handle, swparams);
00246    if (err < 0)
00247       ast_log(LOG_ERROR, "sw_params: %s\n", snd_strerror(err));
00248 
00249    err = snd_pcm_poll_descriptors_count(handle);
00250    if (err <= 0)
00251       ast_log(LOG_ERROR, "Unable to get a poll descriptors count, error is %s\n", snd_strerror(err));
00252    if (err != 1) {
00253       ast_debug(1, "Can't handle more than one device\n");
00254    }
00255 
00256    snd_pcm_poll_descriptors(handle, &pfd, err);
00257    ast_debug(1, "Acquired fd %d from the poll descriptor\n", pfd.fd);
00258 
00259    if (stream == SND_PCM_STREAM_CAPTURE)
00260       readdev = pfd.fd;
00261    else
00262       writedev = pfd.fd;
00263 
00264    return handle;
00265 }
00266 
00267 static int soundcard_init(void)
00268 {
00269    alsa.icard = alsa_card_init(indevname, SND_PCM_STREAM_CAPTURE);
00270    alsa.ocard = alsa_card_init(outdevname, SND_PCM_STREAM_PLAYBACK);
00271 
00272    if (!alsa.icard || !alsa.ocard) {
00273       ast_log(LOG_ERROR, "Problem opening ALSA I/O devices\n");
00274       return -1;
00275    }
00276 
00277    return readdev;
00278 }
00279 
00280 static int alsa_digit(struct ast_channel *c, char digit, unsigned int duration)
00281 {
00282    ast_mutex_lock(&alsalock);
00283    ast_verbose(" << Console Received digit %c of duration %u ms >> \n", 
00284       digit, duration);
00285    ast_mutex_unlock(&alsalock);
00286 
00287    return 0;
00288 }
00289 
00290 static int alsa_text(struct ast_channel *c, const char *text)
00291 {
00292    ast_mutex_lock(&alsalock);
00293    ast_verbose(" << Console Received text %s >> \n", text);
00294    ast_mutex_unlock(&alsalock);
00295 
00296    return 0;
00297 }
00298 
00299 static void grab_owner(void)
00300 {
00301    while (alsa.owner && ast_channel_trylock(alsa.owner)) {
00302       DEADLOCK_AVOIDANCE(&alsalock);
00303    }
00304 }
00305 
00306 static int alsa_call(struct ast_channel *c, char *dest, int timeout)
00307 {
00308    struct ast_frame f = { AST_FRAME_CONTROL };
00309 
00310    ast_mutex_lock(&alsalock);
00311    ast_verbose(" << Call placed to '%s' on console >> \n", dest);
00312    if (autoanswer) {
00313       ast_verbose(" << Auto-answered >> \n");
00314       grab_owner();
00315       if (alsa.owner) {
00316          f.subclass = AST_CONTROL_ANSWER;
00317          ast_queue_frame(alsa.owner, &f);
00318          ast_channel_unlock(alsa.owner);
00319       }
00320    } else {
00321       ast_verbose(" << Type 'answer' to answer, or use 'autoanswer' for future calls >> \n");
00322       grab_owner();
00323       if (alsa.owner) {
00324          f.subclass = AST_CONTROL_RINGING;
00325          ast_queue_frame(alsa.owner, &f);
00326          ast_channel_unlock(alsa.owner);
00327          ast_indicate(alsa.owner, AST_CONTROL_RINGING);
00328       }
00329    }
00330    snd_pcm_prepare(alsa.icard);
00331    snd_pcm_start(alsa.icard);
00332    ast_mutex_unlock(&alsalock);
00333 
00334    return 0;
00335 }
00336 
00337 static int alsa_answer(struct ast_channel *c)
00338 {
00339    ast_mutex_lock(&alsalock);
00340    ast_verbose(" << Console call has been answered >> \n");
00341    ast_setstate(c, AST_STATE_UP);
00342    snd_pcm_prepare(alsa.icard);
00343    snd_pcm_start(alsa.icard);
00344    ast_mutex_unlock(&alsalock);
00345 
00346    return 0;
00347 }
00348 
00349 static int alsa_hangup(struct ast_channel *c)
00350 {
00351    ast_mutex_lock(&alsalock);
00352    c->tech_pvt = NULL;
00353    alsa.owner = NULL;
00354    ast_verbose(" << Hangup on console >> \n");
00355    ast_module_unref(ast_module_info->self);
00356    hookstate = 0;
00357    snd_pcm_drop(alsa.icard);
00358    ast_mutex_unlock(&alsalock);
00359 
00360    return 0;
00361 }
00362 
00363 static int alsa_write(struct ast_channel *chan, struct ast_frame *f)
00364 {
00365    static char sizbuf[8000];
00366    static int sizpos = 0;
00367    int len = sizpos;
00368    int pos;
00369    int res = 0;
00370    /* size_t frames = 0; */
00371    snd_pcm_state_t state;
00372 
00373    ast_mutex_lock(&alsalock);
00374 
00375    /* We have to digest the frame in 160-byte portions */
00376    if (f->datalen > sizeof(sizbuf) - sizpos) {
00377       ast_log(LOG_WARNING, "Frame too large\n");
00378       res = -1;
00379    } else {
00380       memcpy(sizbuf + sizpos, f->data.ptr, f->datalen);
00381       len += f->datalen;
00382       pos = 0;
00383       state = snd_pcm_state(alsa.ocard);
00384       if (state == SND_PCM_STATE_XRUN)
00385          snd_pcm_prepare(alsa.ocard);
00386       while ((res = snd_pcm_writei(alsa.ocard, sizbuf, len / 2)) == -EAGAIN) {
00387          usleep(1);
00388       }
00389       if (res == -EPIPE) {
00390 #if DEBUG
00391          ast_debug(1, "XRUN write\n");
00392 #endif
00393          snd_pcm_prepare(alsa.ocard);
00394          while ((res = snd_pcm_writei(alsa.ocard, sizbuf, len / 2)) == -EAGAIN) {
00395             usleep(1);
00396          }
00397          if (res != len / 2) {
00398             ast_log(LOG_ERROR, "Write error: %s\n", snd_strerror(res));
00399             res = -1;
00400          } else if (res < 0) {
00401             ast_log(LOG_ERROR, "Write error %s\n", snd_strerror(res));
00402             res = -1;
00403          }
00404       } else {
00405          if (res == -ESTRPIPE)
00406             ast_log(LOG_ERROR, "You've got some big problems\n");
00407          else if (res < 0)
00408             ast_log(LOG_NOTICE, "Error %d on write\n", res);
00409       }
00410    }
00411    ast_mutex_unlock(&alsalock);
00412 
00413    return res >= 0 ? 0 : res;
00414 }
00415 
00416 
00417 static struct ast_frame *alsa_read(struct ast_channel *chan)
00418 {
00419    static struct ast_frame f;
00420    static short __buf[FRAME_SIZE + AST_FRIENDLY_OFFSET / 2];
00421    short *buf;
00422    static int readpos = 0;
00423    static int left = FRAME_SIZE;
00424    snd_pcm_state_t state;
00425    int r = 0;
00426    int off = 0;
00427 
00428    ast_mutex_lock(&alsalock);
00429    f.frametype = AST_FRAME_NULL;
00430    f.subclass = 0;
00431    f.samples = 0;
00432    f.datalen = 0;
00433    f.data.ptr = NULL;
00434    f.offset = 0;
00435    f.src = "Console";
00436    f.mallocd = 0;
00437    f.delivery.tv_sec = 0;
00438    f.delivery.tv_usec = 0;
00439 
00440    state = snd_pcm_state(alsa.icard);
00441    if ((state != SND_PCM_STATE_PREPARED) && (state != SND_PCM_STATE_RUNNING)) {
00442       snd_pcm_prepare(alsa.icard);
00443    }
00444 
00445    buf = __buf + AST_FRIENDLY_OFFSET / 2;
00446 
00447    r = snd_pcm_readi(alsa.icard, buf + readpos, left);
00448    if (r == -EPIPE) {
00449 #if DEBUG
00450       ast_log(LOG_ERROR, "XRUN read\n");
00451 #endif
00452       snd_pcm_prepare(alsa.icard);
00453    } else if (r == -ESTRPIPE) {
00454       ast_log(LOG_ERROR, "-ESTRPIPE\n");
00455       snd_pcm_prepare(alsa.icard);
00456    } else if (r < 0) {
00457       ast_log(LOG_ERROR, "Read error: %s\n", snd_strerror(r));
00458    } else if (r >= 0) {
00459       off -= r;
00460    }
00461    /* Update positions */
00462    readpos += r;
00463    left -= r;
00464 
00465    if (readpos >= FRAME_SIZE) {
00466       /* A real frame */
00467       readpos = 0;
00468       left = FRAME_SIZE;
00469       if (chan->_state != AST_STATE_UP) {
00470          /* Don't transmit unless it's up */
00471          ast_mutex_unlock(&alsalock);
00472          return &f;
00473       }
00474       f.frametype = AST_FRAME_VOICE;
00475       f.subclass = AST_FORMAT_SLINEAR;
00476       f.samples = FRAME_SIZE;
00477       f.datalen = FRAME_SIZE * 2;
00478       f.data.ptr = buf;
00479       f.offset = AST_FRIENDLY_OFFSET;
00480       f.src = "Console";
00481       f.mallocd = 0;
00482 
00483    }
00484    ast_mutex_unlock(&alsalock);
00485 
00486    return &f;
00487 }
00488 
00489 static int alsa_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
00490 {
00491    struct chan_alsa_pvt *p = newchan->tech_pvt;
00492 
00493    ast_mutex_lock(&alsalock);
00494    p->owner = newchan;
00495    ast_mutex_unlock(&alsalock);
00496 
00497    return 0;
00498 }
00499 
00500 static int alsa_indicate(struct ast_channel *chan, int cond, const void *data, size_t datalen)
00501 {
00502    int res = 0;
00503 
00504    ast_mutex_lock(&alsalock);
00505 
00506    switch (cond) {
00507    case AST_CONTROL_BUSY:
00508    case AST_CONTROL_CONGESTION:
00509    case AST_CONTROL_RINGING:
00510    case -1:
00511       res = -1;  /* Ask for inband indications */
00512       break;
00513    case AST_CONTROL_PROGRESS:
00514    case AST_CONTROL_PROCEEDING:
00515    case AST_CONTROL_VIDUPDATE:
00516    case AST_CONTROL_SRCUPDATE:
00517       break;
00518    case AST_CONTROL_HOLD:
00519       ast_verbose(" << Console Has Been Placed on Hold >> \n");
00520       ast_moh_start(chan, data, mohinterpret);
00521       break;
00522    case AST_CONTROL_UNHOLD:
00523       ast_verbose(" << Console Has Been Retrieved from Hold >> \n");
00524       ast_moh_stop(chan);
00525       break;
00526    default:
00527       ast_log(LOG_WARNING, "Don't know how to display condition %d on %s\n", cond, chan->name);
00528       res = -1;
00529    }
00530 
00531    ast_mutex_unlock(&alsalock);
00532 
00533    return res;
00534 }
00535 
00536 static struct ast_channel *alsa_new(struct chan_alsa_pvt *p, int state)
00537 {
00538    struct ast_channel *tmp = NULL;
00539 
00540    if (!(tmp = ast_channel_alloc(1, state, 0, 0, "", p->exten, p->context, 0, "ALSA/%s", indevname)))
00541       return NULL;
00542 
00543    tmp->tech = &alsa_tech;
00544    ast_channel_set_fd(tmp, 0, readdev);
00545    tmp->nativeformats = AST_FORMAT_SLINEAR;
00546    tmp->readformat = AST_FORMAT_SLINEAR;
00547    tmp->writeformat = AST_FORMAT_SLINEAR;
00548    tmp->tech_pvt = p;
00549    if (!ast_strlen_zero(p->context))
00550       ast_copy_string(tmp->context, p->context, sizeof(tmp->context));
00551    if (!ast_strlen_zero(p->exten))
00552       ast_copy_string(tmp->exten, p->exten, sizeof(tmp->exten));
00553    if (!ast_strlen_zero(language))
00554       ast_string_field_set(tmp, language, language);
00555    p->owner = tmp;
00556    ast_module_ref(ast_module_info->self);
00557    ast_jb_configure(tmp, &global_jbconf);
00558    if (state != AST_STATE_DOWN) {
00559       if (ast_pbx_start(tmp)) {
00560          ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name);
00561          ast_hangup(tmp);
00562          tmp = NULL;
00563       }
00564    }
00565 
00566    return tmp;
00567 }
00568 
00569 static struct ast_channel *alsa_request(const char *type, int fmt, void *data, int *cause)
00570 {
00571    int oldformat = fmt;
00572    struct ast_channel *tmp = NULL;
00573 
00574    if (!(fmt &= AST_FORMAT_SLINEAR)) {
00575       ast_log(LOG_NOTICE, "Asked to get a channel of format '%d'\n", oldformat);
00576       return NULL;
00577    }
00578 
00579    ast_mutex_lock(&alsalock);
00580 
00581    if (alsa.owner) {
00582       ast_log(LOG_NOTICE, "Already have a call on the ALSA channel\n");
00583       *cause = AST_CAUSE_BUSY;
00584    } else if (!(tmp = alsa_new(&alsa, AST_STATE_DOWN))) {
00585       ast_log(LOG_WARNING, "Unable to create new ALSA channel\n");
00586    }
00587 
00588    ast_mutex_unlock(&alsalock);
00589 
00590    return tmp;
00591 }
00592 
00593 static char *autoanswer_complete(const char *line, const char *word, int pos, int state)
00594 {
00595    switch (state) {
00596       case 0:
00597          if (!ast_strlen_zero(word) && !strncasecmp(word, "on", MIN(strlen(word), 2)))
00598             return ast_strdup("on");
00599       case 1:
00600          if (!ast_strlen_zero(word) && !strncasecmp(word, "off", MIN(strlen(word), 3)))
00601             return ast_strdup("off");
00602       default:
00603          return NULL;
00604    }
00605 
00606    return NULL;
00607 }
00608 
00609 static char *console_autoanswer(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00610 {
00611    char *res = CLI_SUCCESS;
00612 
00613    switch (cmd) {
00614    case CLI_INIT:
00615       e->command = "console autoanswer";
00616       e->usage =
00617          "Usage: console autoanswer [on|off]\n"
00618          "       Enables or disables autoanswer feature.  If used without\n"
00619          "       argument, displays the current on/off status of autoanswer.\n"
00620          "       The default value of autoanswer is in 'alsa.conf'.\n";
00621       return NULL;
00622    case CLI_GENERATE:
00623       return autoanswer_complete(a->line, a->word, a->pos, a->n);
00624    }
00625 
00626    if ((a->argc != 2) && (a->argc != 3))
00627       return CLI_SHOWUSAGE;
00628 
00629    ast_mutex_lock(&alsalock);
00630    if (a->argc == 2) {
00631       ast_cli(a->fd, "Auto answer is %s.\n", autoanswer ? "on" : "off");
00632    } else {
00633       if (!strcasecmp(a->argv[2], "on"))
00634          autoanswer = -1;
00635       else if (!strcasecmp(a->argv[2], "off"))
00636          autoanswer = 0;
00637       else
00638          res = CLI_SHOWUSAGE;
00639    }
00640    ast_mutex_unlock(&alsalock);
00641 
00642    return res;
00643 }
00644 
00645 static char *console_answer(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00646 {
00647    char *res = CLI_SUCCESS;
00648 
00649    switch (cmd) {
00650    case CLI_INIT:
00651       e->command = "console answer";
00652       e->usage =
00653          "Usage: console answer\n"
00654          "       Answers an incoming call on the console (ALSA) channel.\n";
00655 
00656       return NULL;
00657    case CLI_GENERATE:
00658       return NULL; 
00659    }
00660 
00661    if (a->argc != 2)
00662       return CLI_SHOWUSAGE;
00663 
00664    ast_mutex_lock(&alsalock);
00665 
00666    if (!alsa.owner) {
00667       ast_cli(a->fd, "No one is calling us\n");
00668       res = CLI_FAILURE;
00669    } else {
00670       hookstate = 1;
00671       grab_owner();
00672       if (alsa.owner) {
00673          struct ast_frame f = { AST_FRAME_CONTROL, AST_CONTROL_ANSWER };
00674 
00675          ast_queue_frame(alsa.owner, &f);
00676          ast_channel_unlock(alsa.owner);
00677       }
00678    }
00679 
00680    snd_pcm_prepare(alsa.icard);
00681    snd_pcm_start(alsa.icard);
00682 
00683    ast_mutex_unlock(&alsalock);
00684 
00685    return res;
00686 }
00687 
00688 static char *console_sendtext(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00689 {
00690    int tmparg = 3;
00691    char *res = CLI_SUCCESS;
00692 
00693    switch (cmd) {
00694    case CLI_INIT:
00695       e->command = "console send text";
00696       e->usage =
00697          "Usage: console send text <message>\n"
00698          "       Sends a text message for display on the remote terminal.\n";
00699       return NULL;
00700    case CLI_GENERATE:
00701       return NULL; 
00702    }
00703 
00704    if (a->argc < 3)
00705       return CLI_SHOWUSAGE;
00706 
00707    ast_mutex_lock(&alsalock);
00708 
00709    if (!alsa.owner) {
00710       ast_cli(a->fd, "No channel active\n");
00711       res = CLI_FAILURE;
00712    } else {
00713       struct ast_frame f = { AST_FRAME_TEXT, 0 };
00714       char text2send[256] = "";
00715 
00716       while (tmparg < a->argc) {
00717          strncat(text2send, a->argv[tmparg++], sizeof(text2send) - strlen(text2send) - 1);
00718          strncat(text2send, " ", sizeof(text2send) - strlen(text2send) - 1);
00719       }
00720 
00721       text2send[strlen(text2send) - 1] = '\n';
00722       f.data.ptr = text2send;
00723       f.datalen = strlen(text2send) + 1;
00724       grab_owner();
00725       if (alsa.owner) {
00726          ast_queue_frame(alsa.owner, &f);
00727          f.frametype = AST_FRAME_CONTROL;
00728          f.subclass = AST_CONTROL_ANSWER;
00729          f.data.ptr = NULL;
00730          f.datalen = 0;
00731          ast_queue_frame(alsa.owner, &f);
00732          ast_channel_unlock(alsa.owner);
00733       }
00734    }
00735 
00736    ast_mutex_unlock(&alsalock);
00737 
00738    return res;
00739 }
00740 
00741 static char *console_hangup(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00742 {
00743    char *res = CLI_SUCCESS;
00744 
00745    switch (cmd) {
00746    case CLI_INIT:
00747       e->command = "console hangup";
00748       e->usage =
00749          "Usage: console hangup\n"
00750          "       Hangs up any call currently placed on the console.\n";
00751       return NULL;
00752    case CLI_GENERATE:
00753       return NULL; 
00754    }
00755  
00756 
00757    if (a->argc != 2)
00758       return CLI_SHOWUSAGE;
00759 
00760    ast_mutex_lock(&alsalock);
00761 
00762    if (!alsa.owner && !hookstate) {
00763       ast_cli(a->fd, "No call to hangup\n");
00764       res = CLI_FAILURE;
00765    } else {
00766       hookstate = 0;
00767       grab_owner();
00768       if (alsa.owner) {
00769          ast_queue_hangup_with_cause(alsa.owner, AST_CAUSE_NORMAL_CLEARING);
00770          ast_channel_unlock(alsa.owner);
00771       }
00772    }
00773 
00774    ast_mutex_unlock(&alsalock);
00775 
00776    return res;
00777 }
00778 
00779 static char *console_dial(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00780 {
00781    char tmp[256], *tmp2;
00782    char *mye, *myc;
00783    char *d;
00784    char *res = CLI_SUCCESS;
00785 
00786    switch (cmd) {
00787    case CLI_INIT:
00788       e->command = "console dial";
00789       e->usage =
00790          "Usage: console dial [extension[@context]]\n"
00791          "       Dials a given extension (and context if specified)\n";
00792       return NULL;
00793    case CLI_GENERATE:
00794       return NULL;
00795    }
00796 
00797    if ((a->argc != 2) && (a->argc != 3))
00798       return CLI_SHOWUSAGE;
00799 
00800    ast_mutex_lock(&alsalock);
00801 
00802    if (alsa.owner) {
00803       if (a->argc == 3) {
00804          if (alsa.owner) {
00805             for (d = a->argv[2]; *d; d++) {
00806                struct ast_frame f = { .frametype = AST_FRAME_DTMF, .subclass = *d };
00807 
00808                ast_queue_frame(alsa.owner, &f);
00809             }
00810          }
00811       } else {
00812          ast_cli(a->fd, "You're already in a call.  You can use this only to dial digits until you hangup\n");
00813          res = CLI_FAILURE;
00814       }
00815    } else {
00816       mye = exten;
00817       myc = context;
00818       if (a->argc == 3) {
00819          char *stringp = NULL;
00820 
00821          ast_copy_string(tmp, a->argv[2], sizeof(tmp));
00822          stringp = tmp;
00823          strsep(&stringp, "@");
00824          tmp2 = strsep(&stringp, "@");
00825          if (!ast_strlen_zero(tmp))
00826             mye = tmp;
00827          if (!ast_strlen_zero(tmp2))
00828             myc = tmp2;
00829       }
00830       if (ast_exists_extension(NULL, myc, mye, 1, NULL)) {
00831          ast_copy_string(alsa.exten, mye, sizeof(alsa.exten));
00832          ast_copy_string(alsa.context, myc, sizeof(alsa.context));
00833          hookstate = 1;
00834          alsa_new(&alsa, AST_STATE_RINGING);
00835       } else
00836          ast_cli(a->fd, "No such extension '%s' in context '%s'\n", mye, myc);
00837    }
00838 
00839    ast_mutex_unlock(&alsalock);
00840 
00841    return res;
00842 }
00843 
00844 static struct ast_cli_entry cli_alsa[] = {
00845    AST_CLI_DEFINE(console_answer, "Answer an incoming console call"),
00846    AST_CLI_DEFINE(console_hangup, "Hangup a call on the console"),
00847    AST_CLI_DEFINE(console_dial, "Dial an extension on the console"),
00848    AST_CLI_DEFINE(console_sendtext, "Send text to the remote device"),
00849    AST_CLI_DEFINE(console_autoanswer, "Sets/displays autoanswer"),
00850 };
00851 
00852 static int load_module(void)
00853 {
00854    struct ast_config *cfg;
00855    struct ast_variable *v;
00856    struct ast_flags config_flags = { 0 };
00857 
00858    /* Copy the default jb config over global_jbconf */
00859    memcpy(&global_jbconf, &default_jbconf, sizeof(struct ast_jb_conf));
00860 
00861    strcpy(mohinterpret, "default");
00862 
00863    if (!(cfg = ast_config_load(config, config_flags))) {
00864       ast_log(LOG_ERROR, "Unable to read ALSA configuration file %s.  Aborting.\n", config);
00865       return AST_MODULE_LOAD_DECLINE;
00866    }
00867 
00868    v = ast_variable_browse(cfg, "general");
00869    for (; v; v = v->next) {
00870       /* handle jb conf */
00871       if (!ast_jb_read_conf(&global_jbconf, v->name, v->value))
00872             continue;
00873       
00874       if (!strcasecmp(v->name, "autoanswer"))
00875          autoanswer = ast_true(v->value);
00876       else if (!strcasecmp(v->name, "silencesuppression"))
00877          silencesuppression = ast_true(v->value);
00878       else if (!strcasecmp(v->name, "silencethreshold"))
00879          silencethreshold = atoi(v->value);
00880       else if (!strcasecmp(v->name, "context"))
00881          ast_copy_string(context, v->value, sizeof(context));
00882       else if (!strcasecmp(v->name, "language"))
00883          ast_copy_string(language, v->value, sizeof(language));
00884       else if (!strcasecmp(v->name, "extension"))
00885          ast_copy_string(exten, v->value, sizeof(exten));
00886       else if (!strcasecmp(v->name, "input_device"))
00887          ast_copy_string(indevname, v->value, sizeof(indevname));
00888       else if (!strcasecmp(v->name, "output_device"))
00889          ast_copy_string(outdevname, v->value, sizeof(outdevname));
00890       else if (!strcasecmp(v->name, "mohinterpret"))
00891          ast_copy_string(mohinterpret, v->value, sizeof(mohinterpret));
00892    }
00893    ast_config_destroy(cfg);
00894 
00895    if (soundcard_init() < 0) {
00896       ast_verb(2, "No sound card detected -- console channel will be unavailable\n");
00897       ast_verb(2, "Turn off ALSA support by adding 'noload=chan_alsa.so' in /etc/asterisk/modules.conf\n");
00898       return AST_MODULE_LOAD_DECLINE;
00899    }
00900 
00901    if (ast_channel_register(&alsa_tech)) {
00902       ast_log(LOG_ERROR, "Unable to register channel class 'Console'\n");
00903       return AST_MODULE_LOAD_FAILURE;
00904    }
00905 
00906    ast_cli_register_multiple(cli_alsa, sizeof(cli_alsa) / sizeof(struct ast_cli_entry));
00907 
00908    return AST_MODULE_LOAD_SUCCESS;
00909 }
00910 
00911 static int unload_module(void)
00912 {
00913    ast_channel_unregister(&alsa_tech);
00914    ast_cli_unregister_multiple(cli_alsa, sizeof(cli_alsa) / sizeof(struct ast_cli_entry));
00915 
00916    if (alsa.icard)
00917       snd_pcm_close(alsa.icard);
00918    if (alsa.ocard)
00919       snd_pcm_close(alsa.ocard);
00920    if (alsa.owner)
00921       ast_softhangup(alsa.owner, AST_SOFTHANGUP_APPUNLOAD);
00922    if (alsa.owner)
00923       return -1;
00924 
00925    return 0;
00926 }
00927 
00928 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "ALSA Console Channel Driver");

Generated on Wed Aug 18 22:33:44 2010 for Asterisk - the Open Source PBX by  doxygen 1.4.7