Wed Oct 28 11:45:29 2009

Asterisk developer's documentation


chan_alsa.c

Go to the documentation of this file.
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: 196989 $")
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 };
00067 static struct ast_jb_conf global_jbconf;
00068 
00069 #define DEBUG 0
00070 /* Which device to use */
00071 #define ALSA_INDEV "default"
00072 #define ALSA_OUTDEV "default"
00073 #define DESIRED_RATE 8000
00074 
00075 /* Lets use 160 sample frames, just like GSM.  */
00076 #define FRAME_SIZE 160
00077 #define PERIOD_FRAMES 80      /* 80 Frames, at 2 bytes each */
00078 
00079 /* When you set the frame size, you have to come up with
00080    the right buffer format as well. */
00081 /* 5 64-byte frames = one frame */
00082 #define BUFFER_FMT ((buffersize * 10) << 16) | (0x0006);
00083 
00084 /* Don't switch between read/write modes faster than every 300 ms */
00085 #define MIN_SWITCH_TIME 600
00086 
00087 #if __BYTE_ORDER == __LITTLE_ENDIAN
00088 static snd_pcm_format_t format = SND_PCM_FORMAT_S16_LE;
00089 #else
00090 static snd_pcm_format_t format = SND_PCM_FORMAT_S16_BE;
00091 #endif
00092 
00093 static char indevname[50] = ALSA_INDEV;
00094 static char outdevname[50] = ALSA_OUTDEV;
00095 
00096 static int silencesuppression = 0;
00097 static int silencethreshold = 1000;
00098 
00099 AST_MUTEX_DEFINE_STATIC(alsalock);
00100 
00101 static const char tdesc[] = "ALSA Console Channel Driver";
00102 static const char config[] = "alsa.conf";
00103 
00104 static char context[AST_MAX_CONTEXT] = "default";
00105 static char language[MAX_LANGUAGE] = "";
00106 static char exten[AST_MAX_EXTENSION] = "s";
00107 static char mohinterpret[MAX_MUSICCLASS];
00108 
00109 static int hookstate = 0;
00110 
00111 static struct chan_alsa_pvt {
00112    /* We only have one ALSA structure -- near sighted perhaps, but it
00113       keeps this driver as simple as possible -- as it should be. */
00114    struct ast_channel *owner;
00115    char exten[AST_MAX_EXTENSION];
00116    char context[AST_MAX_CONTEXT];
00117    snd_pcm_t *icard, *ocard;
00118 
00119 } alsa;
00120 
00121 /* Number of buffers...  Each is FRAMESIZE/8 ms long.  For example
00122    with 160 sample frames, and a buffer size of 3, we have a 60ms buffer, 
00123    usually plenty. */
00124 
00125 #define MAX_BUFFER_SIZE 100
00126 
00127 /* File descriptors for sound device */
00128 static int readdev = -1;
00129 static int writedev = -1;
00130 
00131 static int autoanswer = 1;
00132 
00133 static struct ast_channel *alsa_request(const char *type, int format, void *data, int *cause);
00134 static int alsa_digit(struct ast_channel *c, char digit, unsigned int duration);
00135 static int alsa_text(struct ast_channel *c, const char *text);
00136 static int alsa_hangup(struct ast_channel *c);
00137 static int alsa_answer(struct ast_channel *c);
00138 static struct ast_frame *alsa_read(struct ast_channel *chan);
00139 static int alsa_call(struct ast_channel *c, char *dest, int timeout);
00140 static int alsa_write(struct ast_channel *chan, struct ast_frame *f);
00141 static int alsa_indicate(struct ast_channel *chan, int cond, const void *data, size_t datalen);
00142 static int alsa_fixup(struct ast_channel *oldchan, struct ast_channel *newchan);
00143 
00144 static const struct ast_channel_tech alsa_tech = {
00145    .type = "Console",
00146    .description = tdesc,
00147    .capabilities = AST_FORMAT_SLINEAR,
00148    .requester = alsa_request,
00149    .send_digit_end = alsa_digit,
00150    .send_text = alsa_text,
00151    .hangup = alsa_hangup,
00152    .answer = alsa_answer,
00153    .read = alsa_read,
00154    .call = alsa_call,
00155    .write = alsa_write,
00156    .indicate = alsa_indicate,
00157    .fixup = alsa_fixup,
00158 };
00159 
00160 static snd_pcm_t *alsa_card_init(char *dev, snd_pcm_stream_t stream)
00161 {
00162    int err;
00163    int direction;
00164    snd_pcm_t *handle = NULL;
00165    snd_pcm_hw_params_t *hwparams = NULL;
00166    snd_pcm_sw_params_t *swparams = NULL;
00167    struct pollfd pfd;
00168    snd_pcm_uframes_t period_size = PERIOD_FRAMES * 4;
00169    snd_pcm_uframes_t buffer_size = 0;
00170    unsigned int rate = DESIRED_RATE;
00171    snd_pcm_uframes_t start_threshold, stop_threshold;
00172 
00173    err = snd_pcm_open(&handle, dev, stream, SND_PCM_NONBLOCK);
00174    if (err < 0) {
00175       ast_log(LOG_ERROR, "snd_pcm_open failed: %s\n", snd_strerror(err));
00176       return NULL;
00177    } else {
00178       ast_debug(1, "Opening device %s in %s mode\n", dev, (stream == SND_PCM_STREAM_CAPTURE) ? "read" : "write");
00179    }
00180 
00181    hwparams = alloca(snd_pcm_hw_params_sizeof());
00182    memset(hwparams, 0, snd_pcm_hw_params_sizeof());
00183    snd_pcm_hw_params_any(handle, hwparams);
00184 
00185    err = snd_pcm_hw_params_set_access(handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED);
00186    if (err < 0)
00187       ast_log(LOG_ERROR, "set_access failed: %s\n", snd_strerror(err));
00188 
00189    err = snd_pcm_hw_params_set_format(handle, hwparams, format);
00190    if (err < 0)
00191       ast_log(LOG_ERROR, "set_format failed: %s\n", snd_strerror(err));
00192 
00193    err = snd_pcm_hw_params_set_channels(handle, hwparams, 1);
00194    if (err < 0)
00195       ast_log(LOG_ERROR, "set_channels failed: %s\n", snd_strerror(err));
00196 
00197    direction = 0;
00198    err = snd_pcm_hw_params_set_rate_near(handle, hwparams, &rate, &direction);
00199    if (rate != DESIRED_RATE)
00200       ast_log(LOG_WARNING, "Rate not correct, requested %d, got %d\n", DESIRED_RATE, rate);
00201 
00202    direction = 0;
00203    err = snd_pcm_hw_params_set_period_size_near(handle, hwparams, &period_size, &direction);
00204    if (err < 0)
00205       ast_log(LOG_ERROR, "period_size(%ld frames) is bad: %s\n", period_size, snd_strerror(err));
00206    else {
00207       ast_debug(1, "Period size is %d\n", err);
00208    }
00209 
00210    buffer_size = 4096 * 2;    /* period_size * 16; */
00211    err = snd_pcm_hw_params_set_buffer_size_near(handle, hwparams, &buffer_size);
00212    if (err < 0)
00213       ast_log(LOG_WARNING, "Problem setting buffer size of %ld: %s\n", buffer_size, snd_strerror(err));
00214    else {
00215       ast_debug(1, "Buffer size is set to %d frames\n", err);
00216    }
00217 
00218    err = snd_pcm_hw_params(handle, hwparams);
00219    if (err < 0)
00220       ast_log(LOG_ERROR, "Couldn't set the new hw params: %s\n", snd_strerror(err));
00221 
00222    swparams = alloca(snd_pcm_sw_params_sizeof());
00223    memset(swparams, 0, snd_pcm_sw_params_sizeof());
00224    snd_pcm_sw_params_current(handle, swparams);
00225 
00226    if (stream == SND_PCM_STREAM_PLAYBACK)
00227       start_threshold = period_size;
00228    else
00229       start_threshold = 1;
00230 
00231    err = snd_pcm_sw_params_set_start_threshold(handle, swparams, start_threshold);
00232    if (err < 0)
00233       ast_log(LOG_ERROR, "start threshold: %s\n", snd_strerror(err));
00234 
00235    if (stream == SND_PCM_STREAM_PLAYBACK)
00236       stop_threshold = buffer_size;
00237    else
00238       stop_threshold = buffer_size;
00239 
00240    err = snd_pcm_sw_params_set_stop_threshold(handle, swparams, stop_threshold);
00241    if (err < 0)
00242       ast_log(LOG_ERROR, "stop threshold: %s\n", snd_strerror(err));
00243 
00244    err = snd_pcm_sw_params(handle, swparams);
00245    if (err < 0)
00246       ast_log(LOG_ERROR, "sw_params: %s\n", snd_strerror(err));
00247 
00248    err = snd_pcm_poll_descriptors_count(handle);
00249    if (err <= 0)
00250       ast_log(LOG_ERROR, "Unable to get a poll descriptors count, error is %s\n", snd_strerror(err));
00251    if (err != 1) {
00252       ast_debug(1, "Can't handle more than one device\n");
00253    }
00254 
00255    snd_pcm_poll_descriptors(handle, &pfd, err);
00256    ast_debug(1, "Acquired fd %d from the poll descriptor\n", pfd.fd);
00257 
00258    if (stream == SND_PCM_STREAM_CAPTURE)
00259       readdev = pfd.fd;
00260    else
00261       writedev = pfd.fd;
00262 
00263    return handle;
00264 }
00265 
00266 static int soundcard_init(void)
00267 {
00268    alsa.icard = alsa_card_init(indevname, SND_PCM_STREAM_CAPTURE);
00269    alsa.ocard = alsa_card_init(outdevname, SND_PCM_STREAM_PLAYBACK);
00270 
00271    if (!alsa.icard || !alsa.ocard) {
00272       ast_log(LOG_ERROR, "Problem opening ALSA I/O devices\n");
00273       return -1;
00274    }
00275 
00276    return readdev;
00277 }
00278 
00279 static int alsa_digit(struct ast_channel *c, char digit, unsigned int duration)
00280 {
00281    ast_mutex_lock(&alsalock);
00282    ast_verbose(" << Console Received digit %c of duration %u ms >> \n", 
00283       digit, duration);
00284    ast_mutex_unlock(&alsalock);
00285 
00286    return 0;
00287 }
00288 
00289 static int alsa_text(struct ast_channel *c, const char *text)
00290 {
00291    ast_mutex_lock(&alsalock);
00292    ast_verbose(" << Console Received text %s >> \n", text);
00293    ast_mutex_unlock(&alsalock);
00294 
00295    return 0;
00296 }
00297 
00298 static void grab_owner(void)
00299 {
00300    while (alsa.owner && ast_channel_trylock(alsa.owner)) {
00301       DEADLOCK_AVOIDANCE(&alsalock);
00302    }
00303 }
00304 
00305 static int alsa_call(struct ast_channel *c, char *dest, int timeout)
00306 {
00307    struct ast_frame f = { AST_FRAME_CONTROL };
00308 
00309    ast_mutex_lock(&alsalock);
00310    ast_verbose(" << Call placed to '%s' on console >> \n", dest);
00311    if (autoanswer) {
00312       ast_verbose(" << Auto-answered >> \n");
00313       grab_owner();
00314       if (alsa.owner) {
00315          f.subclass = AST_CONTROL_ANSWER;
00316          ast_queue_frame(alsa.owner, &f);
00317          ast_channel_unlock(alsa.owner);
00318       }
00319    } else {
00320       ast_verbose(" << Type 'answer' to answer, or use 'autoanswer' for future calls >> \n");
00321       grab_owner();
00322       if (alsa.owner) {
00323          f.subclass = AST_CONTROL_RINGING;
00324          ast_queue_frame(alsa.owner, &f);
00325          ast_channel_unlock(alsa.owner);
00326          ast_indicate(alsa.owner, AST_CONTROL_RINGING);
00327       }
00328    }
00329    snd_pcm_prepare(alsa.icard);
00330    snd_pcm_start(alsa.icard);
00331    ast_mutex_unlock(&alsalock);
00332 
00333    return 0;
00334 }
00335 
00336 static int alsa_answer(struct ast_channel *c)
00337 {
00338    ast_mutex_lock(&alsalock);
00339    ast_verbose(" << Console call has been answered >> \n");
00340    ast_setstate(c, AST_STATE_UP);
00341    snd_pcm_prepare(alsa.icard);
00342    snd_pcm_start(alsa.icard);
00343    ast_mutex_unlock(&alsalock);
00344 
00345    return 0;
00346 }
00347 
00348 static int alsa_hangup(struct ast_channel *c)
00349 {
00350    ast_mutex_lock(&alsalock);
00351    c->tech_pvt = NULL;
00352    alsa.owner = NULL;
00353    ast_verbose(" << Hangup on console >> \n");
00354    ast_module_unref(ast_module_info->self);
00355    hookstate = 0;
00356    snd_pcm_drop(alsa.icard);
00357    ast_mutex_unlock(&alsalock);
00358 
00359    return 0;
00360 }
00361 
00362 static int alsa_write(struct ast_channel *chan, struct ast_frame *f)
00363 {
00364    static char sizbuf[8000];
00365    static int sizpos = 0;
00366    int len = sizpos;
00367    int pos;
00368    int res = 0;
00369    /* size_t frames = 0; */
00370    snd_pcm_state_t state;
00371 
00372    ast_mutex_lock(&alsalock);
00373 
00374    /* We have to digest the frame in 160-byte portions */
00375    if (f->datalen > sizeof(sizbuf) - sizpos) {
00376       ast_log(LOG_WARNING, "Frame too large\n");
00377       res = -1;
00378    } else {
00379       memcpy(sizbuf + sizpos, f->data, f->datalen);
00380       len += f->datalen;
00381       pos = 0;
00382       state = snd_pcm_state(alsa.ocard);
00383       if (state == SND_PCM_STATE_XRUN)
00384          snd_pcm_prepare(alsa.ocard);
00385       while ((res = snd_pcm_writei(alsa.ocard, sizbuf, len / 2)) == -EAGAIN) {
00386          usleep(1);
00387       }
00388       if (res == -EPIPE) {
00389 #if DEBUG
00390          ast_debug(1, "XRUN write\n");
00391 #endif
00392          snd_pcm_prepare(alsa.ocard);
00393          while ((res = snd_pcm_writei(alsa.ocard, sizbuf, len / 2)) == -EAGAIN) {
00394             usleep(1);
00395          }
00396          if (res != len / 2) {
00397             ast_log(LOG_ERROR, "Write error: %s\n", snd_strerror(res));
00398             res = -1;
00399          } else if (res < 0) {
00400             ast_log(LOG_ERROR, "Write error %s\n", snd_strerror(res));
00401             res = -1;
00402          }
00403       } else {
00404          if (res == -ESTRPIPE)
00405             ast_log(LOG_ERROR, "You've got some big problems\n");
00406          else if (res < 0)
00407             ast_log(LOG_NOTICE, "Error %d on write\n", res);
00408       }
00409    }
00410    ast_mutex_unlock(&alsalock);
00411 
00412    return res >= 0 ? 0 : res;
00413 }
00414 
00415 
00416 static struct ast_frame *alsa_read(struct ast_channel *chan)
00417 {
00418    static struct ast_frame f;
00419    static short __buf[FRAME_SIZE + AST_FRIENDLY_OFFSET / 2];
00420    short *buf;
00421    static int readpos = 0;
00422    static int left = FRAME_SIZE;
00423    snd_pcm_state_t state;
00424    int r = 0;
00425    int off = 0;
00426 
00427    ast_mutex_lock(&alsalock);
00428    f.frametype = AST_FRAME_NULL;
00429    f.subclass = 0;
00430    f.samples = 0;
00431    f.datalen = 0;
00432    f.data = NULL;
00433    f.offset = 0;
00434    f.src = "Console";
00435    f.mallocd = 0;
00436    f.delivery.tv_sec = 0;
00437    f.delivery.tv_usec = 0;
00438 
00439    state = snd_pcm_state(alsa.icard);
00440    if ((state != SND_PCM_STATE_PREPARED) && (state != SND_PCM_STATE_RUNNING)) {
00441       snd_pcm_prepare(alsa.icard);
00442    }
00443 
00444    buf = __buf + AST_FRIENDLY_OFFSET / 2;
00445 
00446    r = snd_pcm_readi(alsa.icard, buf + readpos, left);
00447    if (r == -EPIPE) {
00448 #if DEBUG
00449       ast_log(LOG_ERROR, "XRUN read\n");
00450 #endif
00451       snd_pcm_prepare(alsa.icard);
00452    } else if (r == -ESTRPIPE) {
00453       ast_log(LOG_ERROR, "-ESTRPIPE\n");
00454       snd_pcm_prepare(alsa.icard);
00455    } else if (r < 0) {
00456       ast_log(LOG_ERROR, "Read error: %s\n", snd_strerror(r));
00457    } else if (r >= 0) {
00458       off -= r;
00459    }
00460    /* Update positions */
00461    readpos += r;
00462    left -= r;
00463 
00464    if (readpos >= FRAME_SIZE) {
00465       /* A real frame */
00466       readpos = 0;
00467       left = FRAME_SIZE;
00468       if (chan->_state != AST_STATE_UP) {
00469          /* Don't transmit unless it's up */
00470          ast_mutex_unlock(&alsalock);
00471          return &f;
00472       }
00473       f.frametype = AST_FRAME_VOICE;
00474       f.subclass = AST_FORMAT_SLINEAR;
00475       f.samples = FRAME_SIZE;
00476       f.datalen = FRAME_SIZE * 2;
00477       f.data = buf;
00478       f.offset = AST_FRIENDLY_OFFSET;
00479       f.src = "Console";
00480       f.mallocd = 0;
00481 
00482    }
00483    ast_mutex_unlock(&alsalock);
00484 
00485    return &f;
00486 }
00487 
00488 static int alsa_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
00489 {
00490    struct chan_alsa_pvt *p = newchan->tech_pvt;
00491 
00492    ast_mutex_lock(&alsalock);
00493    p->owner = newchan;
00494    ast_mutex_unlock(&alsalock);
00495 
00496    return 0;
00497 }
00498 
00499 static int alsa_indicate(struct ast_channel *chan, int cond, const void *data, size_t datalen)
00500 {
00501    int res = 0;
00502 
00503    ast_mutex_lock(&alsalock);
00504 
00505    switch (cond) {
00506    case AST_CONTROL_BUSY:
00507    case AST_CONTROL_CONGESTION:
00508    case AST_CONTROL_RINGING:
00509    case -1:
00510       res = -1;  /* Ask for inband indications */
00511       break;
00512    case AST_CONTROL_PROGRESS:
00513    case AST_CONTROL_PROCEEDING:
00514    case AST_CONTROL_VIDUPDATE:
00515    case AST_CONTROL_SRCUPDATE:
00516       break;
00517    case AST_CONTROL_HOLD:
00518       ast_verbose(" << Console Has Been Placed on Hold >> \n");
00519       ast_moh_start(chan, data, mohinterpret);
00520       break;
00521    case AST_CONTROL_UNHOLD:
00522       ast_verbose(" << Console Has Been Retrieved from Hold >> \n");
00523       ast_moh_stop(chan);
00524       break;
00525    default:
00526       ast_log(LOG_WARNING, "Don't know how to display condition %d on %s\n", cond, chan->name);
00527       res = -1;
00528    }
00529 
00530    ast_mutex_unlock(&alsalock);
00531 
00532    return res;
00533 }
00534 
00535 static struct ast_channel *alsa_new(struct chan_alsa_pvt *p, int state)
00536 {
00537    struct ast_channel *tmp = NULL;
00538 
00539    if (!(tmp = ast_channel_alloc(1, state, 0, 0, "", p->exten, p->context, 0, "ALSA/%s", indevname)))
00540       return NULL;
00541 
00542    tmp->tech = &alsa_tech;
00543    ast_channel_set_fd(tmp, 0, readdev);
00544    tmp->nativeformats = AST_FORMAT_SLINEAR;
00545    tmp->readformat = AST_FORMAT_SLINEAR;
00546    tmp->writeformat = AST_FORMAT_SLINEAR;
00547    tmp->tech_pvt = p;
00548    if (!ast_strlen_zero(p->context))
00549       ast_copy_string(tmp->context, p->context, sizeof(tmp->context));
00550    if (!ast_strlen_zero(p->exten))
00551       ast_copy_string(tmp->exten, p->exten, sizeof(tmp->exten));
00552    if (!ast_strlen_zero(language))
00553       ast_string_field_set(tmp, language, language);
00554    p->owner = tmp;
00555    ast_module_ref(ast_module_info->self);
00556    ast_jb_configure(tmp, &global_jbconf);
00557    if (state != AST_STATE_DOWN) {
00558       if (ast_pbx_start(tmp)) {
00559          ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name);
00560          ast_hangup(tmp);
00561          tmp = NULL;
00562       }
00563    }
00564 
00565    return tmp;
00566 }
00567 
00568 static struct ast_channel *alsa_request(const char *type, int format, void *data, int *cause)
00569 {
00570    int oldformat = format;
00571    struct ast_channel *tmp = NULL;
00572 
00573    if (!(format &= AST_FORMAT_SLINEAR)) {
00574       ast_log(LOG_NOTICE, "Asked to get a channel of format '%d'\n", oldformat);
00575       return NULL;
00576    }
00577 
00578    ast_mutex_lock(&alsalock);
00579 
00580    if (alsa.owner) {
00581       ast_log(LOG_NOTICE, "Already have a call on the ALSA channel\n");
00582       *cause = AST_CAUSE_BUSY;
00583    } else if (!(tmp = alsa_new(&alsa, AST_STATE_DOWN))) {
00584       ast_log(LOG_WARNING, "Unable to create new ALSA channel\n");
00585    }
00586 
00587    ast_mutex_unlock(&alsalock);
00588 
00589    return tmp;
00590 }
00591 
00592 static char *autoanswer_complete(const char *line, const char *word, int pos, int state)
00593 {
00594 #ifndef MIN
00595 #define MIN(a,b) ((a) < (b) ? (a) : (b))
00596 #endif
00597    switch (state) {
00598       case 0:
00599          if (!ast_strlen_zero(word) && !strncasecmp(word, "on", MIN(strlen(word), 2)))
00600             return ast_strdup("on");
00601       case 1:
00602          if (!ast_strlen_zero(word) && !strncasecmp(word, "off", MIN(strlen(word), 3)))
00603             return ast_strdup("off");
00604       default:
00605          return NULL;
00606    }
00607 
00608    return NULL;
00609 }
00610 
00611 static char *console_autoanswer(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00612 {
00613    char *res = CLI_SUCCESS;
00614 
00615    switch (cmd) {
00616    case CLI_INIT:
00617       e->command = "console autoanswer";
00618       e->usage =
00619          "Usage: console autoanswer [on|off]\n"
00620          "       Enables or disables autoanswer feature.  If used without\n"
00621          "       argument, displays the current on/off status of autoanswer.\n"
00622          "       The default value of autoanswer is in 'alsa.conf'.\n";
00623       return NULL;
00624    case CLI_GENERATE:
00625       return autoanswer_complete(a->line, a->word, a->pos, a->n);
00626    }
00627 
00628    if ((a->argc != 2) && (a->argc != 3))
00629       return CLI_SHOWUSAGE;
00630 
00631    ast_mutex_lock(&alsalock);
00632    if (a->argc == 2) {
00633       ast_cli(a->fd, "Auto answer is %s.\n", autoanswer ? "on" : "off");
00634    } else {
00635       if (!strcasecmp(a->argv[2], "on"))
00636          autoanswer = -1;
00637       else if (!strcasecmp(a->argv[2], "off"))
00638          autoanswer = 0;
00639       else
00640          res = CLI_SHOWUSAGE;
00641    }
00642    ast_mutex_unlock(&alsalock);
00643 
00644    return res;
00645 }
00646 
00647 static char *console_answer(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00648 {
00649    char *res = CLI_SUCCESS;
00650 
00651    switch (cmd) {
00652    case CLI_INIT:
00653       e->command = "console answer";
00654       e->usage =
00655          "Usage: console answer\n"
00656          "       Answers an incoming call on the console (ALSA) channel.\n";
00657 
00658       return NULL;
00659    case CLI_GENERATE:
00660       return NULL; 
00661    }
00662 
00663    if (a->argc != 2)
00664       return CLI_SHOWUSAGE;
00665 
00666    ast_mutex_lock(&alsalock);
00667 
00668    if (!alsa.owner) {
00669       ast_cli(a->fd, "No one is calling us\n");
00670       res = CLI_FAILURE;
00671    } else {
00672       hookstate = 1;
00673       grab_owner();
00674       if (alsa.owner) {
00675          struct ast_frame f = { AST_FRAME_CONTROL, AST_CONTROL_ANSWER };
00676 
00677          ast_queue_frame(alsa.owner, &f);
00678          ast_channel_unlock(alsa.owner);
00679       }
00680    }
00681 
00682    snd_pcm_prepare(alsa.icard);
00683    snd_pcm_start(alsa.icard);
00684 
00685    ast_mutex_unlock(&alsalock);
00686 
00687    return res;
00688 }
00689 
00690 static char *console_sendtext(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00691 {
00692    int tmparg = 3;
00693    char *res = CLI_SUCCESS;
00694 
00695    switch (cmd) {
00696    case CLI_INIT:
00697       e->command = "console send text";
00698       e->usage =
00699          "Usage: console send text <message>\n"
00700          "       Sends a text message for display on the remote terminal.\n";
00701       return NULL;
00702    case CLI_GENERATE:
00703       return NULL; 
00704    }
00705 
00706    if (a->argc < 3)
00707       return CLI_SHOWUSAGE;
00708 
00709    ast_mutex_lock(&alsalock);
00710 
00711    if (!alsa.owner) {
00712       ast_cli(a->fd, "No channel active\n");
00713       res = CLI_FAILURE;
00714    } else {
00715       struct ast_frame f = { AST_FRAME_TEXT, 0 };
00716       char text2send[256] = "";
00717 
00718       while (tmparg < a->argc) {
00719          strncat(text2send, a->argv[tmparg++], sizeof(text2send) - strlen(text2send) - 1);
00720          strncat(text2send, " ", sizeof(text2send) - strlen(text2send) - 1);
00721       }
00722 
00723       text2send[strlen(text2send) - 1] = '\n';
00724       f.data = text2send;
00725       f.datalen = strlen(text2send) + 1;
00726       grab_owner();
00727       if (alsa.owner) {
00728          ast_queue_frame(alsa.owner, &f);
00729          f.frametype = AST_FRAME_CONTROL;
00730          f.subclass = AST_CONTROL_ANSWER;
00731          f.data = NULL;
00732          f.datalen = 0;
00733          ast_queue_frame(alsa.owner, &f);
00734          ast_channel_unlock(alsa.owner);
00735       }
00736    }
00737 
00738    ast_mutex_unlock(&alsalock);
00739 
00740    return res;
00741 }
00742 
00743 static char *console_hangup(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00744 {
00745    char *res = CLI_SUCCESS;
00746 
00747    switch (cmd) {
00748    case CLI_INIT:
00749       e->command = "console hangup";
00750       e->usage =
00751          "Usage: console hangup\n"
00752          "       Hangs up any call currently placed on the console.\n";
00753       return NULL;
00754    case CLI_GENERATE:
00755       return NULL; 
00756    }
00757  
00758 
00759    if (a->argc != 2)
00760       return CLI_SHOWUSAGE;
00761 
00762    ast_mutex_lock(&alsalock);
00763 
00764    if (!alsa.owner && !hookstate) {
00765       ast_cli(a->fd, "No call to hangup\n");
00766       res = CLI_FAILURE;
00767    } else {
00768       hookstate = 0;
00769       grab_owner();
00770       if (alsa.owner) {
00771          ast_queue_hangup(alsa.owner);
00772          ast_channel_unlock(alsa.owner);
00773       }
00774    }
00775 
00776    ast_mutex_unlock(&alsalock);
00777 
00778    return res;
00779 }
00780 
00781 static char *console_dial(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00782 {
00783    char tmp[256], *tmp2;
00784    char *mye, *myc;
00785    char *d;
00786    char *res = CLI_SUCCESS;
00787 
00788    switch (cmd) {
00789    case CLI_INIT:
00790       e->command = "console dial";
00791       e->usage =
00792          "Usage: console dial [extension[@context]]\n"
00793          "       Dials a given extension (and context if specified)\n";
00794       return NULL;
00795    case CLI_GENERATE:
00796       return NULL;
00797    }
00798 
00799    if ((a->argc != 2) && (a->argc != 3))
00800       return CLI_SHOWUSAGE;
00801 
00802    ast_mutex_lock(&alsalock);
00803 
00804    if (alsa.owner) {
00805       if (a->argc == 3) {
00806          if (alsa.owner) {
00807             for (d = a->argv[2]; *d; d++) {
00808                struct ast_frame f = { .frametype = AST_FRAME_DTMF, .subclass = *d };
00809 
00810                ast_queue_frame(alsa.owner, &f);
00811             }
00812          }
00813       } else {
00814          ast_cli(a->fd, "You're already in a call.  You can use this only to dial digits until you hangup\n");
00815          res = CLI_FAILURE;
00816       }
00817    } else {
00818       mye = exten;
00819       myc = context;
00820       if (a->argc == 3) {
00821          char *stringp = NULL;
00822 
00823          ast_copy_string(tmp, a->argv[2], sizeof(tmp));
00824          stringp = tmp;
00825          strsep(&stringp, "@");
00826          tmp2 = strsep(&stringp, "@");
00827          if (!ast_strlen_zero(tmp))
00828             mye = tmp;
00829          if (!ast_strlen_zero(tmp2))
00830             myc = tmp2;
00831       }
00832       if (ast_exists_extension(NULL, myc, mye, 1, NULL)) {
00833          ast_copy_string(alsa.exten, mye, sizeof(alsa.exten));
00834          ast_copy_string(alsa.context, myc, sizeof(alsa.context));
00835          hookstate = 1;
00836          alsa_new(&alsa, AST_STATE_RINGING);
00837       } else
00838          ast_cli(a->fd, "No such extension '%s' in context '%s'\n", mye, myc);
00839    }
00840 
00841    ast_mutex_unlock(&alsalock);
00842 
00843    return res;
00844 }
00845 
00846 static struct ast_cli_entry cli_alsa[] = {
00847    AST_CLI_DEFINE(console_answer, "Answer an incoming console call"),
00848    AST_CLI_DEFINE(console_hangup, "Hangup a call on the console"),
00849    AST_CLI_DEFINE(console_dial, "Dial an extension on the console"),
00850    AST_CLI_DEFINE(console_sendtext, "Send text to the remote device"),
00851    AST_CLI_DEFINE(console_autoanswer, "Sets/displays autoanswer"),
00852 };
00853 
00854 static int load_module(void)
00855 {
00856    struct ast_config *cfg;
00857    struct ast_variable *v;
00858    struct ast_flags config_flags = { 0 };
00859 
00860    /* Copy the default jb config over global_jbconf */
00861    memcpy(&global_jbconf, &default_jbconf, sizeof(struct ast_jb_conf));
00862 
00863    strcpy(mohinterpret, "default");
00864 
00865    if (!(cfg = ast_config_load(config, config_flags))) {
00866       ast_log(LOG_ERROR, "Unable to read ALSA configuration file %s.  Aborting.\n", config);
00867       return AST_MODULE_LOAD_DECLINE;
00868    }
00869 
00870    v = ast_variable_browse(cfg, "general");
00871    for (; v; v = v->next) {
00872       /* handle jb conf */
00873       if (!ast_jb_read_conf(&global_jbconf, v->name, v->value))
00874             continue;
00875       
00876       if (!strcasecmp(v->name, "autoanswer"))
00877          autoanswer = ast_true(v->value);
00878       else if (!strcasecmp(v->name, "silencesuppression"))
00879          silencesuppression = ast_true(v->value);
00880       else if (!strcasecmp(v->name, "silencethreshold"))
00881          silencethreshold = atoi(v->value);
00882       else if (!strcasecmp(v->name, "context"))
00883          ast_copy_string(context, v->value, sizeof(context));
00884       else if (!strcasecmp(v->name, "language"))
00885          ast_copy_string(language, v->value, sizeof(language));
00886       else if (!strcasecmp(v->name, "extension"))
00887          ast_copy_string(exten, v->value, sizeof(exten));
00888       else if (!strcasecmp(v->name, "input_device"))
00889          ast_copy_string(indevname, v->value, sizeof(indevname));
00890       else if (!strcasecmp(v->name, "output_device"))
00891          ast_copy_string(outdevname, v->value, sizeof(outdevname));
00892       else if (!strcasecmp(v->name, "mohinterpret"))
00893          ast_copy_string(mohinterpret, v->value, sizeof(mohinterpret));
00894    }
00895    ast_config_destroy(cfg);
00896 
00897    if (soundcard_init() < 0) {
00898       ast_verb(2, "No sound card detected -- console channel will be unavailable\n");
00899       ast_verb(2, "Turn off ALSA support by adding 'noload=chan_alsa.so' in /etc/asterisk/modules.conf\n");
00900       return AST_MODULE_LOAD_DECLINE;
00901    }
00902 
00903    if (ast_channel_register(&alsa_tech)) {
00904       ast_log(LOG_ERROR, "Unable to register channel class 'Console'\n");
00905       return AST_MODULE_LOAD_FAILURE;
00906    }
00907 
00908    ast_cli_register_multiple(cli_alsa, sizeof(cli_alsa) / sizeof(struct ast_cli_entry));
00909 
00910    return AST_MODULE_LOAD_SUCCESS;
00911 }
00912 
00913 static int unload_module(void)
00914 {
00915    ast_channel_unregister(&alsa_tech);
00916    ast_cli_unregister_multiple(cli_alsa, sizeof(cli_alsa) / sizeof(struct ast_cli_entry));
00917 
00918    if (alsa.icard)
00919       snd_pcm_close(alsa.icard);
00920    if (alsa.ocard)
00921       snd_pcm_close(alsa.ocard);
00922    if (alsa.owner)
00923       ast_softhangup(alsa.owner, AST_SOFTHANGUP_APPUNLOAD);
00924    if (alsa.owner)
00925       return -1;
00926 
00927    return 0;
00928 }
00929 
00930 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "ALSA Console Channel Driver");

Generated on Wed Oct 28 11:45:29 2009 for Asterisk - the Open Source PBX by  doxygen 1.5.6