ALSA sound card channel driver. More...

#include "asterisk.h"
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <alsa/asoundlib.h>
#include "asterisk/frame.h"
#include "asterisk/channel.h"
#include "asterisk/module.h"
#include "asterisk/pbx.h"
#include "asterisk/config.h"
#include "asterisk/cli.h"
#include "asterisk/utils.h"
#include "asterisk/causes.h"
#include "asterisk/endian.h"
#include "asterisk/stringfields.h"
#include "asterisk/abstract_jb.h"
#include "asterisk/musiconhold.h"
#include "asterisk/poll-compat.h"

Include dependency graph for chan_alsa.c:

Go to the source code of this file.

Data Structures
struct	chan_alsa_pvt
Defines
#define	ALSA_INDEV "default"
#define	ALSA_OUTDEV "default"
#define	ALSA_PCM_NEW_HW_PARAMS_API
#define	ALSA_PCM_NEW_SW_PARAMS_API
#define	BUFFER_FMT ((buffersize * 10) << 16) \| (0x0006);
#define	DEBUG 0
#define	DESIRED_RATE 8000
#define	FRAME_SIZE 160
#define	MAX_BUFFER_SIZE 100
#define	MIN_SWITCH_TIME 600
#define	PERIOD_FRAMES 80
Functions
static void	__reg_module (void)
static void	__unreg_module (void)
static int	alsa_answer (struct ast_channel *c)
static int	alsa_call (struct ast_channel c, char dest, int timeout)
static snd_pcm_t *	alsa_card_init (char *dev, snd_pcm_stream_t stream)
static int	alsa_digit (struct ast_channel *c, char digit, unsigned int duration)
static int	alsa_fixup (struct ast_channel oldchan, struct ast_channel newchan)
static int	alsa_hangup (struct ast_channel *c)
static int	alsa_indicate (struct ast_channel chan, int cond, const void data, size_t datalen)
static struct ast_channel *	alsa_new (struct chan_alsa_pvt *p, int state)
static struct ast_frame *	alsa_read (struct ast_channel *chan)
static struct ast_channel *	alsa_request (const char type, int format, void data, int *cause)
static int	alsa_text (struct ast_channel c, const char text)
static int	alsa_write (struct ast_channel chan, struct ast_frame f)
static char *	autoanswer_complete (const char line, const char word, int pos, int state)
static char *	console_answer (struct ast_cli_entry e, int cmd, struct ast_cli_args a)
static char *	console_autoanswer (struct ast_cli_entry e, int cmd, struct ast_cli_args a)
static char *	console_dial (struct ast_cli_entry e, int cmd, struct ast_cli_args a)
static char *	console_hangup (struct ast_cli_entry e, int cmd, struct ast_cli_args a)
static char *	console_sendtext (struct ast_cli_entry e, int cmd, struct ast_cli_args a)
static void	grab_owner (void)
static int	load_module (void)
static int	soundcard_init (void)
static int	unload_module (void)
Variables
static struct ast_module_info __MODULE_INFO_SECTION	__mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "ALSA Console Channel Driver" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, }
static struct chan_alsa_pvt	alsa
static struct ast_channel_tech	alsa_tech
static ast_mutex_t	alsalock = AST_MUTEX_INIT_VALUE
static struct ast_module_info *	ast_module_info = &__mod_info
static int	autoanswer = 1
static struct ast_cli_entry	cli_alsa []
static const char	config [] = "alsa.conf"
static char	context [AST_MAX_CONTEXT] = "default"
static struct ast_jb_conf	default_jbconf
static char	exten [AST_MAX_EXTENSION] = "s"
static snd_pcm_format_t	format = SND_PCM_FORMAT_S16_LE
static struct ast_jb_conf	global_jbconf
static int	hookstate = 0
static char	indevname [50] = ALSA_INDEV
static char	language [MAX_LANGUAGE] = ""
static char	mohinterpret [MAX_MUSICCLASS]
static char	outdevname [50] = ALSA_OUTDEV
static int	readdev = -1
static int	silencesuppression = 0
static int	silencethreshold = 1000
static const char	tdesc [] = "ALSA Console Channel Driver"
static int	writedev = -1

Detailed Description

ALSA sound card channel driver.

Author:: Matthew Fredrickson <creslin@digium.com>

See also

Config_alsa

Definition in file chan_alsa.c.

Define Documentation

#define ALSA_INDEV "default"

Definition at line 72 of file chan_alsa.c.

#define ALSA_OUTDEV "default"

Definition at line 73 of file chan_alsa.c.

#define ALSA_PCM_NEW_HW_PARAMS_API

Definition at line 42 of file chan_alsa.c.

#define ALSA_PCM_NEW_SW_PARAMS_API

Definition at line 43 of file chan_alsa.c.

#define BUFFER_FMT ((buffersize * 10) << 16) | (0x0006);

Definition at line 83 of file chan_alsa.c.

#define DEBUG 0

Definition at line 70 of file chan_alsa.c.

#define DESIRED_RATE 8000

Definition at line 74 of file chan_alsa.c.

Referenced by alsa_card_init().

#define FRAME_SIZE 160

Definition at line 77 of file chan_alsa.c.

Referenced by alsa_read().

#define MAX_BUFFER_SIZE 100

Definition at line 126 of file chan_alsa.c.

#define MIN_SWITCH_TIME 600

Definition at line 86 of file chan_alsa.c.

#define PERIOD_FRAMES 80

Definition at line 78 of file chan_alsa.c.

Referenced by alsa_card_init().

Function Documentation

static void __reg_module ( void ) [static]

Definition at line 931 of file chan_alsa.c.

static void __unreg_module ( void ) [static]

Definition at line 931 of file chan_alsa.c.

static int alsa_answer ( struct ast_channel * c ) [static]

Definition at line 337 of file chan_alsa.c.

References alsa, alsalock, ast_mutex_lock(), ast_mutex_unlock(), ast_setstate(), AST_STATE_UP, ast_verbose(), and chan_alsa_pvt::icard.

{
   ast_mutex_lock(&alsalock);
   ast_verbose(" << Console call has been answered >> \n");
   ast_setstate(c, AST_STATE_UP);
   snd_pcm_prepare(alsa.icard);
   snd_pcm_start(alsa.icard);
   ast_mutex_unlock(&alsalock);

   return 0;
}

static int alsa_call	(	struct ast_channel *	c,
		char *	dest,
		int	timeout
	)		`[static]`

Definition at line 306 of file chan_alsa.c.

References alsa, alsalock, ast_channel_unlock, AST_CONTROL_ANSWER, AST_CONTROL_RINGING, AST_FRAME_CONTROL, ast_indicate(), ast_mutex_lock(), ast_mutex_unlock(), ast_queue_frame(), ast_verbose(), grab_owner(), chan_alsa_pvt::icard, chan_alsa_pvt::owner, and ast_frame::subclass.

{
   struct ast_frame f = { AST_FRAME_CONTROL };

   ast_mutex_lock(&alsalock);
   ast_verbose(" << Call placed to '%s' on console >> \n", dest);
   if (autoanswer) {
      ast_verbose(" << Auto-answered >> \n");
      grab_owner();
      if (alsa.owner) {
         f.subclass = AST_CONTROL_ANSWER;
         ast_queue_frame(alsa.owner, &f);
         ast_channel_unlock(alsa.owner);
      }
   } else {
      ast_verbose(" << Type 'answer' to answer, or use 'autoanswer' for future calls >> \n");
      grab_owner();
      if (alsa.owner) {
         f.subclass = AST_CONTROL_RINGING;
         ast_queue_frame(alsa.owner, &f);
         ast_channel_unlock(alsa.owner);
         ast_indicate(alsa.owner, AST_CONTROL_RINGING);
      }
   }
   snd_pcm_prepare(alsa.icard);
   snd_pcm_start(alsa.icard);
   ast_mutex_unlock(&alsalock);

   return 0;
}

static snd_pcm_t* alsa_card_init	(	char *	dev,
		snd_pcm_stream_t	stream
	)		`[static]`

Definition at line 161 of file chan_alsa.c.

References ast_debug, ast_log(), DESIRED_RATE, LOG_ERROR, LOG_WARNING, and PERIOD_FRAMES.

Referenced by soundcard_init().

{
   int err;
   int direction;
   snd_pcm_t *handle = NULL;
   snd_pcm_hw_params_t *hwparams = NULL;
   snd_pcm_sw_params_t *swparams = NULL;
   struct pollfd pfd;
   snd_pcm_uframes_t period_size = PERIOD_FRAMES * 4;
   snd_pcm_uframes_t buffer_size = 0;
   unsigned int rate = DESIRED_RATE;
   snd_pcm_uframes_t start_threshold, stop_threshold;

   err = snd_pcm_open(&handle, dev, stream, SND_PCM_NONBLOCK);
   if (err < 0) {
      ast_log(LOG_ERROR, "snd_pcm_open failed: %s\n", snd_strerror(err));
      return NULL;
   } else {
      ast_debug(1, "Opening device %s in %s mode\n", dev, (stream == SND_PCM_STREAM_CAPTURE) ? "read" : "write");
   }

   hwparams = alloca(snd_pcm_hw_params_sizeof());
   memset(hwparams, 0, snd_pcm_hw_params_sizeof());
   snd_pcm_hw_params_any(handle, hwparams);

   err = snd_pcm_hw_params_set_access(handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED);
   if (err < 0)
      ast_log(LOG_ERROR, "set_access failed: %s\n", snd_strerror(err));

   err = snd_pcm_hw_params_set_format(handle, hwparams, format);
   if (err < 0)
      ast_log(LOG_ERROR, "set_format failed: %s\n", snd_strerror(err));

   err = snd_pcm_hw_params_set_channels(handle, hwparams, 1);
   if (err < 0)
      ast_log(LOG_ERROR, "set_channels failed: %s\n", snd_strerror(err));

   direction = 0;
   err = snd_pcm_hw_params_set_rate_near(handle, hwparams, &rate, &direction);
   if (rate != DESIRED_RATE)
      ast_log(LOG_WARNING, "Rate not correct, requested %d, got %d\n", DESIRED_RATE, rate);

   direction = 0;
   err = snd_pcm_hw_params_set_period_size_near(handle, hwparams, &period_size, &direction);
   if (err < 0)
      ast_log(LOG_ERROR, "period_size(%ld frames) is bad: %s\n", period_size, snd_strerror(err));
   else {
      ast_debug(1, "Period size is %d\n", err);
   }

   buffer_size = 4096 * 2;    /* period_size * 16; */
   err = snd_pcm_hw_params_set_buffer_size_near(handle, hwparams, &buffer_size);
   if (err < 0)
      ast_log(LOG_WARNING, "Problem setting buffer size of %ld: %s\n", buffer_size, snd_strerror(err));
   else {
      ast_debug(1, "Buffer size is set to %d frames\n", err);
   }

   err = snd_pcm_hw_params(handle, hwparams);
   if (err < 0)
      ast_log(LOG_ERROR, "Couldn't set the new hw params: %s\n", snd_strerror(err));

   swparams = alloca(snd_pcm_sw_params_sizeof());
   memset(swparams, 0, snd_pcm_sw_params_sizeof());
   snd_pcm_sw_params_current(handle, swparams);

   if (stream == SND_PCM_STREAM_PLAYBACK)
      start_threshold = period_size;
   else
      start_threshold = 1;

   err = snd_pcm_sw_params_set_start_threshold(handle, swparams, start_threshold);
   if (err < 0)
      ast_log(LOG_ERROR, "start threshold: %s\n", snd_strerror(err));

   if (stream == SND_PCM_STREAM_PLAYBACK)
      stop_threshold = buffer_size;
   else
      stop_threshold = buffer_size;

   err = snd_pcm_sw_params_set_stop_threshold(handle, swparams, stop_threshold);
   if (err < 0)
      ast_log(LOG_ERROR, "stop threshold: %s\n", snd_strerror(err));

   err = snd_pcm_sw_params(handle, swparams);
   if (err < 0)
      ast_log(LOG_ERROR, "sw_params: %s\n", snd_strerror(err));

   err = snd_pcm_poll_descriptors_count(handle);
   if (err <= 0)
      ast_log(LOG_ERROR, "Unable to get a poll descriptors count, error is %s\n", snd_strerror(err));
   if (err != 1) {
      ast_debug(1, "Can't handle more than one device\n");
   }

   snd_pcm_poll_descriptors(handle, &pfd, err);
   ast_debug(1, "Acquired fd %d from the poll descriptor\n", pfd.fd);

   if (stream == SND_PCM_STREAM_CAPTURE)
      readdev = pfd.fd;
   else
      writedev = pfd.fd;

   return handle;
}

static int alsa_digit	(	struct ast_channel *	c,
		char	digit,
		unsigned int	duration
	)		`[static]`

Definition at line 280 of file chan_alsa.c.

References alsalock, ast_mutex_lock(), ast_mutex_unlock(), and ast_verbose().

{
   ast_mutex_lock(&alsalock);
   ast_verbose(" << Console Received digit %c of duration %u ms >> \n", 
      digit, duration);
   ast_mutex_unlock(&alsalock);

   return 0;
}

static int alsa_fixup	(	struct ast_channel *	oldchan,
		struct ast_channel *	newchan
	)		`[static]`

Definition at line 489 of file chan_alsa.c.

References alsalock, ast_mutex_lock(), ast_mutex_unlock(), chan_alsa_pvt::owner, and ast_channel::tech_pvt.

{
   struct chan_alsa_pvt *p = newchan->tech_pvt;

   ast_mutex_lock(&alsalock);
   p->owner = newchan;
   ast_mutex_unlock(&alsalock);

   return 0;
}

static int alsa_hangup ( struct ast_channel * c ) [static]

Definition at line 349 of file chan_alsa.c.

References alsa, alsalock, ast_module_unref(), ast_mutex_lock(), ast_mutex_unlock(), ast_verbose(), chan_alsa_pvt::icard, chan_alsa_pvt::owner, ast_module_info::self, and ast_channel::tech_pvt.

{
   ast_mutex_lock(&alsalock);
   c->tech_pvt = NULL;
   alsa.owner = NULL;
   ast_verbose(" << Hangup on console >> \n");
   ast_module_unref(ast_module_info->self);
   hookstate = 0;
   snd_pcm_drop(alsa.icard);
   ast_mutex_unlock(&alsalock);

   return 0;
}

static int alsa_indicate	(	struct ast_channel *	chan,
		int	cond,
		const void *	data,
		size_t	datalen
	)		`[static]`

Definition at line 500 of file chan_alsa.c.

References alsalock, AST_CONTROL_BUSY, AST_CONTROL_CONGESTION, AST_CONTROL_HOLD, AST_CONTROL_PROCEEDING, AST_CONTROL_PROGRESS, AST_CONTROL_RINGING, AST_CONTROL_SRCUPDATE, AST_CONTROL_UNHOLD, AST_CONTROL_VIDUPDATE, ast_log(), ast_moh_start(), ast_moh_stop(), ast_mutex_lock(), ast_mutex_unlock(), ast_verbose(), LOG_WARNING, and ast_channel::name.

{
   int res = 0;

   ast_mutex_lock(&alsalock);

   switch (cond) {
   case AST_CONTROL_BUSY:
   case AST_CONTROL_CONGESTION:
   case AST_CONTROL_RINGING:
   case -1:
      res = -1;  /* Ask for inband indications */
      break;
   case AST_CONTROL_PROGRESS:
   case AST_CONTROL_PROCEEDING:
   case AST_CONTROL_VIDUPDATE:
   case AST_CONTROL_SRCUPDATE:
      break;
   case AST_CONTROL_HOLD:
      ast_verbose(" << Console Has Been Placed on Hold >> \n");
      ast_moh_start(chan, data, mohinterpret);
      break;
   case AST_CONTROL_UNHOLD:
      ast_verbose(" << Console Has Been Retrieved from Hold >> \n");
      ast_moh_stop(chan);
      break;
   default:
      ast_log(LOG_WARNING, "Don't know how to display condition %d on %s\n", cond, chan->name);
      res = -1;
   }

   ast_mutex_unlock(&alsalock);

   return res;
}

static struct ast_channel* alsa_new	(	struct chan_alsa_pvt *	p,
		int	state
	)		`[static, read]`

Definition at line 536 of file chan_alsa.c.

References alsa_tech, ast_channel_alloc(), ast_channel_set_fd(), ast_copy_string(), AST_FORMAT_SLINEAR, ast_hangup(), ast_jb_configure(), ast_log(), ast_module_ref(), ast_pbx_start(), AST_STATE_DOWN, ast_string_field_set, ast_strlen_zero(), ast_channel::context, chan_alsa_pvt::context, ast_channel::exten, chan_alsa_pvt::exten, global_jbconf, LOG_WARNING, ast_channel::name, ast_channel::nativeformats, chan_alsa_pvt::owner, ast_channel::readformat, ast_module_info::self, ast_channel::tech, ast_channel::tech_pvt, and ast_channel::writeformat.

Referenced by alsa_request(), and console_dial().

{
   struct ast_channel *tmp = NULL;

   if (!(tmp = ast_channel_alloc(1, state, 0, 0, "", p->exten, p->context, 0, "ALSA/%s", indevname)))
      return NULL;

   tmp->tech = &alsa_tech;
   ast_channel_set_fd(tmp, 0, readdev);
   tmp->nativeformats = AST_FORMAT_SLINEAR;
   tmp->readformat = AST_FORMAT_SLINEAR;
   tmp->writeformat = AST_FORMAT_SLINEAR;
   tmp->tech_pvt = p;
   if (!ast_strlen_zero(p->context))
      ast_copy_string(tmp->context, p->context, sizeof(tmp->context));
   if (!ast_strlen_zero(p->exten))
      ast_copy_string(tmp->exten, p->exten, sizeof(tmp->exten));
   if (!ast_strlen_zero(language))
      ast_string_field_set(tmp, language, language);
   p->owner = tmp;
   ast_module_ref(ast_module_info->self);
   ast_jb_configure(tmp, &global_jbconf);
   if (state != AST_STATE_DOWN) {
      if (ast_pbx_start(tmp)) {
         ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name);
         ast_hangup(tmp);
         tmp = NULL;
      }
   }

   return tmp;
}

static struct ast_frame * alsa_read ( struct ast_channel * chan ) [static, read]

Definition at line 417 of file chan_alsa.c.

References ast_channel::_state, alsa, alsalock, AST_FORMAT_SLINEAR, AST_FRAME_NULL, AST_FRAME_VOICE, AST_FRIENDLY_OFFSET, ast_log(), ast_mutex_lock(), ast_mutex_unlock(), AST_STATE_UP, buf, ast_frame::data, ast_frame::datalen, ast_frame::delivery, f, FRAME_SIZE, ast_frame::frametype, chan_alsa_pvt::icard, LOG_ERROR, ast_frame::mallocd, ast_frame::offset, ast_frame::ptr, ast_frame::samples, ast_frame::src, and ast_frame::subclass.

{
   static struct ast_frame f;
   static short __buf[FRAME_SIZE + AST_FRIENDLY_OFFSET / 2];
   short *buf;
   static int readpos = 0;
   static int left = FRAME_SIZE;
   snd_pcm_state_t state;
   int r = 0;
   int off = 0;

   ast_mutex_lock(&alsalock);
   f.frametype = AST_FRAME_NULL;
   f.subclass = 0;
   f.samples = 0;
   f.datalen = 0;
   f.data.ptr = NULL;
   f.offset = 0;
   f.src = "Console";
   f.mallocd = 0;
   f.delivery.tv_sec = 0;
   f.delivery.tv_usec = 0;

   state = snd_pcm_state(alsa.icard);
   if ((state != SND_PCM_STATE_PREPARED) && (state != SND_PCM_STATE_RUNNING)) {
      snd_pcm_prepare(alsa.icard);
   }

   buf = __buf + AST_FRIENDLY_OFFSET / 2;

   r = snd_pcm_readi(alsa.icard, buf + readpos, left);
   if (r == -EPIPE) {
#if DEBUG
      ast_log(LOG_ERROR, "XRUN read\n");
#endif
      snd_pcm_prepare(alsa.icard);
   } else if (r == -ESTRPIPE) {
      ast_log(LOG_ERROR, "-ESTRPIPE\n");
      snd_pcm_prepare(alsa.icard);
   } else if (r < 0) {
      ast_log(LOG_ERROR, "Read error: %s\n", snd_strerror(r));
   } else if (r >= 0) {
      off -= r;
   }
   /* Update positions */
   readpos += r;
   left -= r;

   if (readpos >= FRAME_SIZE) {
      /* A real frame */
      readpos = 0;
      left = FRAME_SIZE;
      if (chan->_state != AST_STATE_UP) {
         /* Don't transmit unless it's up */
         ast_mutex_unlock(&alsalock);
         return &f;
      }
      f.frametype = AST_FRAME_VOICE;
      f.subclass = AST_FORMAT_SLINEAR;
      f.samples = FRAME_SIZE;
      f.datalen = FRAME_SIZE * 2;
      f.data.ptr = buf;
      f.offset = AST_FRIENDLY_OFFSET;
      f.src = "Console";
      f.mallocd = 0;

   }
   ast_mutex_unlock(&alsalock);

   return &f;
}

static struct ast_channel * alsa_request	(	const char *	type,
		int	format,
		void *	data,
		int *	cause
	)		`[static, read]`

Definition at line 569 of file chan_alsa.c.

References alsa, alsa_new(), alsalock, AST_CAUSE_BUSY, AST_FORMAT_SLINEAR, ast_log(), ast_mutex_lock(), ast_mutex_unlock(), AST_STATE_DOWN, LOG_NOTICE, LOG_WARNING, and chan_alsa_pvt::owner.

{
   int oldformat = fmt;
   struct ast_channel *tmp = NULL;

   if (!(fmt &= AST_FORMAT_SLINEAR)) {
      ast_log(LOG_NOTICE, "Asked to get a channel of format '%d'\n", oldformat);
      return NULL;
   }

   ast_mutex_lock(&alsalock);

   if (alsa.owner) {
      ast_log(LOG_NOTICE, "Already have a call on the ALSA channel\n");
      *cause = AST_CAUSE_BUSY;
   } else if (!(tmp = alsa_new(&alsa, AST_STATE_DOWN))) {
      ast_log(LOG_WARNING, "Unable to create new ALSA channel\n");
   }

   ast_mutex_unlock(&alsalock);

   return tmp;
}

static int alsa_text	(	struct ast_channel *	c,
		const char *	text
	)		`[static]`

Definition at line 290 of file chan_alsa.c.

References alsalock, ast_mutex_lock(), ast_mutex_unlock(), and ast_verbose().

{
   ast_mutex_lock(&alsalock);
   ast_verbose(" << Console Received text %s >> \n", text);
   ast_mutex_unlock(&alsalock);

   return 0;
}

static int alsa_write	(	struct ast_channel *	chan,
		struct ast_frame *	f
	)		`[static]`

Definition at line 363 of file chan_alsa.c.

References alsa, alsalock, ast_debug, ast_log(), ast_mutex_lock(), ast_mutex_unlock(), ast_frame::data, ast_frame::datalen, len(), LOG_ERROR, LOG_NOTICE, LOG_WARNING, chan_alsa_pvt::ocard, and ast_frame::ptr.

{
   static char sizbuf[8000];
   static int sizpos = 0;
   int len = sizpos;
   int pos;
   int res = 0;
   /* size_t frames = 0; */
   snd_pcm_state_t state;

   ast_mutex_lock(&alsalock);

   /* We have to digest the frame in 160-byte portions */
   if (f->datalen > sizeof(sizbuf) - sizpos) {
      ast_log(LOG_WARNING, "Frame too large\n");
      res = -1;
   } else {
      memcpy(sizbuf + sizpos, f->data.ptr, f->datalen);
      len += f->datalen;
      pos = 0;
      state = snd_pcm_state(alsa.ocard);
      if (state == SND_PCM_STATE_XRUN)
         snd_pcm_prepare(alsa.ocard);
      while ((res = snd_pcm_writei(alsa.ocard, sizbuf, len / 2)) == -EAGAIN) {
         usleep(1);
      }
      if (res == -EPIPE) {
#if DEBUG
         ast_debug(1, "XRUN write\n");
#endif
         snd_pcm_prepare(alsa.ocard);
         while ((res = snd_pcm_writei(alsa.ocard, sizbuf, len / 2)) == -EAGAIN) {
            usleep(1);
         }
         if (res != len / 2) {
            ast_log(LOG_ERROR, "Write error: %s\n", snd_strerror(res));
            res = -1;
         } else if (res < 0) {
            ast_log(LOG_ERROR, "Write error %s\n", snd_strerror(res));
            res = -1;
         }
      } else {
         if (res == -ESTRPIPE)
            ast_log(LOG_ERROR, "You've got some big problems\n");
         else if (res < 0)
            ast_log(LOG_NOTICE, "Error %d on write\n", res);
      }
   }
   ast_mutex_unlock(&alsalock);

   return res >= 0 ? 0 : res;
}

static char* autoanswer_complete	(	const char *	line,
		const char *	word,
		int	pos,
		int	state
	)		`[static]`

Definition at line 593 of file chan_alsa.c.

References ast_strdup, ast_strlen_zero(), and MIN.

Referenced by console_autoanswer().

{
   switch (state) {
      case 0:
         if (!ast_strlen_zero(word) && !strncasecmp(word, "on", MIN(strlen(word), 2)))
            return ast_strdup("on");
      case 1:
         if (!ast_strlen_zero(word) && !strncasecmp(word, "off", MIN(strlen(word), 3)))
            return ast_strdup("off");
      default:
         return NULL;
   }

   return NULL;
}

static char* console_answer	(	struct ast_cli_entry *	e,
		int	cmd,
		struct ast_cli_args *	a
	)		`[static]`

Definition at line 645 of file chan_alsa.c.

References alsa, alsalock, ast_cli_args::argc, ast_channel_unlock, ast_cli(), AST_CONTROL_ANSWER, AST_FRAME_CONTROL, ast_mutex_lock(), ast_mutex_unlock(), ast_queue_frame(), CLI_FAILURE, CLI_GENERATE, CLI_INIT, CLI_SHOWUSAGE, CLI_SUCCESS, ast_cli_entry::command, ast_cli_args::fd, grab_owner(), chan_alsa_pvt::icard, chan_alsa_pvt::owner, and ast_cli_entry::usage.

{
   char *res = CLI_SUCCESS;

   switch (cmd) {
   case CLI_INIT:
      e->command = "console answer";
      e->usage =
         "Usage: console answer\n"
         "       Answers an incoming call on the console (ALSA) channel.\n";

      return NULL;
   case CLI_GENERATE:
      return NULL; 
   }

   if (a->argc != 2)
      return CLI_SHOWUSAGE;

   ast_mutex_lock(&alsalock);

   if (!alsa.owner) {
      ast_cli(a->fd, "No one is calling us\n");
      res = CLI_FAILURE;
   } else {
      hookstate = 1;
      grab_owner();
      if (alsa.owner) {
         struct ast_frame f = { AST_FRAME_CONTROL, AST_CONTROL_ANSWER };

         ast_queue_frame(alsa.owner, &f);
         ast_channel_unlock(alsa.owner);
      }
   }

   snd_pcm_prepare(alsa.icard);
   snd_pcm_start(alsa.icard);

   ast_mutex_unlock(&alsalock);

   return res;
}

static char* console_autoanswer	(	struct ast_cli_entry *	e,
		int	cmd,
		struct ast_cli_args *	a
	)		`[static]`

Definition at line 609 of file chan_alsa.c.

References alsalock, ast_cli_args::argc, ast_cli_args::argv, ast_cli(), ast_mutex_lock(), ast_mutex_unlock(), autoanswer_complete(), CLI_GENERATE, CLI_INIT, CLI_SHOWUSAGE, CLI_SUCCESS, ast_cli_entry::command, ast_cli_args::fd, ast_cli_args::line, ast_cli_args::n, ast_cli_args::pos, ast_cli_entry::usage, and ast_cli_args::word.

{
   char *res = CLI_SUCCESS;

   switch (cmd) {
   case CLI_INIT:
      e->command = "console autoanswer";
      e->usage =
         "Usage: console autoanswer [on|off]\n"
         "       Enables or disables autoanswer feature.  If used without\n"
         "       argument, displays the current on/off status of autoanswer.\n"
         "       The default value of autoanswer is in 'alsa.conf'.\n";
      return NULL;
   case CLI_GENERATE:
      return autoanswer_complete(a->line, a->word, a->pos, a->n);
   }

   if ((a->argc != 2) && (a->argc != 3))
      return CLI_SHOWUSAGE;

   ast_mutex_lock(&alsalock);
   if (a->argc == 2) {
      ast_cli(a->fd, "Auto answer is %s.\n", autoanswer ? "on" : "off");
   } else {
      if (!strcasecmp(a->argv[2], "on"))
         autoanswer = -1;
      else if (!strcasecmp(a->argv[2], "off"))
         autoanswer = 0;
      else
         res = CLI_SHOWUSAGE;
   }
   ast_mutex_unlock(&alsalock);

   return res;
}

static char* console_dial	(	struct ast_cli_entry *	e,
		int	cmd,
		struct ast_cli_args *	a
	)		`[static]`

Definition at line 779 of file chan_alsa.c.

References alsa, alsa_new(), alsalock, ast_cli_args::argc, ast_cli_args::argv, ast_cli(), ast_copy_string(), ast_exists_extension(), AST_FRAME_DTMF, ast_mutex_lock(), ast_mutex_unlock(), ast_queue_frame(), AST_STATE_RINGING, ast_strlen_zero(), CLI_FAILURE, CLI_GENERATE, CLI_INIT, CLI_SHOWUSAGE, CLI_SUCCESS, ast_cli_entry::command, chan_alsa_pvt::context, context, chan_alsa_pvt::exten, exten, ast_cli_args::fd, ast_frame::frametype, chan_alsa_pvt::owner, strsep(), and ast_cli_entry::usage.

{
   char tmp[256], *tmp2;
   char *mye, *myc;
   char *d;
   char *res = CLI_SUCCESS;

   switch (cmd) {
   case CLI_INIT:
      e->command = "console dial";
      e->usage =
         "Usage: console dial [extension[@context]]\n"
         "       Dials a given extension (and context if specified)\n";
      return NULL;
   case CLI_GENERATE:
      return NULL;
   }

   if ((a->argc != 2) && (a->argc != 3))
      return CLI_SHOWUSAGE;

   ast_mutex_lock(&alsalock);

   if (alsa.owner) {
      if (a->argc == 3) {
         if (alsa.owner) {
            for (d = a->argv[2]; *d; d++) {
               struct ast_frame f = { .frametype = AST_FRAME_DTMF, .subclass = *d };

               ast_queue_frame(alsa.owner, &f);
            }
         }
      } else {
         ast_cli(a->fd, "You're already in a call.  You can use this only to dial digits until you hangup\n");
         res = CLI_FAILURE;
      }
   } else {
      mye = exten;
      myc = context;
      if (a->argc == 3) {
         char *stringp = NULL;

         ast_copy_string(tmp, a->argv[2], sizeof(tmp));
         stringp = tmp;
         strsep(&stringp, "@");
         tmp2 = strsep(&stringp, "@");
         if (!ast_strlen_zero(tmp))
            mye = tmp;
         if (!ast_strlen_zero(tmp2))
            myc = tmp2;
      }
      if (ast_exists_extension(NULL, myc, mye, 1, NULL)) {
         ast_copy_string(alsa.exten, mye, sizeof(alsa.exten));
         ast_copy_string(alsa.context, myc, sizeof(alsa.context));
         hookstate = 1;
         alsa_new(&alsa, AST_STATE_RINGING);
      } else
         ast_cli(a->fd, "No such extension '%s' in context '%s'\n", mye, myc);
   }

   ast_mutex_unlock(&alsalock);

   return res;
}

static char* console_hangup	(	struct ast_cli_entry *	e,
		int	cmd,
		struct ast_cli_args *	a
	)		`[static]`

Definition at line 741 of file chan_alsa.c.

References alsa, alsalock, ast_cli_args::argc, AST_CAUSE_NORMAL_CLEARING, ast_channel_unlock, ast_cli(), ast_mutex_lock(), ast_mutex_unlock(), ast_queue_hangup_with_cause(), CLI_FAILURE, CLI_GENERATE, CLI_INIT, CLI_SHOWUSAGE, CLI_SUCCESS, ast_cli_entry::command, ast_cli_args::fd, grab_owner(), chan_alsa_pvt::owner, and ast_cli_entry::usage.

{
   char *res = CLI_SUCCESS;

   switch (cmd) {
   case CLI_INIT:
      e->command = "console hangup";
      e->usage =
         "Usage: console hangup\n"
         "       Hangs up any call currently placed on the console.\n";
      return NULL;
   case CLI_GENERATE:
      return NULL; 
   }
 

   if (a->argc != 2)
      return CLI_SHOWUSAGE;

   ast_mutex_lock(&alsalock);

   if (!alsa.owner && !hookstate) {
      ast_cli(a->fd, "No call to hangup\n");
      res = CLI_FAILURE;
   } else {
      hookstate = 0;
      grab_owner();
      if (alsa.owner) {
         ast_queue_hangup_with_cause(alsa.owner, AST_CAUSE_NORMAL_CLEARING);
         ast_channel_unlock(alsa.owner);
      }
   }

   ast_mutex_unlock(&alsalock);

   return res;
}

static char* console_sendtext	(	struct ast_cli_entry *	e,
		int	cmd,
		struct ast_cli_args *	a
	)		`[static]`

Definition at line 688 of file chan_alsa.c.

References alsa, alsalock, ast_cli_args::argc, ast_cli_args::argv, ast_channel_unlock, ast_cli(), AST_CONTROL_ANSWER, AST_FRAME_CONTROL, AST_FRAME_TEXT, ast_mutex_lock(), ast_mutex_unlock(), ast_queue_frame(), CLI_FAILURE, CLI_GENERATE, CLI_INIT, CLI_SHOWUSAGE, CLI_SUCCESS, ast_cli_entry::command, ast_frame::data, ast_frame::datalen, ast_cli_args::fd, ast_frame::frametype, grab_owner(), chan_alsa_pvt::owner, ast_frame::ptr, ast_frame::subclass, and ast_cli_entry::usage.

{
   int tmparg = 3;
   char *res = CLI_SUCCESS;

   switch (cmd) {
   case CLI_INIT:
      e->command = "console send text";
      e->usage =
         "Usage: console send text <message>\n"
         "       Sends a text message for display on the remote terminal.\n";
      return NULL;
   case CLI_GENERATE:
      return NULL; 
   }

   if (a->argc < 3)
      return CLI_SHOWUSAGE;

   ast_mutex_lock(&alsalock);

   if (!alsa.owner) {
      ast_cli(a->fd, "No channel active\n");
      res = CLI_FAILURE;
   } else {
      struct ast_frame f = { AST_FRAME_TEXT, 0 };
      char text2send[256] = "";

      while (tmparg < a->argc) {
         strncat(text2send, a->argv[tmparg++], sizeof(text2send) - strlen(text2send) - 1);
         strncat(text2send, " ", sizeof(text2send) - strlen(text2send) - 1);
      }

      text2send[strlen(text2send) - 1] = '\n';
      f.data.ptr = text2send;
      f.datalen = strlen(text2send) + 1;
      grab_owner();
      if (alsa.owner) {
         ast_queue_frame(alsa.owner, &f);
         f.frametype = AST_FRAME_CONTROL;
         f.subclass = AST_CONTROL_ANSWER;
         f.data.ptr = NULL;
         f.datalen = 0;
         ast_queue_frame(alsa.owner, &f);
         ast_channel_unlock(alsa.owner);
      }
   }

   ast_mutex_unlock(&alsalock);

   return res;
}

static void grab_owner ( void ) [static]

Definition at line 299 of file chan_alsa.c.

References alsa, alsalock, ast_channel_trylock, DEADLOCK_AVOIDANCE, and chan_alsa_pvt::owner.

Referenced by alsa_call(), console_answer(), console_hangup(), and console_sendtext().

{
   while (alsa.owner && ast_channel_trylock(alsa.owner)) {
      DEADLOCK_AVOIDANCE(&alsalock);
   }
}

static int load_module ( void ) [static]

Definition at line 852 of file chan_alsa.c.

References ARRAY_LEN, ast_channel_register(), ast_cli_register_multiple(), ast_config_destroy(), ast_config_load, ast_copy_string(), ast_jb_read_conf(), ast_log(), AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_FAILURE, AST_MODULE_LOAD_SUCCESS, ast_true(), ast_variable_browse(), ast_verb, CONFIG_STATUS_FILEINVALID, global_jbconf, LOG_ERROR, ast_variable::name, ast_variable::next, soundcard_init(), and ast_variable::value.

{
   struct ast_config *cfg;
   struct ast_variable *v;
   struct ast_flags config_flags = { 0 };

   /* Copy the default jb config over global_jbconf */
   memcpy(&global_jbconf, &default_jbconf, sizeof(struct ast_jb_conf));

   strcpy(mohinterpret, "default");

   if (!(cfg = ast_config_load(config, config_flags))) {
      ast_log(LOG_ERROR, "Unable to read ALSA configuration file %s.  Aborting.\n", config);
      return AST_MODULE_LOAD_DECLINE;
   } else if (cfg == CONFIG_STATUS_FILEINVALID) {
      ast_log(LOG_ERROR, "%s is in an invalid format.  Aborting.\n", config);
      return AST_MODULE_LOAD_DECLINE;
   }

   v = ast_variable_browse(cfg, "general");
   for (; v; v = v->next) {
      /* handle jb conf */
      if (!ast_jb_read_conf(&global_jbconf, v->name, v->value))
            continue;
      
      if (!strcasecmp(v->name, "autoanswer"))
         autoanswer = ast_true(v->value);
      else if (!strcasecmp(v->name, "silencesuppression"))
         silencesuppression = ast_true(v->value);
      else if (!strcasecmp(v->name, "silencethreshold"))
         silencethreshold = atoi(v->value);
      else if (!strcasecmp(v->name, "context"))
         ast_copy_string(context, v->value, sizeof(context));
      else if (!strcasecmp(v->name, "language"))
         ast_copy_string(language, v->value, sizeof(language));
      else if (!strcasecmp(v->name, "extension"))
         ast_copy_string(exten, v->value, sizeof(exten));
      else if (!strcasecmp(v->name, "input_device"))
         ast_copy_string(indevname, v->value, sizeof(indevname));
      else if (!strcasecmp(v->name, "output_device"))
         ast_copy_string(outdevname, v->value, sizeof(outdevname));
      else if (!strcasecmp(v->name, "mohinterpret"))
         ast_copy_string(mohinterpret, v->value, sizeof(mohinterpret));
   }
   ast_config_destroy(cfg);

   if (soundcard_init() < 0) {
      ast_verb(2, "No sound card detected -- console channel will be unavailable\n");
      ast_verb(2, "Turn off ALSA support by adding 'noload=chan_alsa.so' in /etc/asterisk/modules.conf\n");
      return AST_MODULE_LOAD_DECLINE;
   }

   if (ast_channel_register(&alsa_tech)) {
      ast_log(LOG_ERROR, "Unable to register channel class 'Console'\n");
      return AST_MODULE_LOAD_FAILURE;
   }

   ast_cli_register_multiple(cli_alsa, ARRAY_LEN(cli_alsa));

   return AST_MODULE_LOAD_SUCCESS;
}

static int soundcard_init ( void ) [static]

Definition at line 267 of file chan_alsa.c.

References alsa, alsa_card_init(), ast_log(), chan_alsa_pvt::icard, LOG_ERROR, chan_alsa_pvt::ocard, and readdev.

Referenced by load_module().

{
   alsa.icard = alsa_card_init(indevname, SND_PCM_STREAM_CAPTURE);
   alsa.ocard = alsa_card_init(outdevname, SND_PCM_STREAM_PLAYBACK);

   if (!alsa.icard || !alsa.ocard) {
      ast_log(LOG_ERROR, "Problem opening ALSA I/O devices\n");
      return -1;
   }

   return readdev;
}

static int unload_module ( void ) [static]

Definition at line 914 of file chan_alsa.c.

References alsa, ARRAY_LEN, ast_channel_unregister(), ast_cli_unregister_multiple(), ast_softhangup(), AST_SOFTHANGUP_APPUNLOAD, chan_alsa_pvt::icard, chan_alsa_pvt::ocard, and chan_alsa_pvt::owner.

{
   ast_channel_unregister(&alsa_tech);
   ast_cli_unregister_multiple(cli_alsa, ARRAY_LEN(cli_alsa));

   if (alsa.icard)
      snd_pcm_close(alsa.icard);
   if (alsa.ocard)
      snd_pcm_close(alsa.ocard);
   if (alsa.owner)
      ast_softhangup(alsa.owner, AST_SOFTHANGUP_APPUNLOAD);
   if (alsa.owner)
      return -1;

   return 0;
}

Variable Documentation

struct ast_module_info __MODULE_INFO_SECTION __mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "ALSA Console Channel Driver" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, } [static]

Definition at line 931 of file chan_alsa.c.

struct chan_alsa_pvt alsa [static]

Referenced by alsa_answer(), alsa_call(), alsa_hangup(), alsa_read(), alsa_request(), alsa_write(), console_answer(), console_dial(), console_hangup(), console_sendtext(), grab_owner(), soundcard_init(), and unload_module().