chan_alsa.c

Asterisk中信道部分的源码 。。。。

	} else {
		hookstate = 1;
		cursound = -1;
		grab_owner();
		if (alsa.owner) {
			struct ast_frame f = { AST_FRAME_CONTROL, AST_CONTROL_ANSWER };
			ast_queue_frame(alsa.owner, &f);
			ast_mutex_unlock(&alsa.owner->lock);
		}
		answer_sound();
	}

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

	ast_mutex_unlock(&alsalock);

	return RESULT_SUCCESS;
}

static int console_answer(int fd, int argc, char *argv[])
{
	int res = RESULT_SUCCESS;

	if (argc != 2)
		return RESULT_SHOWUSAGE;

	ast_mutex_lock(&alsalock);

	if (!alsa.owner) {
		ast_cli(fd, "No one is calling us\n");
		res = RESULT_FAILURE;
	} else {
		hookstate = 1;
		cursound = -1;
		grab_owner();
		if (alsa.owner) {
			struct ast_frame f = { AST_FRAME_CONTROL, AST_CONTROL_ANSWER };
			ast_queue_frame(alsa.owner, &f);
			ast_mutex_unlock(&alsa.owner->lock);
		}
		answer_sound();
	}

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

	ast_mutex_unlock(&alsalock);

	return RESULT_SUCCESS;
}

static char sendtext_usage[] =
	"Usage: console send text <message>\n"
	"       Sends a text message for display on the remote terminal.\n";

static int console_sendtext_deprecated(int fd, int argc, char *argv[])
{
	int tmparg = 2;
	int res = RESULT_SUCCESS;

	if (argc < 2)
		return RESULT_SHOWUSAGE;

	ast_mutex_lock(&alsalock);

	if (!alsa.owner) {
		ast_cli(fd, "No one is calling us\n");
		res = RESULT_FAILURE;
	} else {
		struct ast_frame f = { AST_FRAME_TEXT, 0 };
		char text2send[256] = "";
		text2send[0] = '\0';
		while (tmparg < argc) {
			strncat(text2send, argv[tmparg++], sizeof(text2send) - strlen(text2send) - 1);
			strncat(text2send, " ", sizeof(text2send) - strlen(text2send) - 1);
		}
		text2send[strlen(text2send) - 1] = '\n';
		f.data = 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 = NULL;
			f.datalen = 0;
			ast_queue_frame(alsa.owner, &f);
			ast_mutex_unlock(&alsa.owner->lock);
		}
	}

	ast_mutex_unlock(&alsalock);

	return res;
}

static int console_sendtext(int fd, int argc, char *argv[])
{
	int tmparg = 3;
	int res = RESULT_SUCCESS;

	if (argc < 3)
		return RESULT_SHOWUSAGE;

	ast_mutex_lock(&alsalock);

	if (!alsa.owner) {
		ast_cli(fd, "No one is calling us\n");
		res = RESULT_FAILURE;
	} else {
		struct ast_frame f = { AST_FRAME_TEXT, 0 };
		char text2send[256] = "";
		text2send[0] = '\0';
		while (tmparg < argc) {
			strncat(text2send, argv[tmparg++], sizeof(text2send) - strlen(text2send) - 1);
			strncat(text2send, " ", sizeof(text2send) - strlen(text2send) - 1);
		}
		text2send[strlen(text2send) - 1] = '\n';
		f.data = 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 = NULL;
			f.datalen = 0;
			ast_queue_frame(alsa.owner, &f);
			ast_mutex_unlock(&alsa.owner->lock);
		}
	}

	ast_mutex_unlock(&alsalock);

	return res;
}

static char answer_usage[] =
	"Usage: console answer\n"
	"       Answers an incoming call on the console (ALSA) channel.\n";

static int console_hangup_deprecated(int fd, int argc, char *argv[])
{
	int res = RESULT_SUCCESS;

	if (argc != 1)
		return RESULT_SHOWUSAGE;

	cursound = -1;

	ast_mutex_lock(&alsalock);

	if (!alsa.owner && !hookstate) {
		ast_cli(fd, "No call to hangup up\n");
		res = RESULT_FAILURE;
	} else {
		hookstate = 0;
		grab_owner();
		if (alsa.owner) {
			ast_queue_hangup(alsa.owner);
			ast_mutex_unlock(&alsa.owner->lock);
		}
	}

	ast_mutex_unlock(&alsalock);

	return res;
}

static int console_hangup(int fd, int argc, char *argv[])
{
	int res = RESULT_SUCCESS;

	if (argc != 2)
		return RESULT_SHOWUSAGE;

	cursound = -1;

	ast_mutex_lock(&alsalock);

	if (!alsa.owner && !hookstate) {
		ast_cli(fd, "No call to hangup up\n");
		res = RESULT_FAILURE;
	} else {
		hookstate = 0;
		grab_owner();
		if (alsa.owner) {
			ast_queue_hangup(alsa.owner);
			ast_mutex_unlock(&alsa.owner->lock);
		}
	}

	ast_mutex_unlock(&alsalock);

	return res;
}

static char hangup_usage[] =
	"Usage: console hangup\n"
	"       Hangs up any call currently placed on the console.\n";

static int console_dial_deprecated(int fd, int argc, char *argv[])
{
	char tmp[256], *tmp2;
	char *mye, *myc;
	char *d;
	int res = RESULT_SUCCESS;

	if ((argc != 1) && (argc != 2))
		return RESULT_SHOWUSAGE;

	ast_mutex_lock(&alsalock);

	if (alsa.owner) {
		if (argc == 2) {
			d = argv[1];
			grab_owner();
			if (alsa.owner) {
				struct ast_frame f = { AST_FRAME_DTMF };
				while (*d) {
					f.subclass = *d;
					ast_queue_frame(alsa.owner, &f);
					d++;
				}
				ast_mutex_unlock(&alsa.owner->lock);
			}
		} else {
			ast_cli(fd, "You're already in a call.  You can use this only to dial digits until you hangup\n");
			res = RESULT_FAILURE;
		}
	} else {
		mye = exten;
		myc = context;
		if (argc == 2) {
			char *stringp = NULL;
			ast_copy_string(tmp, argv[1], 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(fd, "No such extension '%s' in context '%s'\n", mye, myc);
	}

	ast_mutex_unlock(&alsalock);

	return res;
}

static int console_dial(int fd, int argc, char *argv[])
{
	char tmp[256], *tmp2;
	char *mye, *myc;
	char *d;
	int res = RESULT_SUCCESS;

	if ((argc != 2) && (argc != 3))
		return RESULT_SHOWUSAGE;

	ast_mutex_lock(&alsalock);

	if (alsa.owner) {
		if (argc == 3) {
			d = argv[2];
			grab_owner();
			if (alsa.owner) {
				struct ast_frame f = { AST_FRAME_DTMF };
				while (*d) {
					f.subclass = *d;
					ast_queue_frame(alsa.owner, &f);
					d++;
				}
				ast_mutex_unlock(&alsa.owner->lock);
			}
		} else {
			ast_cli(fd, "You're already in a call.  You can use this only to dial digits until you hangup\n");
			res = RESULT_FAILURE;
		}
	} else {
		mye = exten;
		myc = context;
		if (argc == 3) {
			char *stringp = NULL;
			ast_copy_string(tmp, 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(fd, "No such extension '%s' in context '%s'\n", mye, myc);
	}

	ast_mutex_unlock(&alsalock);

	return res;
}

static char dial_usage[] =
	"Usage: console dial [extension[@context]]\n"
	"       Dials a given extension (and context if specified)\n";

static struct ast_cli_entry cli_alsa_answer_deprecated = {
	{ "answer", NULL },
	console_answer_deprecated, NULL,
	NULL };

static struct ast_cli_entry cli_alsa_hangup_deprecated = {
	{ "hangup", NULL },
	console_hangup_deprecated, NULL,
	NULL };

static struct ast_cli_entry cli_alsa_dial_deprecated = {
	{ "dial", NULL },
	console_dial_deprecated, NULL,
	NULL };

static struct ast_cli_entry cli_alsa_send_text_deprecated = {
	{ "send", "text", NULL },
	console_sendtext_deprecated, NULL,
	NULL };

static struct ast_cli_entry cli_alsa_autoanswer_deprecated = {
	{ "autoanswer", NULL },
	console_autoanswer_deprecated, NULL,
	NULL, autoanswer_complete };

static struct ast_cli_entry cli_alsa[] = {
	{ { "console", "answer", NULL },
	console_answer, "Answer an incoming console call",
	answer_usage, NULL, &cli_alsa_answer_deprecated },

	{ { "console", "hangup", NULL },
	console_hangup, "Hangup a call on the console",
	hangup_usage, NULL, &cli_alsa_hangup_deprecated },

	{ { "console", "dial", NULL },
	console_dial, "Dial an extension on the console",
	dial_usage, NULL, &cli_alsa_dial_deprecated },

	{ { "console", "send", "text", NULL },
	console_sendtext, "Send text to the remote device",
	sendtext_usage, NULL, &cli_alsa_send_text_deprecated },

	{ { "console", "autoanswer", NULL },
	console_autoanswer, "Sets/displays autoanswer",
	autoanswer_usage, autoanswer_complete, &cli_alsa_autoanswer_deprecated },
};

static int load_module(void)
{
	int res;
	struct ast_config *cfg;
	struct ast_variable *v;

	/* 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))) {
		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);
	}
	res = pipe(sndcmd);
	if (res) {
		ast_log(LOG_ERROR, "Unable to create pipe\n");
		return -1;
	}
	res = soundcard_init();
	if (res < 0) {
		if (option_verbose > 1) {
			ast_verbose(VERBOSE_PREFIX_2 "No sound card detected -- console channel will be unavailable\n");
			ast_verbose(VERBOSE_PREFIX_2 "Turn off ALSA support by adding 'noload=chan_alsa.so' in /etc/asterisk/modules.conf\n");
		}
		return 0;
	}

	res = ast_channel_register(&alsa_tech);
	if (res < 0) {
		ast_log(LOG_ERROR, "Unable to register channel class 'Console'\n");
		return -1;
	}
	ast_cli_register_multiple(cli_alsa, sizeof(cli_alsa) / sizeof(struct ast_cli_entry));

	ast_pthread_create_background(&sthread, NULL, sound_thread, NULL);
#ifdef ALSA_MONITOR
	if (alsa_monitor_start())
		ast_log(LOG_ERROR, "Problem starting Monitoring\n");
#endif
	return 0;
}

static int unload_module(void)
{
	ast_channel_unregister(&alsa_tech);
	ast_cli_unregister_multiple(cli_alsa, sizeof(cli_alsa) / sizeof(struct ast_cli_entry));

	if (alsa.icard)
		snd_pcm_close(alsa.icard);
	if (alsa.ocard)
		snd_pcm_close(alsa.ocard);
	if (sndcmd[0] > 0) {
		close(sndcmd[0]);
		close(sndcmd[1]);
	}
	if (alsa.owner)
		ast_softhangup(alsa.owner, AST_SOFTHANGUP_APPUNLOAD);
	if (alsa.owner)
		return -1;
	return 0;
}

AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "ALSA Console Channel Driver");