switch_core_asr.c

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/* 
 * FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
 * Copyright (C) 2005-2014, Anthony Minessale II <anthm@freeswitch.org>
 *
 * Version: MPL 1.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
 *
 * The Initial Developer of the Original Code is
 * Anthony Minessale II <anthm@freeswitch.org>
 * Portions created by the Initial Developer are Copyright (C)
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * 
 * Anthony Minessale II <anthm@freeswitch.org>
 * Michael Jerris <mike@jerris.com>
 * Paul D. Tinsley <pdt at jackhammer.org>
 * Christopher M. Rienzo <chris@rienzo.com>
 * Luke Dashjr <luke@openmethods.com> (OpenMethods, LLC)
 *
 *
 * switch_core_asr.c -- Main Core Library (Speech Detection Interface)
 *
 */

#include <switch.h>
#include "private/switch_core_pvt.h"

SWITCH_DECLARE(switch_status_t) switch_core_asr_open(switch_asr_handle_t *ah,
                                                                                                         const char *module_name,
                                                                                                         const char *codec, int rate, const char *dest, switch_asr_flag_t *flags, switch_memory_pool_t *pool)
{
        switch_status_t status;
        char buf[256] = "";
        char *param = NULL;

        if (strchr(module_name, ':')) {
                switch_set_string(buf, module_name);
                if ((param = strchr(buf, ':'))) {
                        *param++ = '\0';
                        module_name = buf;
                }
        }

        switch_assert(ah != NULL);

        if ((ah->asr_interface = switch_loadable_module_get_asr_interface(module_name)) == 0) {
                switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Invalid ASR module [%s]!\n", module_name);
                return SWITCH_STATUS_GENERR;
        }

        ah->flags = *flags;

        if (pool) {
                ah->memory_pool = pool;
        } else {
                if ((status = switch_core_new_memory_pool(&ah->memory_pool)) != SWITCH_STATUS_SUCCESS) {
                        UNPROTECT_INTERFACE(ah->asr_interface);
                        return status;
                }
                switch_set_flag(ah, SWITCH_ASR_FLAG_FREE_POOL);
        }

        if (param) {
                ah->param = switch_core_strdup(ah->memory_pool, param);
        }
        ah->rate = rate;
        ah->name = switch_core_strdup(ah->memory_pool, module_name);
        ah->samplerate = rate;
        ah->native_rate = rate;

        status = ah->asr_interface->asr_open(ah, codec, rate, dest, flags);

        if (status != SWITCH_STATUS_SUCCESS) {
                UNPROTECT_INTERFACE(ah->asr_interface);
        }

        return status;

}

SWITCH_DECLARE(switch_status_t) switch_core_asr_load_grammar(switch_asr_handle_t *ah, const char *grammar, const char *name)
{
        switch_status_t status = SWITCH_STATUS_SUCCESS;
        char *param_string = NULL;
        char *data = NULL;
        char *lgrammar = NULL;

        switch_assert(ah != NULL);

        if (zstr(grammar)) {
                status = SWITCH_STATUS_FALSE;
                goto done;
        }

        /* Set ASR parameters from params in the grammar string
         * Params are defined as follows {name1=val1,name2=val2,name3=val3}grammar text
         */
        lgrammar = strdup(grammar);
        data = lgrammar;

        /* strip leading spaces */
        while (data && *data == ' ') {
                data++;
        }
        if (zstr(data)) {
                status = SWITCH_STATUS_FALSE;
                goto done;
        }

        /* extract params */
        if (*data == '{') {
                param_string = data + 1;
                data = switch_find_end_paren(data, '{', '}');
                if (zstr(data)) {
                        status = SWITCH_STATUS_FALSE;
                        goto done;
                } else {
                        *data = '\0';
                        data++;
                }
        }

        /* set ASR params */
        if (!zstr(param_string)) {
                char *param[256] = { 0 };
                int i;
                int argc = switch_separate_string(param_string, ',', param, (sizeof(param) / sizeof(param[0])));
                for (i = 0; i < argc && param[i]; ++i) {
                        char *param_pair[2] = { 0 };
                        if (switch_separate_string(param[i], '=', param_pair, (sizeof(param_pair) / sizeof(param_pair[0]))) == 2) {
                                switch_core_asr_text_param(ah, param_pair[0], param_pair[1]);
                        }
                }
        }

        status = ah->asr_interface->asr_load_grammar(ah, data, name);

  done:

        switch_safe_free(lgrammar);
        return status;
}

SWITCH_DECLARE(switch_status_t) switch_core_asr_unload_grammar(switch_asr_handle_t *ah, const char *name)
{
        switch_status_t status;

        switch_assert(ah != NULL);
        status = ah->asr_interface->asr_unload_grammar(ah, name);

        return status;
}

SWITCH_DECLARE(switch_status_t) switch_core_asr_enable_grammar(switch_asr_handle_t *ah, const char *name)
{
        switch_status_t status = SWITCH_STATUS_FALSE;

        switch_assert(ah != NULL);

        if (ah->asr_interface->asr_enable_grammar) {
                status = ah->asr_interface->asr_enable_grammar(ah, name);
        }

        return status;
}

SWITCH_DECLARE(switch_status_t) switch_core_asr_disable_grammar(switch_asr_handle_t *ah, const char *name)
{
        switch_status_t status = SWITCH_STATUS_FALSE;

        switch_assert(ah != NULL);

        if (ah->asr_interface->asr_disable_grammar) {
                status = ah->asr_interface->asr_disable_grammar(ah, name);
        }

        return status;
}

SWITCH_DECLARE(switch_status_t) switch_core_asr_disable_all_grammars(switch_asr_handle_t *ah)
{
        switch_status_t status = SWITCH_STATUS_FALSE;

        switch_assert(ah != NULL);

        if (ah->asr_interface->asr_disable_all_grammars) {
                status = ah->asr_interface->asr_disable_all_grammars(ah);
        }

        return status;
}

SWITCH_DECLARE(switch_status_t) switch_core_asr_pause(switch_asr_handle_t *ah)
{
        switch_assert(ah != NULL);

        return ah->asr_interface->asr_pause(ah);
}

SWITCH_DECLARE(switch_status_t) switch_core_asr_resume(switch_asr_handle_t *ah)
{
        switch_assert(ah != NULL);

        return ah->asr_interface->asr_resume(ah);
}

SWITCH_DECLARE(switch_status_t) switch_core_asr_close(switch_asr_handle_t *ah, switch_asr_flag_t *flags)
{
        switch_status_t status;

        switch_assert(ah != NULL);

        status = ah->asr_interface->asr_close(ah, flags);
        switch_set_flag(ah, SWITCH_ASR_FLAG_CLOSED);

        switch_resample_destroy(&ah->resampler);

        UNPROTECT_INTERFACE(ah->asr_interface);

        if (switch_test_flag(ah, SWITCH_ASR_FLAG_FREE_POOL)) {
                switch_core_destroy_memory_pool(&ah->memory_pool);
        }

        return status;
}

SWITCH_DECLARE(switch_status_t) switch_core_asr_feed(switch_asr_handle_t *ah, void *data, unsigned int len, switch_asr_flag_t *flags)
{
        switch_size_t orig_len = len;
        switch_assert(ah != NULL);

        if (ah->native_rate && ah->samplerate && ah->native_rate != ah->samplerate) {
                if (!ah->resampler) {
                        if (switch_resample_create(&ah->resampler,
                                                                           ah->samplerate, ah->native_rate, (uint32_t) orig_len, SWITCH_RESAMPLE_QUALITY, 1) != SWITCH_STATUS_SUCCESS) {
                                switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_CRIT, "Unable to create resampler!\n");
                                return SWITCH_STATUS_GENERR;
                        }
                }

                switch_resample_process(ah->resampler, data, len / 2);
                if (ah->resampler->to_len > orig_len) {
                        if (!ah->dbuf) {
                                void *mem;
                                ah->dbuflen = ah->resampler->to_len * 2;
                                mem = realloc(ah->dbuf, ah->dbuflen);
                                switch_assert(mem);
                                ah->dbuf = mem;
                        }
                        switch_assert(ah->resampler->to_len * 2 <= ah->dbuflen);
                        memcpy(ah->dbuf, ah->resampler->to, ah->resampler->to_len * 2);
                        data = ah->dbuf;
                } else {
                        memcpy(data, ah->resampler->to, ah->resampler->to_len * 2);
                }

                len = ah->resampler->to_len;
        }

        return ah->asr_interface->asr_feed(ah, data, len, flags);
}

SWITCH_DECLARE(switch_status_t) switch_core_asr_feed_dtmf(switch_asr_handle_t *ah, const switch_dtmf_t *dtmf, switch_asr_flag_t *flags)
{
        switch_status_t status = SWITCH_STATUS_SUCCESS;

        switch_assert(ah != NULL);

        if (ah->asr_interface->asr_feed_dtmf) {
                status = ah->asr_interface->asr_feed_dtmf(ah, dtmf, flags);
        }

        return status;
}

SWITCH_DECLARE(switch_status_t) switch_core_asr_check_results(switch_asr_handle_t *ah, switch_asr_flag_t *flags)
{
        switch_assert(ah != NULL);

        return ah->asr_interface->asr_check_results(ah, flags);
}

SWITCH_DECLARE(switch_status_t) switch_core_asr_get_results(switch_asr_handle_t *ah, char **xmlstr, switch_asr_flag_t *flags)
{
        switch_assert(ah != NULL);

        return ah->asr_interface->asr_get_results(ah, xmlstr, flags);
}

SWITCH_DECLARE(switch_status_t) switch_core_asr_get_result_headers(switch_asr_handle_t *ah, switch_event_t **headers, switch_asr_flag_t *flags)
{
        switch_assert(ah != NULL);

        if (ah->asr_interface->asr_get_result_headers) {
                return ah->asr_interface->asr_get_result_headers(ah, headers, flags);
        } else {
                /* Since this is not always implemented, return success if the function can't be called */
                return SWITCH_STATUS_SUCCESS;
        }
}

SWITCH_DECLARE(switch_status_t) switch_core_asr_start_input_timers(switch_asr_handle_t *ah)
{
        switch_status_t status = SWITCH_STATUS_SUCCESS;

        switch_assert(ah != NULL);

        if (ah->asr_interface->asr_start_input_timers) {
                status = ah->asr_interface->asr_start_input_timers(ah);
        }

        return status;
}

SWITCH_DECLARE(void) switch_core_asr_text_param(switch_asr_handle_t *ah, char *param, const char *val)
{
        switch_assert(ah != NULL);

        if (ah->asr_interface->asr_text_param) {
                ah->asr_interface->asr_text_param(ah, param, val);
        }
}

SWITCH_DECLARE(void) switch_core_asr_numeric_param(switch_asr_handle_t *ah, char *param, int val)
{
        switch_assert(ah != NULL);

        if (ah->asr_interface->asr_numeric_param) {
                ah->asr_interface->asr_numeric_param(ah, param, val);
        }
}

SWITCH_DECLARE(void) switch_core_asr_float_param(switch_asr_handle_t *ah, char *param, double val)
{
        switch_assert(ah != NULL);

        if (ah->asr_interface->asr_float_param) {
                ah->asr_interface->asr_float_param(ah, param, val);
        }
}

/* For Emacs:
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 * For VIM:
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