app_talkdetect.c File Reference

Playback a file with audio detect. More...

#include "asterisk.h"
#include "asterisk/lock.h"
#include "asterisk/file.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/module.h"
#include "asterisk/translate.h"
#include "asterisk/utils.h"
#include "asterisk/dsp.h"
#include "asterisk/app.h"
#include "asterisk/format.h"
#include "asterisk/format_cache.h"

Include dependency graph for app_talkdetect.c:

Go to the source code of this file.

Functions
static void	__reg_module (void)
static void	__unreg_module (void)
struct ast_module *	AST_MODULE_SELF_SYM (void)
static int	background_detect_exec (struct ast_channel *chan, const char *data)
static int	load_module (void)
static int	unload_module (void)

Variables
static struct ast_module_info	__mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Playback with Talk Detection" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_DEFAULT, .support_level = AST_MODULE_SUPPORT_CORE, }
static char *	app = "BackgroundDetect"
static const struct ast_module_info *	ast_module_info = &__mod_info

Detailed Description

Playback a file with audio detect.

Author

Mark Spencer marks.nosp@m.ter@.nosp@m.digiu.nosp@m.m.co.nosp@m.m

Definition in file app_talkdetect.c.

Function Documentation

__reg_module()

static void __reg_module ( void  )

static

Definition at line 260 of file app_talkdetect.c.

__unreg_module()

static void __unreg_module ( void  )

static

Definition at line 260 of file app_talkdetect.c.

AST_MODULE_SELF_SYM()

struct ast_module * AST_MODULE_SELF_SYM

(

void

)

Definition at line 260 of file app_talkdetect.c.

background_detect_exec()

static int background_detect_exec ( struct ast_channel *  chan, const char *  data  )

static

Definition at line 83 of file app_talkdetect.c.

{
    int res = 0;
    char *tmp;
    struct ast_frame *fr;
    int notsilent = 0;
    struct timeval start = { 0, 0 };
    struct timeval detection_start = { 0, 0 };
    int sil = 1000;
    int min = 100;
    int max = -1;
    int analysistime = -1;
    int continue_analysis = 1;
    int x;
    RAII_VAR(struct ast_format *, origrformat, NULL, ao2_cleanup);
    struct ast_dsp *dsp = NULL;
    AST_DECLARE_APP_ARGS(args,
        AST_APP_ARG(filename);
        AST_APP_ARG(silence);
        AST_APP_ARG(min);
        AST_APP_ARG(max);
        AST_APP_ARG(analysistime);
    );
 
    if (ast_strlen_zero(data)) {
        ast_log(LOG_WARNING, "BackgroundDetect requires an argument (filename)\n");
        return -1;
    }
 
    tmp = ast_strdupa(data);
    AST_STANDARD_APP_ARGS(args, tmp);
 
    if (!ast_strlen_zero(args.silence) && (sscanf(args.silence, "%30d", &x) == 1) && (x > 0)) {
        sil = x;
    }
    if (!ast_strlen_zero(args.min) && (sscanf(args.min, "%30d", &x) == 1) && (x > 0)) {
        min = x;
    }
    if (!ast_strlen_zero(args.max) && (sscanf(args.max, "%30d", &x) == 1) && (x > 0)) {
        max = x;
    }
    if (!ast_strlen_zero(args.analysistime) && (sscanf(args.analysistime, "%30d", &x) == 1) && (x > 0)) {
        analysistime = x;
    }
 
    ast_debug(1, "Preparing detect of '%s', sil=%d, min=%d, max=%d, analysistime=%d\n", args.filename, sil, min, max, analysistime);
    do {
        if (ast_channel_state(chan) != AST_STATE_UP) {
            if ((res = ast_answer(chan))) {
                break;
            }
        }
 
        origrformat = ao2_bump(ast_channel_readformat(chan));
        if ((ast_set_read_format(chan, ast_format_slin))) {
            ast_log(LOG_WARNING, "Unable to set read format to linear!\n");
            res = -1;
            break;
        }
 
        if (!(dsp = ast_dsp_new())) {
            ast_log(LOG_WARNING, "Unable to allocate DSP!\n");
            res = -1;
            break;
        }
        ast_stopstream(chan);
        if (ast_streamfile(chan, tmp, ast_channel_language(chan))) {
            ast_log(LOG_WARNING, "ast_streamfile failed on %s for %s\n", ast_channel_name(chan), (char *)data);
            break;
        }
        detection_start = ast_tvnow();
        while (ast_channel_stream(chan)) {
            res = ast_sched_wait(ast_channel_sched(chan));
            if ((res < 0) && !ast_channel_timingfunc(chan)) {
                res = 0;
                break;
            }
            if (res < 0) {
                res = 1000;
            }
            res = ast_waitfor(chan, res);
            if (res < 0) {
                ast_log(LOG_WARNING, "Waitfor failed on %s\n", ast_channel_name(chan));
                break;
            } else if (res > 0) {
                fr = ast_read(chan);
                if (continue_analysis && analysistime >= 0) {
                    /* If we have a limit for the time to analyze voice
                     * frames and the time has not expired */
                    if (ast_tvdiff_ms(ast_tvnow(), detection_start) >= analysistime) {
                        continue_analysis = 0;
                        ast_verb(3, "BackgroundDetect: Talk analysis time complete on %s.\n", ast_channel_name(chan));
                    }
                }
 
                if (!fr) {
                    res = -1;
                    break;
                } else if (fr->frametype == AST_FRAME_DTMF) {
                    char t[2];
                    t[0] = fr->subclass.integer;
                    t[1] = '\0';
                    if (ast_canmatch_extension(chan, ast_channel_context(chan), t, 1,
                        S_COR(ast_channel_caller(chan)->id.number.valid, ast_channel_caller(chan)->id.number.str, NULL))) {
                        /* They entered a valid  extension, or might be anyhow */
                        res = fr->subclass.integer;
                        ast_frfree(fr);
                        break;
                    }
                } else if ((fr->frametype == AST_FRAME_VOICE) &&
                (ast_format_cmp(fr->subclass.format, ast_format_slin) == AST_FORMAT_CMP_EQUAL) && continue_analysis) {
                    int totalsilence;
                    int ms;
                    res = ast_dsp_silence(dsp, fr, &totalsilence);
                    if (res && (totalsilence > sil)) {
                        /* We've been quiet a little while */
                        if (notsilent) {
                            /* We had heard some talking */
                            ms = ast_tvdiff_ms(ast_tvnow(), start);
                            ms -= sil;
                            if (ms < 0)
                                ms = 0;
                            if ((ms > min) && ((max < 0) || (ms < max))) {
                                char ms_str[12];
                                ast_debug(1, "Found qualified token of %d ms\n", ms);
 
                                /* Save detected talk time (in milliseconds) */
                                snprintf(ms_str, sizeof(ms_str), "%d", ms);
                                pbx_builtin_setvar_helper(chan, "TALK_DETECTED", ms_str);
 
                                ast_goto_if_exists(chan, ast_channel_context(chan), "talk", 1);
                                res = 0;
                                ast_frfree(fr);
                                break;
                            } else {
                                ast_debug(1, "Found unqualified token of %d ms\n", ms);
                            }
                            notsilent = 0;
                        }
                    } else {
                        if (!notsilent) {
                            /* Heard some audio, mark the begining of the token */
                            start = ast_tvnow();
                            ast_debug(1, "Start of voice token!\n");
                            notsilent = 1;
                        }
                    }
                }
                ast_frfree(fr);
            }
            ast_sched_runq(ast_channel_sched(chan));
        }
        ast_stopstream(chan);
    } while (0);
 
    if (res > -1) {
        if (origrformat && ast_set_read_format(chan, origrformat)) {
            ast_log(LOG_WARNING, "Failed to restore read format for %s to %s\n",
                ast_channel_name(chan), ast_format_get_name(origrformat));
        }
    }
    if (dsp) {
        ast_dsp_free(dsp);
    }
    return res;
}

References ao2_bump, ao2_cleanup, args, ast_answer(), AST_APP_ARG, ast_canmatch_extension(), ast_channel_caller(), ast_channel_context(), ast_channel_language(), ast_channel_name(), ast_channel_readformat(), ast_channel_sched(), ast_channel_stream(), ast_channel_timingfunc(), ast_debug, AST_DECLARE_APP_ARGS, ast_dsp_free(), ast_dsp_new(), ast_dsp_silence(), ast_format_cmp(), AST_FORMAT_CMP_EQUAL, ast_format_get_name(), ast_format_slin, AST_FRAME_DTMF, AST_FRAME_VOICE, ast_frfree, ast_goto_if_exists(), ast_log, ast_read(), ast_sched_runq(), ast_sched_wait(), ast_set_read_format(), AST_STANDARD_APP_ARGS, AST_STATE_UP, ast_stopstream(), ast_strdupa, ast_streamfile(), ast_strlen_zero(), ast_tvdiff_ms(), ast_tvnow(), ast_verb, ast_waitfor(), ast_frame_subclass::format, ast_frame::frametype, ast_frame_subclass::integer, LOG_WARNING, max, min, NULL, pbx_builtin_setvar_helper(), RAII_VAR, S_COR, ast_frame::subclass, and ast_dsp::totalsilence.

Referenced by load_module().

load_module()

static int load_module ( void  )

static

Definition at line 255 of file app_talkdetect.c.

{
    return ast_register_application_xml(app, background_detect_exec);
}

References app, ast_register_application_xml, and background_detect_exec().

unload_module()

static int unload_module ( void  )

static

Definition at line 250 of file app_talkdetect.c.

{
    return ast_unregister_application(app);
}

References app, and ast_unregister_application().

Variable Documentation

__mod_info

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "Playback with Talk Detection" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, .load_pri = AST_MODPRI_DEFAULT, .support_level = AST_MODULE_SUPPORT_CORE, }

static

Definition at line 260 of file app_talkdetect.c.

app

char* app = "BackgroundDetect"

static

Definition at line 81 of file app_talkdetect.c.

Referenced by load_module(), and unload_module().

ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info

static

Definition at line 260 of file app_talkdetect.c.