Thu Dec 17 13:33:57 2009

Asterisk developer's documentation


dsp.h File Reference

Convenient Signal Processing routines. More...

Go to the source code of this file.

Defines

#define DSP_DIGITMODE_DTMF   0
#define DSP_DIGITMODE_MF   1
#define DSP_DIGITMODE_MUTECONF   (1 << 9)
#define DSP_DIGITMODE_MUTEMAX   (1 << 10)
#define DSP_DIGITMODE_NOQUELCH   (1 << 8)
#define DSP_DIGITMODE_RELAXDTMF   (1 << 11)
#define DSP_FEATURE_BUSY_DETECT   (1 << 1)
#define DSP_FEATURE_CALL_PROGRESS   (DSP_PROGRESS_TALK | DSP_PROGRESS_RINGING | DSP_PROGRESS_BUSY | DSP_PROGRESS_CONGESTION)
#define DSP_FEATURE_DTMF_DETECT   (1 << 3)
#define DSP_FEATURE_FAX_DETECT   (1 << 4)
#define DSP_FEATURE_SILENCE_SUPPRESS   (1 << 0)
#define DSP_PROGRESS_BUSY   (1 << 18)
#define DSP_PROGRESS_CONGESTION   (1 << 19)
#define DSP_PROGRESS_RINGING   (1 << 17)
#define DSP_PROGRESS_TALK   (1 << 16)
#define DSP_TONE_STATE_BUSY   4
#define DSP_TONE_STATE_DIALTONE   2
#define DSP_TONE_STATE_HUNGUP   8
#define DSP_TONE_STATE_RINGING   1
#define DSP_TONE_STATE_SILENCE   0
#define DSP_TONE_STATE_SPECIAL1   5
#define DSP_TONE_STATE_SPECIAL2   6
#define DSP_TONE_STATE_SPECIAL3   7
#define DSP_TONE_STATE_TALKING   3

Functions

int ast_dsp_busydetect (struct ast_dsp *dsp)
 Return non-zero if historically this should be a busy, request that ast_dsp_silence has already been called.
int ast_dsp_call_progress (struct ast_dsp *dsp, struct ast_frame *inf)
 Scans for progress indication in audio.
int ast_dsp_digitdetect (struct ast_dsp *dsp, struct ast_frame *f)
 Return non-zero if DTMF hit was found.
int ast_dsp_digitmode (struct ast_dsp *dsp, int digitmode)
 Set digit mode.
void ast_dsp_digitreset (struct ast_dsp *dsp)
 Reset DTMF detector.
void ast_dsp_free (struct ast_dsp *dsp)
int ast_dsp_get_tcount (struct ast_dsp *dsp)
 Get tcount (Threshold counter).
int ast_dsp_get_tstate (struct ast_dsp *dsp)
 Get tstate (Tone State).
int ast_dsp_getdigits (struct ast_dsp *dsp, char *buf, int max)
 Get pending DTMF/MF digits.
ast_dspast_dsp_new (void)
ast_frameast_dsp_process (struct ast_channel *chan, struct ast_dsp *dsp, struct ast_frame *inf)
 Return AST_FRAME_NULL frames when there is silence, AST_FRAME_BUSY on busies, and call progress, all dependent upon which features are enabled.
void ast_dsp_reset (struct ast_dsp *dsp)
 Reset total silence count.
void ast_dsp_set_busy_compare (struct ast_dsp *dsp, int compare)
 Set if silence and noice lengths must be compared for busy.
void ast_dsp_set_busy_count (struct ast_dsp *dsp, int cadences)
 Set number of required cadences for busy.
void ast_dsp_set_busy_pattern (struct ast_dsp *dsp, int tonelength, int quietlength, int fuzzy)
 Set expected lengths of the busy tones.
int ast_dsp_set_call_progress_zone (struct ast_dsp *dsp, char *zone)
 Set zone for doing progress detection.
void ast_dsp_set_features (struct ast_dsp *dsp, int features)
 Select feature set.
void ast_dsp_set_threshold (struct ast_dsp *dsp, int threshold)
 Set threshold value for silence.
int ast_dsp_silence (struct ast_dsp *dsp, struct ast_frame *f, int *totalsilence)
 Return non-zero if this is silence. Updates "totalsilence" with the total number of seconds of silence.


Detailed Description

Convenient Signal Processing routines.

Definition in file dsp.h.


Define Documentation

#define DSP_DIGITMODE_DTMF   0

Definition at line 31 of file dsp.h.

Referenced by ast_dsp_digitmode(), dahdi_hangup(), dahdi_new(), dahdi_setoption(), sip_new(), and ss_thread().

#define DSP_DIGITMODE_MF   1

Definition at line 32 of file dsp.h.

Referenced by __ast_dsp_digitdetect(), ast_dsp_digitmode(), ast_dsp_digitreset(), ast_dsp_getdigits(), ast_dsp_process(), and ss_thread().

#define DSP_DIGITMODE_MUTECONF   (1 << 9)

Definition at line 35 of file dsp.h.

Referenced by ast_dsp_digitmode(), ast_dsp_process(), and dahdi_setoption().

#define DSP_DIGITMODE_MUTEMAX   (1 << 10)

Definition at line 36 of file dsp.h.

Referenced by ast_dsp_digitmode(), ast_dsp_process(), and dahdi_setoption().

#define DSP_DIGITMODE_NOQUELCH   (1 << 8)

Definition at line 34 of file dsp.h.

Referenced by dtmf_detect(), mf_detect(), and mgcp_new().

#define DSP_DIGITMODE_RELAXDTMF   (1 << 11)

Definition at line 37 of file dsp.h.

Referenced by __ast_dsp_digitdetect(), dahdi_setoption(), process_dahdi(), and sip_new().

#define DSP_FEATURE_BUSY_DETECT   (1 << 1)

Definition at line 27 of file dsp.h.

Referenced by ast_dsp_process(), and dahdi_new().

#define DSP_FEATURE_CALL_PROGRESS   (DSP_PROGRESS_TALK | DSP_PROGRESS_RINGING | DSP_PROGRESS_BUSY | DSP_PROGRESS_CONGESTION)

Definition at line 43 of file dsp.h.

Referenced by __ast_dsp_call_progress(), ast_dsp_process(), and dahdi_new().

#define DSP_FEATURE_DTMF_DETECT   (1 << 3)

Definition at line 28 of file dsp.h.

Referenced by __oh323_new(), ast_dsp_process(), dahdi_new(), disable_dtmf_detect(), enable_dtmf_detect(), mgcp_new(), misdn_set_opt_exec(), read_config(), sip_dtmfmode(), and sip_new().

#define DSP_FEATURE_FAX_DETECT   (1 << 4)

Definition at line 29 of file dsp.h.

Referenced by __ast_dsp_digitdetect(), dahdi_new(), misdn_set_opt_exec(), and read_config().

#define DSP_FEATURE_SILENCE_SUPPRESS   (1 << 0)

Definition at line 26 of file dsp.h.

Referenced by ast_dsp_new(), and ast_dsp_process().

#define DSP_PROGRESS_BUSY   (1 << 18)

Definition at line 41 of file dsp.h.

Referenced by __ast_dsp_call_progress().

#define DSP_PROGRESS_CONGESTION   (1 << 19)

Definition at line 42 of file dsp.h.

Referenced by __ast_dsp_call_progress().

#define DSP_PROGRESS_RINGING   (1 << 17)

Definition at line 40 of file dsp.h.

Referenced by __ast_dsp_call_progress().

#define DSP_PROGRESS_TALK   (1 << 16)

Definition at line 39 of file dsp.h.

Referenced by __ast_dsp_call_progress(), and dahdi_new().

#define DSP_TONE_STATE_BUSY   4

Definition at line 49 of file dsp.h.

Referenced by __ast_dsp_call_progress().

#define DSP_TONE_STATE_DIALTONE   2

Definition at line 47 of file dsp.h.

Referenced by __ast_dsp_call_progress().

#define DSP_TONE_STATE_HUNGUP   8

Definition at line 53 of file dsp.h.

Referenced by __ast_dsp_call_progress().

#define DSP_TONE_STATE_RINGING   1

Definition at line 46 of file dsp.h.

Referenced by __ast_dsp_call_progress().

#define DSP_TONE_STATE_SILENCE   0

Definition at line 45 of file dsp.h.

Referenced by __ast_dsp_call_progress().

#define DSP_TONE_STATE_SPECIAL1   5

Definition at line 50 of file dsp.h.

Referenced by __ast_dsp_call_progress().

#define DSP_TONE_STATE_SPECIAL2   6

Definition at line 51 of file dsp.h.

Referenced by __ast_dsp_call_progress().

#define DSP_TONE_STATE_SPECIAL3   7

Definition at line 52 of file dsp.h.

Referenced by __ast_dsp_call_progress().

#define DSP_TONE_STATE_TALKING   3

Definition at line 48 of file dsp.h.

Referenced by __ast_dsp_call_progress().


Function Documentation

int ast_dsp_busydetect ( struct ast_dsp dsp  ) 

Return non-zero if historically this should be a busy, request that ast_dsp_silence has already been called.

Definition at line 1282 of file dsp.c.

References ast_log(), BUSY_MAX, BUSY_MIN, ast_dsp::busy_pattern_fuzzy, BUSY_PERCENT, ast_dsp::busy_quietlength, ast_dsp::busy_tonelength, ast_dsp::busycompare, ast_dsp::busycount, ast_dsp::busymaybe, ast_dsp::busytoneonly, DSP_HISTORY, ast_dsp::historicnoise, ast_dsp::historicsilence, LOG_DEBUG, LOG_ERROR, LOG_NOTICE, and option_debug.

Referenced by ast_dsp_process().

01283 {
01284    int res = 0, x;
01285    int avgsilence = 0, hitsilence = 0;
01286    int avgtone = 0, hittone = 0;
01287 #ifdef DEBUG_DSP_BUSYDETECT
01288    char buf[16];
01289    char silence_list[64]="", tone_list[64]="";
01290 #endif
01291    
01292    if (!dsp->busymaybe)
01293       return res;
01294    dsp->busymaybe = 0;
01295 
01296    for (x=DSP_HISTORY - dsp->busycount;x<DSP_HISTORY;x++) {
01297       avgsilence += dsp->historicsilence[x];
01298       avgtone += dsp->historicnoise[x];
01299    }
01300    avgsilence /= dsp->busycount;
01301    avgtone /= dsp->busycount;
01302 #ifdef DEBUG_DSP_BUSYDETECT
01303    sprintf(silence_list,"Silences: ");
01304    sprintf(tone_list,"Tones:    ");
01305 #endif
01306    for (x=DSP_HISTORY - dsp->busycount; x<DSP_HISTORY; x++) {
01307 #ifdef DEBUG_DSP_BUSYDETECT
01308       snprintf(buf, sizeof(buf), "%5d ", dsp->historicsilence[x]);
01309       strcat(silence_list, buf);
01310       snprintf(buf, sizeof(buf), "%5d ", dsp->historicnoise[x]);
01311       strcat(tone_list, buf); 
01312 #endif
01313       if (!dsp->busytoneonly) {
01314          if (avgsilence > dsp->historicsilence[x]) {
01315             if (avgsilence - (avgsilence*BUSY_PERCENT/100) <= dsp->historicsilence[x])
01316                hitsilence++;
01317          } else {
01318             if (avgsilence + (avgsilence*BUSY_PERCENT/100) >= dsp->historicsilence[x])
01319                hitsilence++;
01320          }
01321       }
01322       if (avgtone > dsp->historicnoise[x]) {
01323          if (avgtone - (avgtone*BUSY_PERCENT/100) <= dsp->historicnoise[x])
01324             hittone++;
01325       } else {
01326          if (avgtone + (avgtone*BUSY_PERCENT/100) >= dsp->historicnoise[x])
01327             hittone++;
01328       }
01329    }
01330 #ifdef DEBUG_DSP_BUSYDETECT
01331    fprintf(stderr, "BUSY DETECTOR\n");   
01332    fprintf(stderr, "%s\n", tone_list);
01333    fprintf(stderr, "%s\n", silence_list)
01334 #endif
01335    if ((dsp->busytoneonly || 
01336        (hitsilence >= dsp->busycount - 1 && avgsilence >= BUSY_MIN && avgsilence <= BUSY_MAX)) &&
01337       (hittone >= dsp->busycount - 1 && avgtone >= BUSY_MIN && avgtone <= BUSY_MAX)) {
01338       if (dsp->busycompare) {
01339            if (dsp->busytoneonly) {
01340              res = 1;
01341             ast_log(LOG_ERROR, "You can't use busytoneonly together with busycompare");
01342          } else {
01343               if (avgtone > avgsilence) {
01344                  if (avgtone - avgtone*BUSY_PERCENT/100 <= avgsilence)
01345                     res = 1;
01346             } else {
01347                  if (avgtone + avgtone*BUSY_PERCENT/100 >= avgsilence)
01348                    res = 1;
01349             }
01350          }
01351       } else {
01352          res = 1;
01353       }
01354    }
01355    /* If we know the expected busy tone length, check we are in the range */
01356    if (res && (dsp->busy_tonelength > 0)) {
01357       if (abs(avgtone - dsp->busy_tonelength) > (dsp->busy_tonelength*dsp->busy_pattern_fuzzy/100)) {
01358          if(option_debug) {
01359             ast_log(LOG_DEBUG, "busy detector: avgtone of %d not close enough to desired %d\n", avgtone, dsp->busy_tonelength);
01360          }
01361          res = 0;
01362       }
01363    }
01364    /* If we know the expected busy tone silent-period length, check we are in the range */
01365    if (res && (!dsp->busytoneonly) && (dsp->busy_quietlength > 0)) {
01366       if (abs(avgsilence - dsp->busy_quietlength) > (dsp->busy_quietlength*dsp->busy_pattern_fuzzy/100)) {
01367          if(option_debug) {
01368             ast_log(LOG_DEBUG, "busy detector: avgsilence of %d not close enough to desired %d\n", avgsilence, dsp->busy_quietlength);
01369          }
01370          res = 0;
01371       }
01372    }
01373    if (res && option_debug)
01374       ast_log(LOG_NOTICE, "Detected busy sequence, avgtone: %d, avgsilence %d\n", avgtone, avgsilence);
01375    return res;
01376 }

int ast_dsp_call_progress ( struct ast_dsp dsp,
struct ast_frame inf 
)

Scans for progress indication in audio.

Definition at line 1211 of file dsp.c.

References __ast_dsp_call_progress(), AST_FORMAT_SLINEAR, AST_FRAME_VOICE, ast_log(), ast_frame::data, ast_frame::datalen, ast_frame::frametype, LOG_WARNING, and ast_frame::subclass.

01212 {
01213    if (inf->frametype != AST_FRAME_VOICE) {
01214       ast_log(LOG_WARNING, "Can't check call progress of non-voice frames\n");
01215       return 0;
01216    }
01217    if (inf->subclass != AST_FORMAT_SLINEAR) {
01218       ast_log(LOG_WARNING, "Can only check call progress in signed-linear frames\n");
01219       return 0;
01220    }
01221    return __ast_dsp_call_progress(dsp, inf->data, inf->datalen / 2);
01222 }

int ast_dsp_digitdetect ( struct ast_dsp dsp,
struct ast_frame f 
)

Return non-zero if DTMF hit was found.

Definition at line 1010 of file dsp.c.

References __ast_dsp_digitdetect(), AST_FORMAT_SLINEAR, AST_FRAME_VOICE, ast_log(), ast_frame::data, ast_frame::datalen, ast_frame::frametype, len(), LOG_WARNING, s, and ast_frame::subclass.

01011 {
01012    short *s;
01013    int len;
01014    int ign=0;
01015 
01016    if (inf->frametype != AST_FRAME_VOICE) {
01017       ast_log(LOG_WARNING, "Can't check call progress of non-voice frames\n");
01018       return 0;
01019    }
01020    if (inf->subclass != AST_FORMAT_SLINEAR) {
01021       ast_log(LOG_WARNING, "Can only check call progress in signed-linear frames\n");
01022       return 0;
01023    }
01024    s = inf->data;
01025    len = inf->datalen / 2;
01026    return __ast_dsp_digitdetect(dsp, s, len, &ign);
01027 }

int ast_dsp_digitmode ( struct ast_dsp dsp,
int  digitmode 
)

Set digit mode.

Definition at line 1789 of file dsp.c.

References ast_dtmf_detect_init(), ast_mf_detect_init(), ast_dsp::digitmode, DSP_DIGITMODE_DTMF, DSP_DIGITMODE_MF, DSP_DIGITMODE_MUTECONF, DSP_DIGITMODE_MUTEMAX, ast_dsp::dtmf, ast_dsp::mf, and ast_dsp::td.

Referenced by dahdi_hangup(), dahdi_new(), dahdi_setoption(), mgcp_new(), sip_new(), and ss_thread().

01790 {
01791    int new;
01792    int old;
01793    
01794    old = dsp->digitmode & (DSP_DIGITMODE_DTMF | DSP_DIGITMODE_MF | DSP_DIGITMODE_MUTECONF | DSP_DIGITMODE_MUTEMAX);
01795    new = digitmode & (DSP_DIGITMODE_DTMF | DSP_DIGITMODE_MF | DSP_DIGITMODE_MUTECONF | DSP_DIGITMODE_MUTEMAX);
01796    if (old != new) {
01797       /* Must initialize structures if switching from MF to DTMF or vice-versa */
01798       if (new & DSP_DIGITMODE_MF)
01799          ast_mf_detect_init(&dsp->td.mf);
01800       else
01801          ast_dtmf_detect_init(&dsp->td.dtmf);
01802    }
01803    dsp->digitmode = digitmode;
01804    return 0;
01805 }

void ast_dsp_digitreset ( struct ast_dsp dsp  ) 

Reset DTMF detector.

Definition at line 1726 of file dsp.c.

References dtmf_detect_state_t::col_out, dtmf_detect_state_t::current_digits, mf_detect_state_t::current_digits, dtmf_detect_state_t::current_sample, mf_detect_state_t::current_sample, ast_dsp::digitmode, dtmf_detect_state_t::digits, mf_detect_state_t::digits, DSP_DIGITMODE_MF, ast_dsp::dtmf, dtmf_detect_state_t::energy, dtmf_detect_state_t::fax_tone, goertzel_reset(), mf_detect_state_t::hits, dtmf_detect_state_t::lasthit, ast_dsp::mf, dtmf_detect_state_t::mhit, mf_detect_state_t::mhit, dtmf_detect_state_t::row_out, ast_dsp::td, ast_dsp::thinkdigit, and mf_detect_state_t::tone_out.

Referenced by ss_thread().

01727 {
01728    int i;
01729    
01730    dsp->thinkdigit = 0;
01731    if (dsp->digitmode & DSP_DIGITMODE_MF) {
01732       memset(dsp->td.mf.digits, 0, sizeof(dsp->td.mf.digits));
01733       dsp->td.mf.current_digits = 0;
01734       /* Reinitialise the detector for the next block */
01735       for (i = 0;  i < 6;  i++) {
01736          goertzel_reset(&dsp->td.mf.tone_out[i]);
01737 #ifdef OLD_DSP_ROUTINES
01738          goertzel_reset(&dsp->td.mf.tone_out2nd[i]);
01739 #endif         
01740       }
01741 #ifdef OLD_DSP_ROUTINES
01742       dsp->td.mf.energy = 0.0;
01743       dsp->td.mf.hit1 = dsp->td.mf.hit2 = dsp->td.mf.hit3 = dsp->td.mf.hit4 = dsp->td.mf.mhit = 0;
01744 #else
01745       dsp->td.mf.hits[4] = dsp->td.mf.hits[3] = dsp->td.mf.hits[2] = dsp->td.mf.hits[1] = dsp->td.mf.hits[0] = dsp->td.mf.mhit = 0;
01746 #endif      
01747       dsp->td.mf.current_sample = 0;
01748    } else {
01749       memset(dsp->td.dtmf.digits, 0, sizeof(dsp->td.dtmf.digits));
01750       dsp->td.dtmf.current_digits = 0;
01751       /* Reinitialise the detector for the next block */
01752       for (i = 0;  i < 4;  i++) {
01753          goertzel_reset(&dsp->td.dtmf.row_out[i]);
01754          goertzel_reset(&dsp->td.dtmf.col_out[i]);
01755 #ifdef OLD_DSP_ROUTINES
01756          goertzel_reset(&dsp->td.dtmf.row_out2nd[i]);
01757          goertzel_reset(&dsp->td.dtmf.col_out2nd[i]);
01758 #endif         
01759       }
01760 #ifdef FAX_DETECT
01761       goertzel_reset (&dsp->td.dtmf.fax_tone);
01762 #endif
01763 #ifdef OLD_DSP_ROUTINES
01764 #ifdef FAX_DETECT
01765       goertzel_reset (&dsp->td.dtmf.fax_tone2nd);
01766 #endif
01767       dsp->td.dtmf.hit1 = dsp->td.dtmf.hit2 = dsp->td.dtmf.hit3 = dsp->td.dtmf.hit4 = dsp->td.dtmf.mhit = 0;
01768 #else
01769       dsp->td.dtmf.lasthit = dsp->td.dtmf.mhit = 0;
01770 #endif      
01771       dsp->td.dtmf.energy = 0.0;
01772       dsp->td.dtmf.current_sample = 0;
01773    }
01774 }

void ast_dsp_free ( struct ast_dsp dsp  ) 

Definition at line 1684 of file dsp.c.

References free.

Referenced by __ast_play_and_record(), __oh323_destroy(), background_detect_exec(), cl_dequeue_chan(), cleanup_connection(), dahdi_hangup(), do_waiting(), handle_recordfile(), isAnsweringMachine(), mgcp_hangup(), sip_dtmfmode(), sip_hangup(), and ss_thread().

01685 {
01686    free(dsp);
01687 }

int ast_dsp_get_tcount ( struct ast_dsp dsp  ) 

Get tcount (Threshold counter).

Definition at line 1826 of file dsp.c.

References ast_dsp::tcount.

01827 {
01828    return dsp->tcount;
01829 }

int ast_dsp_get_tstate ( struct ast_dsp dsp  ) 

Get tstate (Tone State).

Definition at line 1821 of file dsp.c.

References ast_dsp::tstate.

01822 {
01823    return dsp->tstate;
01824 }

int ast_dsp_getdigits ( struct ast_dsp dsp,
char *  buf,
int  max 
)

Get pending DTMF/MF digits.

Definition at line 1049 of file dsp.c.

References dtmf_detect_state_t::current_digits, mf_detect_state_t::current_digits, ast_dsp::digitmode, dtmf_detect_state_t::digits, mf_detect_state_t::digits, DSP_DIGITMODE_MF, ast_dsp::dtmf, ast_dsp::mf, and ast_dsp::td.

01050 {
01051    if (dsp->digitmode & DSP_DIGITMODE_MF) {
01052       if (max > dsp->td.mf.current_digits)
01053          max = dsp->td.mf.current_digits;
01054       if (max > 0) {
01055          memcpy(buf, dsp->td.mf.digits, max);
01056          memmove(dsp->td.mf.digits, dsp->td.mf.digits + max, dsp->td.mf.current_digits - max);
01057          dsp->td.mf.current_digits -= max;
01058       }
01059       buf[max] = '\0';
01060       return  max;
01061    } else {
01062       if (max > dsp->td.dtmf.current_digits)
01063          max = dsp->td.dtmf.current_digits;
01064       if (max > 0) {
01065          memcpy (buf, dsp->td.dtmf.digits, max);
01066          memmove (dsp->td.dtmf.digits, dsp->td.dtmf.digits + max, dsp->td.dtmf.current_digits - max);
01067          dsp->td.dtmf.current_digits -= max;
01068       }
01069       buf[max] = '\0';
01070       return  max;
01071    }
01072 }

struct ast_dsp* ast_dsp_new ( void   ) 

Definition at line 1649 of file dsp.c.

References ast_calloc, ast_dsp_prog_reset(), ast_dtmf_detect_init(), BUSY_PAT_PERCENT, DEFAULT_THRESHOLD, DSP_FEATURE_SILENCE_SUPPRESS, DSP_HISTORY, and ast_dsp::threshold.

Referenced by __ast_play_and_record(), __oh323_new(), background_detect_exec(), conf_run(), dahdi_new(), do_waiting(), handle_recordfile(), isAnsweringMachine(), mgcp_new(), misdn_set_opt_exec(), read_config(), sip_dtmfmode(), and sip_new().

01650 {
01651    struct ast_dsp *dsp;
01652    
01653    if ((dsp = ast_calloc(1, sizeof(*dsp)))) {      
01654       dsp->threshold = DEFAULT_THRESHOLD;
01655       dsp->features = DSP_FEATURE_SILENCE_SUPPRESS;
01656       dsp->busycount = DSP_HISTORY;
01657       dsp->busy_pattern_fuzzy = BUSY_PAT_PERCENT;
01658 #ifdef BUSYDETECT_TONEONLY
01659       dsp->busytoneonly = 1;
01660 #ifdef BUSYDETECT_COMPARE_TONE_AND_SILENCE
01661 #error "You can't use BUSYDETECT_TONEONLY together with BUSYDETECT_COMPARE_TONE_AND_SILENCE");
01662 #endif
01663 #else
01664    dsp->busytoneonly = 0;
01665 #ifdef BUSYDETECT_COMPARE_TONE_AND_SILENCE
01666    dsp->busycompare = 1;
01667 #else
01668    dsp->busycompare = 0;
01669 #endif
01670 #endif
01671       /* Initialize DTMF detector */
01672       ast_dtmf_detect_init(&dsp->td.dtmf);
01673       /* Initialize initial DSP progress detect parameters */
01674       ast_dsp_prog_reset(dsp);
01675    }
01676    return dsp;
01677 }

struct ast_frame* ast_dsp_process ( struct ast_channel chan,
struct ast_dsp dsp,
struct ast_frame inf 
)

Return AST_FRAME_NULL frames when there is silence, AST_FRAME_BUSY on busies, and call progress, all dependent upon which features are enabled.

Definition at line 1442 of file dsp.c.

References __ast_dsp_call_progress(), __ast_dsp_digitdetect(), __ast_dsp_silence(), ast_channel::_softhangup, AST_ALAW, AST_CONTROL_ANSWER, AST_CONTROL_BUSY, AST_CONTROL_CONGESTION, AST_CONTROL_HANGUP, AST_CONTROL_RINGING, ast_dsp_busydetect(), AST_FORMAT_ALAW, AST_FORMAT_SLINEAR, AST_FORMAT_ULAW, AST_FRAME_CONTROL, AST_FRAME_DTMF, AST_FRAME_DTMF_BEGIN, AST_FRAME_DTMF_END, AST_FRAME_NULL, AST_FRAME_VOICE, ast_frfree, ast_frisolate(), ast_getformatname(), ast_log(), AST_MULAW, ast_queue_frame(), AST_SOFTHANGUP_DEV, dtmf_detect_state_t::current_digits, mf_detect_state_t::current_digits, ast_frame::data, ast_frame::datalen, ast_dsp::digitmode, dtmf_detect_state_t::digits, mf_detect_state_t::digits, DSP_DIGITMODE_MF, DSP_DIGITMODE_MUTECONF, DSP_DIGITMODE_MUTEMAX, DSP_FEATURE_BUSY_DETECT, DSP_FEATURE_CALL_PROGRESS, DSP_FEATURE_DTMF_DETECT, DSP_FEATURE_SILENCE_SUPPRESS, ast_dsp::dtmf, ast_dsp::f, ast_dsp::features, FIX_INF, ast_frame::frametype, len(), LOG_WARNING, ast_dsp::mf, silence, ast_frame::src, ast_frame::subclass, ast_dsp::td, and ast_dsp::thinkdigit.

Referenced by dahdi_read(), mgcp_rtp_read(), oh323_rtp_read(), process_ast_dsp(), and sip_rtp_read().

01443 {
01444    int silence;
01445    int res;
01446    int digit;
01447    int x;
01448    short *shortdata;
01449    unsigned char *odata;
01450    int len;
01451    int writeback = 0;
01452 
01453 #define FIX_INF(inf) do { \
01454       if (writeback) { \
01455          switch(inf->subclass) { \
01456          case AST_FORMAT_SLINEAR: \
01457             break; \
01458          case AST_FORMAT_ULAW: \
01459             for (x=0;x<len;x++) \
01460                odata[x] = AST_LIN2MU((unsigned short)shortdata[x]); \
01461             break; \
01462          case AST_FORMAT_ALAW: \
01463             for (x=0;x<len;x++) \
01464                odata[x] = AST_LIN2A((unsigned short)shortdata[x]); \
01465             break; \
01466          } \
01467       } \
01468    } while(0) 
01469 
01470    if (!af)
01471       return NULL;
01472    if (af->frametype != AST_FRAME_VOICE)
01473       return af;
01474    odata = af->data;
01475    len = af->datalen;
01476    /* Make sure we have short data */
01477    switch(af->subclass) {
01478    case AST_FORMAT_SLINEAR:
01479       shortdata = af->data;
01480       len = af->datalen / 2;
01481       break;
01482    case AST_FORMAT_ULAW:
01483       shortdata = alloca(af->datalen * 2);
01484       for (x = 0;x < len; x++) 
01485          shortdata[x] = AST_MULAW(odata[x]);
01486       break;
01487    case AST_FORMAT_ALAW:
01488       shortdata = alloca(af->datalen * 2);
01489       for (x = 0; x < len; x++) 
01490          shortdata[x] = AST_ALAW(odata[x]);
01491       break;
01492    default:
01493       ast_log(LOG_WARNING, "Inband DTMF is not supported on codec %s. Use RFC2833\n", ast_getformatname(af->subclass));
01494       return af;
01495    }
01496    silence = __ast_dsp_silence(dsp, shortdata, len, NULL);
01497    if ((dsp->features & DSP_FEATURE_SILENCE_SUPPRESS) && silence) {
01498       memset(&dsp->f, 0, sizeof(dsp->f));
01499       dsp->f.frametype = AST_FRAME_NULL;
01500       ast_frfree(af);
01501       return ast_frisolate(&dsp->f);
01502    }
01503    if ((dsp->features & DSP_FEATURE_BUSY_DETECT) && ast_dsp_busydetect(dsp)) {
01504       chan->_softhangup |= AST_SOFTHANGUP_DEV;
01505       memset(&dsp->f, 0, sizeof(dsp->f));
01506       dsp->f.frametype = AST_FRAME_CONTROL;
01507       dsp->f.subclass = AST_CONTROL_BUSY;
01508       ast_frfree(af);
01509       return ast_frisolate(&dsp->f);
01510    }
01511    if ((dsp->features & DSP_FEATURE_DTMF_DETECT)) {
01512       digit = __ast_dsp_digitdetect(dsp, shortdata, len, &writeback);
01513 #if 0
01514       if (digit)
01515          printf("Performing digit detection returned %d, digitmode is %d\n", digit, dsp->digitmode);
01516 #endif         
01517       if (dsp->digitmode & (DSP_DIGITMODE_MUTECONF | DSP_DIGITMODE_MUTEMAX)) {
01518          if (!dsp->thinkdigit) {
01519             if (digit) {
01520                /* Looks like we might have something.  
01521                 * Request a conference mute for the moment */
01522                memset(&dsp->f, 0, sizeof(dsp->f));
01523                dsp->f.frametype = AST_FRAME_DTMF;
01524                dsp->f.subclass = 'm';
01525                dsp->thinkdigit = 'x';
01526                FIX_INF(af);
01527                if (chan)
01528                   ast_queue_frame(chan, af);
01529                ast_frfree(af);
01530                return ast_frisolate(&dsp->f);
01531             }
01532          } else {
01533             if (digit) {
01534                /* Thought we saw one last time.  Pretty sure we really have now */
01535                if ((dsp->thinkdigit != 'x') && (dsp->thinkdigit != digit)) {
01536                   /* If we found a digit, and we're changing digits, go
01537                      ahead and send this one, but DON'T stop confmute because
01538                      we're detecting something else, too... */
01539                   memset(&dsp->f, 0, sizeof(dsp->f));
01540                   dsp->f.frametype = AST_FRAME_DTMF_END;
01541                   dsp->f.subclass = dsp->thinkdigit;
01542                   FIX_INF(af);
01543                   if (chan)
01544                      ast_queue_frame(chan, af);
01545                   ast_frfree(af);
01546                } else {
01547                   dsp->thinkdigit = digit;
01548                   memset(&dsp->f, 0, sizeof(dsp->f));
01549                   dsp->f.frametype = AST_FRAME_DTMF_BEGIN;
01550                   dsp->f.subclass = dsp->thinkdigit;
01551                   FIX_INF(af);
01552                   if (chan)
01553                      ast_queue_frame(chan, af);
01554                   ast_frfree(af);
01555                }
01556                return ast_frisolate(&dsp->f);
01557             } else {
01558                memset(&dsp->f, 0, sizeof(dsp->f));
01559                if (dsp->thinkdigit != 'x') {
01560                   /* If we found a digit, send it now */
01561                   dsp->f.frametype = AST_FRAME_DTMF_END;
01562                   dsp->f.subclass = dsp->thinkdigit;
01563                   dsp->thinkdigit = 0;
01564                } else {
01565                   dsp->f.frametype = AST_FRAME_DTMF;
01566                   dsp->f.subclass = 'u';
01567                   dsp->thinkdigit = 0;
01568                }
01569                FIX_INF(af);
01570                if (chan)
01571                   ast_queue_frame(chan, af);
01572                ast_frfree(af);
01573                return ast_frisolate(&dsp->f);
01574             }
01575          }
01576       } else if (!digit) {
01577          /* Only check when there is *not* a hit... */
01578          if (dsp->digitmode & DSP_DIGITMODE_MF) {
01579             if (dsp->td.mf.current_digits) {
01580                memset(&dsp->f, 0, sizeof(dsp->f));
01581                dsp->f.frametype = AST_FRAME_DTMF;
01582                dsp->f.subclass = dsp->td.mf.digits[0];
01583                memmove(dsp->td.mf.digits, dsp->td.mf.digits + 1, dsp->td.mf.current_digits);
01584                dsp->td.mf.current_digits--;
01585                FIX_INF(af);
01586                if (chan)
01587                   ast_queue_frame(chan, af);
01588                ast_frfree(af);
01589                return ast_frisolate(&dsp->f);
01590             }
01591          } else {
01592             if (dsp->td.dtmf.current_digits) {
01593                memset(&dsp->f, 0, sizeof(dsp->f));
01594                dsp->f.frametype = AST_FRAME_DTMF_END;
01595                dsp->f.subclass = dsp->td.dtmf.digits[0];
01596                memmove(dsp->td.dtmf.digits, dsp->td.dtmf.digits + 1, dsp->td.dtmf.current_digits);
01597                dsp->td.dtmf.current_digits--;
01598                FIX_INF(af);
01599                if (chan)
01600                   ast_queue_frame(chan, af);
01601                ast_frfree(af);
01602                return ast_frisolate(&dsp->f);
01603             }
01604          }
01605       }
01606    }
01607    if ((dsp->features & DSP_FEATURE_CALL_PROGRESS)) {
01608       res = __ast_dsp_call_progress(dsp, shortdata, len);
01609       if (res) {
01610          switch(res) {
01611          case AST_CONTROL_ANSWER:
01612          case AST_CONTROL_BUSY:
01613          case AST_CONTROL_RINGING:
01614          case AST_CONTROL_CONGESTION:
01615          case AST_CONTROL_HANGUP:
01616             memset(&dsp->f, 0, sizeof(dsp->f));
01617             dsp->f.frametype = AST_FRAME_CONTROL;
01618             dsp->f.subclass = res;
01619             dsp->f.src = "dsp_progress";
01620             if (chan) 
01621                ast_queue_frame(chan, &dsp->f);
01622             break;
01623          default:
01624             ast_log(LOG_WARNING, "Don't know how to represent call progress message %d\n", res);
01625          }
01626       }
01627    }
01628    FIX_INF(af);
01629    return af;
01630 }

void ast_dsp_reset ( struct ast_dsp dsp  ) 

Reset total silence count.

Definition at line 1776 of file dsp.c.

References ast_dsp::freqs, ast_dsp::gsamps, ast_dsp::historicnoise, ast_dsp::historicsilence, ast_dsp::ringtimeout, ast_dsp::totalsilence, goertzel_state_t::v2, and goertzel_state_t::v3.

01777 {
01778    int x;
01779    
01780    dsp->totalsilence = 0;
01781    dsp->gsamps = 0;
01782    for (x=0;x<4;x++)
01783       dsp->freqs[x].v2 = dsp->freqs[x].v3 = 0.0;
01784    memset(dsp->historicsilence, 0, sizeof(dsp->historicsilence));
01785    memset(dsp->historicnoise, 0, sizeof(dsp->historicnoise));  
01786    dsp->ringtimeout= 0;
01787 }

void ast_dsp_set_busy_compare ( struct ast_dsp dsp,
int  compare 
)

Set if silence and noice lengths must be compared for busy.

Definition at line 1706 of file dsp.c.

References ast_dsp::busycompare.

Referenced by dahdi_new().

01707 {
01708   if (compare > 0)
01709       dsp->busycompare = 1;
01710   else
01711       dsp->busycompare = 0;
01712 }

void ast_dsp_set_busy_count ( struct ast_dsp dsp,
int  cadences 
)

Set number of required cadences for busy.

Definition at line 1697 of file dsp.c.

References ast_dsp::busycount, and DSP_HISTORY.

Referenced by dahdi_new().

01698 {
01699    if (cadences < 4)
01700       cadences = 4;
01701    if (cadences > DSP_HISTORY)
01702       cadences = DSP_HISTORY;
01703    dsp->busycount = cadences;
01704 }

void ast_dsp_set_busy_pattern ( struct ast_dsp dsp,
int  tonelength,
int  quietlength,
int  fuzzy 
)

Set expected lengths of the busy tones.

Definition at line 1714 of file dsp.c.

References ast_log(), ast_dsp::busy_pattern_fuzzy, ast_dsp::busy_quietlength, ast_dsp::busy_tonelength, ast_dsp::busytoneonly, and LOG_DEBUG.

Referenced by dahdi_new().

01715 {
01716    dsp->busy_tonelength = tonelength;
01717    if (quietlength > 0)
01718       dsp->busy_quietlength = quietlength;
01719    else 
01720      dsp->busytoneonly = 1;
01721    ast_log(LOG_DEBUG, "dsp busy pattern set to %d,%d\n", tonelength, quietlength);
01722    if( fuzzy > 0 && fuzzy < 50 ) 
01723       dsp->busy_pattern_fuzzy = fuzzy;
01724 }

int ast_dsp_set_call_progress_zone ( struct ast_dsp dsp,
char *  zone 
)

Set zone for doing progress detection.

Definition at line 1807 of file dsp.c.

References aliases, ast_dsp_prog_reset(), name, and ast_dsp::progmode.

Referenced by dahdi_new().

01808 {
01809    int x;
01810    
01811    for (x=0;x<sizeof(aliases) / sizeof(aliases[0]);x++) {
01812       if (!strcasecmp(aliases[x].name, zone)) {
01813          dsp->progmode = aliases[x].mode;
01814          ast_dsp_prog_reset(dsp);
01815          return 0;
01816       }
01817    }
01818    return -1;
01819 }

void ast_dsp_set_features ( struct ast_dsp dsp,
int  features 
)

Select feature set.

Definition at line 1679 of file dsp.c.

References ast_dsp::features.

Referenced by __oh323_new(), dahdi_new(), disable_dtmf_detect(), enable_dtmf_detect(), mgcp_new(), misdn_set_opt_exec(), read_config(), sip_dtmfmode(), and sip_new().

01680 {
01681    dsp->features = features;
01682 }

void ast_dsp_set_threshold ( struct ast_dsp dsp,
int  threshold 
)

Set threshold value for silence.

Definition at line 1689 of file dsp.c.

References ast_dsp::threshold.

Referenced by __ast_play_and_record(), dahdi_new(), do_waiting(), handle_recordfile(), and isAnsweringMachine().

01690 {
01691    if (threshold < 256)
01692      dsp->threshold = 256;
01693    else
01694      dsp->threshold = threshold;
01695 }

int ast_dsp_silence ( struct ast_dsp dsp,
struct ast_frame f,
int *  totalsilence 
)

Return non-zero if this is silence. Updates "totalsilence" with the total number of seconds of silence.

Definition at line 1424 of file dsp.c.

References __ast_dsp_silence(), AST_FORMAT_SLINEAR, AST_FRAME_VOICE, ast_log(), f, len(), LOG_WARNING, and s.

Referenced by __ast_play_and_record(), background_detect_exec(), conf_run(), do_waiting(), handle_recordfile(), and isAnsweringMachine().

01425 {
01426    short *s;
01427    int len;
01428    
01429    if (f->frametype != AST_FRAME_VOICE) {
01430       ast_log(LOG_WARNING, "Can't calculate silence on a non-voice frame\n");
01431       return 0;
01432    }
01433    if (f->subclass != AST_FORMAT_SLINEAR) {
01434       ast_log(LOG_WARNING, "Can only calculate silence on signed-linear frames :(\n");
01435       return 0;
01436    }
01437    s = f->data;
01438    len = f->datalen/2;
01439    return __ast_dsp_silence(dsp, s, len, totalsilence);
01440 }


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