Fri Aug 13 18:21:23 2010

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 1283 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().

01284 {
01285    int res = 0, x;
01286    int avgsilence = 0, hitsilence = 0;
01287    int avgtone = 0, hittone = 0;
01288 #ifdef DEBUG_DSP_BUSYDETECT
01289    char buf[16];
01290    char silence_list[64]="", tone_list[64]="";
01291 #endif
01292    
01293    if (!dsp->busymaybe)
01294       return res;
01295    dsp->busymaybe = 0;
01296 
01297    for (x=DSP_HISTORY - dsp->busycount;x<DSP_HISTORY;x++) {
01298       avgsilence += dsp->historicsilence[x];
01299       avgtone += dsp->historicnoise[x];
01300    }
01301    avgsilence /= dsp->busycount;
01302    avgtone /= dsp->busycount;
01303 #ifdef DEBUG_DSP_BUSYDETECT
01304    sprintf(silence_list,"Silences: ");
01305    sprintf(tone_list,"Tones:    ");
01306 #endif
01307    for (x=DSP_HISTORY - dsp->busycount; x<DSP_HISTORY; x++) {
01308 #ifdef DEBUG_DSP_BUSYDETECT
01309       snprintf(buf, sizeof(buf), "%5d ", dsp->historicsilence[x]);
01310       strcat(silence_list, buf);
01311       snprintf(buf, sizeof(buf), "%5d ", dsp->historicnoise[x]);
01312       strcat(tone_list, buf); 
01313 #endif
01314       if (!dsp->busytoneonly) {
01315          if (avgsilence > dsp->historicsilence[x]) {
01316             if (avgsilence - (avgsilence*BUSY_PERCENT/100) <= dsp->historicsilence[x])
01317                hitsilence++;
01318          } else {
01319             if (avgsilence + (avgsilence*BUSY_PERCENT/100) >= dsp->historicsilence[x])
01320                hitsilence++;
01321          }
01322       }
01323       if (avgtone > dsp->historicnoise[x]) {
01324          if (avgtone - (avgtone*BUSY_PERCENT/100) <= dsp->historicnoise[x])
01325             hittone++;
01326       } else {
01327          if (avgtone + (avgtone*BUSY_PERCENT/100) >= dsp->historicnoise[x])
01328             hittone++;
01329       }
01330    }
01331 #ifdef DEBUG_DSP_BUSYDETECT
01332    fprintf(stderr, "BUSY DETECTOR\n");   
01333    fprintf(stderr, "%s\n", tone_list);
01334    fprintf(stderr, "%s\n", silence_list)
01335 #endif
01336    if ((dsp->busytoneonly || 
01337        (hitsilence >= dsp->busycount - 1 && avgsilence >= BUSY_MIN && avgsilence <= BUSY_MAX)) &&
01338       (hittone >= dsp->busycount - 1 && avgtone >= BUSY_MIN && avgtone <= BUSY_MAX)) {
01339       if (dsp->busycompare) {
01340            if (dsp->busytoneonly) {
01341              res = 1;
01342             ast_log(LOG_ERROR, "You can't use busytoneonly together with busycompare");
01343          } else {
01344               if (avgtone > avgsilence) {
01345                  if (avgtone - avgtone*BUSY_PERCENT/100 <= avgsilence)
01346                     res = 1;
01347             } else {
01348                  if (avgtone + avgtone*BUSY_PERCENT/100 >= avgsilence)
01349                    res = 1;
01350             }
01351          }
01352       } else {
01353          res = 1;
01354       }
01355    }
01356    /* If we know the expected busy tone length, check we are in the range */
01357    if (res && (dsp->busy_tonelength > 0)) {
01358       if (abs(avgtone - dsp->busy_tonelength) > (dsp->busy_tonelength*dsp->busy_pattern_fuzzy/100)) {
01359          if(option_debug) {
01360             ast_log(LOG_DEBUG, "busy detector: avgtone of %d not close enough to desired %d\n", avgtone, dsp->busy_tonelength);
01361          }
01362          res = 0;
01363       }
01364    }
01365    /* If we know the expected busy tone silent-period length, check we are in the range */
01366    if (res && (!dsp->busytoneonly) && (dsp->busy_quietlength > 0)) {
01367       if (abs(avgsilence - dsp->busy_quietlength) > (dsp->busy_quietlength*dsp->busy_pattern_fuzzy/100)) {
01368          if(option_debug) {
01369             ast_log(LOG_DEBUG, "busy detector: avgsilence of %d not close enough to desired %d\n", avgsilence, dsp->busy_quietlength);
01370          }
01371          res = 0;
01372       }
01373    }
01374    if (res && option_debug)
01375       ast_log(LOG_NOTICE, "Detected busy sequence, avgtone: %d, avgsilence %d\n", avgtone, avgsilence);
01376    return res;
01377 }

int ast_dsp_call_progress ( struct ast_dsp dsp,
struct ast_frame inf 
)

Scans for progress indication in audio.

Definition at line 1212 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.

01213 {
01214    if (inf->frametype != AST_FRAME_VOICE) {
01215       ast_log(LOG_WARNING, "Can't check call progress of non-voice frames\n");
01216       return 0;
01217    }
01218    if (inf->subclass != AST_FORMAT_SLINEAR) {
01219       ast_log(LOG_WARNING, "Can only check call progress in signed-linear frames\n");
01220       return 0;
01221    }
01222    return __ast_dsp_call_progress(dsp, inf->data, inf->datalen / 2);
01223 }

int ast_dsp_digitdetect ( struct ast_dsp dsp,
struct ast_frame f 
)

Return non-zero if DTMF hit was found.

Definition at line 1011 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.

01012 {
01013    short *s;
01014    int len;
01015    int ign=0;
01016 
01017    if (inf->frametype != AST_FRAME_VOICE) {
01018       ast_log(LOG_WARNING, "Can't check call progress of non-voice frames\n");
01019       return 0;
01020    }
01021    if (inf->subclass != AST_FORMAT_SLINEAR) {
01022       ast_log(LOG_WARNING, "Can only check call progress in signed-linear frames\n");
01023       return 0;
01024    }
01025    s = inf->data;
01026    len = inf->datalen / 2;
01027    return __ast_dsp_digitdetect(dsp, s, len, &ign);
01028 }

int ast_dsp_digitmode ( struct ast_dsp dsp,
int  digitmode 
)

Set digit mode.

Definition at line 1794 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().

01795 {
01796    int new;
01797    int old;
01798    
01799    old = dsp->digitmode & (DSP_DIGITMODE_DTMF | DSP_DIGITMODE_MF | DSP_DIGITMODE_MUTECONF | DSP_DIGITMODE_MUTEMAX);
01800    new = digitmode & (DSP_DIGITMODE_DTMF | DSP_DIGITMODE_MF | DSP_DIGITMODE_MUTECONF | DSP_DIGITMODE_MUTEMAX);
01801    if (old != new) {
01802       /* Must initialize structures if switching from MF to DTMF or vice-versa */
01803       if (new & DSP_DIGITMODE_MF)
01804          ast_mf_detect_init(&dsp->td.mf);
01805       else
01806          ast_dtmf_detect_init(&dsp->td.dtmf);
01807    }
01808    dsp->digitmode = digitmode;
01809    return 0;
01810 }

void ast_dsp_digitreset ( struct ast_dsp dsp  ) 

Reset DTMF detector.

Definition at line 1731 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().

01732 {
01733    int i;
01734    
01735    dsp->thinkdigit = 0;
01736    if (dsp->digitmode & DSP_DIGITMODE_MF) {
01737       memset(dsp->td.mf.digits, 0, sizeof(dsp->td.mf.digits));
01738       dsp->td.mf.current_digits = 0;
01739       /* Reinitialise the detector for the next block */
01740       for (i = 0;  i < 6;  i++) {
01741          goertzel_reset(&dsp->td.mf.tone_out[i]);
01742 #ifdef OLD_DSP_ROUTINES
01743          goertzel_reset(&dsp->td.mf.tone_out2nd[i]);
01744 #endif         
01745       }
01746 #ifdef OLD_DSP_ROUTINES
01747       dsp->td.mf.energy = 0.0;
01748       dsp->td.mf.hit1 = dsp->td.mf.hit2 = dsp->td.mf.hit3 = dsp->td.mf.hit4 = dsp->td.mf.mhit = 0;
01749 #else
01750       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;
01751 #endif      
01752       dsp->td.mf.current_sample = 0;
01753    } else {
01754       memset(dsp->td.dtmf.digits, 0, sizeof(dsp->td.dtmf.digits));
01755       dsp->td.dtmf.current_digits = 0;
01756       /* Reinitialise the detector for the next block */
01757       for (i = 0;  i < 4;  i++) {
01758          goertzel_reset(&dsp->td.dtmf.row_out[i]);
01759          goertzel_reset(&dsp->td.dtmf.col_out[i]);
01760 #ifdef OLD_DSP_ROUTINES
01761          goertzel_reset(&dsp->td.dtmf.row_out2nd[i]);
01762          goertzel_reset(&dsp->td.dtmf.col_out2nd[i]);
01763 #endif         
01764       }
01765 #ifdef FAX_DETECT
01766       goertzel_reset (&dsp->td.dtmf.fax_tone);
01767 #endif
01768 #ifdef OLD_DSP_ROUTINES
01769 #ifdef FAX_DETECT
01770       goertzel_reset (&dsp->td.dtmf.fax_tone2nd);
01771 #endif
01772       dsp->td.dtmf.hit1 = dsp->td.dtmf.hit2 = dsp->td.dtmf.hit3 = dsp->td.dtmf.hit4 = dsp->td.dtmf.mhit = 0;
01773 #else
01774       dsp->td.dtmf.lasthit = dsp->td.dtmf.mhit = 0;
01775 #endif      
01776       dsp->td.dtmf.energy = 0.0;
01777       dsp->td.dtmf.current_sample = 0;
01778    }
01779 }

void ast_dsp_free ( struct ast_dsp dsp  ) 

Definition at line 1689 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().

01690 {
01691    free(dsp);
01692 }

int ast_dsp_get_tcount ( struct ast_dsp dsp  ) 

Get tcount (Threshold counter).

Definition at line 1831 of file dsp.c.

References ast_dsp::tcount.

01832 {
01833    return dsp->tcount;
01834 }

int ast_dsp_get_tstate ( struct ast_dsp dsp  ) 

Get tstate (Tone State).

Definition at line 1826 of file dsp.c.

References ast_dsp::tstate.

01827 {
01828    return dsp->tstate;
01829 }

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

Get pending DTMF/MF digits.

Definition at line 1050 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.

01051 {
01052    if (dsp->digitmode & DSP_DIGITMODE_MF) {
01053       if (max > dsp->td.mf.current_digits)
01054          max = dsp->td.mf.current_digits;
01055       if (max > 0) {
01056          memcpy(buf, dsp->td.mf.digits, max);
01057          memmove(dsp->td.mf.digits, dsp->td.mf.digits + max, dsp->td.mf.current_digits - max);
01058          dsp->td.mf.current_digits -= max;
01059       }
01060       buf[max] = '\0';
01061       return  max;
01062    } else {
01063       if (max > dsp->td.dtmf.current_digits)
01064          max = dsp->td.dtmf.current_digits;
01065       if (max > 0) {
01066          memcpy (buf, dsp->td.dtmf.digits, max);
01067          memmove (dsp->td.dtmf.digits, dsp->td.dtmf.digits + max, dsp->td.dtmf.current_digits - max);
01068          dsp->td.dtmf.current_digits -= max;
01069       }
01070       buf[max] = '\0';
01071       return  max;
01072    }
01073 }

struct ast_dsp* ast_dsp_new ( void   ) 

Definition at line 1653 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().

01654 {
01655    struct ast_dsp *dsp;
01656    
01657    if ((dsp = ast_calloc(1, sizeof(*dsp)))) {      
01658       dsp->threshold = DEFAULT_THRESHOLD;
01659       dsp->features = DSP_FEATURE_SILENCE_SUPPRESS;
01660       dsp->busycount = DSP_HISTORY;
01661       dsp->busy_pattern_fuzzy = BUSY_PAT_PERCENT;
01662 #ifdef BUSYDETECT_TONEONLY
01663       dsp->busytoneonly = 1;
01664 #ifdef BUSYDETECT_COMPARE_TONE_AND_SILENCE
01665 #error "You can't use BUSYDETECT_TONEONLY together with BUSYDETECT_COMPARE_TONE_AND_SILENCE");
01666 #endif
01667 #else
01668       dsp->busytoneonly = 0;
01669 #ifdef BUSYDETECT_COMPARE_TONE_AND_SILENCE
01670       dsp->busycompare = 1;
01671 #else
01672       dsp->busycompare = 0;
01673 #endif
01674 #endif
01675       dsp->display_inband_dtmf_warning = 1;
01676       /* Initialize DTMF detector */
01677       ast_dtmf_detect_init(&dsp->td.dtmf);
01678       /* Initialize initial DSP progress detect parameters */
01679       ast_dsp_prog_reset(dsp);
01680    }
01681    return dsp;
01682 }

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 1443 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, ast_dsp::display_inband_dtmf_warning, 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 mgcp_rtp_read(), oh323_rtp_read(), process_ast_dsp(), and sip_rtp_read().

01444 {
01445    int silence;
01446    int res;
01447    int digit;
01448    int x;
01449    short *shortdata;
01450    unsigned char *odata;
01451    int len;
01452    int writeback = 0;
01453 
01454 #define FIX_INF(inf) do { \
01455       if (writeback) { \
01456          switch(inf->subclass) { \
01457          case AST_FORMAT_SLINEAR: \
01458             break; \
01459          case AST_FORMAT_ULAW: \
01460             for (x=0;x<len;x++) \
01461                odata[x] = AST_LIN2MU((unsigned short)shortdata[x]); \
01462             break; \
01463          case AST_FORMAT_ALAW: \
01464             for (x=0;x<len;x++) \
01465                odata[x] = AST_LIN2A((unsigned short)shortdata[x]); \
01466             break; \
01467          } \
01468       } \
01469    } while(0) 
01470 
01471    if (!af)
01472       return NULL;
01473    if (af->frametype != AST_FRAME_VOICE)
01474       return af;
01475    odata = af->data;
01476    len = af->datalen;
01477    /* Make sure we have short data */
01478    switch(af->subclass) {
01479    case AST_FORMAT_SLINEAR:
01480       shortdata = af->data;
01481       len = af->datalen / 2;
01482       break;
01483    case AST_FORMAT_ULAW:
01484       shortdata = alloca(af->datalen * 2);
01485       for (x = 0;x < len; x++) 
01486          shortdata[x] = AST_MULAW(odata[x]);
01487       break;
01488    case AST_FORMAT_ALAW:
01489       shortdata = alloca(af->datalen * 2);
01490       for (x = 0; x < len; x++) 
01491          shortdata[x] = AST_ALAW(odata[x]);
01492       break;
01493    default:
01494       /*Display warning only once. Otherwise you would get hundreds of warnings every second */
01495       if (dsp->display_inband_dtmf_warning)
01496          ast_log(LOG_WARNING, "Inband DTMF is not supported on codec %s. Use RFC2833\n", ast_getformatname(af->subclass));
01497       dsp->display_inband_dtmf_warning = 0;
01498       return af;
01499    }
01500    silence = __ast_dsp_silence(dsp, shortdata, len, NULL);
01501    if ((dsp->features & DSP_FEATURE_SILENCE_SUPPRESS) && silence) {
01502       memset(&dsp->f, 0, sizeof(dsp->f));
01503       dsp->f.frametype = AST_FRAME_NULL;
01504       ast_frfree(af);
01505       return ast_frisolate(&dsp->f);
01506    }
01507    if ((dsp->features & DSP_FEATURE_BUSY_DETECT) && ast_dsp_busydetect(dsp)) {
01508       chan->_softhangup |= AST_SOFTHANGUP_DEV;
01509       memset(&dsp->f, 0, sizeof(dsp->f));
01510       dsp->f.frametype = AST_FRAME_CONTROL;
01511       dsp->f.subclass = AST_CONTROL_BUSY;
01512       ast_frfree(af);
01513       return ast_frisolate(&dsp->f);
01514    }
01515    if ((dsp->features & DSP_FEATURE_DTMF_DETECT)) {
01516       digit = __ast_dsp_digitdetect(dsp, shortdata, len, &writeback);
01517 #if 0
01518       if (digit)
01519          printf("Performing digit detection returned %d, digitmode is %d\n", digit, dsp->digitmode);
01520 #endif         
01521       if (dsp->digitmode & (DSP_DIGITMODE_MUTECONF | DSP_DIGITMODE_MUTEMAX)) {
01522          if (!dsp->thinkdigit) {
01523             if (digit) {
01524                /* Looks like we might have something.  
01525                 * Request a conference mute for the moment */
01526                memset(&dsp->f, 0, sizeof(dsp->f));
01527                dsp->f.frametype = AST_FRAME_DTMF;
01528                dsp->f.subclass = 'm';
01529                dsp->thinkdigit = 'x';
01530                FIX_INF(af);
01531                if (chan)
01532                   ast_queue_frame(chan, af);
01533                ast_frfree(af);
01534                return ast_frisolate(&dsp->f);
01535             }
01536          } else {
01537             if (digit) {
01538                /* Thought we saw one last time.  Pretty sure we really have now */
01539                if ((dsp->thinkdigit != 'x') && (dsp->thinkdigit != digit)) {
01540                   /* If we found a digit, and we're changing digits, go
01541                      ahead and send this one, but DON'T stop confmute because
01542                      we're detecting something else, too... */
01543                   memset(&dsp->f, 0, sizeof(dsp->f));
01544                   dsp->f.frametype = AST_FRAME_DTMF_END;
01545                   dsp->f.subclass = dsp->thinkdigit;
01546                   FIX_INF(af);
01547                   if (chan)
01548                      ast_queue_frame(chan, af);
01549                   ast_frfree(af);
01550                } else {
01551                   dsp->thinkdigit = digit;
01552                   memset(&dsp->f, 0, sizeof(dsp->f));
01553                   dsp->f.frametype = AST_FRAME_DTMF_BEGIN;
01554                   dsp->f.subclass = dsp->thinkdigit;
01555                   FIX_INF(af);
01556                   if (chan)
01557                      ast_queue_frame(chan, af);
01558                   ast_frfree(af);
01559                }
01560                return ast_frisolate(&dsp->f);
01561             } else {
01562                memset(&dsp->f, 0, sizeof(dsp->f));
01563                if (dsp->thinkdigit != 'x') {
01564                   /* If we found a digit, send it now */
01565                   dsp->f.frametype = AST_FRAME_DTMF_END;
01566                   dsp->f.subclass = dsp->thinkdigit;
01567                   dsp->thinkdigit = 0;
01568                } else {
01569                   dsp->f.frametype = AST_FRAME_DTMF;
01570                   dsp->f.subclass = 'u';
01571                   dsp->thinkdigit = 0;
01572                }
01573                FIX_INF(af);
01574                if (chan)
01575                   ast_queue_frame(chan, af);
01576                ast_frfree(af);
01577                return ast_frisolate(&dsp->f);
01578             }
01579          }
01580       } else if (!digit) {
01581          /* Only check when there is *not* a hit... */
01582          if (dsp->digitmode & DSP_DIGITMODE_MF) {
01583             if (dsp->td.mf.current_digits) {
01584                memset(&dsp->f, 0, sizeof(dsp->f));
01585                dsp->f.frametype = AST_FRAME_DTMF;
01586                dsp->f.subclass = dsp->td.mf.digits[0];
01587                memmove(dsp->td.mf.digits, dsp->td.mf.digits + 1, dsp->td.mf.current_digits);
01588                dsp->td.mf.current_digits--;
01589                FIX_INF(af);
01590                if (chan)
01591                   ast_queue_frame(chan, af);
01592                ast_frfree(af);
01593                return ast_frisolate(&dsp->f);
01594             }
01595          } else {
01596             if (dsp->td.dtmf.current_digits) {
01597                memset(&dsp->f, 0, sizeof(dsp->f));
01598                dsp->f.frametype = AST_FRAME_DTMF_END;
01599                dsp->f.subclass = dsp->td.dtmf.digits[0];
01600                memmove(dsp->td.dtmf.digits, dsp->td.dtmf.digits + 1, dsp->td.dtmf.current_digits);
01601                dsp->td.dtmf.current_digits--;
01602                FIX_INF(af);
01603                if (chan)
01604                   ast_queue_frame(chan, af);
01605                ast_frfree(af);
01606                return ast_frisolate(&dsp->f);
01607             }
01608          }
01609       }
01610    }
01611    if ((dsp->features & DSP_FEATURE_CALL_PROGRESS)) {
01612       res = __ast_dsp_call_progress(dsp, shortdata, len);
01613       if (res) {
01614          switch(res) {
01615          case AST_CONTROL_ANSWER:
01616          case AST_CONTROL_BUSY:
01617          case AST_CONTROL_RINGING:
01618          case AST_CONTROL_CONGESTION:
01619          case AST_CONTROL_HANGUP:
01620             memset(&dsp->f, 0, sizeof(dsp->f));
01621             dsp->f.frametype = AST_FRAME_CONTROL;
01622             dsp->f.subclass = res;
01623             dsp->f.src = "dsp_progress";
01624             if (chan) 
01625                ast_queue_frame(chan, &dsp->f);
01626             break;
01627          default:
01628             ast_log(LOG_WARNING, "Don't know how to represent call progress message %d\n", res);
01629          }
01630       }
01631    }
01632    FIX_INF(af);
01633    return af;
01634 }

void ast_dsp_reset ( struct ast_dsp dsp  ) 

Reset total silence count.

Definition at line 1781 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.

01782 {
01783    int x;
01784    
01785    dsp->totalsilence = 0;
01786    dsp->gsamps = 0;
01787    for (x=0;x<4;x++)
01788       dsp->freqs[x].v2 = dsp->freqs[x].v3 = 0.0;
01789    memset(dsp->historicsilence, 0, sizeof(dsp->historicsilence));
01790    memset(dsp->historicnoise, 0, sizeof(dsp->historicnoise));  
01791    dsp->ringtimeout= 0;
01792 }

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 1711 of file dsp.c.

References ast_dsp::busycompare.

Referenced by dahdi_new().

01712 {
01713   if (compare > 0)
01714       dsp->busycompare = 1;
01715   else
01716       dsp->busycompare = 0;
01717 }

void ast_dsp_set_busy_count ( struct ast_dsp dsp,
int  cadences 
)

Set number of required cadences for busy.

Definition at line 1702 of file dsp.c.

References ast_dsp::busycount, and DSP_HISTORY.

Referenced by dahdi_new().

01703 {
01704    if (cadences < 4)
01705       cadences = 4;
01706    if (cadences > DSP_HISTORY)
01707       cadences = DSP_HISTORY;
01708    dsp->busycount = cadences;
01709 }

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 1719 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().

01720 {
01721    dsp->busy_tonelength = tonelength;
01722    if (quietlength > 0)
01723       dsp->busy_quietlength = quietlength;
01724    else 
01725      dsp->busytoneonly = 1;
01726    ast_log(LOG_DEBUG, "dsp busy pattern set to %d,%d\n", tonelength, quietlength);
01727    if( fuzzy > 0 && fuzzy < 50 ) 
01728       dsp->busy_pattern_fuzzy = fuzzy;
01729 }

int ast_dsp_set_call_progress_zone ( struct ast_dsp dsp,
char *  zone 
)

Set zone for doing progress detection.

Definition at line 1812 of file dsp.c.

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

Referenced by dahdi_new().

01813 {
01814    int x;
01815    
01816    for (x=0;x<sizeof(aliases) / sizeof(aliases[0]);x++) {
01817       if (!strcasecmp(aliases[x].name, zone)) {
01818          dsp->progmode = aliases[x].mode;
01819          ast_dsp_prog_reset(dsp);
01820          return 0;
01821       }
01822    }
01823    return -1;
01824 }

void ast_dsp_set_features ( struct ast_dsp dsp,
int  features 
)

Select feature set.

Definition at line 1684 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().

01685 {
01686    dsp->features = features;
01687 }

void ast_dsp_set_threshold ( struct ast_dsp dsp,
int  threshold 
)

Set threshold value for silence.

Definition at line 1694 of file dsp.c.

References ast_dsp::threshold.

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

01695 {
01696    if (threshold < 256)
01697      dsp->threshold = 256;
01698    else
01699      dsp->threshold = threshold;
01700 }

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 1425 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().

01426 {
01427    short *s;
01428    int len;
01429    
01430    if (f->frametype != AST_FRAME_VOICE) {
01431       ast_log(LOG_WARNING, "Can't calculate silence on a non-voice frame\n");
01432       return 0;
01433    }
01434    if (f->subclass != AST_FORMAT_SLINEAR) {
01435       ast_log(LOG_WARNING, "Can only calculate silence on signed-linear frames :(\n");
01436       return 0;
01437    }
01438    s = f->data;
01439    len = f->datalen/2;
01440    return __ast_dsp_silence(dsp, s, len, totalsilence);
01441 }


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