confidence scores are 0 best to 100 worst

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@8989 d0543943-73ff-0310-b7d9-9358b9ac24b2

diff --git a/src/mod/asr_tts/mod_pocketsphinx/mod_pocketsphinx.c b/src/mod/asr_tts/mod_pocketsphinx/mod_pocketsphinx.c
index 726e97f322914735709decc9ac409416879d622c..897806642cab63e9acbc1abdd3678f0d32a6bbe9 100644 (file)
--- a/src/mod/asr_tts/mod_pocketsphinx/mod_pocketsphinx.c
+++ b/src/mod/asr_tts/mod_pocketsphinx/mod_pocketsphinx.c
@@ -33,6 +33,7 @@
 #include <switch.h>
 #include <pocketsphinx.h>
 #include <err.h>
+#include <logmath.h>
 
 SWITCH_MODULE_LOAD_FUNCTION(mod_pocketsphinx_load);
 SWITCH_MODULE_SHUTDOWN_FUNCTION(mod_pocketsphinx_shutdown);
@@ -354,7 +355,7 @@ static switch_status_t pocketsphinx_asr_get_results(switch_asr_handle_t *ah, cha
 {
        pocketsphinx_t *ps = (pocketsphinx_t *) ah->private_info; 
        switch_status_t status = SWITCH_STATUS_SUCCESS;
-       int32_t score;
+       int32_t conf, lconf;
 
        if (switch_test_flag(ps, PSFLAG_BARGE)) {
                switch_clear_flag_locked(ps, PSFLAG_BARGE);
@@ -365,8 +366,13 @@ static switch_status_t pocketsphinx_asr_get_results(switch_asr_handle_t *ah, cha
                switch_mutex_lock(ps->flag_mutex); 
                switch_clear_flag(ps, PSFLAG_HAS_TEXT);
                
-               score = ps_get_prob(ps->ps, &ps->uttid);
-               ps->confidence = score - score - score / 1000;
+               conf = ps_get_prob(ps->ps, &ps->uttid);
+               lconf = logmath_log_to_ln(ps_get_logmath(ps->ps), conf);
+               ps->confidence = lconf - lconf - lconf;
+               /* 0(confident) to 100(not confident) score */ 
+               if (ps->confidence > 100) {
+                       ps->confidence = 100;
+               }
 
                switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Recognized: %s, Score: %d\n", ps->hyp, ps->confidence);
                switch_mutex_unlock(ps->flag_mutex);