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apps/app_amd.c: Fixed total time and silence calculations

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Between Asterisk 11 and Asterisk 13 there was a significant increase
in the number of AST_FRAME_NULL frames being processed by app_amd.c's
main loop. Each AST_FRAME_NULL frame was being counted as 100ms
towards the total time and silence. This may have been accurate
when app_amd.c was orginally added, but it is not in Asterisk 13.
As such the total analysis time and silence calculations were way
off effectively breaking app_amd.c

* Additional debug messages were added
* AST_FRAME_NULL are now ignored

ASTERISK-27610

Change-Id: I18aca01af98f87c1e168e6ae0d85c136d1df5ea9
This commit is contained in:
Michael Cargile
2018-02-23 22:24:10 -05:00
committed by Sean Bright
parent d6d520a040
commit 7b01236028
1 changed files with 17 additions and 4 deletions
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21
apps/app_amd.c
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@@ -277,6 +277,12 @@ static void isAnsweringMachine(struct ast_channel *chan, const char *data)
/* Now we go into a loop waiting for frames from the channel */
while ((res = ast_waitfor(chan, 2 * maxWaitTimeForFrame)) > -1) {
int ms = 0;
/* Figure out how long we waited */
if (res > 0) {
ms = 2 * maxWaitTimeForFrame - res;
}
/* If we fail to read in a frame, that means they hung up */
if (!(f = ast_read(chan))) {
@@ -287,15 +293,22 @@ static void isAnsweringMachine(struct ast_channel *chan, const char *data)
break;
}
if (f->frametype == AST_FRAME_VOICE || f->frametype == AST_FRAME_NULL || f->frametype == AST_FRAME_CNG) {
/* If the total time exceeds the analysis time then give up as we are not too sure */
if (f->frametype == AST_FRAME_VOICE || f->frametype == AST_FRAME_CNG) {
/* Figure out how long the frame is in milliseconds */
if (f->frametype == AST_FRAME_VOICE) {
framelength = (ast_codec_samples_count(f) / DEFAULT_SAMPLES_PER_MS);
} else {
framelength = 2 * maxWaitTimeForFrame;
framelength = ms;
}
iTotalTime += framelength;
ast_debug(1, "AMD: Channel [%s] frametype [%s] iTotalTime [%d] framelength [%d] totalAnalysisTime [%d]\n",
ast_channel_name(chan),
f->frametype == AST_FRAME_VOICE ? "AST_FRAME_VOICE" : "AST_FRAME_CNG",
iTotalTime, framelength, totalAnalysisTime);
/* If the total time exceeds the analysis time then give up as we are not too sure */
if (iTotalTime >= totalAnalysisTime) {
ast_verb(3, "AMD: Channel [%s]. Too long...\n", ast_channel_name(chan));
ast_frfree(f);
@@ -306,7 +319,7 @@ static void isAnsweringMachine(struct ast_channel *chan, const char *data)
/* Feed the frame of audio into the silence detector and see if we get a result */
if (f->frametype != AST_FRAME_VOICE)
dspsilence += 2 * maxWaitTimeForFrame;
dspsilence += framelength;
else {
dspsilence = 0;
ast_dsp_silence(silenceDetector, f, &dspsilence);