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support DTX and CNG in speex (bug #4608) 

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@6113 f38db490-d61c-443f-a65b-d21fe96a405b
This commit is contained in:
kpfleming 2005-07-12 22:20:16 +00:00
parent 4e3e4a83f2
commit 20933df538
2 changed files with 21 additions and 4 deletions
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23
codecs/codec_speex.c
View File

@ -69,6 +69,7 @@ struct ast_translator_pvt {
/* Enough to store a full second */
short buf[8000];
int tail;
int silent_state;
};
#define speex_coder_pvt ast_translator_pvt
@ -91,8 +92,6 @@ static struct ast_translator_pvt *lintospeex_new(void)
speex_encoder_ctl(tmp->speex, SPEEX_SET_QUALITY, &quality);
if (vad)
speex_encoder_ctl(tmp->speex, SPEEX_SET_VAD, &vad);
if (dtx)
speex_encoder_ctl(tmp->speex, SPEEX_SET_DTX, &dtx);
}
if (vbr) {
speex_encoder_ctl(tmp->speex, SPEEX_SET_VBR, &vbr);
@ -101,7 +100,10 @@ static struct ast_translator_pvt *lintospeex_new(void)
if (abr) {
speex_encoder_ctl(tmp->speex, SPEEX_SET_ABR, &abr);
}
if (dtx)
speex_encoder_ctl(tmp->speex, SPEEX_SET_DTX, &dtx);
tmp->tail = 0;
tmp->silent_state = 0;
}
localusecnt++;
}
@ -241,6 +243,7 @@ static struct ast_frame *lintospeex_frameout(struct ast_translator_pvt *tmp)
float fbuf[1024];
int len;
int y=0,x;
int is_speech=1;
/* We can't work on anything less than a frame in size */
if (tmp->tail < tmp->framesize)
return NULL;
@ -256,7 +259,7 @@ static struct ast_frame *lintospeex_frameout(struct ast_translator_pvt *tmp)
for (x=0;x<tmp->framesize;x++)
fbuf[x] = tmp->buf[x];
/* Encode a frame of data */
speex_encode(tmp->speex, fbuf, &tmp->bits);
is_speech = speex_encode(tmp->speex, fbuf, &tmp->bits) || !dtx;
/* Assume 8000 Hz -- 20 ms */
tmp->tail -= tmp->framesize;
/* Move the data at the end of the buffer to the front */
@ -264,6 +267,20 @@ static struct ast_frame *lintospeex_frameout(struct ast_translator_pvt *tmp)
memmove(tmp->buf, tmp->buf + tmp->framesize, tmp->tail * 2);
y++;
}
/* Use AST_FRAME_CNG to signify the start of any silence period */
if(!is_speech) {
if(tmp->silent_state) {
return NULL;
} else {
tmp->silent_state = 1;
speex_bits_reset(&tmp->bits);
tmp->f.frametype = AST_FRAME_CNG;
}
} else {
tmp->silent_state = 0;
}
/* Terminate bit stream */
speex_bits_pack(&tmp->bits, 15, 5);
len = speex_bits_write(&tmp->bits, (char *)tmp->outbuf, sizeof(tmp->outbuf));

2
frame.c
View File

@ -1117,7 +1117,7 @@ static int speex_get_wb_sz_at(unsigned char *data, int len, int bit)
static int speex_samples(unsigned char *data, int len)
{
static int SpeexSubModeSz[] = {
0, 43, 119, 160,
5, 43, 119, 160,
220, 300, 364, 492,
79, 0, 0, 0,
0, 0, 0, 0 };