kenmirrors/asterisk
1
0
Fork 0
mirror of https://github.com/asterisk/asterisk.git synced 2025-09-02 19:16:15 +00:00
Code Issues Packages Projects Releases Wiki Activity

Version 0.1.7 from FTP

Browse Source 
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@239 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Mark Spencer
2001-03-13 04:46:10 +00:00
parent 61de43ea32
commit 1faca4015c
1 changed files with 55 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

86
codecs/codec_lpc10.c
View File

@@ -55,7 +55,7 @@ struct ast_translator_pvt {
/* Space to build offset */
char offset[AST_FRIENDLY_OFFSET];
/* Buffer for our outgoing frame */
short outbuf[LPC10_SAMPLES_PER_FRAME];
short outbuf[8000];
/* Enough to store a full second */
short buf[8000];
int tail;
@@ -197,26 +197,32 @@ static int lpc10tolin_framein(struct ast_translator_pvt *tmp, struct ast_frame *
/* Assuming there's space left, decode into the current buffer at
the tail location */
int x;
int len=0;
float tmpbuf[LPC10_SAMPLES_PER_FRAME];
short *sd;
INT32 bits[LPC10_BITS_IN_COMPRESSED_FRAME];
if (tmp->tail + LPC10_SAMPLES_PER_FRAME < sizeof(tmp->buf)/2) {
sd = tmp->buf + tmp->tail;
extract_bits(bits, f->data);
if (lpc10_decode(bits, tmpbuf, tmp->lpc10.dec)) {
ast_log(LOG_WARNING, "Invalid lpc10 data\n");
while(len + LPC10_BYTES_IN_COMPRESSED_FRAME <= f->datalen) {
if (tmp->tail + LPC10_SAMPLES_PER_FRAME < sizeof(tmp->buf)/2) {
sd = tmp->buf + tmp->tail;
extract_bits(bits, f->data + len);
if (lpc10_decode(bits, tmpbuf, tmp->lpc10.dec)) {
ast_log(LOG_WARNING, "Invalid lpc10 data\n");
return -1;
}
for (x=0;x<LPC10_SAMPLES_PER_FRAME;x++) {
/* Convert to a real between -1.0 and 1.0 */
sd[x] = 32768.0 * tmpbuf[x];
}
tmp->tail+=LPC10_SAMPLES_PER_FRAME;
} else {
ast_log(LOG_WARNING, "Out of buffer space\n");
return -1;
}
for (x=0;x<LPC10_SAMPLES_PER_FRAME;x++) {
/* Convert to a real between -1.0 and 1.0 */
sd[x] = 32768.0 * tmpbuf[x];
}
tmp->tail+=LPC10_SAMPLES_PER_FRAME;
} else {
ast_log(LOG_WARNING, "Out of buffer space\n");
return -1;
len += LPC10_BYTES_IN_COMPRESSED_FRAME;
}
if (len != f->datalen)
printf("Decoded %d, expected %d\n", len, f->datalen);
return 0;
}
@@ -239,35 +245,48 @@ static int lintolpc10_framein(struct ast_translator_pvt *tmp, struct ast_frame *
static struct ast_frame *lintolpc10_frameout(struct ast_translator_pvt *tmp)
{
int x;
int consumed = 0;
float tmpbuf[LPC10_SAMPLES_PER_FRAME];
INT32 bits[LPC10_BITS_IN_COMPRESSED_FRAME];
/* We can't work on anything less than a frame in size */
if (tmp->tail < LPC10_SAMPLES_PER_FRAME)
return NULL;
/* Encode a frame of data */
for (x=0;x<LPC10_SAMPLES_PER_FRAME;x++) {
tmpbuf[x] = (float)tmp->buf[x] / 32768.0;
}
lpc10_encode(tmpbuf, bits, tmp->lpc10.enc);
build_bits((unsigned char *)tmp->outbuf, bits);
/* Start with an empty frame */
tmp->f.timelen = 0;
tmp->f.datalen = 0;
tmp->f.frametype = AST_FRAME_VOICE;
tmp->f.subclass = AST_FORMAT_LPC10;
tmp->f.datalen = LPC10_BYTES_IN_COMPRESSED_FRAME;
tmp->f.timelen = 22;
/* We alternate between 22 and 23 ms to simulate 22.5 ms */
tmp->f.timelen += tmp->longer;
/* Use one of the two left over bits to record if this is a 22 or 23 ms frame...
important for IAX use */
tmp->longer = 1 - tmp->longer;
while(tmp->tail >= LPC10_SAMPLES_PER_FRAME) {
if (tmp->f.datalen + LPC10_BYTES_IN_COMPRESSED_FRAME > sizeof(tmp->outbuf)) {
ast_log(LOG_WARNING, "Out of buffer space\n");
return NULL;
}
/* Encode a frame of data */
for (x=0;x<LPC10_SAMPLES_PER_FRAME;x++) {
tmpbuf[x] = (float)tmp->buf[x+consumed] / 32768.0;
}
lpc10_encode(tmpbuf, bits, tmp->lpc10.enc);
build_bits(((unsigned char *)tmp->outbuf) + tmp->f.datalen, bits);
tmp->f.datalen += LPC10_BYTES_IN_COMPRESSED_FRAME;
tmp->f.timelen += 22;
/* We alternate between 22 and 23 ms to simulate 22.5 ms */
tmp->f.timelen += tmp->longer;
/* Use one of the two left over bits to record if this is a 22 or 23 ms frame...
important for IAX use */
tmp->longer = 1 - tmp->longer;
#if 0 /* what the heck was this for? */
((char *)(tmp->f.data))[consumed - 1] |= tmp->longer;
#endif
tmp->tail -= LPC10_SAMPLES_PER_FRAME;
consumed += LPC10_SAMPLES_PER_FRAME;
}
tmp->f.mallocd = 0;
tmp->f.offset = AST_FRIENDLY_OFFSET;
tmp->f.src = __PRETTY_FUNCTION__;
tmp->f.data = tmp->outbuf;
((char *)(tmp->f.data))[LPC10_BYTES_IN_COMPRESSED_FRAME - 1] |= tmp->longer;
tmp->tail -= LPC10_SAMPLES_PER_FRAME;
/* Move the data at the end of the buffer to the front */
if (tmp->tail)
memmove(tmp->buf, tmp->buf + LPC10_SAMPLES_PER_FRAME, tmp->tail * 2);
memmove(tmp->buf, tmp->buf + consumed, tmp->tail * 2);
#if 0
/* Save a sample frame */
{ static int samplefr = 0;
@@ -346,3 +365,8 @@ int usecount(void)
STANDARD_USECOUNT(res);
return res;
}
char *key()
{
return ASTERISK_GPL_KEY;
}