115 lines
2.4 KiB
C
115 lines
2.4 KiB
C
/*
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* iaxclient: a cross-platform IAX softphone library
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*
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* Copyrights:
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* Copyright (C) 2003-2006, Horizon Wimba, Inc.
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* Copyright (C) 2007, Wimba, Inc.
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*
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* Contributors:
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* Steve Kann <stevek@stevek.com>
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*
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* This program is free software, distributed under the terms of
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* the GNU Lesser (Library) General Public License.
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*/
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#include "codec_ilbc.h"
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#include "iaxclient_lib.h"
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#include "iLBC/iLBC_encode.h"
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#include "iLBC/iLBC_decode.h"
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static void destroy ( struct iaxc_audio_codec *c) {
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free(c->encstate);
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free(c->decstate);
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free(c);
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}
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static int decode ( struct iaxc_audio_codec *c,
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int *inlen, char *in, int *outlen, short *out ) {
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float fbuf[240];
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int i;
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if(*inlen == 0) {
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//fprintf(stderr, "ILBC Interpolate\n");
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iLBC_decode(fbuf, NULL, c->decstate, 0);
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for(i=0;i<240;i++)
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out[i] = fbuf[i];
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*outlen -= 240;
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return 0;
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}
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/* need to decode minimum of 33 bytes to 160 byte output */
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if( (*inlen < 50) || (*outlen < 240) ) {
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fprintf(stderr, "codec_ilbc: inlen = %d outlen= %d\n",*inlen,*outlen);
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return -1;
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}
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while( (*inlen >= 50) && (*outlen >= 240) ) {
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iLBC_decode(fbuf, in, c->decstate, 1);
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for(i=0;i<240;i++)
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out[i] = fbuf[i];
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out += 240;
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*outlen -= 240;
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in += 50;
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*inlen -= 50;
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}
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return 0;
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}
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static int encode ( struct iaxc_audio_codec *c,
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int *inlen, short *in, int *outlen, char *out ) {
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float fbuf[240];
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int i;
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while( (*inlen >= 240) && (*outlen >= 50) ) {
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for(i=0;i<240;i++)
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fbuf[i] = in[i];
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iLBC_encode(out,fbuf, c->encstate);
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out += 50;
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*outlen -= 50;
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in += 240;
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*inlen -= 240;
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}
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return 0;
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}
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struct iaxc_audio_codec *codec_audio_ilbc_new() {
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struct iaxc_audio_codec *c = calloc(sizeof(struct iaxc_audio_codec),1);
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if(!c) return c;
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strcpy(c->name,"iLBC");
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c->format = IAXC_FORMAT_ILBC;
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c->encode = encode;
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c->decode = decode;
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c->destroy = destroy;
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c->minimum_frame_size = 240;
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c->encstate = calloc(sizeof(iLBC_Enc_Inst_t),1);
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c->decstate = calloc(sizeof(iLBC_Dec_Inst_t),1);
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/* leaks a bit on no-memory */
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if(!(c->encstate && c->decstate))
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return NULL;
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/* the 30 parameters are used for the latest iLBC sources, in
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* http://www.ietf.org/internet-drafts/draft-ietf-avt-ilbc-codec-05.txt
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* as used in asterisk-CVS as of 14 Oct 2004 */
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initEncode(c->encstate, 30);
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initDecode(c->decstate, 30, 1); /* use enhancer */
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return c;
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}
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