first commit

2022-10-20 20:29:11 +08:00
commit 4d531f8044
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+/*
+ * iaxclient: a cross-platform IAX softphone library
+ *
+ * Copyrights:
+ * Copyright (C) 2003-2006, Horizon Wimba, Inc.
+ * Copyright (C) 2007, Wimba, Inc.
+ *
+ * Contributors:
+ * Steve Kann <stevek@stevek.com>
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU Lesser (Library) General Public License.
+ */
+
+#include "codec_ilbc.h"
+#include "iaxclient_lib.h"
+#include "iLBC/iLBC_encode.h"
+#include "iLBC/iLBC_decode.h"
+
+
+static void destroy ( struct iaxc_audio_codec *c) {
+    free(c->encstate);
+    free(c->decstate);
+    free(c);
+}
+
+
+static int decode ( struct iaxc_audio_codec *c,
+    int *inlen, char *in, int *outlen, short *out ) {
+
+    float fbuf[240];
+    int i;
+
+    if(*inlen == 0) {
+        //fprintf(stderr, "ILBC Interpolate\n");
+	iLBC_decode(fbuf, NULL, c->decstate, 0);
+	for(i=0;i<240;i++)
+	    out[i] = fbuf[i];
+        *outlen -= 240;
+        return 0;
+    }
+
+
+    /* need to decode minimum of 33 bytes to 160 byte output */
+    if( (*inlen < 50) || (*outlen < 240) ) {
+	fprintf(stderr, "codec_ilbc: inlen = %d outlen= %d\n",*inlen,*outlen);
+	return -1;
+    }
+
+    while( (*inlen >= 50) && (*outlen >= 240) ) {
+	iLBC_decode(fbuf, in, c->decstate, 1);
+	for(i=0;i<240;i++)
+	    out[i] = fbuf[i];
+
+	out += 240;
+	*outlen -= 240;
+	in += 50;
+	*inlen -= 50;
+    }
+
+    return 0;
+}
+
+static int encode ( struct iaxc_audio_codec *c,
+    int *inlen, short *in, int *outlen, char *out ) {
+
+    float fbuf[240];
+    int i;
+
+    while( (*inlen >= 240) && (*outlen >= 50) ) {
+
+	for(i=0;i<240;i++)
+	    fbuf[i] = in[i];
+
+	iLBC_encode(out,fbuf, c->encstate);
+
+	out += 50;
+	*outlen -= 50;
+	in += 240;
+	*inlen -= 240;
+    }
+
+    return 0;
+}
+
+struct iaxc_audio_codec *codec_audio_ilbc_new() {
+  struct iaxc_audio_codec *c = calloc(sizeof(struct iaxc_audio_codec),1);
+
+
+  if(!c) return c;
+
+  strcpy(c->name,"iLBC");
+  c->format = IAXC_FORMAT_ILBC;
+  c->encode = encode;
+  c->decode = decode;
+  c->destroy = destroy;
+
+  c->minimum_frame_size = 240;
+
+  c->encstate = calloc(sizeof(iLBC_Enc_Inst_t),1);
+  c->decstate = calloc(sizeof(iLBC_Dec_Inst_t),1);
+
+  /* leaks a bit on no-memory */
+  if(!(c->encstate && c->decstate))
+      return NULL;
+
+  /* the 30 parameters are used for the latest iLBC sources, in
+   * http://www.ietf.org/internet-drafts/draft-ietf-avt-ilbc-codec-05.txt
+   * as used in asterisk-CVS as of 14 Oct 2004 */
+  initEncode(c->encstate, 30);
+  initDecode(c->decstate, 30, 1); /* use enhancer */
+
+  return c;
+}
+