first commit

2022-10-20 20:29:11 +08:00
commit 4d531f8044
3238 changed files with 1387862 additions and 0 deletions
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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_gsm.h"
+#include "iaxclient_lib.h"
+#include "gsm.h"
+
+struct state {
+    gsm gsmstate;
+    plc_state_t plc;
+};
+
+
+static void destroy ( struct iaxc_audio_codec *c) {
+
+    struct state * encstate = (struct state *) c->encstate;
+    struct state * decstate = (struct state *) c->decstate;
+
+    gsm_destroy(encstate->gsmstate);
+    gsm_destroy(decstate->gsmstate);
+    free(c->encstate);
+    free(c->decstate);
+    free(c);
+}
+
+
+static int decode ( struct iaxc_audio_codec *c,
+    int *inlen, unsigned char *in, int *outlen, short *out ) {
+    struct state * decstate = (struct state *) c->decstate;
+
+    /* use generic interpolation */
+    if(*inlen == 0) {
+        int interp_len = 160;
+        if(*outlen < interp_len) interp_len = *outlen;
+        plc_fillin(&decstate->plc,out,interp_len);
+        *outlen -= interp_len;
+        return 0;
+    }
+
+    /* need to decode minimum of 33 bytes to 160 byte output */
+    while( (*inlen >= 33) && (*outlen >= 160) ) {
+	if(gsm_decode(decstate->gsmstate, in, out))
+	{
+	    fprintf(stderr, "codec_gsm: gsm_decode returned error\n");
+	    return -1;
+	}
+
+	/* push decoded data to interpolation buffer */
+	plc_rx(&decstate->plc,out,160);
+
+	/* we used 33 bytes of input, and 160 bytes of output */
+	*inlen -= 33;
+	in += 33;
+	*outlen -= 160;
+	out += 160;
+    }
+
+    return 0;
+}
+
+static int encode ( struct iaxc_audio_codec *c,
+    int *inlen, short *in, int *outlen, unsigned char *out ) {
+
+    struct state * encstate = (struct state *) c->encstate;
+
+
+    /* need to encode minimum of 160 bytes to 33 byte output */
+    while( (*inlen >= 160) && (*outlen >= 33) ) {
+	gsm_encode(encstate->gsmstate, in, out);
+
+	/* we used 160 bytes of input, and 33 bytes of output */
+	*inlen -= 160;
+	in += 160;
+	*outlen -= 33;
+	out += 33;
+    }
+
+    return 0;
+}
+
+struct iaxc_audio_codec *codec_audio_gsm_new() {
+
+  struct state * encstate;
+  struct state * decstate;
+  struct iaxc_audio_codec *c = (struct iaxc_audio_codec *)calloc(sizeof(struct iaxc_audio_codec),1);
+
+
+  if(!c) return c;
+
+  strcpy(c->name,"gsm 06.10");
+  c->format = IAXC_FORMAT_GSM;
+  c->encode = encode;
+  c->decode = decode;
+  c->destroy = destroy;
+
+  c->minimum_frame_size = 160;
+
+  c->encstate = calloc(sizeof(struct state),1);
+  c->decstate = calloc(sizeof(struct state),1);
+
+  /* leaks a bit on no-memory */
+  if(!(c->encstate && c->decstate))
+      return NULL;
+
+  encstate = (struct state *) c->encstate;
+  decstate = (struct state *) c->decstate;
+
+  encstate->gsmstate = gsm_create();
+  decstate->gsmstate = gsm_create();
+
+  if(!(encstate->gsmstate && decstate->gsmstate))
+      return NULL;
+
+  return c;
+}
+