FS-8364: mod_codec2 : improvements, add extra modes: 3200,1400,1200. add config file.

src/mod/codecs/mod_codec2/mod_codec2.c

@@ -23,6 +23,7 @@
  *
  * Contributor(s):
  * Mathieu Rene <mrene@avgs.ca>
+ * Dragos Oancea <droancea@yahoo.com>
  *
  * mod_codec2 -- FreeSWITCH CODEC2 Module
  *
@@ -51,6 +52,10 @@ SWITCH_MODULE_DEFINITION(mod_codec2, mod_codec2_load, NULL, NULL);
 struct codec2_context {
 	void *encoder;
 	void *decoder;
+	int mode; /* codec2 operation mode */
+	int nbit; /* nr of bits per frame */
+	int nbyte; /* nr of bytes per frame */
+	int nsam; /* nr of samples per frame */
 #ifdef LOG_DATA	
 	FILE *encoder_in;
 	FILE *encoder_out;
@@ -61,6 +66,12 @@ struct codec2_context {
 #endif
 };
 
+struct {
+	int mode;
+	int ptime;
+	int samples_per_frame;
+} codec2_prefs;
+
 #ifdef LOG_DATA
 static int c2_count = 0;
 #endif
@@ -81,13 +92,38 @@ static switch_status_t switch_codec2_init(switch_codec_t *codec, switch_codec_fl
 		return SWITCH_STATUS_FALSE;
 	}
 
+	if (!codec2_prefs.mode) {
+		codec2_prefs.mode = CODEC2_MODE_2400;
+	}
+
+	if (codec2_prefs.mode == 3200) {
+			context->mode = CODEC2_MODE_3200;
+	} else if (codec2_prefs.mode == 2400) {
+			context->mode = CODEC2_MODE_2400;
+	} else if (codec2_prefs.mode == 1400) {
+			context->mode = CODEC2_MODE_1400;
+	} else if (codec2_prefs.mode == 1200) {
+			context->mode = CODEC2_MODE_1200;
+	} else {
+		/* 3200 might be better for VOIP, but forcing 2400 for backwards compatibility  */
+		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "mode not supported, forcing CODEC2_MODE_2400. You can try mode 3200 too!\n");
+		context->mode = CODEC2_MODE_2400; 
+	}
+	
 	if (encoding) {
-		context->encoder = codec2_create(CODEC2_MODE_2400);		
+		context->encoder = codec2_create(context->mode);
 	}
 	
 	if (decoding) {
-		context->decoder = codec2_create(CODEC2_MODE_2400);
+		context->decoder = codec2_create(context->mode);
+	}
+
+	context->nsam = codec2_samples_per_frame(context->encoder);
+	if (!context->nsam) {
+		context->nsam = CODEC2_SAMPLES_PER_FRAME;
 	}
+	context->nbit = codec2_bits_per_frame(context->encoder);
+	context->nbyte = (context->nbit + 7) / 8;
 
 	codec->private_info = context;
 	
@@ -136,7 +172,7 @@ static switch_status_t switch_codec2_encode(switch_codec_t *codec, switch_codec_
 {
 	struct codec2_context *context = codec->private_info;
 	
-	codec2_assert(decoded_data_len == CODEC2_SAMPLES_PER_FRAME * 2);
+	codec2_assert(decoded_data_len == context->nsam * 2);
 	
 #ifdef LOG_DATA	
 	fwrite(decoded_data, decoded_data_len, 1, context->encoder_in);
@@ -148,11 +184,11 @@ static switch_status_t switch_codec2_encode(switch_codec_t *codec, switch_codec_
 #ifdef LOG_DATA	
 	fwrite(encode_buf, sizeof(encode_buf), 1, context->encoder_out_unpacked);
 	fflush(context->encoder_out_unpacked);
-	fwrite(encoded_data, 8, 1, context->encoder_out);
+	fwrite(encoded_data, context->nbyte, 1, context->encoder_out);
 	fflush(context->encoder_out);
 #endif
 	
-	*encoded_data_len = 6;
+	*encoded_data_len = context->nbyte;
 
 	return SWITCH_STATUS_SUCCESS;
 }
@@ -169,7 +205,7 @@ static switch_status_t switch_codec2_decode(switch_codec_t *codec,
 {
 	struct codec2_context *context = codec->private_info;
 	
-	codec2_assert(encoded_data_len == 8 /* aligned to 8 */);
+	codec2_assert(encoded_data_len == 8);
 	
 #ifdef LOG_DATA	
 	fwrite(encoded_data, encoded_data_len, 1, context->decoder_in);
@@ -181,11 +217,11 @@ static switch_status_t switch_codec2_decode(switch_codec_t *codec,
 	codec2_decode(context->decoder, decoded_data, encoded_data);
 
 #ifdef LOG_DATA	
-	fwrite(decoded_data, CODEC2_SAMPLES_PER_FRAME, 2, context->decoder_out);
+	fwrite(decoded_data, context->nsam, 2, context->decoder_out);
 	fflush(context->decoder_out);
 #endif
 
-	*decoded_data_len = CODEC2_SAMPLES_PER_FRAME * 2; /* 160 samples */
+	*decoded_data_len = context->nsam * 2; /* eg: 160 samples for 3200,2400 */
 	
 	return SWITCH_STATUS_SUCCESS;
 }
@@ -224,13 +260,58 @@ static switch_status_t switch_codec2_destroy(switch_codec_t *codec)
 	return SWITCH_STATUS_SUCCESS;
 }
 
+static switch_status_t codec2_load_config(switch_bool_t reload) {
+
+	char *cf = "codec2.conf";
+	switch_xml_t cfg, xml = NULL, param, settings;
+	switch_status_t status = SWITCH_STATUS_SUCCESS;
+
+	codec2_prefs.mode = 2400 ; 
+
+	if (!(xml = switch_xml_open_cfg(cf, &cfg, NULL))) {
+		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Opening of %s failed\n", cf);
+		return status;
+	}
+
+	if ((settings = switch_xml_child(cfg, "settings"))) {
+		for (param = switch_xml_child(settings, "param"); param; param = param->next) {
+			char *key = (char *) switch_xml_attr_soft(param, "name");
+			char *val = (char *) switch_xml_attr_soft(param, "value");
+
+			if (!strcasecmp(key, "mode") && !zstr(val)) {
+				codec2_prefs.mode = atoi(val);
+			}
+		}
+	}
+	
+	if (xml) {
+		switch_xml_free(xml);
+	}
+
+	return status;
+}
+
 SWITCH_MODULE_LOAD_FUNCTION(mod_codec2_load)
 {
 	switch_codec_interface_t *codec_interface;
+	switch_status_t status = SWITCH_STATUS_SUCCESS;
+
+	if ((status = codec2_load_config(SWITCH_FALSE)) != SWITCH_STATUS_SUCCESS) {
+		return status;
+	}
 
 	*module_interface = switch_loadable_module_create_module_interface(pool, modname);
 	
-	SWITCH_ADD_CODEC(codec_interface, "CODEC2 2400bps");
+	/*there is no API call to retrieve ptime per mode, so hardcoding here*/
+	if ((codec2_prefs.mode == 3200) ||(codec2_prefs.mode == 2400)) {
+		codec2_prefs.ptime = 20000;
+		codec2_prefs.samples_per_frame = CODEC2_SAMPLES_PER_FRAME;  
+	} else {
+		codec2_prefs.ptime = 40000;
+		codec2_prefs.samples_per_frame = CODEC2_SAMPLES_PER_FRAME * 2;  
+	}
+
+	SWITCH_ADD_CODEC(codec_interface, "CODEC2 3200/2400/1400/1200bps");
 
 	switch_core_codec_add_implementation(pool, codec_interface,
 							 SWITCH_CODEC_TYPE_AUDIO,
@@ -239,10 +320,10 @@ SWITCH_MODULE_LOAD_FUNCTION(mod_codec2_load)
 							 NULL,
 							 8000, /* samples/sec */
 							 8000, /* samples/sec */
-							 2400, /* bps */
-							 20000, /* ptime */
-							 CODEC2_SAMPLES_PER_FRAME,	/* samples decoded */
-							 CODEC2_SAMPLES_PER_FRAME*2,	/* bytes decoded */
+							 codec2_prefs.mode, /* bps */
+							 codec2_prefs.ptime, /* ptime */
+							 codec2_prefs.samples_per_frame,	/* samples decoded */
+							 codec2_prefs.samples_per_frame * 2,	/* bytes decoded */
 							 0,	/* bytes encoded */
 							 1,	/* channels */
 							 1,	/* frames/packet */