add set gain in DB for MSVolume

include/mediastreamer2/mscommon.h

@@ -173,7 +173,7 @@ void ms_sleep(int seconds);
  * The max payload size allowed.
  * Filters that generate data that can be sent through RTP should make packets
  * whose size is below ms_get_payload_max_size().
- * The default value is 1440 computed as the standart internet MTU minus IPv6 header,
+ * The default value is 1440 computed as the standard internet MTU minus IPv6 header,
  * UDP header and RTP header. As IPV4 header is smaller than IPv6 header, this 
  * value works for both.
  * 

include/mediastreamer2/msvolume.h

@@ -58,6 +58,9 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
 #define MS_VOLUME_SET_NOISE_GATE_FLOORGAIN MS_FILTER_METHOD(MS_VOLUME_ID,12,float)
 
+/* set a gain in db */
+#define MS_VOLUME_SET_DB_GAIN		MS_FILTER_METHOD(MS_VOLUME_ID,13,float)
+
 extern MSFilterDesc ms_volume_desc;
 
 #endif

src/gsm.c

@@ -47,15 +47,17 @@ static void enc_uninit(MSFilter *f){
 static void enc_process(MSFilter *f){
 	EncState *s=(EncState*)f->data;
 	mblk_t *im;
-	int16_t buf[160];
+	int16_t buf[320];
 	
 	while((im=ms_queue_get(f->inputs[0]))!=NULL){
 		ms_bufferizer_put(s->bufferizer,im);
 	}
 	while(ms_bufferizer_read(s->bufferizer,(uint8_t*)buf,sizeof(buf))==sizeof(buf)) {
-		mblk_t *om=allocb(33,0);
+		mblk_t *om=allocb(66,0);
 		gsm_encode(s->state,(gsm_signal*)buf,(gsm_byte*)om->b_wptr);
 		om->b_wptr+=33;
+		gsm_encode(s->state,(gsm_signal*)(buf+160),(gsm_byte*)om->b_wptr);
+		om->b_wptr+=33;
 		mblk_set_timestamp_info(om,s->ts);
 		ms_queue_put(f->outputs[0],om);
 		s->ts+=sizeof(buf)/2;

src/msvolume.c

@@ -106,7 +106,6 @@ static int volume_get(MSFilter *f, void *arg){
 	float *farg=(float*)arg;
 	Volume *v=(Volume*)f->data;
 	*farg=10*ortp_log10f((v->energy+1)/max_e);
-
 	return 0;
 }
 
@@ -199,6 +198,14 @@ static void volume_noise_gate_process(Volume *v , float energy, mblk_t *om){
 	}
 }
 
+static int volume_set_db_gain(MSFilter *f, void *gain){
+	float *fgain=(float*)gain;
+	Volume *v=(Volume*)f->data;
+	v->gain=v->static_gain=v->target_gain = pow(10,(*fgain)/10);
+	ms_message("MSVolume set gain to [%f db], [%f] linear",*fgain,v->gain);
+	return 0;
+}
+
 static int volume_set_gain(MSFilter *f, void *arg){
 	float *farg=(float*)arg;
 	Volume *v=(Volume*)f->data;
@@ -391,6 +398,7 @@ static MSFilterMethod methods[]={
 	{	MS_VOLUME_ENABLE_NOISE_GATE,	volume_enable_noise_gate},
 	{	MS_VOLUME_SET_NOISE_GATE_THRESHOLD,	volume_set_noise_gate_threshold},
 	{	MS_VOLUME_SET_NOISE_GATE_FLOORGAIN,	volume_set_noise_gate_floorgain},
+	{	MS_VOLUME_SET_DB_GAIN	,	volume_set_db_gain		},
 	{	0			,	NULL			}
 };