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List:       kde-multimedia
Subject:    Re: How to use Synth_AMAN_PLAY
From:       Malte Starostik <malte () kde ! org>
Date:       2002-01-15 16:54:53
[Download RAW message or body]

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Am Tuesday 15 January 2002 15:18 schrieb Stefan Westerfeld:
>    Hi!
>
[snip]
> What you want to do instead is create the Synth_AMAN_PLAY object inside
> artsd (not in your process), like
>
> Synth_AMAN_PLAY play =
> DynamicCast(server.createObject("Arts::Synth_AMAN_PLAY"));
> if(!play.isNull()) {
> 	play.title("foo");
> }
Thanks alot, exactly what I was looking for :))

Attached is a new patch to implement ARTS_P_VOLUME for output streams in artsc 
and a small test proggie. Is it okay to do it this way? If so, I'd like to 
send a patch to the xine authors... :)
- -- 
Malte Starostik
PGP: 1024D/D2F3C787 [C138 2121 FAF3 410A 1C2A  27CD 5431 7745 D2F3 C787]
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["Makefile" (text/x-makefile)]


CFLAGS := $(shell artsc-config --cflags)
LDFLAGS := $(shell artsc-config --libs) -Wl,--rpath -Wl,$(shell artsc-config --arts-prefix)/lib -lm

voltest: voltest.o
	gcc -o $@ $(LDFLAGS) $<

voltest.o: voltest.c
	gcc -c -o $@ $(CFLAGS) $<

clean:
	rm -f voltest voltest.o

["voltest.c" (text/x-csrc)]


#include <math.h>
#include <stdint.h>
#include <sys/signal.h>

#include <artsc.h>

int intr = 0;

void sig_handler(int sig)
{
	intr = 1;
}

int main()
{
	arts_stream_t str;
	int16_t data[44100];
	int i, vol = 100;

	arts_init();
	str = arts_play_stream(44100, 16, 1, "Volume Test");

	for (i = 0; i < 44100; ++i)
		data[i] = floor(sin(i * 2.0 * M_PI / 100.0) * 0x7fff);

	signal(SIGINT, sig_handler);

	for (i = 0; !intr; ++i)
	{
		arts_stream_set(str, ARTS_P_VOLUME, 50 + floor(cos((i % 20) * 2.0 * M_PI / 20.0) * 50.0));
		arts_write(str, data, sizeof(data));
	}

	arts_close_stream(str);
	arts_free();
}


["artsc.diff" (text/x-diff)]

Index: artsc.h
===================================================================
RCS file: /home/kde/kdelibs/arts/artsc/artsc.h,v
retrieving revision 1.9
diff -u -3 -d -p -r1.9 artsc.h
--- artsc.h	2000/12/07 22:21:15	1.9
+++ artsc.h	2002/01/15 16:26:17
@@ -64,7 +64,8 @@ enum arts_parameter_t_enum {
     ARTS_P_BLOCKING = 6,
     ARTS_P_PACKET_SIZE = 7,
     ARTS_P_PACKET_COUNT = 8,
-	ARTS_P_PACKET_SETTINGS = 9
+	ARTS_P_PACKET_SETTINGS = 9,
+	ARTS_P_VOLUME = 10
 };
 
 /**
@@ -125,6 +126,9 @@ enum arts_parameter_t_enum {
  *   The format is 0xCCCCSSSS, where 2^SSSS is the packet size, and CCCC is
  *   the packet count. Note that when writing this, you don't necessarily
  *   get the settings you requested.
+ *
+ * @li ARTS_P_VOLUME (rw)
+ *   This sets / retrieves the stream's volume (0-100).
  */
 typedef enum arts_parameter_t_enum arts_parameter_t;
 
Index: artscbackend.cc
===================================================================
RCS file: /home/kde/kdelibs/arts/artsc/artscbackend.cc,v
retrieving revision 1.18
diff -u -3 -d -p -r1.18 artscbackend.cc
--- artscbackend.cc	2001/11/30 15:24:20	1.18
+++ artscbackend.cc	2002/01/15 16:26:17
@@ -27,6 +27,7 @@
 #include "artsc.h"
 #include "soundserver.h"
 #include "stdsynthmodule.h"
+#include "connect.h"
 
 #include <stdio.h>
 #include <unistd.h>
@@ -425,6 +426,10 @@ class Sender :	public ByteSoundProducer_
 	 * this object although not using smartwrappers to access it
 	 */
 	ByteSoundProducer bsWrapper;
+	ByteStreamToAudio convert;
+	StereoVolumeControl volume;
+	Synth_AMAN_PLAY out;
+	int _volume;
 
 protected:
 	virtual void attach()
@@ -433,8 +438,20 @@ protected:
 		{
 			isAttached = true;
 
-			server.attach(bsWrapper);
+			convert.samplingRate(_samplingRate);
+			convert.channels(_channels);
+			convert.bits(_bits);
+
+			connect(bsWrapper, "outdata", convert, "indata");
+			connect(convert, volume);
+			connect(volume, out);
+
+			out.title(_name);
+
 			start();
+			convert.start();
+			volume.start();
+			out.start();
 
             /*
              * TODO: this processOneEvent looks a bit strange here... it is
@@ -452,11 +469,41 @@ protected:
 
 public:
 	Sender(SoundServer server, int rate, int bits, int channels,
-		string name) : Stream( server, rate, bits, channels, name)
+		string name) : Stream( server, rate, bits, channels, name),
+		               convert(DynamicCast(server.createObject("Arts::ByteStreamToAudio"))),
+		               volume(DynamicCast(server.createObject("Arts::StereoVolumeControl"))),
+		               out(DynamicCast(server.createObject("Arts::Synth_AMAN_PLAY")))
 	{
 		bsWrapper = ByteSoundProducer::_from_base(this);
 	}
 
+	virtual int stream_set(arts_parameter_t param, int value)
+	{
+		switch (param)
+		{
+			case ARTS_P_VOLUME:
+				if (value < 0 || value > 100) return ARTS_E_NOIMPL;
+
+				volume.scaleFactor(value / 100.0);
+				return value;
+
+			default:
+				return Stream::stream_set(param, value);
+		}
+	}
+
+	virtual int stream_get(arts_parameter_t param)
+	{
+		switch (param)
+		{
+			case ARTS_P_VOLUME:
+				return (int) (volume.scaleFactor() * 100.0);
+
+			default:
+				return Stream::stream_get(param);
+		}
+	}
+	
 	virtual ~Sender() {
 		//
 	}

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