Add SHM display for outputting directly to shared memory.

colorchord2/DisplaySHM.c

@@ -0,0 +1,77 @@
+//Copyright 2015 <>< Charles Lohr under the ColorChord License.
+
+#include "outdrivers.h"
+#include "notefinder.h"
+#include <stdio.h>
+#include "parameters.h"
+#include <stdlib.h>
+#include <math.h>
+#include <string.h>
+#include "color.h"
+#include "DrawFunctions.h"
+#include <sys/mman.h>
+#include <sys/stat.h>        /* For mode constants */
+#include <fcntl.h>           /* For O_* constants */
+#include <unistd.h>
+
+struct SHMDriver
+{
+	int lights_file;
+	//int dft_file; //Not available.
+	//uint8_t * dft_ptr;
+	uint8_t * lights_ptr;
+	//int total_dft;
+	int total_leds;
+};
+
+
+static void SHMUpdate(void * id, struct NoteFinder*nf)
+{
+	struct SHMDriver * d = (struct SHMDriver*)id;
+
+
+	if( !d->lights_file )
+	{
+		const char * shm_lights = GetParameterS( "shm_lights", 0 );
+		//const char * shm_dft    = GetParameterS( "shm_dft", 0 ); // Not available.
+
+		if( shm_lights )
+		{
+			d->lights_file = shm_open(shm_lights, O_CREAT | O_RDWR, 0644);
+			ftruncate( d->lights_file, 16384 );
+			d->lights_ptr = mmap(0,16384, PROT_READ | PROT_WRITE, MAP_SHARED, d->lights_file, 0);
+		}
+
+		printf( "Got SHM: %s->%d [%p]\n", shm_lights, d->lights_file, d->lights_ptr );
+	}
+
+
+	if( d->lights_ptr )
+	{
+		memcpy( d->lights_ptr, &d->total_leds, 4 );
+		memcpy( d->lights_ptr + 4, OutLEDs, d->total_leds*3 ); 
+	}
+
+}
+
+static void SHMParams(void * id )
+{
+	struct SHMDriver * d = (struct SHMDriver*)id;
+
+	d->total_leds = 300;	RegisterValue( "leds", PAINT, &d->total_leds, sizeof( d->total_leds ));
+}
+
+static struct DriverInstances * DisplaySHM(const char * parameters)
+{
+	struct DriverInstances * ret = malloc( sizeof( struct DriverInstances ) );
+	struct SHMDriver * d = ret->id = malloc( sizeof( struct SHMDriver ) );
+	memset( d, 0, sizeof( struct SHMDriver ) );
+	ret->Func = SHMUpdate;
+	ret->Params = SHMParams;
+	SHMParams( d );
+	return ret;
+}
+
+REGISTER_OUT_DRIVER(DisplaySHM);
+
+

colorchord2/Makefile

@@ -3,14 +3,14 @@ all : colorchord
 RAWDRAW:=DrawFunctions.o XDriver.o
 SOUND:=sound.o sound_alsa.o sound_pulse.o sound_null.o
 
-OUTS := OutputVoronoi.o DisplayArray.o OutputLinear.o DisplayPie.o DisplayNetwork.o DisplayUSB2812.o DisplayDMX.o OutputProminent.o RecorderPlugin.o DisplayHIDAPI.o hidapi.o OutputCells.o
+OUTS := OutputVoronoi.o DisplayArray.o OutputLinear.o DisplayPie.o DisplayNetwork.o DisplayUSB2812.o DisplayDMX.o OutputProminent.o RecorderPlugin.o DisplayHIDAPI.o hidapi.o OutputCells.o DisplaySHM.o
 
 WINGCC:= i686-w64-mingw32-gcc
 WINGCCFLAGS:= -g -DICACHE_FLASH_ATTR= -I../embeddedcommon -I. -O1   #-O2 -Wl,--relax -Wl,--gc-sections -ffunction-sections -fdata-sections
 WINLDFLAGS:=-lwinmm -lgdi32 -lws2_32  -lsetupapi
 
 RAWDRAWLIBS:=-lX11 -lm -lpthread -lXinerama -lXext
-LDLIBS:=-lpthread -lasound -lm -lpulse-simple -lpulse -ludev
+LDLIBS:=-lpthread -lasound -lm -lpulse-simple -lpulse -ludev -lrt
 
 
 CFLAGS:=-g -Os -flto -Wall -ffast-math -I../embeddedcommon -I. -DICACHE_FLASH_ATTR=