From: hackbard <hackbard>
Date: Fri, 24 Sep 2004 10:57:57 +0000 (+0000)
Subject: print frequency spectrum using directfb
X-Git-Url: https://hackdaworld.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=10957fd9492f1a6ddd041f69b45e28f9ae8895bf;p=sound-tools%2Fhdrec.git

print frequency spectrum using directfb
---

diff --git a/Makefile b/Makefile
index 6bd5fd0..a27d210 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 # Makefile of hdrec
 
-CFLAGS = -O3 -Wall
+CFLAGS = -O3 -Wall -I/usr/include/directfb
 CC = gcc
 
 TARGETS = hdrec
@@ -8,7 +8,7 @@ TARGETS = hdrec
 all: $(TARGETS)
 
 hdrec:
-	$(CC) $(CFLAGS) -Wall oss_api.c hdrec.c -o hdrec
+	$(CC) $(CFLAGS) -Wall fourier.c oss_api.c hdrec.c -o hdrec -lm -ldirectfb
 
 clean:
 	rm $(OBJS) hdrec
diff --git a/hdrec.c b/hdrec.c
index c6945f5..bf36409 100644
--- a/hdrec.c
+++ b/hdrec.c
@@ -5,6 +5,7 @@
  *
  */
 
+#define _GNU_SOURCE
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -18,9 +19,15 @@
 #include <unistd.h>
 #include <errno.h>
 
+/* dfb */
+#include <directfb.h>
+
 #include "oss_api.h"
 #include "hdrec.h"
 
+/* fourier */
+#include "fourier.h"
+
 int usage(void) {
 	printf("usage:\n\n");
 	printf("-h \t\t print this help\n");
@@ -61,6 +68,18 @@ int main(int argc,char **argv) {
 	struct timeval fds_tv;
 	char c;
 
+	/* dfb */
+	IDirectFB *dfb;
+	IDirectFBSurface *primary;
+	DFBSurfaceDescription dsc;
+	int width,height;
+
+	/* fourier */
+	t_fourier fourier;
+	int sample;
+	int dx;
+	int a_f;
+
 	/* defaults */
 	strcpy(device,"");
 	set.format=AFMT_S16_LE;
@@ -192,6 +211,7 @@ int main(int argc,char **argv) {
 		perror("malloc");
 		return -1;
 	}
+
 	if((mode&RECORD) && (mode&PLAY)) {
 		if((buf2=malloc(set.bufsize*sizeof(unsigned char)))==NULL) {
 			printf("allocating 2nd memory failed :(\n");
@@ -201,12 +221,49 @@ int main(int argc,char **argv) {
 	}
 
 	if((mode&PLAY) && (!(mode&RECORD))) {
+
+	/* dfb */
+	DirectFBInit(&argc,&argv);
+	DirectFBCreate(&dfb);
+	dfb->SetCooperativeLevel(dfb,DFSCL_FULLSCREEN);
+	dsc.flags=DSDESC_CAPS;
+	dsc.caps=DSCAPS_PRIMARY|DSCAPS_FLIPPING;
+	dfb->CreateSurface(dfb,&dsc,&primary);
+	primary->GetSize(primary,&width,&height);
+	dprintf(1,"graphical equalizer dims: %dx%d\n",width,height);
+	primary->SetColor(primary,0x80,0x80,0xff,0xff);
+	//primary->Flip(primary,NULL,DSFLIP_WAITFORSYNC);
+
+	/* fourier */
+	fourier_init(&fourier,1);
+	fourier.type=FWD|DFT;
+	fourier.dim=1;
+	fourier.data_len[0]=set.bufsize/(set.format&AFMT_S16_LE?4:2);
+	fourier_alloc_data(&fourier);
+	printf("debug: allocated size for %d samples to do dft\n",fourier.data_len[0]);
+	dx=8*width/fourier.data_len[0];
+	printf("debug: dx = %d ???\n",dx);
+
 		printf("playing file %s ...\n",play_file);
 		if(mode&REVERSED) printf("but we do it reversed!\n");
 		rw=1;
 		if(!(mode&REVERSED)) {
 			while(rw) {
+				/* read samples */
 				rw=read(pfile_fd,buf,set.bufsize);
+				/* do fourier trafo */
+				for(sample=0;sample<fourier.data_len[0];sample++) fourier.data[sample].r=*((signed short *)buf+(set.format&AFMT_S16_LE?2:1)*sample);
+				fourier_dft_1d(&fourier);
+				/* print graph */
+				primary->Clear(primary,0,0,0,0xff);
+				a_f=dx*fourier.data_len[0]*440/set.freq;
+				primary->DrawLine(primary,a_f,height,a_f,0);
+				for(sample=0;sample<fourier.data_len[0]/8;sample++) primary->FillRectangle(primary,sample*dx,0,dx,height*sqrt(fourier.ftdata[sample].r*fourier.ftdata[sample].r+fourier.ftdata[sample].i*fourier.ftdata[sample].i)/0x7fff);
+				primary->Flip(primary,NULL,DSFLIP_WAITFORSYNC);
+				//fcount=0;
+
+				//}
+
 				write(audio_fd,buf,set.bufsize);
 			}
 		} else {
@@ -229,6 +286,11 @@ int main(int argc,char **argv) {
 				write(audio_fd,buf,set.bufsize);
 			}
 		}
+
+		/* dfb release */
+		primary->Release(primary);
+		dfb->Release(dfb);
+
 	}
 
 	if((mode&RECORD) && (!(mode&PLAY))) {