Example file for sound generation.

diff --git a/lib/example/sound.c b/lib/example/sound.c
new file mode 100644 (file)
index 0000000..8ddf34f
--- /dev/null
+++ b/lib/example/sound.c
@@ -0,0 +1,73 @@
+/* sound.c
+
+   Generates a sine wave and tries to create an swf which
+   plays it as mp3 sound.
+   
+   Part of the swftools package.
+
+   Copyright (c) 2002 Matthias Kramm <kramm@quiss.org>
+ 
+   This file is distributed under the GPL, see file COPYING for details 
+*/
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <math.h>
+#include "../rfxswf.h"
+
+int main (int argc,char ** argv)
+{ SWF swf;
+  RGBA rgb;
+  SRECT r;
+  S32 width=300,height = 300;
+  U16 block[1152*2];
+  TAG * tag;
+  FILE* fi = fopen("test.mp3","wb");
+  FILE* fi2 = fopen("test2.wav","wb");
+  
+  int f,i,ls1,fs1;
+  int count;
+  int t;
+
+  memset(&swf,0x00,sizeof(SWF));        // set global movie parameters
+
+  swf.fileVersion    = 4;               // make flash 4 compatible swf
+  swf.frameRate      = 19*256;          // about 19 frames per second
+  
+  swf.movieSize.xmax = 20*width;        // flash units: 1 pixel = 20 units ("twips")
+  swf.movieSize.ymax = 20*height;
+
+  swf.firstTag = swf_InsertTag(NULL,ST_SETBACKGROUNDCOLOR);
+  tag = swf.firstTag;
+  rgb.r = 0xff;
+  rgb.g = 0xff;
+  rgb.b = 0xff;
+  swf_SetRGB(tag,&rgb);
+  
+  tag = swf_InsertTag(tag, ST_SOUNDSTREAMHEAD2);
+  swf_SetSoundStreamHead(tag, 1152);
+
+  for(t=0;t<64;t++) {
+      int s;
+      tag = swf_InsertTag(tag, ST_SOUNDSTREAMBLOCK);
+      for(s=0;s<1152*2;s++) {
+         block[s] = (int)(32767*sin((s*16*3.14159)/1152));
+      }
+      swf_SetSoundStreamBlock(tag, block, 1152,1);
+      swf_SetSoundStreamBlock(tag, &block[1152], 1152,0);
+      fwrite(&tag->data[4], tag->len-4, 1, fi);
+      fwrite(block, 1152*2*2, 1, fi2);
+      tag = swf_InsertTag(tag, ST_SHOWFRAME);
+  }
+  fclose(fi);
+  fclose(fi2);
+
+  f = open("sound.swf",O_WRONLY|O_CREAT|O_TRUNC, 0644);
+  if FAILED(swf_WriteSWF(f,&swf)) fprintf(stderr,"WriteSWF() failed.\n");
+  close(f);
+
+  swf_FreeTags(&swf);                       // cleanup
+  return 0;
+}
+
+