endianness for ogg vorbis

git-svn-id: svn://svn.code.sf.net/p/actiongame/code/trunk/ac@1950 e016b1c5-ed68-44aa-a2f7-31cac88cffde

source/src/sound.cpp

@@ -118,7 +118,7 @@ struct oggstream
         int bitstream;
         while(size < BUFSIZE)
         {
-            long bytes = ov_read(&oggfile, pcm + size, BUFSIZE - size, 0, 2, 1, &bitstream);
+            long bytes = ov_read(&oggfile, pcm + size, BUFSIZE - size, isbigendian(), 2, 1, &bitstream);
             if(bytes > 0) size += bytes;
             else if (bytes < 0) return false;
             else break; // done
@@ -242,7 +242,7 @@ struct sbuffer
                     if(!SDL_LoadWAV(file, &wavspec, &wavbuf, &wavlen)) continue;
                     
                     ALenum format;
-                    switch(wavspec.freq)
+                    switch(wavspec.freq) // map format definitions from SDL to OpenAL
                     {
                         case AUDIO_U8: format = AL_FORMAT_STEREO8; break;
                         case AUDIO_S8: format = AL_FORMAT_MONO8; break;

source/src/tools.cpp

@@ -263,3 +263,9 @@ void endianswap(void *memory, int stride, int length)   // little endian as stor
         p[stride-i-1] = t;
     }
 }
+
+bool isbigendian()
+{
+    long one = 1;
+    return !(*((char *)(&one)));
+}

source/src/tools.h

@@ -506,6 +506,7 @@ extern bool delfile(const char *path);
 extern bool cmpb(void *b, int n, enet_uint32 c);
 extern bool cmpf(char *fn, enet_uint32 c);
 extern void endianswap(void *, int, int);
+extern bool isbigendian();
 
 #endif