[Bf-blender-cvs] SVN commit: /data/svn/bf-blender [17038] trunk/blender/intern/SoundSystem/ intern/SND_Utils.cpp: read wave files block align value, rather then assuming 2 or 4.

[Campbell Barton]

Revision: 17038
          http://projects.blender.org/plugins/scmsvn/viewcvs.php?view=rev&root=bf-blender&revision=17038
Author:   campbellbarton
Date:     2008-10-12 09:58:05 +0200 (Sun, 12 Oct 2008)

Log Message:
-----------
read wave files block align value, rather then assuming 2 or 4.

Modified Paths:
--------------
    trunk/blender/intern/SoundSystem/intern/SND_Utils.cpp

Modified: trunk/blender/intern/SoundSystem/intern/SND_Utils.cpp
===================================================================
--- trunk/blender/intern/SoundSystem/intern/SND_Utils.cpp	2008-10-12 06:39:47 UTC (rev 17037)
+++ trunk/blender/intern/SoundSystem/intern/SND_Utils.cpp	2008-10-12 07:58:05 UTC (rev 17038)
@@ -287,21 +287,27 @@
 /* gets the length of the actual sample data (without the header) */
 unsigned int SND_GetNumberOfSamples(void* sample, int sample_length)
 {
-	unsigned int chunklength, length = 0, offset = 16;
-	
+	unsigned int chunklength, length = 0, offset;
+	unsigned short block_align;
 	if (CheckSample(sample))
 	{
-		memcpy(&chunklength, ((char*)sample) + offset, 4);
+		memcpy(&chunklength, ((char*)sample) + 16, 4);
+		memcpy(&block_align, ((char*)sample) + 32, 2); /* always 2 or 4 it seems */
+		
 		/* This was endian unsafe. See top of the file for the define. */
-		if (SND_fEndian == SND_endianBig) SWITCH_INT(chunklength);
+		if (SND_fEndian == SND_endianBig)
+		{
+			SWITCH_INT(chunklength);
+			SWITCH_SHORT(block_align);
+		}
+				
+		offset = 16 + chunklength + 4;
 
-		offset = offset + chunklength + 4;
-
 		/* This seems very unsafe, what if data is never found (f.i. corrupt file)... */
 		// lets find "data"
 		while (memcmp(((char*)sample) + offset, "data", 4))
 		{
-			offset += 2;
+			offset += block_align;
 			
 			if (offset+4 > sample_length) /* save us from crashing */
 				return 0;
@@ -322,18 +328,24 @@
 unsigned int SND_GetHeaderSize(void* sample, int sample_length)
 {
 	unsigned int chunklength, headersize = 0, offset = 16;
-	
+	unsigned short block_align;
 	if (CheckSample(sample))
 	{
 		memcpy(&chunklength, ((char*)sample) + offset, 4);
+		memcpy(&block_align, ((char*)sample) + 32, 2); /* always 2 or 4 it seems */
+		
 		/* This was endian unsafe. See top of the file for the define. */
-		if (SND_fEndian == SND_endianBig) SWITCH_INT(chunklength);
+		if (SND_fEndian == SND_endianBig)
+		{
+			SWITCH_INT(chunklength);
+			SWITCH_SHORT(block_align);
+		}
 		offset = offset + chunklength + 4;
 
 		// lets find "data"
 		while (memcmp(((char*)sample) + offset, "data", 4))
 		{
-			offset += 2;
+			offset += block_align;
 			
 			if (offset+4 > sample_length) /* save us from crashing */
 				return 0;
@@ -341,12 +353,10 @@
 		headersize = offset + 8;
 	}
 
-
 	return headersize;
 }
 
 
-
 unsigned int SND_GetExtraChunk(void* sample)
 {
 	unsigned int extrachunk = 0, chunklength, offset = 16;