Add fourccs for Wavpak and TTA

Patch by yong ||| y0ngc |a| yahoo dot com |||

Originally committed as revision 6579 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/riff.c

@@ -194,6 +194,8 @@ const CodecTag codec_wav_tags[] = {
     { CODEC_ID_ADPCM_SWF, ('S'<<8)+'F' },
     { CODEC_ID_TRUESPEECH, 0x22 },
     { CODEC_ID_FLAC, MKTAG('f', 'L', 'a', 'C') },
+    { CODEC_ID_TTA, MKTAG('T', 'T', 'A', '1') },
+    { CODEC_ID_WAVPACK, MKTAG('W', 'V', 'P', 'K') },
 
     // for NuppelVideo (nuv.c)
     { CODEC_ID_PCM_S16LE, MKTAG('R', 'A', 'W', 'A') },