Add NV12 and NV21 AVI tags.

Both are listed in fourcc.org.

Originally committed as revision 23145 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/raw.c

@@ -64,6 +64,8 @@ const PixelFormatTag ff_raw_pixelFormatTags[] = {
     { PIX_FMT_UYVY422, MKTAG('V', 'D', 'T', 'Z') }, /* SoftLab-NSK VideoTizer */
     { PIX_FMT_UYYVYY411, MKTAG('Y', '4', '1', '1') },
     { PIX_FMT_GRAY8,   MKTAG('G', 'R', 'E', 'Y') },
+    { PIX_FMT_NV12,    MKTAG('N', 'V', '1', '2') },
+    { PIX_FMT_NV21,    MKTAG('N', 'V', '2', '1') },
 
     /* nut */
     { PIX_FMT_RGB555LE, MKTAG('R', 'G', 'B', 15) },

libavformat/riff.c

@@ -169,6 +169,8 @@ const AVCodecTag ff_codec_bmp_tags[] = {
     { CODEC_ID_RAWVIDEO,     MKTAG('Y', 'V', 'U', '9') },
     { CODEC_ID_RAWVIDEO,     MKTAG('V', 'D', 'T', 'Z') }, /* SoftLab-NSK VideoTizer */
     { CODEC_ID_RAWVIDEO,     MKTAG('Y', '4', '1', '1') },
+    { CODEC_ID_RAWVIDEO,     MKTAG('N', 'V', '1', '2') },
+    { CODEC_ID_RAWVIDEO,     MKTAG('N', 'V', '2', '1') },
     { CODEC_ID_FRWU,         MKTAG('F', 'R', 'W', 'U') },
     { CODEC_ID_R210,         MKTAG('r', '2', '1', '0') },
     { CODEC_ID_V210,         MKTAG('v', '2', '1', '0') },