avutil/pixfmt: fix AV_PIX_FMT_RGB8 description

Previously AV_PIX_FMT_RGB8 was documented as "RGB 3:3:2,
(msb)2R 3G 3B(lsb)".  While the RGB 3:3:2 part is correct, the latter
part should be: (msb)3R 3G 2B(lsb).  This commit also updates the
format's pixdesc description to be (msb)3R 3G 2B(lsb).

Signed-off-by: Jeffrey Knockel <jeff@jeffreyknockel.com>
Reviewed-by: "Diederick C. Niehorster" <dcnieho@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavutil/pixdesc.c

@@ -530,9 +530,9 @@ static const AVPixFmtDescriptor av_pix_fmt_descriptors[AV_PIX_FMT_NB] = {
         .log2_chroma_w = 0,
         .log2_chroma_h = 0,
         .comp = {
-            { 0, 1, 0, 6, 2 },        /* R */
-            { 0, 1, 0, 3, 3 },        /* G */
-            { 0, 1, 0, 0, 3 },        /* B */
+            { 0, 1, 0, 5, 3 },        /* R */
+            { 0, 1, 0, 2, 3 },        /* G */
+            { 0, 1, 0, 0, 2 },        /* B */
         },
         .flags = AV_PIX_FMT_FLAG_RGB,
     },

libavutil/pixfmt.h

@@ -83,7 +83,7 @@ enum AVPixelFormat {
     AV_PIX_FMT_BGR8,      ///< packed RGB 3:3:2,  8bpp, (msb)2B 3G 3R(lsb)
     AV_PIX_FMT_BGR4,      ///< packed RGB 1:2:1 bitstream,  4bpp, (msb)1B 2G 1R(lsb), a byte contains two pixels, the first pixel in the byte is the one composed by the 4 msb bits
     AV_PIX_FMT_BGR4_BYTE, ///< packed RGB 1:2:1,  8bpp, (msb)1B 2G 1R(lsb)
-    AV_PIX_FMT_RGB8,      ///< packed RGB 3:3:2,  8bpp, (msb)2R 3G 3B(lsb)
+    AV_PIX_FMT_RGB8,      ///< packed RGB 3:3:2,  8bpp, (msb)3R 3G 2B(lsb)
     AV_PIX_FMT_RGB4,      ///< packed RGB 1:2:1 bitstream,  4bpp, (msb)1R 2G 1B(lsb), a byte contains two pixels, the first pixel in the byte is the one composed by the 4 msb bits
     AV_PIX_FMT_RGB4_BYTE, ///< packed RGB 1:2:1,  8bpp, (msb)1R 2G 1B(lsb)
     AV_PIX_FMT_NV12,      ///< planar YUV 4:2:0, 12bpp, 1 plane for Y and 1 plane for the UV components, which are interleaved (first byte U and the following byte V)