doc: initial nut documentation

doc/Makefile

@@ -7,6 +7,7 @@ HTMLPAGES   = $(PROGS-yes:%=doc/%.html)                                 \
               doc/general.html                                          \
               doc/git-howto.html                                        \
               doc/libavfilter.html                                      \
+              doc/nut.html                                              \
               doc/platform.html                                         \
 
 DOCS = $(HTMLPAGES) $(MANPAGES) $(PODPAGES)

doc/nut.texi

@@ -0,0 +1,128 @@
+\input texinfo @c -*- texinfo -*-
+
+@settitle NUT
+
+@titlepage
+@center @titlefont{NUT}
+@end titlepage
+
+@top
+
+@contents
+
+@chapter Description
+NUT is a low overhead generic container format. It stores audio, video,
+subtitle and user-defined streams in a simple, yet efficient, way.
+
+It was created by a group of FFmpeg and MPlayer developers in 2003
+and was finalized in 2008.
+
+@chapter Container-specific codec tags
+
+@section Generic raw YUVA formats
+
+Since many exotic planar YUVA pixel formats are not considered by
+the AVI/QuickTime FourCC lists, the following scheme is adopted for
+representing them.
+
+The first two bytes can contain the values:
+Y1 = only Y
+Y2 = Y+A
+Y3 = YUV
+Y4 = YUVA
+
+The third byte represents the width and height chroma subsampling
+values for the UV planes, that is the amount to shift the luma
+width/height right to find the chroma width/height.
+
+The fourth byte is the number of bits used (8, 16, ...).
+
+If the order of bytes is inverted, that means that each component has
+to be read big-endian.
+
+@section Raw Audio
+
+@multitable @columnfractions .4 .4
+@item ALAW  @tab A-LAW
+@item ULAW  @tab MU-LAW
+@item P<type><interleaving><bits> @tab little-endian PCM
+@item <bits><interleaving><type>P @tab big-endian PCM
+@end multitable
+
+<type> is S for signed integer, U for unsigned integer, F for IEEE float
+<interleaving> is D for default, as a historical artefact.
+<bits> is 8/16/24/32
+
+@example
+PFD[32]   would for example be signed 32 bit little-endian IEEE float
+@end example
+
+@section Subtitles
+
+@multitable @columnfractions .4 .4
+@item UTF8   @tab Raw UTF-8
+@item SSA[0] @tab SubStation Alpha
+@item DVDS   @tab DVD subtitles
+@item DVBS   @tab DVB subtitles
+@end multitable
+
+@section Codecs
+
+@multitable @columnfractions .4 .4
+@item 3IV1 @tab non-compliant MPEG-4 generated by old 3ivx
+@item ASV1 @tab Asus Video
+@item ASV2 @tab Asus Video 2
+@item CVID @tab Cinepak
+@item CYUV @tab Creative YUV
+@item DIVX @tab non-compliant MPEG-4 generated by old DivX
+@item DUCK @tab Truemotion 1
+@item FFV1 @tab FFmpeg video 1
+@item FFVH @tab FFmpeg Huffyuv
+@item H261 @tab ITU H.261
+@item H262 @tab ITU H.262
+@item H263 @tab ITU H.263
+@item H264 @tab ITU H.264
+@item HFYU @tab Huffyuv
+@item I263 @tab Intel H.263
+@item IV31 @tab Indeo 3.1
+@item IV32 @tab Indeo 3.2
+@item IV50 @tab Indeo 5.0
+@item LJPG @tab ITU JPEG (lossless)
+@item MJLS @tab ITU JPEG-LS
+@item MJPG @tab ITU JPEG
+@item MPG4 @tab MS MPEG-4v1 (not ISO MPEG-4)
+@item MP42 @tab MS MPEG-4v2
+@item MP43 @tab MS MPEG-4v3
+@item MP4V @tab ISO MPEG-4 Part 2 Video (from old encoders)
+@item mpg1 @tab ISO MPEG-1 Video
+@item mpg2 @tab ISO MPEG-2 Video
+@item MRLE @tab MS RLE
+@item MSVC @tab MS Video 1
+@item RT21 @tab Indeo 2.1
+@item RV10 @tab RealVideo 1.0
+@item RV20 @tab RealVideo 2.0
+@item RV30 @tab RealVideo 3.0
+@item RV40 @tab RealVideo 4.0
+@item SNOW @tab FFmpeg Snow
+@item SVQ1 @tab Sorenson Video 1
+@item SVQ3 @tab Sorenson Video 3
+@item theo @tab Xiph Theora
+@item TM20 @tab Truemotion 2.0
+@item UMP4 @tab non-compliant MPEG-4 generated by UB Video MPEG-4
+@item VCR1 @tab ATI VCR1
+@item VP30 @tab VP 3.0
+@item VP31 @tab VP 3.1
+@item VP50 @tab VP 5.0
+@item VP60 @tab VP 6.0
+@item VP61 @tab VP 6.1
+@item VP62 @tab VP 6.2
+@item VP70 @tab VP 7.0
+@item WMV1 @tab MS WMV7
+@item WMV2 @tab MS WMV8
+@item WMV3 @tab MS WMV9
+@item WV1F @tab non-compliant MPEG-4 generated by ?
+@item WVC1 @tab VC-1
+@item XVID @tab non-compliant MPEG-4 generated by old Xvid
+@item XVIX @tab non-compliant MPEG-4 generated by old Xvid with interlacing bug
+@end multitable
+