udp: Support IGMPv3 source specific multicast and source blocking

[ffmpeg] / doc / snow.txt

diff --git a/doc/snow.txt b/doc/snow.txt
index 91e4780fe961d45a7170e62bdea01cf403de43ff..f99133971c370d3c3a7470dfe2c9d3f33a9b0bfc 100644 (file)
--- a/doc/snow.txt
+++ b/doc/snow.txt
@@ -1,17 +1,18 @@
 =============================================
-SNOW Video Codec Specification Draft 20070103
+Snow Video Codec Specification Draft 20080110
 =============================================
 
-Intro:
-======
-This Specification describes the snow syntax and semmantics as well as
-how to decode snow.
-The decoding process is precissely described and any compliant decoder
-MUST produce the exactly same output for a spec conformant snow stream.
-For encoding though any process which generates a stream compliant to
-the syntactical and semmantical requirements and which is decodeable by
+Introduction:
+=============
+This specification describes the Snow bitstream syntax and semantics as
+well as the formal Snow decoding process.
+
+The decoding process is described precisely and any compliant decoder
+MUST produce the exact same output for a spec-conformant Snow stream.
+For encoding, though, any process which generates a stream compliant to
+the syntactical and semantic requirements and which is decodable by
 the process described in this spec shall be considered a conformant
-snow encoder.
+Snow encoder.
 
 Definitions:
 ============
@@ -314,13 +315,13 @@ Binary Range Coder:
 The implemented range coder is an adapted version based upon "Range encoding:
 an algorithm for removing redundancy from a digitised message." by G. N. N.
 Martin.
-The symbols encoded by the snow range coder are bits (0|1). The
+The symbols encoded by the Snow range coder are bits (0|1). The
 associated probabilities are not fix but change depending on the symbol mix
 seen so far.
 
 
 bit seen | new state
----------+--------------------------------------------
+---------+-----------------------------------------------
     0    | 256 - state_transition_table[256 - old_state];
     1    |       state_transition_table[      old_state];
 
@@ -346,7 +347,7 @@ FIXME
 
 
 Range Coding of integers:
---------------------------
+-------------------------
 FIXME
 
 
@@ -485,7 +486,7 @@ the remaining points shall be bilinearly interpolated from the
 up to 4 surrounding halfpel and fullpel points, again rounding should be to
 nearest and halfway values rounded up
 
-compliant snow decoders MUST support 1-1/8 pel luma and 1/2-1/16 pel chroma
+compliant Snow decoders MUST support 1-1/8 pel luma and 1/2-1/16 pel chroma
 interpolation at least
 
 
@@ -561,7 +562,7 @@ s[w ] shall be considered equivalent to s[w-2]
   |  +  |  +  |  +  |  +   +1/2
 
 
-snows 9/7 Integer filter:
+Snow's 9/7 Integer filter:
 1. s[i] -= (3*(s[i-1] + s[i+1])         + 4)>>3; for all even i < w
 2. s[i] -=     s[i-1] + s[i+1]                 ; for all odd  i < w
 3. s[i] += (   s[i-1] + s[i+1] + 4*s[i] + 8)>>4; for all even i < w