[FFmpeg-devel] [PATCH] FFV1 specification: Quantization Tables syntax

[Jerome Martinez]

Quantization Tables syntax was not defined.
Corresponding HTML export: 
https://mediaarea.net/temp/ffv1-patched-Quantization-tables-syntax.html#toc-Subsection-4.4 

-------------- next part --------------
From 7d58498adbc04aeabc5497df0270c6ebd1cfac12 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Martinez?= <jerome at mediaarea.net>
Date: Wed, 29 Apr 2015 21:54:13 +0200
Subject: [PATCH] Quantization tables syntax.

More details is provided about how to read quantization tables and the associated values (context_count).
---
 ffv1.lyx | 1006 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 1002 insertions(+), 4 deletions(-)

diff --git a/ffv1.lyx b/ffv1.lyx
index 3d2380c..22c4a93 100644
--- a/ffv1.lyx
+++ b/ffv1.lyx
@@ -5246,7 +5246,7 @@ br
 \begin_inset space ~
 \end_inset
 
-QuantizationTables
+QuantizationTable(0)
 \end_layout
 
 \end_inset
@@ -5966,7 +5966,7 @@ for(i=0; i<quant_table_count; i++)
 \begin_inset space ~
 \end_inset
 
-QuantizationTables
+QuantizationTable(i)
 \end_layout
 
 \end_inset
@@ -6170,7 +6170,7 @@ if(states_coded)
 \begin_inset space ~
 \end_inset
 
-for(j=0; j<context_count;j++)
+for(j=0; j<context_count[i];j++)
 \end_layout
 
 \end_inset
@@ -7906,7 +7906,7 @@ crc_parity 32bit that are choosen so that the global header as a whole or
 \end_layout
 
 \begin_layout Subsection
-Quant Table
+Quantization Tables
 \end_layout
 
 \begin_layout Standard
@@ -7933,6 +7933,1004 @@ Table: 0 0 1 1 1 1 2 2-2-2-2-1-1-1-1 0
 \end_inset
 
 Stored values: 1, 3, 1
+\begin_inset Newline newline
+\end_inset
+
+
+\end_layout
+
+\begin_layout Standard
+\begin_inset Tabular
+<lyxtabular version="3" rows="8" columns="2">
+<features rotate="0" tabularvalignment="middle">
+<column alignment="left" valignment="top">
+<column alignment="center" valignment="top">
+<row>
+<cell alignment="left" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+QuantizationTable (i) {
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+type
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+scale=1
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="left" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+for(j=0; j<MAX_CONTEXT_INPUTS; j++) {
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="left" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+QuantizationTablePerContext(i, j, scale)
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+scale*=2*len_count[i][j]-1
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="left" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+}
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+context_count[i]=(scale+1)/2
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="left" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+}
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" bottomline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\end_layout
+
+\end_inset
+</cell>
+</row>
+</lyxtabular>
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Standard
+MAX_CONTEXT_INPUTS is 5.
+\end_layout
+
+\begin_layout Standard
+\begin_inset Tabular
+<lyxtabular version="3" rows="16" columns="2">
+<features rotate="0" tabularvalignment="middle">
+<column alignment="left" valignment="top">
+<column alignment="center" valignment="top">
+<row>
+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+QuantizationTablePerContext (i, j, scale) {
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+type
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+v=0
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+for(k= 0; k<128;) {
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+len-1
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+sr
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+for(a=0; a<len; a++) {
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+quant_tables[i][j][k]=scale*v
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+k++
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+}
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+v++
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+}
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+for (k=1; k<128; k++) {
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+quant_tables[i][j][256-k]=-quant_tables[i][j][k]
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+}
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+quant_tables[i][j][128]=-quant_tables[i][j][127]
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+
+\begin_inset space ~
+\end_inset
+
+len_count[i][j]=v
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\end_layout
+
+\end_inset
+</cell>
+</row>
+<row>
+<cell alignment="center" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+}
+\end_layout
+
+\end_inset
+</cell>
+<cell alignment="center" valignment="top" topline="true" bottomline="true" leftline="true" rightline="true" usebox="none">
+\begin_inset Text
+
+\begin_layout Plain Layout
+
+\end_layout
+
+\end_inset
+</cell>
+</row>
+</lyxtabular>
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Description
+quant_tables indicates the quantification table values.
+\end_layout
+
+\begin_layout Description
+context_count indicates the count of contexts.
 \end_layout
 
 \begin_layout Subsection
-- 
1.9.5.msysgit.1