Texas Instruments DM38x DaVinci, User Manual

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205 SPRUHI7A – December 2012 – Revised June 2016
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High-Definition Video Processing Subsystem (HDVPSS)
1.2.11.2.5.6 Coefficient Table Selection Guide
The scaler filter coefficient tables are pre-generated using a Matlab program for various scaling factor
ranges.
Table 1-71 is a general selection guide table for coefficient data files.
(1)
HS Scaler has two sets of ½-decimator to perform downscaling ratios below ½ and ¼.
Table 1-71. Coefficient Data Files
Scaler Scale Factor Coeff table
HS Polyphase Filter All upscaling ppfcoef_scale_eq_1_32_phases_flip.dat
HS Polyphase Filter
All upscaling ppfcoef_scale_eq_1_32_hases_flip.dat
½ or ¼ down scaling ppfcoef_scale_eq_1_32_phases_flip.dat
> 15/16 ppfcoef_scale_eq_15div16_32_phases_flip.dat
> 14/16 ppfcoef_scale_eq_14div16_32_phases_flip.dat
> 13/16 ppfcoef_scale_eq_13div16_32_phases_flip.dat
> 12/16 ppfcoef_scale_eq_12div16_32_phases_flip.dat
> 11/16 ppfcoef_scale_eq_11div16_32_phases_flip.dat
> 10/16 ppfcoef_scale_eq_10div16_32_phases_flip.dat
> 9/16 ppfcoef_scale_eq_9div16_32_phases_flip.dat
> 8/16 ppfcoef_scale_eq_8div16_32_phases_flip.dat
(1)
VS Polyphase Filter
Upscaling ppfcoef_scale_eq_1_32_phases_ver_5tap_flip.dat
> 15/16 ppfcoef_scale_eq_15div16_32_phases_ver_5tap_flip.dat
> 14/16 ppfcoef_scale_eq_14div16_32_phases_ver_5tap_flip.dat
> 13/16 ppfcoef_scale_eq_13div16_32_phases_ver_5tap_flip.dat
> 12/16 ppfcoef_scale_eq_12div16_32_phases_ver_5tap_flip.dat
> 11/16 ppfcoef_scale_eq_11div16_32_phases_ver_5tap_flip.dat
> 10/16 ppfcoef_scale_eq_10div16_32_phases_ver_5tap_flip.dat
> 9/16 ppfcoef_scale_eq_9div16_32_phases_ver_5tap_flip.dat
> 8/16 ppfcoef_scale_eq_8div16_32_phases_ver_5tap_flip.dat
else For down-scaling <8/16, RAV filter is recommended. In this
case, coefficients for vertical scaling need not be loaded.
The above mentioned .dat files are available in Section 1.2.11.4 .
1.2.11.3 Code
1.2.11.3.1 Generate Coefficient Memory Image
The following Perl script is used to generate a coefficient memory image for a given set of scaling factors.
#!/usr/local/bin/perl
#$dir="coef/"; # directory which contains the coef files
#$cfg_file="sc_config1.cfg"; # configuration file name
#$spl_file="sc_config_supl.cfg"; # supplemental configuration file name $cfg_file=$ARGV[0]; #
configuration file name $spl_file=$ARGV[1]; # supplemental configuration file name
$dir=$ARGV[2]; # directory which contains the coef files
$coef_width=13; # coef bit width
$coef_ntap=7; # coef tap
$coef_nphase=32; # coef phase
$coef_norm=11; # coef norm
#----------------------------------------------------------
# read config file to get srcH/tarH/interlace_i/interlace_o
#----------------------------------------------------------
open(INFILE, "<$cfg_file") or die "### ERROR: Cannot open $cfg_file";