From 56b7655e67528880778696d32f2d3a3e3ff30782 Mon Sep 17 00:00:00 2001
From: Jonas Smedegaard <dr@jones.dk>
Date: Thu, 18 May 2017 11:06:33 +0200
Subject: Generalize function videosize.

---
 bin/stream | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

(limited to 'bin/stream')

diff --git a/bin/stream b/bin/stream
index db1c100..24213d3 100755
--- a/bin/stream
+++ b/bin/stream
@@ -7,6 +7,11 @@ set -eu
 # TODO: Externalize to site-specific configfile
 [ $# -gt 0 ] || set -- morla 5002 -- dvcam ../../content/icon_small.png
 
+##
+## defaults
+##
+RATIO=4:3
+
 ##
 ## generic functions
 ##
@@ -113,8 +118,15 @@ HEIGHT=288
 HEIGHTS_WEBM="$HEIGHT"
 HEIGHTS_MPEG="$HEIGHT"
 
-RATIO_NUM=4
-RATIO_DEN=3
+videosize() { height=$1; width_or_ratio=$2;
+ case $width_or_ratio in
+  *:*) num=${width_or_ratio%:*}; den=${width_or_ratio#*:}; width=$((height*num/den));;
+  *) width=$width_or_ratio;;
+ esac
+ echo_n $((height*width))
+}
+
+BITS=$(videosize "$HEIGHT" "$RATIO")
 
 # * bitrates and bits in parens based on https://developer.apple.com/library/content/documentation/General/Reference/HLSAuthoringSpec/Requirements.html
 #   + bits rounded up to include nearby modulo 16 formats
@@ -122,10 +134,6 @@ RATIO_DEN=3
 #   + best (i.e. high-modulo) 4:3 heights: 288 312 384 480 624 816
 # * speeds tuned to just below 100% cpu usage for each combination on a multi-core computer
 # TODO: Externalize speeds to site-specific configfile
-RATIO_NUM=${RATION_NUM:-16}
-RATIO_DEN=${RATION_DEN:-9}
-WIDTH=${WIDTH:-$((HEIGHT*RATIO_NUM/RATIO_DEN))}
-BITS=$((WIDTH*HEIGHT))
 if [ $BITS -le 110592 ]; then # 234p → 97344
  VBITRATE=145000
  SPEED_X264=fast; SPEED_X264_ALONE=fast
-- 
cgit v1.2.3