#!/bin/sh
 
 # Copyright (c) 2011 Nicolas George
 #
 # This file is part of FFmpeg.
 #
 # FFmpeg is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
 # License as published by the Free Software Foundation; either
 # version 2.1 of the License, or (at your option) any later version.
 #
 # FFmpeg is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 # Lesser General Public License for more details.
 #
 # You should have received a copy of the GNU Lesser General Public
 # License along with FFmpeg; if not, write to the Free Software Foundation,
 # Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 
 set -e
 
 config="$1"

 out="$2"

 test -n "$out"
 
 outval=""
 
 add_line () {
   outval="$outval$*
 "
 }
 
 parse_config_h () {
   while read define var value; do
     case "$define $var $value" in
       "#define CONFIG_"*_*" 1") eval "$var=1";;
     esac
   done
 }
 
 define_codecid () {
   id="$1"
   n=${1#CODEC_ID_}
   add_line "case ${id}:"
   eval "c=\${CONFIG_${n}_DECODER}:\${CONFIG_${n}_ENCODER}"
   case "$c" in
     1:*) s="decoder";;
     *:1) s="encoder";;
     *) s="";;
   esac
   case "$s" in
     "") add_line "    return \"$n\";" ;;
     *)
       add_line "    { extern AVCodec ff_${n}_${s};"
       add_line "      return ff_${n}_${s}.name; }"
       ;;
   esac
 }
 
 parse_enum_codecid () {
   while read line; do
     case "$line" in
       "};") break;;

       *CODEC_ID_FIRST*=*) ;;

       CODEC_ID_*) define_codecid ${line%%[=,]*};;
     esac
   done
 }
 
 parse_avcodec_h () {
   while read line; do
     case "$line" in
       "enum CodecID {") parse_enum_codecid; break;;
     esac
   done
 }
 
 parse_config_h  < "$config"

 parse_avcodec_h # use stdin

 sed -e '/case.*:/!y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/' \

     -e 's/extern avcodec /extern AVCodec /' > "$out" <<EOF
 $outval
 EOF