vrecord/cchex_to_display at main · MediaArea/vrecord · GitHub

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#!/usr/bin/env bash
# cc_to_srt_safe.sh
# Convert EIA-608 hex dump to readable text (simplified version)
bash --version
INPUT_FILE="$1"
OUTPUT_FILE="$2"
OUTPUT_FILE_TMP="${OUTPUT_FILE}.tmp"

if [[ -z "$INPUT_FILE" || -z "$OUTPUT_FILE" ]]; then
    echo "Usage: $0 <input_file> <output_file>"
    exit 1
fi

declare -A char_map=(
    ["20"]=" "
    ["A1"]="!"
    ["A2"]="\""
    ["23"]="#"
    ["A4"]="$"
    ["25"]="%"
    ["26"]="&"
    ["A7"]="'"
    ["A8"]="("
    ["29"]=")"
    ["2A"]="á"
    ["AB"]="+"
    ["2C"]=","
    ["AD"]="-"
    ["AE"]="."
    ["2F"]="/"
    ["B0"]="0"
    ["31"]="1"
    ["32"]="2"
    ["B3"]="3"
    ["34"]="4"
    ["B5"]="5"
    ["B6"]="6"
    ["37"]="7"
    ["38"]="8"
    ["B9"]="9"
    ["BA"]=":"
    ["3B"]=";"
    ["BC"]="<"
    ["3D"]="="
    ["3E"]=">"
    ["BF"]="?"
    ["40"]="@"
    ["C1"]="A"
    ["C2"]="B"
    ["43"]="C"
    ["C4"]="D"
    ["45"]="E"
    ["46"]="F"
    ["C7"]="G"
    ["C8"]="H"
    ["49"]="I"
    ["4A"]="J"
    ["CB"]="K"
    ["4C"]="L"
    ["CD"]="M"
    ["CE"]="N"
    ["4F"]="O"
    ["D0"]="P"
    ["51"]="Q"
    ["52"]="R"
    ["D3"]="S"
    ["54"]="T"
    ["D5"]="U"
    ["D6"]="V"
    ["57"]="W"
    ["58"]="X"
    ["D9"]="Y"
    ["DA"]="Z"
    ["5B"]="["
    ["DC"]="é"
    ["5D"]="]"
    ["5E"]="í"
    ["DF"]="ó"
    ["E0"]="ú"
    ["61"]="a"
    ["62"]="b"
    ["E3"]="c"
    ["64"]="d"
    ["E5"]="e"
    ["E6"]="f"
    ["67"]="g"
    ["68"]="h"
    ["E9"]="i"
    ["EA"]="j"
    ["6B"]="k"
    ["EC"]="l"
    ["6D"]="m"
    ["6E"]="n"
    ["EF"]="o"
    ["70"]="p"
    ["F1"]="q"
    ["F2"]="r"
    ["73"]="s"
    ["F4"]="t"
    ["75"]="u"
    ["76"]="v"
    ["F7"]="w"
    ["F8"]="x"
    ["79"]="y"
    ["7A"]="z"
    ["FB"]="ç"
    ["7C"]="÷"
    ["FD"]="Ñ"
    ["FE"]="ñ"
    ["7F"]=" "
)

# --- Fast lookup ---
lookup() {
    local key="$1"
    echo -n "${char_map[$key]}"
}

unset START_FRAME
# --- Start buffer to hold last 30 chars ---
TAIL_SCAN="60"
CAPTION_LINE_LENGTH="64"
BUFFER="$(printf "%*s" "${CAPTION_LINE_LENGTH}" "")"
if [[ ! -f "${OUTPUT_FILE}" ]] ; then
    echo -n "${BUFFER}" > "${OUTPUT_FILE_TMP}"
    mv "${OUTPUT_FILE_TMP}" "${OUTPUT_FILE}"
fi
while true ; do
    LAST_METADATA="$(tail -n "${TAIL_SCAN}" "${INPUT_FILE}")"
    if [[ -z "$START_FRAME" ]] ; then
        METADATA_TO_PROCESS="${LAST_METADATA}"
    else
        METADATA_TO_PROCESS="$(echo "${LAST_METADATA}" | grep -A "${TAIL_SCAN}" "frame:${START_FRAME} ")"
    fi
    START_FRAME="$(echo "${LAST_METADATA}" | grep -o 'frame:[0-9]*' | tail -n1 | cut -d: -f2)"
    NEW_CCS="$(echo "${METADATA_TO_PROCESS}" | grep "lavfi.readeia608.0.cc=" | cut -d "=" -f2)"
    ((START_FRAME++))
    while IFS= read -r CC_HEX ; do
        CC_HEX="${CC_HEX//0x}"
        if [[ "${CC_HEX}" != "8080" && -n "${CC_HEX}" ]] ; then
            CC1="$(lookup "${CC_HEX:0:2}")"
        else
            unset CC1
        fi
        if [[ -n "${CC1}" ]] ; then
            CC2="$(lookup "${CC_HEX:2:2}")"
            BUFFER+="${CC1}${CC2}"
            BUFFER="${BUFFER: -${CAPTION_LINE_LENGTH}}"
            echo -n "${BUFFER}" > "${OUTPUT_FILE_TMP}"
            mv "${OUTPUT_FILE_TMP}" "${OUTPUT_FILE}"
        else
            BUFFER+=" "
            if [[ -z "${BUFFER: -${CAPTION_LINE_LENGTH}}" ]] ; then
                BUFFER="$(printf "%*s" "${CAPTION_LINE_LENGTH}" "")"
            else
                BUFFER="${BUFFER: -${CAPTION_LINE_LENGTH}}"
                if [[ -n "${BUFFER// }" || "${CLEAR}" == "1" ]] ; then
                    echo -n "${BUFFER}" > "${OUTPUT_FILE_TMP}"
                    mv "${OUTPUT_FILE_TMP}" "${OUTPUT_FILE}"
                    CLEAR="0"
                else
                    CLEAR="1"
                fi
            fi
        fi
        echo "BUFFER=(${BUFFER}) CC1=${CC1} CC2=${CC2}"
        unset CC1 CC2
    done <<< "${NEW_CCS}"
    sleep 0.2
done