#        -*- Dockerfile -*-
#
# Recipe to build a container image for dash-mpd-cli + helper applications, for Linux/arm/v7.
#
# This Containerfile contains the recipe needed to generate a docker/podman/OCI container image
# including the dash-mpd-cli binary alongside the external helper applications that it uses for
# muxing media streams, for extracting/converting subtitle streams, and for decrypting content
# infected with DRM. These are packaged with a minimal Alpine Linux installation.
#
# To build the container locally (not needed for an end user)
#
#   podman manifest create dash-mpd-cli
#   podman build -f etc/Containerfile_linux_armv7 --platform linux/arm/v7 --tag dash-mpd-cli-linux-armv7 --manifest dash-mpd-cli .


# static build of MP4Box from GPAC, which is not packaged for Alpine Linux.
# https://github.com/gpac/gpac/wiki/GPAC-Build-Guide-for-Linux
FROM --platform=linux/arm/v7 docker.io/alpine:latest AS builder
WORKDIR /src
COPY ./ ./
RUN apk update && \
    apk upgrade && \
    apk add --no-cache curl file musl-dev pkgconfig git g++ binutils rust cargo \
       make cmake sed zlib-dev zlib-static ninja python3 linux-headers zlib-dev zlib-static protoc && \
    cargo update && \
    cargo build --release && \
    # shaka-packager needs a few tweaks to build from source. We see C compiler errors when building
    # with a build type of Release. The official Dockerfile is building with BUILD_TYPE of Debug...
    # We work around a C compiler error when building the c-ares third party library, which doesn't
    # build due to -Werror=shift-count-overflow errors from -Werr. We need to modify CMakeLists.txt
    # to remove the -Werror and add a definition for _LARGEFILE64_SOURCE which is needed while
    # compiling the abseil-cpp dependency.
    cd /src && git clone --depth 1 --recurse-submodules https://github.com/shaka-project/shaka-packager.git && \
    cd shaka-packager && \
    sed --in-place 's/^.*add_compile_options.*Werror.*/  add_compile_definitions(_LARGEFILE64_SOURCE)/' packager/CMakeLists.txt && \
    cmake -S . -B build -G Ninja -DCMAKE_BUILD_TYPE=Debug && \
    cmake --build build/ && \
    ls -l build/packager && \
    file build/packager/packager && \
    cd /src && git clone --depth 1 https://github.com/gpac/gpac.git && \
    cd gpac && ./configure --static-bin && \
    make -j 4 && \
    ls -l bin/gcc/ && \
    file bin/gcc/MP4Box


# Now build the final image
FROM --platform=linux/arm/v7 docker.io/alpine:latest
LABEL org.opencontainers.image.description "Download media content from a DASH-MPEG or DASH-WebM MPD manifest."
LABEL org.opencontainers.image.title "dash-mpd-cli"
LABEL org.opencontainers.image.url "https://github.com/emarsden/dash-mpd-cli"
LABEL org.opencontainers.image.source "https://github.com/emarsden/dash-mpd-cli"
LABEL org.opencontainers.image.version "0.2.23"
LABEL org.opencontainers.image.authors "eric.marsden@risk-engineering.org"
LABEL org.opencontainers.image.licenses "MIT"

# Install our external dependencies. Licences for the external dependencies:
#   - ffmpeg: GNU GPL v2
#   - mkvmerge (from mkvtoolnix): GNU GPL v2
#   - vlc: GNU GPL v2, not installed because it inflates image size considerably
#   - mp4decrypt (from bento4): GNU GPL v2
#   - xsltproc (from libxslt): MIT
#   - Shaka packager: MIT
#
# We can't install shaka-packager from the docker.io/google/shaka-packager image, because it's only
# built for AMD64.
RUN apk update && \
    apk upgrade && \
    apk add --no-cache ca-certificates libc6-compat wget ffmpeg mkvtoolnix bento4 libxslt && \
    update-ca-certificates && \
    mkdir /content && \
    chown root:root /content && \
    chmod a=rwx,o+t /content

COPY --from=builder --chown=root:root --chmod=755 \
    /src/target/release/dash-mpd-cli /usr/local/bin
COPY --from=builder --chown=root:root --chmod=755 \
    /src/gpac/bin/gcc/MP4Box /usr/local/bin
COPY --from=builder --chown=root:root --chmod=755 \
    /src/shaka-packager/build/packager/packager /usr/local/bin/shaka-packager

WORKDIR /content
ENV TERM=xterm-256color
ENTRYPOINT ["/usr/local/bin/dash-mpd-cli"]

# Size of our container image:
#   with vlc:     331 MB
#   without vlc:  238 MB  (arm/v7)