dash-mpd 0.20.2

Parse, serialize, download an MPD manifest for MPEG-DASH or WebM-DASH media streaming
Documentation 
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// Tests for language preferences in download support
//
// To run tests while enabling printing to stdout/stderr
//
//    cargo test --test language -- --show-output
//

pub mod common;
use std::fs;
use std::env;
use ffprobe::ffprobe;
use file_format::FileFormat;
use pretty_assertions::assert_eq;
use dash_mpd::fetch::DashDownloader;
use common::{check_file_size_approx, check_media_duration, setup_logging};



#[tokio::test]
async fn test_lang_prefer_spa() {
    setup_logging();
    if env::var("CI").is_ok() {
        return;
    }
    let mpd_url = "https://refapp.hbbtv.org/videos/02_gran_dillama_1080p_ma_25f75g6sv5/manifest.mpd";
    let out = env::temp_dir().join("dillama-spa.mp4");
    if out.exists() {
        let _ = fs::remove_file(&out);
    }
    DashDownloader::new(mpd_url)
        .worst_quality()
        .sandbox(true)
        .max_error_count(5)
        .record_metainformation(true)
        .prefer_language(String::from("spa"))
        .download_to(&out).await
        .unwrap();
    check_file_size_approx(&out, 11_809_117);
    let format = FileFormat::from_file(&out).unwrap();
    assert_eq!(format, FileFormat::Mpeg4Part14Video);
    let meta = ffprobe(&out).unwrap();
    assert_eq!(meta.streams.len(), 2);
    let stream = &meta.streams[1];
    assert_eq!(stream.codec_type, Some(String::from("audio")));
    assert_eq!(stream.codec_name, Some(String::from("aac")));
    let tags = stream.tags.as_ref().unwrap();
    assert_eq!(tags.language, Some(String::from("spa")));
    let _ = fs::remove_file(out);
}


// This test uses prefer_audio_language() instead of prefer_language()
#[tokio::test]
async fn test_lang_prefer_chi() {
    setup_logging();
    if env::var("CI").is_ok() {
        return;
    }
    let mpd_url = "https://refapp.hbbtv.org/videos/02_gran_dillama_1080p_ma_25f75g6sv5/manifest.mpd";
    let out = env::temp_dir().join("dillama-chi.mp4");
    if out.exists() {
        let _ = fs::remove_file(&out);
    }
    DashDownloader::new(mpd_url)
        .worst_quality()
        .sandbox(true)
        .max_error_count(5)
        .record_metainformation(true)
        .prefer_audio_language(String::from("chi"))
        .download_to(&out).await
        .unwrap();
    check_file_size_approx(&out, 11_809_117);
    let format = FileFormat::from_file(&out).unwrap();
    assert_eq!(format, FileFormat::Mpeg4Part14Video);
    let meta = ffprobe(&out).unwrap();
    assert_eq!(meta.streams.len(), 2);
    let stream = &meta.streams[1];
    assert_eq!(stream.codec_type, Some(String::from("audio")));
    assert_eq!(stream.codec_name, Some(String::from("aac")));
    let tags = stream.tags.as_ref().unwrap();
    assert_eq!(tags.language, Some(String::from("chi")));
    let _ = fs::remove_file(out);
}


#[tokio::test]
async fn test_subtitle_lang_stpp_im1t() {
    setup_logging();
    if env::var("CI").is_ok() {
        return;
    }
    let mpd = "http://rdmedia.bbc.co.uk/testcard/vod/manifests/avc-mobile.mpd";
    let outpath = env::temp_dir().join("im1t-subs.mp4");
    if outpath.exists() {
        let _ = fs::remove_file(&outpath);
    }
    DashDownloader::new(mpd)
        .fetch_audio(true)
        .fetch_video(true)
        .fetch_subtitles(true)
        .prefer_language(String::from("fra"))
        .verbosity(2)
        .sandbox(true)
        .download_to(&outpath).await
        .unwrap();
    let meta = ffprobe(&outpath).unwrap();
    assert_eq!(meta.streams.len(), 3);
    let audio = &meta.streams[1];
    assert_eq!(audio.codec_type, Some(String::from("audio")));
    assert_eq!(audio.codec_name, Some(String::from("aac")));
    let tags = audio.tags.as_ref().unwrap();
    assert_eq!(tags.language, Some(String::from("fra")));
    let stpp = &meta.streams[2];
    assert_eq!(stpp.codec_tag_string, "stpp");
    let subtags = stpp.tags.as_ref().unwrap();
    assert_eq!(subtags.language, Some(String::from("fra")));
    check_media_duration(&outpath, 3600.0);
    let _ = fs::remove_file(outpath);
}


// Test behaviour when prefer_subtitle_language() is different from prefer_audio_language()
#[tokio::test]
async fn test_subtitle_lang_different() {
    setup_logging();
    if env::var("CI").is_ok() {
        return;
    }
    let mpd = "http://rdmedia.bbc.co.uk/testcard/vod/manifests/avc-mobile.mpd";
    let outpath = env::temp_dir().join("subs-prefer-lang.mp4");
    if outpath.exists() {
        let _ = fs::remove_file(&outpath);
    }
    DashDownloader::new(mpd)
        .fetch_audio(true)
        .fetch_video(true)
        .fetch_subtitles(true)
        .prefer_audio_language(String::from("fra"))
        .prefer_subtitle_language(String::from("deu"))
        .verbosity(1)
        .sandbox(true)
        .download_to(&outpath).await
        .unwrap();
    let meta = ffprobe(&outpath).unwrap();
    assert_eq!(meta.streams.len(), 3);
    let audio = meta.streams.iter()
        .find(|s| s.codec_type.eq(&Some(String::from("audio"))))
        .expect("finding audio stream");
    assert_eq!(audio.codec_type, Some(String::from("audio")));
    assert_eq!(audio.codec_name, Some(String::from("aac")));
    let tags = audio.tags.as_ref().unwrap();
    assert_eq!(tags.language, Some(String::from("fra")));
    let subs = meta.streams.iter()
        .find(|s| s.codec_type.eq(&Some(String::from("subtitle"))))
        .expect("finding embedded subtitle track");
    assert_eq!(subs.codec_tag_string, "stpp");
    let subtags = subs.tags.as_ref().unwrap();
    assert_eq!(subtags.language, Some(String::from("deu")));
    check_media_duration(&outpath, 3600.0);
    let _ = fs::remove_file(outpath);
}


// This manifest contains 3 audio streams. Ask for the en-low audio track (which has a lower
// bitrate) and check that the resulting file size is plausible.
#[tokio::test]
async fn test_lang_en_multilang() {
    setup_logging();
    if env::var("CI").is_ok() {
        return;
    }
    // let mpd_url = "https://bitmovin-a.akamaihd.net/content/sintel/sintel.mpd";
    let mpd_url = "https://media.axprod.net/TestVectors/Cmaf/clear_1080p_h264/manifest.mpd";
    let tmpd = tempfile::tempdir().unwrap();
    let out = tmpd.path().join("axprod-multilang.mp4");
    DashDownloader::new(mpd_url)
        .worst_quality()
        .sandbox(true)
        .without_content_type_checks()
        .prefer_language(String::from("en-low"))
        .audio_only()
        .download_to(&out).await
        .unwrap();
    check_file_size_approx(&out, 12_036_135);
    let format = FileFormat::from_file(&out).unwrap();
    assert_eq!(format, FileFormat::Mpeg4Part14Audio);
    let meta = ffprobe(&out).unwrap();
    assert_eq!(meta.streams.len(), 1);
    let audio = meta.streams.iter()
        .find(|s| s.codec_type.eq(&Some(String::from("audio"))))
        .expect("finding audio stream");
    assert_eq!(audio.codec_name, Some(String::from("aac")));
    let entries = fs::read_dir(tmpd.path()).unwrap();
    let count = entries.count();
    assert_eq!(count, 1, "Expecting a single output file, got {count}");
    let _ = fs::remove_dir_all(tmpd);
}