webkit-268153

https://bugs.webkit.org/show_bug.cgi?id=268153

Running

go run main.go

The query params are:

• p_lang: primary audio's language
• p_auto: primary audio's AUTOSELECT value
• p_default: primary audio's DEFAULT value
• ad_lang: audio description's language
• ad_auto: audio description's AUTOSELECT value
• ad_default: audio description's DEFAULT value

curl 'http://localhost:9999/playlist.m3u8?p_lang=it&p_auto=YES&ad_lang=en&ad_auto=NO'

Generated the playlists with:

ffmpeg -i video.mp4 -c copy -hls_segment_type fmp4 -hls_list_size 0 -hls_time 6 -hls_fmp4_init_filename "v_init.mp4" v_index.m3u8

ffmpeg -i audio.mp4 -c copy -hls_segment_type fmp4 -hls_list_size 0 -hls_time 6 -hls_fmp4_init_filename "a_init.mp4" a_index.m3u8

ffmpeg -i audio_ad.mp4 -c copy -hls_segment_type fmp4 -hls_list_size 0 -hls_time 6 -hls_fmp4_init_filename "ad_init.mp4" ad_index.m3u8

Specs

https://datatracker.ietf.org/doc/html/draft-pantos-hls-rfc8216bis

DEFAULT
The value is an enumerated-string; valid strings are YES and NO. If the value is YES, then the client SHOULD play this Rendition of the content in the absence of information from the user indicating a different choice.
This attribute is OPTIONAL. Its absence indicates an implicit value of NO.

AUTOSELECT
The value is an enumerated-string; valid strings are YES and NO. This attribute is OPTIONAL. Its absence indicates an implicit value of NO. If the value is YES, then the client MAY choose to play this Rendition in the absence of explicit user preference because it matches the current playback environment, such as chosen system language.
If the AUTOSELECT attribute is present, its value MUST be YES if the value of the DEFAULT attribute is YES.

Test Results

System locale set to "en". AD has CHARACTERISTICS="public.accessibility.describes-video"

Primary: No tags
AD: No tags
Actual: Primary
Expected: Primary

Primary: No tags
AD: language="en"
Actual: AD
Expected: AD

Primary: language="en"
AD: language="en"
Actual: Primary
Expected: Primary

Primary: language="it"
AD: language="en"
Actual: AD
Expected: AD

Primary: language="it", AUTOSELECT=YES
AD: language="en"
Actual: AD
Expected: Primary

Primary: language="it", AUTOSELECT=YES
AD: language="en", AUTOSELECT=NO
Actual: AD
Expected: Primary

Primary: language="it", AUTOSELECT=YES, DEFAULT=YES
AD: language="en", AUTOSELECT=NO
Actual: AD
Expected: Primary

Primary: language="en", AUTOSELECT=YES
AD: language="en", AUTOSELECT=NO
Actual: Primary
Expected: Primary

Primary: language="en", AUTOSELECT=NO
AD: language="en", AUTOSELECT=YES
Actual: Primary
Expected: AD