Hi Hans, this is a lighter version from sound-001.tex from your test samples:
\definerenderingwindow
[example]
[width=0pt,height=0pt,frame=off]
\setupinteraction[state=start]
\useexternalrendering
[mysound]
[audio/x-mp3] % audio/x-mp3
[sound.mp3]
%~ [embed]
\definereference [StartSoundTrack] [StartRendering{mysound}]
\definereference [StopSoundTrack] [StopRendering{mysound}]
\definelayer[resources][width=\paperwidth,height=\paperheight]
\setupbackgrounds[page][background=resources]
\setupbodyfont[100pt]
\starttext\bf\ss
\setlayer[resources]{\placerenderingwindow[example][mysound]}
\startTEXpage
\button{start}[StartSoundTrack]
\button{stop}[StopSoundTrack]
\stopTEXpage
\stoptext
As reported before
(https://mailman.ntg.nl/pipermail/ntg-context/2018/092327.html), sound
is played fine when not embedded. But it won’t play embedded files.
Without embedded sound, the relevant /Filespec reads:
7 0 obj
<<
/F (sound.mp3)
/Type /Filespec
>>
endobj
With an embedded sound, /Filespec and /EmbeddedFile read:
7 0 obj
<<
/Subtype /audio#2Fx-mp3
/Type /EmbeddedFile
/Length 49006
>>
stream
endstream
endobj
8 0 obj
<<
/EF <<
/F 7 0 R
>>
/F (sound.mp3)
/Type /Filespec
/UF (\376\377\000s\000o\000u\000n\000d\000.\000m\000p\0003)
>>
endobj
10 0 obj
<<
/EF 8 0 R
/F (sound.mp3)
/Type /Filespec
>>
endobj
I don’t know why there are two /Filespec objects, since they are duplicated.
In any case, the value for the /EF entry has to be a dictionary that
points to the /EmbeddedFile (such as in object 8).
I’m afraid that the code that generates the second /Filespec object
(object 10 in the code above) is wrong.
I attach a modified file fixing the issue from the PDF document
generated by ConTeXt.
I hope this help to fix the issue.
Many thanks for your help,
Pablo
--
http://www.ousia.tk
embedded-mp3-sound.pdf
Description: Adobe PDF document
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