if (lost)
opus_decoder_ctl(dec, OPUS_GET_LAST_PACKET_DURATION(&output_samples));
else
output_samples =3D max_frame_size;
But FEC is performed when lost_prev =3D=3D 1 (not when lost =3D=3D 1), this
means that the following call to opus_decode (that decodes FEC) will have
output_samples =3D=3D max_frame_size.
I suggest to change the code above to: (only the first line is changed)
if ((!use_inbandfec && lost) || (use_inbandfec && lost_prev))
opus_decoder_ctl(dec, OPUS_GET_LAST_PACKET_DURATION(&output_samples));
else
output_samples =3D max_frame_size;
This should work with and without FEC.
This has been tested with libopus 1.0.2, but I think the bug is still there in
git HEAD.
Thanks,
Gustaf Ullberg
--_000_59F240892E54454ABE5A9F29A2DD230CBE7761DB3EX14MBXC304eur_
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<p class=3D"MsoNormal"><span
lang=3D"EN-US">Hi,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span
lang=3D"EN-US"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">When
running opus_demo with FEC enabled, there is a bug related to the length of FEC
frames. The FEC frames will be decoded with a length of max_frame_size and the
resulting output file will be much longer than the input
file.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span
lang=3D"EN-US"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">From
opus_demo.c:<o:p></o:p></span></p>
<p class=3D"MsoNormal"
style=3D"text-autospace:none"><span lang=3D"EN-US"
style=3D"font-size:7.5pt;font-family:Consolas;color:blue;background:white;mso-highlight:white">if</span><span
lang=3D"EN-US"
style=3D"font-size:7.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">
(lost)<o:p></o:p></span></p>
<p class=3D"MsoNormal"
style=3D"text-autospace:none"><span lang=3D"EN-US"
style=3D"font-size:7.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">
opus_decoder_ctl(dec,
</span><span lang=3D"EN-US"
style=3D"font-size:7.5pt;font-family:Consolas;color:#6F008A;background:white;mso-highlight:white">OPUS_GET_LAST_PACKET_DURATION</span><span
lang=3D"EN-US"
style=3D"font-size:7.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">(&output_samples));<o:p></o:p></span></p>
<p class=3D"MsoNormal"
style=3D"text-autospace:none"><span
style=3D"font-size:7.5pt;font-family:Consolas;color:blue;background:white;mso-highlight:white">else</span><span
style=3D"font-size:7.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-size:7.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">
output_samples =3D max_frame_size;</span><span lang=3D"EN-US"
style=3D"font-size:7.5pt;font-family:Consolas;color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-size:7.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">But
FEC is performed when lost_prev =3D=3D 1 (not when lost =3D=3D 1), this means
that the following call to opus_decode (that decodes FEC) will have
output_samples =3D=3D
max_frame_size.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span
lang=3D"EN-US"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I
suggest to change the code above to: (only the first line is
changed)<o:p></o:p></span></p>
<p class=3D"MsoNormal"
style=3D"text-autospace:none"><span lang=3D"EN-US"
style=3D"font-size:7.5pt;font-family:Consolas;color:blue;background:white;mso-highlight:white">if</span><span
lang=3D"EN-US"
style=3D"font-size:7.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">
((!use_inbandfec && lost) || (use_inbandfec &&
lost_prev))<o:p></o:p></span></p>
<p class=3D"MsoNormal"
style=3D"text-autospace:none"><span lang=3D"EN-US"
style=3D"font-size:7.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">
opus_decoder_ctl(dec,
</span><span lang=3D"EN-US"
style=3D"font-size:7.5pt;font-family:Consolas;color:#6F008A;background:white;mso-highlight:white">OPUS_GET_LAST_PACKET_DURATION</span><span
lang=3D"EN-US"
style=3D"font-size:7.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">(&output_samples));<o:p></o:p></span></p>
<p class=3D"MsoNormal"
style=3D"text-autospace:none"><span
style=3D"font-size:7.5pt;font-family:Consolas;color:blue;background:white;mso-highlight:white">else</span><span
style=3D"font-size:7.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-size:7.5pt;font-family:Consolas;color:black;background:white;mso-highlight:white">
output_samples =3D max_frame_size;</span><span lang=3D"EN-US"
style=3D"font-size:7.5pt;font-family:Consolas;color:black"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"
style=3D"font-size:7.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">This
should work with and without FEC.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span
lang=3D"EN-US"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">This
has been tested with libopus 1.0.2, but I think the bug is still there in git
HEAD.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span
lang=3D"EN-US"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span
lang=3D"EN-US">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span
lang=3D"EN-US">Gustaf
Ullberg<o:p></o:p></span></p>
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--_000_59F240892E54454ABE5A9F29A2DD230CBE7761DB3EX14MBXC304eur_--