[opus] [PATCH] Support for Ambisonics

Jean-Marc Valin jmvalin at jmvalin.ca
Mon Mar 19 21:05:42 UTC 2018

Hi Drew,

I think the libopusenc patch is better, but there's still a few issues left:
1) The static MAX_PACKET_BUFFER_SIZE value is still problematic because
if you link libopusenc with a new version of libopus that supports
higher order projection or just more projection channels for order 3,
then you will overflow the buffer. I think what you'd want is a
_ope_opus_header_get_size() call that would return how large the header
*actually* is. Then you can use that value instead of
MAX_PACKET_BUFFER_SIZE in init_stream()
2) I think the remaining if()s in ope_encoder_ctl() can also be removed
by adding another ctl() macro (like _oge_ctl()) with an extra argument.
simply use _oge_ctl(enc->st,
3) On libopus itself, why "#define OPUS_HAVE_OPUS_PROJECTION_H 9000"
instead of just "#define OPUS_HAVE_OPUS_PROJECTION_H"?



On 03/19/2018 02:53 PM, Drew Allen wrote:
> On Mon, Mar 19, 2018 at 11:52 AM Drew Allen <bitllama at google.com
> <mailto:bitllama at google.com>> wrote:
>     Hello all,
>     Sorry for the delay (got really sick last week).
>     Attached are updated patches for libopus, libopusenc, opusfile and
>     opus-tools.
>     Note that the patches for libopusenc, opusfile and opus-tools are
>     dependent on the patch for libopus.
>     Please let me know if you have any additional followup comments or
>     questions.
>     Cheers,
>     Drew
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