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Closes https://github.com/xiph/opus-tools/pull/56

Signed-off-by: Mark Harris <mark.hsj@gmail.com>

In paritcular, the cpuid check is not applcable to Elbrus (e2k).
Reported-by: Michael Shigorin <mike@altlinux.org>
Original-patch-by: "Konstantin A. Lepikhov" <lakostis@altlinux.ru>

Regularize whitespace and be consistent using a fixed 8-byte
length for the `OpusTags` packet header, rather can calling
strlen on the literal. This length, and the offset of the
subsequence fields, is fixed by the specification, so using
a fixed length would great a less-corrupt file if the header
sequence were somehow changed.

Thanks to willson-chen for pointint out the style issue,
and Mark Harris for recommending the fixed header length.

I think this is more readable.

Additional header packets are disallowed by the spec and
rejected by the opusfile decoder library. Report this
condition in opusinfo so it's more obvious what's wrong
with such files.

The output is a little confusing when the extra packet
is in the first page as it also tries to parse it as
a comment header.
Signed-off-by: Ralph Giles <giles@thaumas.net>

src/opusdec.c:581:28: warning: implicit conversion from 'int'
    to 'float' changes value from 2147483647 to 2147483648
    [-Wimplicit-int-float-conversion]

The WAV size fields are unsigned 32-bit integers.  Fill them in if
the size would be less than 0xffffffff; otherwise use 0xffffffff to
indicate that the chunk continues until end of file (an unofficial
convention to allow WAV files larger than 4 GiB, when no chunks
follow the audio data).

Reported by Dmitriy

[mark.hsj: Update family numbers and fix buffer overflow]
Signed-off-by: Mark Harris <mark.hsj@gmail.com>

Closes https://github.com/xiph/opus-tools/pull/37

Signed-off-by: Mark Harris <mark.hsj@gmail.com>

WAV uses little endian for floats so they must be byte-swapped.

Reported by Mark Harris

(cherry picked from speexdsp commit 7181b9e84fbf6887c74807af5ad0030a5181640a)

Fixes illumos compiler warning.

If unspecified, lock onto the first plausible port and payload type;
do not mix content for different ports in the same output file.

Allows for automatic checking of arguments.

Adapted from https://github.com/xiph/opus-tools/pull/31, authored
by Muhammad Zaka.

In opusrtp sniff or extract mode, if an output file is specified but
not a payload type, record the first dynamic payload type seen with a
packet that could be a valid Opus packet.

Closes https://github.com/xiph/opus-tools/pull/31