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RFC 6716

 
 
 

Definition of the Opus Audio Codec

Part 8 of 14, p. 155 to 179
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6.  Conformance

   It is our intention to allow the greatest possible choice of freedom
   in implementing the specification.  For this reason, outside of the
   exceptions noted in this section, conformance is defined through the
   reference implementation of the decoder provided in Appendix A.
   Although this document includes a prose description of the codec,
   should the description contradict the source code of the reference
   implementation, the latter shall take precedence.

   Compliance with this specification means that, in addition to
   following the normative keywords in this document, a decoder's output
   MUST also be within the thresholds specified by the opus_compare.c
   tool (included with the code) when compared to the reference
   implementation for each of the test vectors provided (see
   Appendix A.4) and for each output sampling rate and channel count
   supported.  In addition, a compliant decoder implementation MUST have
   the same final range decoder state as that of the reference decoder.
   It is therefore RECOMMENDED that the decoder implement the same
   functional behavior as the reference.  A decoder implementation is
   not required to support all output sampling rates or all output
   channel counts.

6.1.  Testing

   Using the reference code provided in Appendix A, a test vector can be
   decoded with

      opus_demo -d <rate> <channels> testvectorX.bit testX.out

   where <rate> is the sampling rate and can be 8000, 12000, 16000,
   24000, or 48000, and <channels> is 1 for mono or 2 for stereo.

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   If the range decoder state is incorrect for one of the frames, the
   decoder will exit with "Error: Range coder state mismatch between
   encoder and decoder".  If the decoder succeeds, then the output can
   be compared with the "reference" output with

      opus_compare -s -r <rate> testvectorX.dec testX.out

   for stereo or

      opus_compare -r <rate> testvectorX.dec testX.out

   for mono.

   In addition to indicating whether the test vector comparison passes,
   the opus_compare tool outputs an "Opus quality metric" that indicates
   how well the tested decoder matches the reference implementation.  A
   quality of 0 corresponds to the passing threshold, while a quality of
   100 is the highest possible value and means that the output of the
   tested decoder is identical to the reference implementation.  The
   passing threshold (quality 0) was calibrated in such a way that it
   corresponds to additive white noise with a 48 dB SNR (similar to what
   can be obtained on a cassette deck).  It is still possible for an
   implementation to sound very good with such a low quality measure
   (e.g., if the deviation is due to inaudible phase distortion), but
   unless this is verified by listening tests, it is RECOMMENDED that
   implementations achieve a quality above 90 for 48 kHz decoding.  For
   other sampling rates, it is normal for the quality metric to be lower
   (typically, as low as 50 even for a good implementation) because of
   harmless mismatch with the delay and phase of the internal sampling
   rate conversion.

   On POSIX environments, the run_vectors.sh script can be used to
   verify all test vectors.  This can be done with

      run_vectors.sh <exec path> <vector path> <rate>

   where <exec path> is the directory where the opus_demo and
   opus_compare executables are built and <vector path> is the directory
   containing the test vectors.

6.2.  Opus Custom

   Opus Custom is an OPTIONAL part of the specification that is defined
   to handle special sample rates and frame rates that are not supported
   by the main Opus specification.  Use of Opus Custom is discouraged
   for all but very special applications for which a frame size
   different from 2.5, 5, 10, or 20 ms is needed (for either complexity
   or latency reasons).  Because Opus Custom is optional, streams

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   encoded using Opus Custom cannot be expected to be decodable by all
   Opus implementations.  Also, because no in-band mechanism exists for
   specifying the sampling rate and frame size of Opus Custom streams,
   out-of-band signaling is required.  In Opus Custom operation, only
   the CELT layer is available, using the opus_custom_* function calls
   in opus_custom.h.

7.  Security Considerations

   Like any other audio codec, Opus should not be used with insecure
   ciphers or cipher-modes that are vulnerable to known plaintext
   attacks.  In addition to the zeros used in Opus padding, digital
   silence frames generate predictable compressed results and the TOC
   byte may have an easily predictable value.

   Implementations of the Opus codec need to take appropriate security
   considerations into account, as outlined in [DOS].  It is extremely
   important for the decoder to be robust against malicious payloads.
   Malicious payloads must not cause the decoder to overrun its
   allocated memory or to take an excessive amount of resources to
   decode.  Although problems in encoders are typically rarer, the same
   applies to the encoder.  Malicious audio streams must not cause the
   encoder to misbehave because this would allow an attacker to attack
   transcoding gateways.

   The reference implementation contains no known buffer overflow or
   cases where a specially crafted packet or audio segment could cause a
   significant increase in CPU load.  However, on certain CPU
   architectures where denormalized floating-point operations are much
   slower than normal floating-point operations, it is possible for some
   audio content (e.g., silence or near silence) to cause an increase in
   CPU load.  Denormals can be introduced by reordering operations in
   the compiler and depend on the target architecture, so it is
   difficult to guarantee that an implementation avoids them.  For
   architectures on which denormals are problematic, adding very small
   floating-point offsets to the affected signals to prevent significant
   numbers of denormalized operations is RECOMMENDED.  Alternatively, it
   is often possible to configure the hardware to treat denormals as
   zero (DAZ).  No such issue exists for the fixed-point reference
   implementation.

   The reference implementation was validated in the following
   conditions:

   1.  Sending the decoder valid packets generated by the reference
       encoder and verifying that the decoder's final range coder state
       matches that of the encoder.

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   2.  Sending the decoder packets generated by the reference encoder
       and then subjected to random corruption.

   3.  Sending the decoder random packets.

   4.  Sending the decoder packets generated by a version of the
       reference encoder modified to make random coding decisions
       (internal fuzzing), including mode switching, and verifying that
       the range coder final states match.

   In all of the conditions above, both the encoder and the decoder were
   run inside the Valgrind [VALGRIND] memory debugger, which tracks
   reads and writes to invalid memory regions as well as the use of
   uninitialized memory.  There were no errors reported on any of the
   tested conditions.

8.  Acknowledgements

   Thanks to all other developers, including Henrik Astrom, Jon
   Bergenheim, Raymond Chen, Soren Skak Jensen, Gregory Maxwell,
   Christopher Montgomery, and Karsten Vandborg Sorensen.  We would also
   like to thank Igor Dyakonov, Hoang Thi Minh Nguyet, Christian Hoene,
   Gian-Carlo Pascutto, and Jan Skoglund for their help with testing of
   the Opus codec.  Thanks to Andrew D'Addesio, Elwyn Davies, Ralph
   Giles, John Ridges, Ben Schwartz, Kat Walsh, Mark Warner, Keith Yan,
   and many others on the Opus and CELT mailing lists for their bug
   reports and feedback.  At last, the authors would like to thank
   Robert Sparks, Cullen Jennings, and Jonathan Rosenberg for their
   support throughout the standardization process.

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9.  References

9.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

9.2.  Informative References

   [BURG]     Burg, J., "Maximum Entropy Spectral Analysis", Proceedings
              of the 37th Annual International SEG Meeting, Vol.
              6, 1975.

   [CELT]     Valin, JM., Terriberry, T., Maxwell, G., and C.
              Montgomery, "Constrained-Energy Lapped Transform (CELT)
              Codec", Work in Progress, July 2010.

   [CODING-THESIS]
              Pasco, R., "Source coding algorithms for fast data
              compression", Ph.D. thesis Dept. of Electrical
              Engineering, Stanford University, May 1976.

   [DOS]      Handley, M., Rescorla, E., and IAB, "Internet Denial-of-
              Service Considerations", RFC 4732, December 2006.

   [FFT]      Wikipedia, "Fast Fourier Transform",
              <http://en.wikipedia.org/w/
              index.php?title=Fast_Fourier_transform&oldid=508004516>.

   [GOOGLE-NETEQ]
              "Google NetEQ code", <http://code.google.com/p/webrtc/
              source/browse/trunk/src/modules/audio_coding/NetEQ/main/
              source/?r=583>.

   [GOOGLE-WEBRTC]
              "Google WebRTC code", <http://code.google.com/p/webrtc/>.

   [HADAMARD] Wikipedia, "Hadamard Transform", <http://en.wikipedia.org/
              w/index.php?title=Hadamard_transform&oldid=508252957>.

   [KABAL86]  Kabal, P. and R. Ramachandran, "The Computation of Line
              Spectral Frequencies Using Chebyshev Polynomials", IEEE
              Trans. Acoustics, Speech, Signal Processing, Vol. 34, no.
              6, pp. 1419-1426, December 1986.

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   [LAROIA-ICASSP]
              Laroia, R., Phamdo, N., and N. Farvardin, "Robust and
              Efficient Quantization of Speech LSP Parameters Using
              Structured Vector Quantization", ICASSP-1991, Proc. IEEE
              Int. Conf. Acoust., Speech, Signal Processing, pp. 641-
              644, October 1991.

   [LPC]      Wikipedia, "Linear Prediction", <http://en.wikipedia.org/
              w/index.php?title=Linear_prediction&oldid=497201278>.

   [MARTIN79] Martin, G., "Range encoding: An algorithm for removing
              redundancy from a digitised message", Proc. Institution of
              Electronic and Radio Engineers International Conference on
              Video and Data Recording, 1979.

   [MATROSKA-WEBSITE]
              "Matroska website", <http://matroska.org/>.

   [MDCT]     Wikipedia, "Modified Discrete Cosine Transform", <http://
              en.wikipedia.org/w/
              index.php?title=Modified_discrete_cosine_
              transform&oldid=490295438>.

   [OPUS-GIT] "Opus Git Repository", <https://git.xiph.org/opus.git>.

   [OPUS-WEBSITE]
              "Opus website", <http://opus-codec.org/>.

   [PRINCEN86]
              Princen, J. and A. Bradley, "Analysis/Synthesis Filter
              Bank Design Based on Time Domain Aliasing Cancellation",
              IEEE Trans. Acoustics, Speech, and Siginal Processing,
              ASSP-34 (5), pp. 1153-1161, October, 1986.

   [PVQ]      Fischer, T., "A Pyramid Vector Quantizer", IEEE Trans. on
              Information Theory, Vol. 32, pp. 568-583, July 1986.

   [RANGE-CODING]
              Wikipedia, "Range Coding", <http://en.wikipedia.org/w/
              index.php?title=Range_encoding&oldid=509582757>.

   [REQUIREMENTS]
              Valin, JM. and K. Vos, "Requirements for an Internet Audio
              Codec", RFC 6366, August 2011.

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   [RFC3533]  Pfeiffer, S., "The Ogg Encapsulation Format Version 0",
              RFC 3533, May 2003.

   [RFC3550]  Schulzrinne, H., Casner, S., Frederick, R., and V.
              Jacobson, "RTP: A Transport Protocol for Real-Time
              Applications", STD 64, RFC 3550, July 2003.

   [SCHUR]    Le Roux, J. and C. Gueguen, "A fixed point computation of
              partial correlation coefficients", ICASSP-1977, Proc. IEEE
              Int. Conf. Acoustics, Speech, and Signal Processing, pp.
              257-259, June 1977.

   [SILK]     Vos, K., Jensen, S., and K. Sorensen, "SILK Speech Codec",
              Work in Progress, September 2010.

   [SPECTRAL-PAIRS]
              Wikipedia, "Line Spectral Pairs", <http://
              en.wikipedia.org/w/
              index.php?title=Line_spectral_pairs&oldid=365426016>.

   [SRTP-VBR] Perkins, C. and JM. Valin, "Guidelines for the Use of
              Variable Bit Rate Audio with Secure RTP", RFC 6562,
              March 2012.

   [VALGRIND] "Valgrind website", <http://valgrind.org/>.

   [VALIN2010]
              Valin, JM., Terriberry, T., Montgomery, C., and G.
              Maxwell, "A High-Quality Speech and Audio Codec With Less
              Than 10 ms Delay", IEEE Trans. on Audio, Speech, and
              Language Processing, Vol. 18, No. 1, pp. 58-67 2010.

   [VECTORS-PROC]
              "Opus Testvectors (proceedings)", <http://www.ietf.org/
              proceedings/83/slides/slides-83-codec-0.gz>.

   [VECTORS-WEBSITE]
              "Opus Testvectors (website)",
              <http://opus-codec.org/testvectors/>.

   [VITERBI]  Wikipedia, "Viterbi Algorithm", <http://en.wikipedia.org/
              w/index.php?title=Viterbi_algorithm&oldid=508835871>.

   [VORBIS-WEBSITE]
              "Vorbis website", <http://xiph.org/vorbis/>.

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   [WHITENING]
              Wikipedia, "White Noise", <http://en.wikipedia.org/w/
              index.php?title=White_noise&oldid=497791998>.

   [Z-TRANSFORM]
              Wikipedia, "Z-transform", <http://en.wikipedia.org/w/
              index.php?title=Z-transform&oldid=508392884>.

   [ZWICKER61]
              Zwicker, E., "Subdivision of the Audible Frequency Range
              into Critical Bands", The Journal of the Acoustical
              Society of America, Vol. 33, No 2 pp. 248, February 1961.

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Appendix A.  Reference Implementation

   This appendix contains the complete source code for the reference
   implementation of the Opus codec written in C.  By default, this
   implementation relies on floating-point arithmetic, but it can be
   compiled to use only fixed-point arithmetic by defining the
   FIXED_POINT macro.  The normative behavior is defined as the output
   using the floating-point configuration.  Information on building and
   using the reference implementation is available in the README file.

   The implementation can be compiled with either a C89 or a C99
   compiler.  It is reasonably optimized for most platforms such that
   only architecture-specific optimizations are likely to be useful.
   The Fast Fourier Transform (FFT) [FFT] used is a slightly modified
   version of the KISS-FFT library, but it is easy to substitute any
   other FFT library.

   While the reference implementation does not rely on any _undefined
   behavior_ as defined by C89 or C99, it relies on common
   _implementation-defined behavior_ for two's complement architectures:

   o  Right shifts of negative values are consistent with two's
      complement arithmetic, so that a>>b is equivalent to
      floor(a/(2**b)),

   o  For conversion to a signed integer of N bits, the value is reduced
      modulo 2**N to be within range of the type,

   o  The result of integer division of a negative value is truncated
      towards zero, and

   o  The compiler provides a 64-bit integer type (a C99 requirement
      which is supported by most C89 compilers).

   In its current form, the reference implementation also requires the
   following architectural characteristics to obtain acceptable
   performance:

   o  Two's complement arithmetic,

   o  At least a 16 bit by 16 bit integer multiplier (32-bit result),
      and

   o  At least a 32-bit adder/accumulator.

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A.1.  Extracting the Source

   The complete source code can be extracted from this document, by
   running the following command line:

   o  cat rfc6716.txt | grep '^\ \ \ ###' | sed -e 's/...###//' | base64
      --decode > opus-rfc6716.tar.gz

   o  tar xzvf opus-rfc6716.tar.gz

   o  cd opus-rfc6716

   o  make

   On systems where the provided Makefile does not work, the following
   command line may be used to compile the source code:

   o  cc -O2 -g -o opus_demo src/opus_demo.c `cat *.mk | grep -v fixed |
      sed -e 's/.*=//' -e 's/\\\\//'` -DOPUS_BUILD -Iinclude -Icelt
      -Isilk -Isilk/float -DUSE_ALLOCA -Drestrict= -lm

   On systems where the base64 utility is not present, the following
   commands can be used instead:

   o  cat rfc6716.txt | grep '^\ \ \ ###' | sed -e 's/...###//' >
      opus.b64

   o  openssl base64 -d -in opus.b64 > opus-rfc6716.tar.gz

   The SHA1 hash of the opus-rfc6716.tar.gz file is
   86a927223e73d2476646a1b933fcd3fffb6ecc8c.

A.2.  Up-to-Date Implementation

   As of the time of publication of this memo, an up-to-date
   implementation conforming to this RFC is available in a Git
   repository [OPUS-GIT].  Releases and other resources are available at
   [OPUS-WEBSITE].  However, although that implementation is expected to
   remain conformant with the RFC, it is the code in this document that
   shall remain normative.

A.3.  Base64-Encoded Source Code

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