OpusTodo

Code

For IETF draft

• Code cleanup (any left?)
• Multi-channel signalling (done, needs more testing)
• Make opus-compare fail for single seriously trashed frames

SILK issues

• PLC buffer not fully initialized (fix needs verifying)
• Mid and side using different sampling rates (fix needs verifying)
• LLBR stereo issue (has a proposed fix)
  • Introduces prefill bug (fixed on greg's tree)
• Artefacts on SILK mono<->stereo switching
• Artefacts on SILK frame size switching (e.g. 960,480 glitches)
• Reduce SILK bandpass switching artefacts
• Use of signed overflow (undefined in C), intentionally and otherwise.
• Encoder triggers DTX randomly (even if not enabled) for 40/60 ms stereo frames
• CLANG ARITHMETIC UNDEFINED at <silk/silk_NSQ_del_dec.c, (652:33)> : Op: *, Reason : Signed Multiplication Overflow, BINARY OPERATION: left (int32): 90005 right (int32): -25578
• CLANG ARITHMETIC UNDEFINED at <silk/decode_core.c, (108:40)> : Op: *, Reason : Signed Multiplication Overflow, BINARY OPERATION: left (int32): 916258817 right (int32): -3
• CLANG ARITHMETIC UNDEFINED at <silk/decode_core.c, (108:40)> : Op: +, Reason : Signed Addition Overflow, BINARY OPERATION: left (int32): -418535217 right (int32): -1832517634
• CLANG ARITHMETIC UNDEFINED at <./silk/Inlines.h, (120:13)> : Op: -=, Reason : Signed Subtraction Overflow, BINARY OPERATION: left (int32): 2147454976 right (int32): -2147467848
• CLANG ARITHMETIC UNDEFINED at <silk/LPC_analysis_filter.c, (68:25)> : Op: +, Reason : Signed Addition Overflow, BINARY OPERATION: left (int32): -2053682997 right (int32): -96356645
• CLANG ARITHMETIC UNDEFINED at <silk/LPC_analysis_filter.c, (67:25)> : Op: +, Reason : Signed Addition Overflow, BINARY OPERATION: left (int32): 2144927654 right (int32): 9275188
• CLANG ARITHMETIC UNDEFINED at <silk/LPC_analysis_filter.c, (63:21)> : Op: +, Reason : Signed Addition Overflow, BINARY OPERATION: left (int32): -1503335005 right (int32): -978520921
• CLANG ARITHMETIC UNDEFINED at <silk/LPC_analysis_filter.c, (64:21)> : Op: +, Reason : Signed Addition Overflow, BINARY OPERATION: left (int32): 1813111370 right (int32): 545673470
• CLANG ARITHMETIC UNDEFINED at <silk/LPC_analysis_filter.c, (65:21)> : Op: +, Reason : Signed Addition Overflow, BINARY OPERATION: left (int32): 2121005902 right (int32): 274731600
• CLANG ARITHMETIC UNDEFINED at <silk/LPC_analysis_filter.c, (72:21)> : Op: -, Reason : Signed Subtraction Overflow, BINARY OPERATION: left (int32): -79495168 right (int32): 2131398803
• Review Tim's "LSB with no pulses" fix
• Fix decoder-side resampling delay for rates other than 48 kHz and document behavior.
• Find_poly improvements
• Rename PLC.c
• silk warning: comparison is always true due to limited range of data type with assert
• Fatal (internal) error in silk/encode_indices.c, line 189: assertion failed: ( psIndices->contourIndex < 34 && psEncC->fs_kHz > 8 && psEncC->nb_subfr == 4 ) || ( psIndices->contourIndex < 11 && psEncC->fs_kHz == 8 && psEncC->nb_subfr == 4 ) || ( psIndices->contourIndex < 12 && psEncC->fs_kHz > 8 && psEncC->nb_subfr == 2 ) || ( psIndices->contourIndex < 3 && psEncC->fs_kHz == 8 && psEncC->nb_subfr == 2 )
• Fatal (internal) error in silk/encode_indices.c, line 130: assertion failed: psEncC->useInterpolatedNLSFs == 1 || psIndices->NLSFInterpCoef_Q2 == ( 1 << 2 )
• Fatal (internal) error in silk/encode_indices.c, line 209: assertion failed: psIndices->LTPIndex[ k ] >= 0 && psIndices->LTPIndex[ k ] < ( 8 << psIndices->PERIndex )

Later

• Exposed CELT constrained VBR
• Fixed-point build
• Fix build system (right now it fails to build shared libraries, drops .o files all over)
• Floating point API
• Usable command-line tools (opus is a major regression from libcelt right now)
• Smart automatic mode decision
• psymodel based VBR
• Remove copy in inverse MDCT
• Save some float<->int conversions

Spec

• Finish codec draft
• Ogg mapping (including multi-channel). See: OggOpus
• RTP payload format

Other

• Logo
• Test vectors
• Listening tests
• Documentation (at a minimum every exported symbol should have complete and accurate documentation)
• Add content to opus-codec.org
• Oggz-validate (should also validate opus toc)
  • The above documentation
  • Presentations
  • Examples and test results (hyperlink to Monty's demo, gmaxwell's HA results page, etc)
• Useful example software (e.g. streaming software that works correctly) (opus-tools in xiph git)
  • Support for resampling in tools

Third party software

• Support in ekiga
• Support in mumble
• Support in asterisk
• Support in firefox (rtcweb and in ogg)
• Support in VLC
• Support in ogg123
• Support in ffmpeg
• Support in rockbox
• Support in foobar2000
• Support in gstreamer
• Support in mplayer
• Support in xmms
• Support in oggdsf
• Support in xiphqt