eden-emu/opus
19
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions
1457 commits 285 branches 59 tags 26 MiB
Commit graph

193 commits

Author SHA1 Message Date
Jean-Marc Valin
c39bb8ab8c Removes unused function parameters 2011-01-26 10:50:55 -05:00
Jean-Marc Valin
ad3d813f01 Stop uselessly calling haar1() when resynth=0 
This was computing on uninitialized data (though the result was never
used)
 2011-01-22 21:22:03 -05:00
Jean-Marc Valin
63fb61f176 Using previous range coder state for PRNG 
This provides more entropy and allows some more flexibility on the
encoder side.
 2011-01-20 23:29:05 -05:00
Timothy B. Terriberry
21af73eb21 Make collapse-detection bitexact. 
Jean-Marc's original anti-collapse patch used a threshold on the
 content of a decoded band to determine whether or not it should
 be filled with random noise.
Since this is highly sensitive to the accuracy of the
 implementation, it could lead to significant decoder output
 differences even if decoding error up to that point was relatively
 small.

This patch detects collapsed bands from the output of the vector
 quantizer, using exact integer arithmetic.
It makes two simplifying assumptions:
 a) If either input to haar1() is non-zero during TF resolution
     adjustments, then the output will be non-zero.
 b) If the content of a block is non-zero in any of the bands that
     are used for folding, then the folded output will be non-zero.
b) in particular is likely to be false when SPREAD_NONE is used.
It also ignores the case where mid and side are orthogonal in
 stereo_merge, but this is relatively unlikely.
This misses just over 3% of the cases that Jean-Marc's anti-collapse
 detection strategy would catch, but does not mis-classify any (all
 detected collapses are true collapses).

This patch overloads the "fill" parameter to mark which blocks have
 non-zero content for folding.
As a consequence, if a set of blocks on one side of a split has
 collapsed, _no_ folding is done: the result would be zero anyway,
 except for short blocks with SPREAD_AGGRESSIVE that are split down
 to a single block, but a) that means a lot of bits were available
 so a collapse is unlikely and b) anti-collapse can fill the block
 anyway, if it's used.
This also means that if itheta==0 or itheta==16384, we no longer
 fold at all on that side (even with long blocks), since we'd be
 multiplying the result by zero anyway.
 2011-01-19 19:43:08 -05:00
Timothy B. Terriberry
320cf2e2cd Re-organize spreading/folding constants. 
These were stored internally in one order and in the bitstream in a
 different order.
Both used bare constants, making it unclear what either actually
 meant.
This changes them to use the same order, gives them named constants,
 and renames all the "fold" decision stuff to "spread" instead,
 since that is what it is really controlling.
 2010-12-17 10:35:51 -05:00
Jean-Marc Valin
85bbab0b4a Fixes a fixed-point overflow in stereo angle calculation 2010-12-09 15:23:45 -05:00
Jean-Marc Valin
9b4ed5e290 Implementing intensity stereo. 
There's no explicit signaling for it yet.
 2010-11-24 18:01:20 -05:00
Jean-Marc Valin
3295b5d56b Folding code moved to quant_band() to prevent duplication. 2010-10-15 23:43:45 -04:00
Jean-Marc Valin
c4711e4e11 More VQ search simplifications 2010-10-15 23:31:06 -04:00
Jean-Marc Valin
bbc010c4f3 Removing yshift from the fixed-point VQ search 2010-10-15 22:55:35 -04:00
Jean-Marc Valin
3d25e71b40 More simplifications to the VQ search 2010-10-15 22:45:02 -04:00
Jean-Marc Valin
aca7a63040 VQ search no longer needs to put more than one pulse at a time 2010-10-15 22:06:36 -04:00
Jean-Marc Valin
ccd51fe947 No longer filling the stereo side with noise. 2010-10-13 11:48:17 -04:00
Jean-Marc Valin
009978ee6c Moves the bit-side gain application to the quantizer 2010-09-13 11:05:08 -04:00
Jean-Marc Valin
eea914cb88 Simplifies vector renormalisation (and using it less) 2010-09-12 20:11:32 -04:00
Jean-Marc Valin
736efd6909 Fixes some MSVC warnings 2010-08-31 11:52:45 -04:00
Jean-Marc Valin
d38d6b9aa1 Implemented variable spreading amount in the decoder 
Decision not yet implemented in the encoder
 2010-08-07 09:21:32 -04:00
Timothy B. Terriberry
828da91d66 Minor simplification to exp_rotation(). 2010-08-06 21:43:49 -04:00
Jean-Marc Valin
39ffbeec9a Comments 2010-08-06 07:40:11 -04:00
Jean-Marc Valin
6f1cbca519 More cleanup 2010-07-24 22:06:29 -04:00
Jean-Marc Valin
f276b23415 Using random noise in upper bands when signal is "normal" 2010-07-24 17:13:17 -04:00
Jean-Marc Valin
ea245c5ca9 Fixed C99-style declaration 2010-07-06 20:25:54 -04:00
Jean-Marc Valin
67217ee746 Splitting transients in time domain 2010-05-21 13:58:51 -04:00
Jean-Marc Valin
2123f358b1 Cleaning up the folding code. 
Folding now moved to alg_quant() and alg_unquant(). No more funny short block
alignment checks because bands now have to be aligned.
 2010-05-09 19:45:31 -04:00
Jean-Marc Valin
65ee67ac55 Making the band definition the same at all frame sizes. 2010-04-26 07:08:44 -04:00
Jean-Marc Valin
8271dc8a22 Tuning the amount of spreading based on Koen's feedback 2010-04-20 00:47:22 -04:00
Jean-Marc Valin
b8ba70c99b Disabling resynthesis when not needed (need to remove folding for this to work) 2010-04-18 22:10:24 -04:00
Jean-Marc Valin
b8a06ee00d Re-introducing the successive spreading rotations, but in a two-step 
scheme. Keeping Hadamard as an option (disabled for now) for transients.
 2010-04-18 09:57:42 -04:00
Jean-Marc Valin
65a487069d Corrected some non-sensical code 2010-04-17 17:29:03 -04:00
Jean-Marc Valin
628c025373 Converted a few double-precision constants to single precision 2010-04-16 20:57:56 -04:00
Jean-Marc Valin
137f3366bc Changed compute_allocation_table() so it handles ebands that start and end in the same allocation band. Also fixed a minor C89 issue. 2010-04-14 17:42:22 -04:00
Jean-Marc Valin
9a92d61ee8 A bit more tuning on the pseudo-frac-Hadamard. Also Trying to improve 
transient spreading.
 2010-04-06 20:33:12 -04:00
Jean-Marc Valin
354bf60b04 Doing the spreading with a "pseudo-fractional-Hadamard" transform 2010-04-03 09:23:29 -04:00
Jean-Marc Valin
c7b01bad50 fixed-point: slightly increasing the decoder accuracy again 2010-03-19 23:17:28 -04:00
Jean-Marc Valin
3a4a463f0a fixed-point: Further reduction in mismatch 2010-03-15 22:55:51 -04:00
Jean-Marc Valin
3a0bc3d95c Allowing CELT to skip the low frequencies 2010-02-25 22:46:55 -05:00
Timothy Terriberry
8c7bb4c9c7 Expose the normalized range for reciprocal square roots in fixed-point mode. This allows subsequnt calculations to use the full precision of the result. 2009-10-31 13:35:40 -04:00
Jean-Marc Valin
a3803a98af misc minor changes 2009-10-24 11:24:34 -04:00
Jean-Marc Valin
73bf6332ed Making the multiplication in normalise_residual() produce a 32-bit result just 
to be on the safe side (not that I observed any overflow, but I can't prove
it can't happen).
 2009-10-20 07:22:04 -04:00
Jean-Marc Valin
234969c903 Removed the _t from all the celt*_t types to avoid clashing with POSIX 2009-10-17 22:12:42 -04:00
Jean-Marc Valin
8b2ff0da5a Updated copyright notices 2009-10-17 21:40:10 -04:00
Jean-Marc Valin
f7a1e165aa Renamed mix_pitch_and_residual() to normalise_residual(), after minor 
simplification.
 2009-10-07 06:56:03 -04:00
Jean-Marc Valin
f6dc1eba26 Further simplifications to mix_pitch_and_residual() (which no longer does 
anything that its name implies)
 2009-10-06 20:08:49 -04:00
Jean-Marc Valin
1e3263a267 Fix for some test program compat and an assertion that didn't make sense anymore 2009-10-02 17:48:25 -04:00
Jean-Marc Valin
d5e5436e07 Fix for folding_decision() in stereo mode and more cleaning up of the code 
now that we no longer do normalized pitch
 2009-09-30 20:50:41 -04:00
Jean-Marc Valin
75732de1a7 Tuning the spreading rotations 2009-09-29 22:35:32 -04:00
Jean-Marc Valin
095c1782c5 Removed code that is no longer necessary with denorm pitch and spreading 2009-09-17 22:38:34 -04:00
Jean-Marc Valin
3aa3afe74f Only calling intra_fold() when there's no pulse allocated 2009-09-11 20:28:29 -04:00
Jean-Marc Valin
a7750b90cc Re-introducing the successive rotations as a way to control low-bitrate 
tonal artefacts. This replaces folding for all cases where we have at least
one pulse.
 2009-08-29 22:52:03 +01:00
Jean-Marc Valin
164a229644 Reducing the size of the pulses->bits cache by restricting the number of pulses 
possible
 2009-07-23 07:24:03 -04:00