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    Squashed commit of the following: · 35095c69
    Jean-Marc Valin authored
    commit a2cc77cb2744a2cb0551b9bfdf06b97457b6d449
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Thu Nov 4 13:11:21 2010 -0400
    
        Adding a switch to enable the post-filter (off by default)
    
    commit 8e860dc0dfbe57e59fcbd5352588c5edff020e27
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Thu Nov 4 11:57:12 2010 -0400
    
        Allowing pitches up to 3000 Hz
    
    commit 837412d37bbca32bb34bfb5941e132ff4b0a568c
    Author: Jean-Marc Valin <jean-marc.valin@usherbrooke.ca>
    Date:   Wed Nov 3 20:47:11 2010 -0400
    
        Pitch estimation tuning to prevent some cases of pitch halving
    
    commit 34e20f24c85b40fffd1a15c5b632f2f78b26f081
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Wed Nov 3 16:31:51 2010 -0400
    
        Resynthesis now purely a compile-time option with RESYNTH
    
    commit d83fb5a9cc2ec4b6cce938662997643da1c5ed0d
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Wed Nov 3 16:28:25 2010 -0400
    
        Fixes a divide by zero in remove_doubling()
    
    commit bb91e05b7f8f91fd15a8a0daae3d8cb6bd8d81db
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Wed Nov 3 15:55:48 2010 -0400
    
        Bring back resynthesis with RESYNTH macro
    
    commit 31fe6f6b4997af0a46b8c62f523fe2dfdb7f56ae
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Tue Nov 2 17:55:04 2010 -0400
    
        Tuning the allocation tilt to give more bits to higher frequencies.
    
        Especially useful now that the post-filter can reduce low freq noise.
    
    commit 919ba48f0369a87885334756cdfac2a448ce52d0
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Mon Nov 1 17:27:19 2010 -0400
    
        C89 fix
    
    commit ee0dbb1855a82ee8c132ddaffcab4d072bb3455e
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Mon Nov 1 11:45:10 2010 -0400
    
        Complete fixed-point port of the pitch code (I think).
    
    commit 4c7b3fd12a8f7469607b5ac57c85301a5de9fa81
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Mon Nov 1 10:55:43 2010 -0400
    
        More fixed-point pitch gain work
    
    commit 26f1412188900199b63e187fcb0bd04db53c898a
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Mon Nov 1 10:39:25 2010 -0400
    
        Fixed-point version of the pitch gain calculation code
    
    commit 27c73d008e9f50d282c3ad08e2f05f7006013ae1
    Author: Jean-Marc Valin <jean-marc.valin@usherbrooke.ca>
    Date:   Sun Oct 31 16:50:26 2010 -0400
    
        Some more fixed-point work in remove_doubling()
    
    commit 59354672cb3af794a0e46c0b2097d6441c75cdd1
    Author: Jean-Marc Valin <jean-marc.valin@usherbrooke.ca>
    Date:   Sun Oct 31 09:57:36 2010 -0400
    
        Fixed a stupid fixed-point pf bug in the gain handling
    
    commit be9e7dabf6c8b32bc049da260b58ff6085dc1ac3
    Author: Jean-Marc Valin <jean-marc.valin@usherbrooke.ca>
    Date:   Sat Oct 30 01:52:09 2010 -0400
    
        Fixed-point: fixed frac_div32() that was broken a few commits ago.
    
    commit 5b06270afc41a88915252cea14411be43650e704
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Fri Oct 29 17:45:44 2010 -0400
    
        This fixes VBR when encoding the pitch period with raw bits
    
    commit 10e0488458ae558aa80d0b30cce70841ad081f73
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Fri Oct 29 16:50:31 2010 -0400
    
        Pitch period is now encoder with equal probability for each octave (rather than each lag).
    
        Max pitch gain allowed is now 0.625.
    
    commit ca19396c1c1511c0e208b400efb51384fc7c200d
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Fri Oct 29 16:00:01 2010 -0400
    
        More fixed-point post-filter work
    
    commit f3e42fde1b575bc587b2557b8b31a6085421a99c
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Fri Oct 29 14:39:23 2010 -0400
    
        More fixed-point work for the prefilter/postfilter
    
    commit db945132d12b25ff25acc0701b91a1d8a81417d5
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Fri Oct 29 14:14:02 2010 -0400
    
        Making the pitch estimation work in fixed-point
    
        Even if there's still lots of float operations left.
    
    commit acb3f96e04802ac4601295f83bef1f32593e261a
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Fri Oct 29 10:57:39 2010 -0400
    
        Making the PLC code consistent with the prefilter/postfilter
    
    commit 8f64f5974ac846b8c35d0b692e0472f279206cf0
    Author: Jean-Marc Valin <jean-marc.valin@usherbrooke.ca>
    Date:   Thu Oct 28 00:33:53 2010 -0400
    
        More tuning for remove_doubling()
    
    commit 0c08f2ee9dcc135dd222fef30f5ad93e95e0d364
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Wed Oct 27 17:48:02 2010 -0400
    
        Doing an interpolation step to improve the accuracy of the pitch estimate
    
        Also increasing the gain slightly.
    
    commit 23d303e992f1fdc3d2668652603ae6311d3b91c5
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Wed Oct 27 16:56:42 2010 -0400
    
        Implements a fixed 3-tap prefilter/postfilter to make the gain roll off with frequency
    
    commit 881c5928adc1af9eb75c4b68e9eba94ab1d65adc
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Wed Oct 27 14:47:30 2010 -0400
    
        Partially whitening the down-sampled signal before the pitch search
    
    commit 4a8687deea8587007f14051cb966f6fd748893a1
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Wed Oct 27 14:27:47 2010 -0400
    
        pitch_search() no longer computes the gain
    
    commit a7f85bb6b10d9c509caec521ca444efb3f27df05
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Wed Oct 27 14:00:53 2010 -0400
    
        remove_doubling() now works on the down-sampled signal
    
    commit 06cb70e876873f79fed214ebbca35cb4c5057ec8
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Wed Oct 27 11:28:53 2010 -0400
    
        Simplification to the pitch continuity code
    
    commit 5201927c284a424eb8f21f63d358844b3de8c285
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Wed Oct 27 11:04:02 2010 -0400
    
        Some more pitch doubling prevention code
    
    commit 7ef63fbe1f78f79e1923bc42e06fbdf1ec28ffd3
    Author: Jean-Marc Valin <jean-marc.valin@usherbrooke.ca>
    Date:   Wed Oct 27 06:49:28 2010 -0400
    
        Minor fix
    
    commit eb37eaab32e7df074a7ddf0ae4781e57f827c4ad
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Tue Oct 26 18:32:25 2010 -0400
    
        Enforcing some pitch continuity
    
    commit 751ef6edf2ee7721252cedb264bdf9b3f6244a9d
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Tue Oct 26 17:29:47 2010 -0400
    
        Code for preventing pitch doubling/halving
    
    commit c12647ecb55b645005efbeede91880db72936f8d
    Author: Jean-Marc Valin <jean-marc.valin@usherbrooke.ca>
    Date:   Tue Oct 26 00:04:34 2010 -0400
    
        Finally getting perfect reconstruction when pitch changes
    
        Post-filter now delays the filter coefs by the overlap so that the pre-filter
        and post-filter are synchronised.
    
    commit f854311d945bb375039a4a4a4fea782b648581f8
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Mon Oct 25 14:59:13 2010 -0400
    
        Very simple/inefficient signalling of the prefilter period/gain
    
    commit b4e1215432e3d89a29c998639a6d8b07e28c5a2a
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Mon Oct 25 14:09:17 2010 -0400
    
        using the actual pitch gain
    
    commit e7cd4f07bb073b6955a001e56c0bbf16156f4195
    Author: Jean-Marc Valin <jean-marc.valin@octasic.com>
    Date:   Mon Oct 25 12:16:11 2010 -0400
    
        Adding some pitch prediction though side information still isn't coded
    
    commit 77a03aa27c9b6ed2fe80c27a1196b460ccb5079e
    Author: Jean-Marc Valin <jean-marc.valin@usherbrooke.ca>
    Date:   Mon Oct 25 00:12:48 2010 -0400
    
        prefilter implemented as well
    
    commit a3fd81b6ca213d4a9f8ddfa2883fd0e238d64d04
    Author: Jean-Marc Valin <jean-marc.valin@usherbrooke.ca>
    Date:   Sun Oct 24 01:14:10 2010 -0400
    
        Implementing Raymond Chen's comb filter idea
    
        So far, only the post-filter is there.
    35095c69