From f40bfc9267b13b54e6379dfe7539447662879d24 Mon Sep 17 00:00:00 2001 From: Sean Bartell Date: Sat, 25 Jun 2011 21:32:25 -0400 Subject: Add codecs to librbcodec. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97 Reviewed-on: http://gerrit.rockbox.org/137 Reviewed-by: Nils Wallménius Tested-by: Nils Wallménius --- lib/rbcodec/codecs/libspeex/vorbis_psy.h | 97 ++++++++++++++++++++++++++++++++ 1 file changed, 97 insertions(+) create mode 100644 lib/rbcodec/codecs/libspeex/vorbis_psy.h (limited to 'lib/rbcodec/codecs/libspeex/vorbis_psy.h') diff --git a/lib/rbcodec/codecs/libspeex/vorbis_psy.h b/lib/rbcodec/codecs/libspeex/vorbis_psy.h new file mode 100644 index 0000000000..6871057753 --- /dev/null +++ b/lib/rbcodec/codecs/libspeex/vorbis_psy.h @@ -0,0 +1,97 @@ +/* Copyright (C) 2005 Jean-Marc Valin, CSIRO, Christopher Montgomery + File: vorbis_psy.h + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + - Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + + - Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + + - Neither the name of the Xiph.org Foundation nor the names of its + contributors may be used to endorse or promote products derived from + this software without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR + CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +*/ + +#ifndef VORBIS_PSY_H +#define VORBIS_PSY_H + +#ifdef VORBIS_PSYCHO + +#include "smallft.h" +#define P_BANDS 17 /* 62Hz to 16kHz */ +#define NOISE_COMPAND_LEVELS 40 + + +#define todB(x) ((x)>1e-13?log((x)*(x))*4.34294480f:-30) +#define fromdB(x) (exp((x)*.11512925f)) + +/* The bark scale equations are approximations, since the original + table was somewhat hand rolled. The below are chosen to have the + best possible fit to the rolled tables, thus their somewhat odd + appearance (these are more accurate and over a longer range than + the oft-quoted bark equations found in the texts I have). The + approximations are valid from 0 - 30kHz (nyquist) or so. + + all f in Hz, z in Bark */ + +#define toBARK(n) (13.1f*atan(.00074f*(n))+2.24f*atan((n)*(n)*1.85e-8f)+1e-4f*(n)) +#define fromBARK(z) (102.f*(z)-2.f*pow(z,2.f)+.4f*pow(z,3.f)+pow(1.46f,z)-1.f) + +/* Frequency to octave. We arbitrarily declare 63.5 Hz to be octave + 0.0 */ + +#define toOC(n) (log(n)*1.442695f-5.965784f) +#define fromOC(o) (exp(((o)+5.965784f)*.693147f)) + + +typedef struct { + + float noisewindowlo; + float noisewindowhi; + int noisewindowlomin; + int noisewindowhimin; + int noisewindowfixed; + float noiseoff[P_BANDS]; + float noisecompand[NOISE_COMPAND_LEVELS]; + +} VorbisPsyInfo; + + + +typedef struct { + int n; + int rate; + struct drft_lookup lookup; + VorbisPsyInfo *vi; + + float *window; + float *noiseoffset; + long *bark; + +} VorbisPsy; + + +VorbisPsy *vorbis_psy_init(int rate, int size); +void vorbis_psy_destroy(VorbisPsy *psy); +void compute_curve(VorbisPsy *psy, float *audio, float *curve); +void curve_to_lpc(VorbisPsy *psy, float *curve, float *awk1, float *awk2, int ord); + +#endif +#endif -- cgit v1.2.3