/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
/* JOrbis
* Copyright (C) 2000 ymnk, JCraft,Inc.
*
* Written by: 2000 ymnk<ymnk@jcraft.com>
*
* Many thanks to
* Monty <monty@xiph.org> and
* The XIPHOPHORUS Company http://www.xiph.org/ .
* JOrbis has been based on their awesome works, Vorbis codec.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public License
* as published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
package com.jcraft.jorbis;
import com.jcraft.jogg.Buffer;
class Floor0 extends FuncFloor {
void pack(Object i, Buffer opb) {
InfoFloor0 info = (InfoFloor0) i;
opb.write(info.order, 8);
opb.write(info.rate, 16);
opb.write(info.barkmap, 16);
opb.write(info.ampbits, 6);
opb.write(info.ampdB, 8);
opb.write(info.numbooks - 1, 4);
for (int j = 0; j < info.numbooks; j++)
opb.write(info.books[j], 8);
}
Object unpack(Info vi, Buffer opb) {
InfoFloor0 info = new InfoFloor0();
info.order = opb.read(8);
info.rate = opb.read(16);
info.barkmap = opb.read(16);
info.ampbits = opb.read(6);
info.ampdB = opb.read(8);
info.numbooks = opb.read(4) + 1;
if ((info.order < 1) || (info.rate < 1) || (info.barkmap < 1) || (info.numbooks < 1)) {
return (null);
}
for (int j = 0; j < info.numbooks; j++) {
info.books[j] = opb.read(8);
if (info.books[j] < 0 || info.books[j] >= vi.books) {
return (null);
}
}
return (info);
}
Object look(DspState vd, InfoMode mi, Object i) {
float scale;
Info vi = vd.vi;
InfoFloor0 info = (InfoFloor0) i;
LookFloor0 look = new LookFloor0();
look.m = info.order;
look.n = vi.blocksizes[mi.blockflag] / 2;
look.ln = info.barkmap;
look.vi = info;
look.lpclook.init(look.ln, look.m);
// we choose a scaling constant so that:
scale = look.ln / toBARK((float) (info.rate / 2.));
// the mapping from a linear scale to a smaller bark scale is
// straightforward. We do *not* make sure that the linear mapping
// does not skip bark-scale bins; the decoder simply skips them and
// the encoder may do what it wishes in filling them. They're
// necessary in some mapping combinations to keep the scale spacing
// accurate
look.linearmap = new int[look.n];
for (int j = 0; j < look.n; j++) {
int val = (int) Math.floor(toBARK((float) ((info.rate / 2.) / look.n * j)) * scale); // bark numbers represent band edges
if (val >= look.ln)
val = look.ln; // guard against the approximation
look.linearmap[j] = val;
}
return look;
}
static float toBARK(float f) {
return (float) (13.1 * Math.atan(.00074 * (f)) + 2.24 * Math.atan((f) * (f) * 1.85e-8) + 1e-4 * (f));
}
Object state(Object i) {
EchstateFloor0 state = new EchstateFloor0();
InfoFloor0 info = (InfoFloor0) i;
// a safe size if usually too big (dim==1)
state.codewords = new int[info.order];
state.curve = new float[info.barkmap];
state.frameno = -1;
return (state);
}
void free_info(Object i) {
}
void free_look(Object i) {
}
void free_state(Object vs) {
}
int forward(Block vb, Object i, float[] in, float[] out, Object vs) {
return 0;
}
float[] lsp = null;
int inverse(Block vb, Object i, float[] out) {
//System.err.println("Floor0.inverse "+i.getClass()+"]");
LookFloor0 look = (LookFloor0) i;
InfoFloor0 info = look.vi;
int ampraw = vb.opb.read(info.ampbits);
if (ampraw > 0) { // also handles the -1 out of data case
int maxval = (1 << info.ampbits) - 1;
float amp = (float) ampraw / maxval * info.ampdB;
int booknum = vb.opb.read(Util.ilog(info.numbooks));
if (booknum != -1 && booknum < info.numbooks) {
synchronized (this) {
if (lsp == null || lsp.length < look.m) {
lsp = new float[look.m];
} else {
for (int j = 0; j < look.m; j++)
lsp[j] = 0.f;
}
CodeBook b = vb.vd.fullbooks[info.books[booknum]];
float last = 0.f;
for (int j = 0; j < look.m; j++)
out[j] = 0.0f;
for (int j = 0; j < look.m; j += b.dim) {
if (b.decodevs(lsp, j, vb.opb, 1, -1) == -1) {
for (int k = 0; k < look.n; k++)
out[k] = 0.0f;
return (0);
}
}
for (int j = 0; j < look.m;) {
for (int k = 0; k < b.dim; k++, j++)
lsp[j] += last;
last = lsp[j - 1];
}
// take the coefficients back to a spectral envelope curve
Lsp.lsp_to_curve(out, look.linearmap, look.n, look.ln, lsp, look.m,
amp, info.ampdB);
return (1);
}
}
}
return (0);
}
Object inverse1(Block vb, Object i, Object memo) {
LookFloor0 look = (LookFloor0) i;
InfoFloor0 info = look.vi;
float[] lsp = null;
if (memo instanceof float[]) {
lsp = (float[]) memo;
}
int ampraw = vb.opb.read(info.ampbits);
if (ampraw > 0) { // also handles the -1 out of data case
int maxval = (1 << info.ampbits) - 1;
float amp = (float) ampraw / maxval * info.ampdB;
int booknum = vb.opb.read(Util.ilog(info.numbooks));
if (booknum != -1 && booknum < info.numbooks) {
CodeBook b = vb.vd.fullbooks[info.books[booknum]];
float last = 0.f;
if (lsp == null || lsp.length < look.m + 1) {
lsp = new float[look.m + 1];
} else {
for (int j = 0; j < lsp.length; j++)
lsp[j] = 0.f;
}
for (int j = 0; j < look.m; j += b.dim) {
if (b.decodev_set(lsp, j, vb.opb, b.dim) == -1) {
return (null);
}
}
for (int j = 0; j < look.m;) {
for (int k = 0; k < b.dim; k++, j++)
lsp[j] += last;
last = lsp[j - 1];
}
lsp[look.m] = amp;
return (lsp);
}
}
return (null);
}
int inverse2(Block vb, Object i, Object memo, float[] out) {
LookFloor0 look = (LookFloor0) i;
InfoFloor0 info = look.vi;
if (memo != null) {
float[] lsp = (float[]) memo;
float amp = lsp[look.m];
Lsp.lsp_to_curve(out, look.linearmap, look.n, look.ln, lsp, look.m, amp,
info.ampdB);
return (1);
}
for (int j = 0; j < look.n; j++) {
out[j] = 0.f;
}
return (0);
}
static float fromdB(float x) {
return (float) (Math.exp((x) * .11512925));
}
static void lsp_to_lpc(float[] lsp, float[] lpc, int m) {
int i, j, m2 = m / 2;
float[] O = new float[m2];
float[] E = new float[m2];
float A;
float[] Ae = new float[m2 + 1];
float[] Ao = new float[m2 + 1];
float B;
float[] Be = new float[m2];
float[] Bo = new float[m2];
float temp;
// even/odd roots setup
for (i = 0; i < m2; i++) {
O[i] = (float) (-2. * Math.cos(lsp[i * 2]));
E[i] = (float) (-2. * Math.cos(lsp[i * 2 + 1]));
}
// set up impulse response
for (j = 0; j < m2; j++) {
Ae[j] = 0.f;
Ao[j] = 1.f;
Be[j] = 0.f;
Bo[j] = 1.f;
}
Ao[j] = 1.f;
Ae[j] = 1.f;
// run impulse response
for (i = 1; i < m + 1; i++) {
A = B = 0.f;
for (j = 0; j < m2; j++) {
temp = O[j] * Ao[j] + Ae[j];
Ae[j] = Ao[j];
Ao[j] = A;
A += temp;
temp = E[j] * Bo[j] + Be[j];
Be[j] = Bo[j];
Bo[j] = B;
B += temp;
}
lpc[i - 1] = (A + Ao[j] + B - Ae[j]) / 2;
Ao[j] = A;
Ae[j] = B;
}
}
static void lpc_to_curve(float[] curve, float[] lpc, float amp, LookFloor0 l,
String name, int frameno) {
// l->m+1 must be less than l->ln, but guard in case we get a bad stream
float[] lcurve = new float[Math.max(l.ln * 2, l.m * 2 + 2)];
if (amp == 0) {
for (int j = 0; j < l.n; j++)
curve[j] = 0.0f;
return;
}
l.lpclook.lpc_to_curve(lcurve, lpc, amp);
for (int i = 0; i < l.n; i++)
curve[i] = lcurve[l.linearmap[i]];
}
class InfoFloor0 {
int order;
int rate;
int barkmap;
int ampbits;
int ampdB;
int numbooks; // <= 16
int[] books = new int[16];
}
class LookFloor0 {
int n;
int ln;
int m;
int[] linearmap;
InfoFloor0 vi;
Lpc lpclook = new Lpc();
}
class EchstateFloor0 {
int[] codewords;
float[] curve;
long frameno;
long codes;
}
}