995dcb610c
Took the opportunity to undo the Godot changed made to the
opus source. The opus module should eventually be built in its
own environment to avoid polluting others with too many include
dirs and defines.
TODO: Fix the platform/ stuff for opus.
(cherry picked from commit d9a291f641)
speex module was only added while cherry-picking, as speex is removed
in the master branch but we don't want to break compatibility in 2.1.x.
Unbundling wasn't done as the module uses the internal speex_free,
so it would require some more work.
296 lines
9.6 KiB
C
296 lines
9.6 KiB
C
/* Copyright (C) 2002 Jean-Marc Valin
|
|
File: stereo.c
|
|
|
|
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.
|
|
*/
|
|
|
|
|
|
#include "config.h"
|
|
|
|
|
|
#include <speex/speex_stereo.h>
|
|
#include <speex/speex_callbacks.h>
|
|
#include "math_approx.h"
|
|
#include "vq.h"
|
|
#include <math.h>
|
|
#include "os_support.h"
|
|
|
|
typedef struct RealSpeexStereoState {
|
|
spx_word32_t balance; /**< Left/right balance info */
|
|
spx_word32_t e_ratio; /**< Ratio of energies: E(left+right)/[E(left)+E(right)] */
|
|
spx_word32_t smooth_left; /**< Smoothed left channel gain */
|
|
spx_word32_t smooth_right; /**< Smoothed right channel gain */
|
|
spx_uint32_t reserved1; /**< Reserved for future use */
|
|
spx_int32_t reserved2; /**< Reserved for future use */
|
|
} RealSpeexStereoState;
|
|
|
|
|
|
/*float e_ratio_quant[4] = {1, 1.26, 1.587, 2};*/
|
|
#ifndef FIXED_POINT
|
|
static const float e_ratio_quant[4] = {.25f, .315f, .397f, .5f};
|
|
static const float e_ratio_quant_bounds[3] = {0.2825f, 0.356f, 0.4485f};
|
|
#else
|
|
static const spx_word16_t e_ratio_quant[4] = {8192, 10332, 13009, 16384};
|
|
static const spx_word16_t e_ratio_quant_bounds[3] = {9257, 11665, 14696};
|
|
static const spx_word16_t balance_bounds[31] = {18, 23, 30, 38, 49, 63, 81, 104,
|
|
134, 172, 221, 284, 364, 468, 600, 771,
|
|
990, 1271, 1632, 2096, 2691, 3455, 4436, 5696,
|
|
7314, 9392, 12059, 15484, 19882, 25529, 32766};
|
|
#endif
|
|
|
|
/* This is an ugly compatibility hack that properly resets the stereo state
|
|
In case it it compiled in fixed-point, but initialised with the deprecated
|
|
floating point static initialiser */
|
|
#ifdef FIXED_POINT
|
|
#define COMPATIBILITY_HACK(s) do {if ((s)->reserved1 != 0xdeadbeef) speex_stereo_state_reset((SpeexStereoState*)s); } while (0);
|
|
#else
|
|
#define COMPATIBILITY_HACK(s)
|
|
#endif
|
|
|
|
EXPORT SpeexStereoState *speex_stereo_state_init()
|
|
{
|
|
SpeexStereoState *stereo = speex_alloc(sizeof(SpeexStereoState));
|
|
speex_stereo_state_reset(stereo);
|
|
return stereo;
|
|
}
|
|
|
|
EXPORT void speex_stereo_state_reset(SpeexStereoState *_stereo)
|
|
{
|
|
RealSpeexStereoState *stereo = (RealSpeexStereoState*)_stereo;
|
|
#ifdef FIXED_POINT
|
|
stereo->balance = 65536;
|
|
stereo->e_ratio = 16384;
|
|
stereo->smooth_left = 16384;
|
|
stereo->smooth_right = 16384;
|
|
stereo->reserved1 = 0xdeadbeef;
|
|
stereo->reserved2 = 0;
|
|
#else
|
|
stereo->balance = 1.0f;
|
|
stereo->e_ratio = .5f;
|
|
stereo->smooth_left = 1.f;
|
|
stereo->smooth_right = 1.f;
|
|
stereo->reserved1 = 0;
|
|
stereo->reserved2 = 0;
|
|
#endif
|
|
}
|
|
|
|
EXPORT void speex_stereo_state_destroy(SpeexStereoState *stereo)
|
|
{
|
|
speex_free(stereo);
|
|
}
|
|
|
|
#ifndef DISABLE_FLOAT_API
|
|
EXPORT void speex_encode_stereo(float *data, int frame_size, SpeexBits *bits)
|
|
{
|
|
int i, tmp;
|
|
float e_left=0, e_right=0, e_tot=0;
|
|
float balance, e_ratio;
|
|
for (i=0;i<frame_size;i++)
|
|
{
|
|
e_left += ((float)data[2*i])*data[2*i];
|
|
e_right += ((float)data[2*i+1])*data[2*i+1];
|
|
data[i] = .5*(((float)data[2*i])+data[2*i+1]);
|
|
e_tot += ((float)data[i])*data[i];
|
|
}
|
|
balance=(e_left+1)/(e_right+1);
|
|
e_ratio = e_tot/(1+e_left+e_right);
|
|
|
|
/*Quantization*/
|
|
speex_bits_pack(bits, 14, 5);
|
|
speex_bits_pack(bits, SPEEX_INBAND_STEREO, 4);
|
|
|
|
balance=4*log(balance);
|
|
|
|
/*Pack sign*/
|
|
if (balance>0)
|
|
speex_bits_pack(bits, 0, 1);
|
|
else
|
|
speex_bits_pack(bits, 1, 1);
|
|
balance=floor(.5+fabs(balance));
|
|
if (balance>30)
|
|
balance=31;
|
|
|
|
speex_bits_pack(bits, (int)balance, 5);
|
|
|
|
/* FIXME: this is a hack */
|
|
tmp=scal_quant(e_ratio*Q15_ONE, e_ratio_quant_bounds, 4);
|
|
speex_bits_pack(bits, tmp, 2);
|
|
}
|
|
#endif /* #ifndef DISABLE_FLOAT_API */
|
|
|
|
EXPORT void speex_encode_stereo_int(spx_int16_t *data, int frame_size, SpeexBits *bits)
|
|
{
|
|
int i, tmp;
|
|
spx_word32_t e_left=0, e_right=0, e_tot=0;
|
|
spx_word32_t balance, e_ratio;
|
|
spx_word32_t largest, smallest;
|
|
int balance_id;
|
|
#ifdef FIXED_POINT
|
|
int shift;
|
|
#endif
|
|
|
|
/* In band marker */
|
|
speex_bits_pack(bits, 14, 5);
|
|
/* Stereo marker */
|
|
speex_bits_pack(bits, SPEEX_INBAND_STEREO, 4);
|
|
|
|
for (i=0;i<frame_size;i++)
|
|
{
|
|
e_left += SHR32(MULT16_16(data[2*i],data[2*i]),8);
|
|
e_right += SHR32(MULT16_16(data[2*i+1],data[2*i+1]),8);
|
|
#ifdef FIXED_POINT
|
|
/* I think this is actually unbiased */
|
|
data[i] = SHR16(data[2*i],1)+PSHR16(data[2*i+1],1);
|
|
#else
|
|
data[i] = .5*(((float)data[2*i])+data[2*i+1]);
|
|
#endif
|
|
e_tot += SHR32(MULT16_16(data[i],data[i]),8);
|
|
}
|
|
if (e_left > e_right)
|
|
{
|
|
speex_bits_pack(bits, 0, 1);
|
|
largest = e_left;
|
|
smallest = e_right;
|
|
} else {
|
|
speex_bits_pack(bits, 1, 1);
|
|
largest = e_right;
|
|
smallest = e_left;
|
|
}
|
|
|
|
/* Balance quantization */
|
|
#ifdef FIXED_POINT
|
|
shift = spx_ilog2(largest)-15;
|
|
largest = VSHR32(largest, shift-4);
|
|
smallest = VSHR32(smallest, shift);
|
|
balance = DIV32(largest, ADD32(smallest, 1));
|
|
if (balance > 32767)
|
|
balance = 32767;
|
|
balance_id = scal_quant(EXTRACT16(balance), balance_bounds, 32);
|
|
#else
|
|
balance=(largest+1.)/(smallest+1.);
|
|
balance=4*log(balance);
|
|
balance_id=floor(.5+fabs(balance));
|
|
if (balance_id>30)
|
|
balance_id=31;
|
|
#endif
|
|
|
|
speex_bits_pack(bits, balance_id, 5);
|
|
|
|
/* "coherence" quantisation */
|
|
#ifdef FIXED_POINT
|
|
shift = spx_ilog2(e_tot);
|
|
e_tot = VSHR32(e_tot, shift-25);
|
|
e_left = VSHR32(e_left, shift-10);
|
|
e_right = VSHR32(e_right, shift-10);
|
|
e_ratio = DIV32(e_tot, e_left+e_right+1);
|
|
#else
|
|
e_ratio = e_tot/(1.+e_left+e_right);
|
|
#endif
|
|
|
|
tmp=scal_quant(EXTRACT16(e_ratio), e_ratio_quant_bounds, 4);
|
|
/*fprintf (stderr, "%d %d %d %d\n", largest, smallest, balance_id, e_ratio);*/
|
|
speex_bits_pack(bits, tmp, 2);
|
|
}
|
|
|
|
#ifndef DISABLE_FLOAT_API
|
|
EXPORT void speex_decode_stereo(float *data, int frame_size, SpeexStereoState *_stereo)
|
|
{
|
|
int i;
|
|
spx_word32_t balance;
|
|
spx_word16_t e_left, e_right, e_ratio;
|
|
RealSpeexStereoState *stereo = (RealSpeexStereoState*)_stereo;
|
|
|
|
COMPATIBILITY_HACK(stereo);
|
|
|
|
balance=stereo->balance;
|
|
e_ratio=stereo->e_ratio;
|
|
|
|
/* These two are Q14, with max value just below 2. */
|
|
e_right = DIV32(QCONST32(1., 22), spx_sqrt(MULT16_32_Q15(e_ratio, ADD32(QCONST32(1., 16), balance))));
|
|
e_left = SHR32(MULT16_16(spx_sqrt(balance), e_right), 8);
|
|
|
|
for (i=frame_size-1;i>=0;i--)
|
|
{
|
|
spx_word16_t tmp=data[i];
|
|
stereo->smooth_left = EXTRACT16(PSHR32(MAC16_16(MULT16_16(stereo->smooth_left, QCONST16(0.98, 15)), e_left, QCONST16(0.02, 15)), 15));
|
|
stereo->smooth_right = EXTRACT16(PSHR32(MAC16_16(MULT16_16(stereo->smooth_right, QCONST16(0.98, 15)), e_right, QCONST16(0.02, 15)), 15));
|
|
data[2*i] = (float)MULT16_16_P14(stereo->smooth_left, tmp);
|
|
data[2*i+1] = (float)MULT16_16_P14(stereo->smooth_right, tmp);
|
|
}
|
|
}
|
|
#endif /* #ifndef DISABLE_FLOAT_API */
|
|
|
|
EXPORT void speex_decode_stereo_int(spx_int16_t *data, int frame_size, SpeexStereoState *_stereo)
|
|
{
|
|
int i;
|
|
spx_word32_t balance;
|
|
spx_word16_t e_left, e_right, e_ratio;
|
|
RealSpeexStereoState *stereo = (RealSpeexStereoState*)_stereo;
|
|
|
|
COMPATIBILITY_HACK(stereo);
|
|
|
|
balance=stereo->balance;
|
|
e_ratio=stereo->e_ratio;
|
|
|
|
/* These two are Q14, with max value just below 2. */
|
|
e_right = DIV32(QCONST32(1., 22), spx_sqrt(MULT16_32_Q15(e_ratio, ADD32(QCONST32(1., 16), balance))));
|
|
e_left = SHR32(MULT16_16(spx_sqrt(balance), e_right), 8);
|
|
|
|
for (i=frame_size-1;i>=0;i--)
|
|
{
|
|
spx_int16_t tmp=data[i];
|
|
stereo->smooth_left = EXTRACT16(PSHR32(MAC16_16(MULT16_16(stereo->smooth_left, QCONST16(0.98, 15)), e_left, QCONST16(0.02, 15)), 15));
|
|
stereo->smooth_right = EXTRACT16(PSHR32(MAC16_16(MULT16_16(stereo->smooth_right, QCONST16(0.98, 15)), e_right, QCONST16(0.02, 15)), 15));
|
|
data[2*i] = (spx_int16_t)MULT16_16_P14(stereo->smooth_left, tmp);
|
|
data[2*i+1] = (spx_int16_t)MULT16_16_P14(stereo->smooth_right, tmp);
|
|
}
|
|
}
|
|
|
|
EXPORT int speex_std_stereo_request_handler(SpeexBits *bits, void *state, void *data)
|
|
{
|
|
RealSpeexStereoState *stereo;
|
|
spx_word16_t sign=1, dexp;
|
|
int tmp;
|
|
|
|
stereo = (RealSpeexStereoState*)data;
|
|
|
|
COMPATIBILITY_HACK(stereo);
|
|
|
|
if (speex_bits_unpack_unsigned(bits, 1))
|
|
sign=-1;
|
|
dexp = speex_bits_unpack_unsigned(bits, 5);
|
|
#ifndef FIXED_POINT
|
|
stereo->balance = exp(sign*.25*dexp);
|
|
#else
|
|
stereo->balance = spx_exp(MULT16_16(sign, SHL16(dexp, 9)));
|
|
#endif
|
|
tmp = speex_bits_unpack_unsigned(bits, 2);
|
|
stereo->e_ratio = e_ratio_quant[tmp];
|
|
|
|
return 0;
|
|
}
|