297 lines
9.7 KiB
C
297 lines
9.7 KiB
C
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/* Copyright (C) 2002 Jean-Marc Valin
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File: stereo.c
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of the Xiph.org Foundation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <speex/speex_stereo.h>
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#include <speex/speex_callbacks.h>
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#include "math_approx.h"
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#include "vq.h"
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#include <math.h>
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#include "os_support.h"
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typedef struct RealSpeexStereoState {
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spx_word32_t balance; /**< Left/right balance info */
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spx_word32_t e_ratio; /**< Ratio of energies: E(left+right)/[E(left)+E(right)] */
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spx_word32_t smooth_left; /**< Smoothed left channel gain */
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spx_word32_t smooth_right; /**< Smoothed right channel gain */
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spx_uint32_t reserved1; /**< Reserved for future use */
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spx_int32_t reserved2; /**< Reserved for future use */
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} RealSpeexStereoState;
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/*float e_ratio_quant[4] = {1, 1.26, 1.587, 2};*/
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#ifndef FIXED_POINT
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static const float e_ratio_quant[4] = {.25f, .315f, .397f, .5f};
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static const float e_ratio_quant_bounds[3] = {0.2825f, 0.356f, 0.4485f};
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#else
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static const spx_word16_t e_ratio_quant[4] = {8192, 10332, 13009, 16384};
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static const spx_word16_t e_ratio_quant_bounds[3] = {9257, 11665, 14696};
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static const spx_word16_t balance_bounds[31] = {18, 23, 30, 38, 49, 63, 81, 104,
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134, 172, 221, 284, 364, 468, 600, 771,
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990, 1271, 1632, 2096, 2691, 3455, 4436, 5696,
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7314, 9392, 12059, 15484, 19882, 25529, 32766};
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#endif
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/* This is an ugly compatibility hack that properly resets the stereo state
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In case it it compiled in fixed-point, but initialised with the deprecated
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floating point static initialiser */
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#ifdef FIXED_POINT
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#define COMPATIBILITY_HACK(s) do {if ((s)->reserved1 != 0xdeadbeef) speex_stereo_state_reset((SpeexStereoState*)s); } while (0);
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#else
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#define COMPATIBILITY_HACK(s)
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#endif
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EXPORT SpeexStereoState *speex_stereo_state_init()
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{
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SpeexStereoState *stereo = speex_alloc(sizeof(SpeexStereoState));
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speex_stereo_state_reset(stereo);
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return stereo;
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}
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EXPORT void speex_stereo_state_reset(SpeexStereoState *_stereo)
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{
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RealSpeexStereoState *stereo = (RealSpeexStereoState*)_stereo;
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#ifdef FIXED_POINT
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stereo->balance = 65536;
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stereo->e_ratio = 16384;
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stereo->smooth_left = 16384;
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stereo->smooth_right = 16384;
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stereo->reserved1 = 0xdeadbeef;
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stereo->reserved2 = 0;
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#else
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stereo->balance = 1.0f;
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stereo->e_ratio = .5f;
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stereo->smooth_left = 1.f;
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stereo->smooth_right = 1.f;
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stereo->reserved1 = 0;
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stereo->reserved2 = 0;
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#endif
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}
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EXPORT void speex_stereo_state_destroy(SpeexStereoState *stereo)
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{
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speex_free(stereo);
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}
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#ifndef DISABLE_FLOAT_API
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EXPORT void speex_encode_stereo(float *data, int frame_size, SpeexBits *bits)
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{
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int i, tmp;
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float e_left=0, e_right=0, e_tot=0;
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float balance, e_ratio;
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for (i=0;i<frame_size;i++)
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{
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e_left += ((float)data[2*i])*data[2*i];
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e_right += ((float)data[2*i+1])*data[2*i+1];
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data[i] = .5*(((float)data[2*i])+data[2*i+1]);
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e_tot += ((float)data[i])*data[i];
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}
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balance=(e_left+1)/(e_right+1);
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e_ratio = e_tot/(1+e_left+e_right);
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/*Quantization*/
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speex_bits_pack(bits, 14, 5);
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speex_bits_pack(bits, SPEEX_INBAND_STEREO, 4);
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balance=4*log(balance);
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/*Pack sign*/
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if (balance>0)
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speex_bits_pack(bits, 0, 1);
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else
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speex_bits_pack(bits, 1, 1);
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balance=floor(.5+fabs(balance));
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if (balance>30)
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balance=31;
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speex_bits_pack(bits, (int)balance, 5);
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/* FIXME: this is a hack */
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tmp=scal_quant(e_ratio*Q15_ONE, e_ratio_quant_bounds, 4);
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speex_bits_pack(bits, tmp, 2);
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}
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#endif /* #ifndef DISABLE_FLOAT_API */
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EXPORT void speex_encode_stereo_int(spx_int16_t *data, int frame_size, SpeexBits *bits)
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{
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int i, tmp;
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spx_word32_t e_left=0, e_right=0, e_tot=0;
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spx_word32_t balance, e_ratio;
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spx_word32_t largest, smallest;
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int balance_id;
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#ifdef FIXED_POINT
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int shift;
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#endif
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/* In band marker */
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speex_bits_pack(bits, 14, 5);
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/* Stereo marker */
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speex_bits_pack(bits, SPEEX_INBAND_STEREO, 4);
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for (i=0;i<frame_size;i++)
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{
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e_left += SHR32(MULT16_16(data[2*i],data[2*i]),8);
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e_right += SHR32(MULT16_16(data[2*i+1],data[2*i+1]),8);
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#ifdef FIXED_POINT
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/* I think this is actually unbiased */
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data[i] = SHR16(data[2*i],1)+PSHR16(data[2*i+1],1);
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#else
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data[i] = .5*(((float)data[2*i])+data[2*i+1]);
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#endif
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e_tot += SHR32(MULT16_16(data[i],data[i]),8);
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}
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if (e_left > e_right)
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{
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speex_bits_pack(bits, 0, 1);
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largest = e_left;
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smallest = e_right;
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} else {
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speex_bits_pack(bits, 1, 1);
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largest = e_right;
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smallest = e_left;
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}
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/* Balance quantization */
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#ifdef FIXED_POINT
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shift = spx_ilog2(largest)-15;
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largest = VSHR32(largest, shift-4);
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smallest = VSHR32(smallest, shift);
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balance = DIV32(largest, ADD32(smallest, 1));
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if (balance > 32767)
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balance = 32767;
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balance_id = scal_quant(EXTRACT16(balance), balance_bounds, 32);
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#else
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balance=(largest+1.)/(smallest+1.);
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balance=4*log(balance);
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balance_id=floor(.5+fabs(balance));
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if (balance_id>30)
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balance_id=31;
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#endif
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speex_bits_pack(bits, balance_id, 5);
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/* "coherence" quantisation */
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#ifdef FIXED_POINT
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shift = spx_ilog2(e_tot);
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e_tot = VSHR32(e_tot, shift-25);
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e_left = VSHR32(e_left, shift-10);
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e_right = VSHR32(e_right, shift-10);
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e_ratio = DIV32(e_tot, e_left+e_right+1);
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#else
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e_ratio = e_tot/(1.+e_left+e_right);
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#endif
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tmp=scal_quant(EXTRACT16(e_ratio), e_ratio_quant_bounds, 4);
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/*fprintf (stderr, "%d %d %d %d\n", largest, smallest, balance_id, e_ratio);*/
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speex_bits_pack(bits, tmp, 2);
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}
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#ifndef DISABLE_FLOAT_API
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EXPORT void speex_decode_stereo(float *data, int frame_size, SpeexStereoState *_stereo)
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{
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int i;
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spx_word32_t balance;
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spx_word16_t e_left, e_right, e_ratio;
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RealSpeexStereoState *stereo = (RealSpeexStereoState*)_stereo;
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COMPATIBILITY_HACK(stereo);
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balance=stereo->balance;
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e_ratio=stereo->e_ratio;
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/* These two are Q14, with max value just below 2. */
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e_right = DIV32(QCONST32(1., 22), spx_sqrt(MULT16_32_Q15(e_ratio, ADD32(QCONST32(1., 16), balance))));
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e_left = SHR32(MULT16_16(spx_sqrt(balance), e_right), 8);
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for (i=frame_size-1;i>=0;i--)
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{
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spx_word16_t tmp=data[i];
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stereo->smooth_left = EXTRACT16(PSHR32(MAC16_16(MULT16_16(stereo->smooth_left, QCONST16(0.98, 15)), e_left, QCONST16(0.02, 15)), 15));
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stereo->smooth_right = EXTRACT16(PSHR32(MAC16_16(MULT16_16(stereo->smooth_right, QCONST16(0.98, 15)), e_right, QCONST16(0.02, 15)), 15));
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data[2*i] = (float)MULT16_16_P14(stereo->smooth_left, tmp);
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data[2*i+1] = (float)MULT16_16_P14(stereo->smooth_right, tmp);
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}
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}
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#endif /* #ifndef DISABLE_FLOAT_API */
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EXPORT void speex_decode_stereo_int(spx_int16_t *data, int frame_size, SpeexStereoState *_stereo)
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{
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int i;
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spx_word32_t balance;
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spx_word16_t e_left, e_right, e_ratio;
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RealSpeexStereoState *stereo = (RealSpeexStereoState*)_stereo;
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COMPATIBILITY_HACK(stereo);
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balance=stereo->balance;
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e_ratio=stereo->e_ratio;
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/* These two are Q14, with max value just below 2. */
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e_right = DIV32(QCONST32(1., 22), spx_sqrt(MULT16_32_Q15(e_ratio, ADD32(QCONST32(1., 16), balance))));
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e_left = SHR32(MULT16_16(spx_sqrt(balance), e_right), 8);
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for (i=frame_size-1;i>=0;i--)
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{
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spx_int16_t tmp=data[i];
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stereo->smooth_left = EXTRACT16(PSHR32(MAC16_16(MULT16_16(stereo->smooth_left, QCONST16(0.98, 15)), e_left, QCONST16(0.02, 15)), 15));
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stereo->smooth_right = EXTRACT16(PSHR32(MAC16_16(MULT16_16(stereo->smooth_right, QCONST16(0.98, 15)), e_right, QCONST16(0.02, 15)), 15));
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data[2*i] = (spx_int16_t)MULT16_16_P14(stereo->smooth_left, tmp);
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data[2*i+1] = (spx_int16_t)MULT16_16_P14(stereo->smooth_right, tmp);
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}
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}
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EXPORT int speex_std_stereo_request_handler(SpeexBits *bits, void *state, void *data)
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{
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RealSpeexStereoState *stereo;
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spx_word16_t sign=1, dexp;
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int tmp;
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stereo = (RealSpeexStereoState*)data;
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COMPATIBILITY_HACK(stereo);
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if (speex_bits_unpack_unsigned(bits, 1))
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sign=-1;
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dexp = speex_bits_unpack_unsigned(bits, 5);
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#ifndef FIXED_POINT
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stereo->balance = exp(sign*.25*dexp);
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#else
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stereo->balance = spx_exp(MULT16_16(sign, SHL16(dexp, 9)));
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#endif
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tmp = speex_bits_unpack_unsigned(bits, 2);
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stereo->e_ratio = e_ratio_quant[tmp];
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return 0;
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}
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