+++ /dev/null
-/* 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.
-*/
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#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;
-}
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