/* 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 SpeexStereoState *speex_stereo_state_init() { SpeexStereoState *stereo = speex_alloc(sizeof(SpeexStereoState)); speex_stereo_state_reset(stereo); return stereo; } 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 } void speex_stereo_state_destroy(SpeexStereoState *stereo) { speex_free(stereo); } #ifndef DISABLE_FLOAT_API 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 */ 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 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 */ 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); } } 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; }