X-Git-Url: http://4ch.mooo.com/gitweb/?a=blobdiff_plain;f=src%2Flib%2Fdl%2Fext%2Fspeex%2Fstereo.c;fp=src%2Flib%2Fdl%2Fext%2Fspeex%2Fstereo.c;h=db5ea4a857e93b5ecea426169d084917b71fa7c2;hb=47cdc66151d973d975d0e31fb8a786eb639bebdb;hp=0000000000000000000000000000000000000000;hpb=4b23f27092a9470a741e3a18261ad389fd1929db;p=16.git diff --git a/src/lib/dl/ext/speex/stereo.c b/src/lib/dl/ext/speex/stereo.c new file mode 100755 index 00000000..db5ea4a8 --- /dev/null +++ b/src/lib/dl/ext/speex/stereo.c @@ -0,0 +1,296 @@ +/* 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 +#include +#include "math_approx.h" +#include "vq.h" +#include +#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;i0) + 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 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; +}