+++ /dev/null
-/*
- * This source code is a product of Sun Microsystems, Inc. and is provided
- * for unrestricted use. Users may copy or modify this source code without
- * charge.
- *
- * SUN SOURCE CODE IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING
- * THE WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
- *
- * Sun source code is provided with no support and without any obligation on
- * the part of Sun Microsystems, Inc. to assist in its use, correction,
- * modification or enhancement.
- *
- * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
- * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY THIS SOFTWARE
- * OR ANY PART THEREOF.
- *
- * In no event will Sun Microsystems, Inc. be liable for any lost revenue
- * or profits or other special, indirect and consequential damages, even if
- * Sun has been advised of the possibility of such damages.
- *
- * Sun Microsystems, Inc.
- * 2550 Garcia Avenue
- * Mountain View, California 94043
- */
-
-/*
- * g72x.c
- *
- * Common routines for G.721 and G.723 conversions.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "g72x.h"
-#include "g72x_priv.h"
-
-static G72x_STATE * g72x_state_new (void) ;
-static int unpack_bytes (int bits, int blocksize, const unsigned char * block, short * samples) ;
-static int pack_bytes (int bits, const short * samples, unsigned char * block) ;
-
-static
-short power2 [15] =
-{ 1, 2, 4, 8, 0x10, 0x20, 0x40, 0x80,
- 0x100, 0x200, 0x400, 0x800, 0x1000, 0x2000, 0x4000
-} ;
-
-/*
- * quan()
- *
- * quantizes the input val against the table of size short integers.
- * It returns i if table[i - 1] <= val < table[i].
- *
- * Using linear search for simple coding.
- */
-static
-int quan (int val, short *table, int size)
-{
- int i;
-
- for (i = 0; i < size; i++)
- if (val < *table++)
- break;
- return (i);
-}
-
-/*
- * fmult()
- *
- * returns the integer product of the 14-bit integer "an" and
- * "floating point" representation (4-bit exponent, 6-bit mantessa) "srn".
- */
-static
-int fmult (int an, int srn)
-{
- short anmag, anexp, anmant;
- short wanexp, wanmant;
- short retval;
-
- anmag = (an > 0) ? an : ((-an) & 0x1FFF);
- anexp = quan(anmag, power2, 15) - 6;
- anmant = (anmag == 0) ? 32 :
- (anexp >= 0) ? anmag >> anexp : anmag << -anexp;
- wanexp = anexp + ((srn >> 6) & 0xF) - 13;
-
- /*
- ** The original was :
- ** wanmant = (anmant * (srn & 0x3F) + 0x30) >> 4 ;
- ** but could see no valid reason for the + 0x30.
- ** Removed it and it improved the SNR of the codec.
- */
-
- wanmant = (anmant * (srn & 0x3F)) >> 4 ;
-
- retval = (wanexp >= 0) ? ((wanmant << wanexp) & 0x7FFF) :
- (wanmant >> -wanexp);
-
- return (((an ^ srn) < 0) ? -retval : retval);
-}
-
-static G72x_STATE * g72x_state_new (void)
-{ return calloc (1, sizeof (G72x_STATE)) ;
-}
-
-/*
- * private_init_state()
- *
- * This routine initializes and/or resets the G72x_PRIVATE structure
- * pointed to by 'state_ptr'.
- * All the initial state values are specified in the CCITT G.721 document.
- */
-void private_init_state (G72x_STATE *state_ptr)
-{
- int cnta;
-
- state_ptr->yl = 34816;
- state_ptr->yu = 544;
- state_ptr->dms = 0;
- state_ptr->dml = 0;
- state_ptr->ap = 0;
- for (cnta = 0; cnta < 2; cnta++) {
- state_ptr->a[cnta] = 0;
- state_ptr->pk[cnta] = 0;
- state_ptr->sr[cnta] = 32;
- }
- for (cnta = 0; cnta < 6; cnta++) {
- state_ptr->b[cnta] = 0;
- state_ptr->dq[cnta] = 32;
- }
- state_ptr->td = 0;
-} /* private_init_state */
-
-struct g72x_state * g72x_reader_init (int codec, int *blocksize, int *samplesperblock)
-{ G72x_STATE *pstate ;
-
- if ((pstate = g72x_state_new ()) == NULL)
- return NULL ;
-
- private_init_state (pstate) ;
-
- pstate->encoder = NULL ;
-
- switch (codec)
- { case G723_16_BITS_PER_SAMPLE : /* 2 bits per sample. */
- pstate->decoder = g723_16_decoder ;
- *blocksize = G723_16_BYTES_PER_BLOCK ;
- *samplesperblock = G723_16_SAMPLES_PER_BLOCK ;
- pstate->codec_bits = 2 ;
- pstate->blocksize = G723_16_BYTES_PER_BLOCK ;
- pstate->samplesperblock = G723_16_SAMPLES_PER_BLOCK ;
- break ;
-
- case G723_24_BITS_PER_SAMPLE : /* 3 bits per sample. */
- pstate->decoder = g723_24_decoder ;
- *blocksize = G723_24_BYTES_PER_BLOCK ;
- *samplesperblock = G723_24_SAMPLES_PER_BLOCK ;
- pstate->codec_bits = 3 ;
- pstate->blocksize = G723_24_BYTES_PER_BLOCK ;
- pstate->samplesperblock = G723_24_SAMPLES_PER_BLOCK ;
- break ;
-
- case G721_32_BITS_PER_SAMPLE : /* 4 bits per sample. */
- pstate->decoder = g721_decoder ;
- *blocksize = G721_32_BYTES_PER_BLOCK ;
- *samplesperblock = G721_32_SAMPLES_PER_BLOCK ;
- pstate->codec_bits = 4 ;
- pstate->blocksize = G721_32_BYTES_PER_BLOCK ;
- pstate->samplesperblock = G721_32_SAMPLES_PER_BLOCK ;
- break ;
-
- case G721_40_BITS_PER_SAMPLE : /* 5 bits per sample. */
- pstate->decoder = g723_40_decoder ;
- *blocksize = G721_40_BYTES_PER_BLOCK ;
- *samplesperblock = G721_40_SAMPLES_PER_BLOCK ;
- pstate->codec_bits = 5 ;
- pstate->blocksize = G721_40_BYTES_PER_BLOCK ;
- pstate->samplesperblock = G721_40_SAMPLES_PER_BLOCK ;
- break ;
-
- default :
- free (pstate) ;
- return NULL ;
- } ;
-
- return pstate ;
-} /* g72x_reader_init */
-
-struct g72x_state * g72x_writer_init (int codec, int *blocksize, int *samplesperblock)
-{ G72x_STATE *pstate ;
-
- if ((pstate = g72x_state_new ()) == NULL)
- return NULL ;
-
- private_init_state (pstate) ;
- pstate->decoder = NULL ;
-
- switch (codec)
- { case G723_16_BITS_PER_SAMPLE : /* 2 bits per sample. */
- pstate->encoder = g723_16_encoder ;
- *blocksize = G723_16_BYTES_PER_BLOCK ;
- *samplesperblock = G723_16_SAMPLES_PER_BLOCK ;
- pstate->codec_bits = 2 ;
- pstate->blocksize = G723_16_BYTES_PER_BLOCK ;
- pstate->samplesperblock = G723_16_SAMPLES_PER_BLOCK ;
- break ;
-
- case G723_24_BITS_PER_SAMPLE : /* 3 bits per sample. */
- pstate->encoder = g723_24_encoder ;
- *blocksize = G723_24_BYTES_PER_BLOCK ;
- *samplesperblock = G723_24_SAMPLES_PER_BLOCK ;
- pstate->codec_bits = 3 ;
- pstate->blocksize = G723_24_BYTES_PER_BLOCK ;
- pstate->samplesperblock = G723_24_SAMPLES_PER_BLOCK ;
- break ;
-
- case G721_32_BITS_PER_SAMPLE : /* 4 bits per sample. */
- pstate->encoder = g721_encoder ;
- *blocksize = G721_32_BYTES_PER_BLOCK ;
- *samplesperblock = G721_32_SAMPLES_PER_BLOCK ;
- pstate->codec_bits = 4 ;
- pstate->blocksize = G721_32_BYTES_PER_BLOCK ;
- pstate->samplesperblock = G721_32_SAMPLES_PER_BLOCK ;
- break ;
-
- case G721_40_BITS_PER_SAMPLE : /* 5 bits per sample. */
- pstate->encoder = g723_40_encoder ;
- *blocksize = G721_40_BYTES_PER_BLOCK ;
- *samplesperblock = G721_40_SAMPLES_PER_BLOCK ;
- pstate->codec_bits = 5 ;
- pstate->blocksize = G721_40_BYTES_PER_BLOCK ;
- pstate->samplesperblock = G721_40_SAMPLES_PER_BLOCK ;
- break ;
-
- default :
- free (pstate) ;
- return NULL ;
- } ;
-
- return pstate ;
-} /* g72x_writer_init */
-
-int g72x_decode_block (G72x_STATE *pstate, const unsigned char *block, short *samples)
-{ int k, count ;
-
- count = unpack_bytes (pstate->codec_bits, pstate->blocksize, block, samples) ;
-
- for (k = 0 ; k < count ; k++)
- samples [k] = pstate->decoder (samples [k], pstate) ;
-
- return 0 ;
-} /* g72x_decode_block */
-
-int g72x_encode_block (G72x_STATE *pstate, short *samples, unsigned char *block)
-{ int k, count ;
-
- for (k = 0 ; k < pstate->samplesperblock ; k++)
- samples [k] = pstate->encoder (samples [k], pstate) ;
-
- count = pack_bytes (pstate->codec_bits, samples, block) ;
-
- return count ;
-} /* g72x_encode_block */
-
-/*
- * predictor_zero()
- *
- * computes the estimated signal from 6-zero predictor.
- *
- */
-int predictor_zero (G72x_STATE *state_ptr)
-{
- int i;
- int sezi;
-
- sezi = fmult(state_ptr->b[0] >> 2, state_ptr->dq[0]);
- for (i = 1; i < 6; i++) /* ACCUM */
- sezi += fmult(state_ptr->b[i] >> 2, state_ptr->dq[i]);
- return (sezi);
-}
-/*
- * predictor_pole()
- *
- * computes the estimated signal from 2-pole predictor.
- *
- */
-int predictor_pole(G72x_STATE *state_ptr)
-{
- return (fmult(state_ptr->a[1] >> 2, state_ptr->sr[1]) +
- fmult(state_ptr->a[0] >> 2, state_ptr->sr[0]));
-}
-/*
- * step_size()
- *
- * computes the quantization step size of the adaptive quantizer.
- *
- */
-int step_size (G72x_STATE *state_ptr)
-{
- int y;
- int dif;
- int al;
-
- if (state_ptr->ap >= 256)
- return (state_ptr->yu);
- else {
- y = state_ptr->yl >> 6;
- dif = state_ptr->yu - y;
- al = state_ptr->ap >> 2;
- if (dif > 0)
- y += (dif * al) >> 6;
- else if (dif < 0)
- y += (dif * al + 0x3F) >> 6;
- return (y);
- }
-}
-
-/*
- * quantize()
- *
- * Given a raw sample, 'd', of the difference signal and a
- * quantization step size scale factor, 'y', this routine returns the
- * ADPCM codeword to which that sample gets quantized. The step
- * size scale factor division operation is done in the log base 2 domain
- * as a subtraction.
- */
-int quantize(
- int d, /* Raw difference signal sample */
- int y, /* Step size multiplier */
- short *table, /* quantization table */
- int size) /* table size of short integers */
-{
- short dqm; /* Magnitude of 'd' */
- short expon; /* Integer part of base 2 log of 'd' */
- short mant; /* Fractional part of base 2 log */
- short dl; /* Log of magnitude of 'd' */
- short dln; /* Step size scale factor normalized log */
- int i;
-
- /*
- * LOG
- *
- * Compute base 2 log of 'd', and store in 'dl'.
- */
- dqm = abs(d);
- expon = quan(dqm >> 1, power2, 15);
- mant = ((dqm << 7) >> expon) & 0x7F; /* Fractional portion. */
- dl = (expon << 7) + mant;
-
- /*
- * SUBTB
- *
- * "Divide" by step size multiplier.
- */
- dln = dl - (y >> 2);
-
- /*
- * QUAN
- *
- * Obtain codword i for 'd'.
- */
- i = quan(dln, table, size);
- if (d < 0) /* take 1's complement of i */
- return ((size << 1) + 1 - i);
- else if (i == 0) /* take 1's complement of 0 */
- return ((size << 1) + 1); /* new in 1988 */
- else
- return (i);
-}
-/*
- * reconstruct()
- *
- * Returns reconstructed difference signal 'dq' obtained from
- * codeword 'i' and quantization step size scale factor 'y'.
- * Multiplication is performed in log base 2 domain as addition.
- */
-int
-reconstruct(
- int sign, /* 0 for non-negative value */
- int dqln, /* G.72x codeword */
- int y) /* Step size multiplier */
-{
- short dql; /* Log of 'dq' magnitude */
- short dex; /* Integer part of log */
- short dqt;
- short dq; /* Reconstructed difference signal sample */
-
- dql = dqln + (y >> 2); /* ADDA */
-
- if (dql < 0) {
- return ((sign) ? -0x8000 : 0);
- } else { /* ANTILOG */
- dex = (dql >> 7) & 15;
- dqt = 128 + (dql & 127);
- dq = (dqt << 7) >> (14 - dex);
- return ((sign) ? (dq - 0x8000) : dq);
- }
-}
-
-
-/*
- * update()
- *
- * updates the state variables for each output code
- */
-void
-update(
- int code_size, /* distinguish 723_40 with others */
- int y, /* quantizer step size */
- int wi, /* scale factor multiplier */
- int fi, /* for long/short term energies */
- int dq, /* quantized prediction difference */
- int sr, /* reconstructed signal */
- int dqsez, /* difference from 2-pole predictor */
- G72x_STATE *state_ptr) /* coder state pointer */
-{
- int cnt;
- short mag, expon; /* Adaptive predictor, FLOAT A */
- short a2p = 0; /* LIMC */
- short a1ul; /* UPA1 */
- short pks1; /* UPA2 */
- short fa1;
- char tr; /* tone/transition detector */
- short ylint, thr2, dqthr;
- short ylfrac, thr1;
- short pk0;
-
- pk0 = (dqsez < 0) ? 1 : 0; /* needed in updating predictor poles */
-
- mag = dq & 0x7FFF; /* prediction difference magnitude */
- /* TRANS */
- ylint = state_ptr->yl >> 15; /* exponent part of yl */
- ylfrac = (state_ptr->yl >> 10) & 0x1F; /* fractional part of yl */
- thr1 = (32 + ylfrac) << ylint; /* threshold */
- thr2 = (ylint > 9) ? 31 << 10 : thr1; /* limit thr2 to 31 << 10 */
- dqthr = (thr2 + (thr2 >> 1)) >> 1; /* dqthr = 0.75 * thr2 */
- if (state_ptr->td == 0) /* signal supposed voice */
- tr = 0;
- else if (mag <= dqthr) /* supposed data, but small mag */
- tr = 0; /* treated as voice */
- else /* signal is data (modem) */
- tr = 1;
-
- /*
- * Quantizer scale factor adaptation.
- */
-
- /* FUNCTW & FILTD & DELAY */
- /* update non-steady state step size multiplier */
- state_ptr->yu = y + ((wi - y) >> 5);
-
- /* LIMB */
- if (state_ptr->yu < 544) /* 544 <= yu <= 5120 */
- state_ptr->yu = 544;
- else if (state_ptr->yu > 5120)
- state_ptr->yu = 5120;
-
- /* FILTE & DELAY */
- /* update steady state step size multiplier */
- state_ptr->yl += state_ptr->yu + ((-state_ptr->yl) >> 6);
-
- /*
- * Adaptive predictor coefficients.
- */
- if (tr == 1) { /* reset a's and b's for modem signal */
- state_ptr->a[0] = 0;
- state_ptr->a[1] = 0;
- state_ptr->b[0] = 0;
- state_ptr->b[1] = 0;
- state_ptr->b[2] = 0;
- state_ptr->b[3] = 0;
- state_ptr->b[4] = 0;
- state_ptr->b[5] = 0;
- } else { /* update a's and b's */
- pks1 = pk0 ^ state_ptr->pk[0]; /* UPA2 */
-
- /* update predictor pole a[1] */
- a2p = state_ptr->a[1] - (state_ptr->a[1] >> 7);
- if (dqsez != 0) {
- fa1 = (pks1) ? state_ptr->a[0] : -state_ptr->a[0];
- if (fa1 < -8191) /* a2p = function of fa1 */
- a2p -= 0x100;
- else if (fa1 > 8191)
- a2p += 0xFF;
- else
- a2p += fa1 >> 5;
-
- if (pk0 ^ state_ptr->pk[1])
- { /* LIMC */
- if (a2p <= -12160)
- a2p = -12288;
- else if (a2p >= 12416)
- a2p = 12288;
- else
- a2p -= 0x80;
- }
- else if (a2p <= -12416)
- a2p = -12288;
- else if (a2p >= 12160)
- a2p = 12288;
- else
- a2p += 0x80;
- }
-
- /* TRIGB & DELAY */
- state_ptr->a[1] = a2p;
-
- /* UPA1 */
- /* update predictor pole a[0] */
- state_ptr->a[0] -= state_ptr->a[0] >> 8;
- if (dqsez != 0)
- { if (pks1 == 0)
- state_ptr->a[0] += 192;
- else
- state_ptr->a[0] -= 192;
- } ;
-
- /* LIMD */
- a1ul = 15360 - a2p;
- if (state_ptr->a[0] < -a1ul)
- state_ptr->a[0] = -a1ul;
- else if (state_ptr->a[0] > a1ul)
- state_ptr->a[0] = a1ul;
-
- /* UPB : update predictor zeros b[6] */
- for (cnt = 0; cnt < 6; cnt++) {
- if (code_size == 5) /* for 40Kbps G.723 */
- state_ptr->b[cnt] -= state_ptr->b[cnt] >> 9;
- else /* for G.721 and 24Kbps G.723 */
- state_ptr->b[cnt] -= state_ptr->b[cnt] >> 8;
- if (dq & 0x7FFF) { /* XOR */
- if ((dq ^ state_ptr->dq[cnt]) >= 0)
- state_ptr->b[cnt] += 128;
- else
- state_ptr->b[cnt] -= 128;
- }
- }
- }
-
- for (cnt = 5; cnt > 0; cnt--)
- state_ptr->dq[cnt] = state_ptr->dq[cnt-1];
- /* FLOAT A : convert dq[0] to 4-bit exp, 6-bit mantissa f.p. */
- if (mag == 0) {
- state_ptr->dq[0] = (dq >= 0) ? 0x20 : 0xFC20;
- } else {
- expon = quan(mag, power2, 15);
- state_ptr->dq[0] = (dq >= 0) ?
- (expon << 6) + ((mag << 6) >> expon) :
- (expon << 6) + ((mag << 6) >> expon) - 0x400;
- }
-
- state_ptr->sr[1] = state_ptr->sr[0];
- /* FLOAT B : convert sr to 4-bit exp., 6-bit mantissa f.p. */
- if (sr == 0) {
- state_ptr->sr[0] = 0x20;
- } else if (sr > 0) {
- expon = quan(sr, power2, 15);
- state_ptr->sr[0] = (expon << 6) + ((sr << 6) >> expon);
- } else if (sr > -32768) {
- mag = -sr;
- expon = quan(mag, power2, 15);
- state_ptr->sr[0] = (expon << 6) + ((mag << 6) >> expon) - 0x400;
- } else
- state_ptr->sr[0] = (short) 0xFC20;
-
- /* DELAY A */
- state_ptr->pk[1] = state_ptr->pk[0];
- state_ptr->pk[0] = pk0;
-
- /* TONE */
- if (tr == 1) /* this sample has been treated as data */
- state_ptr->td = 0; /* next one will be treated as voice */
- else if (a2p < -11776) /* small sample-to-sample correlation */
- state_ptr->td = 1; /* signal may be data */
- else /* signal is voice */
- state_ptr->td = 0;
-
- /*
- * Adaptation speed control.
- */
- state_ptr->dms += (fi - state_ptr->dms) >> 5; /* FILTA */
- state_ptr->dml += (((fi << 2) - state_ptr->dml) >> 7); /* FILTB */
-
- if (tr == 1)
- state_ptr->ap = 256;
- else if (y < 1536) /* SUBTC */
- state_ptr->ap += (0x200 - state_ptr->ap) >> 4;
- else if (state_ptr->td == 1)
- state_ptr->ap += (0x200 - state_ptr->ap) >> 4;
- else if (abs((state_ptr->dms << 2) - state_ptr->dml) >=
- (state_ptr->dml >> 3))
- state_ptr->ap += (0x200 - state_ptr->ap) >> 4;
- else
- state_ptr->ap += (-state_ptr->ap) >> 4;
-
- return ;
-} /* update */
-
-/*------------------------------------------------------------------------------
-*/
-
-static int
-unpack_bytes (int bits, int blocksize, const unsigned char * block, short * samples)
-{ unsigned int in_buffer = 0 ;
- unsigned char in_byte ;
- int k, in_bits = 0, bindex = 0 ;
-
- for (k = 0 ; bindex <= blocksize && k < G72x_BLOCK_SIZE ; k++)
- { if (in_bits < bits)
- { in_byte = block [bindex++] ;
-
- in_buffer |= (in_byte << in_bits);
- in_bits += 8;
- }
- samples [k] = in_buffer & ((1 << bits) - 1);
- in_buffer >>= bits;
- in_bits -= bits;
- } ;
-
- return k ;
-} /* unpack_bytes */
-
-static int
-pack_bytes (int bits, const short * samples, unsigned char * block)
-{
- unsigned int out_buffer = 0 ;
- int k, bindex = 0, out_bits = 0 ;
- unsigned char out_byte ;
-
- for (k = 0 ; k < G72x_BLOCK_SIZE ; k++)
- { out_buffer |= (samples [k] << out_bits) ;
- out_bits += bits ;
- if (out_bits >= 8)
- { out_byte = out_buffer & 0xFF ;
- out_bits -= 8 ;
- out_buffer >>= 8 ;
- block [bindex++] = out_byte ;
- }
- } ;
-
- return bindex ;
-} /* pack_bytes */
-
projects / Faustine.git / blobdiff
