--- /dev/null
+/*
+** Copyright (C) 2002-2011 Erik de Castro Lopo <erikd@mega-nerd.com>
+**
+** This program is free software; you can redistribute it and/or modify
+** it under the terms of the GNU Lesser General Public License as published by
+** the Free Software Foundation; either version 2.1 of the License, or
+** (at your option) any later version.
+**
+** This program is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+** GNU Lesser General Public License for more details.
+**
+** You should have received a copy of the GNU Lesser General Public License
+** along with this program; if not, write to the Free Software
+** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+*/
+
+/*===========================================================================
+** Delta Word Variable Width
+**
+** This decoder and encoder were implemented using information found in this
+** document : http://home.swbell.net/rubywand/R011SNDFMTS.TXT
+**
+** According to the document, the algorithm "was invented 1991 by Magnus
+** Lidstrom and is copyright 1993 by NuEdge Development".
+*/
+
+#include "sfconfig.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+
+#include "sndfile.h"
+#include "sfendian.h"
+#include "common.h"
+
+typedef struct
+{ int dwm_maxsize, bit_width, max_delta, span ;
+ int samplecount ;
+ int bit_count, bits, last_delta_width, last_sample ;
+ struct
+ { int index, end ;
+ unsigned char buffer [256] ;
+ } b ;
+} DWVW_PRIVATE ;
+
+/*============================================================================================
+*/
+
+static sf_count_t dwvw_read_s (SF_PRIVATE *psf, short *ptr, sf_count_t len) ;
+static sf_count_t dwvw_read_i (SF_PRIVATE *psf, int *ptr, sf_count_t len) ;
+static sf_count_t dwvw_read_f (SF_PRIVATE *psf, float *ptr, sf_count_t len) ;
+static sf_count_t dwvw_read_d (SF_PRIVATE *psf, double *ptr, sf_count_t len) ;
+
+static sf_count_t dwvw_write_s (SF_PRIVATE *psf, const short *ptr, sf_count_t len) ;
+static sf_count_t dwvw_write_i (SF_PRIVATE *psf, const int *ptr, sf_count_t len) ;
+static sf_count_t dwvw_write_f (SF_PRIVATE *psf, const float *ptr, sf_count_t len) ;
+static sf_count_t dwvw_write_d (SF_PRIVATE *psf, const double *ptr, sf_count_t len) ;
+
+static sf_count_t dwvw_seek (SF_PRIVATE *psf, int mode, sf_count_t offset) ;
+static int dwvw_close (SF_PRIVATE *psf) ;
+
+static int dwvw_decode_data (SF_PRIVATE *psf, DWVW_PRIVATE *pdwvw, int *ptr, int len) ;
+static int dwvw_decode_load_bits (SF_PRIVATE *psf, DWVW_PRIVATE *pdwvw, int bit_count) ;
+
+static int dwvw_encode_data (SF_PRIVATE *psf, DWVW_PRIVATE *pdwvw, const int *ptr, int len) ;
+static void dwvw_encode_store_bits (SF_PRIVATE *psf, DWVW_PRIVATE *pdwvw, int data, int new_bits) ;
+static void dwvw_read_reset (DWVW_PRIVATE *pdwvw) ;
+
+/*============================================================================================
+** DWVW initialisation function.
+*/
+
+int
+dwvw_init (SF_PRIVATE *psf, int bitwidth)
+{ DWVW_PRIVATE *pdwvw ;
+
+ if (psf->codec_data != NULL)
+ { psf_log_printf (psf, "*** psf->codec_data is not NULL.\n") ;
+ return SFE_INTERNAL ;
+ } ;
+
+ if (bitwidth > 24)
+ return SFE_DWVW_BAD_BITWIDTH ;
+
+ if (psf->file.mode == SFM_RDWR)
+ return SFE_BAD_MODE_RW ;
+
+ if ((pdwvw = calloc (1, sizeof (DWVW_PRIVATE))) == NULL)
+ return SFE_MALLOC_FAILED ;
+
+ psf->codec_data = (void*) pdwvw ;
+
+ pdwvw->bit_width = bitwidth ;
+ pdwvw->dwm_maxsize = bitwidth / 2 ;
+ pdwvw->max_delta = 1 << (bitwidth - 1) ;
+ pdwvw->span = 1 << bitwidth ;
+
+ dwvw_read_reset (pdwvw) ;
+
+ if (psf->file.mode == SFM_READ)
+ { psf->read_short = dwvw_read_s ;
+ psf->read_int = dwvw_read_i ;
+ psf->read_float = dwvw_read_f ;
+ psf->read_double = dwvw_read_d ;
+ } ;
+
+ if (psf->file.mode == SFM_WRITE)
+ { psf->write_short = dwvw_write_s ;
+ psf->write_int = dwvw_write_i ;
+ psf->write_float = dwvw_write_f ;
+ psf->write_double = dwvw_write_d ;
+ } ;
+
+ psf->codec_close = dwvw_close ;
+ psf->seek = dwvw_seek ;
+
+ /* FIXME : This is bogus. */
+ psf->sf.frames = SF_COUNT_MAX ;
+ psf->datalength = psf->sf.frames ;
+ /* EMXIF : This is bogus. */
+
+ return 0 ;
+} /* dwvw_init */
+
+/*--------------------------------------------------------------------------------------------
+*/
+
+static int
+dwvw_close (SF_PRIVATE *psf)
+{ DWVW_PRIVATE *pdwvw ;
+
+ if (psf->codec_data == NULL)
+ return 0 ;
+ pdwvw = (DWVW_PRIVATE*) psf->codec_data ;
+
+ if (psf->file.mode == SFM_WRITE)
+ { static int last_values [12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } ;
+
+ /* Write 8 zero samples to fully flush output. */
+ dwvw_encode_data (psf, pdwvw, last_values, 12) ;
+
+ /* Write the last buffer worth of data to disk. */
+ psf_fwrite (pdwvw->b.buffer, 1, pdwvw->b.index, psf) ;
+
+ if (psf->write_header)
+ psf->write_header (psf, SF_TRUE) ;
+ } ;
+
+ return 0 ;
+} /* dwvw_close */
+
+static sf_count_t
+dwvw_seek (SF_PRIVATE *psf, int UNUSED (mode), sf_count_t offset)
+{ DWVW_PRIVATE *pdwvw ;
+
+ if (! psf->codec_data)
+ { psf->error = SFE_INTERNAL ;
+ return PSF_SEEK_ERROR ;
+ } ;
+
+ pdwvw = (DWVW_PRIVATE*) psf->codec_data ;
+
+ if (offset == 0)
+ { psf_fseek (psf, psf->dataoffset, SEEK_SET) ;
+ dwvw_read_reset (pdwvw) ;
+ return 0 ;
+ } ;
+
+ psf->error = SFE_BAD_SEEK ;
+ return PSF_SEEK_ERROR ;
+} /* dwvw_seek */
+
+
+/*==============================================================================
+*/
+
+static sf_count_t
+dwvw_read_s (SF_PRIVATE *psf, short *ptr, sf_count_t len)
+{ DWVW_PRIVATE *pdwvw ;
+ int *iptr ;
+ int k, bufferlen, readcount = 0, count ;
+ sf_count_t total = 0 ;
+
+ if (! psf->codec_data)
+ return 0 ;
+ pdwvw = (DWVW_PRIVATE*) psf->codec_data ;
+
+ iptr = psf->u.ibuf ;
+ bufferlen = ARRAY_LEN (psf->u.ibuf) ;
+ while (len > 0)
+ { readcount = (len >= bufferlen) ? bufferlen : len ;
+ count = dwvw_decode_data (psf, pdwvw, iptr, readcount) ;
+ for (k = 0 ; k < readcount ; k++)
+ ptr [total + k] = iptr [k] >> 16 ;
+
+ total += count ;
+ len -= readcount ;
+ if (count != readcount)
+ break ;
+ } ;
+
+ return total ;
+} /* dwvw_read_s */
+
+static sf_count_t
+dwvw_read_i (SF_PRIVATE *psf, int *ptr, sf_count_t len)
+{ DWVW_PRIVATE *pdwvw ;
+ int readcount, count ;
+ sf_count_t total = 0 ;
+
+ if (! psf->codec_data)
+ return 0 ;
+ pdwvw = (DWVW_PRIVATE*) psf->codec_data ;
+
+ while (len > 0)
+ { readcount = (len > 0x10000000) ? 0x10000000 : (int) len ;
+
+ count = dwvw_decode_data (psf, pdwvw, ptr, readcount) ;
+
+ total += count ;
+ len -= count ;
+
+ if (count != readcount)
+ break ;
+ } ;
+
+ return total ;
+} /* dwvw_read_i */
+
+static sf_count_t
+dwvw_read_f (SF_PRIVATE *psf, float *ptr, sf_count_t len)
+{ DWVW_PRIVATE *pdwvw ;
+ int *iptr ;
+ int k, bufferlen, readcount = 0, count ;
+ sf_count_t total = 0 ;
+ float normfact ;
+
+ if (! psf->codec_data)
+ return 0 ;
+ pdwvw = (DWVW_PRIVATE*) psf->codec_data ;
+
+ normfact = (psf->norm_float == SF_TRUE) ? 1.0 / ((float) 0x80000000) : 1.0 ;
+
+ iptr = psf->u.ibuf ;
+ bufferlen = ARRAY_LEN (psf->u.ibuf) ;
+ while (len > 0)
+ { readcount = (len >= bufferlen) ? bufferlen : len ;
+ count = dwvw_decode_data (psf, pdwvw, iptr, readcount) ;
+ for (k = 0 ; k < readcount ; k++)
+ ptr [total + k] = normfact * (float) (iptr [k]) ;
+
+ total += count ;
+ len -= readcount ;
+ if (count != readcount)
+ break ;
+ } ;
+
+ return total ;
+} /* dwvw_read_f */
+
+static sf_count_t
+dwvw_read_d (SF_PRIVATE *psf, double *ptr, sf_count_t len)
+{ DWVW_PRIVATE *pdwvw ;
+ int *iptr ;
+ int k, bufferlen, readcount = 0, count ;
+ sf_count_t total = 0 ;
+ double normfact ;
+
+ if (! psf->codec_data)
+ return 0 ;
+ pdwvw = (DWVW_PRIVATE*) psf->codec_data ;
+
+ normfact = (psf->norm_double == SF_TRUE) ? 1.0 / ((double) 0x80000000) : 1.0 ;
+
+ iptr = psf->u.ibuf ;
+ bufferlen = ARRAY_LEN (psf->u.ibuf) ;
+ while (len > 0)
+ { readcount = (len >= bufferlen) ? bufferlen : len ;
+ count = dwvw_decode_data (psf, pdwvw, iptr, readcount) ;
+ for (k = 0 ; k < readcount ; k++)
+ ptr [total + k] = normfact * (double) (iptr [k]) ;
+
+ total += count ;
+ len -= readcount ;
+ if (count != readcount)
+ break ;
+ } ;
+
+ return total ;
+} /* dwvw_read_d */
+
+static int
+dwvw_decode_data (SF_PRIVATE *psf, DWVW_PRIVATE *pdwvw, int *ptr, int len)
+{ int count ;
+ int delta_width_modifier, delta_width, delta_negative, delta, sample ;
+
+ /* Restore state from last decode call. */
+ delta_width = pdwvw->last_delta_width ;
+ sample = pdwvw->last_sample ;
+
+ for (count = 0 ; count < len ; count++)
+ { /* If bit_count parameter is zero get the delta_width_modifier. */
+ delta_width_modifier = dwvw_decode_load_bits (psf, pdwvw, -1) ;
+
+ /* Check for end of input bit stream. Break loop if end. */
+ if (delta_width_modifier < 0)
+ break ;
+
+ if (delta_width_modifier && dwvw_decode_load_bits (psf, pdwvw, 1))
+ delta_width_modifier = - delta_width_modifier ;
+
+ /* Calculate the current word width. */
+ delta_width = (delta_width + delta_width_modifier + pdwvw->bit_width) % pdwvw->bit_width ;
+
+ /* Load the delta. */
+ delta = 0 ;
+ if (delta_width)
+ { delta = dwvw_decode_load_bits (psf, pdwvw, delta_width - 1) | (1 << (delta_width - 1)) ;
+ delta_negative = dwvw_decode_load_bits (psf, pdwvw, 1) ;
+ if (delta == pdwvw->max_delta - 1)
+ delta += dwvw_decode_load_bits (psf, pdwvw, 1) ;
+ if (delta_negative)
+ delta = -delta ;
+ } ;
+
+ /* Calculate the sample */
+ sample += delta ;
+
+ if (sample >= pdwvw->max_delta)
+ sample -= pdwvw->span ;
+ else if (sample < - pdwvw->max_delta)
+ sample += pdwvw->span ;
+
+ /* Store the sample justifying to the most significant bit. */
+ ptr [count] = sample << (32 - pdwvw->bit_width) ;
+
+ if (pdwvw->b.end == 0 && pdwvw->bit_count == 0)
+ break ;
+ } ;
+
+ pdwvw->last_delta_width = delta_width ;
+ pdwvw->last_sample = sample ;
+
+ pdwvw->samplecount += count ;
+
+ return count ;
+} /* dwvw_decode_data */
+
+static int
+dwvw_decode_load_bits (SF_PRIVATE *psf, DWVW_PRIVATE *pdwvw, int bit_count)
+{ int output = 0, get_dwm = SF_FALSE ;
+
+ /*
+ ** Depending on the value of parameter bit_count, either get the
+ ** required number of bits (ie bit_count > 0) or the
+ ** delta_width_modifier (otherwise).
+ */
+
+ if (bit_count < 0)
+ { get_dwm = SF_TRUE ;
+ /* modify bit_count to ensure we have enought bits for finding dwm. */
+ bit_count = pdwvw->dwm_maxsize ;
+ } ;
+
+ /* Load bits in bit reseviour. */
+ while (pdwvw->bit_count < bit_count)
+ { if (pdwvw->b.index >= pdwvw->b.end)
+ { pdwvw->b.end = psf_fread (pdwvw->b.buffer, 1, sizeof (pdwvw->b.buffer), psf) ;
+ pdwvw->b.index = 0 ;
+ } ;
+
+ /* Check for end of input stream. */
+ if (bit_count < 8 && pdwvw->b.end == 0)
+ return -1 ;
+
+ pdwvw->bits = (pdwvw->bits << 8) ;
+
+ if (pdwvw->b.index < pdwvw->b.end)
+ { pdwvw->bits |= pdwvw->b.buffer [pdwvw->b.index] ;
+ pdwvw->b.index ++ ;
+ } ;
+ pdwvw->bit_count += 8 ;
+ } ;
+
+ /* If asked to get bits do so. */
+ if (! get_dwm)
+ { output = (pdwvw->bits >> (pdwvw->bit_count - bit_count)) & ((1 << bit_count) - 1) ;
+ pdwvw->bit_count -= bit_count ;
+ return output ;
+ } ;
+
+ /* Otherwise must have been asked to get delta_width_modifier. */
+ while (output < (pdwvw->dwm_maxsize))
+ { pdwvw->bit_count -= 1 ;
+ if (pdwvw->bits & (1 << pdwvw->bit_count))
+ break ;
+ output += 1 ;
+ } ;
+
+ return output ;
+} /* dwvw_decode_load_bits */
+
+static void
+dwvw_read_reset (DWVW_PRIVATE *pdwvw)
+{ pdwvw->samplecount = 0 ;
+ pdwvw->b.index = 0 ;
+ pdwvw->b.end = 0 ;
+ pdwvw->bit_count = 0 ;
+ pdwvw->bits = 0 ;
+ pdwvw->last_delta_width = 0 ;
+ pdwvw->last_sample = 0 ;
+} /* dwvw_read_reset */
+
+static void
+dwvw_encode_store_bits (SF_PRIVATE *psf, DWVW_PRIVATE *pdwvw, int data, int new_bits)
+{ int byte ;
+
+ /* Shift the bits into the resevoir. */
+ pdwvw->bits = (pdwvw->bits << new_bits) | (data & ((1 << new_bits) - 1)) ;
+ pdwvw->bit_count += new_bits ;
+
+ /* Transfer bit to buffer. */
+ while (pdwvw->bit_count >= 8)
+ { byte = pdwvw->bits >> (pdwvw->bit_count - 8) ;
+ pdwvw->bit_count -= 8 ;
+ pdwvw->b.buffer [pdwvw->b.index] = byte & 0xFF ;
+ pdwvw->b.index ++ ;
+ } ;
+
+ if (pdwvw->b.index > SIGNED_SIZEOF (pdwvw->b.buffer) - 4)
+ { psf_fwrite (pdwvw->b.buffer, 1, pdwvw->b.index, psf) ;
+ pdwvw->b.index = 0 ;
+ } ;
+
+ return ;
+} /* dwvw_encode_store_bits */
+
+#if 0
+/* Debigging routine. */
+static void
+dump_bits (DWVW_PRIVATE *pdwvw)
+{ int k, mask ;
+
+ for (k = 0 ; k < 10 && k < pdwvw->b.index ; k++)
+ { mask = 0x80 ;
+ while (mask)
+ { putchar (mask & pdwvw->b.buffer [k] ? '1' : '0') ;
+ mask >>= 1 ;
+ } ;
+ putchar (' ') ;
+ }
+
+ for (k = pdwvw->bit_count - 1 ; k >= 0 ; k --)
+ putchar (pdwvw->bits & (1 << k) ? '1' : '0') ;
+
+ putchar ('\n') ;
+} /* dump_bits */
+#endif
+
+#define HIGHEST_BIT(x,count) \
+ { int y = x ; \
+ (count) = 0 ; \
+ while (y) \
+ { (count) ++ ; \
+ y >>= 1 ; \
+ } ; \
+ } ;
+
+static int
+dwvw_encode_data (SF_PRIVATE *psf, DWVW_PRIVATE *pdwvw, const int *ptr, int len)
+{ int count ;
+ int delta_width_modifier, delta, delta_negative, delta_width, extra_bit ;
+
+ for (count = 0 ; count < len ; count++)
+ { delta = (ptr [count] >> (32 - pdwvw->bit_width)) - pdwvw->last_sample ;
+
+ /* Calculate extra_bit if needed. */
+ extra_bit = -1 ;
+ delta_negative = 0 ;
+ if (delta < -pdwvw->max_delta)
+ delta = pdwvw->max_delta + (delta % pdwvw->max_delta) ;
+ else if (delta == -pdwvw->max_delta)
+ { extra_bit = 1 ;
+ delta_negative = 1 ;
+ delta = pdwvw->max_delta - 1 ;
+ }
+ else if (delta > pdwvw->max_delta)
+ { delta_negative = 1 ;
+ delta = pdwvw->span - delta ;
+ delta = abs (delta) ;
+ }
+ else if (delta == pdwvw->max_delta)
+ { extra_bit = 1 ;
+ delta = pdwvw->max_delta - 1 ;
+ }
+ else if (delta < 0)
+ { delta_negative = 1 ;
+ delta = abs (delta) ;
+ } ;
+
+ if (delta == pdwvw->max_delta - 1 && extra_bit == -1)
+ extra_bit = 0 ;
+
+ /* Find width in bits of delta */
+ HIGHEST_BIT (delta, delta_width) ;
+
+ /* Calculate the delta_width_modifier */
+ delta_width_modifier = (delta_width - pdwvw->last_delta_width) % pdwvw->bit_width ;
+ if (delta_width_modifier > pdwvw->dwm_maxsize)
+ delta_width_modifier -= pdwvw->bit_width ;
+ if (delta_width_modifier < -pdwvw->dwm_maxsize)
+ delta_width_modifier += pdwvw->bit_width ;
+
+ /* Write delta_width_modifier zeros, followed by terminating '1'. */
+ dwvw_encode_store_bits (psf, pdwvw, 0, abs (delta_width_modifier)) ;
+ if (abs (delta_width_modifier) != pdwvw->dwm_maxsize)
+ dwvw_encode_store_bits (psf, pdwvw, 1, 1) ;
+
+ /* Write delta_width_modifier sign. */
+ if (delta_width_modifier < 0)
+ dwvw_encode_store_bits (psf, pdwvw, 1, 1) ;
+ if (delta_width_modifier > 0)
+ dwvw_encode_store_bits (psf, pdwvw, 0, 1) ;
+
+ /* Write delta and delta sign bit. */
+ if (delta_width)
+ { dwvw_encode_store_bits (psf, pdwvw, delta, abs (delta_width) - 1) ;
+ dwvw_encode_store_bits (psf, pdwvw, (delta_negative ? 1 : 0), 1) ;
+ } ;
+
+ /* Write extra bit!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! */
+ if (extra_bit >= 0)
+ dwvw_encode_store_bits (psf, pdwvw, extra_bit, 1) ;
+
+ pdwvw->last_sample = ptr [count] >> (32 - pdwvw->bit_width) ;
+ pdwvw->last_delta_width = delta_width ;
+ } ;
+
+ pdwvw->samplecount += count ;
+
+ return count ;
+} /* dwvw_encode_data */
+
+static sf_count_t
+dwvw_write_s (SF_PRIVATE *psf, const short *ptr, sf_count_t len)
+{ DWVW_PRIVATE *pdwvw ;
+ int *iptr ;
+ int k, bufferlen, writecount = 0, count ;
+ sf_count_t total = 0 ;
+
+ if (! psf->codec_data)
+ return 0 ;
+ pdwvw = (DWVW_PRIVATE*) psf->codec_data ;
+
+ iptr = psf->u.ibuf ;
+ bufferlen = ARRAY_LEN (psf->u.ibuf) ;
+ while (len > 0)
+ { writecount = (len >= bufferlen) ? bufferlen : len ;
+ for (k = 0 ; k < writecount ; k++)
+ iptr [k] = ptr [total + k] << 16 ;
+ count = dwvw_encode_data (psf, pdwvw, iptr, writecount) ;
+
+ total += count ;
+ len -= writecount ;
+ if (count != writecount)
+ break ;
+ } ;
+
+ return total ;
+} /* dwvw_write_s */
+
+static sf_count_t
+dwvw_write_i (SF_PRIVATE *psf, const int *ptr, sf_count_t len)
+{ DWVW_PRIVATE *pdwvw ;
+ int writecount, count ;
+ sf_count_t total = 0 ;
+
+ if (! psf->codec_data)
+ return 0 ;
+ pdwvw = (DWVW_PRIVATE*) psf->codec_data ;
+
+ while (len > 0)
+ { writecount = (len > 0x10000000) ? 0x10000000 : (int) len ;
+
+ count = dwvw_encode_data (psf, pdwvw, ptr, writecount) ;
+
+ total += count ;
+ len -= count ;
+
+ if (count != writecount)
+ break ;
+ } ;
+
+ return total ;
+} /* dwvw_write_i */
+
+static sf_count_t
+dwvw_write_f (SF_PRIVATE *psf, const float *ptr, sf_count_t len)
+{ DWVW_PRIVATE *pdwvw ;
+ int *iptr ;
+ int k, bufferlen, writecount = 0, count ;
+ sf_count_t total = 0 ;
+ float normfact ;
+
+ if (! psf->codec_data)
+ return 0 ;
+ pdwvw = (DWVW_PRIVATE*) psf->codec_data ;
+
+ normfact = (psf->norm_float == SF_TRUE) ? (1.0 * 0x7FFFFFFF) : 1.0 ;
+
+ iptr = psf->u.ibuf ;
+ bufferlen = ARRAY_LEN (psf->u.ibuf) ;
+ while (len > 0)
+ { writecount = (len >= bufferlen) ? bufferlen : len ;
+ for (k = 0 ; k < writecount ; k++)
+ iptr [k] = lrintf (normfact * ptr [total + k]) ;
+ count = dwvw_encode_data (psf, pdwvw, iptr, writecount) ;
+
+ total += count ;
+ len -= writecount ;
+ if (count != writecount)
+ break ;
+ } ;
+
+ return total ;
+} /* dwvw_write_f */
+
+static sf_count_t
+dwvw_write_d (SF_PRIVATE *psf, const double *ptr, sf_count_t len)
+{ DWVW_PRIVATE *pdwvw ;
+ int *iptr ;
+ int k, bufferlen, writecount = 0, count ;
+ sf_count_t total = 0 ;
+ double normfact ;
+
+ if (! psf->codec_data)
+ return 0 ;
+ pdwvw = (DWVW_PRIVATE*) psf->codec_data ;
+
+ normfact = (psf->norm_double == SF_TRUE) ? (1.0 * 0x7FFFFFFF) : 1.0 ;
+
+ iptr = psf->u.ibuf ;
+ bufferlen = ARRAY_LEN (psf->u.ibuf) ;
+ while (len > 0)
+ { writecount = (len >= bufferlen) ? bufferlen : len ;
+ for (k = 0 ; k < writecount ; k++)
+ iptr [k] = lrint (normfact * ptr [total + k]) ;
+ count = dwvw_encode_data (psf, pdwvw, iptr, writecount) ;
+
+ total += count ;
+ len -= writecount ;
+ if (count != writecount)
+ break ;
+ } ;
+
+ return total ;
+} /* dwvw_write_d */
+
projects / Faustine.git / blobdiff