+++ /dev/null
-/*
-** Copyright (C) 2003-2011 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.
-*/
-
-#include "sfconfig.h"
-
-#include <stdlib.h>
-
-#include "sndfile.h"
-#include "sfendian.h"
-#include "common.h"
-
-/*============================================================================
-** Rule number 1 is to only apply dither when going from a larger bitwidth
-** to a smaller bitwidth. This can happen on both read and write.
-**
-** Need to apply dither on all conversions marked X below.
-**
-** Dither on write:
-**
-** Input
-** | short int float double
-** --------+-----------------------------------------------
-** O 8 bit | X X X X
-** u 16 bit | none X X X
-** t 24 bit | none X X X
-** p 32 bit | none none X X
-** u float | none none none none
-** t double | none none none none
-**
-** Dither on read:
-**
-** Input
-** O | 8 bit 16 bit 24 bit 32 bit float double
-** u --------+-------------------------------------------------
-** t short | none none X X X X
-** p int | none none none X X X
-** u float | none none none none none none
-** t double | none none none none none none
-*/
-
-#define SFE_DITHER_BAD_PTR 666
-#define SFE_DITHER_BAD_TYPE 667
-
-typedef struct
-{ int read_short_dither_bits, read_int_dither_bits ;
- int write_short_dither_bits, write_int_dither_bits ;
- double read_float_dither_scale, read_double_dither_bits ;
- double write_float_dither_scale, write_double_dither_bits ;
-
- sf_count_t (*read_short) (SF_PRIVATE *psf, short *ptr, sf_count_t len) ;
- sf_count_t (*read_int) (SF_PRIVATE *psf, int *ptr, sf_count_t len) ;
- sf_count_t (*read_float) (SF_PRIVATE *psf, float *ptr, sf_count_t len) ;
- sf_count_t (*read_double) (SF_PRIVATE *psf, double *ptr, sf_count_t len) ;
-
- sf_count_t (*write_short) (SF_PRIVATE *psf, const short *ptr, sf_count_t len) ;
- sf_count_t (*write_int) (SF_PRIVATE *psf, const int *ptr, sf_count_t len) ;
- sf_count_t (*write_float) (SF_PRIVATE *psf, const float *ptr, sf_count_t len) ;
- sf_count_t (*write_double) (SF_PRIVATE *psf, const double *ptr, sf_count_t len) ;
-
- double buffer [SF_BUFFER_LEN / sizeof (double)] ;
-} DITHER_DATA ;
-
-static sf_count_t dither_read_short (SF_PRIVATE *psf, short *ptr, sf_count_t len) ;
-static sf_count_t dither_read_int (SF_PRIVATE *psf, int *ptr, sf_count_t len) ;
-
-static sf_count_t dither_write_short (SF_PRIVATE *psf, const short *ptr, sf_count_t len) ;
-static sf_count_t dither_write_int (SF_PRIVATE *psf, const int *ptr, sf_count_t len) ;
-static sf_count_t dither_write_float (SF_PRIVATE *psf, const float *ptr, sf_count_t len) ;
-static sf_count_t dither_write_double (SF_PRIVATE *psf, const double *ptr, sf_count_t len) ;
-
-int
-dither_init (SF_PRIVATE *psf, int mode)
-{ DITHER_DATA *pdither ;
-
- pdither = psf->dither ; /* This may be NULL. */
-
- /* Turn off dither on read. */
- if (mode == SFM_READ && psf->read_dither.type == SFD_NO_DITHER)
- { if (pdither == NULL)
- return 0 ; /* Dither is already off, so just return. */
-
- if (pdither->read_short)
- psf->read_short = pdither->read_short ;
- if (pdither->read_int)
- psf->read_int = pdither->read_int ;
- if (pdither->read_float)
- psf->read_float = pdither->read_float ;
- if (pdither->read_double)
- psf->read_double = pdither->read_double ;
- return 0 ;
- } ;
-
- /* Turn off dither on write. */
- if (mode == SFM_WRITE && psf->write_dither.type == SFD_NO_DITHER)
- { if (pdither == NULL)
- return 0 ; /* Dither is already off, so just return. */
-
- if (pdither->write_short)
- psf->write_short = pdither->write_short ;
- if (pdither->write_int)
- psf->write_int = pdither->write_int ;
- if (pdither->write_float)
- psf->write_float = pdither->write_float ;
- if (pdither->write_double)
- psf->write_double = pdither->write_double ;
- return 0 ;
- } ;
-
- /* Turn on dither on read if asked. */
- if (mode == SFM_READ && psf->read_dither.type != 0)
- { if (pdither == NULL)
- pdither = psf->dither = calloc (1, sizeof (DITHER_DATA)) ;
- if (pdither == NULL)
- return SFE_MALLOC_FAILED ;
-
- switch (SF_CODEC (psf->sf.format))
- { case SF_FORMAT_DOUBLE :
- case SF_FORMAT_FLOAT :
- pdither->read_int = psf->read_int ;
- psf->read_int = dither_read_int ;
- break ;
-
- case SF_FORMAT_PCM_32 :
- case SF_FORMAT_PCM_24 :
- case SF_FORMAT_PCM_16 :
- case SF_FORMAT_PCM_S8 :
- case SF_FORMAT_PCM_U8 :
- pdither->read_short = psf->read_short ;
- psf->read_short = dither_read_short ;
- break ;
-
- default : break ;
- } ;
- } ;
-
- /* Turn on dither on write if asked. */
- if (mode == SFM_WRITE && psf->write_dither.type != 0)
- { if (pdither == NULL)
- pdither = psf->dither = calloc (1, sizeof (DITHER_DATA)) ;
- if (pdither == NULL)
- return SFE_MALLOC_FAILED ;
-
- switch (SF_CODEC (psf->sf.format))
- { case SF_FORMAT_DOUBLE :
- case SF_FORMAT_FLOAT :
- pdither->write_int = psf->write_int ;
- psf->write_int = dither_write_int ;
- break ;
-
- case SF_FORMAT_PCM_32 :
- case SF_FORMAT_PCM_24 :
- case SF_FORMAT_PCM_16 :
- case SF_FORMAT_PCM_S8 :
- case SF_FORMAT_PCM_U8 :
- break ;
-
- default : break ;
- } ;
-
- pdither->write_short = psf->write_short ;
- psf->write_short = dither_write_short ;
-
- pdither->write_int = psf->write_int ;
- psf->write_int = dither_write_int ;
-
- pdither->write_float = psf->write_float ;
- psf->write_float = dither_write_float ;
-
- pdither->write_double = psf->write_double ;
- psf->write_double = dither_write_double ;
- } ;
-
- return 0 ;
-} /* dither_init */
-
-/*==============================================================================
-*/
-
-static void dither_short (const short *in, short *out, int frames, int channels) ;
-static void dither_int (const int *in, int *out, int frames, int channels) ;
-
-static void dither_float (const float *in, float *out, int frames, int channels) ;
-static void dither_double (const double *in, double *out, int frames, int channels) ;
-
-static sf_count_t
-dither_read_short (SF_PRIVATE * UNUSED (psf), short * UNUSED (ptr), sf_count_t len)
-{
- return len ;
-} /* dither_read_short */
-
-static sf_count_t
-dither_read_int (SF_PRIVATE * UNUSED (psf), int * UNUSED (ptr), sf_count_t len)
-{
- return len ;
-} /* dither_read_int */
-
-/*------------------------------------------------------------------------------
-*/
-
-static sf_count_t
-dither_write_short (SF_PRIVATE *psf, const short *ptr, sf_count_t len)
-{ DITHER_DATA *pdither ;
- int bufferlen, writecount, thiswrite ;
- sf_count_t total = 0 ;
-
- if ((pdither = psf->dither) == NULL)
- { psf->error = SFE_DITHER_BAD_PTR ;
- return 0 ;
- } ;
-
- switch (SF_CODEC (psf->sf.format))
- { case SF_FORMAT_PCM_S8 :
- case SF_FORMAT_PCM_U8 :
- case SF_FORMAT_DPCM_8 :
- break ;
-
- default :
- return pdither->write_short (psf, ptr, len) ;
- } ;
-
- bufferlen = sizeof (pdither->buffer) / sizeof (short) ;
-
- while (len > 0)
- { writecount = (len >= bufferlen) ? bufferlen : (int) len ;
- writecount /= psf->sf.channels ;
- writecount *= psf->sf.channels ;
-
- dither_short (ptr, (short*) pdither->buffer, writecount / psf->sf.channels, psf->sf.channels) ;
-
- thiswrite = pdither->write_short (psf, (short*) pdither->buffer, writecount) ;
- total += thiswrite ;
- len -= thiswrite ;
- if (thiswrite < writecount)
- break ;
- } ;
-
- return total ;
-} /* dither_write_short */
-
-static sf_count_t
-dither_write_int (SF_PRIVATE *psf, const int *ptr, sf_count_t len)
-{ DITHER_DATA *pdither ;
- int bufferlen, writecount, thiswrite ;
- sf_count_t total = 0 ;
-
- if ((pdither = psf->dither) == NULL)
- { psf->error = SFE_DITHER_BAD_PTR ;
- return 0 ;
- } ;
-
- switch (SF_CODEC (psf->sf.format))
- { case SF_FORMAT_PCM_S8 :
- case SF_FORMAT_PCM_U8 :
- case SF_FORMAT_PCM_16 :
- case SF_FORMAT_PCM_24 :
- break ;
-
- case SF_FORMAT_DPCM_8 :
- case SF_FORMAT_DPCM_16 :
- break ;
-
- default :
- return pdither->write_int (psf, ptr, len) ;
- } ;
-
-
- bufferlen = sizeof (pdither->buffer) / sizeof (int) ;
-
- while (len > 0)
- { writecount = (len >= bufferlen) ? bufferlen : (int) len ;
- writecount /= psf->sf.channels ;
- writecount *= psf->sf.channels ;
-
- dither_int (ptr, (int*) pdither->buffer, writecount / psf->sf.channels, psf->sf.channels) ;
-
- thiswrite = pdither->write_int (psf, (int*) pdither->buffer, writecount) ;
- total += thiswrite ;
- len -= thiswrite ;
- if (thiswrite < writecount)
- break ;
- } ;
-
- return total ;
-} /* dither_write_int */
-
-static sf_count_t
-dither_write_float (SF_PRIVATE *psf, const float *ptr, sf_count_t len)
-{ DITHER_DATA *pdither ;
- int bufferlen, writecount, thiswrite ;
- sf_count_t total = 0 ;
-
- if ((pdither = psf->dither) == NULL)
- { psf->error = SFE_DITHER_BAD_PTR ;
- return 0 ;
- } ;
-
- switch (SF_CODEC (psf->sf.format))
- { case SF_FORMAT_PCM_S8 :
- case SF_FORMAT_PCM_U8 :
- case SF_FORMAT_PCM_16 :
- case SF_FORMAT_PCM_24 :
- break ;
-
- case SF_FORMAT_DPCM_8 :
- case SF_FORMAT_DPCM_16 :
- break ;
-
- default :
- return pdither->write_float (psf, ptr, len) ;
- } ;
-
- bufferlen = sizeof (pdither->buffer) / sizeof (float) ;
-
- while (len > 0)
- { writecount = (len >= bufferlen) ? bufferlen : (float) len ;
- writecount /= psf->sf.channels ;
- writecount *= psf->sf.channels ;
-
- dither_float (ptr, (float*) pdither->buffer, writecount / psf->sf.channels, psf->sf.channels) ;
-
- thiswrite = pdither->write_float (psf, (float*) pdither->buffer, writecount) ;
- total += thiswrite ;
- len -= thiswrite ;
- if (thiswrite < writecount)
- break ;
- } ;
-
- return total ;
-} /* dither_write_float */
-
-static sf_count_t
-dither_write_double (SF_PRIVATE *psf, const double *ptr, sf_count_t len)
-{ DITHER_DATA *pdither ;
- int bufferlen, writecount, thiswrite ;
- sf_count_t total = 0 ;
-
- if ((pdither = psf->dither) == NULL)
- { psf->error = SFE_DITHER_BAD_PTR ;
- return 0 ;
- } ;
-
- switch (SF_CODEC (psf->sf.format))
- { case SF_FORMAT_PCM_S8 :
- case SF_FORMAT_PCM_U8 :
- case SF_FORMAT_PCM_16 :
- case SF_FORMAT_PCM_24 :
- break ;
-
- case SF_FORMAT_DPCM_8 :
- case SF_FORMAT_DPCM_16 :
- break ;
-
- default :
- return pdither->write_double (psf, ptr, len) ;
- } ;
-
-
- bufferlen = sizeof (pdither->buffer) / sizeof (double) ;
-
- while (len > 0)
- { writecount = (len >= bufferlen) ? bufferlen : (double) len ;
- writecount /= psf->sf.channels ;
- writecount *= psf->sf.channels ;
-
- dither_double (ptr, (double*) pdither->buffer, writecount / psf->sf.channels, psf->sf.channels) ;
-
- thiswrite = pdither->write_double (psf, (double*) pdither->buffer, writecount) ;
- total += thiswrite ;
- len -= thiswrite ;
- if (thiswrite < writecount)
- break ;
- } ;
-
- return total ;
-} /* dither_write_double */
-
-/*==============================================================================
-*/
-
-static void
-dither_short (const short *in, short *out, int frames, int channels)
-{ int ch, k ;
-
- for (ch = 0 ; ch < channels ; ch++)
- for (k = ch ; k < channels * frames ; k += channels)
- out [k] = in [k] ;
-
-} /* dither_short */
-
-static void
-dither_int (const int *in, int *out, int frames, int channels)
-{ int ch, k ;
-
- for (ch = 0 ; ch < channels ; ch++)
- for (k = ch ; k < channels * frames ; k += channels)
- out [k] = in [k] ;
-
-} /* dither_int */
-
-static void
-dither_float (const float *in, float *out, int frames, int channels)
-{ int ch, k ;
-
- for (ch = 0 ; ch < channels ; ch++)
- for (k = ch ; k < channels * frames ; k += channels)
- out [k] = in [k] ;
-
-} /* dither_float */
-
-static void
-dither_double (const double *in, double *out, int frames, int channels)
-{ int ch, k ;
-
- for (ch = 0 ; ch < channels ; ch++)
- for (k = ch ; k < channels * frames ; k += channels)
- out [k] = in [k] ;
-
-} /* dither_double */
-
-/*==============================================================================
-*/
-#if 0
-
-/*
-** Not made public because this (maybe) requires storage of state information.
-**
-** Also maybe need separate state info for each channel!!!!
-*/
-
-int
-DO_NOT_USE_sf_dither_short (const SF_DITHER_INFO *dither, const short *in, short *out, int frames, int channels)
-{ int ch, k ;
-
- if (! dither)
- return SFE_DITHER_BAD_PTR ;
-
- switch (dither->type & SFD_TYPEMASK)
- { case SFD_WHITE :
- case SFD_TRIANGULAR_PDF :
- for (ch = 0 ; ch < channels ; ch++)
- for (k = ch ; k < channels * frames ; k += channels)
- out [k] = in [k] ;
- break ;
-
- default :
- return SFE_DITHER_BAD_TYPE ;
- } ;
-
- return 0 ;
-} /* DO_NOT_USE_sf_dither_short */
-
-int
-DO_NOT_USE_sf_dither_int (const SF_DITHER_INFO *dither, const int *in, int *out, int frames, int channels)
-{ int ch, k ;
-
- if (! dither)
- return SFE_DITHER_BAD_PTR ;
-
- switch (dither->type & SFD_TYPEMASK)
- { case SFD_WHITE :
- case SFD_TRIANGULAR_PDF :
- for (ch = 0 ; ch < channels ; ch++)
- for (k = ch ; k < channels * frames ; k += channels)
- out [k] = in [k] ;
- break ;
-
- default :
- return SFE_DITHER_BAD_TYPE ;
- } ;
-
- return 0 ;
-} /* DO_NOT_USE_sf_dither_int */
-
-int
-DO_NOT_USE_sf_dither_float (const SF_DITHER_INFO *dither, const float *in, float *out, int frames, int channels)
-{ int ch, k ;
-
- if (! dither)
- return SFE_DITHER_BAD_PTR ;
-
- switch (dither->type & SFD_TYPEMASK)
- { case SFD_WHITE :
- case SFD_TRIANGULAR_PDF :
- for (ch = 0 ; ch < channels ; ch++)
- for (k = ch ; k < channels * frames ; k += channels)
- out [k] = in [k] ;
- break ;
-
- default :
- return SFE_DITHER_BAD_TYPE ;
- } ;
-
- return 0 ;
-} /* DO_NOT_USE_sf_dither_float */
-
-int
-DO_NOT_USE_sf_dither_double (const SF_DITHER_INFO *dither, const double *in, double *out, int frames, int channels)
-{ int ch, k ;
-
- if (! dither)
- return SFE_DITHER_BAD_PTR ;
-
- switch (dither->type & SFD_TYPEMASK)
- { case SFD_WHITE :
- case SFD_TRIANGULAR_PDF :
- for (ch = 0 ; ch < channels ; ch++)
- for (k = ch ; k < channels * frames ; k += channels)
- out [k] = in [k] ;
- break ;
-
- default :
- return SFE_DITHER_BAD_TYPE ;
- } ;
-
- return 0 ;
-} /* DO_NOT_USE_sf_dither_double */
-
-#endif
-
projects / Faustine.git / blobdiff