300 lines
7.5 KiB
C
300 lines
7.5 KiB
C
/*
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** Copyright (C) 2002-2013 Erik de Castro Lopo <erikd@mega-nerd.com>
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU Lesser General Public License as published by
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** the Free Software Foundation; either version 2.1 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU Lesser General Public License for more details.
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**
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** You should have received a copy of the GNU Lesser General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "sfendian.h"
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#include <stdlib.h>
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#include "sndfile.h"
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#include "common.h"
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#define INTERLEAVE_CHANNELS 6
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typedef struct
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{ double buffer [SF_BUFFER_LEN / sizeof (double)] ;
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sf_count_t channel_len ;
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sf_count_t (*read_short) (SF_PRIVATE*, short *ptr, sf_count_t len) ;
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sf_count_t (*read_int) (SF_PRIVATE*, int *ptr, sf_count_t len) ;
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sf_count_t (*read_float) (SF_PRIVATE*, float *ptr, sf_count_t len) ;
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sf_count_t (*read_double) (SF_PRIVATE*, double *ptr, sf_count_t len) ;
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} INTERLEAVE_DATA ;
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static sf_count_t interleave_read_short (SF_PRIVATE *psf, short *ptr, sf_count_t len) ;
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static sf_count_t interleave_read_int (SF_PRIVATE *psf, int *ptr, sf_count_t len) ;
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static sf_count_t interleave_read_float (SF_PRIVATE *psf, float *ptr, sf_count_t len) ;
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static sf_count_t interleave_read_double (SF_PRIVATE *psf, double *ptr, sf_count_t len) ;
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static sf_count_t interleave_seek (SF_PRIVATE*, int mode, sf_count_t samples_from_start) ;
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int
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interleave_init (SF_PRIVATE *psf)
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{ INTERLEAVE_DATA *pdata ;
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if (psf->file.mode != SFM_READ)
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return SFE_INTERLEAVE_MODE ;
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if (psf->interleave)
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{ psf_log_printf (psf, "*** Weird, already have interleave.\n") ;
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return 666 ;
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} ;
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/* Free this in sf_close() function. */
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if (! (pdata = malloc (sizeof (INTERLEAVE_DATA))))
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return SFE_MALLOC_FAILED ;
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puts ("interleave_init") ;
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psf->interleave = pdata ;
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/* Save the existing methods. */
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pdata->read_short = psf->read_short ;
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pdata->read_int = psf->read_int ;
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pdata->read_float = psf->read_float ;
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pdata->read_double = psf->read_double ;
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pdata->channel_len = psf->sf.frames * psf->bytewidth ;
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/* Insert our new methods. */
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psf->read_short = interleave_read_short ;
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psf->read_int = interleave_read_int ;
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psf->read_float = interleave_read_float ;
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psf->read_double = interleave_read_double ;
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psf->seek = interleave_seek ;
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return 0 ;
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} /* pcm_interleave_init */
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/*------------------------------------------------------------------------------
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*/
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static sf_count_t
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interleave_read_short (SF_PRIVATE *psf, short *ptr, sf_count_t len)
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{ INTERLEAVE_DATA *pdata ;
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sf_count_t offset, templen ;
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int chan, count, k ;
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short *inptr, *outptr ;
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if (! (pdata = psf->interleave))
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return 0 ;
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inptr = (short*) pdata->buffer ;
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for (chan = 0 ; chan < psf->sf.channels ; chan++)
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{ outptr = ptr + chan ;
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offset = psf->dataoffset + chan * psf->bytewidth * psf->read_current ;
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if (psf_fseek (psf, offset, SEEK_SET) != offset)
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{ psf->error = SFE_INTERLEAVE_SEEK ;
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return 0 ;
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} ;
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templen = len / psf->sf.channels ;
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while (templen > 0)
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{ if (templen > SIGNED_SIZEOF (pdata->buffer) / SIGNED_SIZEOF (short))
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count = SIGNED_SIZEOF (pdata->buffer) / SIGNED_SIZEOF (short) ;
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else
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count = (int) templen ;
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if (pdata->read_short (psf, inptr, count) != count)
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{ psf->error = SFE_INTERLEAVE_READ ;
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return 0 ;
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} ;
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for (k = 0 ; k < count ; k++)
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{ *outptr = inptr [k] ;
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outptr += psf->sf.channels ;
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} ;
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templen -= count ;
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} ;
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} ;
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return len ;
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} /* interleave_read_short */
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static sf_count_t
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interleave_read_int (SF_PRIVATE *psf, int *ptr, sf_count_t len)
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{ INTERLEAVE_DATA *pdata ;
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sf_count_t offset, templen ;
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int chan, count, k ;
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int *inptr, *outptr ;
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if (! (pdata = psf->interleave))
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return 0 ;
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inptr = (int*) pdata->buffer ;
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for (chan = 0 ; chan < psf->sf.channels ; chan++)
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{ outptr = ptr + chan ;
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offset = psf->dataoffset + chan * psf->bytewidth * psf->read_current ;
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if (psf_fseek (psf, offset, SEEK_SET) != offset)
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{ psf->error = SFE_INTERLEAVE_SEEK ;
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return 0 ;
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} ;
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templen = len / psf->sf.channels ;
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while (templen > 0)
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{ if (templen > SIGNED_SIZEOF (pdata->buffer) / SIGNED_SIZEOF (int))
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count = SIGNED_SIZEOF (pdata->buffer) / SIGNED_SIZEOF (int) ;
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else
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count = (int) templen ;
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if (pdata->read_int (psf, inptr, count) != count)
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{ psf->error = SFE_INTERLEAVE_READ ;
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return 0 ;
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} ;
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for (k = 0 ; k < count ; k++)
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{ *outptr = inptr [k] ;
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outptr += psf->sf.channels ;
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} ;
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templen -= count ;
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} ;
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} ;
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return len ;
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} /* interleave_read_int */
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static sf_count_t
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interleave_read_float (SF_PRIVATE *psf, float *ptr, sf_count_t len)
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{ INTERLEAVE_DATA *pdata ;
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sf_count_t offset, templen ;
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int chan, count, k ;
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float *inptr, *outptr ;
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if (! (pdata = psf->interleave))
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return 0 ;
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inptr = (float*) pdata->buffer ;
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for (chan = 0 ; chan < psf->sf.channels ; chan++)
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{ outptr = ptr + chan ;
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offset = psf->dataoffset + pdata->channel_len * chan + psf->read_current * psf->bytewidth ;
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/*-printf ("chan : %d read_current : %6lld offset : %6lld\n", chan, psf->read_current, offset) ;-*/
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if (psf_fseek (psf, offset, SEEK_SET) != offset)
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{ psf->error = SFE_INTERLEAVE_SEEK ;
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/*-puts ("interleave_seek error") ; exit (1) ;-*/
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return 0 ;
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} ;
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templen = len / psf->sf.channels ;
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while (templen > 0)
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{ if (templen > SIGNED_SIZEOF (pdata->buffer) / SIGNED_SIZEOF (float))
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count = SIGNED_SIZEOF (pdata->buffer) / SIGNED_SIZEOF (float) ;
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else
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count = (int) templen ;
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if (pdata->read_float (psf, inptr, count) != count)
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{ psf->error = SFE_INTERLEAVE_READ ;
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/*-puts ("interleave_read error") ; exit (1) ;-*/
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return 0 ;
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} ;
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for (k = 0 ; k < count ; k++)
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{ *outptr = inptr [k] ;
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outptr += psf->sf.channels ;
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} ;
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templen -= count ;
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} ;
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} ;
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return len ;
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} /* interleave_read_float */
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static sf_count_t
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interleave_read_double (SF_PRIVATE *psf, double *ptr, sf_count_t len)
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{ INTERLEAVE_DATA *pdata ;
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sf_count_t offset, templen ;
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int chan, count, k ;
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double *inptr, *outptr ;
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if (! (pdata = psf->interleave))
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return 0 ;
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inptr = (double*) pdata->buffer ;
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for (chan = 0 ; chan < psf->sf.channels ; chan++)
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{ outptr = ptr + chan ;
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offset = psf->dataoffset + chan * psf->bytewidth * psf->read_current ;
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if (psf_fseek (psf, offset, SEEK_SET) != offset)
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{ psf->error = SFE_INTERLEAVE_SEEK ;
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return 0 ;
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} ;
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templen = len / psf->sf.channels ;
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while (templen > 0)
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{ if (templen > SIGNED_SIZEOF (pdata->buffer) / SIGNED_SIZEOF (double))
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count = SIGNED_SIZEOF (pdata->buffer) / SIGNED_SIZEOF (double) ;
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else
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count = (int) templen ;
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if (pdata->read_double (psf, inptr, count) != count)
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{ psf->error = SFE_INTERLEAVE_READ ;
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return 0 ;
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} ;
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for (k = 0 ; k < count ; k++)
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{ *outptr = inptr [k] ;
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outptr += psf->sf.channels ;
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} ;
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templen -= count ;
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} ;
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} ;
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return len ;
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} /* interleave_read_double */
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/*------------------------------------------------------------------------------
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*/
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static sf_count_t
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interleave_seek (SF_PRIVATE * UNUSED (psf), int UNUSED (mode), sf_count_t samples_from_start)
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{
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/*
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** Do nothing here. This is a place holder to prevent the default
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** seek function from being called.
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*/
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return samples_from_start ;
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} /* interleave_seek */
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