106 lines
2.6 KiB
C
106 lines
2.6 KiB
C
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/*
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** Copyright (C) 1999-2009 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 "sfconfig.h"
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#include <stdio.h>
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#include <stdlib.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <string.h>
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#include <errno.h>
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#include "common.h"
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typedef struct
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{ int le_float ;
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int be_float ;
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int le_int_24_32 ;
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int be_int_24_32 ;
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} VOTE ;
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static void vote_for_format (VOTE * vote, const unsigned char * data, int datalen) ;
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int
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audio_detect (SF_PRIVATE * psf, AUDIO_DETECT *ad, const unsigned char * data, int datalen)
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{ VOTE vote ;
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if (psf == NULL)
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return 0 ;
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if (ad == NULL || datalen < 256)
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return 0 ;
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vote_for_format (&vote, data, datalen) ;
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psf_log_printf (psf, "audio_detect :\n"
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" le_float : %d\n"
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" be_float : %d\n"
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" le_int_24_32 : %d\n"
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" be_int_24_32 : %d\n",
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vote.le_float, vote.be_float, vote.le_int_24_32, vote.be_int_24_32) ;
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if (0) puts (psf->logbuffer) ;
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if (ad->endianness == SF_ENDIAN_LITTLE && vote.le_float > (3 * datalen) / 4)
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{ /* Almost certainly 32 bit floats. */
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return SF_FORMAT_FLOAT ;
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} ;
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if (ad->endianness == SF_ENDIAN_LITTLE && vote.le_int_24_32 > (3 * datalen) / 4)
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{ /* Almost certainly 24 bit data stored in 32 bit ints. */
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return SF_FORMAT_PCM_32 ;
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} ;
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return 0 ;
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} /* data_detect */
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static void
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vote_for_format (VOTE * vote, const unsigned char * data, int datalen)
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{
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int k ;
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memset (vote, 0, sizeof (VOTE)) ;
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datalen -= datalen % 4 ;
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for (k = 0 ; k < datalen ; k ++)
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{ if ((k % 4) == 0)
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{ if (data [k] == 0 && data [k + 1] != 0)
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vote->le_int_24_32 += 4 ;
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if (data [2] != 0 && data [3] == 0)
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vote->le_int_24_32 += 4 ;
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if (data [0] != 0 && data [3] > 0x43 && data [3] < 0x4B)
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vote->le_float += 4 ;
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if (data [3] != 0 && data [0] > 0x43 && data [0] < 0x4B)
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vote->be_float += 4 ;
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} ;
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} ;
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return ;
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} /* vote_for_format */
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