Blame libao/float2s16.c

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/*
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 * float2s16.c
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 * Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
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 * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
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 *
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 * This file is part of a52dec, a free ATSC A-52 stream decoder.
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 * See http://liba52.sourceforge.net/ for updates.
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 *
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 * a52dec is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * a52dec 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 General Public License for more details.
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 *
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 * You should have received a copy of the GNU 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 "config.h"
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#include <inttypes.h>
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#include "a52.h"
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#include "audio_out.h"
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static inline int16_t convert (int32_t i)
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{
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    if (i > 0x43c07fff)
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	return 32767;
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    else if (i < 0x43bf8000)
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	return -32768;
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    else
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	return i - 0x43c00000;
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}
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void float2s16_2 (float * _f, int16_t * s16)
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{
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    int i;
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    int32_t * f = (int32_t *) _f;
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    for (i = 0; i < 256; i++) {
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	s16[2*i] = convert (f[i]);
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	s16[2*i+1] = convert (f[i+256]);
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    }
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}
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void float2s16_4 (float * _f, int16_t * s16)
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{
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    int i;
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    int32_t * f = (int32_t *) _f;
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    for (i = 0; i < 256; i++) {
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	s16[4*i] = convert (f[i]);
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	s16[4*i+1] = convert (f[i+256]);
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	s16[4*i+2] = convert (f[i+512]);
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	s16[4*i+3] = convert (f[i+768]);
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    }
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}
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void float2s16_5 (float * _f, int16_t * s16)
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{
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    int i;
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    int32_t * f = (int32_t *) _f;
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    for (i = 0; i < 256; i++) {
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	s16[5*i] = convert (f[i]);
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	s16[5*i+1] = convert (f[i+256]);
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	s16[5*i+2] = convert (f[i+512]);
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	s16[5*i+3] = convert (f[i+768]);
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	s16[5*i+4] = convert (f[i+1024]);
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    }
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}
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int channels_multi (int flags)
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{
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    if (flags & A52_LFE)
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	return 6;
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    else if (flags & 1)	/* center channel */
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	return 5;
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    else if ((flags & A52_CHANNEL_MASK) == A52_2F2R)
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	return 4;
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    else
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	return 2;
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}
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void float2s16_multi (float * _f, int16_t * s16, int flags)
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{
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    int i;
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    int32_t * f = (int32_t *) _f;
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    switch (flags) {
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    case A52_MONO:
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	for (i = 0; i < 256; i++) {
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	    s16[5*i] = s16[5*i+1] = s16[5*i+2] = s16[5*i+3] = 0;
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	    s16[5*i+4] = convert (f[i]);
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	}
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	break;
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    case A52_CHANNEL:
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    case A52_STEREO:
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    case A52_DOLBY:
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	float2s16_2 (_f, s16);
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	break;
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    case A52_3F:
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	for (i = 0; i < 256; i++) {
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	    s16[5*i] = convert (f[i]);
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	    s16[5*i+1] = convert (f[i+512]);
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	    s16[5*i+2] = s16[5*i+3] = 0;
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	    s16[5*i+4] = convert (f[i+256]);
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	}
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	break;
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    case A52_2F2R:
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	float2s16_4 (_f, s16);
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	break;
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    case A52_3F2R:
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	float2s16_5 (_f, s16);
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	break;
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    case A52_MONO | A52_LFE:
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	for (i = 0; i < 256; i++) {
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	    s16[6*i] = s16[6*i+1] = s16[6*i+2] = s16[6*i+3] = 0;
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	    s16[6*i+4] = convert (f[i+256]);
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	    s16[6*i+5] = convert (f[i]);
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	}
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	break;
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    case A52_CHANNEL | A52_LFE:
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    case A52_STEREO | A52_LFE:
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    case A52_DOLBY | A52_LFE:
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	for (i = 0; i < 256; i++) {
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	    s16[6*i] = convert (f[i+256]);
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	    s16[6*i+1] = convert (f[i+512]);
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	    s16[6*i+2] = s16[6*i+3] = s16[6*i+4] = 0;
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	    s16[6*i+5] = convert (f[i]);
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	}
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	break;
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    case A52_3F | A52_LFE:
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	for (i = 0; i < 256; i++) {
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	    s16[6*i] = convert (f[i+256]);
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	    s16[6*i+1] = convert (f[i+768]);
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	    s16[6*i+2] = s16[6*i+3] = 0;
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	    s16[6*i+4] = convert (f[i+512]);
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	    s16[6*i+5] = convert (f[i]);
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	}
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	break;
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    case A52_2F2R | A52_LFE:
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	for (i = 0; i < 256; i++) {
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	    s16[6*i] = convert (f[i+256]);
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	    s16[6*i+1] = convert (f[i+512]);
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	    s16[6*i+2] = convert (f[i+768]);
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	    s16[6*i+3] = convert (f[i+1024]);
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	    s16[6*i+4] = 0;
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	    s16[6*i+5] = convert (f[i]);
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	}
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	break;
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    case A52_3F2R | A52_LFE:
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	for (i = 0; i < 256; i++) {
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	    s16[6*i] = convert (f[i+256]);
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	    s16[6*i+1] = convert (f[i+768]);
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	    s16[6*i+2] = convert (f[i+1024]);
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	    s16[6*i+3] = convert (f[i+1280]);
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	    s16[6*i+4] = convert (f[i+512]);
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	    s16[6*i+5] = convert (f[i]);
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	}
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	break;
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    }
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}
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void s16_swap (int16_t * s16, int channels)
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{
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    int i;
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    uint16_t * u16 = (uint16_t *) s16;
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    for (i = 0; i < 256 * channels; i++)
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	u16[i] = (u16[i] >> 8) | (u16[i] << 8);
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}