110 lines
2.7 KiB
C
110 lines
2.7 KiB
C
// ------------------------------------------------------------------------
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// eca-sample-conversion.h: Routines for convering between sample formats.
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// Copyright (C) 2002,2003 Kai Vehmanen
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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 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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// 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 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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#ifndef INCLUDED_ECA_SAMPLE_CONVERSION_H
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#define INCLUDED_ECA_SAMPLE_CONVERSION_H
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#include <kvu_inttypes.h>
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/**
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* Type definitions
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*/
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#ifndef INT8_MAX
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#define INT8_MAX (127)
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#endif
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#ifndef UINT8_MIN
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#define UINT8_MIN (0)
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#endif
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#ifndef UINT8_MAX
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#define UINT8_MAX (255)
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#endif
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#ifndef INT16_MAX
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#define INT16_MAX (32767)
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#endif
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#ifndef INT16_MIN
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#define INT16_MIN (-32767-1)
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#endif
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#ifndef INT32_MAX
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#define INT32_MAX (2147483647)
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#endif
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#ifndef INT32_MIN
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#define INT32_MIN (-2147483647-1)
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#endif
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/**
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* Function definitions
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*/
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static inline uint8_t eca_sample_convert_float_to_u8(float inval)
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{
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if (inval < 0.0f)
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return((uint8_t)((float)(inval * (INT8_MAX + 1)) + (INT8_MAX + 1)));
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return((uint8_t)((float)(inval * INT8_MAX) + (INT8_MAX + 1)));
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}
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static inline int16_t eca_sample_convert_float_to_s16(float inval)
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{
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if (inval < 0.0f)
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return((int16_t)(float)((inval * (INT16_MAX + 1))));
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return((int16_t)((float)(inval * INT16_MAX)));
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}
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static inline int32_t eca_sample_convert_float_to_s32(float inval)
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{
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if (inval < 0.0f)
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return((int32_t)((float)(inval * (INT32_MAX))));
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return((int32_t)((float)(inval * INT32_MAX) - 0.5f));
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}
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static inline float eca_sample_convert_u8_to_float(uint8_t inval)
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{
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/* NOTE: this is sub-optimal, but at least gcc-2.91.66 otherwise
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* compiles the test incorrectly) */
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int16_t inval_b = inval;
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if (inval_b <= INT8_MAX)
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return(((((float)inval) - INT8_MAX) / INT8_MAX));
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return(((((float)inval) - (INT8_MAX + 1)) / INT8_MAX));
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}
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static inline float eca_sample_convert_s16_to_float(int16_t inval)
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{
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if (inval < 0)
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return(((float)inval) / (INT16_MAX + 1));
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return(((float)inval) / INT16_MAX);
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}
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static inline float eca_sample_convert_s32_to_float(int32_t inval)
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{
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return(((float)inval) / INT32_MAX);
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}
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#endif
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