92 lines
No EOL
2.3 KiB
C++
92 lines
No EOL
2.3 KiB
C++
/*
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TiMidity++ -- MIDI to WAVE converter and player
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Copyright (C) 1999-2002 Masanao Izumo <mo@goice.co.jp>
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Copyright (C) 1995 Tuukka Toivonen <tt@cgs.fi>
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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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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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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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output.c
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Audio output (to file / device) functions.
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*/
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#include "timidity.h"
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#include "common.h"
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#include "sysdep.h"
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#include "tables.h"
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namespace TimidityPlus
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{
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int audio_buffer_bits = DEFAULT_AUDIO_BUFFER_BITS;
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extern PlayMode w32_play_mode;
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#define DEV_PLAY_MODE &w32_play_mode
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extern PlayMode raw_play_mode;
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PlayMode *play_mode = DEV_PLAY_MODE;
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/*****************************************************************/
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/* Some functions to convert signed 32-bit data to other formats */
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void s32tos16(int32_t *lp, int32_t c)
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{
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int16_t *sp=(int16_t *)(lp);
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int32_t l, i;
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for(i = 0; i < c; i++)
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{
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l=(lp[i])>>(32-16-GUARD_BITS);
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if (l > 32767) l=32767;
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else if (l<-32768) l=-32768;
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sp[i] = (int16_t)(l);
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}
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}
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// This only gets used as intermediate so we do not care about byte order
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#define STORE_S24(cp, l) *cp++ = l & 0xFF, *cp++ = l >> 8 & 0xFF, *cp++ = l >> 16
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#define MAX_24BIT_SIGNED (8388607)
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#define MIN_24BIT_SIGNED (-8388608)
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void s32tos24(int32_t *lp, int32_t c)
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{
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uint8_t *cp = (uint8_t *)(lp);
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int32_t l, i;
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for(i = 0; i < c; i++)
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{
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l = (lp[i]) >> (32 - 24 - GUARD_BITS);
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l = (l > MAX_24BIT_SIGNED) ? MAX_24BIT_SIGNED
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: (l < MIN_24BIT_SIGNED) ? MIN_24BIT_SIGNED : l;
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STORE_S24(cp, l);
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}
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}
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/* return: number of bytes */
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int32_t general_output_convert(int32_t *buf, int32_t count)
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{
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int32_t bytes;
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count *= 2; /* Stereo samples */
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bytes = count;
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bytes *= 2;
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s32tos16(buf, count);
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return bytes;
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}
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} |