dbc223eb84
Import existing source tree; original VCS history is no longer available. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
137 lines
3.3 KiB
C
137 lines
3.3 KiB
C
/*(GPL)
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---------------------------------------------------------------------------
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a_globals.h - Private global audio engine stuff
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---------------------------------------------------------------------------
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* Copyright (C) 2001, 2002, David Olofson
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2.1 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef _A_GLOBALS_H_
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#define _A_GLOBALS_H_
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#ifndef DBG
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# define DBG(x) x
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# define DBG2(x)
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# define DBG3(x)
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#endif
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#include "config.h"
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#include "audio.h"
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#include "a_pitch.h"
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#include "a_commands.h"
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#ifdef DEBUG
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#define PROFILE_AUDIO
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#endif
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#define AUDIO_USE_VU
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#undef AUDIO_LOCKING
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/*
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* Various private types, defaults and limits...
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*/
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/* Voices; virtually no per-unit overhead. */
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#define AUDIO_MAX_VOICES 32
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/* Busses; some overhead, but only for busses that are actually used. */
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#define AUDIO_MAX_BUSSES 8
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/* Bus inserts; minimal per-unit overhead. */
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#define AUDIO_MAX_INSERTS 2
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#define DEFAULT_VOL 65536
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#define DEFAULT_RVB 65536
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#define DEFAULT_LIM_RELEASE (65536 * 1 / 44100)
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#define DEFAULT_LIM_THRESHOLD 32768
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#define SDL_FRAGMENTS 2
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#define OSS_FRAGMENTS 3
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#define FREQ_BITS 20
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#define RAMP_BITS 15
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#define VOL_BITS 15
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/*
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* Restriction caused by the limited fixed point
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* range in the resampling voice mixers.
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*/
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#define MAX_FRAGMENT_SPAN (1<<(32 - FREQ_BITS))
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/*
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* Maximum size of internal mixing buffers, in frames.
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*
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* This is a cache thrashing limiter! Tune
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* to best trade-off between cache footprint
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* and looping overhead.
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*/
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#define MAX_BUFFER_SIZE 128
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/*
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* Minimum *output* buffer size, in frames.
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* This effectively sets a minimum latency limit.
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*/
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#define MIN_BUFFER_SIZE 16
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/*
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* Safety limits to prevent locking up the engine with silly input.
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*/
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#define MAX_STEP ((AUDIO_MAX_MIX_RATE / AUDIO_MIN_OUTPUT_RATE) << FREQ_BITS)
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#define MIN_LOOP ((AUDIO_MAX_MIX_RATE / AUDIO_MIN_OUTPUT_RATE) >> 1)
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/* Global engine settings */
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struct settings_t
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{
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int samplerate;
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unsigned output_buffersize;
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unsigned buffersize;
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audio_quality_t quality;
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};
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extern struct settings_t a_settings;
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/* Defaults... */
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extern accbank_t a_channel_def_ctl;
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extern accbank_t a_group_def_ctl;
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extern abcbank_t a_bus_def_ctl;
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/* For debug oscilloscope */
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#ifdef DEBUG
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# define OSCFRAMES 240
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# include "a_limiter.h"
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extern int *oscbufl;
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extern int *oscbufr;
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extern int oscframes;
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extern limiter_t limiter;
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extern int oscpos;
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void audio_print_info(void);
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#endif
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/* For audio engine profiling */
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#ifdef PROFILE_AUDIO
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# define AUDIO_CPU_FUNCTIONS 10
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extern int audio_cpu_ticks;
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extern float audio_cpu_total;
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extern float audio_cpu_function[AUDIO_CPU_FUNCTIONS];
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extern char audio_cpu_funcname[AUDIO_CPU_FUNCTIONS][20];
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#endif
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extern int _audio_running;
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#endif /*_A_GLOBALS_H_*/
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