qemu-e2k/hw/audio/gusemu.h

105 lines
5.3 KiB
C
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/*
* GUSEMU32 - API
*
* Copyright (C) 2000-2007 Tibor "TS" Schütz
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef GUSEMU_H
#define GUSEMU_H
/* data types (need to be adjusted if neither a VC6 nor a C99 compatible compiler is used) */
#if defined _WIN32 && defined _MSC_VER /* doesn't support other win32 compilers yet, do it yourself... */
typedef unsigned char GUSbyte;
typedef unsigned short GUSword;
typedef unsigned int GUSdword;
typedef signed char GUSchar;
typedef signed short GUSsample;
#else
typedef int8_t GUSchar;
typedef uint8_t GUSbyte;
typedef uint16_t GUSword;
typedef uint32_t GUSdword;
typedef int16_t GUSsample;
#endif
typedef struct _GUSEmuState
{
GUSbyte *himemaddr; /* 1024*1024 bytes used for storing uploaded samples (+32 additional bytes for read padding) */
GUSbyte *gusdatapos; /* (gusdataend-gusdata) bytes used for storing emulated GF1/mixer register states (32*32+4 bytes in initial GUSemu32 version) */
uint32_t gusirq;
uint32_t gusdma;
unsigned int timer1fraction;
unsigned int timer2fraction;
void *opaque;
} GUSEmuState;
/* ** Callback functions needed: */
/* NMI is defined as hwirq=-1 (not supported (yet?)) */
/* GUS_irqrequest returns the number of IRQs actually scheduled into the virtual machine */
/* Level triggered IRQ simulations normally return 1 */
/* Event triggered IRQ simulation can safely ignore GUS_irqclear calls */
int GUS_irqrequest(GUSEmuState *state, int hwirq, int num);/* needed in both mixer and bus emulation functions. */
void GUS_irqclear( GUSEmuState *state, int hwirq); /* used by gus_write() only - can be left empty for mixer functions */
void GUS_dmarequest(GUSEmuState *state); /* used by gus_write() only - can be left empty for mixer functions */
/* ** ISA bus interface functions: */
/* Port I/O handlers */
/* support the following ports: */
/* 2x0,2x6,2x8...2xF,3x0...3x7; */
/* optional: 388,389 (at least writes should be forwarded or some GUS detection algorithms will fail) */
/* data is passed in host byte order */
unsigned int gus_read( GUSEmuState *state, int port, int size);
void gus_write(GUSEmuState *state, int port, int size, unsigned int data);
/* size is given in bytes (1 for byte, 2 for word) */
/* DMA data transfer function */
/* data pointed to is passed in native x86 order */
void gus_dma_transferdata(GUSEmuState *state, char *dma_addr, unsigned int count, int TC);
/* Called back by GUS_start_DMA as soon as the emulated DMA controller is ready for a transfer to or from GUS */
/* (might be immediately if the DMA controller was programmed first) */
/* dma_addr is an already translated address directly pointing to the beginning of the memory block */
/* do not forget to update DMA states after the call, including the DREQ and TC flags */
/* it is possible to break down a single transfer into multiple ones, but take care that: */
/* -dma_count is actually count-1 */
/* -before and during a transfer, DREQ is set and TC cleared */
/* -when calling gus_dma_transferdata(), TC is only set true for call transferring the last byte */
/* -after the last transfer, DREQ is cleared and TC is set */
/* ** GF1 mixer emulation functions: */
/* Usually, gus_irqgen should be called directly after gus_mixvoices if you can meet the recommended ranges. */
/* If the interrupts are executed immediately (i.e., are synchronous), it may be useful to break this */
/* down into a sequence of gus_mixvoice();gus_irqgen(); calls while mixing an audio block. */
/* If the interrupts are asynchronous, it may be needed to use a separate thread mixing into a temporary */
/* audio buffer in order to avoid quality loss caused by large numsamples and elapsed_time values. */
void gus_mixvoices(GUSEmuState *state, unsigned int playback_freq, unsigned int numsamples, GUSsample *bufferpos);
/* recommended range: 10 < numsamples < 100 */
/* lower values may result in increased rounding error, higher values often cause audible timing delays */
void gus_irqgen(GUSEmuState *state, unsigned int elapsed_time);
/* recommended range: 80us < elapsed_time < max(1000us, numsamples/playback_freq) */
/* lower values won´t provide any benefit at all, higher values can cause audible timing delays */
/* note: masked timers are also calculated by this function, thus it might be needed even without any IRQs in use! */
#endif /* GUSEMU_H */