mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-09-17 11:54:50 +02:00
74 lines
3.2 KiB
C
74 lines
3.2 KiB
C
|
/***************************************************************************************
|
||
|
|
* Genesis Plus
|
||
|
|
* PCM sound chip (315-5476A) (RF5C164 compatible)
|
||
|
|
*
|
||
|
|
* Copyright (C) 2012 Eke-Eke (Genesis Plus GX)
|
||
|
|
*
|
||
|
|
* Redistribution and use of this code or any derivative works are permitted
|
||
|
|
* provided that the following conditions are met:
|
||
|
|
*
|
||
|
|
* - Redistributions may not be sold, nor may they be used in a commercial
|
||
|
|
* product or activity.
|
||
|
|
*
|
||
|
|
* - Redistributions that are modified from the original source must include the
|
||
|
|
* complete source code, including the source code for all components used by a
|
||
|
|
* binary built from the modified sources. However, as a special exception, the
|
||
|
|
* source code distributed need not include anything that is normally distributed
|
||
|
|
* (in either source or binary form) with the major components (compiler, kernel,
|
||
|
|
* and so on) of the operating system on which the executable runs, unless that
|
||
|
|
* component itself accompanies the executable.
|
||
|
|
*
|
||
|
|
* - Redistributions must reproduce the above copyright notice, this list of
|
||
|
|
* conditions and the following disclaimer in the documentation and/or other
|
||
|
|
* materials provided with the distribution.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
||
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
||
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
*
|
||
|
|
****************************************************************************************/
|
||
|
|
#ifndef _CD_PCM_
|
||
|
|
#define _CD_PCM_
|
||
|
|
|
||
|
|
/* PCM channel */
|
||
|
|
typedef struct
|
||
|
|
{
|
||
|
|
uint32 addr; /* current Wave RAM address (16.11 fixed point) */
|
||
|
|
uint32 st; /* Wave RAM start address (16.11 fixed point) */
|
||
|
|
reg16_t ls; /* Wave RAM loop address ($0000-$ffff) */
|
||
|
|
reg16_t fd; /* Wave RAM address increment (5.11 fixed point) */
|
||
|
|
uint8 env; /* enveloppe multiplier */
|
||
|
|
uint8 pan; /* stereo panning */
|
||
|
|
} chan_t;
|
||
|
|
|
||
|
|
/* PCM sound chip */
|
||
|
|
typedef struct
|
||
|
|
{
|
||
|
|
chan_t chan[8]; /* PCM channels 1-8 */
|
||
|
|
int16 out[2]; /* previous PCM stereo output */
|
||
|
|
uint8 *bank; /* external RAM bank pointer */
|
||
|
|
uint8 enabled; /* PCM chip ON/OFF status */
|
||
|
|
uint8 status; /* channels ON/OFF status */
|
||
|
|
uint8 index; /* current channel index */
|
||
|
|
uint8 ram[0x10000]; /* 64k external RAM */
|
||
|
|
} pcm_t;
|
||
|
|
|
||
|
|
/* Function prototypes */
|
||
|
|
extern void pcm_init(double clock, double samplerate);
|
||
|
|
extern void pcm_shutdown(void);
|
||
|
|
extern void pcm_reset(void);
|
||
|
|
extern void pcm_update(short *buffer, int length);
|
||
|
|
extern void pcm_write(unsigned int address, unsigned char data);
|
||
|
|
extern unsigned char pcm_read(unsigned int address);
|
||
|
|
extern void pcm_ram_dma_w(unsigned int words);
|
||
|
|
|
||
|
|
#endif
|