dingusppc/devices/sound/awacs.cpp
2022-07-18 20:27:34 +02:00

208 lines
5.9 KiB
C++

/*
DingusPPC - The Experimental PowerPC Macintosh emulator
Copyright (C) 2018-21 divingkatae and maximum
(theweirdo) spatium
(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
/** AWAC sound device emulation.
Currently supported audio codecs:
- PDM AWACs in Nubus Power Macintosh models
- Screamer AWACs in Beige G3
Author: Max Poliakovski 2019-21
*/
#include <devices/common/dbdma.h>
#include <devices/sound/awacs.h>
#include <devices/sound/soundserver.h>
#include <endianswap.h>
#include <machines/machinebase.h>
#include <algorithm>
#include <loguru.hpp>
#include <memory>
AwacsBase::AwacsBase()
{
// connect to SoundServer
this->snd_server = dynamic_cast<SoundServer *>
(gMachineObj->get_comp_by_name("SoundServer"));
this->out_stream_ready = false;
}
void AwacsBase::set_sample_rate(int sr_id)
{
if (sr_id > this->max_sr_id) {
LOG_F(ERROR, "AWACs: invalid sample rate ID %d!", sr_id);
} else {
this->cur_sample_rate = this->sr_table[sr_id];
}
};
void AwacsBase::start_output_dma()
{
int err;
if ((err = this->snd_server->open_out_stream(this->cur_sample_rate,
(void *)this->dma_out_ch))) {
LOG_F(ERROR, "AWACs: unable to open sound output stream: %d", err);
this->out_stream_ready = false;
return;
}
this->out_stream_ready = true;
if ((err = snd_server->start_out_stream())) {
LOG_F(ERROR, "AWACs: could not start sound output stream");
}
}
void AwacsBase::stop_output_dma()
{
if (this->out_stream_ready) {
snd_server->close_out_stream();
this->out_stream_ready = false;
}
}
//=========================== PDM-style AWACs =================================
AwacDevicePdm::AwacDevicePdm() : AwacsBase()
{
static int pdm_awac_freqs[3] = {22050, 29400, 44100};
// PDM-style AWACs only supports three sample rates
this->sr_table = pdm_awac_freqs;
this->max_sr_id = 2;
}
uint32_t AwacDevicePdm::read_stat()
{
LOG_F(INFO, "AWACs-PDM: status requested!");
// TODO: return valid status including manufacturer & device IDs
return 0;
}
void AwacDevicePdm::write_ctrl(uint32_t addr, uint16_t value)
{
LOG_F(9, "AWACs-PDM: control updated, addr=0x%X, val=0x%X", addr, value);
if (addr <= 4) {
this->ctrl_regs[addr] = value;
} else {
LOG_F(ERROR, "AWACs-PDM: invalid control register address %d!", addr);
}
}
//============================= Screamer AWACs ================================
AwacsScreamer::AwacsScreamer() : AwacsBase()
{
this->audio_proc = std::unique_ptr<AudioProcessor> (new AudioProcessor());
/* register audio processor chip with the I2C bus */
I2CBus* i2c_bus = dynamic_cast<I2CBus*>(gMachineObj->get_comp_by_type(HWCompType::I2C_HOST));
i2c_bus->register_device(0x45, this->audio_proc.get());
static int screamer_freqs[8] = {
44100, 29400, 22050, 17640, 14700, 11025, 8820, 7350
};
this->sr_table = screamer_freqs;
this->max_sr_id = 7;
}
uint32_t AwacsScreamer::snd_ctrl_read(uint32_t offset, int size)
{
switch (offset) {
case AWAC_SOUND_CTRL_REG:
return this->snd_ctrl_reg;
case AWAC_CODEC_CTRL_REG:
return this->is_busy;
case AWAC_CODEC_STATUS_REG:
return (AWAC_AVAILABLE << 8) | (AWAC_MAKER_CRYSTAL << 16) | (AWAC_REV_SCREAMER << 20);
default:
LOG_F(ERROR, "Screamer: unsupported register at offset 0x%X", offset);
}
return 0;
}
void AwacsScreamer::snd_ctrl_write(uint32_t offset, uint32_t value, int size)
{
int subframe, reg_num;
uint16_t data;
switch (offset) {
case AWAC_SOUND_CTRL_REG:
this->snd_ctrl_reg = BYTESWAP_32(value);
LOG_F(9, "Screamer: new sound control value = 0x%X", this->snd_ctrl_reg);
break;
case AWAC_CODEC_CTRL_REG:
subframe = (value >> 14) & 3;
reg_num = (value >> 20) & 7;
data = ((value >> 8) & 0xF00) | ((value >> 24) & 0xFF);
LOG_F(9, "Screamer subframe = %d, reg = %d, data = %08X\n",
subframe, reg_num, data);
if (!subframe)
this->control_regs[reg_num] = data;
break;
default:
LOG_F(ERROR, "Screamer: unsupported register at offset 0x%X", offset);
}
}
void AwacsScreamer::open_stream(int sample_rate)
{
int err;
if ((err = this->snd_server->open_out_stream(sample_rate, (void *)this->dma_out_ch))) {
LOG_F(ERROR, "Screamer: unable to open sound output stream: %d", err);
this->out_stream_ready = false;
} else {
this->out_sample_rate = sample_rate;
this->out_stream_ready = true;
}
}
void AwacsScreamer::dma_start()
{
int err;
if (!this->out_stream_ready) {
this->open_stream(this->sr_table[(this->snd_ctrl_reg >> 8) & 7]);
} else if (this->out_sample_rate != this->sr_table[(this->snd_ctrl_reg >> 8) & 7]) {
snd_server->close_out_stream();
this->open_stream(this->sr_table[(this->snd_ctrl_reg >> 8) & 7]);
} else {
LOG_F(ERROR, "Screamer: unpausing attempted!");
return;
}
if (!this->out_stream_ready) {
return;
}
if ((err = snd_server->start_out_stream())) {
LOG_F(ERROR, "Screamer: could not start sound output stream");
}
}
void AwacsScreamer::dma_end()
{
}