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https://github.com/holub/mame
synced 2025-07-03 17:08:39 +03:00
sega/dsb2.cpp: add basic MPEG playback
This commit is contained in:
angelosa
parent
3103e0c799
commit
16cc6c9d80
@ -1,12 +1,10 @@
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// license:BSD-3-Clause
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// copyright-holders:
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/***************************************************************************
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/**************************************************************************************************
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Sega Z80 Digital Sound Board
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Sega Digital Sound Board 2
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used for Model 1/2/3
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***************************************************************************/
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**************************************************************************************************/
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#include "emu.h"
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@ -28,14 +26,15 @@ dsb2_device::dsb2_device(const machine_config &mconfig, const char *tag, device_
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m_mp_end(0),
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m_mp_vol(0x7f),
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m_mp_pan(0),
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m_mp_state(0),
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m_lp_start(0),
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m_lp_end(0),
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m_start(0),
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m_end(0),
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m_mp_pos(0),
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m_audio_pos(0),
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m_audio_avail(0)
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m_audio_avail(0),
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m_command(mpeg_command_t::IDLE),
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m_player(mpeg_player_t::NOT_PLAYING)
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{
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}
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@ -47,7 +46,7 @@ void dsb2_device::dsb2_map(address_map &map)
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// map(0xd00001) system control?
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// map(0xd20001) flsbeats reads here
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// map(0xe00001) acknowledge FIFO writes?
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// map(0xe00003) MPEG FIFO writes
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map(0xe00003, 0xe00003).w(FUNC(dsb2_device::fifo_w));
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// MPEG status
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map(0xe80001, 0xe80001).lr8(NAME([] () { return 0x01; }));
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map(0xf00000, 0xf1ffff).ram();
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@ -56,7 +55,6 @@ void dsb2_device::dsb2_map(address_map &map)
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void dsb2_device::device_add_mconfig(machine_config &config)
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{
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// TODO: unknown clocks
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// TODO: 1 kHz timer for irq2
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M68000(config, m_ourcpu, 8000000);
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m_ourcpu->set_addrmap(AS_PROGRAM, &dsb2_device::dsb2_map);
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@ -75,11 +73,14 @@ void dsb2_device::device_start()
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m_decoder.reset(new mpeg_audio(&m_mpeg_rom[0], mpeg_audio::L2, false, 0));
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stream_alloc(0, 2, 32000);
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m_timer_1kHz = timer_alloc(FUNC(dsb2_device::timer_irq_cb), this);
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save_item(NAME(m_mp_start));
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save_item(NAME(m_mp_end));
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save_item(NAME(m_mp_vol));
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save_item(NAME(m_mp_pan));
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save_item(NAME(m_mp_state));
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// save_item(NAME(m_command));
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// save_item(NAME(m_player));
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save_item(NAME(m_lp_start));
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save_item(NAME(m_lp_end));
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save_item(NAME(m_start));
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@ -95,11 +96,13 @@ void dsb2_device::device_reset()
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m_audio_pos = m_audio_avail = 0;
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std::fill(std::begin(m_audio_buf), std::end(m_audio_buf), 0);
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m_mp_vol = 0x7f;
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m_mp_state = 0;
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m_command = IDLE;
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m_player = NOT_PLAYING;
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m_uart->write_cts(0);
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}
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m_timer_1kHz->adjust(attotime::from_hz(1000), 0, attotime::from_hz(1000));
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}
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void dsb2_device::device_stop()
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{
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@ -116,10 +119,144 @@ void dsb2_device::output_txd(int state)
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m_rxd_handler(state);
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}
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TIMER_CALLBACK_MEMBER(dsb2_device::timer_irq_cb)
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{
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m_ourcpu->set_input_line(2, HOLD_LINE);
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}
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void dsb2_device::fifo_w(offs_t offset, u8 data)
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{
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switch(m_command)
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{
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case mpeg_command_t::START_ADDRESS_HI:
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m_start &= 0x00ffff;
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m_start |= (uint32_t)data << 16;
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m_command = mpeg_command_t::START_ADDRESS_MD;
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break;
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case mpeg_command_t::START_ADDRESS_MD:
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m_start &= 0xff00ff;
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m_start |= (uint32_t)data << 8;
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m_command = mpeg_command_t::START_ADDRESS_LO;
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break;
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case mpeg_command_t::START_ADDRESS_LO:
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m_start &= 0xffff00;
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m_start |= data;
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m_mp_start = m_start;
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m_command = mpeg_command_t::IDLE;
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break;
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case mpeg_command_t::END_ADDRESS_HI:
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m_end &= 0x00ffff;
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m_end |= (uint32_t)data << 16;
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m_command = mpeg_command_t::END_ADDRESS_MD;
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break;
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case mpeg_command_t::END_ADDRESS_MD:
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m_end &= 0xff00ff;
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m_end |= (uint32_t)data << 8;
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m_command = mpeg_command_t::END_ADDRESS_LO;
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break;
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case mpeg_command_t::END_ADDRESS_LO:
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m_end &= 0xffff00;
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m_end |= data;
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m_mp_end = m_end;
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m_command = mpeg_command_t::IDLE;
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break;
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case mpeg_command_t::IDLE:
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default:
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{
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if ((data & 0xfe) == 0x14)
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m_command = mpeg_command_t::START_ADDRESS_HI;
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if ((data & 0xfe) == 0x24)
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m_command = mpeg_command_t::END_ADDRESS_HI;
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if ((data & 0xfe) == 0x74)
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{
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m_mp_pos = m_mp_start * 8;
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m_player = mpeg_player_t::PLAYING;
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}
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if ((data & 0xfe) == 0x84)
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{
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m_player = mpeg_player_t::NOT_PLAYING;
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m_audio_pos = m_audio_avail = 0;
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}
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}
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}
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}
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void dsb2_device::sound_stream_update(sound_stream &stream)
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{
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//int samples = stream.samples();
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//int sampindex = 0;
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int samples = stream.samples();
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int sampindex = 0;
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for (;;)
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{
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while (samples && (m_audio_pos < m_audio_avail))
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{
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switch (m_mp_pan)
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{
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case 0: // stereo
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stream.put_int(0, sampindex, m_audio_buf[m_audio_pos*2] * m_mp_vol, 32768 * 128);
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stream.put_int(1, sampindex, m_audio_buf[m_audio_pos*2+1] * m_mp_vol, 32768 * 128);
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sampindex++;
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break;
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// ...
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case 1: // left only
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stream.put_int(0, sampindex, m_audio_buf[m_audio_pos*2] * m_mp_vol, 32768 * 128);
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stream.put_int(1, sampindex, m_audio_buf[m_audio_pos*2] * m_mp_vol, 32768 * 128);
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sampindex++;
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break;
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case 2: // right only
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stream.put_int(0, sampindex, m_audio_buf[m_audio_pos*2+1] * m_mp_vol, 32768 * 128);
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stream.put_int(1, sampindex, m_audio_buf[m_audio_pos*2+1] * m_mp_vol, 32768 * 128);
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sampindex++;
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break;
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}
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m_audio_pos++;
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samples--;
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}
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if (!samples)
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{
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break;
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}
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if (m_player == mpeg_player_t::NOT_PLAYING)
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{
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break;
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}
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else
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{
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int sample_rate, channel_count;
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bool const ok = m_decoder->decode_buffer(m_mp_pos, m_mp_end * 8, m_audio_buf, m_audio_avail, sample_rate, channel_count);
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if (ok)
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{
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m_audio_pos = 0;
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}
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else
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{
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//if (m_mp_state == 2)
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//{
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// if (m_mp_pos == m_lp_start * 8)
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// {
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// // We're looping on un-decodable crap, abort abort abort
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// m_mp_state = 0;
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// }
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// m_mp_pos = m_lp_start * 8;
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//
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// if (m_lp_end)
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// {
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// m_mp_end = m_lp_end;
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// }
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//}
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//else
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{
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m_player = mpeg_player_t::NOT_PLAYING;
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}
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}
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}
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}
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}
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@ -13,10 +13,6 @@
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#include <memory>
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//**************************************************************************
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// TYPE DEFINITIONS
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//**************************************************************************
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class dsb2_device : public device_t, public device_sound_interface
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{
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public:
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@ -47,19 +43,36 @@ private:
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std::unique_ptr<mpeg_audio> m_decoder;
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int16_t m_audio_buf[1152*2];
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uint32_t m_mp_start, m_mp_end, m_mp_vol, m_mp_pan, m_mp_state, m_lp_start, m_lp_end, m_start, m_end;
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uint32_t m_mp_start, m_mp_end, m_mp_vol, m_mp_pan, m_lp_start, m_lp_end, m_start, m_end;
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int32_t m_mp_pos, m_audio_pos, m_audio_avail;
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emu_timer *m_timer_1kHz;
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TIMER_CALLBACK_MEMBER(timer_irq_cb);
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void output_txd(int state);
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// void mpeg_trigger_w(uint8_t data);
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// void mpeg_start_w(offs_t offset, uint8_t data);
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// void mpeg_end_w(offs_t offset, uint8_t data);
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// void mpeg_volume_w(uint8_t data);
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// void mpeg_stereo_w(uint8_t data);
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// uint8_t mpeg_pos_r(offs_t offset);
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void dsb2_map(address_map &map) ATTR_COLD;
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enum mpeg_command_t : u8 {
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IDLE,
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START_ADDRESS_HI,
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START_ADDRESS_MD,
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START_ADDRESS_LO,
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END_ADDRESS_HI,
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END_ADDRESS_MD,
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END_ADDRESS_LO
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};
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enum mpeg_player_t : u8 {
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NOT_PLAYING,
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PLAYING
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};
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mpeg_command_t m_command;
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mpeg_player_t m_player;
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void fifo_w(offs_t offset, u8 data);
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};
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