diff options
Diffstat (limited to 'src/emu/sound/awacs.c')
-rw-r--r-- | src/emu/sound/awacs.c | 117 |
1 files changed, 58 insertions, 59 deletions
diff --git a/src/emu/sound/awacs.c b/src/emu/sound/awacs.c index 6664082bd6c..a7b8dd4faea 100644 --- a/src/emu/sound/awacs.c +++ b/src/emu/sound/awacs.c @@ -24,7 +24,7 @@ const device_type AWACS = &device_creator<awacs_device>; awacs_device::awacs_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : device_t(mconfig, AWACS, "AWACS", tag, owner, clock), - device_sound_interface(mconfig, *this) + device_sound_interface(mconfig, *this) { } @@ -57,12 +57,12 @@ void awacs_device::device_reset() memset(m_regs, 0, sizeof(m_regs)); - m_play_ptr = 0; - m_buffer_size = 0; - m_playback_enable = false; - m_dma_space = NULL; - m_dma_offset_0 = m_dma_offset_1 = 0; - m_buffer_num = 0; + m_play_ptr = 0; + m_buffer_size = 0; + m_playback_enable = false; + m_dma_space = NULL; + m_dma_offset_0 = m_dma_offset_1 = 0; + m_buffer_num = 0; } //------------------------------------------------- @@ -82,38 +82,38 @@ void awacs_device::device_timer(emu_timer &timer, device_timer_id tid, int param void awacs_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) { stream_sample_t *outL, *outR; - int offset = (m_buffer_num == 0) ? m_dma_offset_0 : m_dma_offset_1; + int offset = (m_buffer_num == 0) ? m_dma_offset_0 : m_dma_offset_1; outL = outputs[0]; outR = outputs[1]; - if (m_playback_enable) - { - for (int i = 0; i < samples; i++) - { - outL[i] = (INT16)m_dma_space->read_word(offset + m_play_ptr); - outR[i] = (INT16)m_dma_space->read_word(offset + m_play_ptr + 2); - m_play_ptr += 4; - } - - // out of buffer? - if (m_play_ptr >= m_buffer_size) - { - UINT8 bufflag[2] = { 0x40, 0x80 }; - - m_regs[0x18] |= bufflag[m_buffer_num]; - m_buffer_num ^= 1; - m_play_ptr = 0; - } - } - else - { - for (int i = 0; i < samples; i++) - { - outL[i] = 0; - outR[i] = 0; - } - } + if (m_playback_enable) + { + for (int i = 0; i < samples; i++) + { + outL[i] = (INT16)m_dma_space->read_word(offset + m_play_ptr); + outR[i] = (INT16)m_dma_space->read_word(offset + m_play_ptr + 2); + m_play_ptr += 4; + } + + // out of buffer? + if (m_play_ptr >= m_buffer_size) + { + UINT8 bufflag[2] = { 0x40, 0x80 }; + + m_regs[0x18] |= bufflag[m_buffer_num]; + m_buffer_num ^= 1; + m_play_ptr = 0; + } + } + else + { + for (int i = 0; i < samples; i++) + { + outL[i] = 0; + outR[i] = 0; + } + } } //------------------------------------------------- @@ -122,7 +122,7 @@ void awacs_device::sound_stream_update(sound_stream &stream, stream_sample_t **i READ8_MEMBER( awacs_device::read ) { - return m_regs[offset]; + return m_regs[offset]; } //------------------------------------------------- @@ -131,20 +131,20 @@ READ8_MEMBER( awacs_device::read ) WRITE8_MEMBER( awacs_device::write ) { - switch (offset) - { - case 0x8: - case 0x9: - m_regs[offset] = data; - m_buffer_size = (m_regs[8]<<6) | (m_regs[9]>>2); + switch (offset) + { + case 0x8: + case 0x9: + m_regs[offset] = data; + m_buffer_size = (m_regs[8]<<6) | (m_regs[9]>>2); // printf("buffer size = %x samples, %x bytes\n", m_buffer_size, m_buffer_size*4); - m_buffer_size *= 4; // samples * 16 bits * stereo - break; + m_buffer_size *= 4; // samples * 16 bits * stereo + break; - case 0x10: + case 0x10: { - static const int rates[4] = { 22100, 29400, 44100, 22100 }; - m_stream->set_sample_rate(rates[(data>>1)&3]); + static const int rates[4] = { 22100, 29400, 44100, 22100 }; + m_stream->set_sample_rate(rates[(data>>1)&3]); // printf("rate %d, enable: %d\n", rates[(data>>1)&3], data & 1); m_playback_enable = (data & 1) ? true : false; @@ -154,22 +154,21 @@ WRITE8_MEMBER( awacs_device::write ) m_buffer_num = 0; } } - break; + break; - case 0x18: - m_regs[offset] &= 0xf0; - m_regs[offset] |= (data & 0x0f); - m_regs[offset] &= ~(data & 0xf0); - return; - } + case 0x18: + m_regs[offset] &= 0xf0; + m_regs[offset] |= (data & 0x0f); + m_regs[offset] &= ~(data & 0xf0); + return; + } - m_regs[offset] = data; + m_regs[offset] = data; } void awacs_device::set_dma_base(address_space &space, int offset0, int offset1) { - m_dma_space = &space; - m_dma_offset_0 = offset0; - m_dma_offset_1 = offset1; + m_dma_space = &space; + m_dma_offset_0 = offset0; + m_dma_offset_1 = offset1; } - |