// license:BSD-3-Clause // copyright-holders:Nathan Woods /*************************************************************************** Cassette wave samples sound driver Code that interfaces functions to handle loading, creation, recording and playback of wave samples for IO_CASSETTE 2010-06-19 - Found that since 0.132, the right channel is badly out of sync on a mono system, causing bad sound. Added code to disable the second channel on a mono system. ****************************************************************************/ #include "emu.h" #include "wave.h" #include "speaker.h" #define ALWAYS_PLAY_SOUND 0 DEFINE_DEVICE_TYPE(WAVE, wave_device, "wave", "Cassette Sound") wave_device::wave_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, WAVE, tag, owner, clock) , device_sound_interface(mconfig, *this) , m_cass(*this, finder_base::DUMMY_TAG) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void wave_device::device_start() { stream_alloc(0, 2, machine().sample_rate()); } //------------------------------------------------- // sound_stream_update - handle a stream update //------------------------------------------------- void wave_device::sound_stream_update(sound_stream &stream) { cassette_state state = m_cass->get_state() & (CASSETTE_MASK_UISTATE | CASSETTE_MASK_MOTOR | CASSETTE_MASK_SPEAKER); if (m_cass->exists() && (ALWAYS_PLAY_SOUND || (state == (CASSETTE_PLAY | CASSETTE_MOTOR_ENABLED | CASSETTE_SPEAKER_ENABLED)))) { cassette_image *cassette = m_cass->get_image(); double time_index = m_cass->get_position(); double duration = double(stream.samples()) / stream.sample_rate(); if (m_sample_buf.size() < stream.samples()) m_sample_buf.resize(stream.samples()); for (int ch = 0; ch < 2; ch++) { cassette->get_samples(ch, time_index, duration, stream.samples(), 2, &m_sample_buf[0], cassette_image::WAVEFORM_16BIT); for (int sampindex = 0; sampindex < stream.samples(); sampindex++) stream.put_int(ch, sampindex, m_sample_buf[sampindex], 32768); } } }