// license:BSD-3-Clause // copyright-holders:Nathan Woods /*************************************************************************** wave.c 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" #define ALWAYS_PLAY_SOUND 0 void wave_device::static_set_cassette_tag(device_t &device, const char *cassette_tag) { wave_device &wave = downcast(device); wave.m_cassette_tag = cassette_tag; } const device_type WAVE = &device_creator; wave_device::wave_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : device_t(mconfig, WAVE, "Wave", tag, owner, clock, "wave", __FILE__), device_sound_interface(mconfig, *this) { m_cassette_tag = 0; } //------------------------------------------------- // device_config_complete - perform any // operations now that the configuration is // complete //------------------------------------------------- void wave_device::device_config_complete() { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void wave_device::device_start() { speaker_device_iterator spkiter(machine().root_device()); int speakers = spkiter.count(); if (speakers > 1) machine().sound().stream_alloc(*this, 0, 2, machine().sample_rate()); else machine().sound().stream_alloc(*this, 0, 1, machine().sample_rate()); m_cass = machine().device(m_cassette_tag); } //------------------------------------------------- // sound_stream_update - handle a stream update //------------------------------------------------- void wave_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) { cassette_state state; double time_index; double duration; stream_sample_t *left_buffer = outputs[0]; stream_sample_t *right_buffer = NULL; int i; speaker_device_iterator spkiter(m_cass->machine().root_device()); int speakers = spkiter.count(); if (speakers>1) right_buffer = outputs[1]; state = m_cass->get_state(); state = (cassette_state)(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(); time_index = m_cass->get_position(); duration = ((double) samples) / m_cass->machine().sample_rate(); cassette_get_samples(cassette, 0, time_index, duration, samples, 2, left_buffer, CASSETTE_WAVEFORM_16BIT); if (speakers > 1) cassette_get_samples(cassette, 1, time_index, duration, samples, 2, right_buffer, CASSETTE_WAVEFORM_16BIT); for (i = samples - 1; i >= 0; i--) { left_buffer[i] = ((INT16 *) left_buffer)[i]; if (speakers > 1) right_buffer[i] = ((INT16 *) right_buffer)[i]; } } else { memset(left_buffer, 0, sizeof(*left_buffer) * samples); if (speakers > 1) memset(right_buffer, 0, sizeof(*right_buffer) * samples); } }