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// 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"
#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()
{
speaker_device_iterator spkiter(*owner());
int speakers = spkiter.count();
if (speakers > 1)
stream_alloc_legacy(0, 2, machine().sample_rate());
else
stream_alloc_legacy(0, 1, machine().sample_rate());
}
//-------------------------------------------------
// sound_stream_update_legacy - handle a stream update
//-------------------------------------------------
void wave_device::sound_stream_update_legacy(sound_stream &stream, stream_sample_t const * const *inputs, stream_sample_t * const *outputs, int samples)
{
stream_sample_t *left_buffer = outputs[0];
stream_sample_t *right_buffer = nullptr;
speaker_device_iterator spkiter(*owner());
int speakers = spkiter.count();
if (speakers > 1)
right_buffer = outputs[1];
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(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 (int i = samples - 1; i >= 0; i--)
{
left_buffer[i] = ((int16_t *) left_buffer)[i];
if (speakers > 1)
right_buffer[i] = ((int16_t *) right_buffer)[i];
}
}
else
{
memset(left_buffer, 0, sizeof(*left_buffer) * samples);
if (speakers > 1)
memset(right_buffer, 0, sizeof(*right_buffer) * samples);
}
}
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