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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
speaker.cpp
Speaker output sound device.
***************************************************************************/
#include "emu.h"
//**************************************************************************
// DEBUGGING
//**************************************************************************
#define VERBOSE (0)
#define VPRINTF(x) do { if (VERBOSE) osd_printf_debug x; } while (0)
//**************************************************************************
// GLOBAL VARIABLES
//**************************************************************************
// device type definition
const device_type SPEAKER = &device_creator<speaker_device>;
//**************************************************************************
// LIVE SPEAKER DEVICE
//**************************************************************************
//-------------------------------------------------
// speaker_device - constructor
//-------------------------------------------------
speaker_device::speaker_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
: device_t(mconfig, SPEAKER, "Speaker", tag, owner, clock, "speaker", __FILE__),
device_mixer_interface(mconfig, *this),
m_x(0.0),
m_y(0.0),
m_z(0.0)
#ifdef MAME_DEBUG
,
m_max_sample(0),
m_clipped_samples(0),
m_total_samples(0)
#endif
{
}
//-------------------------------------------------
// ~speaker_device - destructor
//-------------------------------------------------
speaker_device::~speaker_device()
{
#ifdef MAME_DEBUG
// log the maximum sample values for all speakers
if (m_max_sample > 0)
osd_printf_debug("Speaker \"%s\" - max = %d (gain *= %f) - %d%% samples clipped\n", tag(), m_max_sample, 32767.0 / (m_max_sample ? m_max_sample : 1), (int)((double)m_clipped_samples * 100.0 / m_total_samples));
#endif
}
//-------------------------------------------------
// static_set_position - configuration helper to
// set the speaker position
//-------------------------------------------------
void speaker_device::static_set_position(device_t &device, double x, double y, double z)
{
speaker_device &speaker = downcast<speaker_device &>(device);
speaker.m_x = x;
speaker.m_y = y;
speaker.m_z = z;
}
//-------------------------------------------------
// mix - mix in samples from the speaker's stream
//-------------------------------------------------
void speaker_device::mix(s32 *leftmix, s32 *rightmix, int &samples_this_update, bool suppress)
{
// skip if no stream
if (m_mixer_stream == nullptr)
return;
// update the stream, getting the start/end pointers around the operation
int numsamples;
const stream_sample_t *stream_buf = m_mixer_stream->output_since_last_update(0, numsamples);
// set or assert that all streams have the same count
if (samples_this_update == 0)
{
samples_this_update = numsamples;
// reset the mixing streams
memset(leftmix, 0, samples_this_update * sizeof(*leftmix));
memset(rightmix, 0, samples_this_update * sizeof(*rightmix));
}
assert(samples_this_update == numsamples);
#ifdef MAME_DEBUG
// debug version: keep track of the maximum sample
for (int sample = 0; sample < samples_this_update; sample++)
{
if (stream_buf[sample] > m_max_sample)
m_max_sample = stream_buf[sample];
else if (-stream_buf[sample] > m_max_sample)
m_max_sample = -stream_buf[sample];
if (stream_buf[sample] > 32767 || stream_buf[sample] < -32768)
m_clipped_samples++;
m_total_samples++;
}
#endif
// mix if sound is enabled
if (!suppress)
{
// if the speaker is centered, send to both left and right
if (m_x == 0)
for (int sample = 0; sample < samples_this_update; sample++)
{
leftmix[sample] += stream_buf[sample];
rightmix[sample] += stream_buf[sample];
}
// if the speaker is to the left, send only to the left
else if (m_x < 0)
for (int sample = 0; sample < samples_this_update; sample++)
leftmix[sample] += stream_buf[sample];
// if the speaker is to the right, send only to the right
else
for (int sample = 0; sample < samples_this_update; sample++)
rightmix[sample] += stream_buf[sample];
}
}
//-------------------------------------------------
// device_start - handle device startup
//-------------------------------------------------
void speaker_device::device_start()
{
// dummy save to make device.c happy
}
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