diff options
Diffstat (limited to 'src/devices/sound/wave.c')
-rw-r--r-- | src/devices/sound/wave.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/src/devices/sound/wave.c b/src/devices/sound/wave.c new file mode 100644 index 00000000000..76f9bdda8d6 --- /dev/null +++ b/src/devices/sound/wave.c @@ -0,0 +1,110 @@ +// 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<wave_device &>(device); + wave.m_cassette_tag = cassette_tag; +} + +const device_type WAVE = &device_creator<wave_device>; + +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<cassette_image_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); + } +} |