summaryrefslogtreecommitdiffstatshomepage
path: root/trunk/src/emu/sound/wave.c
diff options
context:
space:
mode:
Diffstat (limited to 'trunk/src/emu/sound/wave.c')
-rw-r--r--trunk/src/emu/sound/wave.c112
1 files changed, 112 insertions, 0 deletions
diff --git a/trunk/src/emu/sound/wave.c b/trunk/src/emu/sound/wave.c
new file mode 100644
index 00000000000..1d879de288b
--- /dev/null
+++ b/trunk/src/emu/sound/wave.c
@@ -0,0 +1,112 @@
+/***************************************************************************
+
+ 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 "imagedev/cassette.h"
+#include "wave.h"
+
+#define ALWAYS_PLAY_SOUND 0
+
+static STREAM_UPDATE( wave_sound_update )
+{
+ cassette_image_device *cass = (cassette_image_device *)param;
+ cassette_image *cassette;
+ 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(cass->machine().root_device());
+ int speakers = spkiter.count();
+ if (speakers>1)
+ right_buffer = outputs[1];
+
+ state = cass->get_state();
+
+ state = (cassette_state)(state & (CASSETTE_MASK_UISTATE | CASSETTE_MASK_MOTOR | CASSETTE_MASK_SPEAKER));
+
+ if (cass->exists() && (ALWAYS_PLAY_SOUND || (state == (CASSETTE_PLAY | CASSETTE_MOTOR_ENABLED | CASSETTE_SPEAKER_ENABLED))))
+ {
+ cassette = cass->get_image();
+ time_index = cass->get_position();
+ duration = ((double) samples) / 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);
+ }
+}
+
+
+
+static DEVICE_START( wave )
+{
+ cassette_image_device *image = NULL;
+
+ assert( device != NULL );
+ assert( device->static_config() != NULL );
+ speaker_device_iterator spkiter(device->machine().root_device());
+ int speakers = spkiter.count();
+ image = dynamic_cast<cassette_image_device *>(device->machine().device( (const char *)device->static_config()));
+ if (speakers > 1)
+ device->machine().sound().stream_alloc(*device, 0, 2, device->machine().sample_rate(), (void *)image, wave_sound_update);
+ else
+ device->machine().sound().stream_alloc(*device, 0, 1, device->machine().sample_rate(), (void *)image, wave_sound_update);
+}
+
+
+
+/**************************************************************************
+ * Generic get_info
+ **************************************************************************/
+
+DEVICE_GET_INFO( wave )
+{
+ switch (state)
+ {
+ /* --- the following bits of info are returned as 64-bit signed integers --- */
+ case DEVINFO_INT_TOKEN_BYTES: info->i = 0; break;
+
+ /* --- the following bits of info are returned as pointers to data or functions --- */
+ case DEVINFO_FCT_START: info->start = DEVICE_START_NAME( wave ); break;
+ case DEVINFO_FCT_STOP: /* nothing */ break;
+ case DEVINFO_FCT_RESET: /* nothing */ break;
+
+ /* --- the following bits of info are returned as NULL-terminated strings --- */
+ case DEVINFO_STR_NAME: strcpy(info->s, "Cassette"); break;
+ case DEVINFO_STR_FAMILY: strcpy(info->s, "Cassette"); break;
+ case DEVINFO_STR_VERSION: strcpy(info->s, "1.0"); break;
+ case DEVINFO_STR_SOURCE_FILE: strcpy(info->s, __FILE__); break;
+ case DEVINFO_STR_CREDITS: strcpy(info->s, "Copyright The MESS Team"); break;
+ }
+}
+
+
+DEFINE_LEGACY_SOUND_DEVICE(WAVE, wave);