1 files changed, 115 insertions, 0 deletions
diff --git a/kernel/framework/vmix_core/playmix.inc b/kernel/framework/vmix_core/playmix.inc
new file mode 100644
index 0000000..50d07f5
--- /dev/null
+++ b/kernel/framework/vmix_core/playmix.inc
@@ -0,0 +1,115 @@
+#ifdef CONFIG_OSS_VMIX_FLOAT
+/*
+ * Purpose: Application to local playback buffer import routine for vmix (FP)
+ */
+/*
+ *
+ * This file is part of Open Sound System.
+ *
+ * Copyright (C) 4Front Technologies 1996-2008.
+ *
+ * This this source file is released under GPL v2 license (no other versions).
+ * See the COPYING file included in the main directory of this source
+ * distribution for the license terms and conditions.
+ *
+ */
+
+/*
+ * Mixing function for virtual devices
+ */
+
+vmix_mixer_t *mixer = portc->mixer;
+vmix_engine_t *eng = &mixer->play_engine;
+
+dmap_t *dmap = audio_engines[portc->audio_dev]->dmap_out;
+
+int frame_size;
+
+int inptr, inmax;
+int used_channels;
+int i, ch, nch;
+double vol;
+
+/*
+ * Initial setup
+ */
+
+frame_size = sizeof (*inp);
+
+inmax = dmap->bytes_in_use / frame_size;
+inptr = portc->play_dma_pointer / frame_size;
+
+inp = (BUFFER_TYPE) dmap->dmabuf;
+
+used_channels = portc->channels;
+if (used_channels > eng->channels)
+  used_channels = eng->channels;
+
+/* ignored_channels = portc->channels - used_channels; */
+
+/*
+ * Handle mono playback by playing the mono stream twice (for left and right ch)
+ */
+nch=used_channels;
+if (nch<2)nch=2;
+
+/*
+ * Do the mixing
+ */
+for (ch = 0; ch < nch; ch++)
+  {
+    int ip = inptr + (ch%used_channels);
+    double vu = portc->vu[ch % 2];
+    float *chbuf = eng->chbufs[ch+portc->play_choffs];
+
+    i = portc->volume[ch%2];
+    vol = vmix_db_table[i / 5];
+
+    vu = vu / 255.0;
+
+    for (i = 0; i < nsamples; i++)
+      {
+	double tmp;
+
+#if 0 && defined(SINE_DEBUG)
+	if (ch > 1)
+	  tmp = 0.0;
+	else
+	  tmp = sine_table[sine_phase[ch]];
+	sine_phase[ch] = (sine_phase[ch] + 1) % SINE_SIZE;
+#else
+	/*
+	 * Convert the sample to right endianess. 
+	 */
+	tmp = VMIX_BYTESWAP (inp[ip]);
+	tmp = tmp * range;
+#endif
+	tmp = tmp * vol;
+
+	*chbuf++ += tmp;
+	ip = (ip + portc->channels) % inmax;
+
+	/* VU meter */
+	if (tmp < 0.0)
+	  tmp = -tmp;
+	if (tmp > vu)
+	  vu = tmp;
+      }
+
+    if (ch < 2)
+      {				/* Save left/right VU meters */
+	vu = vu * 255.0;
+	portc->vu[ch] = (int)vu;
+      }
+  }
+
+/*
+ * Finally save the state variables
+ */
+
+portc->play_dma_pointer =
+  (portc->play_dma_pointer +
+   nsamples * frame_size * portc->channels) % dmap->bytes_in_use;
+#else
+#include "playmix_int.inc"
+#endif