Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/sound/oss/emu10k1/passthrough.h b/sound/oss/emu10k1/passthrough.h
new file mode 100644
index 0000000..420cc97
--- /dev/null
+++ b/sound/oss/emu10k1/passthrough.h
@@ -0,0 +1,99 @@
+/*
+ **********************************************************************
+ * passthrough.h -- Emu10k1 digital passthrough header file
+ * Copyright (C) 2001 Juha Yrjölä <jyrjola@cc.hut.fi>
+ *
+ **********************************************************************
+ *
+ * Date Author Summary of changes
+ * ---- ------ ------------------
+ * May 15, 2001 Juha Yrjölä base code release
+ *
+ **********************************************************************
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the Free
+ * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
+ * USA.
+ *
+ **********************************************************************
+ */
+
+#ifndef _PASSTHROUGH_H
+#define _PASSTHROUGH_H
+
+#include "audio.h"
+
+/* number of 16-bit stereo samples in XTRAM buffer */
+#define PT_SAMPLES 0x8000
+#define PT_BLOCKSAMPLES 0x400
+#define PT_BLOCKSIZE (PT_BLOCKSAMPLES*4)
+#define PT_BLOCKSIZE_LOG2 12
+#define PT_BLOCKCOUNT (PT_SAMPLES/PT_BLOCKSAMPLES)
+#define PT_INITPTR (PT_SAMPLES/2-1)
+
+#define PT_STATE_INACTIVE 0
+#define PT_STATE_ACTIVATED 1
+#define PT_STATE_PLAYING 2
+
+/* passthrough struct */
+struct pt_data
+{
+ u8 selected, state, spcs_to_use;
+ int intr_gpr, enable_gpr, pos_gpr;
+ u32 blocks_played, blocks_copied, old_spcs[3];
+ u32 playptr, copyptr;
+ u32 prepend_size;
+ u8 *buf;
+ u8 ac3data;
+
+ char *patch_name, *intr_gpr_name, *enable_gpr_name, *pos_gpr_name;
+
+ wait_queue_head_t wait;
+ spinlock_t lock;
+};
+
+/*
+ Passthrough can be done in two methods:
+
+ Method 1 : tram
+ In original emu10k1, we couldn't bypass the sample rate converters. Even at 48kHz
+ (the internal sample rate of the emu10k1) the samples would get messed up.
+ To over come this, samples are copied into the tram and a special dsp patch copies
+ the samples out and generates interrupts when a block has finnished playing.
+
+ Method 2 : Interpolator bypass
+
+ Creative fixed the sample rate convert problem in emu10k1 rev 7 and higher
+ (including the emu10k2 (audigy)). This allows us to use the regular, and much simpler
+ playback method.
+
+
+ In both methods, dsp code is used to mux audio and passthrough. This ensures that the spdif
+ doesn't receive audio and pasthrough data at the same time. The spdif flag SPCS_NOTAUDIODATA
+ is set to tell
+
+ */
+
+// emu10k1 revs greater than or equal to 7 can use method2
+
+#define USE_PT_METHOD2 (card->is_audigy)
+#define USE_PT_METHOD1 !USE_PT_METHOD2
+
+ssize_t emu10k1_pt_write(struct file *file, const char __user *buf, size_t count);
+
+int emu10k1_pt_setup(struct emu10k1_wavedevice *wave_dev);
+void emu10k1_pt_stop(struct emu10k1_card *card);
+void emu10k1_pt_waveout_update(struct emu10k1_wavedevice *wave_dev);
+
+#endif /* _PASSTHROUGH_H */