From c654c7630aad220a4935c34b076e107b6b0561a5 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Tue, 9 Apr 2013 01:24:52 +0200
Subject: pcm_*: move to src/pcm/

---
 src/dsd2pcm/dsd2pcm.c | 184 --------------------------------------------------
 1 file changed, 184 deletions(-)
 delete mode 100644 src/dsd2pcm/dsd2pcm.c

(limited to 'src/dsd2pcm/dsd2pcm.c')

diff --git a/src/dsd2pcm/dsd2pcm.c b/src/dsd2pcm/dsd2pcm.c
deleted file mode 100644
index 4c7640853..000000000
--- a/src/dsd2pcm/dsd2pcm.c
+++ /dev/null
@@ -1,184 +0,0 @@
-#include "util/bit_reverse.h"
-
-#include <stdlib.h>
-#include <string.h>
-
-#include "dsd2pcm.h"
-
-#define HTAPS    48             /* number of FIR constants */
-#define FIFOSIZE 16             /* must be a power of two */
-#define FIFOMASK (FIFOSIZE-1)   /* bit mask for FIFO offsets */
-#define CTABLES ((HTAPS+7)/8)   /* number of "8 MACs" lookup tables */
-
-#if FIFOSIZE*8 < HTAPS*2
-#error "FIFOSIZE too small"
-#endif
-
-/*
- * Properties of this 96-tap lowpass filter when applied on a signal
- * with sampling rate of 44100*64 Hz:
- *
- * () has a delay of 17 microseconds.
- *
- * () flat response up to 48 kHz
- *
- * () if you downsample afterwards by a factor of 8, the
- *    spectrum below 70 kHz is practically alias-free.
- *
- * () stopband rejection is about 160 dB
- *
- * The coefficient tables ("ctables") take only 6 Kibi Bytes and
- * should fit into a modern processor's fast cache.
- */
-
-/*
- * The 2nd half (48 coeffs) of a 96-tap symmetric lowpass filter
- */
-static const double htaps[HTAPS] = {
-  0.09950731974056658,
-  0.09562845727714668,
-  0.08819647126516944,
-  0.07782552527068175,
-  0.06534876523171299,
-  0.05172629311427257,
-  0.0379429484910187,
-  0.02490921351762261,
-  0.0133774746265897,
-  0.003883043418804416,
- -0.003284703416210726,
- -0.008080250212687497,
- -0.01067241812471033,
- -0.01139427235000863,
- -0.0106813877974587,
- -0.009007905078766049,
- -0.006828859761015335,
- -0.004535184322001496,
- -0.002425035959059578,
- -0.0006922187080790708,
-  0.0005700762133516592,
-  0.001353838005269448,
-  0.001713709169690937,
-  0.001742046839472948,
-  0.001545601648013235,
-  0.001226696225277855,
-  0.0008704322683580222,
-  0.0005381636200535649,
-  0.000266446345425276,
-  7.002968738383528e-05,
- -5.279407053811266e-05,
- -0.0001140625650874684,
- -0.0001304796361231895,
- -0.0001189970287491285,
- -9.396247155265073e-05,
- -6.577634378272832e-05,
- -4.07492895872535e-05,
- -2.17407957554587e-05,
- -9.163058931391722e-06,
- -2.017460145032201e-06,
-  1.249721855219005e-06,
-  2.166655190537392e-06,
-  1.930520892991082e-06,
-  1.319400334374195e-06,
-  7.410039764949091e-07,
-  3.423230509967409e-07,
-  1.244182214744588e-07,
-  3.130441005359396e-08
-};
-
-static float ctables[CTABLES][256];
-static int precalculated = 0;
-
-static void precalc(void)
-{
-	int t, e, m, k;
-	double acc;
-	if (precalculated) return;
-	for (t=0; t<CTABLES; ++t) {
-		k = HTAPS - t*8;
-		if (k>8) k=8;
-		for (e=0; e<256; ++e) {
-			acc = 0.0;
-			for (m=0; m<k; ++m) {
-				acc += (((e >> (7-m)) & 1)*2-1) * htaps[t*8+m];
-			}
-			ctables[CTABLES-1-t][e] = (float)acc;
-		}
-	}
-	precalculated = 1;
-}
-
-struct dsd2pcm_ctx_s
-{
-	unsigned char fifo[FIFOSIZE];
-	unsigned fifopos;
-};
-
-extern dsd2pcm_ctx* dsd2pcm_init(void)
-{
-	dsd2pcm_ctx* ptr;
-	if (!precalculated) precalc();
-	ptr = (dsd2pcm_ctx*) malloc(sizeof(dsd2pcm_ctx));
-	if (ptr) dsd2pcm_reset(ptr);
-	return ptr;
-}
-
-extern void dsd2pcm_destroy(dsd2pcm_ctx* ptr)
-{
-	free(ptr);
-}
-
-extern dsd2pcm_ctx* dsd2pcm_clone(dsd2pcm_ctx* ptr)
-{
-	dsd2pcm_ctx* p2;
-	p2 = (dsd2pcm_ctx*) malloc(sizeof(dsd2pcm_ctx));
-	if (p2) {
-		memcpy(p2,ptr,sizeof(dsd2pcm_ctx));
-	}
-	return p2;
-}
-
-extern void dsd2pcm_reset(dsd2pcm_ctx* ptr)
-{
-	int i;
-	for (i=0; i<FIFOSIZE; ++i)
-		ptr->fifo[i] = 0x69; /* my favorite silence pattern */
-	ptr->fifopos = 0;
-	/* 0x69 = 01101001
-	 * This pattern "on repeat" makes a low energy 352.8 kHz tone
-	 * and a high energy 1.0584 MHz tone which should be filtered
-	 * out completely by any playback system --> silence
-	 */
-}
-
-extern void dsd2pcm_translate(
-	dsd2pcm_ctx* ptr,
-	size_t samples,
-	const unsigned char *src, ptrdiff_t src_stride,
-	int lsbf,
-	float *dst, ptrdiff_t dst_stride)
-{
-	unsigned ffp;
-	unsigned i;
-	unsigned bite1, bite2;
-	unsigned char* p;
-	double acc;
-	ffp = ptr->fifopos;
-	lsbf = lsbf ? 1 : 0;
-	while (samples-- > 0) {
-		bite1 = *src & 0xFFu;
-		if (lsbf) bite1 = bit_reverse(bite1);
-		ptr->fifo[ffp] = bite1; src += src_stride;
-		p = ptr->fifo + ((ffp-CTABLES) & FIFOMASK);
-		*p = bit_reverse(*p);
-		acc = 0;
-		for (i=0; i<CTABLES; ++i) {
-			bite1 = ptr->fifo[(ffp              -i) & FIFOMASK] & 0xFF;
-			bite2 = ptr->fifo[(ffp-(CTABLES*2-1)+i) & FIFOMASK] & 0xFF;
-			acc += ctables[i][bite1] + ctables[i][bite2];
-		}
-		*dst = (float)acc; dst += dst_stride;
-		ffp = (ffp + 1) & FIFOMASK;
-	}
-	ptr->fifopos = ffp;
-}
-
-- 
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