diff options
Diffstat (limited to 'plugins/dumb/dumb-kode54/src/helpers/resamp2.inc')
| -rw-r--r-- | plugins/dumb/dumb-kode54/src/helpers/resamp2.inc | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/plugins/dumb/dumb-kode54/src/helpers/resamp2.inc b/plugins/dumb/dumb-kode54/src/helpers/resamp2.inc new file mode 100644 index 00000000..ecdc400c --- /dev/null +++ b/plugins/dumb/dumb-kode54/src/helpers/resamp2.inc @@ -0,0 +1,160 @@ +/* _______ ____ __ ___ ___
+ * \ _ \ \ / \ / \ \ / / ' ' '
+ * | | \ \ | | || | \/ | . .
+ * | | | | | | || ||\ /| |
+ * | | | | | | || || \/ | | ' ' '
+ * | | | | | | || || | | . .
+ * | |_/ / \ \__// || | |
+ * /_______/ynamic \____/niversal /__\ /____\usic /| . . ibliotheque
+ * / \
+ * / . \
+ * resamp2.inc - Resampling helper template. / / \ \
+ * | < / \_
+ * By Bob and entheh. | \/ /\ /
+ * \_ / > /
+ * In order to find a good trade-off between | \ / /
+ * speed and accuracy in this code, some tests | ' /
+ * were carried out regarding the behaviour of \__/
+ * long long ints with gcc. The following code
+ * was tested:
+ *
+ * int a, b, c;
+ * c = ((long long)a * b) >> 16;
+ *
+ * DJGPP GCC Version 3.0.3 generated the following assembly language code for
+ * the multiplication and scaling, leaving the 32-bit result in EAX.
+ *
+ * movl -8(%ebp), %eax ; read one int into EAX
+ * imull -4(%ebp) ; multiply by the other; result goes in EDX:EAX
+ * shrdl $16, %edx, %eax ; shift EAX right 16, shifting bits in from EDX
+ *
+ * Note that a 32*32->64 multiplication is performed, allowing for high
+ * accuracy. On the Pentium 2 and above, shrdl takes two cycles (generally),
+ * so it is a minor concern when four multiplications are being performed
+ * (the cubic resampler). On the Pentium MMX and earlier, it takes four or
+ * more cycles, so this method is unsuitable for use in the low-quality
+ * resamplers.
+ *
+ * Since "long long" is a gcc-specific extension, we use LONG_LONG instead,
+ * defined in dumb.h. We may investigate later what code MSVC generates, but
+ * if it seems too slow then we suggest you use a good compiler.
+ *
+ * FIXME: these comments are somewhat out of date now.
+ */
+
+
+
+#define SUFFIX3 _1
+
+/* For convenience, returns nonzero on stop. */
+static int process_pickup(DUMB_RESAMPLER *resampler)
+{
+ if (resampler->overshot < 0) {
+ resampler->overshot = 0;
+ dumb_resample(resampler, NULL, 2, MONO_DEST_VOLUME_ZEROS, 1.0f); /* Doesn't matter which SUFFIX3. */
+ COPYSRC(resampler->X, 0, resampler->X, 1);
+ }
+
+ for (;;) {
+ SRCTYPE *src = resampler->src;
+
+ if (resampler->dir < 0) {
+ if (resampler->overshot >= 3 && resampler->pos+3 >= resampler->start) COPYSRC(resampler->X, 0, src, resampler->pos+3);
+ if (resampler->overshot >= 2 && resampler->pos+2 >= resampler->start) COPYSRC(resampler->X, 1, src, resampler->pos+2);
+ if (resampler->overshot >= 1 && resampler->pos+1 >= resampler->start) COPYSRC(resampler->X, 2, src, resampler->pos+1);
+ resampler->overshot = resampler->start - resampler->pos - 1;
+ } else {
+ if (resampler->overshot >= 3 && resampler->pos-3 < resampler->end) COPYSRC(resampler->X, 0, src, resampler->pos-3);
+ if (resampler->overshot >= 2 && resampler->pos-2 < resampler->end) COPYSRC(resampler->X, 1, src, resampler->pos-2);
+ if (resampler->overshot >= 1 && resampler->pos-1 < resampler->end) COPYSRC(resampler->X, 2, src, resampler->pos-1);
+ resampler->overshot = resampler->pos - resampler->end;
+ }
+
+ if (resampler->overshot < 0) {
+ resampler->overshot = 0;
+ return 0;
+ }
+
+ if (!resampler->pickup) {
+ resampler->dir = 0;
+ return 1;
+ }
+ (*resampler->pickup)(resampler, resampler->pickup_data);
+ if (resampler->dir == 0) return 1;
+ ASSERT(resampler->dir == -1 || resampler->dir == 1);
+ }
+}
+
+
+
+/* Create mono destination resampler. */
+/* SUFFIX3 was set above. */
+#define VOLUME_PARAMETERS MONO_DEST_VOLUME_PARAMETERS
+#define VOLUME_VARIABLES MONO_DEST_VOLUME_VARIABLES
+#define SET_VOLUME_VARIABLES SET_MONO_DEST_VOLUME_VARIABLES
+#define RETURN_VOLUME_VARIABLES RETURN_MONO_DEST_VOLUME_VARIABLES
+#define VOLUMES_ARE_ZERO MONO_DEST_VOLUMES_ARE_ZERO
+#define MIX_ALIAS(op, upd, offset) MONO_DEST_MIX_ALIAS(op, upd, offset)
+#define MIX_LINEAR(op, upd, o0, o1) MONO_DEST_MIX_LINEAR(op, upd, o0, o1)
+#define MIX_CUBIC(op, upd, x0, x3, o0, o1, o2, o3) MONO_DEST_MIX_CUBIC(op, upd, x0, x3, o0, o1, o2, o3)
+#define MIX_ZEROS(op) *dst++ op 0
+#include "resamp3.inc"
+
+/* Create stereo destination resampler. */
+#define SUFFIX3 _2
+#define VOLUME_PARAMETERS DUMB_VOLUME_RAMP_INFO * volume_left, DUMB_VOLUME_RAMP_INFO * volume_right
+#define VOLUME_VARIABLES lvol=0, lvolr=0, lvold=0, lvolt=0, lvolm=0, rvol=0, rvolr=0, rvold=0, rvolt=0, rvolm=0
+#define SET_VOLUME_VARIABLES { \
+ if ( volume_left ) { \
+ lvolr = (int)(volume_left->volume * 16777216.0); \
+ lvold = (int)(volume_left->delta * 16777216.0); \
+ lvolt = (int)(volume_left->target * 16777216.0); \
+ lvolm = (int)(volume_left->mix * 16777216.0); \
+ lvol = MULSCV( lvolr, lvolm ); \
+ if ( lvolr == lvolt ) volume_left = NULL; \
+ } else { \
+ lvol = 0; \
+ lvolt = 0; \
+ } \
+ if ( volume_right ) { \
+ rvolr = (int)(volume_right->volume * 16777216.0); \
+ rvold = (int)(volume_right->delta * 16777216.0); \
+ rvolt = (int)(volume_right->target * 16777216.0); \
+ rvolm = (int)(volume_right->mix * 16777216.0); \
+ rvol = MULSCV( rvolr, rvolm ); \
+ if ( rvolr == rvolt ) volume_right = NULL; \
+ } else { \
+ rvol = 0; \
+ rvolt = 0; \
+ } \
+}
+#define RETURN_VOLUME_VARIABLES { \
+ if ( volume_left ) volume_left->volume = (float)lvolr / 16777216.0f; \
+ if ( volume_right ) volume_right->volume = (float)rvolr / 16777216.0f; \
+}
+#define VOLUMES_ARE_ZERO (lvol == 0 && lvolt == 0 && rvol == 0 && rvolt == 0)
+#define MIX_ALIAS(op, upd, offset) STEREO_DEST_MIX_ALIAS(op, upd, offset)
+#define MIX_LINEAR(op, upd, o0, o1) STEREO_DEST_MIX_LINEAR(op, upd, o0, o1)
+#define MIX_CUBIC(op, upd, x0, x3, o0, o1, o2, o3) STEREO_DEST_MIX_CUBIC(op, upd, x0, x3, o0, o1, o2, o3)
+#define MIX_ZEROS(op) { *dst++ op 0; *dst++ op 0; }
+#include "resamp3.inc"
+
+
+
+#undef STEREO_DEST_MIX_CUBIC
+#undef MONO_DEST_MIX_CUBIC
+#undef STEREO_DEST_MIX_LINEAR
+#undef MONO_DEST_MIX_LINEAR
+#undef STEREO_DEST_MIX_ALIAS
+#undef MONO_DEST_MIX_ALIAS
+#undef MONO_DEST_VOLUMES_ARE_ZERO
+#undef SET_MONO_DEST_VOLUME_VARIABLES
+#undef RETURN_MONO_DEST_VOLUME_VARIABLES
+#undef MONO_DEST_VOLUME_ZEROS
+#undef MONO_DEST_VOLUME_VARIABLES
+#undef MONO_DEST_VOLUME_PARAMETERS
+#undef COPYSRC2
+#undef COPYSRC
+#undef DIVIDE_BY_SRC_CHANNELS
+#undef SRC_CHANNELS
+#undef SUFFIX2
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