audioconvert: move some things around

To make it easier to add other implementations later.
Improve selection of resampler function

spa/plugins/audioconvert/resample-peaks-sse.c

@@ -0,0 +1,96 @@
+/* Spa
+ *
+ * Copyright © 2018 Wim Taymans
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <math.h>
+
+#include <xmmintrin.h>
+
+#include "resample-peaks-impl.h"
+
+static inline float hmax_ps(__m128 val)
+{
+	__m128 t = _mm_movehl_ps(val, val);
+	t = _mm_max_ps(t, val);
+	val = _mm_shuffle_ps(val, t, 0x55);
+	val = _mm_max_ss(t, val);
+	return _mm_cvtss_f32(val);
+}
+
+void resample_peaks_process_sse(struct resample *r,
+			const void * SPA_RESTRICT src[], uint32_t *in_len,
+			void * SPA_RESTRICT dst[], uint32_t *out_len)
+{
+	struct peaks_data *pd = r->data;
+	uint32_t c, i, o, end, chunk, unrolled, i_count, o_count;
+	__m128 in, max, mask = _mm_andnot_ps(_mm_set_ps1(-0.0f),
+			_mm_cmpeq_ps(_mm_setzero_ps(), _mm_setzero_ps()));
+
+	if (r->channels == 0)
+		return;
+
+	for (c = 0; c < r->channels; c++) {
+		const float *s = src[c];
+		float *d = dst[c], m = pd->max_f[c];
+
+		o_count = pd->o_count;
+		i_count = pd->i_count;
+		o = i = 0;
+
+		max = _mm_set1_ps(m);
+
+		while (i < *in_len && o < *out_len) {
+			end = ((uint64_t) (o_count + 1) * r->i_rate) / r->o_rate;
+			end = end > i_count ? end - i_count : 0;
+			chunk = SPA_MIN(end, *in_len);
+
+			unrolled = chunk - ((chunk - i) & 3);
+
+			for (; i < unrolled; i+=4) {
+				in = _mm_loadu_ps(&s[i]);
+				in = _mm_and_ps(mask, in);
+				max = _mm_max_ps(in, max);
+			}
+			for (; i < chunk; i++)
+				m = SPA_MAX(fabsf(s[i]), m);
+
+			if (i == end) {
+				d[o++] = SPA_MAX(hmax_ps(max), m);
+				m = 0.0f;
+				max = _mm_set1_ps(m);
+				o_count++;
+			}
+		}
+		pd->max_f[c] = SPA_MAX(hmax_ps(max), m);
+	}
+
+	*out_len = o;
+	*in_len = i;
+	pd->o_count = o_count;
+	pd->i_count = i_count + i;
+
+	while (pd->i_count >= r->i_rate) {
+		pd->i_count -= r->i_rate;
+		pd->o_count -= r->o_rate;
+	}
+}