audioconvert: move peaks functions to separate file

Make a peaks finder helper and use it in the peaks resampler.

spa/plugins/audioconvert/peaks-ops.c

@@ -0,0 +1,91 @@
+/* Spa
+ *
+ * Copyright © 2022 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 <string.h>
+#include <stdio.h>
+#include <math.h>
+#include <errno.h>
+
+#include <spa/support/cpu.h>
+#include <spa/support/log.h>
+#include <spa/utils/defs.h>
+
+#include "peaks-ops.h"
+
+typedef void (*peaks_min_max_func_t) (struct peaks *peaks, const float * SPA_RESTRICT src,
+		uint32_t n_samples, float *min, float *max);
+typedef float (*peaks_abs_max_func_t) (struct peaks *peaks, const float * SPA_RESTRICT src,
+			uint32_t n_samples, float max);
+
+#define MAKE(min_max,abs_max,...) \
+	{ min_max, abs_max, #min_max , __VA_ARGS__ }
+
+static const struct peaks_info {
+	peaks_min_max_func_t min_max;
+	peaks_abs_max_func_t abs_max;
+	const char *name;
+	uint32_t cpu_flags;
+} peaks_table[] =
+{
+#if defined (HAVE_SSE)
+	MAKE(peaks_min_max_sse, peaks_abs_max_sse, SPA_CPU_FLAG_SSE),
+#endif
+	MAKE(peaks_min_max_c, peaks_abs_max_c),
+};
+#undef MAKE
+
+#define MATCH_CPU_FLAGS(a,b)	((a) == 0 || ((a) & (b)) == a)
+
+static const struct peaks_info *find_peaks_info(uint32_t cpu_flags)
+{
+	size_t i;
+	for (i = 0; i < SPA_N_ELEMENTS(peaks_table); i++) {
+		if (!MATCH_CPU_FLAGS(peaks_table[i].cpu_flags, cpu_flags))
+			continue;
+		return &peaks_table[i];
+	}
+	return NULL;
+}
+
+static void impl_peaks_free(struct peaks *peaks)
+{
+	peaks->min_max = NULL;
+	peaks->abs_max = NULL;
+}
+
+int peaks_init(struct peaks *peaks)
+{
+	const struct peaks_info *info;
+
+	info = find_peaks_info(peaks->cpu_flags);
+	if (info == NULL)
+		return -ENOTSUP;
+
+	peaks->cpu_flags = info->cpu_flags;
+	peaks->func_name = info->name;
+	peaks->free = impl_peaks_free;
+	peaks->min_max = info->min_max;
+	peaks->abs_max = info->abs_max;
+	return 0;
+}