1 files changed, 72 insertions, 0 deletions
diff --git a/spa/plugins/audioconvert/delay.h b/spa/plugins/audioconvert/delay.h
new file mode 100644
index 0000000..16e189f
--- /dev/null
+++ b/spa/plugins/audioconvert/delay.h
@@ -0,0 +1,72 @@
+/* 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.
+ */
+
+#ifndef DELAY_H
+#define DELAY_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+static inline void delay_run(float *buffer, uint32_t *pos,
+		uint32_t n_buffer, uint32_t delay,
+		float *dst, const float *src, const float vol, uint32_t n_samples)
+{
+	uint32_t i;
+	uint32_t p = *pos;
+
+	for (i = 0; i < n_samples; i++) {
+		buffer[p] = src[i];
+		dst[i] = buffer[(p - delay) & (n_buffer-1)] * vol;
+		p = (p + 1) & (n_buffer-1);
+	}
+	*pos = p;
+}
+
+static inline void delay_convolve_run(float *buffer, uint32_t *pos,
+		uint32_t n_buffer, uint32_t delay,
+		const float *taps, uint32_t n_taps,
+		float *dst, const float *src, const float vol, uint32_t n_samples)
+{
+	uint32_t i, j;
+	uint32_t p = *pos;
+
+	for (i = 0; i < n_samples; i++) {
+		float sum = 0.0f;
+
+		buffer[p] = src[i];
+		for (j = 0; j < n_taps; j++)
+			sum += (taps[j] * buffer[((p - delay) - j) & (n_buffer-1)]);
+		dst[i] = sum * vol;
+
+		p = (p + 1) & (n_buffer-1);
+	}
+	*pos = p;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* DELAY_H */