lavc/opus*: move to opus/ subdir

1 files changed, 68 insertions, 0 deletions

diff --git a/libavcodec/opus/dsp.c b/libavcodec/opus/dsp.c
new file mode 100644
index 0000000000..6cd76ceceb
--- /dev/null
+++ b/libavcodec/opus/dsp.c
@@ -0,0 +1,68 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "config.h"
+#include "libavutil/attributes.h"
+#include "libavutil/mem_internal.h"
+#include "dsp.h"
+
+static void postfilter_c(float *data, int period, float *gains, int len)
+{
+    const float g0 = gains[0];
+    const float g1 = gains[1];
+    const float g2 = gains[2];
+
+    float x4 = data[-period - 2];
+    float x3 = data[-period - 1];
+    float x2 = data[-period + 0];
+    float x1 = data[-period + 1];
+
+    for (int i = 0; i < len; i++) {
+        float x0 = data[i - period + 2];
+        data[i] += g0 * x2        +
+                   g1 * (x1 + x3) +
+                   g2 * (x0 + x4);
+        x4 = x3;
+        x3 = x2;
+        x2 = x1;
+        x1 = x0;
+    }
+}
+
+static float deemphasis_c(float *y, float *x, float coeff, const float *weights, int len)
+{
+    const float c = weights[0];
+    for (int i = 0; i < len; i++)
+        coeff = y[i] = x[i] + coeff*c;
+
+    return coeff;
+}
+
+av_cold void ff_opus_dsp_init(OpusDSP *ctx)
+{
+    ctx->postfilter = postfilter_c;
+    ctx->deemphasis = deemphasis_c;
+
+#if ARCH_AARCH64
+    ff_opus_dsp_init_aarch64(ctx);
+#elif ARCH_RISCV
+    ff_opus_dsp_init_riscv(ctx);
+#elif ARCH_X86
+    ff_opus_dsp_init_x86(ctx);
+#endif
+}