opusdsp: create and move deemphasis and postfiltering from opus_celt

1 files changed, 33 insertions, 0 deletions

diff --git a/libavcodec/opusdsp.h b/libavcodec/opusdsp.h
new file mode 100644
index 0000000000..05bf2ba1a4
--- /dev/null
+++ b/libavcodec/opusdsp.h
@@ -0,0 +1,33 @@
+/*
+ * 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
+ */
+
+#ifndef AVCODEC_OPUSDSP_H
+#define AVCODEC_OPUSDSP_H
+
+#include "libavutil/common.h"
+
+#define CELT_EMPH_COEFF 0.8500061035f
+
+typedef struct OpusDSP {
+    void (*postfilter)(float *data, int period, float *gains, int len);
+    float (*deemphasis)(float *out, float *in, float coeff, int len);
+} OpusDSP;
+
+void ff_opus_dsp_init(OpusDSP *ctx);
+
+#endif /* AVCODEC_OPUSDSP_H */