opus: Factor out imdct15 into a standalone component

It will be reused by the AAC decoder.

1 files changed, 46 insertions, 0 deletions

diff --git a/libavcodec/aarch64/imdct15_init.c b/libavcodec/aarch64/imdct15_init.c
new file mode 100644
index 0000000000..38018f2b4a
--- /dev/null
+++ b/libavcodec/aarch64/imdct15_init.c
@@ -0,0 +1,46 @@
+/*
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stddef.h>
+
+#include "libavutil/cpu.h"
+#include "libavutil/aarch64/cpu.h"
+#include "libavutil/internal.h"
+
+#include "libavcodec/imdct15.h"
+
+#include "asm-offsets.h"
+
+AV_CHECK_OFFSET(IMDCT15Context, exptab,         CELT_EXPTAB);
+AV_CHECK_OFFSET(IMDCT15Context, fft_n,          CELT_FFT_N);
+AV_CHECK_OFFSET(IMDCT15Context, len2,           CELT_LEN2);
+AV_CHECK_OFFSET(IMDCT15Context, len4,           CELT_LEN4);
+AV_CHECK_OFFSET(IMDCT15Context, tmp,            CELT_TMP);
+AV_CHECK_OFFSET(IMDCT15Context, twiddle_exptab, CELT_TWIDDLE);
+
+void ff_celt_imdct_half_neon(IMDCT15Context *s, float *dst, const float *src,
+                             ptrdiff_t stride, float scale);
+
+void ff_imdct15_init_aarch64(IMDCT15Context *s)
+{
+    int cpu_flags = av_get_cpu_flags();
+
+    if (have_neon(cpu_flags)) {
+        s->imdct_half = ff_celt_imdct_half_neon;
+    }
+}