lavc/ac3: add R-V Zbb extract_exponents

1 files changed, 38 insertions, 0 deletions

diff --git a/libavcodec/riscv/ac3dsp_init.c b/libavcodec/riscv/ac3dsp_init.c
new file mode 100644
index 0000000000..20f294f1de
--- /dev/null
+++ b/libavcodec/riscv/ac3dsp_init.c
@@ -0,0 +1,38 @@
+/*
+ * Copyright © 2023 Rémi Denis-Courmont.
+ *
+ * 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 <stdint.h>
+
+#include "config.h"
+#include "libavutil/attributes.h"
+#include "libavutil/cpu.h"
+#include "libavcodec/ac3dsp.h"
+
+void ff_extract_exponents_rvb(uint8_t *exp, int32_t *coef, int nb_coefs);
+
+av_cold void ff_ac3dsp_init_riscv(AC3DSPContext *c)
+{
+    int flags = av_get_cpu_flags();
+
+    if (flags & AV_CPU_FLAG_RVB_ADDR) {
+        if (flags & AV_CPU_FLAG_RVB_BASIC)
+            c->extract_exponents = ff_extract_exponents_rvb;
+    }
+}