hevc: Add NEON 4x4 and 8x8 IDCT

Optimized by Martin Storsjö <martin@martin.st>.

The speedup vs C code is around 3.2-4.4x.

Signed-off-by: Martin Storsjö <martin@martin.st>

1 files changed, 47 insertions, 0 deletions

diff --git a/libavcodec/arm/hevcdsp_init_arm.c b/libavcodec/arm/hevcdsp_init_arm.c
new file mode 100644
index 0000000000..1e984e6188
--- /dev/null
+++ b/libavcodec/arm/hevcdsp_init_arm.c
@@ -0,0 +1,47 @@
+/*
+ * ARM NEON optimised HEVC IDCT
+ * Copyright (c) 2017 Alexandra Hájková
+ *
+ * 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 "libavutil/attributes.h"
+#include "libavutil/cpu.h"
+#include "libavutil/arm/cpu.h"
+
+#include "libavcodec/hevcdsp.h"
+
+void ff_hevc_idct_4x4_8_neon(int16_t *coeffs, int col_limit);
+void ff_hevc_idct_8x8_8_neon(int16_t *coeffs, int col_limit);
+void ff_hevc_idct_4x4_10_neon(int16_t *coeffs, int col_limit);
+void ff_hevc_idct_8x8_10_neon(int16_t *coeffs, int col_limit);
+
+av_cold void ff_hevc_dsp_init_arm(HEVCDSPContext *c, int bit_depth)
+{
+    int cpu_flags = av_get_cpu_flags();
+
+    if (have_neon(cpu_flags)) {
+        if (bit_depth == 8) {
+            c->idct[0] = ff_hevc_idct_4x4_8_neon;
+            c->idct[1] = ff_hevc_idct_8x8_8_neon;
+        }
+        if (bit_depth == 10) {
+            c->idct[0] = ff_hevc_idct_4x4_10_neon;
+            c->idct[1] = ff_hevc_idct_8x8_10_neon;
+        }
+    }
+}