hevc: ppc: Add HEVC 4x4 IDCT for PowerPC

Signed-off-by: Diego Biurrun <diego@biurrun.de>

1 files changed, 48 insertions, 0 deletions

diff --git a/libavcodec/ppc/hevcdsp_template.c b/libavcodec/ppc/hevcdsp_template.c
new file mode 100644
index 0000000000..a68ee18dbb
--- /dev/null
+++ b/libavcodec/ppc/hevcdsp_template.c
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) Alexandra Hajkova
+ *
+ * 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
+ */
+
+static void FUNC(ff_hevc_idct_4x4, BIT_DEPTH)(int16_t *coeffs, int col_limit)
+{
+    const int shift = 7;
+    const int shift2 = 20 - BIT_DEPTH;
+    vector int16_t src_01, src_23;
+    vector int32_t res[4];
+    vector int16_t res_packed[2];
+
+    src_01 = vec_ld(0, coeffs);
+    src_23 = vec_ld(16, coeffs);
+
+    transform4x4(src_01, src_23, res, shift, coeffs);
+    src_01 = vec_packs(res[0], res[1]);
+    src_23 = vec_packs(res[2], res[3]);
+    scale(res, res_packed, shift);
+    // transpose
+    src_01 = vec_perm(res_packed[0], res_packed[1], mask[0]);
+    src_23 = vec_perm(res_packed[0], res_packed[1], mask[1]);
+
+    transform4x4(src_01, src_23, res, shift2, coeffs);
+    scale(res, res_packed, shift2);
+    // transpose
+    src_01 = vec_perm(res_packed[0], res_packed[1], mask[0]);
+    src_23 = vec_perm(res_packed[0], res_packed[1], mask[1]);
+
+    vec_st(src_01, 0, coeffs);
+    vec_st(src_23, 16, coeffs);
+}