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authorJustin Ruggles <justin.ruggles@gmail.com>2011-02-10 12:20:36 -0500
committerRonald S. Bultje <rsbultje@gmail.com>2011-02-10 15:32:47 -0500
commitdda3f0ef48aa5c3b03566b60b6bf63211e1fe579 (patch)
tree0adb6558e2581beb7019d89998dd8d7ba210be65 /libavcodec/ac3dsp.c
parentb4668274b944abae61759e796c5cc36ade510f24 (diff)
downloadffmpeg-dda3f0ef48aa5c3b03566b60b6bf63211e1fe579.tar.gz
Add x86-optimized versions of exponent_min().
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Diffstat (limited to 'libavcodec/ac3dsp.c')
-rw-r--r--libavcodec/ac3dsp.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/libavcodec/ac3dsp.c b/libavcodec/ac3dsp.c
new file mode 100644
index 0000000000..f688e6a72b
--- /dev/null
+++ b/libavcodec/ac3dsp.c
@@ -0,0 +1,51 @@
+/*
+ * AC-3 DSP utils
+ * Copyright (c) 2011 Justin Ruggles
+ *
+ * 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 "avcodec.h"
+#include "ac3dsp.h"
+
+static void ac3_exponent_min_c(uint8_t *exp, int num_reuse_blocks, int nb_coefs)
+{
+ int blk, i;
+
+ if (!num_reuse_blocks)
+ return;
+
+ for (i = 0; i < nb_coefs; i++) {
+ uint8_t min_exp = *exp;
+ uint8_t *exp1 = exp + 256;
+ for (blk = 0; blk < num_reuse_blocks; blk++) {
+ uint8_t next_exp = *exp1;
+ if (next_exp < min_exp)
+ min_exp = next_exp;
+ exp1 += 256;
+ }
+ *exp++ = min_exp;
+ }
+}
+
+av_cold void ff_ac3dsp_init(AC3DSPContext *c)
+{
+ c->ac3_exponent_min = ac3_exponent_min_c;
+
+ if (HAVE_MMX)
+ ff_ac3dsp_init_x86(c);
+}