Add x86-optimized versions of exponent_min().

Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
(cherry picked from commit dda3f0ef48aa5c3b03566b60b6bf63211e1fe579)

1 files changed, 43 insertions, 0 deletions

diff --git a/libavcodec/ac3dsp.h b/libavcodec/ac3dsp.h
new file mode 100644
index 0000000000..7f13b11f3b
--- /dev/null
+++ b/libavcodec/ac3dsp.h
@@ -0,0 +1,43 @@
+/*
+ * 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
+ */
+
+#ifndef AVCODEC_AC3DSP_H
+#define AVCODEC_AC3DSP_H
+
+#include <stdint.h>
+
+typedef struct AC3DSPContext {
+    /**
+     * Set each encoded exponent in a block to the minimum of itself and the
+     * exponents in the same frequency bin of up to 5 following blocks.
+     * @param exp   pointer to the start of the current block of exponents.
+     *              constraints: align 16
+     * @param num_reuse_blocks  number of blocks that will reuse exponents from the current block.
+     *                          constraints: range 0 to 5
+     * @param nb_coefs  number of frequency coefficients.
+     */
+    void (*ac3_exponent_min)(uint8_t *exp, int num_reuse_blocks, int nb_coefs);
+} AC3DSPContext;
+
+void ff_ac3dsp_init    (AC3DSPContext *c);
+void ff_ac3dsp_init_x86(AC3DSPContext *c);
+
+#endif /* AVCODEC_AC3DSP_H */