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authorMans Rullgard <mans@mansr.com>2011-03-19 23:44:00 +0000
committerMans Rullgard <mans@mansr.com>2011-03-20 13:25:19 +0000
commit4538729afed44a0ee0a762d3ef69aa4bbb7f10b3 (patch)
tree746f6f85406a0100bff5684c1055c8922761d020 /libavcodec/sinewin_tablegen.h
parenta45fbda994df54600101e845e29f0af60e456e95 (diff)
downloadffmpeg-4538729afed44a0ee0a762d3ef69aa4bbb7f10b3.tar.gz
Move sine windows to a separate file
These windows do not really belong in fft/mdct files and were easily confused with the similarly named tables used by rdft. Signed-off-by: Mans Rullgard <mans@mansr.com>
Diffstat (limited to 'libavcodec/sinewin_tablegen.h')
-rw-r--r--libavcodec/sinewin_tablegen.h60
1 files changed, 60 insertions, 0 deletions
diff --git a/libavcodec/sinewin_tablegen.h b/libavcodec/sinewin_tablegen.h
new file mode 100644
index 0000000000..91c26c1551
--- /dev/null
+++ b/libavcodec/sinewin_tablegen.h
@@ -0,0 +1,60 @@
+/*
+ * Header file for hardcoded sine windows
+ *
+ * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
+ *
+ * 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 <assert.h>
+// do not use libavutil/libm.h since this is compiled both
+// for the host and the target and config.h is only valid for the target
+#include <math.h>
+#include "libavutil/attributes.h"
+
+#if !CONFIG_HARDCODED_TABLES
+SINETABLE( 32);
+SINETABLE( 64);
+SINETABLE( 128);
+SINETABLE( 256);
+SINETABLE( 512);
+SINETABLE(1024);
+SINETABLE(2048);
+SINETABLE(4096);
+#else
+#include "libavcodec/sinewin_tables.h"
+#endif
+
+SINETABLE_CONST float * const ff_sine_windows[] = {
+ NULL, NULL, NULL, NULL, NULL, // unused
+ ff_sine_32 , ff_sine_64 ,
+ ff_sine_128, ff_sine_256, ff_sine_512, ff_sine_1024, ff_sine_2048, ff_sine_4096
+};
+
+// Generate a sine window.
+av_cold void ff_sine_window_init(float *window, int n) {
+ int i;
+ for(i = 0; i < n; i++)
+ window[i] = sinf((i + 0.5) * (M_PI / (2.0 * n)));
+}
+
+av_cold void ff_init_ff_sine_windows(int index) {
+ assert(index >= 0 && index < FF_ARRAY_ELEMS(ff_sine_windows));
+#if !CONFIG_HARDCODED_TABLES
+ ff_sine_window_init(ff_sine_windows[index], 1 << index);
+#endif
+}