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avcodec/atrac: Make generating tables thread-safe
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
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@ -30,6 +30,8 @@
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#include <stdio.h>
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#include <string.h>
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#include "libavutil/thread.h"
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#include "avcodec.h"
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#include "atrac.h"
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@ -45,22 +47,23 @@ static const float qmf_48tap_half[24] = {
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-0.043596379, -0.099384367, 0.13207909, 0.46424159
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};
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av_cold void ff_atrac_generate_tables(void)
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static av_cold void atrac_generate_tables(void)
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{
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int i;
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float s;
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/* Generate scale factors */
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if (!ff_atrac_sf_table[63])
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for (i=0 ; i<64 ; i++)
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ff_atrac_sf_table[i] = pow(2.0, (i - 15) / 3.0);
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for (int i = 0; i < 64; i++)
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ff_atrac_sf_table[i] = pow(2.0, (i - 15) / 3.0);
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/* Generate the QMF window. */
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if (!qmf_window[47])
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for (i=0 ; i<24; i++) {
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s = qmf_48tap_half[i] * 2.0;
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qmf_window[i] = qmf_window[47 - i] = s;
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}
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for (int i = 0; i < 24; i++) {
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float s = qmf_48tap_half[i] * 2.0;
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qmf_window[i] = qmf_window[47 - i] = s;
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}
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}
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av_cold void ff_atrac_generate_tables(void)
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{
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static AVOnce init_static_once = AV_ONCE_INIT;
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ff_thread_once(&init_static_once, atrac_generate_tables);
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}
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av_cold void ff_atrac_init_gain_compensation(AtracGCContext *gctx, int id2exp_offset,
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