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avcodec/vc1: Make ff_vc1_init_common() thread-safe

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Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-11-16 15:09:01 +01:00
parent 58fc810d42
commit def1b6be6b
1 changed files with 18 additions and 14 deletions
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32
libavcodec/vc1.c
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@ -27,6 +27,7 @@
*/
#include "libavutil/attributes.h"
#include "libavutil/thread.h"
#include "internal.h"
#include "avcodec.h"
#include "mpegvideo.h"
@ -1576,21 +1577,11 @@ static const uint16_t vlc_offs[] = {
31714, 31746, 31778, 32306, 32340, 32372
};
/**
* Init VC-1 specific tables and VC1Context members
* @param v The VC1Context to initialize
* @return Status
*/
av_cold int ff_vc1_init_common(VC1Context *v)
static av_cold void vc1_init_static(void)
{
static int done = 0;
int i = 0;
static VLC_TYPE vlc_table[32372][2];
v->hrd_rate = v->hrd_buffer = NULL;
/* VLC tables */
if (!done) {
INIT_VLC_STATIC(&ff_vc1_bfraction_vlc, VC1_BFRACTION_VLC_BITS, 23,
ff_vc1_bfraction_bits, 1, 1,
ff_vc1_bfraction_codes, 1, 1, 1 << VC1_BFRACTION_VLC_BITS);
@ -1697,14 +1688,27 @@ av_cold int ff_vc1_init_common(VC1Context *v)
ff_vc1_if_1mv_mbmode_bits[i], 1, 1,
ff_vc1_if_1mv_mbmode_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
}
done = 1;
}
}
/* Other defaults */
/**
* Init VC-1 specific tables and VC1Context members
* @param v The VC1Context to initialize
* @return Status
*/
av_cold int ff_vc1_init_common(VC1Context *v)
{
static AVOnce init_static_once = AV_ONCE_INIT;
v->hrd_rate = v->hrd_buffer = NULL;
/* defaults */
v->pq = -1;
v->mvrange = 0; /* 7.1.1.18, p80 */
ff_vc1dsp_init(&v->vc1dsp);
/* VLC tables */
ff_thread_once(&init_static_once, vc1_init_static);
return 0;
}