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avcodec/dvdec: Make decoder init-threadsafe

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Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-12-29 19:31:37 +01:00 committed by Andreas Rheinhardt
parent 6d484671ec
commit bc5e68ea88
1 changed files with 4 additions and 7 deletions
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11
libavcodec/dvdec.c
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@ -40,6 +40,7 @@
#include "libavutil/internal.h"
#include "libavutil/mem_internal.h"
#include "libavutil/pixdesc.h"
#include "libavutil/thread.h"
#include "avcodec.h"
#include "dv.h"
@ -142,12 +143,6 @@ static void dv_init_static(void)
uint8_t new_dv_vlc_run[NB_DV_VLC * 2];
int16_t new_dv_vlc_level[NB_DV_VLC * 2];
int i, j;
static int done = 0;
if (done)
return;
done = 1;
/* it's faster to include sign bit in a generic VLC parsing scheme */
for (i = 0, j = 0; i < NB_DV_VLC; i++, j++) {
@ -240,6 +235,7 @@ static void dv_init_weight_tables(DVVideoContext *ctx, const AVDVProfile *d)
static av_cold int dvvideo_decode_init(AVCodecContext *avctx)
{
static AVOnce init_static_once = AV_ONCE_INIT;
DVVideoContext *s = avctx->priv_data;
int i;
@ -259,7 +255,7 @@ static av_cold int dvvideo_decode_init(AVCodecContext *avctx)
s->idct_put[0] = s->idsp.idct_put;
s->idct_put[1] = ff_simple_idct248_put;
dv_init_static();
ff_thread_once(&init_static_once, dv_init_static);
return ff_dvvideo_init(avctx);
}
@ -695,4 +691,5 @@ const AVCodec ff_dvvideo_decoder = {
.decode = dvvideo_decode_frame,
.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_SLICE_THREADS,
.max_lowres = 3,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};