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avcodec/h261dec: Make decoder init-threadsafe

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Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-11-23 03:34:23 +01:00
parent ed913fcb59
commit 7afc6d71a0
1 changed files with 6 additions and 9 deletions
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15
libavcodec/h261dec.c
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@ -26,6 +26,7 @@
*/
#include "libavutil/avassert.h"
#include "libavutil/thread.h"
#include "avcodec.h"
#include "mpeg_er.h"
#include "mpegutils.h"
@ -47,12 +48,8 @@ static VLC h261_mtype_vlc;
static VLC h261_mv_vlc;
static VLC h261_cbp_vlc;
static av_cold void h261_decode_init_vlc(H261Context *h)
static av_cold void h261_decode_init_static(void)
{
static int done = 0;
if (!done) {
done = 1;
INIT_VLC_STATIC(&h261_mba_vlc, H261_MBA_VLC_BITS, 35,
ff_h261_mba_bits, 1, 1,
ff_h261_mba_code, 1, 1, 662);
@ -66,11 +63,11 @@ static av_cold void h261_decode_init_vlc(H261Context *h)
&ff_h261_cbp_tab[0][1], 2, 1,
&ff_h261_cbp_tab[0][0], 2, 1, 512);
INIT_FIRST_VLC_RL(ff_h261_rl_tcoeff, 552);
}
}
static av_cold int h261_decode_init(AVCodecContext *avctx)
{
static AVOnce init_static_once = AV_ONCE_INIT;
H261Context *h = avctx->priv_data;
MpegEncContext *const s = &h->s;
@ -81,10 +78,10 @@ static av_cold int h261_decode_init(AVCodecContext *avctx)
s->low_delay = 1;
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
h261_decode_init_vlc(h);
h->gob_start_code_skipped = 0;
ff_thread_once(&init_static_once, h261_decode_init_static);
return 0;
}
@ -684,6 +681,6 @@ AVCodec ff_h261_decoder = {
.close = h261_decode_end,
.decode = h261_decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
.max_lowres = 3,
};