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Code Issues Releases Activity

avcodec/msmpeg4: Factor out common RLTable initialization code

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Up until now, both the msmpeg4 decoders and encoders initialized several
RLTables common to them (the decoders also initialized the VLCs of these
RLTables). This is an obstacle to making these codecs init-threadsafe.
So move this initialization to ff_msmpeg4_common_init() that already
contains this initialization code. This allows to reuse the AVOnce used
for initializing ff_v2_dc_lum/chroma_table which automatically makes
initializing these RLTables thread-safe.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-12-10 06:39:41 +01:00 committed by Andreas Rheinhardt
parent 0d30c04e5d
commit 1d5d666601
5 changed files with 12 additions and 10 deletions
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12
libavcodec/msmpeg4.c
View File

@ -103,6 +103,16 @@ static av_cold void init_h263_dc_for_msmpeg4(void)
}
}
static av_cold void msmpeg4_common_init_static(void)
{
static uint8_t rl_table_store[NB_RL_TABLES][2][2 * MAX_RUN + MAX_LEVEL + 3];
for (int i = 0; i < NB_RL_TABLES; i++)
ff_rl_init(&ff_rl_table[i], rl_table_store[i]);
init_h263_dc_for_msmpeg4();
}
av_cold void ff_msmpeg4_common_init(MpegEncContext *s)
{
static AVOnce init_static_once = AV_ONCE_INIT;
@ -145,7 +155,7 @@ av_cold void ff_msmpeg4_common_init(MpegEncContext *s)
}
//Note the default tables are set in common_init in mpegvideo.c
ff_thread_once(&init_static_once, init_h263_dc_for_msmpeg4);
ff_thread_once(&init_static_once, msmpeg4_common_init_static);
}
/* predict coded block */

1
libavcodec/msmpeg4data.c
View File

@ -33,7 +33,6 @@
uint32_t ff_v2_dc_lum_table[512][2];
uint32_t ff_v2_dc_chroma_table[512][2];
uint8_t ff_static_rl_table_store[NB_RL_TABLES][2][2 * MAX_RUN + MAX_LEVEL + 3];
VLC ff_msmp4_mb_i_vlc;
VLC ff_msmp4_dc_luma_vlc[2];

1
libavcodec/msmpeg4data.h
View File

@ -59,7 +59,6 @@ extern const uint8_t ff_wmv1_scantable[WMV1_SCANTABLE_COUNT][64];
#define NB_RL_TABLES 6
extern RLTable ff_rl_table[NB_RL_TABLES];
extern uint8_t ff_static_rl_table_store[NB_RL_TABLES][2][2 * MAX_RUN + MAX_LEVEL + 3];
extern uint32_t ff_v2_dc_lum_table[512][2];
extern uint32_t ff_v2_dc_chroma_table[512][2];

5
libavcodec/msmpeg4dec.c
View File

@ -295,7 +295,7 @@ av_cold int ff_msmpeg4_decode_init(AVCodecContext *avctx)
{
MpegEncContext *s = avctx->priv_data;
static volatile int done = 0;
int i, ret;
int ret;
MVTable *mv;
if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
@ -307,9 +307,6 @@ av_cold int ff_msmpeg4_decode_init(AVCodecContext *avctx)
ff_msmpeg4_common_init(s);
if (!done) {
for(i=0;i<NB_RL_TABLES;i++) {
ff_rl_init(&ff_rl_table[i], ff_static_rl_table_store[i]);
}
INIT_FIRST_VLC_RL(ff_rl_table[0], 642);
INIT_FIRST_VLC_RL(ff_rl_table[1], 1104);
INIT_FIRST_VLC_RL(ff_rl_table[2], 554);

3
libavcodec/msmpeg4enc.c
View File

@ -131,9 +131,6 @@ av_cold void ff_msmpeg4_encode_init(MpegEncContext *s)
init_mv_table(&ff_mv_tables[0], mv_index_tables[0]);
init_mv_table(&ff_mv_tables[1], mv_index_tables[1]);
for(i=0;i<NB_RL_TABLES;i++)
ff_rl_init(&ff_rl_table[i], ff_static_rl_table_store[i]);
for(i=0; i<NB_RL_TABLES; i++){
int level;
for (level = 1; level <= MAX_LEVEL; level++) {