[FFmpeg-devel] [PATCH 07/39] avcodec/rl: Allow to create only a few VLC tables
Andreas Rheinhardt
andreas.rheinhardt at gmail.com
Thu Dec 10 13:16:25 EET 2020
It is not uncommon that only the first one is used; this is similar to
ff_init_2d_vlc_rl().
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at gmail.com>
---
libavcodec/rl.c | 3 +++
libavcodec/rl.h | 8 ++++++++
2 files changed, 11 insertions(+)
diff --git a/libavcodec/rl.c b/libavcodec/rl.c
index c532b5bf56..93153ff723 100644
--- a/libavcodec/rl.c
+++ b/libavcodec/rl.c
@@ -80,6 +80,9 @@ av_cold void ff_rl_init_vlc(RLTable *rl, unsigned static_size)
int qmul = q * 2;
int qadd = (q - 1) | 1;
+ if (!rl->rl_vlc[q])
+ return;
+
if (q == 0) {
qmul = 1;
qadd = 0;
diff --git a/libavcodec/rl.h b/libavcodec/rl.h
index a83debccf7..26e0b32a90 100644
--- a/libavcodec/rl.h
+++ b/libavcodec/rl.h
@@ -68,6 +68,14 @@ void ff_rl_init_vlc(RLTable *rl, unsigned static_size);
}\
}
+#define INIT_FIRST_VLC_RL(rl, static_size) \
+do { \
+ static RL_VLC_ELEM rl_vlc_table[static_size]; \
+ \
+ rl.rl_vlc[0] = rl_vlc_table; \
+ ff_rl_init_vlc(&rl, static_size); \
+} while (0)
+
static inline int get_rl_index(const RLTable *rl, int last, int run, int level)
{
int index;
--
2.25.1
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