[FFmpeg-cvslog] avcodec/asvdec: Reduce the size of some VLCs
Andreas Rheinhardt
git at videolan.org
Fri Oct 16 01:59:28 EEST 2020
ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at gmail.com> | Mon Oct 12 10:48:29 2020 +0200| [2a8edb1ad3d91761a1557687c330d11967d18a34] | committer: Andreas Rheinhardt
avcodec/asvdec: Reduce the size of some VLCs
Reviewed-by: Michael Niedermayer <michael at niedermayer.cc>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at gmail.com>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=2a8edb1ad3d91761a1557687c330d11967d18a34
---
libavcodec/asvdec.c | 27 +++++++++++++++------------
1 file changed, 15 insertions(+), 12 deletions(-)
diff --git a/libavcodec/asvdec.c b/libavcodec/asvdec.c
index 9a11446f52..a21e4277b3 100644
--- a/libavcodec/asvdec.c
+++ b/libavcodec/asvdec.c
@@ -34,7 +34,10 @@
#include "mathops.h"
#include "mpeg12data.h"
-#define VLC_BITS 6
+#define CCP_VLC_BITS 5
+#define DC_CCP_VLC_BITS 4
+#define AC_CCP_VLC_BITS 6
+#define ASV1_LEVEL_VLC_BITS 4
#define ASV2_LEVEL_VLC_BITS 10
static VLC ccp_vlc;
@@ -50,18 +53,18 @@ static av_cold void init_vlcs(ASV1Context *a)
if (!done) {
done = 1;
- INIT_VLC_STATIC(&ccp_vlc, VLC_BITS, 17,
+ INIT_VLC_STATIC(&ccp_vlc, CCP_VLC_BITS, 17,
&ff_asv_ccp_tab[0][1], 2, 1,
- &ff_asv_ccp_tab[0][0], 2, 1, 64);
- INIT_VLC_STATIC(&dc_ccp_vlc, VLC_BITS, 8,
+ &ff_asv_ccp_tab[0][0], 2, 1, 32);
+ INIT_VLC_STATIC(&dc_ccp_vlc, DC_CCP_VLC_BITS, 8,
&ff_asv_dc_ccp_tab[0][1], 2, 1,
- &ff_asv_dc_ccp_tab[0][0], 2, 1, 64);
- INIT_VLC_STATIC(&ac_ccp_vlc, VLC_BITS, 16,
+ &ff_asv_dc_ccp_tab[0][0], 2, 1, 16);
+ INIT_VLC_STATIC(&ac_ccp_vlc, AC_CCP_VLC_BITS, 16,
&ff_asv_ac_ccp_tab[0][1], 2, 1,
&ff_asv_ac_ccp_tab[0][0], 2, 1, 64);
- INIT_VLC_STATIC(&level_vlc, VLC_BITS, 7,
+ INIT_VLC_STATIC(&level_vlc, ASV1_LEVEL_VLC_BITS, 7,
&ff_asv_level_tab[0][1], 2, 1,
- &ff_asv_level_tab[0][0], 2, 1, 64);
+ &ff_asv_level_tab[0][0], 2, 1, 16);
INIT_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
&ff_asv2_level_tab[0][1], 2, 1,
&ff_asv2_level_tab[0][0], 2, 1, 1024);
@@ -76,7 +79,7 @@ static inline int asv2_get_bits(GetBitContext *gb, int n)
static inline int asv1_get_level(GetBitContext *gb)
{
- int code = get_vlc2(gb, level_vlc.table, VLC_BITS, 1);
+ int code = get_vlc2(gb, level_vlc.table, ASV1_LEVEL_VLC_BITS, 1);
if (code == 3)
return get_sbits(gb, 8);
@@ -101,7 +104,7 @@ static inline int asv1_decode_block(ASV1Context *a, int16_t block[64])
block[0] = 8 * get_bits(&a->gb, 8);
for (i = 0; i < 11; i++) {
- const int ccp = get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1);
+ const int ccp = get_vlc2(&a->gb, ccp_vlc.table, CCP_VLC_BITS, 1);
if (ccp) {
if (ccp == 16)
@@ -133,7 +136,7 @@ static inline int asv2_decode_block(ASV1Context *a, int16_t block[64])
block[0] = 8 * asv2_get_bits(&a->gb, 8);
- ccp = get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1);
+ ccp = get_vlc2(&a->gb, dc_ccp_vlc.table, DC_CCP_VLC_BITS, 1);
if (ccp) {
if (ccp & 4)
block[a->scantable.permutated[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4;
@@ -144,7 +147,7 @@ static inline int asv2_decode_block(ASV1Context *a, int16_t block[64])
}
for (i = 1; i < count + 1; i++) {
- const int ccp = get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1);
+ const int ccp = get_vlc2(&a->gb, ac_ccp_vlc.table, AC_CCP_VLC_BITS, 1);
if (ccp) {
if (ccp & 8)
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