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Code Issues Releases Activity

avcodec/rv10: Make VLC tables smaller

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These tables were huge (14 bits) because one needed 14 bits in order to
find out whether a code is valid and in the VLC table or a valid code that
required hacky workarounds due to RealVideo 1.0 using multiple codes
for the same symbol and the code predating the introduction of symbols
tables for VLCs.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-10-28 10:48:09 +01:00
parent daf8b10eeb
commit 1320d336ef
1 changed files with 5 additions and 5 deletions
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10
libavcodec/rv10.c
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@ -47,7 +47,7 @@
#define RV_GET_MICRO_VER(x) (((x) >> 12) & 0xFF)
#define MAX_VLC_ENTRIES 1023 // Note: Does not include the skip entries.
#define DC_VLC_BITS 14 // FIXME find a better solution
#define DC_VLC_BITS 9
typedef struct RVDecContext {
MpegEncContext m;
@ -346,14 +346,14 @@ static av_cold void rv10_build_vlc(VLC *vlc, const uint16_t len_count[15],
static av_cold void rv10_init_static(void)
{
static VLC_TYPE table[16896 + 16640][2];
static VLC_TYPE table[1472 + 992][2];
rv_dc_lum.table = table;
rv_dc_lum.table_allocated = 16896;
rv_dc_lum.table_allocated = 1472;
rv10_build_vlc(&rv_dc_lum, rv_lum_len_count,
rv_sym_run_len, FF_ARRAY_ELEMS(rv_sym_run_len));
rv_dc_chrom.table = &table[16896];
rv_dc_chrom.table_allocated = 16640;
rv_dc_chrom.table = &table[1472];
rv_dc_chrom.table_allocated = 992;
rv10_build_vlc(&rv_dc_chrom, rv_chrom_len_count,
rv_sym_run_len, FF_ARRAY_ELEMS(rv_sym_run_len) - 2);
ff_h263_decode_init_vlc();