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Code Issues Releases Activity

avcodec/dcahuff, dca_core, dca_lbr: Apply offset during VLC creation

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Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2022-09-06 04:04:59 +02:00
parent 97610e856a
commit 597bfff342
4 changed files with 24 additions and 28 deletions
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2
libavcodec/dca_core.c
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@@ -69,7 +69,7 @@ static const uint8_t block_code_nbits[7] = {
static int dca_get_vlc(GetBitContext *s, DCAVLC *v, int i)
{
return get_vlc2(s, v->vlc[i].table, v->vlc[i].bits, v->max_depth) + v->offset;
return get_vlc2(s, v->vlc[i].table, v->vlc[i].bits, v->max_depth);
}
static void get_array(GetBitContext *s, int32_t *array, int size, int n)

4
libavcodec/dca_lbr.c
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@@ -263,8 +263,8 @@ static int parse_lfe_chunk(DCALbrDecoder *s, LBRChunk *chunk)
static inline int parse_vlc(GetBitContext *s, VLC *vlc, int max_depth)
{
int v = get_vlc2(s, vlc->table, vlc->bits, max_depth);
if (v > 0)
return v - 1;
if (v >= 0)
return v;
// Rare value
return get_bits(s, get_bits(s, 3) + 1);
}

45
libavcodec/dcahuff.c
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@@ -793,44 +793,41 @@ av_cold void ff_dca_init_vlcs(void)
unsigned offset = 0;
int i;
#define DCA_INIT_VLC(vlc, nb_bits, nb_codes) \
#define DCA_INIT_VLC(vlc, nb_bits, nb_codes, entry_offset) \
do { \
vlc.table = &dca_table[offset]; \
vlc.table_allocated = FF_ARRAY_ELEMS(dca_table) - offset; \
ff_init_vlc_from_lengths(&vlc, nb_bits, nb_codes, &src_table[0][1], 2, \
&src_table[0][0], 2, 1, \
0, INIT_VLC_STATIC_OVERLONG, NULL); \
&src_table[0][0], 2, 1, entry_offset, \
INIT_VLC_STATIC_OVERLONG, NULL); \
offset += vlc.table_size; \
src_table += nb_codes; \
} while (0)
for (unsigned i = 0; i < DCA_CODE_BOOKS; i++) {
ff_dca_vlc_quant_index[i].offset = ff_dca_bitalloc_offsets[i];
ff_dca_vlc_quant_index[i].max_depth = 1 + (i > 4);
for (unsigned j = 0; j < ff_dca_quant_index_group_size[i]; j++)
DCA_INIT_VLC(ff_dca_vlc_quant_index[i].vlc[j], bitalloc_maxbits[i][j],
ff_dca_bitalloc_sizes[i]);
ff_dca_bitalloc_sizes[i], ff_dca_bitalloc_offsets[i]);
}
ff_dca_vlc_bit_allocation.offset = 1;
ff_dca_vlc_bit_allocation.max_depth = 2;
for (i = 0; i < 5; i++)
DCA_INIT_VLC(ff_dca_vlc_bit_allocation.vlc[i], bitalloc_12_vlc_bits[i], 12);
DCA_INIT_VLC(ff_dca_vlc_bit_allocation.vlc[i], bitalloc_12_vlc_bits[i], 12, 1);
ff_dca_vlc_scale_factor.offset = -64;
ff_dca_vlc_scale_factor.max_depth = 2;
for (i = 0; i < 5; i++)
DCA_INIT_VLC(ff_dca_vlc_scale_factor.vlc[i], SCALES_VLC_BITS, 129);
DCA_INIT_VLC(ff_dca_vlc_scale_factor.vlc[i], SCALES_VLC_BITS, 129, -64);
for (unsigned i = 0; i < FF_ARRAY_ELEMS(ff_dca_vlc_transition_mode); i++)
DCA_INIT_VLC(ff_dca_vlc_transition_mode[i], DCA_TMODE_VLC_BITS, 4);
DCA_INIT_VLC(ff_dca_vlc_transition_mode[i], DCA_TMODE_VLC_BITS, 4, 0);
#define LBR_INIT_VLC(vlc, nb_bits, nb_codes) \
#define LBR_INIT_VLC(vlc, nb_bits, nb_codes, entry_offset) \
do { \
vlc.table = &dca_table[offset]; \
vlc.table_allocated = FF_ARRAY_ELEMS(dca_table) - offset; \
ff_init_vlc_from_lengths(&vlc, nb_bits, nb_codes, &src_table[0][1], 2, \
&src_table[0][0], 2, 1, 0, \
&src_table[0][0], 2, 1, entry_offset, \
INIT_VLC_STATIC_OVERLONG | INIT_VLC_LE,\
NULL); \
offset += vlc.table_size; \
@@ -838,16 +835,16 @@ av_cold void ff_dca_init_vlcs(void)
} while (0)
for (unsigned i = 0; i < FF_ARRAY_ELEMS(ff_dca_vlc_tnl_grp); i++)
LBR_INIT_VLC(ff_dca_vlc_tnl_grp[i], 9, tnl_grp_sizes[i]);
LBR_INIT_VLC(ff_dca_vlc_tnl_scf, 9, 20);
LBR_INIT_VLC(ff_dca_vlc_damp, 6, 7);
LBR_INIT_VLC(ff_dca_vlc_dph, 6, 9);
LBR_INIT_VLC(ff_dca_vlc_fst_rsd_amp, 9, 24);
LBR_INIT_VLC(ff_dca_vlc_rsd_apprx, 5, 6);
LBR_INIT_VLC(ff_dca_vlc_rsd_amp, 9, 33);
LBR_INIT_VLC(ff_dca_vlc_avg_g3, 9, 18);
LBR_INIT_VLC(ff_dca_vlc_st_grid, 9, 22);
LBR_INIT_VLC(ff_dca_vlc_grid_2, 9, 20);
LBR_INIT_VLC(ff_dca_vlc_grid_3, 9, 13);
LBR_INIT_VLC(ff_dca_vlc_rsd, 6, 9);
LBR_INIT_VLC(ff_dca_vlc_tnl_grp[i], 9, tnl_grp_sizes[i], -1);
LBR_INIT_VLC(ff_dca_vlc_tnl_scf, 9, 20, -1);
LBR_INIT_VLC(ff_dca_vlc_damp, 6, 7, -1);
LBR_INIT_VLC(ff_dca_vlc_dph, 6, 9, -1);
LBR_INIT_VLC(ff_dca_vlc_fst_rsd_amp, 9, 24, -1);
LBR_INIT_VLC(ff_dca_vlc_rsd_apprx, 5, 6, -1);
LBR_INIT_VLC(ff_dca_vlc_rsd_amp, 9, 33, -1);
LBR_INIT_VLC(ff_dca_vlc_avg_g3, 9, 18, -1);
LBR_INIT_VLC(ff_dca_vlc_st_grid, 9, 22, -1);
LBR_INIT_VLC(ff_dca_vlc_grid_2, 9, 20, -1);
LBR_INIT_VLC(ff_dca_vlc_grid_3, 9, 13, -1);
LBR_INIT_VLC(ff_dca_vlc_rsd, 6, 9, 0);
}

1
libavcodec/dcahuff.h
View File

@@ -36,7 +36,6 @@
+ 7 * (17 + 25 + 33 + 65 + 129))
typedef struct DCAVLC {
int offset; ///< Code values offset
int max_depth; ///< Parameter for get_vlc2()
VLC vlc[7]; ///< Actual codes
} DCAVLC;