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atrac9dec: clean up code slightly

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Just remove some dead variable assignments, unneeded variables and
change the FFMAX order to something more readable. Still identical.

Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
This commit is contained in:
Rostislav Pehlivanov 2018-08-28 04:25:35 +01:00
parent ea82ff81e4
commit 964819fefd
1 changed files with 4 additions and 7 deletions
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11
libavcodec/atrac9dec.c
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@ -61,7 +61,6 @@ typedef struct ATRAC9BlockData {
int has_band_ext; int has_band_ext;
int has_band_ext_data; int has_band_ext_data;
int band_ext_q_unit; int band_ext_q_unit;
int band_ext_mode;
/* Gradient */ /* Gradient */
int grad_mode; int grad_mode;
@ -215,7 +214,7 @@ static inline int parse_band_ext(ATRAC9Context *s, ATRAC9BlockData *b,
return 0; return 0;
if (!b->has_band_ext) { if (!b->has_band_ext) {
b->band_ext_mode = get_bits(gb, 2); skip_bits(gb, 2);
skip_bits_long(gb, get_bits(gb, 5)); skip_bits_long(gb, get_bits(gb, 5));
return 0; return 0;
} }
@ -501,7 +500,7 @@ static inline void fill_with_noise(ATRAC9Context *s, ATRAC9ChannelData *c,
av_bmg_get(&s->lfg, tmp); av_bmg_get(&s->lfg, tmp);
c->coeffs[start + i + 0] = tmp[0]; c->coeffs[start + i + 0] = tmp[0];
c->coeffs[start + i + 1] = tmp[1]; c->coeffs[start + i + 1] = tmp[1];
maxval = FFMAX(FFABS(tmp[0]), FFMAX(FFABS(tmp[1]), maxval)); maxval = FFMAX(FFMAX(FFABS(tmp[0]), FFABS(tmp[1])), maxval);
} }
/* Normalize */ /* Normalize */
for (int i = 0; i < count; i++) for (int i = 0; i < count; i++)
@ -522,7 +521,6 @@ static inline void scale_band_ext_coeffs(ATRAC9ChannelData *c, float sf[6],
static inline void apply_band_extension(ATRAC9Context *s, ATRAC9BlockData *b, static inline void apply_band_extension(ATRAC9Context *s, ATRAC9BlockData *b,
const int stereo) const int stereo)
{ {
const int bc = at9_tab_band_ext_group[b->q_unit_cnt - 13][2];
const int g_units[4] = { /* A, B, C, total units */ const int g_units[4] = { /* A, B, C, total units */
b->q_unit_cnt, b->q_unit_cnt,
at9_tab_band_ext_group[b->q_unit_cnt - 13][0], at9_tab_band_ext_group[b->q_unit_cnt - 13][0],
@ -550,11 +548,11 @@ static inline void apply_band_extension(ATRAC9Context *s, ATRAC9BlockData *b,
switch (c->band_ext) { switch (c->band_ext) {
case 0: { case 0: {
int l;
float sf[6] = { 0.0f }; float sf[6] = { 0.0f };
const int l = g_units[3] - g_units[0] - 1;
const int n_start = at9_q_unit_to_coeff_idx[g_units[3] - 1]; const int n_start = at9_q_unit_to_coeff_idx[g_units[3] - 1];
const int n_cnt = at9_q_unit_to_coeff_cnt[g_units[3] - 1]; const int n_cnt = at9_q_unit_to_coeff_cnt[g_units[3] - 1];
switch (bc) { switch (at9_tab_band_ext_group[b->q_unit_cnt - 13][2]) {
case 3: case 3:
sf[0] = at9_band_ext_scales_m0[0][0][c->band_ext_data[0]]; sf[0] = at9_band_ext_scales_m0[0][0][c->band_ext_data[0]];
sf[1] = at9_band_ext_scales_m0[0][1][c->band_ext_data[0]]; sf[1] = at9_band_ext_scales_m0[0][1][c->band_ext_data[0]];
@ -576,7 +574,6 @@ static inline void apply_band_extension(ATRAC9Context *s, ATRAC9BlockData *b,
break; break;
} }
l = g_units[3] - g_units[0] - 1;
sf[l] = at9_scalefactor_c[c->scalefactors[g_units[0]]]; sf[l] = at9_scalefactor_c[c->scalefactors[g_units[0]]];
fill_with_noise(s, c, n_start, n_cnt); fill_with_noise(s, c, n_start, n_cnt);