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avcodec/qdmc: Apply offset when creating VLC 

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-11-08 11:05:15 +01:00
parent fb0ae037d0
commit b21d9339fe
1 changed files with 17 additions and 39 deletions
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56
libavcodec/qdmc.c
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@ -151,58 +151,38 @@ static const uint8_t freq_diff[][2] = {
{ 18, 6 }, { 6, 4 }, { 12, 5 }, { 21, 6 }, { 25, 6 },
};
static const uint8_t amplitude_diff_bits[] = {
8, 2, 1, 3, 4, 5, 6, 7, 8,
static const uint8_t amplitude_diff[][2] = {
{ 1, 2 }, { 3, 3 }, { 4, 4 }, { 5, 5 }, { 6, 6 }, { 7, 7 },
{ 8, 8 }, { 0, 8 }, { 2, 1 },
};
static const uint8_t amplitude_diff_codes[] = {
0xFE, 0x0, 0x1, 0x2, 0x6, 0xE, 0x1E, 0x3E, 0x7E,
static const uint8_t phase_diff[][2] = {
{ 2, 2 }, { 1, 2 }, { 3, 4 }, { 7, 4 }, { 6, 5 }, { 5, 6 },
{ 0, 6 }, { 4, 4 }, { 8, 2 },
};
static const uint8_t phase_diff_bits[] = {
6, 2, 2, 4, 4, 6, 5, 4, 2,
};
static const uint8_t phase_diff_codes[] = {
0x35, 0x2, 0x0, 0x1, 0xD, 0x15, 0x5, 0x9, 0x3,
};
#define INIT_VLC_STATIC_LE(vlc, nb_bits, nb_codes, \
bits, bits_wrap, bits_size, \
codes, codes_wrap, codes_size, \
symbols, symbols_wrap, symbols_size, \
static_size) \
do { \
static VLC_TYPE table[static_size][2]; \
(vlc)->table = table; \
(vlc)->table_allocated = static_size; \
ff_init_vlc_sparse(vlc, nb_bits, nb_codes, \
bits, bits_wrap, bits_size, \
codes, codes_wrap, codes_size, \
symbols, symbols_wrap, symbols_size, \
INIT_VLC_LE | INIT_VLC_USE_NEW_STATIC); \
} while (0)
static av_cold void qdmc_init_static_data(void)
{
int i;
INIT_VLC_STATIC_FROM_LENGTHS(&vtable[0], 12, FF_ARRAY_ELEMS(noise_value),
&noise_value[0][1], 2,
&noise_value[0][0], 2, 1, 0, INIT_VLC_LE, 4096);
&noise_value[0][0], 2, 1, -1, INIT_VLC_LE, 4096);
INIT_VLC_STATIC_FROM_LENGTHS(&vtable[1], 10, FF_ARRAY_ELEMS(noise_segment_length),
&noise_segment_length[0][1], 2,
&noise_segment_length[0][0], 2, 1, 0, INIT_VLC_LE, 1024);
&noise_segment_length[0][0], 2, 1, -1, INIT_VLC_LE, 1024);
INIT_VLC_STATIC_FROM_LENGTHS(&vtable[2], 12, FF_ARRAY_ELEMS(amplitude),
&amplitude[0][1], 2,
&amplitude[0][0], 2, 1, 0, INIT_VLC_LE, 4098);
&amplitude[0][0], 2, 1, -1, INIT_VLC_LE, 4098);
INIT_VLC_STATIC_FROM_LENGTHS(&vtable[3], 12, FF_ARRAY_ELEMS(freq_diff),
&freq_diff[0][1], 2,
&freq_diff[0][0], 2, 1, 0, INIT_VLC_LE, 4160);
INIT_VLC_STATIC_LE(&vtable[4], 8, FF_ARRAY_ELEMS(amplitude_diff_bits),
amplitude_diff_bits, 1, 1, amplitude_diff_codes, 1, 1, NULL, 0, 0, 256);
INIT_VLC_STATIC_LE(&vtable[5], 6, FF_ARRAY_ELEMS(phase_diff_bits),
phase_diff_bits, 1, 1, phase_diff_codes, 1, 1, NULL, 0, 0, 64);
&freq_diff[0][0], 2, 1, -1, INIT_VLC_LE, 4160);
INIT_VLC_STATIC_FROM_LENGTHS(&vtable[4], 8, FF_ARRAY_ELEMS(amplitude_diff),
&amplitude_diff[0][1], 2,
&amplitude_diff[0][0], 2, 1, -1, INIT_VLC_LE, 256);
INIT_VLC_STATIC_FROM_LENGTHS(&vtable[5], 6, FF_ARRAY_ELEMS(phase_diff),
&phase_diff[0][1], 2,
&phase_diff[0][0], 2, 1, -1, INIT_VLC_LE, 64);
for (i = 0; i < 512; i++)
sin_table[i] = sin(2.0f * i * M_PI * 0.001953125f);
@ -351,9 +331,7 @@ static int qdmc_get_vlc(GetBitContext *gb, VLC *table, int flag)
if (get_bits_left(gb) < 1)
return AVERROR_INVALIDDATA;
v = get_vlc2(gb, table->table, table->bits, 2);
if (v)
v = v - 1;
else
if (v < 0)
v = get_bits(gb, get_bits(gb, 3) + 1);
if (flag) {