Chiebot-Mirror
/
FFmpeg
mirror of https://github.com/FFmpeg/FFmpeg.git
8
0
Fork 0
Code Issues Projects Releases Wiki Activity

avcodec/qdmc: Apply offset when creating VLC

Browse Source 
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
pull/358/head
Andreas Rheinhardt 4 years ago
parent fb0ae037d0
commit b21d9339fe
1 changed files with 17 additions and 39 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 56
      libavcodec/qdmc.c

56
libavcodec/qdmc.c
Unescape View File

@ -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) {

Write Preview
Loading…
Cancel
Save