diff mbox series

[FFmpeg-devel,v2,065/162] avcodec/qdm2: Make tables used to initialize VLCs smaller

Message ID 20201120072116.818090-66-andreas.rheinhardt@gmail.com
State New
Headers show
Series VLC, esp. init_vlc patches
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Commit Message

Andreas Rheinhardt Nov. 20, 2020, 7:19 a.m. UTC
After permuting the codes, symbols and lengths tables used to initialize
the VLCs so that the codes are ordered from left to right in the Huffman
tree, the codes become redundant as they can be easily computed from the
lengths at runtime (or at compile time with --enable-hardcoded-tables);
in this case one has to use explicit symbol tables, but all the symbols
used here fit into an uint8_t, whereas some codes needed uint16_t.
Furthermore, the codes had holes because the range of the symbols was not
contiguous; these have also been removed.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
---
 libavcodec/qdm2_tablegen.h | 159 +++++---------------------
 libavcodec/qdm2data.h      | 226 ++++++++++++++-----------------------
 2 files changed, 109 insertions(+), 276 deletions(-)
diff mbox series

Patch

diff --git a/libavcodec/qdm2_tablegen.h b/libavcodec/qdm2_tablegen.h
index 2331ebfbb2..d91bd04dc8 100644
--- a/libavcodec/qdm2_tablegen.h
+++ b/libavcodec/qdm2_tablegen.h
@@ -115,145 +115,40 @@  static const uint16_t qdm2_vlc_offs[] = {
 
 static VLC_TYPE qdm2_table[3838][2];
 
-static av_cold void qdm2_init_vlc(void)
+static av_cold void build_vlc(VLC *vlc, int nb_bits, int nb_codes, int idx,
+                              const uint8_t tab[][2])
 {
-    vlc_tab_level.table           = &qdm2_table[qdm2_vlc_offs[0]];
-    vlc_tab_level.table_allocated = qdm2_vlc_offs[1] - qdm2_vlc_offs[0];
-    init_vlc(&vlc_tab_level, 8, 24,
-             vlc_tab_level_huffbits, 1, 1,
-             vlc_tab_level_huffcodes, 2, 2,
-             INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
-
-    vlc_tab_diff.table           = &qdm2_table[qdm2_vlc_offs[1]];
-    vlc_tab_diff.table_allocated = qdm2_vlc_offs[2] - qdm2_vlc_offs[1];
-    init_vlc(&vlc_tab_diff, 8, 37,
-             vlc_tab_diff_huffbits, 1, 1,
-             vlc_tab_diff_huffcodes, 2, 2,
-             INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
-
-    vlc_tab_run.table           = &qdm2_table[qdm2_vlc_offs[2]];
-    vlc_tab_run.table_allocated = qdm2_vlc_offs[3] - qdm2_vlc_offs[2];
-    init_vlc(&vlc_tab_run, 5, 6,
-             vlc_tab_run_huffbits, 1, 1,
-             vlc_tab_run_huffcodes, 1, 1,
-             INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
-
-    fft_level_exp_alt_vlc.table           = &qdm2_table[qdm2_vlc_offs[3]];
-    fft_level_exp_alt_vlc.table_allocated = qdm2_vlc_offs[4] -
-                                            qdm2_vlc_offs[3];
-    init_vlc(&fft_level_exp_alt_vlc, 8, 28,
-             fft_level_exp_alt_huffbits, 1, 1,
-             fft_level_exp_alt_huffcodes, 2, 2,
-             INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
-
-    fft_level_exp_vlc.table           = &qdm2_table[qdm2_vlc_offs[4]];
-    fft_level_exp_vlc.table_allocated = qdm2_vlc_offs[5] - qdm2_vlc_offs[4];
-    init_vlc(&fft_level_exp_vlc, 8, 20,
-             fft_level_exp_huffbits, 1, 1,
-             fft_level_exp_huffcodes, 2, 2,
-             INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
-
-    fft_stereo_exp_vlc.table           = &qdm2_table[qdm2_vlc_offs[5]];
-    fft_stereo_exp_vlc.table_allocated = qdm2_vlc_offs[6] -
-                                         qdm2_vlc_offs[5];
-    init_vlc(&fft_stereo_exp_vlc, 6, 7,
-             fft_stereo_exp_huffbits, 1, 1,
-             fft_stereo_exp_huffcodes, 1, 1,
-             INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
-
-    fft_stereo_phase_vlc.table           = &qdm2_table[qdm2_vlc_offs[6]];
-    fft_stereo_phase_vlc.table_allocated = qdm2_vlc_offs[7] -
-                                           qdm2_vlc_offs[6];
-    init_vlc(&fft_stereo_phase_vlc, 6, 9,
-             fft_stereo_phase_huffbits, 1, 1,
-             fft_stereo_phase_huffcodes, 1, 1,
-             INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
-
-    vlc_tab_tone_level_idx_hi1.table =
-        &qdm2_table[qdm2_vlc_offs[7]];
-    vlc_tab_tone_level_idx_hi1.table_allocated = qdm2_vlc_offs[8] -
-                                                 qdm2_vlc_offs[7];
-    init_vlc(&vlc_tab_tone_level_idx_hi1, 8, 20,
-             vlc_tab_tone_level_idx_hi1_huffbits, 1, 1,
-             vlc_tab_tone_level_idx_hi1_huffcodes, 2, 2,
-             INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
-
-    vlc_tab_tone_level_idx_mid.table =
-        &qdm2_table[qdm2_vlc_offs[8]];
-    vlc_tab_tone_level_idx_mid.table_allocated = qdm2_vlc_offs[9] -
-                                                 qdm2_vlc_offs[8];
-    init_vlc(&vlc_tab_tone_level_idx_mid, 8, 24,
-             vlc_tab_tone_level_idx_mid_huffbits, 1, 1,
-             vlc_tab_tone_level_idx_mid_huffcodes, 2, 2,
-             INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
-
-    vlc_tab_tone_level_idx_hi2.table =
-        &qdm2_table[qdm2_vlc_offs[9]];
-    vlc_tab_tone_level_idx_hi2.table_allocated = qdm2_vlc_offs[10] -
-                                                 qdm2_vlc_offs[9];
-    init_vlc(&vlc_tab_tone_level_idx_hi2, 8, 24,
-             vlc_tab_tone_level_idx_hi2_huffbits, 1, 1,
-             vlc_tab_tone_level_idx_hi2_huffcodes, 2, 2,
-             INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
-
-    vlc_tab_type30.table           = &qdm2_table[qdm2_vlc_offs[10]];
-    vlc_tab_type30.table_allocated = qdm2_vlc_offs[11] - qdm2_vlc_offs[10];
-    init_vlc(&vlc_tab_type30, 6, 9,
-             vlc_tab_type30_huffbits, 1, 1,
-             vlc_tab_type30_huffcodes, 1, 1,
-             INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
+    vlc->table           = &qdm2_table[qdm2_vlc_offs[idx]];
+    vlc->table_allocated = qdm2_vlc_offs[idx + 1] - qdm2_vlc_offs[idx];
+    ff_init_vlc_from_lengths(vlc, nb_bits, nb_codes,
+                             &tab[0][1], 2, &tab[0][0], 2, 1,
+                             0, INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE, NULL);
+}
 
-    vlc_tab_type34.table           = &qdm2_table[qdm2_vlc_offs[11]];
-    vlc_tab_type34.table_allocated = qdm2_vlc_offs[12] - qdm2_vlc_offs[11];
-    init_vlc(&vlc_tab_type34, 5, 10,
-             vlc_tab_type34_huffbits, 1, 1,
-             vlc_tab_type34_huffcodes, 1, 1,
-             INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
+static av_cold void qdm2_init_vlc(void)
+{
+    build_vlc(&vlc_tab_level, 8, 24, 0, tab_level);
+    build_vlc(&vlc_tab_diff,  8, 33, 1, tab_diff);
+    build_vlc(&vlc_tab_run,   5,  6, 2, tab_run);
 
-    vlc_tab_fft_tone_offset[0].table =
-        &qdm2_table[qdm2_vlc_offs[12]];
-    vlc_tab_fft_tone_offset[0].table_allocated = qdm2_vlc_offs[13] -
-                                                 qdm2_vlc_offs[12];
-    init_vlc(&vlc_tab_fft_tone_offset[0], 8, 23,
-             vlc_tab_fft_tone_offset_0_huffbits, 1, 1,
-             vlc_tab_fft_tone_offset_0_huffcodes, 2, 2,
-             INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
+    build_vlc(&fft_level_exp_alt_vlc, 8, 28, 3, fft_level_exp_alt);
+    build_vlc(&fft_level_exp_vlc,     8, 20, 4, fft_level_exp);
 
-    vlc_tab_fft_tone_offset[1].table =
-        &qdm2_table[qdm2_vlc_offs[13]];
-    vlc_tab_fft_tone_offset[1].table_allocated = qdm2_vlc_offs[14] -
-                                                 qdm2_vlc_offs[13];
-    init_vlc(&vlc_tab_fft_tone_offset[1], 8, 28,
-             vlc_tab_fft_tone_offset_1_huffbits, 1, 1,
-             vlc_tab_fft_tone_offset_1_huffcodes, 2, 2,
-             INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
+    build_vlc(&fft_stereo_exp_vlc,   6, 7, 5, fft_stereo_exp);
+    build_vlc(&fft_stereo_phase_vlc, 6, 9, 6, fft_stereo_phase);
 
-    vlc_tab_fft_tone_offset[2].table =
-        &qdm2_table[qdm2_vlc_offs[14]];
-    vlc_tab_fft_tone_offset[2].table_allocated = qdm2_vlc_offs[15] -
-                                                 qdm2_vlc_offs[14];
-    init_vlc(&vlc_tab_fft_tone_offset[2], 8, 32,
-             vlc_tab_fft_tone_offset_2_huffbits, 1, 1,
-             vlc_tab_fft_tone_offset_2_huffcodes, 2, 2,
-             INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
+    build_vlc(&vlc_tab_tone_level_idx_hi1, 8, 20, 7, tab_tone_level_idx_hi1);
+    build_vlc(&vlc_tab_tone_level_idx_mid, 8, 13, 8, tab_tone_level_idx_mid);
+    build_vlc(&vlc_tab_tone_level_idx_hi2, 8, 18, 9, tab_tone_level_idx_hi2);
 
-    vlc_tab_fft_tone_offset[3].table =
-        &qdm2_table[qdm2_vlc_offs[15]];
-    vlc_tab_fft_tone_offset[3].table_allocated = qdm2_vlc_offs[16] -
-                                                 qdm2_vlc_offs[15];
-    init_vlc(&vlc_tab_fft_tone_offset[3], 8, 35,
-             vlc_tab_fft_tone_offset_3_huffbits, 1, 1,
-             vlc_tab_fft_tone_offset_3_huffcodes, 2, 2,
-             INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
+    build_vlc(&vlc_tab_type30, 6,  9, 10, tab_type30);
+    build_vlc(&vlc_tab_type34, 5, 10, 11, tab_type34);
 
-    vlc_tab_fft_tone_offset[4].table =
-        &qdm2_table[qdm2_vlc_offs[16]];
-    vlc_tab_fft_tone_offset[4].table_allocated = qdm2_vlc_offs[17] -
-                                                 qdm2_vlc_offs[16];
-    init_vlc(&vlc_tab_fft_tone_offset[4], 8, 38,
-             vlc_tab_fft_tone_offset_4_huffbits, 1, 1,
-             vlc_tab_fft_tone_offset_4_huffcodes, 2, 2,
-             INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE);
+    build_vlc(&vlc_tab_fft_tone_offset[0], 8, 23, 12, tab_fft_tone_offset_0);
+    build_vlc(&vlc_tab_fft_tone_offset[1], 8, 28, 13, tab_fft_tone_offset_1);
+    build_vlc(&vlc_tab_fft_tone_offset[2], 8, 31, 14, tab_fft_tone_offset_2);
+    build_vlc(&vlc_tab_fft_tone_offset[3], 8, 34, 15, tab_fft_tone_offset_3);
+    build_vlc(&vlc_tab_fft_tone_offset[4], 8, 37, 16, tab_fft_tone_offset_4);
 }
 
 #endif /* CONFIG_HARDCODED_TABLES */
diff --git a/libavcodec/qdm2data.h b/libavcodec/qdm2data.h
index 355d61387b..69f66b4571 100644
--- a/libavcodec/qdm2data.h
+++ b/libavcodec/qdm2data.h
@@ -35,200 +35,138 @@ 
 /** VLC TABLES **/
 
 /* values in this table range from -1..23; adjust retrieved value by -1 */
-static const uint16_t vlc_tab_level_huffcodes[24] = {
-    0x037c, 0x0004, 0x003c, 0x004c, 0x003a, 0x002c, 0x001c, 0x001a,
-    0x0024, 0x0014, 0x0001, 0x0002, 0x0000, 0x0003, 0x0007, 0x0005,
-    0x0006, 0x0008, 0x0009, 0x000a, 0x000c, 0x00fc, 0x007c, 0x017c
-};
-
-static const uint8_t vlc_tab_level_huffbits[24] = {
-    10, 6, 7, 7, 6, 6, 6, 6, 6, 5, 4, 4, 4, 3, 3, 3, 3, 4, 4, 5, 7, 8, 9, 10
+static const uint8_t tab_level[24][2] = {
+    { 12,  4 }, { 17,  4 }, {  1,  6 }, {  8,  6 }, {  9,  5 }, { 20,  7 },
+    {  3,  7 }, {  5,  6 }, {  6,  6 }, {  2,  7 }, { 22,  9 }, { 23, 10 },
+    {  0, 10 }, { 21,  8 }, { 11,  4 }, { 19,  5 }, {  7,  6 }, {  4,  6 },
+    { 16,  3 }, { 10,  4 }, { 18,  4 }, { 15,  3 }, { 13,  3 }, { 14,  3 },
 };
 
 /* values in this table range from -1..36; adjust retrieved value by -1 */
-static const uint16_t vlc_tab_diff_huffcodes[37] = {
-    0x1c57, 0x0004, 0x0000, 0x0001, 0x0003, 0x0002, 0x000f, 0x000e,
-    0x0007, 0x0016, 0x0037, 0x0027, 0x0026, 0x0066, 0x0006, 0x0097,
-    0x0046, 0x01c6, 0x0017, 0x0786, 0x0086, 0x0257, 0x00d7, 0x0357,
-    0x00c6, 0x0386, 0x0186, 0x0000, 0x0157, 0x0c57, 0x0057, 0x0000,
-    0x0b86, 0x0000, 0x1457, 0x0000, 0x0457
-};
-
-static const uint8_t vlc_tab_diff_huffbits[37] = {
-    13, 3, 3, 2, 3, 3, 4, 4, 6, 5, 6, 6, 7, 7, 8, 8,
-    8, 9, 8, 11, 9, 10, 8, 10, 9, 12, 10, 0, 10, 13, 11, 0,
-    12, 0, 13, 0, 13
+static const uint8_t tab_diff[33][2] = {
+    {  2,  3 }, {  1,  3 }, {  5,  3 }, { 14,  8 }, { 20,  9 }, { 26, 10 },
+    { 25, 12 }, { 32, 12 }, { 19, 11 }, { 16,  8 }, { 24,  9 }, { 17,  9 },
+    { 12,  7 }, { 13,  7 }, {  9,  5 }, {  7,  4 }, {  3,  2 }, {  4,  3 },
+    {  8,  6 }, { 11,  6 }, { 18,  8 }, { 15,  8 }, { 30, 11 }, { 36, 13 },
+    { 34, 13 }, { 29, 13 }, {  0, 13 }, { 21, 10 }, { 28, 10 }, { 23, 10 },
+    { 22,  8 }, { 10,  6 }, {  6,  4 },
 };
 
 /* values in this table range from -1..5; adjust retrieved value by -1 */
-static const uint8_t vlc_tab_run_huffcodes[6] = {
-    0x1f, 0x00, 0x01, 0x03, 0x07, 0x0f
-};
-
-static const uint8_t vlc_tab_run_huffbits[6] = {
-    5, 1, 2, 3, 4, 5
+static const uint8_t tab_run[6][2] = {
+    { 1, 1 }, { 2, 2 }, { 3, 3 }, { 4, 4 }, { 5, 5 }, { 0, 5 },
 };
 
 /* values in this table range from -1..19; adjust retrieved value by -1 */
-static const uint16_t vlc_tab_tone_level_idx_hi1_huffcodes[20] = {
-    0x5714, 0x000c, 0x0002, 0x0001, 0x0000, 0x0004, 0x0034, 0x0054,
-    0x0094, 0x0014, 0x0114, 0x0214, 0x0314, 0x0614, 0x0e14, 0x0f14,
-    0x2714, 0x0714, 0x1714, 0x3714
-};
-
-static const uint8_t vlc_tab_tone_level_idx_hi1_huffbits[20] = {
-    15, 4, 2, 1, 3, 5, 6, 7, 8, 10, 10, 11, 11, 12, 12, 12, 14, 14, 15, 14
+static const uint8_t tab_tone_level_idx_hi1[20][2] = {
+    {  4,  3 }, {  5,  5 }, {  9, 10 }, { 11, 11 }, { 13, 12 }, { 14, 12 },
+    { 10, 10 }, { 12, 11 }, { 17, 14 }, { 16, 14 }, { 18, 15 }, {  0, 15 },
+    { 19, 14 }, { 15, 12 }, {  8,  8 }, {  7,  7 }, {  6,  6 }, {  1,  4 },
+    {  2,  2 }, {  3,  1 },
 };
 
 /* values in this table range from -1..23; adjust retrieved value by -1 */
-static const uint16_t vlc_tab_tone_level_idx_mid_huffcodes[24] = {
-    0x0fea, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
-    0x0000, 0x0000, 0x0000, 0x0000, 0x03ea, 0x00ea, 0x002a, 0x001a,
-    0x0006, 0x0001, 0x0000, 0x0002, 0x000a, 0x006a, 0x01ea, 0x07ea
-};
-
-static const uint8_t vlc_tab_tone_level_idx_mid_huffbits[24] = {
-    12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 9, 7, 5, 3, 1, 2, 4, 6, 8, 10, 12
+static const uint8_t tab_tone_level_idx_mid[13][2] = {
+    { 18,  2 }, { 19,  4 }, { 20,  6 }, { 14,  7 }, { 21,  8 }, { 13,  9 },
+    { 22, 10 }, { 12, 11 }, { 23, 12 }, {  0, 12 }, { 15,  5 }, { 16,  3 },
+    { 17,  1 },
 };
 
 /* values in this table range from -1..23; adjust retrieved value by -1 */
-static const uint16_t vlc_tab_tone_level_idx_hi2_huffcodes[24] = {
-    0x0664, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0064, 0x00e4,
-    0x00a4, 0x0068, 0x0004, 0x0008, 0x0014, 0x0018, 0x0000, 0x0001,
-    0x0002, 0x0003, 0x000c, 0x0028, 0x0024, 0x0164, 0x0000, 0x0264
-};
-
-static const uint8_t vlc_tab_tone_level_idx_hi2_huffbits[24] = {
-    11, 0, 0, 0, 0, 0, 10, 8, 8, 7, 6, 6, 5, 5, 4, 2, 2, 2, 4, 7, 8, 9, 0, 11
+static const uint8_t tab_tone_level_idx_hi2[18][2] = {
+    { 14,  4 }, { 11,  6 }, { 19,  7 }, {  9,  7 }, { 13,  5 }, { 10,  6 },
+    { 20,  8 }, {  8,  8 }, {  6, 10 }, { 23, 11 }, {  0, 11 }, { 21,  9 },
+    {  7,  8 }, { 12,  5 }, { 18,  4 }, { 16,  2 }, { 15,  2 }, { 17,  2 },
 };
 
 /* values in this table range from -1..8; adjust retrieved value by -1 */
-static const uint8_t vlc_tab_type30_huffcodes[9] = {
-    0x3c, 0x06, 0x00, 0x01, 0x03, 0x02, 0x04, 0x0c, 0x1c
-};
-
-static const uint8_t vlc_tab_type30_huffbits[9] = {
-    6, 3, 3, 2, 2, 3, 4, 5, 6
+static const uint8_t tab_type30[9][2] = {
+    { 2, 3 }, { 6, 4 }, { 7, 5 }, { 8, 6 }, { 0, 6 }, { 5, 3 }, { 1, 3 },
+    { 3, 2 }, { 4, 2 },
 };
 
 /* values in this table range from -1..9; adjust retrieved value by -1 */
-static const uint8_t vlc_tab_type34_huffcodes[10] = {
-    0x18, 0x00, 0x01, 0x04, 0x05, 0x07, 0x03, 0x02, 0x06, 0x08
-};
-
-static const uint8_t vlc_tab_type34_huffbits[10] = {
-    5, 4, 3, 3, 3, 3, 3, 3, 3, 5
+static const uint8_t tab_type34[10][2] = {
+    { 1, 4 }, { 9, 5 }, { 0, 5 }, { 3, 3 }, { 7, 3 }, { 8, 3 }, { 2, 3 },
+    { 4, 3 }, { 6, 3 }, { 5, 3 },
 };
 
 /* values in this table range from -1..22; adjust retrieved value by -1 */
-static const uint16_t vlc_tab_fft_tone_offset_0_huffcodes[23] = {
-    0x038e, 0x0001, 0x0000, 0x0022, 0x000a, 0x0006, 0x0012, 0x0002,
-    0x001e, 0x003e, 0x0056, 0x0016, 0x000e, 0x0032, 0x0072, 0x0042,
-    0x008e, 0x004e, 0x00f2, 0x002e, 0x0036, 0x00c2, 0x018e
-};
-
-static const uint8_t vlc_tab_fft_tone_offset_0_huffbits[23] = {
-    10, 1, 2, 6, 4, 5, 6, 7, 6, 6, 7, 7, 8, 7, 8, 8, 9, 7, 8, 6, 6, 8, 10
+static const uint8_t tab_fft_tone_offset_0[23][2] = {
+    {  2,  2 }, {  7,  7 }, { 15,  8 }, { 21,  8 }, {  3,  6 }, {  6,  6 },
+    { 13,  7 }, { 14,  8 }, { 18,  8 }, {  4,  4 }, {  5,  5 }, { 11,  7 },
+    { 10,  7 }, { 20,  6 }, { 12,  8 }, { 16,  9 }, { 22, 10 }, {  0, 10 },
+    { 17,  7 }, { 19,  6 }, {  8,  6 }, {  9,  6 }, {  1,  1 },
 };
 
 /* values in this table range from -1..27; adjust retrieved value by -1 */
-static const uint16_t vlc_tab_fft_tone_offset_1_huffcodes[28] = {
-    0x07a4, 0x0001, 0x0020, 0x0012, 0x001c, 0x0008, 0x0006, 0x0010,
-    0x0000, 0x0014, 0x0004, 0x0032, 0x0070, 0x000c, 0x0002, 0x003a,
-    0x001a, 0x002c, 0x002a, 0x0022, 0x0024, 0x000a, 0x0064, 0x0030,
-    0x0062, 0x00a4, 0x01a4, 0x03a4
-};
-
-static const uint8_t vlc_tab_fft_tone_offset_1_huffbits[28] = {
-    11, 1, 6, 6, 5, 4, 3, 6, 6, 5, 6, 6, 7, 6, 6, 6,
-    6, 6, 6, 7, 8, 6, 7, 7, 7, 9, 10, 11
+static const uint8_t tab_fft_tone_offset_1[28][2] = {
+    {  8,  6 }, {  2,  6 }, {  7,  6 }, { 23,  7 }, { 12,  7 }, {  5,  4 },
+    { 10,  6 }, { 20,  8 }, { 25,  9 }, { 26, 10 }, { 27, 11 }, {  0, 11 },
+    { 22,  7 }, {  9,  5 }, { 13,  6 }, { 17,  6 }, {  4,  5 }, { 14,  6 },
+    { 19,  7 }, { 24,  7 }, {  3,  6 }, { 11,  6 }, { 21,  6 }, { 18,  6 },
+    { 16,  6 }, { 15,  6 }, {  6,  3 }, {  1,  1 },
 };
 
 /* values in this table range from -1..31; adjust retrieved value by -1 */
-static const uint16_t vlc_tab_fft_tone_offset_2_huffcodes[32] = {
-    0x1760, 0x0001, 0x0000, 0x0082, 0x000c, 0x0006, 0x0003, 0x0007,
-    0x0008, 0x0004, 0x0010, 0x0012, 0x0022, 0x001a, 0x0000, 0x0020,
-    0x000a, 0x0040, 0x004a, 0x006a, 0x002a, 0x0042, 0x0002, 0x0060,
-    0x00aa, 0x00e0, 0x00c2, 0x01c2, 0x0160, 0x0360, 0x0760, 0x0f60
-};
-
-static const uint8_t vlc_tab_fft_tone_offset_2_huffbits[32] = {
-    13, 2, 0, 8, 4, 3, 3, 3, 4, 4, 5, 5, 6, 5, 7, 7,
-    7, 7, 7, 7, 8, 8, 8, 9, 8, 8, 9, 9, 10, 11, 13, 12
+static const uint8_t tab_fft_tone_offset_2[31][2] = {
+    { 14,  7 }, { 17,  7 }, { 15,  7 }, { 23,  9 }, { 28, 10 }, { 29, 11 },
+    { 30, 13 }, {  0, 13 }, { 31, 12 }, { 25,  8 }, { 10,  5 }, {  8,  4 },
+    {  9,  4 }, {  4,  4 }, { 22,  8 }, {  3,  8 }, { 21,  8 }, { 26,  9 },
+    { 27,  9 }, { 12,  6 }, { 11,  5 }, { 16,  7 }, { 18,  7 }, { 20,  8 },
+    { 24,  8 }, { 19,  7 }, { 13,  5 }, {  5,  3 }, {  1,  2 }, {  6,  3 },
+    {  7,  3 },
 };
 
 /* values in this table range from -1..34; adjust retrieved value by -1 */
-static const uint16_t vlc_tab_fft_tone_offset_3_huffcodes[35] = {
-    0x33ea, 0x0005, 0x0000, 0x000c, 0x0000, 0x0006, 0x0003, 0x0008,
-    0x0002, 0x0001, 0x0004, 0x0007, 0x001a, 0x000f, 0x001c, 0x002c,
-    0x000a, 0x001d, 0x002d, 0x002a, 0x000d, 0x004c, 0x008c, 0x006a,
-    0x00cd, 0x004d, 0x00ea, 0x020c, 0x030c, 0x010c, 0x01ea, 0x07ea,
-    0x0bea, 0x03ea, 0x13ea
-};
-
-static const uint8_t vlc_tab_fft_tone_offset_3_huffbits[35] = {
-    14, 4, 0, 10, 4, 3, 3, 4, 4, 3, 4, 4, 5, 4, 5, 6,
-    6, 5, 6, 7, 7, 7, 8, 8, 8, 8, 9, 10, 10, 10, 10, 11,
-    12, 13, 14
+static const uint8_t tab_fft_tone_offset_3[34][2] = {
+    {  4,  4 }, {  7,  4 }, { 10,  4 }, {  3, 10 }, { 27, 10 }, { 29, 10 },
+    { 28, 10 }, { 22,  8 }, { 21,  7 }, { 15,  6 }, { 14,  5 }, {  8,  4 },
+    { 16,  6 }, { 19,  7 }, { 23,  8 }, { 26,  9 }, { 30, 10 }, { 33, 13 },
+    { 34, 14 }, {  0, 14 }, { 32, 12 }, { 31, 11 }, { 12,  5 }, {  5,  3 },
+    {  9,  3 }, {  1,  4 }, { 20,  7 }, { 25,  8 }, { 24,  8 }, { 18,  6 },
+    { 17,  5 }, {  6,  3 }, { 11,  4 }, { 13,  4 },
 };
 
 /* values in this table range from -1..37; adjust retrieved value by -1 */
-static const uint16_t vlc_tab_fft_tone_offset_4_huffcodes[38] = {
-    0x5282, 0x0016, 0x0000, 0x0136, 0x0004, 0x0000, 0x0007, 0x000a,
-    0x000e, 0x0003, 0x0001, 0x000d, 0x0006, 0x0009, 0x0012, 0x0005,
-    0x0025, 0x0022, 0x0015, 0x0002, 0x0076, 0x0035, 0x0042, 0x00c2,
-    0x0182, 0x00b6, 0x0036, 0x03c2, 0x0482, 0x01c2, 0x0682, 0x0882,
-    0x0a82, 0x0082, 0x0282, 0x1282, 0x3282, 0x2282
-};
-
-static const uint8_t vlc_tab_fft_tone_offset_4_huffbits[38] = {
-    15, 6, 0, 9, 3, 3, 3, 4, 4, 3, 4, 4, 5, 4, 5, 6,
-    6, 6, 6, 8, 7, 6, 8, 9, 9, 8, 9, 10, 11, 10, 11, 12,
-    12, 12, 14, 15, 14, 14
+static const uint8_t tab_fft_tone_offset_4[37][2] = {
+    {  5,  3 }, {  4,  3 }, { 19,  8 }, { 33, 12 }, { 31, 12 }, { 28, 11 },
+    { 34, 14 }, { 37, 14 }, { 35, 15 }, {  0, 15 }, { 36, 14 }, { 32, 12 },
+    { 30, 11 }, { 24,  9 }, { 22,  8 }, { 23,  9 }, { 29, 10 }, { 27, 10 },
+    { 17,  6 }, { 14,  5 }, {  7,  4 }, { 12,  5 }, {  1,  6 }, { 26,  9 },
+    {  3,  9 }, { 25,  8 }, { 20,  7 }, {  8,  4 }, { 10,  4 }, { 13,  4 },
+    { 15,  6 }, { 16,  6 }, { 18,  6 }, { 21,  6 }, { 11,  4 }, {  9,  3 },
+    {  6,  3 },
 };
 
 /** FFT TABLES **/
 
 /* values in this table range from -1..27; adjust retrieved value by -1 */
-static const uint16_t fft_level_exp_alt_huffcodes[28] = {
-    0x1ec6, 0x0006, 0x00c2, 0x0142, 0x0242, 0x0246, 0x00c6, 0x0046,
-    0x0042, 0x0146, 0x00a2, 0x0062, 0x0026, 0x0016, 0x000e, 0x0005,
-    0x0004, 0x0003, 0x0000, 0x0001, 0x000a, 0x0012, 0x0002, 0x0022,
-    0x01c6, 0x02c6, 0x06c6, 0x0ec6
-};
-
-static const uint8_t fft_level_exp_alt_huffbits[28] = {
-    13, 7, 8, 9, 10, 10, 10, 10, 10, 9, 8, 7, 6, 5, 4, 3,
-    3, 2, 3, 3, 4, 5, 7, 8, 9, 11, 12, 13
+static const uint8_t fft_level_exp_alt[28][2] = {
+    { 18,  3 }, { 16,  3 }, { 22,  7 }, {  8, 10 }, {  4, 10 }, {  3,  9 },
+    {  2,  8 }, { 23,  8 }, { 10,  8 }, { 11,  7 }, { 21,  5 }, { 20,  4 },
+    {  1,  7 }, {  7, 10 }, {  5, 10 }, {  9,  9 }, {  6, 10 }, { 25, 11 },
+    { 26, 12 }, { 27, 13 }, {  0, 13 }, { 24,  9 }, { 12,  6 }, { 13,  5 },
+    { 14,  4 }, { 19,  3 }, { 15,  3 }, { 17,  2 },
 };
 
 /* values in this table range from -1..19; adjust retrieved value by -1 */
-static const uint16_t fft_level_exp_huffcodes[20] = {
-    0x0f24, 0x0001, 0x0002, 0x0000, 0x0006, 0x0005, 0x0007, 0x000c,
-    0x000b, 0x0014, 0x0013, 0x0004, 0x0003, 0x0023, 0x0064, 0x00a4,
-    0x0024, 0x0124, 0x0324, 0x0724
-};
-
-static const uint8_t fft_level_exp_huffbits[20] = {
-    12, 3, 3, 3, 3, 3, 3, 4, 4, 5, 5, 6, 6, 6, 7, 8, 9, 10, 11, 12
+static const uint8_t fft_level_exp[20][2] = {
+    {  3,  3 }, { 11,  6 }, { 16,  9 }, { 17, 10 }, { 18, 11 }, { 19, 12 },
+    {  0, 12 }, { 15,  8 }, { 14,  7 }, {  9,  5 }, {  7,  4 }, {  2,  3 },
+    {  4,  3 }, {  1,  3 }, {  5,  3 }, { 12,  6 }, { 13,  6 }, { 10,  5 },
+    {  8,  4 }, {  6,  3 },
 };
 
 /* values in this table range from -1..6; adjust retrieved value by -1 */
-static const uint8_t fft_stereo_exp_huffcodes[7] = {
-    0x3e, 0x01, 0x00, 0x02, 0x06, 0x0e, 0x1e
-};
-
-static const uint8_t fft_stereo_exp_huffbits[7] = {
-    6, 1, 2, 3, 4, 5, 6
+static const uint8_t fft_stereo_exp[7][2] = {
+    { 2, 2 }, { 3, 3 }, { 4, 4 }, { 5, 5 }, { 6, 6 }, { 0, 6 }, { 1, 1 },
 };
 
 /* values in this table range from -1..8; adjust retrieved value by -1 */
-static const uint8_t fft_stereo_phase_huffcodes[9] = {
-    0x35, 0x02, 0x00, 0x01, 0x0d, 0x15, 0x05, 0x09, 0x03
-};
-
-static const uint8_t fft_stereo_phase_huffbits[9] = {
-    6, 2, 2, 4, 4, 6, 5, 4, 2
+static const uint8_t fft_stereo_phase[9][2] = {
+    { 2, 2 }, { 1, 2 }, { 3, 4 }, { 7, 4 }, { 6, 5 }, { 5, 6 }, { 0, 6 },
+    { 4, 4 }, { 8, 2 },
 };
 
 static const int fft_cutoff_index_table[4][2] = {