| /* |
| * Copyright (c) 2012 Andrew D'Addesio |
| * Copyright (c) 2013-2014 Mozilla Corporation |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * Opus CELT decoder |
| */ |
| |
| #include <stdint.h> |
| |
| #include "libavutil/float_dsp.h" |
| #include "libavutil/libm.h" |
| |
| #include "imdct15.h" |
| #include "opus.h" |
| |
| enum CeltSpread { |
| CELT_SPREAD_NONE, |
| CELT_SPREAD_LIGHT, |
| CELT_SPREAD_NORMAL, |
| CELT_SPREAD_AGGRESSIVE |
| }; |
| |
| typedef struct CeltFrame { |
| float energy[CELT_MAX_BANDS]; |
| float prev_energy[2][CELT_MAX_BANDS]; |
| |
| uint8_t collapse_masks[CELT_MAX_BANDS]; |
| |
| /* buffer for mdct output + postfilter */ |
| DECLARE_ALIGNED(32, float, buf)[2048]; |
| |
| /* postfilter parameters */ |
| int pf_period_new; |
| float pf_gains_new[3]; |
| int pf_period; |
| float pf_gains[3]; |
| int pf_period_old; |
| float pf_gains_old[3]; |
| |
| float deemph_coeff; |
| } CeltFrame; |
| |
| struct CeltContext { |
| // constant values that do not change during context lifetime |
| AVCodecContext *avctx; |
| IMDCT15Context *imdct[4]; |
| AVFloatDSPContext *dsp; |
| int output_channels; |
| |
| // values that have inter-frame effect and must be reset on flush |
| CeltFrame frame[2]; |
| uint32_t seed; |
| int flushed; |
| |
| // values that only affect a single frame |
| int coded_channels; |
| int framebits; |
| int duration; |
| |
| /* number of iMDCT blocks in the frame */ |
| int blocks; |
| /* size of each block */ |
| int blocksize; |
| |
| int startband; |
| int endband; |
| int codedbands; |
| |
| int anticollapse_bit; |
| |
| int intensitystereo; |
| int dualstereo; |
| enum CeltSpread spread; |
| |
| int remaining; |
| int remaining2; |
| int fine_bits [CELT_MAX_BANDS]; |
| int fine_priority[CELT_MAX_BANDS]; |
| int pulses [CELT_MAX_BANDS]; |
| int tf_change [CELT_MAX_BANDS]; |
| |
| DECLARE_ALIGNED(32, float, coeffs)[2][CELT_MAX_FRAME_SIZE]; |
| DECLARE_ALIGNED(32, float, scratch)[22 * 8]; // MAX(celt_freq_range) * 1<<CELT_MAX_LOG_BLOCKS |
| }; |
| |
| static const uint16_t celt_model_tapset[] = { 4, 2, 3, 4 }; |
| |
| static const uint16_t celt_model_spread[] = { 32, 7, 9, 30, 32 }; |
| |
| static const uint16_t celt_model_alloc_trim[] = { |
| 128, 2, 4, 9, 19, 41, 87, 109, 119, 124, 126, 128 |
| }; |
| |
| static const uint16_t celt_model_energy_small[] = { 4, 2, 3, 4 }; |
| |
| static const uint8_t celt_freq_bands[] = { /* in steps of 200Hz */ |
| 0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16, 20, 24, 28, 34, 40, 48, 60, 78, 100 |
| }; |
| |
| static const uint8_t celt_freq_range[] = { |
| 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 4, 4, 4, 6, 6, 8, 12, 18, 22 |
| }; |
| |
| static const uint8_t celt_log_freq_range[] = { |
| 0, 0, 0, 0, 0, 0, 0, 0, 8, 8, 8, 8, 16, 16, 16, 21, 21, 24, 29, 34, 36 |
| }; |
| |
| static const int8_t celt_tf_select[4][2][2][2] = { |
| { { { 0, -1 }, { 0, -1 } }, { { 0, -1 }, { 0, -1 } } }, |
| { { { 0, -1 }, { 0, -2 } }, { { 1, 0 }, { 1, -1 } } }, |
| { { { 0, -2 }, { 0, -3 } }, { { 2, 0 }, { 1, -1 } } }, |
| { { { 0, -2 }, { 0, -3 } }, { { 3, 0 }, { 1, -1 } } } |
| }; |
| |
| static const float celt_mean_energy[] = { |
| 6.437500f, 6.250000f, 5.750000f, 5.312500f, 5.062500f, |
| 4.812500f, 4.500000f, 4.375000f, 4.875000f, 4.687500f, |
| 4.562500f, 4.437500f, 4.875000f, 4.625000f, 4.312500f, |
| 4.500000f, 4.375000f, 4.625000f, 4.750000f, 4.437500f, |
| 3.750000f, 3.750000f, 3.750000f, 3.750000f, 3.750000f |
| }; |
| |
| static const float celt_alpha_coef[] = { |
| 29440.0f/32768.0f, 26112.0f/32768.0f, 21248.0f/32768.0f, 16384.0f/32768.0f |
| }; |
| |
| static const float celt_beta_coef[] = { /* TODO: precompute 1 minus this if the code ends up neater */ |
| 30147.0f/32768.0f, 22282.0f/32768.0f, 12124.0f/32768.0f, 6554.0f/32768.0f |
| }; |
| |
| static const uint8_t celt_coarse_energy_dist[4][2][42] = { |
| { |
| { // 120-sample inter |
| 72, 127, 65, 129, 66, 128, 65, 128, 64, 128, 62, 128, 64, 128, |
| 64, 128, 92, 78, 92, 79, 92, 78, 90, 79, 116, 41, 115, 40, |
| 114, 40, 132, 26, 132, 26, 145, 17, 161, 12, 176, 10, 177, 11 |
| }, { // 120-sample intra |
| 24, 179, 48, 138, 54, 135, 54, 132, 53, 134, 56, 133, 55, 132, |
| 55, 132, 61, 114, 70, 96, 74, 88, 75, 88, 87, 74, 89, 66, |
| 91, 67, 100, 59, 108, 50, 120, 40, 122, 37, 97, 43, 78, 50 |
| } |
| }, { |
| { // 240-sample inter |
| 83, 78, 84, 81, 88, 75, 86, 74, 87, 71, 90, 73, 93, 74, |
| 93, 74, 109, 40, 114, 36, 117, 34, 117, 34, 143, 17, 145, 18, |
| 146, 19, 162, 12, 165, 10, 178, 7, 189, 6, 190, 8, 177, 9 |
| }, { // 240-sample intra |
| 23, 178, 54, 115, 63, 102, 66, 98, 69, 99, 74, 89, 71, 91, |
| 73, 91, 78, 89, 86, 80, 92, 66, 93, 64, 102, 59, 103, 60, |
| 104, 60, 117, 52, 123, 44, 138, 35, 133, 31, 97, 38, 77, 45 |
| } |
| }, { |
| { // 480-sample inter |
| 61, 90, 93, 60, 105, 42, 107, 41, 110, 45, 116, 38, 113, 38, |
| 112, 38, 124, 26, 132, 27, 136, 19, 140, 20, 155, 14, 159, 16, |
| 158, 18, 170, 13, 177, 10, 187, 8, 192, 6, 175, 9, 159, 10 |
| }, { // 480-sample intra |
| 21, 178, 59, 110, 71, 86, 75, 85, 84, 83, 91, 66, 88, 73, |
| 87, 72, 92, 75, 98, 72, 105, 58, 107, 54, 115, 52, 114, 55, |
| 112, 56, 129, 51, 132, 40, 150, 33, 140, 29, 98, 35, 77, 42 |
| } |
| }, { |
| { // 960-sample inter |
| 42, 121, 96, 66, 108, 43, 111, 40, 117, 44, 123, 32, 120, 36, |
| 119, 33, 127, 33, 134, 34, 139, 21, 147, 23, 152, 20, 158, 25, |
| 154, 26, 166, 21, 173, 16, 184, 13, 184, 10, 150, 13, 139, 15 |
| }, { // 960-sample intra |
| 22, 178, 63, 114, 74, 82, 84, 83, 92, 82, 103, 62, 96, 72, |
| 96, 67, 101, 73, 107, 72, 113, 55, 118, 52, 125, 52, 118, 52, |
| 117, 55, 135, 49, 137, 39, 157, 32, 145, 29, 97, 33, 77, 40 |
| } |
| } |
| }; |
| |
| static const uint8_t celt_static_alloc[11][21] = { /* 1/32 bit/sample */ |
| { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
| { 90, 80, 75, 69, 63, 56, 49, 40, 34, 29, 20, 18, 10, 0, 0, 0, 0, 0, 0, 0, 0 }, |
| { 110, 100, 90, 84, 78, 71, 65, 58, 51, 45, 39, 32, 26, 20, 12, 0, 0, 0, 0, 0, 0 }, |
| { 118, 110, 103, 93, 86, 80, 75, 70, 65, 59, 53, 47, 40, 31, 23, 15, 4, 0, 0, 0, 0 }, |
| { 126, 119, 112, 104, 95, 89, 83, 78, 72, 66, 60, 54, 47, 39, 32, 25, 17, 12, 1, 0, 0 }, |
| { 134, 127, 120, 114, 103, 97, 91, 85, 78, 72, 66, 60, 54, 47, 41, 35, 29, 23, 16, 10, 1 }, |
| { 144, 137, 130, 124, 113, 107, 101, 95, 88, 82, 76, 70, 64, 57, 51, 45, 39, 33, 26, 15, 1 }, |
| { 152, 145, 138, 132, 123, 117, 111, 105, 98, 92, 86, 80, 74, 67, 61, 55, 49, 43, 36, 20, 1 }, |
| { 162, 155, 148, 142, 133, 127, 121, 115, 108, 102, 96, 90, 84, 77, 71, 65, 59, 53, 46, 30, 1 }, |
| { 172, 165, 158, 152, 143, 137, 131, 125, 118, 112, 106, 100, 94, 87, 81, 75, 69, 63, 56, 45, 20 }, |
| { 200, 200, 200, 200, 200, 200, 200, 200, 198, 193, 188, 183, 178, 173, 168, 163, 158, 153, 148, 129, 104 } |
| }; |
| |
| static const uint8_t celt_static_caps[4][2][21] = { |
| { // 120-sample |
| {224, 224, 224, 224, 224, 224, 224, 224, 160, 160, |
| 160, 160, 185, 185, 185, 178, 178, 168, 134, 61, 37}, |
| {224, 224, 224, 224, 224, 224, 224, 224, 240, 240, |
| 240, 240, 207, 207, 207, 198, 198, 183, 144, 66, 40}, |
| }, { // 240-sample |
| {160, 160, 160, 160, 160, 160, 160, 160, 185, 185, |
| 185, 185, 193, 193, 193, 183, 183, 172, 138, 64, 38}, |
| {240, 240, 240, 240, 240, 240, 240, 240, 207, 207, |
| 207, 207, 204, 204, 204, 193, 193, 180, 143, 66, 40}, |
| }, { // 480-sample |
| {185, 185, 185, 185, 185, 185, 185, 185, 193, 193, |
| 193, 193, 193, 193, 193, 183, 183, 172, 138, 65, 39}, |
| {207, 207, 207, 207, 207, 207, 207, 207, 204, 204, |
| 204, 204, 201, 201, 201, 188, 188, 176, 141, 66, 40}, |
| }, { // 960-sample |
| {193, 193, 193, 193, 193, 193, 193, 193, 193, 193, |
| 193, 193, 194, 194, 194, 184, 184, 173, 139, 65, 39}, |
| {204, 204, 204, 204, 204, 204, 204, 204, 201, 201, |
| 201, 201, 198, 198, 198, 187, 187, 175, 140, 66, 40} |
| } |
| }; |
| |
| static const uint8_t celt_cache_bits[392] = { |
| 40, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, |
| 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, |
| 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 40, 15, 23, 28, |
| 31, 34, 36, 38, 39, 41, 42, 43, 44, 45, 46, 47, 47, 49, 50, |
| 51, 52, 53, 54, 55, 55, 57, 58, 59, 60, 61, 62, 63, 63, 65, |
| 66, 67, 68, 69, 70, 71, 71, 40, 20, 33, 41, 48, 53, 57, 61, |
| 64, 66, 69, 71, 73, 75, 76, 78, 80, 82, 85, 87, 89, 91, 92, |
| 94, 96, 98, 101, 103, 105, 107, 108, 110, 112, 114, 117, 119, 121, 123, |
| 124, 126, 128, 40, 23, 39, 51, 60, 67, 73, 79, 83, 87, 91, 94, |
| 97, 100, 102, 105, 107, 111, 115, 118, 121, 124, 126, 129, 131, 135, 139, |
| 142, 145, 148, 150, 153, 155, 159, 163, 166, 169, 172, 174, 177, 179, 35, |
| 28, 49, 65, 78, 89, 99, 107, 114, 120, 126, 132, 136, 141, 145, 149, |
| 153, 159, 165, 171, 176, 180, 185, 189, 192, 199, 205, 211, 216, 220, 225, |
| 229, 232, 239, 245, 251, 21, 33, 58, 79, 97, 112, 125, 137, 148, 157, |
| 166, 174, 182, 189, 195, 201, 207, 217, 227, 235, 243, 251, 17, 35, 63, |
| 86, 106, 123, 139, 152, 165, 177, 187, 197, 206, 214, 222, 230, 237, 250, |
| 25, 31, 55, 75, 91, 105, 117, 128, 138, 146, 154, 161, 168, 174, 180, |
| 185, 190, 200, 208, 215, 222, 229, 235, 240, 245, 255, 16, 36, 65, 89, |
| 110, 128, 144, 159, 173, 185, 196, 207, 217, 226, 234, 242, 250, 11, 41, |
| 74, 103, 128, 151, 172, 191, 209, 225, 241, 255, 9, 43, 79, 110, 138, |
| 163, 186, 207, 227, 246, 12, 39, 71, 99, 123, 144, 164, 182, 198, 214, |
| 228, 241, 253, 9, 44, 81, 113, 142, 168, 192, 214, 235, 255, 7, 49, |
| 90, 127, 160, 191, 220, 247, 6, 51, 95, 134, 170, 203, 234, 7, 47, |
| 87, 123, 155, 184, 212, 237, 6, 52, 97, 137, 174, 208, 240, 5, 57, |
| 106, 151, 192, 231, 5, 59, 111, 158, 202, 243, 5, 55, 103, 147, 187, |
| 224, 5, 60, 113, 161, 206, 248, 4, 65, 122, 175, 224, 4, 67, 127, |
| 182, 234 |
| }; |
| |
| static const int16_t celt_cache_index[105] = { |
| -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 41, 41, 41, |
| 82, 82, 123, 164, 200, 222, 0, 0, 0, 0, 0, 0, 0, 0, 41, |
| 41, 41, 41, 123, 123, 123, 164, 164, 240, 266, 283, 295, 41, 41, 41, |
| 41, 41, 41, 41, 41, 123, 123, 123, 123, 240, 240, 240, 266, 266, 305, |
| 318, 328, 336, 123, 123, 123, 123, 123, 123, 123, 123, 240, 240, 240, 240, |
| 305, 305, 305, 318, 318, 343, 351, 358, 364, 240, 240, 240, 240, 240, 240, |
| 240, 240, 305, 305, 305, 305, 343, 343, 343, 351, 351, 370, 376, 382, 387, |
| }; |
| |
| static const uint8_t celt_log2_frac[] = { |
| 0, 8, 13, 16, 19, 21, 23, 24, 26, 27, 28, 29, 30, 31, 32, 32, 33, 34, 34, 35, 36, 36, 37, 37 |
| }; |
| |
| static const uint8_t celt_bit_interleave[] = { |
| 0, 1, 1, 1, 2, 3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3 |
| }; |
| |
| static const uint8_t celt_bit_deinterleave[] = { |
| 0x00, 0x03, 0x0C, 0x0F, 0x30, 0x33, 0x3C, 0x3F, |
| 0xC0, 0xC3, 0xCC, 0xCF, 0xF0, 0xF3, 0xFC, 0xFF |
| }; |
| |
| static const uint8_t celt_hadamard_ordery[] = { |
| 1, 0, |
| 3, 0, 2, 1, |
| 7, 0, 4, 3, 6, 1, 5, 2, |
| 15, 0, 8, 7, 12, 3, 11, 4, 14, 1, 9, 6, 13, 2, 10, 5 |
| }; |
| |
| static const uint16_t celt_qn_exp2[] = { |
| 16384, 17866, 19483, 21247, 23170, 25267, 27554, 30048 |
| }; |
| |
| static const uint32_t celt_pvq_u[1272] = { |
| /* N = 0, K = 0...176 */ |
| 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| /* N = 1, K = 1...176 */ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, |
| /* N = 2, K = 2...176 */ |
| 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, |
| 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, |
| 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109, 111, 113, |
| 115, 117, 119, 121, 123, 125, 127, 129, 131, 133, 135, 137, 139, 141, 143, |
| 145, 147, 149, 151, 153, 155, 157, 159, 161, 163, 165, 167, 169, 171, 173, |
| 175, 177, 179, 181, 183, 185, 187, 189, 191, 193, 195, 197, 199, 201, 203, |
| 205, 207, 209, 211, 213, 215, 217, 219, 221, 223, 225, 227, 229, 231, 233, |
| 235, 237, 239, 241, 243, 245, 247, 249, 251, 253, 255, 257, 259, 261, 263, |
| 265, 267, 269, 271, 273, 275, 277, 279, 281, 283, 285, 287, 289, 291, 293, |
| 295, 297, 299, 301, 303, 305, 307, 309, 311, 313, 315, 317, 319, 321, 323, |
| 325, 327, 329, 331, 333, 335, 337, 339, 341, 343, 345, 347, 349, 351, |
| /* N = 3, K = 3...176 */ |
| 13, 25, 41, 61, 85, 113, 145, 181, 221, 265, 313, 365, 421, 481, 545, 613, |
| 685, 761, 841, 925, 1013, 1105, 1201, 1301, 1405, 1513, 1625, 1741, 1861, |
| 1985, 2113, 2245, 2381, 2521, 2665, 2813, 2965, 3121, 3281, 3445, 3613, 3785, |
| 3961, 4141, 4325, 4513, 4705, 4901, 5101, 5305, 5513, 5725, 5941, 6161, 6385, |
| 6613, 6845, 7081, 7321, 7565, 7813, 8065, 8321, 8581, 8845, 9113, 9385, 9661, |
| 9941, 10225, 10513, 10805, 11101, 11401, 11705, 12013, 12325, 12641, 12961, |
| 13285, 13613, 13945, 14281, 14621, 14965, 15313, 15665, 16021, 16381, 16745, |
| 17113, 17485, 17861, 18241, 18625, 19013, 19405, 19801, 20201, 20605, 21013, |
| 21425, 21841, 22261, 22685, 23113, 23545, 23981, 24421, 24865, 25313, 25765, |
| 26221, 26681, 27145, 27613, 28085, 28561, 29041, 29525, 30013, 30505, 31001, |
| 31501, 32005, 32513, 33025, 33541, 34061, 34585, 35113, 35645, 36181, 36721, |
| 37265, 37813, 38365, 38921, 39481, 40045, 40613, 41185, 41761, 42341, 42925, |
| 43513, 44105, 44701, 45301, 45905, 46513, 47125, 47741, 48361, 48985, 49613, |
| 50245, 50881, 51521, 52165, 52813, 53465, 54121, 54781, 55445, 56113, 56785, |
| 57461, 58141, 58825, 59513, 60205, 60901, 61601, |
| /* N = 4, K = 4...176 */ |
| 63, 129, 231, 377, 575, 833, 1159, 1561, 2047, 2625, 3303, 4089, 4991, 6017, |
| 7175, 8473, 9919, 11521, 13287, 15225, 17343, 19649, 22151, 24857, 27775, |
| 30913, 34279, 37881, 41727, 45825, 50183, 54809, 59711, 64897, 70375, 76153, |
| 82239, 88641, 95367, 102425, 109823, 117569, 125671, 134137, 142975, 152193, |
| 161799, 171801, 182207, 193025, 204263, 215929, 228031, 240577, 253575, |
| 267033, 280959, 295361, 310247, 325625, 341503, 357889, 374791, 392217, |
| 410175, 428673, 447719, 467321, 487487, 508225, 529543, 551449, 573951, |
| 597057, 620775, 645113, 670079, 695681, 721927, 748825, 776383, 804609, |
| 833511, 863097, 893375, 924353, 956039, 988441, 1021567, 1055425, 1090023, |
| 1125369, 1161471, 1198337, 1235975, 1274393, 1313599, 1353601, 1394407, |
| 1436025, 1478463, 1521729, 1565831, 1610777, 1656575, 1703233, 1750759, |
| 1799161, 1848447, 1898625, 1949703, 2001689, 2054591, 2108417, 2163175, |
| 2218873, 2275519, 2333121, 2391687, 2451225, 2511743, 2573249, 2635751, |
| 2699257, 2763775, 2829313, 2895879, 2963481, 3032127, 3101825, 3172583, |
| 3244409, 3317311, 3391297, 3466375, 3542553, 3619839, 3698241, 3777767, |
| 3858425, 3940223, 4023169, 4107271, 4192537, 4278975, 4366593, 4455399, |
| 4545401, 4636607, 4729025, 4822663, 4917529, 5013631, 5110977, 5209575, |
| 5309433, 5410559, 5512961, 5616647, 5721625, 5827903, 5935489, 6044391, |
| 6154617, 6266175, 6379073, 6493319, 6608921, 6725887, 6844225, 6963943, |
| 7085049, 7207551, |
| /* N = 5, K = 5...176 */ |
| 321, 681, 1289, 2241, 3649, 5641, 8361, 11969, 16641, 22569, 29961, 39041, |
| 50049, 63241, 78889, 97281, 118721, 143529, 172041, 204609, 241601, 283401, |
| 330409, 383041, 441729, 506921, 579081, 658689, 746241, 842249, 947241, |
| 1061761, 1186369, 1321641, 1468169, 1626561, 1797441, 1981449, 2179241, |
| 2391489, 2618881, 2862121, 3121929, 3399041, 3694209, 4008201, 4341801, |
| 4695809, 5071041, 5468329, 5888521, 6332481, 6801089, 7295241, 7815849, |
| 8363841, 8940161, 9545769, 10181641, 10848769, 11548161, 12280841, 13047849, |
| 13850241, 14689089, 15565481, 16480521, 17435329, 18431041, 19468809, |
| 20549801, 21675201, 22846209, 24064041, 25329929, 26645121, 28010881, |
| 29428489, 30899241, 32424449, 34005441, 35643561, 37340169, 39096641, |
| 40914369, 42794761, 44739241, 46749249, 48826241, 50971689, 53187081, |
| 55473921, 57833729, 60268041, 62778409, 65366401, 68033601, 70781609, |
| 73612041, 76526529, 79526721, 82614281, 85790889, 89058241, 92418049, |
| 95872041, 99421961, 103069569, 106816641, 110664969, 114616361, 118672641, |
| 122835649, 127107241, 131489289, 135983681, 140592321, 145317129, 150160041, |
| 155123009, 160208001, 165417001, 170752009, 176215041, 181808129, 187533321, |
| 193392681, 199388289, 205522241, 211796649, 218213641, 224775361, 231483969, |
| 238341641, 245350569, 252512961, 259831041, 267307049, 274943241, 282741889, |
| 290705281, 298835721, 307135529, 315607041, 324252609, 333074601, 342075401, |
| 351257409, 360623041, 370174729, 379914921, 389846081, 399970689, 410291241, |
| 420810249, 431530241, 442453761, 453583369, 464921641, 476471169, 488234561, |
| 500214441, 512413449, 524834241, 537479489, 550351881, 563454121, 576788929, |
| 590359041, 604167209, 618216201, 632508801, |
| /* N = 6, K = 6...96 (technically V(109,5) fits in 32 bits, but that can't be |
| achieved by splitting an Opus band) */ |
| 1683, 3653, 7183, 13073, 22363, 36365, 56695, 85305, 124515, 177045, 246047, |
| 335137, 448427, 590557, 766727, 982729, 1244979, 1560549, 1937199, 2383409, |
| 2908411, 3522221, 4235671, 5060441, 6009091, 7095093, 8332863, 9737793, |
| 11326283, 13115773, 15124775, 17372905, 19880915, 22670725, 25765455, |
| 29189457, 32968347, 37129037, 41699767, 46710137, 52191139, 58175189, |
| 64696159, 71789409, 79491819, 87841821, 96879431, 106646281, 117185651, |
| 128542501, 140763503, 153897073, 167993403, 183104493, 199284183, 216588185, |
| 235074115, 254801525, 275831935, 298228865, 322057867, 347386557, 374284647, |
| 402823977, 433078547, 465124549, 499040399, 534906769, 572806619, 612825229, |
| 655050231, 699571641, 746481891, 795875861, 847850911, 902506913, 959946283, |
| 1020274013, 1083597703, 1150027593, 1219676595, 1292660325, 1369097135, |
| 1449108145, 1532817275, 1620351277, 1711839767, 1807415257, 1907213187, |
| 2011371957, 2120032959, |
| /* N = 7, K = 7...54 (technically V(60,6) fits in 32 bits, but that can't be |
| achieved by splitting an Opus band) */ |
| 8989, 19825, 40081, 75517, 134245, 227305, 369305, 579125, 880685, 1303777, |
| 1884961, 2668525, 3707509, 5064793, 6814249, 9041957, 11847485, 15345233, |
| 19665841, 24957661, 31388293, 39146185, 48442297, 59511829, 72616013, |
| 88043969, 106114625, 127178701, 151620757, 179861305, 212358985, 249612805, |
| 292164445, 340600625, 395555537, 457713341, 527810725, 606639529, 695049433, |
| 793950709, 904317037, 1027188385, 1163673953, 1314955181, 1482288821, |
| 1667010073, 1870535785, 2094367717, |
| /* N = 8, K = 8...37 (technically V(40,7) fits in 32 bits, but that can't be |
| achieved by splitting an Opus band) */ |
| 48639, 108545, 224143, 433905, 795455, 1392065, 2340495, 3800305, 5984767, |
| 9173505, 13726991, 20103025, 28875327, 40754369, 56610575, 77500017, |
| 104692735, 139703809, 184327311, 240673265, 311207743, 398796225, 506750351, |
| 638878193, 799538175, 993696769, 1226990095, 1505789553, 1837271615, |
| 2229491905, |
| /* N = 9, K = 9...28 (technically V(29,8) fits in 32 bits, but that can't be |
| achieved by splitting an Opus band) */ |
| 265729, 598417, 1256465, 2485825, 4673345, 8405905, 14546705, 24331777, |
| 39490049, 62390545, 96220561, 145198913, 214828609, 312193553, 446304145, |
| 628496897, 872893441, 1196924561, 1621925137, 2173806145, |
| /* N = 10, K = 10...24 */ |
| 1462563, 3317445, 7059735, 14218905, 27298155, 50250765, 89129247, 152951073, |
| 254831667, 413442773, 654862247, 1014889769, 1541911931, 2300409629, |
| 3375210671, |
| /* N = 11, K = 11...19 (technically V(20,10) fits in 32 bits, but that can't be |
| achieved by splitting an Opus band) */ |
| 8097453, 18474633, 39753273, 81270333, 158819253, 298199265, 540279585, |
| 948062325, 1616336765, |
| /* N = 12, K = 12...18 */ |
| 45046719, 103274625, 224298231, 464387817, 921406335, 1759885185, |
| 3248227095, |
| /* N = 13, K = 13...16 */ |
| 251595969, 579168825, 1267854873, 2653649025, |
| /* N = 14, K = 14 */ |
| 1409933619 |
| }; |
| |
| DECLARE_ALIGNED(32, static const float, celt_window)[120] = { |
| 6.7286966e-05f, 0.00060551348f, 0.0016815970f, 0.0032947962f, 0.0054439943f, |
| 0.0081276923f, 0.011344001f, 0.015090633f, 0.019364886f, 0.024163635f, |
| 0.029483315f, 0.035319905f, 0.041668911f, 0.048525347f, 0.055883718f, |
| 0.063737999f, 0.072081616f, 0.080907428f, 0.090207705f, 0.099974111f, |
| 0.11019769f, 0.12086883f, 0.13197729f, 0.14351214f, 0.15546177f, |
| 0.16781389f, 0.18055550f, 0.19367290f, 0.20715171f, 0.22097682f, |
| 0.23513243f, 0.24960208f, 0.26436860f, 0.27941419f, 0.29472040f, |
| 0.31026818f, 0.32603788f, 0.34200931f, 0.35816177f, 0.37447407f, |
| 0.39092462f, 0.40749142f, 0.42415215f, 0.44088423f, 0.45766484f, |
| 0.47447104f, 0.49127978f, 0.50806798f, 0.52481261f, 0.54149077f, |
| 0.55807973f, 0.57455701f, 0.59090049f, 0.60708841f, 0.62309951f, |
| 0.63891306f, 0.65450896f, 0.66986776f, 0.68497077f, 0.69980010f, |
| 0.71433873f, 0.72857055f, 0.74248043f, 0.75605424f, 0.76927895f, |
| 0.78214257f, 0.79463430f, 0.80674445f, 0.81846456f, 0.82978733f, |
| 0.84070669f, 0.85121779f, 0.86131698f, 0.87100183f, 0.88027111f, |
| 0.88912479f, 0.89756398f, 0.90559094f, 0.91320904f, 0.92042270f, |
| 0.92723738f, 0.93365955f, 0.93969656f, 0.94535671f, 0.95064907f, |
| 0.95558353f, 0.96017067f, 0.96442171f, 0.96834849f, 0.97196334f, |
| 0.97527906f, 0.97830883f, 0.98106616f, 0.98356480f, 0.98581869f, |
| 0.98784191f, 0.98964856f, 0.99125274f, 0.99266849f, 0.99390969f, |
| 0.99499004f, 0.99592297f, 0.99672162f, 0.99739874f, 0.99796667f, |
| 0.99843728f, 0.99882195f, 0.99913147f, 0.99937606f, 0.99956527f, |
| 0.99970802f, 0.99981248f, 0.99988613f, 0.99993565f, 0.99996697f, |
| 0.99998518f, 0.99999457f, 0.99999859f, 0.99999982f, 1.0000000f, |
| }; |
| |
| /* square of the window, used for the postfilter */ |
| const float ff_celt_window2[120] = { |
| 4.5275357e-09f, 3.66647e-07f, 2.82777e-06f, 1.08557e-05f, 2.96371e-05f, 6.60594e-05f, |
| 0.000128686f, 0.000227727f, 0.000374999f, 0.000583881f, 0.000869266f, 0.0012475f, |
| 0.0017363f, 0.00235471f, 0.00312299f, 0.00406253f, 0.00519576f, 0.00654601f, |
| 0.00813743f, 0.00999482f, 0.0121435f, 0.0146093f, 0.017418f, 0.0205957f, 0.0241684f, |
| 0.0281615f, 0.0326003f, 0.0375092f, 0.0429118f, 0.0488308f, 0.0552873f, 0.0623012f, |
| 0.0698908f, 0.0780723f, 0.0868601f, 0.0962664f, 0.106301f, 0.11697f, 0.12828f, |
| 0.140231f, 0.152822f, 0.166049f, 0.179905f, 0.194379f, 0.209457f, 0.225123f, 0.241356f, |
| 0.258133f, 0.275428f, 0.293212f, 0.311453f, 0.330116f, 0.349163f, 0.368556f, 0.388253f, |
| 0.40821f, 0.428382f, 0.448723f, 0.469185f, 0.48972f, 0.51028f, 0.530815f, 0.551277f, |
| 0.571618f, 0.59179f, 0.611747f, 0.631444f, 0.650837f, 0.669884f, 0.688547f, 0.706788f, |
| 0.724572f, 0.741867f, 0.758644f, 0.774877f, 0.790543f, 0.805621f, 0.820095f, 0.833951f, |
| 0.847178f, 0.859769f, 0.87172f, 0.88303f, 0.893699f, 0.903734f, 0.91314f, 0.921928f, |
| 0.930109f, 0.937699f, 0.944713f, 0.951169f, 0.957088f, 0.962491f, 0.9674f, 0.971838f, |
| 0.975832f, 0.979404f, 0.982582f, 0.985391f, 0.987857f, 0.990005f, 0.991863f, 0.993454f, |
| 0.994804f, 0.995937f, 0.996877f, 0.997645f, 0.998264f, 0.998753f, 0.999131f, 0.999416f, |
| 0.999625f, 0.999772f, 0.999871f, 0.999934f, 0.99997f, 0.999989f, 0.999997f, 0.99999964f, 1.0f, |
| }; |
| |
| static const uint32_t * const celt_pvq_u_row[15] = { |
| celt_pvq_u + 0, celt_pvq_u + 176, celt_pvq_u + 351, |
| celt_pvq_u + 525, celt_pvq_u + 698, celt_pvq_u + 870, |
| celt_pvq_u + 1041, celt_pvq_u + 1131, celt_pvq_u + 1178, |
| celt_pvq_u + 1207, celt_pvq_u + 1226, celt_pvq_u + 1240, |
| celt_pvq_u + 1248, celt_pvq_u + 1254, celt_pvq_u + 1257 |
| }; |
| |
| static inline int16_t celt_cos(int16_t x) |
| { |
| x = (MUL16(x, x) + 4096) >> 13; |
| x = (32767-x) + ROUND_MUL16(x, (-7651 + ROUND_MUL16(x, (8277 + ROUND_MUL16(-626, x))))); |
| return 1+x; |
| } |
| |
| static inline int celt_log2tan(int isin, int icos) |
| { |
| int lc, ls; |
| lc = opus_ilog(icos); |
| ls = opus_ilog(isin); |
| icos <<= 15 - lc; |
| isin <<= 15 - ls; |
| return (ls << 11) - (lc << 11) + |
| ROUND_MUL16(isin, ROUND_MUL16(isin, -2597) + 7932) - |
| ROUND_MUL16(icos, ROUND_MUL16(icos, -2597) + 7932); |
| } |
| |
| static inline uint32_t celt_rng(CeltContext *s) |
| { |
| s->seed = 1664525 * s->seed + 1013904223; |
| return s->seed; |
| } |
| |
| static void celt_decode_coarse_energy(CeltContext *s, OpusRangeCoder *rc) |
| { |
| int i, j; |
| float prev[2] = {0}; |
| float alpha, beta; |
| const uint8_t *model; |
| |
| /* use the 2D z-transform to apply prediction in both */ |
| /* the time domain (alpha) and the frequency domain (beta) */ |
| |
| if (opus_rc_tell(rc)+3 <= s->framebits && opus_rc_p2model(rc, 3)) { |
| /* intra frame */ |
| alpha = 0; |
| beta = 1.0f - 4915.0f/32768.0f; |
| model = celt_coarse_energy_dist[s->duration][1]; |
| } else { |
| alpha = celt_alpha_coef[s->duration]; |
| beta = 1.0f - celt_beta_coef[s->duration]; |
| model = celt_coarse_energy_dist[s->duration][0]; |
| } |
| |
| for (i = 0; i < CELT_MAX_BANDS; i++) { |
| for (j = 0; j < s->coded_channels; j++) { |
| CeltFrame *frame = &s->frame[j]; |
| float value; |
| int available; |
| |
| if (i < s->startband || i >= s->endband) { |
| frame->energy[i] = 0.0; |
| continue; |
| } |
| |
| available = s->framebits - opus_rc_tell(rc); |
| if (available >= 15) { |
| /* decode using a Laplace distribution */ |
| int k = FFMIN(i, 20) << 1; |
| value = opus_rc_laplace(rc, model[k] << 7, model[k+1] << 6); |
| } else if (available >= 2) { |
| int x = opus_rc_getsymbol(rc, celt_model_energy_small); |
| value = (x>>1) ^ -(x&1); |
| } else if (available >= 1) { |
| value = -(float)opus_rc_p2model(rc, 1); |
| } else value = -1; |
| |
| frame->energy[i] = FFMAX(-9.0f, frame->energy[i]) * alpha + prev[j] + value; |
| prev[j] += beta * value; |
| } |
| } |
| } |
| |
| static void celt_decode_fine_energy(CeltContext *s, OpusRangeCoder *rc) |
| { |
| int i; |
| for (i = s->startband; i < s->endband; i++) { |
| int j; |
| if (!s->fine_bits[i]) |
| continue; |
| |
| for (j = 0; j < s->coded_channels; j++) { |
| CeltFrame *frame = &s->frame[j]; |
| int q2; |
| float offset; |
| q2 = opus_getrawbits(rc, s->fine_bits[i]); |
| offset = (q2 + 0.5f) * (1 << (14 - s->fine_bits[i])) / 16384.0f - 0.5f; |
| frame->energy[i] += offset; |
| } |
| } |
| } |
| |
| static void celt_decode_final_energy(CeltContext *s, OpusRangeCoder *rc, |
| int bits_left) |
| { |
| int priority, i, j; |
| |
| for (priority = 0; priority < 2; priority++) { |
| for (i = s->startband; i < s->endband && bits_left >= s->coded_channels; i++) { |
| if (s->fine_priority[i] != priority || s->fine_bits[i] >= CELT_MAX_FINE_BITS) |
| continue; |
| |
| for (j = 0; j < s->coded_channels; j++) { |
| int q2; |
| float offset; |
| q2 = opus_getrawbits(rc, 1); |
| offset = (q2 - 0.5f) * (1 << (14 - s->fine_bits[i] - 1)) / 16384.0f; |
| s->frame[j].energy[i] += offset; |
| bits_left--; |
| } |
| } |
| } |
| } |
| |
| static void celt_decode_tf_changes(CeltContext *s, OpusRangeCoder *rc, |
| int transient) |
| { |
| int i, diff = 0, tf_select = 0, tf_changed = 0, tf_select_bit; |
| int consumed, bits = transient ? 2 : 4; |
| |
| consumed = opus_rc_tell(rc); |
| tf_select_bit = (s->duration != 0 && consumed+bits+1 <= s->framebits); |
| |
| for (i = s->startband; i < s->endband; i++) { |
| if (consumed+bits+tf_select_bit <= s->framebits) { |
| diff ^= opus_rc_p2model(rc, bits); |
| consumed = opus_rc_tell(rc); |
| tf_changed |= diff; |
| } |
| s->tf_change[i] = diff; |
| bits = transient ? 4 : 5; |
| } |
| |
| if (tf_select_bit && celt_tf_select[s->duration][transient][0][tf_changed] != |
| celt_tf_select[s->duration][transient][1][tf_changed]) |
| tf_select = opus_rc_p2model(rc, 1); |
| |
| for (i = s->startband; i < s->endband; i++) { |
| s->tf_change[i] = celt_tf_select[s->duration][transient][tf_select][s->tf_change[i]]; |
| } |
| } |
| |
| static void celt_decode_allocation(CeltContext *s, OpusRangeCoder *rc) |
| { |
| // approx. maximum bit allocation for each band before boost/trim |
| int cap[CELT_MAX_BANDS]; |
| int boost[CELT_MAX_BANDS]; |
| int threshold[CELT_MAX_BANDS]; |
| int bits1[CELT_MAX_BANDS]; |
| int bits2[CELT_MAX_BANDS]; |
| int trim_offset[CELT_MAX_BANDS]; |
| |
| int skip_startband = s->startband; |
| int dynalloc = 6; |
| int alloctrim = 5; |
| int extrabits = 0; |
| |
| int skip_bit = 0; |
| int intensitystereo_bit = 0; |
| int dualstereo_bit = 0; |
| |
| int remaining, bandbits; |
| int low, high, total, done; |
| int totalbits; |
| int consumed; |
| int i, j; |
| |
| consumed = opus_rc_tell(rc); |
| |
| /* obtain spread flag */ |
| s->spread = CELT_SPREAD_NORMAL; |
| if (consumed + 4 <= s->framebits) |
| s->spread = opus_rc_getsymbol(rc, celt_model_spread); |
| |
| /* generate static allocation caps */ |
| for (i = 0; i < CELT_MAX_BANDS; i++) { |
| cap[i] = (celt_static_caps[s->duration][s->coded_channels - 1][i] + 64) |
| * celt_freq_range[i] << (s->coded_channels - 1) << s->duration >> 2; |
| } |
| |
| /* obtain band boost */ |
| totalbits = s->framebits << 3; // convert to 1/8 bits |
| consumed = opus_rc_tell_frac(rc); |
| for (i = s->startband; i < s->endband; i++) { |
| int quanta, band_dynalloc; |
| |
| boost[i] = 0; |
| |
| quanta = celt_freq_range[i] << (s->coded_channels - 1) << s->duration; |
| quanta = FFMIN(quanta << 3, FFMAX(6 << 3, quanta)); |
| band_dynalloc = dynalloc; |
| while (consumed + (band_dynalloc<<3) < totalbits && boost[i] < cap[i]) { |
| int add = opus_rc_p2model(rc, band_dynalloc); |
| consumed = opus_rc_tell_frac(rc); |
| if (!add) |
| break; |
| |
| boost[i] += quanta; |
| totalbits -= quanta; |
| band_dynalloc = 1; |
| } |
| /* dynalloc is more likely to occur if it's already been used for earlier bands */ |
| if (boost[i]) |
| dynalloc = FFMAX(2, dynalloc - 1); |
| } |
| |
| /* obtain allocation trim */ |
| if (consumed + (6 << 3) <= totalbits) |
| alloctrim = opus_rc_getsymbol(rc, celt_model_alloc_trim); |
| |
| /* anti-collapse bit reservation */ |
| totalbits = (s->framebits << 3) - opus_rc_tell_frac(rc) - 1; |
| s->anticollapse_bit = 0; |
| if (s->blocks > 1 && s->duration >= 2 && |
| totalbits >= ((s->duration + 2) << 3)) |
| s->anticollapse_bit = 1 << 3; |
| totalbits -= s->anticollapse_bit; |
| |
| /* band skip bit reservation */ |
| if (totalbits >= 1 << 3) |
| skip_bit = 1 << 3; |
| totalbits -= skip_bit; |
| |
| /* intensity/dual stereo bit reservation */ |
| if (s->coded_channels == 2) { |
| intensitystereo_bit = celt_log2_frac[s->endband - s->startband]; |
| if (intensitystereo_bit <= totalbits) { |
| totalbits -= intensitystereo_bit; |
| if (totalbits >= 1 << 3) { |
| dualstereo_bit = 1 << 3; |
| totalbits -= 1 << 3; |
| } |
| } else |
| intensitystereo_bit = 0; |
| } |
| |
| for (i = s->startband; i < s->endband; i++) { |
| int trim = alloctrim - 5 - s->duration; |
| int band = celt_freq_range[i] * (s->endband - i - 1); |
| int duration = s->duration + 3; |
| int scale = duration + s->coded_channels - 1; |
| |
| /* PVQ minimum allocation threshold, below this value the band is |
| * skipped */ |
| threshold[i] = FFMAX(3 * celt_freq_range[i] << duration >> 4, |
| s->coded_channels << 3); |
| |
| trim_offset[i] = trim * (band << scale) >> 6; |
| |
| if (celt_freq_range[i] << s->duration == 1) |
| trim_offset[i] -= s->coded_channels << 3; |
| } |
| |
| /* bisection */ |
| low = 1; |
| high = CELT_VECTORS - 1; |
| while (low <= high) { |
| int center = (low + high) >> 1; |
| done = total = 0; |
| |
| for (i = s->endband - 1; i >= s->startband; i--) { |
| bandbits = celt_freq_range[i] * celt_static_alloc[center][i] |
| << (s->coded_channels - 1) << s->duration >> 2; |
| |
| if (bandbits) |
| bandbits = FFMAX(0, bandbits + trim_offset[i]); |
| bandbits += boost[i]; |
| |
| if (bandbits >= threshold[i] || done) { |
| done = 1; |
| total += FFMIN(bandbits, cap[i]); |
| } else if (bandbits >= s->coded_channels << 3) |
| total += s->coded_channels << 3; |
| } |
| |
| if (total > totalbits) |
| high = center - 1; |
| else |
| low = center + 1; |
| } |
| high = low--; |
| |
| for (i = s->startband; i < s->endband; i++) { |
| bits1[i] = celt_freq_range[i] * celt_static_alloc[low][i] |
| << (s->coded_channels - 1) << s->duration >> 2; |
| bits2[i] = high >= CELT_VECTORS ? cap[i] : |
| celt_freq_range[i] * celt_static_alloc[high][i] |
| << (s->coded_channels - 1) << s->duration >> 2; |
| |
| if (bits1[i]) |
| bits1[i] = FFMAX(0, bits1[i] + trim_offset[i]); |
| if (bits2[i]) |
| bits2[i] = FFMAX(0, bits2[i] + trim_offset[i]); |
| if (low) |
| bits1[i] += boost[i]; |
| bits2[i] += boost[i]; |
| |
| if (boost[i]) |
| skip_startband = i; |
| bits2[i] = FFMAX(0, bits2[i] - bits1[i]); |
| } |
| |
| /* bisection */ |
| low = 0; |
| high = 1 << CELT_ALLOC_STEPS; |
| for (i = 0; i < CELT_ALLOC_STEPS; i++) { |
| int center = (low + high) >> 1; |
| done = total = 0; |
| |
| for (j = s->endband - 1; j >= s->startband; j--) { |
| bandbits = bits1[j] + (center * bits2[j] >> CELT_ALLOC_STEPS); |
| |
| if (bandbits >= threshold[j] || done) { |
| done = 1; |
| total += FFMIN(bandbits, cap[j]); |
| } else if (bandbits >= s->coded_channels << 3) |
| total += s->coded_channels << 3; |
| } |
| if (total > totalbits) |
| high = center; |
| else |
| low = center; |
| } |
| |
| done = total = 0; |
| for (i = s->endband - 1; i >= s->startband; i--) { |
| bandbits = bits1[i] + (low * bits2[i] >> CELT_ALLOC_STEPS); |
| |
| if (bandbits >= threshold[i] || done) |
| done = 1; |
| else |
| bandbits = (bandbits >= s->coded_channels << 3) ? |
| s->coded_channels << 3 : 0; |
| |
| bandbits = FFMIN(bandbits, cap[i]); |
| s->pulses[i] = bandbits; |
| total += bandbits; |
| } |
| |
| /* band skipping */ |
| for (s->codedbands = s->endband; ; s->codedbands--) { |
| int allocation; |
| j = s->codedbands - 1; |
| |
| if (j == skip_startband) { |
| /* all remaining bands are not skipped */ |
| totalbits += skip_bit; |
| break; |
| } |
| |
| /* determine the number of bits available for coding "do not skip" markers */ |
| remaining = totalbits - total; |
| bandbits = remaining / (celt_freq_bands[j+1] - celt_freq_bands[s->startband]); |
| remaining -= bandbits * (celt_freq_bands[j+1] - celt_freq_bands[s->startband]); |
| allocation = s->pulses[j] + bandbits * celt_freq_range[j] |
| + FFMAX(0, remaining - (celt_freq_bands[j] - celt_freq_bands[s->startband])); |
| |
| /* a "do not skip" marker is only coded if the allocation is |
| above the chosen threshold */ |
| if (allocation >= FFMAX(threshold[j], (s->coded_channels + 1) <<3 )) { |
| if (opus_rc_p2model(rc, 1)) |
| break; |
| |
| total += 1 << 3; |
| allocation -= 1 << 3; |
| } |
| |
| /* the band is skipped, so reclaim its bits */ |
| total -= s->pulses[j]; |
| if (intensitystereo_bit) { |
| total -= intensitystereo_bit; |
| intensitystereo_bit = celt_log2_frac[j - s->startband]; |
| total += intensitystereo_bit; |
| } |
| |
| total += s->pulses[j] = (allocation >= s->coded_channels << 3) ? |
| s->coded_channels << 3 : 0; |
| } |
| |
| /* obtain stereo flags */ |
| s->intensitystereo = 0; |
| s->dualstereo = 0; |
| if (intensitystereo_bit) |
| s->intensitystereo = s->startband + |
| opus_rc_unimodel(rc, s->codedbands + 1 - s->startband); |
| if (s->intensitystereo <= s->startband) |
| totalbits += dualstereo_bit; /* no intensity stereo means no dual stereo */ |
| else if (dualstereo_bit) |
| s->dualstereo = opus_rc_p2model(rc, 1); |
| |
| /* supply the remaining bits in this frame to lower bands */ |
| remaining = totalbits - total; |
| bandbits = remaining / (celt_freq_bands[s->codedbands] - celt_freq_bands[s->startband]); |
| remaining -= bandbits * (celt_freq_bands[s->codedbands] - celt_freq_bands[s->startband]); |
| for (i = s->startband; i < s->codedbands; i++) { |
| int bits = FFMIN(remaining, celt_freq_range[i]); |
| |
| s->pulses[i] += bits + bandbits * celt_freq_range[i]; |
| remaining -= bits; |
| } |
| |
| for (i = s->startband; i < s->codedbands; i++) { |
| int N = celt_freq_range[i] << s->duration; |
| int prev_extra = extrabits; |
| s->pulses[i] += extrabits; |
| |
| if (N > 1) { |
| int dof; // degrees of freedom |
| int temp; // dof * channels * log(dof) |
| int offset; // fine energy quantization offset, i.e. |
| // extra bits assigned over the standard |
| // totalbits/dof |
| int fine_bits, max_bits; |
| |
| extrabits = FFMAX(0, s->pulses[i] - cap[i]); |
| s->pulses[i] -= extrabits; |
| |
| /* intensity stereo makes use of an extra degree of freedom */ |
| dof = N * s->coded_channels |
| + (s->coded_channels == 2 && N > 2 && !s->dualstereo && i < s->intensitystereo); |
| temp = dof * (celt_log_freq_range[i] + (s->duration<<3)); |
| offset = (temp >> 1) - dof * CELT_FINE_OFFSET; |
| if (N == 2) /* dof=2 is the only case that doesn't fit the model */ |
| offset += dof<<1; |
| |
| /* grant an additional bias for the first and second pulses */ |
| if (s->pulses[i] + offset < 2 * (dof << 3)) |
| offset += temp >> 2; |
| else if (s->pulses[i] + offset < 3 * (dof << 3)) |
| offset += temp >> 3; |
| |
| fine_bits = (s->pulses[i] + offset + (dof << 2)) / (dof << 3); |
| max_bits = FFMIN((s->pulses[i]>>3) >> (s->coded_channels - 1), |
| CELT_MAX_FINE_BITS); |
| |
| max_bits = FFMAX(max_bits, 0); |
| |
| s->fine_bits[i] = av_clip(fine_bits, 0, max_bits); |
| |
| /* if fine_bits was rounded down or capped, |
| give priority for the final fine energy pass */ |
| s->fine_priority[i] = (s->fine_bits[i] * (dof<<3) >= s->pulses[i] + offset); |
| |
| /* the remaining bits are assigned to PVQ */ |
| s->pulses[i] -= s->fine_bits[i] << (s->coded_channels - 1) << 3; |
| } else { |
| /* all bits go to fine energy except for the sign bit */ |
| extrabits = FFMAX(0, s->pulses[i] - (s->coded_channels << 3)); |
| s->pulses[i] -= extrabits; |
| s->fine_bits[i] = 0; |
| s->fine_priority[i] = 1; |
| } |
| |
| /* hand back a limited number of extra fine energy bits to this band */ |
| if (extrabits > 0) { |
| int fineextra = FFMIN(extrabits >> (s->coded_channels + 2), |
| CELT_MAX_FINE_BITS - s->fine_bits[i]); |
| s->fine_bits[i] += fineextra; |
| |
| fineextra <<= s->coded_channels + 2; |
| s->fine_priority[i] = (fineextra >= extrabits - prev_extra); |
| extrabits -= fineextra; |
| } |
| } |
| s->remaining = extrabits; |
| |
| /* skipped bands dedicate all of their bits for fine energy */ |
| for (; i < s->endband; i++) { |
| s->fine_bits[i] = s->pulses[i] >> (s->coded_channels - 1) >> 3; |
| s->pulses[i] = 0; |
| s->fine_priority[i] = s->fine_bits[i] < 1; |
| } |
| } |
| |
| static inline int celt_bits2pulses(const uint8_t *cache, int bits) |
| { |
| // TODO: Find the size of cache and make it into an array in the parameters list |
| int i, low = 0, high; |
| |
| high = cache[0]; |
| bits--; |
| |
| for (i = 0; i < 6; i++) { |
| int center = (low + high + 1) >> 1; |
| if (cache[center] >= bits) |
| high = center; |
| else |
| low = center; |
| } |
| |
| return (bits - (low == 0 ? -1 : cache[low]) <= cache[high] - bits) ? low : high; |
| } |
| |
| static inline int celt_pulses2bits(const uint8_t *cache, int pulses) |
| { |
| // TODO: Find the size of cache and make it into an array in the parameters list |
| return (pulses == 0) ? 0 : cache[pulses] + 1; |
| } |
| |
| static inline void celt_normalize_residual(const int * av_restrict iy, float * av_restrict X, |
| int N, float g) |
| { |
| int i; |
| for (i = 0; i < N; i++) |
| X[i] = g * iy[i]; |
| } |
| |
| static void celt_exp_rotation1(float *X, unsigned int len, unsigned int stride, |
| float c, float s) |
| { |
| float *Xptr; |
| int i; |
| |
| Xptr = X; |
| for (i = 0; i < len - stride; i++) { |
| float x1, x2; |
| x1 = Xptr[0]; |
| x2 = Xptr[stride]; |
| Xptr[stride] = c * x2 + s * x1; |
| *Xptr++ = c * x1 - s * x2; |
| } |
| |
| Xptr = &X[len - 2 * stride - 1]; |
| for (i = len - 2 * stride - 1; i >= 0; i--) { |
| float x1, x2; |
| x1 = Xptr[0]; |
| x2 = Xptr[stride]; |
| Xptr[stride] = c * x2 + s * x1; |
| *Xptr-- = c * x1 - s * x2; |
| } |
| } |
| |
| static inline void celt_exp_rotation(float *X, unsigned int len, |
| unsigned int stride, unsigned int K, |
| enum CeltSpread spread) |
| { |
| unsigned int stride2 = 0; |
| float c, s; |
| float gain, theta; |
| int i; |
| |
| if (2*K >= len || spread == CELT_SPREAD_NONE) |
| return; |
| |
| gain = (float)len / (len + (20 - 5*spread) * K); |
| theta = M_PI * gain * gain / 4; |
| |
| c = cos(theta); |
| s = sin(theta); |
| |
| if (len >= stride << 3) { |
| stride2 = 1; |
| /* This is just a simple (equivalent) way of computing sqrt(len/stride) with rounding. |
| It's basically incrementing long as (stride2+0.5)^2 < len/stride. */ |
| while ((stride2 * stride2 + stride2) * stride + (stride >> 2) < len) |
| stride2++; |
| } |
| |
| /*NOTE: As a minor optimization, we could be passing around log2(B), not B, for both this and for |
| extract_collapse_mask().*/ |
| len /= stride; |
| for (i = 0; i < stride; i++) { |
| if (stride2) |
| celt_exp_rotation1(X + i * len, len, stride2, s, c); |
| celt_exp_rotation1(X + i * len, len, 1, c, s); |
| } |
| } |
| |
| static inline unsigned int celt_extract_collapse_mask(const int *iy, |
| unsigned int N, |
| unsigned int B) |
| { |
| unsigned int collapse_mask; |
| int N0; |
| int i, j; |
| |
| if (B <= 1) |
| return 1; |
| |
| /*NOTE: As a minor optimization, we could be passing around log2(B), not B, for both this and for |
| exp_rotation().*/ |
| N0 = N/B; |
| collapse_mask = 0; |
| for (i = 0; i < B; i++) |
| for (j = 0; j < N0; j++) |
| collapse_mask |= (iy[i*N0+j]!=0)<<i; |
| return collapse_mask; |
| } |
| |
| static inline void celt_renormalize_vector(float *X, int N, float gain) |
| { |
| int i; |
| float g = 1e-15f; |
| for (i = 0; i < N; i++) |
| g += X[i] * X[i]; |
| g = gain / sqrtf(g); |
| |
| for (i = 0; i < N; i++) |
| X[i] *= g; |
| } |
| |
| static inline void celt_stereo_merge(float *X, float *Y, float mid, int N) |
| { |
| int i; |
| float xp = 0, side = 0; |
| float E[2]; |
| float mid2; |
| float t, gain[2]; |
| |
| /* Compute the norm of X+Y and X-Y as |X|^2 + |Y|^2 +/- sum(xy) */ |
| for (i = 0; i < N; i++) { |
| xp += X[i] * Y[i]; |
| side += Y[i] * Y[i]; |
| } |
| |
| /* Compensating for the mid normalization */ |
| xp *= mid; |
| mid2 = mid; |
| E[0] = mid2 * mid2 + side - 2 * xp; |
| E[1] = mid2 * mid2 + side + 2 * xp; |
| if (E[0] < 6e-4f || E[1] < 6e-4f) { |
| for (i = 0; i < N; i++) |
| Y[i] = X[i]; |
| return; |
| } |
| |
| t = E[0]; |
| gain[0] = 1.0f / sqrtf(t); |
| t = E[1]; |
| gain[1] = 1.0f / sqrtf(t); |
| |
| for (i = 0; i < N; i++) { |
| float value[2]; |
| /* Apply mid scaling (side is already scaled) */ |
| value[0] = mid * X[i]; |
| value[1] = Y[i]; |
| X[i] = gain[0] * (value[0] - value[1]); |
| Y[i] = gain[1] * (value[0] + value[1]); |
| } |
| } |
| |
| static void celt_interleave_hadamard(float *tmp, float *X, int N0, |
| int stride, int hadamard) |
| { |
| int i, j; |
| int N = N0*stride; |
| |
| if (hadamard) { |
| const uint8_t *ordery = celt_hadamard_ordery + stride - 2; |
| for (i = 0; i < stride; i++) |
| for (j = 0; j < N0; j++) |
| tmp[j*stride+i] = X[ordery[i]*N0+j]; |
| } else { |
| for (i = 0; i < stride; i++) |
| for (j = 0; j < N0; j++) |
| tmp[j*stride+i] = X[i*N0+j]; |
| } |
| |
| for (i = 0; i < N; i++) |
| X[i] = tmp[i]; |
| } |
| |
| static void celt_deinterleave_hadamard(float *tmp, float *X, int N0, |
| int stride, int hadamard) |
| { |
| int i, j; |
| int N = N0*stride; |
| |
| if (hadamard) { |
| const uint8_t *ordery = celt_hadamard_ordery + stride - 2; |
| for (i = 0; i < stride; i++) |
| for (j = 0; j < N0; j++) |
| tmp[ordery[i]*N0+j] = X[j*stride+i]; |
| } else { |
| for (i = 0; i < stride; i++) |
| for (j = 0; j < N0; j++) |
| tmp[i*N0+j] = X[j*stride+i]; |
| } |
| |
| for (i = 0; i < N; i++) |
| X[i] = tmp[i]; |
| } |
| |
| static void celt_haar1(float *X, int N0, int stride) |
| { |
| int i, j; |
| N0 >>= 1; |
| for (i = 0; i < stride; i++) { |
| for (j = 0; j < N0; j++) { |
| float x0 = X[stride * (2 * j + 0) + i]; |
| float x1 = X[stride * (2 * j + 1) + i]; |
| X[stride * (2 * j + 0) + i] = (x0 + x1) * M_SQRT1_2; |
| X[stride * (2 * j + 1) + i] = (x0 - x1) * M_SQRT1_2; |
| } |
| } |
| } |
| |
| static inline int celt_compute_qn(int N, int b, int offset, int pulse_cap, |
| int dualstereo) |
| { |
| int qn, qb; |
| int N2 = 2 * N - 1; |
| if (dualstereo && N == 2) |
| N2--; |
| |
| /* The upper limit ensures that in a stereo split with itheta==16384, we'll |
| * always have enough bits left over to code at least one pulse in the |
| * side; otherwise it would collapse, since it doesn't get folded. */ |
| qb = FFMIN3(b - pulse_cap - (4 << 3), (b + N2 * offset) / N2, 8 << 3); |
| qn = (qb < (1 << 3 >> 1)) ? 1 : ((celt_qn_exp2[qb & 0x7] >> (14 - (qb >> 3))) + 1) >> 1 << 1; |
| return qn; |
| } |
| |
| // this code was adapted from libopus |
| static inline uint64_t celt_cwrsi(unsigned int N, unsigned int K, unsigned int i, int *y) |
| { |
| uint64_t norm = 0; |
| uint32_t p; |
| int s, val; |
| int k0; |
| |
| while (N > 2) { |
| uint32_t q; |
| |
| /*Lots of pulses case:*/ |
| if (K >= N) { |
| const uint32_t *row = celt_pvq_u_row[N]; |
| |
| /* Are the pulses in this dimension negative? */ |
| p = row[K + 1]; |
| s = -(i >= p); |
| i -= p & s; |
| |
| /*Count how many pulses were placed in this dimension.*/ |
| k0 = K; |
| q = row[N]; |
| if (q > i) { |
| K = N; |
| do { |
| p = celt_pvq_u_row[--K][N]; |
| } while (p > i); |
| } else |
| for (p = row[K]; p > i; p = row[K]) |
| K--; |
| |
| i -= p; |
| val = (k0 - K + s) ^ s; |
| norm += val * val; |
| *y++ = val; |
| } else { /*Lots of dimensions case:*/ |
| /*Are there any pulses in this dimension at all?*/ |
| p = celt_pvq_u_row[K ][N]; |
| q = celt_pvq_u_row[K + 1][N]; |
| |
| if (p <= i && i < q) { |
| i -= p; |
| *y++ = 0; |
| } else { |
| /*Are the pulses in this dimension negative?*/ |
| s = -(i >= q); |
| i -= q & s; |
| |
| /*Count how many pulses were placed in this dimension.*/ |
| k0 = K; |
| do p = celt_pvq_u_row[--K][N]; |
| while (p > i); |
| |
| i -= p; |
| val = (k0 - K + s) ^ s; |
| norm += val * val; |
| *y++ = val; |
| } |
| } |
| N--; |
| } |
| |
| /* N == 2 */ |
| p = 2 * K + 1; |
| s = -(i >= p); |
| i -= p & s; |
| k0 = K; |
| K = (i + 1) / 2; |
| |
| if (K) |
| i -= 2 * K - 1; |
| |
| val = (k0 - K + s) ^ s; |
| norm += val * val; |
| *y++ = val; |
| |
| /* N==1 */ |
| s = -i; |
| val = (K + s) ^ s; |
| norm += val * val; |
| *y = val; |
| |
| return norm; |
| } |
| |
| static inline float celt_decode_pulses(OpusRangeCoder *rc, int *y, unsigned int N, unsigned int K) |
| { |
| unsigned int idx; |
| #define CELT_PVQ_U(n, k) (celt_pvq_u_row[FFMIN(n, k)][FFMAX(n, k)]) |
| #define CELT_PVQ_V(n, k) (CELT_PVQ_U(n, k) + CELT_PVQ_U(n, (k) + 1)) |
| idx = opus_rc_unimodel(rc, CELT_PVQ_V(N, K)); |
| return celt_cwrsi(N, K, idx, y); |
| } |
| |
| /** Decode pulse vector and combine the result with the pitch vector to produce |
| the final normalised signal in the current band. */ |
| static inline unsigned int celt_alg_unquant(OpusRangeCoder *rc, float *X, |
| unsigned int N, unsigned int K, |
| enum CeltSpread spread, |
| unsigned int blocks, float gain) |
| { |
| int y[176]; |
| |
| gain /= sqrtf(celt_decode_pulses(rc, y, N, K)); |
| celt_normalize_residual(y, X, N, gain); |
| celt_exp_rotation(X, N, blocks, K, spread); |
| return celt_extract_collapse_mask(y, N, blocks); |
| } |
| |
| static unsigned int celt_decode_band(CeltContext *s, OpusRangeCoder *rc, |
| const int band, float *X, float *Y, |
| int N, int b, unsigned int blocks, |
| float *lowband, int duration, |
| float *lowband_out, int level, |
| float gain, float *lowband_scratch, |
| int fill) |
| { |
| const uint8_t *cache; |
| int dualstereo, split; |
| int imid = 0, iside = 0; |
| unsigned int N0 = N; |
| int N_B; |
| int N_B0; |
| int B0 = blocks; |
| int time_divide = 0; |
| int recombine = 0; |
| int inv = 0; |
| float mid = 0, side = 0; |
| int longblocks = (B0 == 1); |
| unsigned int cm = 0; |
| |
| N_B0 = N_B = N / blocks; |
| split = dualstereo = (Y != NULL); |
| |
| if (N == 1) { |
| /* special case for one sample */ |
| int i; |
| float *x = X; |
| for (i = 0; i <= dualstereo; i++) { |
| int sign = 0; |
| if (s->remaining2 >= 1<<3) { |
| sign = opus_getrawbits(rc, 1); |
| s->remaining2 -= 1 << 3; |
| b -= 1 << 3; |
| } |
| x[0] = sign ? -1.0f : 1.0f; |
| x = Y; |
| } |
| if (lowband_out) |
| lowband_out[0] = X[0]; |
| return 1; |
| } |
| |
| if (!dualstereo && level == 0) { |
| int tf_change = s->tf_change[band]; |
| int k; |
| if (tf_change > 0) |
| recombine = tf_change; |
| /* Band recombining to increase frequency resolution */ |
| |
| if (lowband && |
| (recombine || ((N_B & 1) == 0 && tf_change < 0) || B0 > 1)) { |
| int j; |
| for (j = 0; j < N; j++) |
| lowband_scratch[j] = lowband[j]; |
| lowband = lowband_scratch; |
| } |
| |
| for (k = 0; k < recombine; k++) { |
| if (lowband) |
| celt_haar1(lowband, N >> k, 1 << k); |
| fill = celt_bit_interleave[fill & 0xF] | celt_bit_interleave[fill >> 4] << 2; |
| } |
| blocks >>= recombine; |
| N_B <<= recombine; |
| |
| /* Increasing the time resolution */ |
| while ((N_B & 1) == 0 && tf_change < 0) { |
| if (lowband) |
| celt_haar1(lowband, N_B, blocks); |
| fill |= fill << blocks; |
| blocks <<= 1; |
| N_B >>= 1; |
| time_divide++; |
| tf_change++; |
| } |
| B0 = blocks; |
| N_B0 = N_B; |
| |
| /* Reorganize the samples in time order instead of frequency order */ |
| if (B0 > 1 && lowband) |
| celt_deinterleave_hadamard(s->scratch, lowband, N_B >> recombine, |
| B0 << recombine, longblocks); |
| } |
| |
| /* If we need 1.5 more bit than we can produce, split the band in two. */ |
| cache = celt_cache_bits + |
| celt_cache_index[(duration + 1) * CELT_MAX_BANDS + band]; |
| if (!dualstereo && duration >= 0 && b > cache[cache[0]] + 12 && N > 2) { |
| N >>= 1; |
| Y = X + N; |
| split = 1; |
| duration -= 1; |
| if (blocks == 1) |
| fill = (fill & 1) | (fill << 1); |
| blocks = (blocks + 1) >> 1; |
| } |
| |
| if (split) { |
| int qn; |
| int itheta = 0; |
| int mbits, sbits, delta; |
| int qalloc; |
| int pulse_cap; |
| int offset; |
| int orig_fill; |
| int tell; |
| |
| /* Decide on the resolution to give to the split parameter theta */ |
| pulse_cap = celt_log_freq_range[band] + duration * 8; |
| offset = (pulse_cap >> 1) - (dualstereo && N == 2 ? CELT_QTHETA_OFFSET_TWOPHASE : |
| CELT_QTHETA_OFFSET); |
| qn = (dualstereo && band >= s->intensitystereo) ? 1 : |
| celt_compute_qn(N, b, offset, pulse_cap, dualstereo); |
| tell = opus_rc_tell_frac(rc); |
| if (qn != 1) { |
| /* Entropy coding of the angle. We use a uniform pdf for the |
| time split, a step for stereo, and a triangular one for the rest. */ |
| if (dualstereo && N > 2) |
| itheta = opus_rc_stepmodel(rc, qn/2); |
| else if (dualstereo || B0 > 1) |
| itheta = opus_rc_unimodel(rc, qn+1); |
| else |
| itheta = opus_rc_trimodel(rc, qn); |
| itheta = itheta * 16384 / qn; |
| /* NOTE: Renormalising X and Y *may* help fixed-point a bit at very high rate. |
| Let's do that at higher complexity */ |
| } else if (dualstereo) { |
| inv = (b > 2 << 3 && s->remaining2 > 2 << 3) ? opus_rc_p2model(rc, 2) : 0; |
| itheta = 0; |
| } |
| qalloc = opus_rc_tell_frac(rc) - tell; |
| b -= qalloc; |
| |
| orig_fill = fill; |
| if (itheta == 0) { |
| imid = 32767; |
| iside = 0; |
| fill = av_mod_uintp2(fill, blocks); |
| delta = -16384; |
| } else if (itheta == 16384) { |
| imid = 0; |
| iside = 32767; |
| fill &= ((1 << blocks) - 1) << blocks; |
| delta = 16384; |
| } else { |
| imid = celt_cos(itheta); |
| iside = celt_cos(16384-itheta); |
| /* This is the mid vs side allocation that minimizes squared error |
| in that band. */ |
| delta = ROUND_MUL16((N - 1) << 7, celt_log2tan(iside, imid)); |
| } |
| |
| mid = imid / 32768.0f; |
| side = iside / 32768.0f; |
| |
| /* This is a special case for N=2 that only works for stereo and takes |
| advantage of the fact that mid and side are orthogonal to encode |
| the side with just one bit. */ |
| if (N == 2 && dualstereo) { |
| int c; |
| int sign = 0; |
| float tmp; |
| float *x2, *y2; |
| mbits = b; |
| /* Only need one bit for the side */ |
| sbits = (itheta != 0 && itheta != 16384) ? 1 << 3 : 0; |
| mbits -= sbits; |
| c = (itheta > 8192); |
| s->remaining2 -= qalloc+sbits; |
| |
| x2 = c ? Y : X; |
| y2 = c ? X : Y; |
| if (sbits) |
| sign = opus_getrawbits(rc, 1); |
| sign = 1 - 2 * sign; |
| /* We use orig_fill here because we want to fold the side, but if |
| itheta==16384, we'll have cleared the low bits of fill. */ |
| cm = celt_decode_band(s, rc, band, x2, NULL, N, mbits, blocks, |
| lowband, duration, lowband_out, level, gain, |
| lowband_scratch, orig_fill); |
| /* We don't split N=2 bands, so cm is either 1 or 0 (for a fold-collapse), |
| and there's no need to worry about mixing with the other channel. */ |
| y2[0] = -sign * x2[1]; |
| y2[1] = sign * x2[0]; |
| X[0] *= mid; |
| X[1] *= mid; |
| Y[0] *= side; |
| Y[1] *= side; |
| tmp = X[0]; |
| X[0] = tmp - Y[0]; |
| Y[0] = tmp + Y[0]; |
| tmp = X[1]; |
| X[1] = tmp - Y[1]; |
| Y[1] = tmp + Y[1]; |
| } else { |
| /* "Normal" split code */ |
| float *next_lowband2 = NULL; |
| float *next_lowband_out1 = NULL; |
| int next_level = 0; |
| int rebalance; |
| |
| /* Give more bits to low-energy MDCTs than they would |
| * otherwise deserve */ |
| if (B0 > 1 && !dualstereo && (itheta & 0x3fff)) { |
| if (itheta > 8192) |
| /* Rough approximation for pre-echo masking */ |
| delta -= delta >> (4 - duration); |
| else |
| /* Corresponds to a forward-masking slope of |
| * 1.5 dB per 10 ms */ |
| delta = FFMIN(0, delta + (N << 3 >> (5 - duration))); |
| } |
| mbits = av_clip((b - delta) / 2, 0, b); |
| sbits = b - mbits; |
| s->remaining2 -= qalloc; |
| |
| if (lowband && !dualstereo) |
| next_lowband2 = lowband + N; /* >32-bit split case */ |
| |
| /* Only stereo needs to pass on lowband_out. |
| * Otherwise, it's handled at the end */ |
| if (dualstereo) |
| next_lowband_out1 = lowband_out; |
| else |
| next_level = level + 1; |
| |
| rebalance = s->remaining2; |
| if (mbits >= sbits) { |
| /* In stereo mode, we do not apply a scaling to the mid |
| * because we need the normalized mid for folding later */ |
| cm = celt_decode_band(s, rc, band, X, NULL, N, mbits, blocks, |
| lowband, duration, next_lowband_out1, |
| next_level, dualstereo ? 1.0f : (gain * mid), |
| lowband_scratch, fill); |
| |
| rebalance = mbits - (rebalance - s->remaining2); |
| if (rebalance > 3 << 3 && itheta != 0) |
| sbits += rebalance - (3 << 3); |
| |
| /* For a stereo split, the high bits of fill are always zero, |
| * so no folding will be done to the side. */ |
| cm |= celt_decode_band(s, rc, band, Y, NULL, N, sbits, blocks, |
| next_lowband2, duration, NULL, |
| next_level, gain * side, NULL, |
| fill >> blocks) << ((B0 >> 1) & (dualstereo - 1)); |
| } else { |
| /* For a stereo split, the high bits of fill are always zero, |
| * so no folding will be done to the side. */ |
| cm = celt_decode_band(s, rc, band, Y, NULL, N, sbits, blocks, |
| next_lowband2, duration, NULL, |
| next_level, gain * side, NULL, |
| fill >> blocks) << ((B0 >> 1) & (dualstereo - 1)); |
| |
| rebalance = sbits - (rebalance - s->remaining2); |
| if (rebalance > 3 << 3 && itheta != 16384) |
| mbits += rebalance - (3 << 3); |
| |
| /* In stereo mode, we do not apply a scaling to the mid because |
| * we need the normalized mid for folding later */ |
| cm |= celt_decode_band(s, rc, band, X, NULL, N, mbits, blocks, |
| lowband, duration, next_lowband_out1, |
| next_level, dualstereo ? 1.0f : (gain * mid), |
| lowband_scratch, fill); |
| } |
| } |
| } else { |
| /* This is the basic no-split case */ |
| unsigned int q = celt_bits2pulses(cache, b); |
| unsigned int curr_bits = celt_pulses2bits(cache, q); |
| s->remaining2 -= curr_bits; |
| |
| /* Ensures we can never bust the budget */ |
| while (s->remaining2 < 0 && q > 0) { |
| s->remaining2 += curr_bits; |
| curr_bits = celt_pulses2bits(cache, --q); |
| s->remaining2 -= curr_bits; |
| } |
| |
| if (q != 0) { |
| /* Finally do the actual quantization */ |
| cm = celt_alg_unquant(rc, X, N, (q < 8) ? q : (8 + (q & 7)) << ((q >> 3) - 1), |
| s->spread, blocks, gain); |
| } else { |
| /* If there's no pulse, fill the band anyway */ |
| int j; |
| unsigned int cm_mask = (1 << blocks) - 1; |
| fill &= cm_mask; |
| if (!fill) { |
| for (j = 0; j < N; j++) |
| X[j] = 0.0f; |
| } else { |
| if (!lowband) { |
| /* Noise */ |
| for (j = 0; j < N; j++) |
| X[j] = (((int32_t)celt_rng(s)) >> 20); |
| cm = cm_mask; |
| } else { |
| /* Folded spectrum */ |
| for (j = 0; j < N; j++) { |
| /* About 48 dB below the "normal" folding level */ |
| X[j] = lowband[j] + (((celt_rng(s)) & 0x8000) ? 1.0f / 256 : -1.0f / 256); |
| } |
| cm = fill; |
| } |
| celt_renormalize_vector(X, N, gain); |
| } |
| } |
| } |
| |
| /* This code is used by the decoder and by the resynthesis-enabled encoder */ |
| if (dualstereo) { |
| int j; |
| if (N != 2) |
| celt_stereo_merge(X, Y, mid, N); |
| if (inv) { |
| for (j = 0; j < N; j++) |
| Y[j] *= -1; |
| } |
| } else if (level == 0) { |
| int k; |
| |
| /* Undo the sample reorganization going from time order to frequency order */ |
| if (B0 > 1) |
| celt_interleave_hadamard(s->scratch, X, N_B>>recombine, |
| B0<<recombine, longblocks); |
| |
| /* Undo time-freq changes that we did earlier */ |
| N_B = N_B0; |
| blocks = B0; |
| for (k = 0; k < time_divide; k++) { |
| blocks >>= 1; |
| N_B <<= 1; |
| cm |= cm >> blocks; |
| celt_haar1(X, N_B, blocks); |
| } |
| |
| for (k = 0; k < recombine; k++) { |
| cm = celt_bit_deinterleave[cm]; |
| celt_haar1(X, N0>>k, 1<<k); |
| } |
| blocks <<= recombine; |
| |
| /* Scale output for later folding */ |
| if (lowband_out) { |
| int j; |
| float n = sqrtf(N0); |
| for (j = 0; j < N0; j++) |
| lowband_out[j] = n * X[j]; |
| } |
| cm = av_mod_uintp2(cm, blocks); |
| } |
| return cm; |
| } |
| |
| static void celt_denormalize(CeltContext *s, CeltFrame *frame, float *data) |
| { |
| int i, j; |
| |
| for (i = s->startband; i < s->endband; i++) { |
| float *dst = data + (celt_freq_bands[i] << s->duration); |
| float norm = exp2(frame->energy[i] + celt_mean_energy[i]); |
| |
| for (j = 0; j < celt_freq_range[i] << s->duration; j++) |
| dst[j] *= norm; |
| } |
| } |
| |
| static void celt_postfilter_apply_transition(CeltFrame *frame, float *data) |
| { |
| const int T0 = frame->pf_period_old; |
| const int T1 = frame->pf_period; |
| |
| float g00, g01, g02; |
| float g10, g11, g12; |
| |
| float x0, x1, x2, x3, x4; |
| |
| int i; |
| |
| if (frame->pf_gains[0] == 0.0 && |
| frame->pf_gains_old[0] == 0.0) |
| return; |
| |
| g00 = frame->pf_gains_old[0]; |
| g01 = frame->pf_gains_old[1]; |
| g02 = frame->pf_gains_old[2]; |
| g10 = frame->pf_gains[0]; |
| g11 = frame->pf_gains[1]; |
| g12 = frame->pf_gains[2]; |
| |
| x1 = data[-T1 + 1]; |
| x2 = data[-T1]; |
| x3 = data[-T1 - 1]; |
| x4 = data[-T1 - 2]; |
| |
| for (i = 0; i < CELT_OVERLAP; i++) { |
| float w = ff_celt_window2[i]; |
| x0 = data[i - T1 + 2]; |
| |
| data[i] += (1.0 - w) * g00 * data[i - T0] + |
| (1.0 - w) * g01 * (data[i - T0 - 1] + data[i - T0 + 1]) + |
| (1.0 - w) * g02 * (data[i - T0 - 2] + data[i - T0 + 2]) + |
| w * g10 * x2 + |
| w * g11 * (x1 + x3) + |
| w * g12 * (x0 + x4); |
| x4 = x3; |
| x3 = x2; |
| x2 = x1; |
| x1 = x0; |
| } |
| } |
| |
| static void celt_postfilter_apply(CeltFrame *frame, |
| float *data, int len) |
| { |
| const int T = frame->pf_period; |
| float g0, g1, g2; |
| float x0, x1, x2, x3, x4; |
| int i; |
| |
| if (frame->pf_gains[0] == 0.0 || len <= 0) |
| return; |
| |
| g0 = frame->pf_gains[0]; |
| g1 = frame->pf_gains[1]; |
| g2 = frame->pf_gains[2]; |
| |
| x4 = data[-T - 2]; |
| x3 = data[-T - 1]; |
| x2 = data[-T]; |
| x1 = data[-T + 1]; |
| |
| for (i = 0; i < len; i++) { |
| x0 = data[i - T + 2]; |
| data[i] += g0 * x2 + |
| g1 * (x1 + x3) + |
| g2 * (x0 + x4); |
| x4 = x3; |
| x3 = x2; |
| x2 = x1; |
| x1 = x0; |
| } |
| } |
| |
| static void celt_postfilter(CeltContext *s, CeltFrame *frame) |
| { |
| int len = s->blocksize * s->blocks; |
| |
| celt_postfilter_apply_transition(frame, frame->buf + 1024); |
| |
| frame->pf_period_old = frame->pf_period; |
| memcpy(frame->pf_gains_old, frame->pf_gains, sizeof(frame->pf_gains)); |
| |
| frame->pf_period = frame->pf_period_new; |
| memcpy(frame->pf_gains, frame->pf_gains_new, sizeof(frame->pf_gains)); |
| |
| if (len > CELT_OVERLAP) { |
| celt_postfilter_apply_transition(frame, frame->buf + 1024 + CELT_OVERLAP); |
| celt_postfilter_apply(frame, frame->buf + 1024 + 2 * CELT_OVERLAP, |
| len - 2 * CELT_OVERLAP); |
| |
| frame->pf_period_old = frame->pf_period; |
| memcpy(frame->pf_gains_old, frame->pf_gains, sizeof(frame->pf_gains)); |
| } |
| |
| memmove(frame->buf, frame->buf + len, (1024 + CELT_OVERLAP / 2) * sizeof(float)); |
| } |
| |
| static int parse_postfilter(CeltContext *s, OpusRangeCoder *rc, int consumed) |
| { |
| static const float postfilter_taps[3][3] = { |
| { 0.3066406250f, 0.2170410156f, 0.1296386719f }, |
| { 0.4638671875f, 0.2680664062f, 0.0 }, |
| { 0.7998046875f, 0.1000976562f, 0.0 } |
| }; |
| int i; |
| |
| memset(s->frame[0].pf_gains_new, 0, sizeof(s->frame[0].pf_gains_new)); |
| memset(s->frame[1].pf_gains_new, 0, sizeof(s->frame[1].pf_gains_new)); |
| |
| if (s->startband == 0 && consumed + 16 <= s->framebits) { |
| int has_postfilter = opus_rc_p2model(rc, 1); |
| if (has_postfilter) { |
| float gain; |
| int tapset, octave, period; |
| |
| octave = opus_rc_unimodel(rc, 6); |
| period = (16 << octave) + opus_getrawbits(rc, 4 + octave) - 1; |
| gain = 0.09375f * (opus_getrawbits(rc, 3) + 1); |
| tapset = (opus_rc_tell(rc) + 2 <= s->framebits) ? |
| opus_rc_getsymbol(rc, celt_model_tapset) : 0; |
| |
| for (i = 0; i < 2; i++) { |
| CeltFrame *frame = &s->frame[i]; |
| |
| frame->pf_period_new = FFMAX(period, CELT_POSTFILTER_MINPERIOD); |
| frame->pf_gains_new[0] = gain * postfilter_taps[tapset][0]; |
| frame->pf_gains_new[1] = gain * postfilter_taps[tapset][1]; |
| frame->pf_gains_new[2] = gain * postfilter_taps[tapset][2]; |
| } |
| } |
| |
| consumed = opus_rc_tell(rc); |
| } |
| |
| return consumed; |
| } |
| |
| static void process_anticollapse(CeltContext *s, CeltFrame *frame, float *X) |
| { |
| int i, j, k; |
| |
| for (i = s->startband; i < s->endband; i++) { |
| int renormalize = 0; |
| float *xptr; |
| float prev[2]; |
| float Ediff, r; |
| float thresh, sqrt_1; |
| int depth; |
| |
| /* depth in 1/8 bits */ |
| depth = (1 + s->pulses[i]) / (celt_freq_range[i] << s->duration); |
| thresh = exp2f(-1.0 - 0.125f * depth); |
| sqrt_1 = 1.0f / sqrtf(celt_freq_range[i] << s->duration); |
| |
| xptr = X + (celt_freq_bands[i] << s->duration); |
| |
| prev[0] = frame->prev_energy[0][i]; |
| prev[1] = frame->prev_energy[1][i]; |
| if (s->coded_channels == 1) { |
| CeltFrame *frame1 = &s->frame[1]; |
| |
| prev[0] = FFMAX(prev[0], frame1->prev_energy[0][i]); |
| prev[1] = FFMAX(prev[1], frame1->prev_energy[1][i]); |
| } |
| Ediff = frame->energy[i] - FFMIN(prev[0], prev[1]); |
| Ediff = FFMAX(0, Ediff); |
| |
| /* r needs to be multiplied by 2 or 2*sqrt(2) depending on LM because |
| short blocks don't have the same energy as long */ |
| r = exp2(1 - Ediff); |
| if (s->duration == 3) |
| r *= M_SQRT2; |
| r = FFMIN(thresh, r) * sqrt_1; |
| for (k = 0; k < 1 << s->duration; k++) { |
| /* Detect collapse */ |
| if (!(frame->collapse_masks[i] & 1 << k)) { |
| /* Fill with noise */ |
| for (j = 0; j < celt_freq_range[i]; j++) |
| xptr[(j << s->duration) + k] = (celt_rng(s) & 0x8000) ? r : -r; |
| renormalize = 1; |
| } |
| } |
| |
| /* We just added some energy, so we need to renormalize */ |
| if (renormalize) |
| celt_renormalize_vector(xptr, celt_freq_range[i] << s->duration, 1.0f); |
| } |
| } |
| |
| static void celt_decode_bands(CeltContext *s, OpusRangeCoder *rc) |
| { |
| float lowband_scratch[8 * 22]; |
| float norm[2 * 8 * 100]; |
| |
| int totalbits = (s->framebits << 3) - s->anticollapse_bit; |
| |
| int update_lowband = 1; |
| int lowband_offset = 0; |
| |
| int i, j; |
| |
| memset(s->coeffs, 0, sizeof(s->coeffs)); |
| |
| for (i = s->startband; i < s->endband; i++) { |
| int band_offset = celt_freq_bands[i] << s->duration; |
| int band_size = celt_freq_range[i] << s->duration; |
| float *X = s->coeffs[0] + band_offset; |
| float *Y = (s->coded_channels == 2) ? s->coeffs[1] + band_offset : NULL; |
| |
| int consumed = opus_rc_tell_frac(rc); |
| float *norm2 = norm + 8 * 100; |
| int effective_lowband = -1; |
| unsigned int cm[2]; |
| int b; |
| |
| /* Compute how many bits we want to allocate to this band */ |
| if (i != s->startband) |
| s->remaining -= consumed; |
| s->remaining2 = totalbits - consumed - 1; |
| if (i <= s->codedbands - 1) { |
| int curr_balance = s->remaining / FFMIN(3, s->codedbands-i); |
| b = av_clip_uintp2(FFMIN(s->remaining2 + 1, s->pulses[i] + curr_balance), 14); |
| } else |
| b = 0; |
| |
| if (celt_freq_bands[i] - celt_freq_range[i] >= celt_freq_bands[s->startband] && |
| (update_lowband || lowband_offset == 0)) |
| lowband_offset = i; |
| |
| /* Get a conservative estimate of the collapse_mask's for the bands we're |
| going to be folding from. */ |
| if (lowband_offset != 0 && (s->spread != CELT_SPREAD_AGGRESSIVE || |
| s->blocks > 1 || s->tf_change[i] < 0)) { |
| int foldstart, foldend; |
| |
| /* This ensures we never repeat spectral content within one band */ |
| effective_lowband = FFMAX(celt_freq_bands[s->startband], |
| celt_freq_bands[lowband_offset] - celt_freq_range[i]); |
| foldstart = lowband_offset; |
| while (celt_freq_bands[--foldstart] > effective_lowband); |
| foldend = lowband_offset - 1; |
| while (celt_freq_bands[++foldend] < effective_lowband + celt_freq_range[i]); |
| |
| cm[0] = cm[1] = 0; |
| for (j = foldstart; j < foldend; j++) { |
| cm[0] |= s->frame[0].collapse_masks[j]; |
| cm[1] |= s->frame[s->coded_channels - 1].collapse_masks[j]; |
| } |
| } else |
| /* Otherwise, we'll be using the LCG to fold, so all blocks will (almost |
| always) be non-zero.*/ |
| cm[0] = cm[1] = (1 << s->blocks) - 1; |
| |
| if (s->dualstereo && i == s->intensitystereo) { |
| /* Switch off dual stereo to do intensity */ |
| s->dualstereo = 0; |
| for (j = celt_freq_bands[s->startband] << s->duration; j < band_offset; j++) |
| norm[j] = (norm[j] + norm2[j]) / 2; |
| } |
| |
| if (s->dualstereo) { |
| cm[0] = celt_decode_band(s, rc, i, X, NULL, band_size, b / 2, s->blocks, |
| effective_lowband != -1 ? norm + (effective_lowband << s->duration) : NULL, s->duration, |
| norm + band_offset, 0, 1.0f, lowband_scratch, cm[0]); |
| |
| cm[1] = celt_decode_band(s, rc, i, Y, NULL, band_size, b/2, s->blocks, |
| effective_lowband != -1 ? norm2 + (effective_lowband << s->duration) : NULL, s->duration, |
| norm2 + band_offset, 0, 1.0f, lowband_scratch, cm[1]); |
| } else { |
| cm[0] = celt_decode_band(s, rc, i, X, Y, band_size, b, s->blocks, |
| effective_lowband != -1 ? norm + (effective_lowband << s->duration) : NULL, s->duration, |
| norm + band_offset, 0, 1.0f, lowband_scratch, cm[0]|cm[1]); |
| |
| cm[1] = cm[0]; |
| } |
| |
| s->frame[0].collapse_masks[i] = (uint8_t)cm[0]; |
| s->frame[s->coded_channels - 1].collapse_masks[i] = (uint8_t)cm[1]; |
| s->remaining += s->pulses[i] + consumed; |
| |
| /* Update the folding position only as long as we have 1 bit/sample depth */ |
| update_lowband = (b > band_size << 3); |
| } |
| } |
| |
| int ff_celt_decode_frame(CeltContext *s, OpusRangeCoder *rc, |
| float **output, int coded_channels, int frame_size, |
| int startband, int endband) |
| { |
| int i, j; |
| |
| int consumed; // bits of entropy consumed thus far for this frame |
| int silence = 0; |
| int transient = 0; |
| int anticollapse = 0; |
| IMDCT15Context *imdct; |
| float imdct_scale = 1.0; |
| |
| if (coded_channels != 1 && coded_channels != 2) { |
| av_log(s->avctx, AV_LOG_ERROR, "Invalid number of coded channels: %d\n", |
| coded_channels); |
| return AVERROR_INVALIDDATA; |
| } |
| if (startband < 0 || startband > endband || endband > CELT_MAX_BANDS) { |
| av_log(s->avctx, AV_LOG_ERROR, "Invalid start/end band: %d %d\n", |
| startband, endband); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| s->flushed = 0; |
| s->coded_channels = coded_channels; |
| s->startband = startband; |
| s->endband = endband; |
| s->framebits = rc->rb.bytes * 8; |
| |
| s->duration = av_log2(frame_size / CELT_SHORT_BLOCKSIZE); |
| if (s->duration > CELT_MAX_LOG_BLOCKS || |
| frame_size != CELT_SHORT_BLOCKSIZE * (1 << s->duration)) { |
| av_log(s->avctx, AV_LOG_ERROR, "Invalid CELT frame size: %d\n", |
| frame_size); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| if (!s->output_channels) |
| s->output_channels = coded_channels; |
| |
| memset(s->frame[0].collapse_masks, 0, sizeof(s->frame[0].collapse_masks)); |
| memset(s->frame[1].collapse_masks, 0, sizeof(s->frame[1].collapse_masks)); |
| |
| consumed = opus_rc_tell(rc); |
| |
| /* obtain silence flag */ |
| if (consumed >= s->framebits) |
| silence = 1; |
| else if (consumed == 1) |
| silence = opus_rc_p2model(rc, 15); |
| |
| |
| if (silence) { |
| consumed = s->framebits; |
| rc->total_read_bits += s->framebits - opus_rc_tell(rc); |
| } |
| |
| /* obtain post-filter options */ |
| consumed = parse_postfilter(s, rc, consumed); |
| |
| /* obtain transient flag */ |
| if (s->duration != 0 && consumed+3 <= s->framebits) |
| transient = opus_rc_p2model(rc, 3); |
| |
| s->blocks = transient ? 1 << s->duration : 1; |
| s->blocksize = frame_size / s->blocks; |
| |
| imdct = s->imdct[transient ? 0 : s->duration]; |
| |
| if (coded_channels == 1) { |
| for (i = 0; i < CELT_MAX_BANDS; i++) |
| s->frame[0].energy[i] = FFMAX(s->frame[0].energy[i], s->frame[1].energy[i]); |
| } |
| |
| celt_decode_coarse_energy(s, rc); |
| celt_decode_tf_changes (s, rc, transient); |
| celt_decode_allocation (s, rc); |
| celt_decode_fine_energy (s, rc); |
| celt_decode_bands (s, rc); |
| |
| if (s->anticollapse_bit) |
| anticollapse = opus_getrawbits(rc, 1); |
| |
| celt_decode_final_energy(s, rc, s->framebits - opus_rc_tell(rc)); |
| |
| /* apply anti-collapse processing and denormalization to |
| * each coded channel */ |
| for (i = 0; i < s->coded_channels; i++) { |
| CeltFrame *frame = &s->frame[i]; |
| |
| if (anticollapse) |
| process_anticollapse(s, frame, s->coeffs[i]); |
| |
| celt_denormalize(s, frame, s->coeffs[i]); |
| } |
| |
| /* stereo -> mono downmix */ |
| if (s->output_channels < s->coded_channels) { |
| s->dsp->vector_fmac_scalar(s->coeffs[0], s->coeffs[1], 1.0, FFALIGN(frame_size, 16)); |
| imdct_scale = 0.5; |
| } else if (s->output_channels > s->coded_channels) |
| memcpy(s->coeffs[1], s->coeffs[0], frame_size * sizeof(float)); |
| |
| if (silence) { |
| for (i = 0; i < 2; i++) { |
| CeltFrame *frame = &s->frame[i]; |
| |
| for (j = 0; j < FF_ARRAY_ELEMS(frame->energy); j++) |
| frame->energy[j] = CELT_ENERGY_SILENCE; |
| } |
| memset(s->coeffs, 0, sizeof(s->coeffs)); |
| } |
| |
| /* transform and output for each output channel */ |
| for (i = 0; i < s->output_channels; i++) { |
| CeltFrame *frame = &s->frame[i]; |
| float m = frame->deemph_coeff; |
| |
| /* iMDCT and overlap-add */ |
| for (j = 0; j < s->blocks; j++) { |
| float *dst = frame->buf + 1024 + j * s->blocksize; |
| |
| imdct->imdct_half(imdct, dst + CELT_OVERLAP / 2, s->coeffs[i] + j, |
| s->blocks, imdct_scale); |
| s->dsp->vector_fmul_window(dst, dst, dst + CELT_OVERLAP / 2, |
| celt_window, CELT_OVERLAP / 2); |
| } |
| |
| /* postfilter */ |
| celt_postfilter(s, frame); |
| |
| /* deemphasis and output scaling */ |
| for (j = 0; j < frame_size; j++) { |
| float tmp = frame->buf[1024 - frame_size + j] + m; |
| m = tmp * CELT_DEEMPH_COEFF; |
| output[i][j] = tmp / 32768.; |
| } |
| frame->deemph_coeff = m; |
| } |
| |
| if (coded_channels == 1) |
| memcpy(s->frame[1].energy, s->frame[0].energy, sizeof(s->frame[0].energy)); |
| |
| for (i = 0; i < 2; i++ ) { |
| CeltFrame *frame = &s->frame[i]; |
| |
| if (!transient) { |
| memcpy(frame->prev_energy[1], frame->prev_energy[0], sizeof(frame->prev_energy[0])); |
| memcpy(frame->prev_energy[0], frame->energy, sizeof(frame->prev_energy[0])); |
| } else { |
| for (j = 0; j < CELT_MAX_BANDS; j++) |
| frame->prev_energy[0][j] = FFMIN(frame->prev_energy[0][j], frame->energy[j]); |
| } |
| |
| for (j = 0; j < s->startband; j++) { |
| frame->prev_energy[0][j] = CELT_ENERGY_SILENCE; |
| frame->energy[j] = 0.0; |
| } |
| for (j = s->endband; j < CELT_MAX_BANDS; j++) { |
| frame->prev_energy[0][j] = CELT_ENERGY_SILENCE; |
| frame->energy[j] = 0.0; |
| } |
| } |
| |
| s->seed = rc->range; |
| |
| return 0; |
| } |
| |
| void ff_celt_flush(CeltContext *s) |
| { |
| int i, j; |
| |
| if (s->flushed) |
| return; |
| |
| for (i = 0; i < 2; i++) { |
| CeltFrame *frame = &s->frame[i]; |
| |
| for (j = 0; j < CELT_MAX_BANDS; j++) |
| frame->prev_energy[0][j] = frame->prev_energy[1][j] = CELT_ENERGY_SILENCE; |
| |
| memset(frame->energy, 0, sizeof(frame->energy)); |
| memset(frame->buf, 0, sizeof(frame->buf)); |
| |
| memset(frame->pf_gains, 0, sizeof(frame->pf_gains)); |
| memset(frame->pf_gains_old, 0, sizeof(frame->pf_gains_old)); |
| memset(frame->pf_gains_new, 0, sizeof(frame->pf_gains_new)); |
| |
| frame->deemph_coeff = 0.0; |
| } |
| s->seed = 0; |
| |
| s->flushed = 1; |
| } |
| |
| void ff_celt_free(CeltContext **ps) |
| { |
| CeltContext *s = *ps; |
| int i; |
| |
| if (!s) |
| return; |
| |
| for (i = 0; i < FF_ARRAY_ELEMS(s->imdct); i++) |
| ff_imdct15_uninit(&s->imdct[i]); |
| |
| av_freep(&s->dsp); |
| av_freep(ps); |
| } |
| |
| int ff_celt_init(AVCodecContext *avctx, CeltContext **ps, int output_channels) |
| { |
| CeltContext *s; |
| int i, ret; |
| |
| if (output_channels != 1 && output_channels != 2) { |
| av_log(avctx, AV_LOG_ERROR, "Invalid number of output channels: %d\n", |
| output_channels); |
| return AVERROR(EINVAL); |
| } |
| |
| s = av_mallocz(sizeof(*s)); |
| if (!s) |
| return AVERROR(ENOMEM); |
| |
| s->avctx = avctx; |
| s->output_channels = output_channels; |
| |
| for (i = 0; i < FF_ARRAY_ELEMS(s->imdct); i++) { |
| ret = ff_imdct15_init(&s->imdct[i], i + 3); |
| if (ret < 0) |
| goto fail; |
| } |
| |
| s->dsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT); |
| if (!s->dsp) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| |
| ff_celt_flush(s); |
| |
| *ps = s; |
| |
| return 0; |
| fail: |
| ff_celt_free(&s); |
| return ret; |
| } |
