From b70d7a4ac72d23f3448f3b08b770fdf5f57de222 Mon Sep 17 00:00:00 2001 From: Anton Khirnov Date: Thu, 17 Apr 2014 12:51:03 +0200 Subject: lavc: add a native Opus decoder. Initial implementation by Andrew D'Addesio during GSoC 2012. Completion by Anton Khirnov , sponsored by the Mozilla Corporation. Further contributions by: Christophe Gisquet Janne Grunau Luca Barbato --- libavcodec/opus_silk.c | 1597 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1597 insertions(+) create mode 100644 libavcodec/opus_silk.c (limited to 'libavcodec/opus_silk.c') diff --git a/libavcodec/opus_silk.c b/libavcodec/opus_silk.c new file mode 100644 index 0000000000..3552484542 --- /dev/null +++ b/libavcodec/opus_silk.c @@ -0,0 +1,1597 @@ +/* + * Copyright (c) 2012 Andrew D'Addesio + * Copyright (c) 2013-2014 Mozilla Corporation + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * Opus SILK decoder + */ + +#include + +#include "opus.h" + +typedef struct SilkFrame { + int coded; + int log_gain; + int16_t nlsf[16]; + float lpc[16]; + + float output [2 * SILK_HISTORY]; + float lpc_history[2 * SILK_HISTORY]; + int primarylag; + + int prev_voiced; +} SilkFrame; + +struct SilkContext { + AVCodecContext *avctx; + int output_channels; + + int midonly; + int subframes; + int sflength; + int flength; + int nlsf_interp_factor; + + enum OpusBandwidth bandwidth; + int wb; + + SilkFrame frame[2]; + float prev_stereo_weights[2]; + float stereo_weights[2]; + + int prev_coded_channels; +}; + +static const uint16_t silk_model_stereo_s1[] = { + 256, 7, 9, 10, 11, 12, 22, 46, 54, 55, 56, 59, 82, 174, 197, 200, + 201, 202, 210, 234, 244, 245, 246, 247, 249, 256 +}; + +static const uint16_t silk_model_stereo_s2[] = {256, 85, 171, 256}; + +static const uint16_t silk_model_stereo_s3[] = {256, 51, 102, 154, 205, 256}; + +static const uint16_t silk_model_mid_only[] = {256, 192, 256}; + +static const uint16_t silk_model_frame_type_inactive[] = {256, 26, 256}; + +static const uint16_t silk_model_frame_type_active[] = {256, 24, 98, 246, 256}; + +static const uint16_t silk_model_gain_highbits[3][9] = { + {256, 32, 144, 212, 241, 253, 254, 255, 256}, + {256, 2, 19, 64, 124, 186, 233, 252, 256}, + {256, 1, 4, 30, 101, 195, 245, 254, 256} +}; + +static const uint16_t silk_model_gain_lowbits[] = {256, 32, 64, 96, 128, 160, 192, 224, 256}; + +static const uint16_t silk_model_gain_delta[] = { + 256, 6, 11, 22, 53, 185, 206, 214, 218, 221, 223, 225, 227, 228, 229, 230, + 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, + 247, 248, 249, 250, 251, 252, 253, 254, 255, 256 +}; +static const uint16_t silk_model_lsf_s1[2][2][33] = { + { + { // NB or MB, unvoiced + 256, 44, 78, 108, 127, 148, 160, 171, 174, 177, 179, 195, 197, 199, 200, 205, + 207, 208, 211, 214, 215, 216, 218, 220, 222, 225, 226, 235, 244, 246, 253, 255, 256 + }, { // NB or MB, voiced + 256, 1, 11, 12, 20, 23, 31, 39, 53, 66, 80, 81, 95, 107, 120, 131, + 142, 154, 165, 175, 185, 196, 204, 213, 221, 228, 236, 237, 238, 244, 245, 251, 256 + } + }, { + { // WB, unvoiced + 256, 31, 52, 55, 72, 73, 81, 98, 102, 103, 121, 137, 141, 143, 146, 147, + 157, 158, 161, 177, 188, 204, 206, 208, 211, 213, 224, 225, 229, 238, 246, 253, 256 + }, { // WB, voiced + 256, 1, 5, 21, 26, 44, 55, 60, 74, 89, 90, 93, 105, 118, 132, 146, + 152, 166, 178, 180, 186, 187, 199, 211, 222, 232, 235, 245, 250, 251, 252, 253, 256 + } + } +}; + +static const uint16_t silk_model_lsf_s2[32][10] = { + // NB, MB + { 256, 1, 2, 3, 18, 242, 253, 254, 255, 256 }, + { 256, 1, 2, 4, 38, 221, 253, 254, 255, 256 }, + { 256, 1, 2, 6, 48, 197, 252, 254, 255, 256 }, + { 256, 1, 2, 10, 62, 185, 246, 254, 255, 256 }, + { 256, 1, 4, 20, 73, 174, 248, 254, 255, 256 }, + { 256, 1, 4, 21, 76, 166, 239, 254, 255, 256 }, + { 256, 1, 8, 32, 85, 159, 226, 252, 255, 256 }, + { 256, 1, 2, 20, 83, 161, 219, 249, 255, 256 }, + + // WB + { 256, 1, 2, 3, 12, 244, 253, 254, 255, 256 }, + { 256, 1, 2, 4, 32, 218, 253, 254, 255, 256 }, + { 256, 1, 2, 5, 47, 199, 252, 254, 255, 256 }, + { 256, 1, 2, 12, 61, 187, 252, 254, 255, 256 }, + { 256, 1, 5, 24, 72, 172, 249, 254, 255, 256 }, + { 256, 1, 2, 16, 70, 170, 242, 254, 255, 256 }, + { 256, 1, 2, 17, 78, 165, 226, 251, 255, 256 }, + { 256, 1, 8, 29, 79, 156, 237, 254, 255, 256 } +}; + +static const uint16_t silk_model_lsf_s2_ext[] = { 256, 156, 216, 240, 249, 253, 255, 256 }; + +static const uint16_t silk_model_lsf_interpolation_offset[] = { 256, 13, 35, 64, 75, 256 }; + +static const uint16_t silk_model_pitch_highbits[] = { + 256, 3, 6, 12, 23, 44, 74, 106, 125, 136, 146, 158, 171, 184, 196, 207, + 216, 224, 231, 237, 241, 243, 245, 247, 248, 249, 250, 251, 252, 253, 254, 255, 256 +}; + +static const uint16_t silk_model_pitch_lowbits_nb[]= { 256, 64, 128, 192, 256 }; + +static const uint16_t silk_model_pitch_lowbits_mb[]= { 256, 43, 85, 128, 171, 213, 256 }; + +static const uint16_t silk_model_pitch_lowbits_wb[]= { 256, 32, 64, 96, 128, 160, 192, 224, 256 }; + +static const uint16_t silk_model_pitch_delta[] = { + 256, 46, 48, 50, 53, 57, 63, 73, 88, 114, 152, 182, 204, 219, 229, 236, + 242, 246, 250, 252, 254, 256 +}; + +static const uint16_t silk_model_pitch_contour_nb10ms[] = { 256, 143, 193, 256 }; + +static const uint16_t silk_model_pitch_contour_nb20ms[] = { + 256, 68, 80, 101, 118, 137, 159, 189, 213, 230, 246, 256 +}; + +static const uint16_t silk_model_pitch_contour_mbwb10ms[] = { + 256, 91, 137, 176, 195, 209, 221, 229, 236, 242, 247, 252, 256 +}; + +static const uint16_t silk_model_pitch_contour_mbwb20ms[] = { + 256, 33, 55, 73, 89, 104, 118, 132, 145, 158, 168, 177, 186, 194, 200, 206, + 212, 217, 221, 225, 229, 232, 235, 238, 240, 242, 244, 246, 248, 250, 252, 253, + 254, 255, 256 +}; + +static const uint16_t silk_model_ltp_filter[] = { 256, 77, 157, 256 }; + +static const uint16_t silk_model_ltp_filter0_sel[] = { + 256, 185, 200, 213, 226, 235, 244, 250, 256 +}; + +static const uint16_t silk_model_ltp_filter1_sel[] = { + 256, 57, 91, 112, 132, 147, 160, 172, 185, 195, 205, 214, 224, 233, 241, 248, 256 +}; + +static const uint16_t silk_model_ltp_filter2_sel[] = { + 256, 15, 31, 45, 57, 69, 81, 92, 103, 114, 124, 133, 142, 151, 160, 168, + 176, 184, 192, 199, 206, 212, 218, 223, 227, 232, 236, 240, 244, 247, 251, 254, 256 +}; + +static const uint16_t silk_model_ltp_scale_index[] = { 256, 128, 192, 256 }; + +static const uint16_t silk_model_lcg_seed[] = { 256, 64, 128, 192, 256 }; + +static const uint16_t silk_model_exc_rate[2][10] = { + { 256, 15, 66, 78, 124, 169, 182, 215, 242, 256 }, // unvoiced + { 256, 33, 63, 99, 116, 150, 199, 217, 238, 256 } // voiced +}; + +static const uint16_t silk_model_pulse_count[11][19] = { + { 256, 131, 205, 230, 238, 241, 244, 245, 246, + 247, 248, 249, 250, 251, 252, 253, 254, 255, 256 }, + { 256, 58, 151, 211, 234, 241, 244, 245, 246, + 247, 248, 249, 250, 251, 252, 253, 254, 255, 256 }, + { 256, 43, 94, 140, 173, 197, 213, 224, 232, + 238, 241, 244, 247, 249, 250, 251, 253, 254, 256 }, + { 256, 17, 69, 140, 197, 228, 240, 245, 246, + 247, 248, 249, 250, 251, 252, 253, 254, 255, 256 }, + { 256, 6, 27, 68, 121, 170, 205, 226, 237, + 243, 246, 248, 250, 251, 252, 253, 254, 255, 256 }, + { 256, 7, 21, 43, 71, 100, 128, 153, 173, + 190, 203, 214, 223, 230, 235, 239, 243, 246, 256 }, + { 256, 2, 7, 21, 50, 92, 138, 179, 210, + 229, 240, 246, 249, 251, 252, 253, 254, 255, 256 }, + { 256, 1, 3, 7, 17, 36, 65, 100, 137, + 171, 199, 219, 233, 241, 246, 250, 252, 254, 256 }, + { 256, 1, 3, 5, 10, 19, 33, 53, 77, + 104, 132, 158, 181, 201, 216, 227, 235, 241, 256 }, + { 256, 1, 2, 3, 9, 36, 94, 150, 189, + 214, 228, 238, 244, 247, 250, 252, 253, 254, 256 }, + { 256, 2, 3, 9, 36, 94, 150, 189, 214, + 228, 238, 244, 247, 250, 252, 253, 254, 256, 256 } +}; + +static const uint16_t silk_model_pulse_location[4][168] = { + { + 256, 126, 256, + 256, 56, 198, 256, + 256, 25, 126, 230, 256, + 256, 12, 72, 180, 244, 256, + 256, 7, 42, 126, 213, 250, 256, + 256, 4, 24, 83, 169, 232, 253, 256, + 256, 3, 15, 53, 125, 200, 242, 254, 256, + 256, 2, 10, 35, 89, 162, 221, 248, 255, 256, + 256, 2, 7, 24, 63, 126, 191, 233, 251, 255, 256, + 256, 1, 5, 17, 45, 94, 157, 211, 241, 252, 255, 256, + 256, 1, 5, 13, 33, 70, 125, 182, 223, 245, 253, 255, 256, + 256, 1, 4, 11, 26, 54, 98, 151, 199, 232, 248, 254, 255, 256, + 256, 1, 3, 9, 21, 42, 77, 124, 172, 212, 237, 249, 254, 255, 256, + 256, 1, 2, 6, 16, 33, 60, 97, 144, 187, 220, 241, 250, 254, 255, 256, + 256, 1, 2, 3, 11, 25, 47, 80, 120, 163, 201, 229, 245, 253, 254, 255, 256, + 256, 1, 2, 3, 4, 17, 35, 62, 98, 139, 180, 214, 238, 252, 253, 254, 255, 256 + },{ + 256, 127, 256, + 256, 53, 202, 256, + 256, 22, 127, 233, 256, + 256, 11, 72, 183, 246, 256, + 256, 6, 41, 127, 215, 251, 256, + 256, 4, 24, 83, 170, 232, 253, 256, + 256, 3, 16, 56, 127, 200, 241, 254, 256, + 256, 3, 12, 39, 92, 162, 218, 246, 255, 256, + 256, 3, 11, 30, 67, 124, 185, 229, 249, 255, 256, + 256, 3, 10, 25, 53, 97, 151, 200, 233, 250, 255, 256, + 256, 1, 8, 21, 43, 77, 123, 171, 209, 237, 251, 255, 256, + 256, 1, 2, 13, 35, 62, 97, 139, 186, 219, 244, 254, 255, 256, + 256, 1, 2, 8, 22, 48, 85, 128, 171, 208, 234, 248, 254, 255, 256, + 256, 1, 2, 6, 16, 36, 67, 107, 149, 189, 220, 240, 250, 254, 255, 256, + 256, 1, 2, 5, 13, 29, 55, 90, 128, 166, 201, 227, 243, 251, 254, 255, 256, + 256, 1, 2, 4, 10, 22, 43, 73, 109, 147, 183, 213, 234, 246, 252, 254, 255, 256 + },{ + 256, 127, 256, + 256, 49, 206, 256, + 256, 20, 127, 236, 256, + 256, 11, 71, 184, 246, 256, + 256, 7, 43, 127, 214, 250, 256, + 256, 6, 30, 87, 169, 229, 252, 256, + 256, 5, 23, 62, 126, 194, 236, 252, 256, + 256, 6, 20, 49, 96, 157, 209, 239, 253, 256, + 256, 1, 16, 39, 74, 125, 175, 215, 245, 255, 256, + 256, 1, 2, 23, 55, 97, 149, 195, 236, 254, 255, 256, + 256, 1, 7, 23, 50, 86, 128, 170, 206, 233, 249, 255, 256, + 256, 1, 6, 18, 39, 70, 108, 148, 186, 217, 238, 250, 255, 256, + 256, 1, 4, 13, 30, 56, 90, 128, 166, 200, 226, 243, 252, 255, 256, + 256, 1, 4, 11, 25, 47, 76, 110, 146, 180, 209, 231, 245, 252, 255, 256, + 256, 1, 3, 8, 19, 37, 62, 93, 128, 163, 194, 219, 237, 248, 253, 255, 256, + 256, 1, 2, 6, 15, 30, 51, 79, 111, 145, 177, 205, 226, 241, 250, 254, 255, 256 + },{ + 256, 128, 256, + 256, 42, 214, 256, + 256, 21, 128, 235, 256, + 256, 12, 72, 184, 245, 256, + 256, 8, 42, 128, 214, 249, 256, + 256, 8, 31, 86, 176, 231, 251, 256, + 256, 5, 20, 58, 130, 202, 238, 253, 256, + 256, 6, 18, 45, 97, 174, 221, 241, 251, 256, + 256, 6, 25, 53, 88, 128, 168, 203, 231, 250, 256, + 256, 4, 18, 40, 71, 108, 148, 185, 216, 238, 252, 256, + 256, 3, 13, 31, 57, 90, 128, 166, 199, 225, 243, 253, 256, + 256, 2, 10, 23, 44, 73, 109, 147, 183, 212, 233, 246, 254, 256, + 256, 1, 6, 16, 33, 58, 90, 128, 166, 198, 223, 240, 250, 255, 256, + 256, 1, 5, 12, 25, 46, 75, 110, 146, 181, 210, 231, 244, 251, 255, 256, + 256, 1, 3, 8, 18, 35, 60, 92, 128, 164, 196, 221, 238, 248, 253, 255, 256, + 256, 1, 3, 7, 14, 27, 48, 76, 110, 146, 180, 208, 229, 242, 249, 253, 255, 256 + } +}; + +static const uint16_t silk_model_excitation_lsb[] = {256, 136, 256}; + +static const uint16_t silk_model_excitation_sign[3][2][7][3] = { + { // Inactive + { // Low offset + {256, 2, 256}, + {256, 207, 256}, + {256, 189, 256}, + {256, 179, 256}, + {256, 174, 256}, + {256, 163, 256}, + {256, 157, 256} + }, { // High offset + {256, 58, 256}, + {256, 245, 256}, + {256, 238, 256}, + {256, 232, 256}, + {256, 225, 256}, + {256, 220, 256}, + {256, 211, 256} + } + }, { // Unvoiced + { // Low offset + {256, 1, 256}, + {256, 210, 256}, + {256, 190, 256}, + {256, 178, 256}, + {256, 169, 256}, + {256, 162, 256}, + {256, 152, 256} + }, { // High offset + {256, 48, 256}, + {256, 242, 256}, + {256, 235, 256}, + {256, 224, 256}, + {256, 214, 256}, + {256, 205, 256}, + {256, 190, 256} + } + }, { // Voiced + { // Low offset + {256, 1, 256}, + {256, 162, 256}, + {256, 152, 256}, + {256, 147, 256}, + {256, 144, 256}, + {256, 141, 256}, + {256, 138, 256} + }, { // High offset + {256, 8, 256}, + {256, 203, 256}, + {256, 187, 256}, + {256, 176, 256}, + {256, 168, 256}, + {256, 161, 256}, + {256, 154, 256} + } + } +}; + +static const int16_t silk_stereo_weights[] = { + -13732, -10050, -8266, -7526, -6500, -5000, -2950, -820, + 820, 2950, 5000, 6500, 7526, 8266, 10050, 13732 +}; + +static const uint8_t silk_lsf_s2_model_sel_nbmb[32][10] = { + { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, + { 1, 3, 1, 2, 2, 1, 2, 1, 1, 1 }, + { 2, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, + { 1, 2, 2, 2, 2, 1, 2, 1, 1, 1 }, + { 2, 3, 3, 3, 3, 2, 2, 2, 2, 2 }, + { 0, 5, 3, 3, 2, 2, 2, 2, 1, 1 }, + { 0, 2, 2, 2, 2, 2, 2, 2, 2, 1 }, + { 2, 3, 6, 4, 4, 4, 5, 4, 5, 5 }, + { 2, 4, 5, 5, 4, 5, 4, 6, 4, 4 }, + { 2, 4, 4, 7, 4, 5, 4, 5, 5, 4 }, + { 4, 3, 3, 3, 2, 3, 2, 2, 2, 2 }, + { 1, 5, 5, 6, 4, 5, 4, 5, 5, 5 }, + { 2, 7, 4, 6, 5, 5, 5, 5, 5, 5 }, + { 2, 7, 5, 5, 5, 5, 5, 6, 5, 4 }, + { 3, 3, 5, 4, 4, 5, 4, 5, 4, 4 }, + { 2, 3, 3, 5, 5, 4, 4, 4, 4, 4 }, + { 2, 4, 4, 6, 4, 5, 4, 5, 5, 5 }, + { 2, 5, 4, 6, 5, 5, 5, 4, 5, 4 }, + { 2, 7, 4, 5, 4, 5, 4, 5, 5, 5 }, + { 2, 5, 4, 6, 7, 6, 5, 6, 5, 4 }, + { 3, 6, 7, 4, 6, 5, 5, 6, 4, 5 }, + { 2, 7, 6, 4, 4, 4, 5, 4, 5, 5 }, + { 4, 5, 5, 4, 6, 6, 5, 6, 5, 4 }, + { 2, 5, 5, 6, 5, 6, 4, 6, 4, 4 }, + { 4, 5, 5, 5, 3, 7, 4, 5, 5, 4 }, + { 2, 3, 4, 5, 5, 6, 4, 5, 5, 4 }, + { 2, 3, 2, 3, 3, 4, 2, 3, 3, 3 }, + { 1, 1, 2, 2, 2, 2, 2, 3, 2, 2 }, + { 4, 5, 5, 6, 6, 6, 5, 6, 4, 5 }, + { 3, 5, 5, 4, 4, 4, 4, 3, 3, 2 }, + { 2, 5, 3, 7, 5, 5, 4, 4, 5, 4 }, + { 4, 4, 5, 4, 5, 6, 5, 6, 5, 4 } +}; + +static const uint8_t silk_lsf_s2_model_sel_wb[32][16] = { + { 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8 }, + { 10, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 9, 9, 9, 8, 11 }, + { 10, 13, 13, 11, 15, 12, 12, 13, 10, 13, 12, 13, 13, 12, 11, 11 }, + { 8, 10, 9, 10, 10, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 9 }, + { 8, 14, 13, 12, 14, 12, 15, 13, 12, 12, 12, 13, 13, 12, 12, 11 }, + { 8, 11, 13, 13, 12, 11, 11, 13, 11, 11, 11, 11, 11, 11, 10, 12 }, + { 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8 }, + { 8, 10, 14, 11, 15, 10, 13, 11, 12, 13, 13, 12, 11, 11, 10, 11 }, + { 8, 14, 10, 14, 14, 12, 13, 12, 14, 13, 12, 12, 13, 11, 11, 11 }, + { 10, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8 }, + { 8, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9 }, + { 10, 10, 11, 12, 13, 11, 11, 11, 11, 11, 11, 11, 10, 10, 9, 11 }, + { 10, 10, 11, 11, 12, 11, 11, 11, 11, 11, 11, 11, 11, 10, 9, 11 }, + { 11, 12, 12, 12, 14, 12, 12, 13, 11, 13, 12, 12, 13, 12, 11, 12 }, + { 8, 14, 12, 13, 12, 15, 13, 10, 14, 13, 15, 12, 12, 11, 13, 11 }, + { 8, 9, 8, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 9, 8 }, + { 9, 14, 13, 15, 13, 12, 13, 11, 12, 13, 12, 12, 12, 11, 11, 12 }, + { 9, 11, 11, 12, 12, 11, 11, 13, 10, 11, 11, 13, 13, 13, 11, 12 }, + { 10, 11, 11, 10, 10, 10, 11, 10, 9, 10, 9, 10, 9, 9, 9, 12 }, + { 8, 10, 11, 13, 11, 11, 10, 10, 10, 9, 9, 8, 8, 8, 8, 8 }, + { 11, 12, 11, 13, 11, 11, 10, 10, 9, 9, 9, 9, 9, 10, 10, 12 }, + { 10, 14, 11, 15, 15, 12, 13, 12, 13, 11, 13, 11, 11, 10, 11, 11 }, + { 10, 11, 13, 14, 14, 11, 13, 11, 12, 12, 11, 11, 11, 11, 10, 12 }, + { 9, 11, 11, 12, 12, 12, 12, 11, 13, 13, 13, 11, 9, 9, 9, 9 }, + { 10, 13, 11, 14, 14, 12, 15, 12, 12, 13, 11, 12, 12, 11, 11, 11 }, + { 8, 14, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8 }, + { 8, 14, 14, 11, 13, 10, 13, 13, 11, 12, 12, 15, 15, 12, 12, 12 }, + { 11, 11, 15, 11, 13, 12, 11, 11, 11, 10, 10, 11, 11, 11, 10, 11 }, + { 8, 8, 9, 8, 8, 8, 10, 9, 10, 9, 9, 10, 10, 10, 9, 9 }, + { 8, 11, 10, 13, 11, 11, 10, 11, 10, 9, 8, 8, 9, 8, 8, 9 }, + { 11, 13, 13, 12, 15, 13, 11, 11, 10, 11, 10, 10, 9, 8, 9, 8 }, + { 10, 11, 13, 11, 12, 11, 11, 11, 10, 9, 10, 14, 12, 8, 8, 8 } +}; + +static const uint8_t silk_lsf_pred_weights_nbmb[2][9] = { + {179, 138, 140, 148, 151, 149, 153, 151, 163}, + {116, 67, 82, 59, 92, 72, 100, 89, 92} +}; + +static const uint8_t silk_lsf_pred_weights_wb[2][15] = { + {175, 148, 160, 176, 178, 173, 174, 164, 177, 174, 196, 182, 198, 192, 182}, + { 68, 62, 66, 60, 72, 117, 85, 90, 118, 136, 151, 142, 160, 142, 155} +}; + +static const uint8_t silk_lsf_weight_sel_nbmb[32][9] = { + { 0, 1, 0, 0, 0, 0, 0, 0, 0 }, + { 1, 0, 0, 0, 0, 0, 0, 0, 0 }, + { 0, 0, 0, 0, 0, 0, 0, 0, 0 }, + { 1, 1, 1, 0, 0, 0, 0, 1, 0 }, + { 0, 1, 0, 0, 0, 0, 0, 0, 0 }, + { 0, 1, 0, 0, 0, 0, 0, 0, 0 }, + { 1, 0, 1, 1, 0, 0, 0, 1, 0 }, + { 0, 1, 1, 0, 0, 1, 1, 0, 0 }, + { 0, 0, 1, 1, 0, 1, 0, 1, 1 }, + { 0, 0, 1, 1, 0, 0, 1, 1, 1 }, + { 0, 0, 0, 0, 0, 0, 0, 0, 0 }, + { 0, 1, 0, 1, 1, 1, 1, 1, 0 }, + { 0, 1, 0, 1, 1, 1, 1, 1, 0 }, + { 0, 1, 1, 1, 1, 1, 1, 1, 0 }, + { 1, 0, 1, 1, 0, 1, 1, 1, 1 }, + { 0, 1, 1, 1, 1, 1, 0, 1, 0 }, + { 0, 0, 1, 1, 0, 1, 0, 1, 0 }, + { 0, 0, 1, 1, 1, 0, 1, 1, 1 }, + { 0, 1, 1, 0, 0, 1, 1, 1, 0 }, + { 0, 0, 0, 1, 1, 1, 0, 1, 0 }, + { 0, 1, 1, 0, 0, 1, 0, 1, 0 }, + { 0, 1, 1, 0, 0, 0, 1, 1, 0 }, + { 0, 0, 0, 0, 0, 1, 1, 1, 1 }, + { 0, 0, 1, 1, 0, 0, 0, 1, 1 }, + { 0, 0, 0, 1, 0, 1, 1, 1, 1 }, + { 0, 1, 1, 1, 1, 1, 1, 1, 0 }, + { 0, 0, 0, 0, 0, 0, 0, 0, 0 }, + { 0, 0, 0, 0, 0, 0, 0, 0, 0 }, + { 0, 0, 1, 0, 1, 1, 0, 1, 0 }, + { 1, 0, 0, 1, 0, 0, 0, 0, 0 }, + { 0, 0, 0, 1, 1, 0, 1, 0, 1 }, + { 1, 0, 1, 1, 0, 1, 1, 1, 1 } +}; + +static const uint8_t silk_lsf_weight_sel_wb[32][15] = { + { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }, + { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, + { 0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0 }, + { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0 }, + { 0, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 0 }, + { 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, + { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0 }, + { 0, 1, 1, 0, 0, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1 }, + { 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1 }, + { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }, + { 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, + { 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0 }, + { 0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 1, 0, 0 }, + { 0, 0, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 0, 0 }, + { 0, 1, 0, 0, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1 }, + { 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0 }, + { 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 0 }, + { 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 0 }, + { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }, + { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0 }, + { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, + { 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 1, 0 }, + { 0, 0, 1, 1, 1, 1, 0, 1, 1, 0, 0, 1, 1, 0, 0 }, + { 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0 }, + { 0, 0, 0, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1 }, + { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }, + { 0, 1, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1 }, + { 0, 0, 0, 0, 0, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1 }, + { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }, + { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }, + { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0 }, + { 0, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 1, 0 } +}; + +static const uint8_t silk_lsf_codebook_nbmb[32][10] = { + { 12, 35, 60, 83, 108, 132, 157, 180, 206, 228 }, + { 15, 32, 55, 77, 101, 125, 151, 175, 201, 225 }, + { 19, 42, 66, 89, 114, 137, 162, 184, 209, 230 }, + { 12, 25, 50, 72, 97, 120, 147, 172, 200, 223 }, + { 26, 44, 69, 90, 114, 135, 159, 180, 205, 225 }, + { 13, 22, 53, 80, 106, 130, 156, 180, 205, 228 }, + { 15, 25, 44, 64, 90, 115, 142, 168, 196, 222 }, + { 19, 24, 62, 82, 100, 120, 145, 168, 190, 214 }, + { 22, 31, 50, 79, 103, 120, 151, 170, 203, 227 }, + { 21, 29, 45, 65, 106, 124, 150, 171, 196, 224 }, + { 30, 49, 75, 97, 121, 142, 165, 186, 209, 229 }, + { 19, 25, 52, 70, 93, 116, 143, 166, 192, 219 }, + { 26, 34, 62, 75, 97, 118, 145, 167, 194, 217 }, + { 25, 33, 56, 70, 91, 113, 143, 165, 196, 223 }, + { 21, 34, 51, 72, 97, 117, 145, 171, 196, 222 }, + { 20, 29, 50, 67, 90, 117, 144, 168, 197, 221 }, + { 22, 31, 48, 66, 95, 117, 146, 168, 196, 222 }, + { 24, 33, 51, 77, 116, 134, 158, 180, 200, 224 }, + { 21, 28, 70, 87, 106, 124, 149, 170, 194, 217 }, + { 26, 33, 53, 64, 83, 117, 152, 173, 204, 225 }, + { 27, 34, 65, 95, 108, 129, 155, 174, 210, 225 }, + { 20, 26, 72, 99, 113, 131, 154, 176, 200, 219 }, + { 34, 43, 61, 78, 93, 114, 155, 177, 205, 229 }, + { 23, 29, 54, 97, 124, 138, 163, 179, 209, 229 }, + { 30, 38, 56, 89, 118, 129, 158, 178, 200, 231 }, + { 21, 29, 49, 63, 85, 111, 142, 163, 193, 222 }, + { 27, 48, 77, 103, 133, 158, 179, 196, 215, 232 }, + { 29, 47, 74, 99, 124, 151, 176, 198, 220, 237 }, + { 33, 42, 61, 76, 93, 121, 155, 174, 207, 225 }, + { 29, 53, 87, 112, 136, 154, 170, 188, 208, 227 }, + { 24, 30, 52, 84, 131, 150, 166, 186, 203, 229 }, + { 37, 48, 64, 84, 104, 118, 156, 177, 201, 230 } +}; + +static const uint8_t silk_lsf_codebook_wb[32][16] = { + { 7, 23, 38, 54, 69, 85, 100, 116, 131, 147, 162, 178, 193, 208, 223, 239 }, + { 13, 25, 41, 55, 69, 83, 98, 112, 127, 142, 157, 171, 187, 203, 220, 236 }, + { 15, 21, 34, 51, 61, 78, 92, 106, 126, 136, 152, 167, 185, 205, 225, 240 }, + { 10, 21, 36, 50, 63, 79, 95, 110, 126, 141, 157, 173, 189, 205, 221, 237 }, + { 17, 20, 37, 51, 59, 78, 89, 107, 123, 134, 150, 164, 184, 205, 224, 240 }, + { 10, 15, 32, 51, 67, 81, 96, 112, 129, 142, 158, 173, 189, 204, 220, 236 }, + { 8, 21, 37, 51, 65, 79, 98, 113, 126, 138, 155, 168, 179, 192, 209, 218 }, + { 12, 15, 34, 55, 63, 78, 87, 108, 118, 131, 148, 167, 185, 203, 219, 236 }, + { 16, 19, 32, 36, 56, 79, 91, 108, 118, 136, 154, 171, 186, 204, 220, 237 }, + { 11, 28, 43, 58, 74, 89, 105, 120, 135, 150, 165, 180, 196, 211, 226, 241 }, + { 6, 16, 33, 46, 60, 75, 92, 107, 123, 137, 156, 169, 185, 199, 214, 225 }, + { 11, 19, 30, 44, 57, 74, 89, 105, 121, 135, 152, 169, 186, 202, 218, 234 }, + { 12, 19, 29, 46, 57, 71, 88, 100, 120, 132, 148, 165, 182, 199, 216, 233 }, + { 17, 23, 35, 46, 56, 77, 92, 106, 123, 134, 152, 167, 185, 204, 222, 237 }, + { 14, 17, 45, 53, 63, 75, 89, 107, 115, 132, 151, 171, 188, 206, 221, 240 }, + { 9, 16, 29, 40, 56, 71, 88, 103, 119, 137, 154, 171, 189, 205, 222, 237 }, + { 16, 19, 36, 48, 57, 76, 87, 105, 118, 132, 150, 167, 185, 202, 218, 236 }, + { 12, 17, 29, 54, 71, 81, 94, 104, 126, 136, 149, 164, 182, 201, 221, 237 }, + { 15, 28, 47, 62, 79, 97, 115, 129, 142, 155, 168, 180, 194, 208, 223, 238 }, + { 8, 14, 30, 45, 62, 78, 94, 111, 127, 143, 159, 175, 192, 207, 223, 239 }, + { 17, 30, 49, 62, 79, 92, 107, 119, 132, 145, 160, 174, 190, 204, 220, 235 }, + { 14, 19, 36, 45, 61, 76, 91, 108, 121, 138, 154, 172, 189, 205, 222, 238 }, + { 12, 18, 31, 45, 60, 76, 91, 107, 123, 138, 154, 171, 187, 204, 221, 236 }, + { 13, 17, 31, 43, 53, 70, 83, 103, 114, 131, 149, 167, 185, 203, 220, 237 }, + { 17, 22, 35, 42, 58, 78, 93, 110, 125, 139, 155, 170, 188, 206, 224, 240 }, + { 8, 15, 34, 50, 67, 83, 99, 115, 131, 146, 162, 178, 193, 209, 224, 239 }, + { 13, 16, 41, 66, 73, 86, 95, 111, 128, 137, 150, 163, 183, 206, 225, 241 }, + { 17, 25, 37, 52, 63, 75, 92, 102, 119, 132, 144, 160, 175, 191, 212, 231 }, + { 19, 31, 49, 65, 83, 100, 117, 133, 147, 161, 174, 187, 200, 213, 227, 242 }, + { 18, 31, 52, 68, 88, 103, 117, 126, 138, 149, 163, 177, 192, 207, 223, 239 }, + { 16, 29, 47, 61, 76, 90, 106, 119, 133, 147, 161, 176, 193, 209, 224, 240 }, + { 15, 21, 35, 50, 61, 73, 86, 97, 110, 119, 129, 141, 175, 198, 218, 237 } +}; + +static const uint16_t silk_lsf_min_spacing_nbmb[] = { + 250, 3, 6, 3, 3, 3, 4, 3, 3, 3, 461 +}; + +static const uint16_t silk_lsf_min_spacing_wb[] = { + 100, 3, 40, 3, 3, 3, 5, 14, 14, 10, 11, 3, 8, 9, 7, 3, 347 +}; + +static const uint8_t silk_lsf_ordering_nbmb[] = { + 0, 9, 6, 3, 4, 5, 8, 1, 2, 7 +}; + +static const uint8_t silk_lsf_ordering_wb[] = { + 0, 15, 8, 7, 4, 11, 12, 3, 2, 13, 10, 5, 6, 9, 14, 1 +}; + +static const int16_t silk_cosine[] = { /* (0.12) */ + 4096, 4095, 4091, 4085, + 4076, 4065, 4052, 4036, + 4017, 3997, 3973, 3948, + 3920, 3889, 3857, 3822, + 3784, 3745, 3703, 3659, + 3613, 3564, 3513, 3461, + 3406, 3349, 3290, 3229, + 3166, 3102, 3035, 2967, + 2896, 2824, 2751, 2676, + 2599, 2520, 2440, 2359, + 2276, 2191, 2106, 2019, + 1931, 1842, 1751, 1660, + 1568, 1474, 1380, 1285, + 1189, 1093, 995, 897, + 799, 700, 601, 501, + 401, 301, 201, 101, + 0, -101, -201, -301, + -401, -501, -601, -700, + -799, -897, -995, -1093, + -1189, -1285, -1380, -1474, + -1568, -1660, -1751, -1842, + -1931, -2019, -2106, -2191, + -2276, -2359, -2440, -2520, + -2599, -2676, -2751, -2824, + -2896, -2967, -3035, -3102, + -3166, -3229, -3290, -3349, + -3406, -3461, -3513, -3564, + -3613, -3659, -3703, -3745, + -3784, -3822, -3857, -3889, + -3920, -3948, -3973, -3997, + -4017, -4036, -4052, -4065, + -4076, -4085, -4091, -4095, + -4096 +}; + +static const uint16_t silk_pitch_scale[] = { 4, 6, 8}; + +static const uint16_t silk_pitch_min_lag[] = { 16, 24, 32}; + +static const uint16_t silk_pitch_max_lag[] = {144, 216, 288}; + +static const int8_t silk_pitch_offset_nb10ms[3][2] = { + { 0, 0}, + { 1, 0}, + { 0, 1} +}; + +static const int8_t silk_pitch_offset_nb20ms[11][4] = { + { 0, 0, 0, 0}, + { 2, 1, 0, -1}, + {-1, 0, 1, 2}, + {-1, 0, 0, 1}, + {-1, 0, 0, 0}, + { 0, 0, 0, 1}, + { 0, 0, 1, 1}, + { 1, 1, 0, 0}, + { 1, 0, 0, 0}, + { 0, 0, 0, -1}, + { 1, 0, 0, -1} +}; + +static const int8_t silk_pitch_offset_mbwb10ms[12][2] = { + { 0, 0}, + { 0, 1}, + { 1, 0}, + {-1, 1}, + { 1, -1}, + {-1, 2}, + { 2, -1}, + {-2, 2}, + { 2, -2}, + {-2, 3}, + { 3, -2}, + {-3, 3} +}; + +static const int8_t silk_pitch_offset_mbwb20ms[34][4] = { + { 0, 0, 0, 0}, + { 0, 0, 1, 1}, + { 1, 1, 0, 0}, + {-1, 0, 0, 0}, + { 0, 0, 0, 1}, + { 1, 0, 0, 0}, + {-1, 0, 0, 1}, + { 0, 0, 0, -1}, + {-1, 0, 1, 2}, + { 1, 0, 0, -1}, + {-2, -1, 1, 2}, + { 2, 1, 0, -1}, + {-2, 0, 0, 2}, + {-2, 0, 1, 3}, + { 2, 1, -1, -2}, + {-3, -1, 1, 3}, + { 2, 0, 0, -2}, + { 3, 1, 0, -2}, + {-3, -1, 2, 4}, + {-4, -1, 1, 4}, + { 3, 1, -1, -3}, + {-4, -1, 2, 5}, + { 4, 2, -1, -3}, + { 4, 1, -1, -4}, + {-5, -1, 2, 6}, + { 5, 2, -1, -4}, + {-6, -2, 2, 6}, + {-5, -2, 2, 5}, + { 6, 2, -1, -5}, + {-7, -2, 3, 8}, + { 6, 2, -2, -6}, + { 5, 2, -2, -5}, + { 8, 3, -2, -7}, + {-9, -3, 3, 9} +}; + +static const int8_t silk_ltp_filter0_taps[8][5] = { + { 4, 6, 24, 7, 5}, + { 0, 0, 2, 0, 0}, + { 12, 28, 41, 13, -4}, + { -9, 15, 42, 25, 14}, + { 1, -2, 62, 41, -9}, + {-10, 37, 65, -4, 3}, + { -6, 4, 66, 7, -8}, + { 16, 14, 38, -3, 33} +}; + +static const int8_t silk_ltp_filter1_taps[16][5] = { + { 13, 22, 39, 23, 12}, + { -1, 36, 64, 27, -6}, + { -7, 10, 55, 43, 17}, + { 1, 1, 8, 1, 1}, + { 6, -11, 74, 53, -9}, + {-12, 55, 76, -12, 8}, + { -3, 3, 93, 27, -4}, + { 26, 39, 59, 3, -8}, + { 2, 0, 77, 11, 9}, + { -8, 22, 44, -6, 7}, + { 40, 9, 26, 3, 9}, + { -7, 20, 101, -7, 4}, + { 3, -8, 42, 26, 0}, + {-15, 33, 68, 2, 23}, + { -2, 55, 46, -2, 15}, + { 3, -1, 21, 16, 41} +}; + +static const int8_t silk_ltp_filter2_taps[32][5] = { + { -6, 27, 61, 39, 5}, + {-11, 42, 88, 4, 1}, + { -2, 60, 65, 6, -4}, + { -1, -5, 73, 56, 1}, + { -9, 19, 94, 29, -9}, + { 0, 12, 99, 6, 4}, + { 8, -19, 102, 46, -13}, + { 3, 2, 13, 3, 2}, + { 9, -21, 84, 72, -18}, + {-11, 46, 104, -22, 8}, + { 18, 38, 48, 23, 0}, + {-16, 70, 83, -21, 11}, + { 5, -11, 117, 22, -8}, + { -6, 23, 117, -12, 3}, + { 3, -8, 95, 28, 4}, + {-10, 15, 77, 60, -15}, + { -1, 4, 124, 2, -4}, + { 3, 38, 84, 24, -25}, + { 2, 13, 42, 13, 31}, + { 21, -4, 56, 46, -1}, + { -1, 35, 79, -13, 19}, + { -7, 65, 88, -9, -14}, + { 20, 4, 81, 49, -29}, + { 20, 0, 75, 3, -17}, + { 5, -9, 44, 92, -8}, + { 1, -3, 22, 69, 31}, + { -6, 95, 41, -12, 5}, + { 39, 67, 16, -4, 1}, + { 0, -6, 120, 55, -36}, + {-13, 44, 122, 4, -24}, + { 81, 5, 11, 3, 7}, + { 2, 0, 9, 10, 88} +}; + +static const uint16_t silk_ltp_scale_factor[] = {15565, 12288, 8192}; + +static const uint8_t silk_shell_blocks[3][2] = { + { 5, 10}, // NB + { 8, 15}, // MB + {10, 20} // WB +}; + +static const uint8_t silk_quant_offset[2][2] = { /* (0.23) */ + {25, 60}, // Inactive or Unvoiced + { 8, 25} // Voiced +}; + +static const int silk_stereo_interp_len[3] = { + 64, 96, 128 +}; + +static inline void silk_stabilize_lsf(int16_t nlsf[16], int order, const uint16_t min_delta[17]) +{ + int pass, i; + for (pass = 0; pass < 20; pass++) { + int k, min_diff = 0; + for (i = 0; i < order+1; i++) { + int low = i != 0 ? nlsf[i-1] : 0; + int high = i != order ? nlsf[i] : 32768; + int diff = (high - low) - (min_delta[i]); + + if (diff < min_diff) { + min_diff = diff; + k = i; + + if (pass == 20) + break; + } + } + if (min_diff == 0) /* no issues; stabilized */ + return; + + /* wiggle one or two LSFs */ + if (k == 0) { + /* repel away from lower bound */ + nlsf[0] = min_delta[0]; + } else if (k == order) { + /* repel away from higher bound */ + nlsf[order-1] = 32768 - min_delta[order]; + } else { + /* repel away from current position */ + int min_center = 0, max_center = 32768, center_val; + + /* lower extent */ + for (i = 0; i < k; i++) + min_center += min_delta[i]; + min_center += min_delta[k] >> 1; + + /* upper extent */ + for (i = order; i > k; i--) + max_center -= min_delta[k]; + max_center -= min_delta[k] >> 1; + + /* move apart */ + center_val = nlsf[k - 1] + nlsf[k]; + center_val = (center_val >> 1) + (center_val & 1); // rounded divide by 2 + center_val = FFMIN(max_center, FFMAX(min_center, center_val)); + + nlsf[k - 1] = center_val - (min_delta[k] >> 1); + nlsf[k] = nlsf[k - 1] + min_delta[k]; + } + } + + /* resort to the fall-back method, the standard method for LSF stabilization */ + + /* sort; as the LSFs should be nearly sorted, use insertion sort */ + for (i = 1; i < order; i++) { + int j, value = nlsf[i]; + for (j = i - 1; j >= 0 && nlsf[j] > value; j--) + nlsf[j + 1] = nlsf[j]; + nlsf[j + 1] = value; + } + + /* push forwards to increase distance */ + if (nlsf[0] < min_delta[0]) + nlsf[0] = min_delta[0]; + for (i = 1; i < order; i++) + if (nlsf[i] < nlsf[i - 1] + min_delta[i]) + nlsf[i] = nlsf[i - 1] + min_delta[i]; + + /* push backwards to increase distance */ + if (nlsf[order-1] > 32768 - min_delta[order]) + nlsf[order-1] = 32768 - min_delta[order]; + for (i = order-2; i >= 0; i--) + if (nlsf[i] > nlsf[i + 1] - min_delta[i+1]) + nlsf[i] = nlsf[i + 1] - min_delta[i+1]; + + return; +} + +static inline int silk_is_lpc_stable(const int16_t lpc[16], int order) +{ + int k, j, DC_resp = 0; + int32_t lpc32[2][16]; // Q24 + int totalinvgain = 1 << 30; // 1.0 in Q30 + int32_t *row = lpc32[0], *prevrow; + + /* initialize the first row for the Levinson recursion */ + for (k = 0; k < order; k++) { + DC_resp += lpc[k]; + row[k] = lpc[k] * 4096; + } + + if (DC_resp >= 4096) + return 0; + + /* check if prediction gain pushes any coefficients too far */ + for (k = order - 1; 1; k--) { + int rc; // Q31; reflection coefficient + int gaindiv; // Q30; inverse of the gain (the divisor) + int gain; // gain for this reflection coefficient + int fbits; // fractional bits used for the gain + int error; // Q29; estimate of the error of our partial estimate of 1/gaindiv + + if (FFABS(row[k]) > 16773022) + return 0; + + rc = -(row[k] * 128); + gaindiv = (1 << 30) - MULH(rc, rc); + + totalinvgain = MULH(totalinvgain, gaindiv) << 2; + if (k == 0) + return (totalinvgain >= 107374); + + /* approximate 1.0/gaindiv */ + fbits = opus_ilog(gaindiv); + gain = ((1 << 29) - 1) / (gaindiv >> (fbits + 1 - 16)); // Q + error = (1 << 29) - MULL(gaindiv << (15 + 16 - fbits), gain, 16); + gain = ((gain << 16) + (error * gain >> 13)); + + /* switch to the next row of the LPC coefficients */ + prevrow = row; + row = lpc32[k & 1]; + + for (j = 0; j < k; j++) { + int x = prevrow[j] - ROUND_MULL(prevrow[k - j - 1], rc, 31); + row[j] = ROUND_MULL(x, gain, fbits); + } + } +} + +static void silk_lsp2poly(const int32_t lsp[16], int32_t pol[16], int half_order) +{ + int i, j; + + pol[0] = 65536; // 1.0 in Q16 + pol[1] = -lsp[0]; + + for (i = 1; i < half_order; i++) { + pol[i + 1] = pol[i - 1] * 2 - ROUND_MULL(lsp[2 * i], pol[i], 16); + for (j = i; j > 1; j--) + pol[j] += pol[j - 2] - ROUND_MULL(lsp[2 * i], pol[j - 1], 16); + + pol[1] -= lsp[2 * i]; + } +} + +static void silk_lsf2lpc(const int16_t nlsf[16], float lpcf[16], int order) +{ + int i, k; + int32_t lsp[16]; // Q17; 2*cos(LSF) + int32_t p[9], q[9]; // Q16 + int32_t lpc32[16]; // Q17 + int16_t lpc[16]; // Q12 + + /* convert the LSFs to LSPs, i.e. 2*cos(LSF) */ + for (k = 0; k < order; k++) { + int index = nlsf[k] >> 8; + int offset = nlsf[k] & 255; + int k2 = (order == 10) ? silk_lsf_ordering_nbmb[k] : silk_lsf_ordering_wb[k]; + + /* interpolate and round */ + lsp[k2] = silk_cosine[index] * 256; + lsp[k2] += (silk_cosine[index + 1] - silk_cosine[index]) * offset; + lsp[k2] = (lsp[k2] + 4) >> 3; + } + + silk_lsp2poly(lsp , p, order >> 1); + silk_lsp2poly(lsp + 1, q, order >> 1); + + /* reconstruct A(z) */ + for (k = 0; k < order>>1; k++) { + lpc32[k] = -p[k + 1] - p[k] - q[k + 1] + q[k]; + lpc32[order-k-1] = -p[k + 1] - p[k] + q[k + 1] - q[k]; + } + + /* limit the range of the LPC coefficients to each fit within an int16_t */ + for (i = 0; i < 10; i++) { + int j; + unsigned int maxabs = 0; + for (j = 0, k = 0; j < order; j++) { + unsigned int x = FFABS(lpc32[k]); + if (x > maxabs) { + maxabs = x; // Q17 + k = j; + } + } + + maxabs = (maxabs + 16) >> 5; // convert to Q12 + + if (maxabs > 32767) { + /* perform bandwidth expansion */ + unsigned int chirp, chirp_base; // Q16 + maxabs = FFMIN(maxabs, 163838); // anything above this overflows chirp's numerator + chirp_base = chirp = 65470 - ((maxabs - 32767) << 14) / ((maxabs * (k+1)) >> 2); + + for (k = 0; k < order; k++) { + lpc32[k] = ROUND_MULL(lpc32[k], chirp, 16); + chirp = (chirp_base * chirp + 32768) >> 16; + } + } else break; + } + + if (i == 10) { + /* time's up: just clamp */ + for (k = 0; k < order; k++) { + int x = (lpc32[k] + 16) >> 5; + lpc[k] = av_clip_int16(x); + lpc32[k] = lpc[k] << 5; // shortcut mandated by the spec; drops lower 5 bits + } + } else { + for (k = 0; k < order; k++) + lpc[k] = (lpc32[k] + 16) >> 5; + } + + /* if the prediction gain causes the LPC filter to become unstable, + apply further bandwidth expansion on the Q17 coefficients */ + for (i = 1; i <= 16 && !silk_is_lpc_stable(lpc, order); i++) { + unsigned int chirp, chirp_base; + chirp_base = chirp = 65536 - (1 << i); + + for (k = 0; k < order; k++) { + lpc32[k] = ROUND_MULL(lpc32[k], chirp, 16); + lpc[k] = (lpc32[k] + 16) >> 5; + chirp = (chirp_base * chirp + 32768) >> 16; + } + } + + for (i = 0; i < order; i++) + lpcf[i] = lpc[i] / 4096.0f; +} + +static inline void silk_decode_lpc(SilkContext *s, SilkFrame *frame, + OpusRangeCoder *rc, + float lpc_leadin[16], float lpc[16], + int *lpc_order, int *has_lpc_leadin, int voiced) +{ + int i; + int order; // order of the LP polynomial; 10 for NB/MB and 16 for WB + int8_t lsf_i1, lsf_i2[16]; // stage-1 and stage-2 codebook indices + int16_t lsf_res[16]; // residual as a Q10 value + int16_t nlsf[16]; // Q15 + + *lpc_order = order = s->wb ? 16 : 10; + + /* obtain LSF stage-1 and stage-2 indices */ + lsf_i1 = opus_rc_getsymbol(rc, silk_model_lsf_s1[s->wb][voiced]); + for (i = 0; i < order; i++) { + int index = s->wb ? silk_lsf_s2_model_sel_wb [lsf_i1][i] : + silk_lsf_s2_model_sel_nbmb[lsf_i1][i]; + lsf_i2[i] = opus_rc_getsymbol(rc, silk_model_lsf_s2[index]) - 4; + if (lsf_i2[i] == -4) + lsf_i2[i] -= opus_rc_getsymbol(rc, silk_model_lsf_s2_ext); + else if (lsf_i2[i] == 4) + lsf_i2[i] += opus_rc_getsymbol(rc, silk_model_lsf_s2_ext); + } + + /* reverse the backwards-prediction step */ + for (i = order - 1; i >= 0; i--) { + int qstep = s->wb ? 9830 : 11796; + + lsf_res[i] = lsf_i2[i] * 1024; + if (lsf_i2[i] < 0) lsf_res[i] += 102; + else if (lsf_i2[i] > 0) lsf_res[i] -= 102; + lsf_res[i] = (lsf_res[i] * qstep) >> 16; + + if (i + 1 < order) { + int weight = s->wb ? silk_lsf_pred_weights_wb [silk_lsf_weight_sel_wb [lsf_i1][i]][i] : + silk_lsf_pred_weights_nbmb[silk_lsf_weight_sel_nbmb[lsf_i1][i]][i]; + lsf_res[i] += (lsf_res[i+1] * weight) >> 8; + } + } + + /* reconstruct the NLSF coefficients from the supplied indices */ + for (i = 0; i < order; i++) { + const uint8_t * codebook = s->wb ? silk_lsf_codebook_wb [lsf_i1] : + silk_lsf_codebook_nbmb[lsf_i1]; + int cur, prev, next, weight_sq, weight, ipart, fpart, y, value; + + /* find the weight of the residual */ + /* TODO: precompute */ + cur = codebook[i]; + prev = i ? codebook[i - 1] : 0; + next = i + 1 < order ? codebook[i + 1] : 256; + weight_sq = (1024 / (cur - prev) + 1024 / (next - cur)) << 16; + + /* approximate square-root with mandated fixed-point arithmetic */ + ipart = opus_ilog(weight_sq); + fpart = (weight_sq >> (ipart-8)) & 127; + y = ((ipart & 1) ? 32768 : 46214) >> ((32 - ipart)>>1); + weight = y + ((213 * fpart * y) >> 16); + + value = cur * 128 + (lsf_res[i] * 16384) / weight; + nlsf[i] = av_clip(value, 0, 32767); + } + + /* stabilize the NLSF coefficients */ + silk_stabilize_lsf(nlsf, order, s->wb ? silk_lsf_min_spacing_wb : + silk_lsf_min_spacing_nbmb); + + /* produce an interpolation for the first 2 subframes, */ + /* and then convert both sets of NLSFs to LPC coefficients */ + *has_lpc_leadin = 0; + if (s->subframes == 4) { + int offset = opus_rc_getsymbol(rc, silk_model_lsf_interpolation_offset); + if (offset != 4 && frame->coded) { + *has_lpc_leadin = 1; + if (offset != 0) { + int16_t nlsf_leadin[16]; + for (i = 0; i < order; i++) + nlsf_leadin[i] = frame->nlsf[i] + + ((nlsf[i] - frame->nlsf[i]) * offset >> 2); + silk_lsf2lpc(nlsf_leadin, lpc_leadin, order); + } else /* avoid re-computation for a (roughly) 1-in-4 occurrence */ + memcpy(lpc_leadin, frame->lpc, 16 * sizeof(float)); + } else + offset = 4; + s->nlsf_interp_factor = offset; + + silk_lsf2lpc(nlsf, lpc, order); + } else { + s->nlsf_interp_factor = 4; + silk_lsf2lpc(nlsf, lpc, order); + } + + memcpy(frame->nlsf, nlsf, order * sizeof(nlsf[0])); + memcpy(frame->lpc, lpc, order * sizeof(lpc[0])); +} + +static inline void silk_count_children(OpusRangeCoder *rc, int model, int32_t total, + int32_t child[2]) +{ + if (total != 0) { + child[0] = opus_rc_getsymbol(rc, + silk_model_pulse_location[model] + (((total - 1 + 5) * (total - 1)) >> 1)); + child[1] = total - child[0]; + } else { + child[0] = 0; + child[1] = 0; + } +} + +static inline void silk_decode_excitation(SilkContext *s, OpusRangeCoder *rc, + float* excitationf, + int qoffset_high, int active, int voiced) +{ + int i; + uint32_t seed; + int shellblocks; + int ratelevel; + uint8_t pulsecount[20]; // total pulses in each shell block + uint8_t lsbcount[20] = {0}; // raw lsbits defined for each pulse in each shell block + int32_t excitation[320]; // Q23 + + /* excitation parameters */ + seed = opus_rc_getsymbol(rc, silk_model_lcg_seed); + shellblocks = silk_shell_blocks[s->bandwidth][s->subframes >> 2]; + ratelevel = opus_rc_getsymbol(rc, silk_model_exc_rate[voiced]); + + for (i = 0; i < shellblocks; i++) { + pulsecount[i] = opus_rc_getsymbol(rc, silk_model_pulse_count[ratelevel]); + if (pulsecount[i] == 17) { + while (pulsecount[i] == 17 && ++lsbcount[i] != 10) + pulsecount[i] = opus_rc_getsymbol(rc, silk_model_pulse_count[9]); + if (lsbcount[i] == 10) + pulsecount[i] = opus_rc_getsymbol(rc, silk_model_pulse_count[10]); + } + } + + /* decode pulse locations using PVQ */ + for (i = 0; i < shellblocks; i++) { + if (pulsecount[i] != 0) { + int a, b, c, d; + int32_t * location = excitation + 16*i; + int32_t branch[4][2]; + branch[0][0] = pulsecount[i]; + + /* unrolled tail recursion */ + for (a = 0; a < 1; a++) { + silk_count_children(rc, 0, branch[0][a], branch[1]); + for (b = 0; b < 2; b++) { + silk_count_children(rc, 1, branch[1][b], branch[2]); + for (c = 0; c < 2; c++) { + silk_count_children(rc, 2, branch[2][c], branch[3]); + for (d = 0; d < 2; d++) { + silk_count_children(rc, 3, branch[3][d], location); + location += 2; + } + } + } + } + } else + memset(excitation + 16*i, 0, 16*sizeof(int32_t)); + } + + /* decode least significant bits */ + for (i = 0; i < shellblocks << 4; i++) { + int bit; + for (bit = 0; bit < lsbcount[i >> 4]; bit++) + excitation[i] = (excitation[i] << 1) | + opus_rc_getsymbol(rc, silk_model_excitation_lsb); + } + + /* decode signs */ + for (i = 0; i < shellblocks << 4; i++) { + if (excitation[i] != 0) { + int sign = opus_rc_getsymbol(rc, silk_model_excitation_sign[active + + voiced][qoffset_high][FFMIN(pulsecount[i >> 4], 6)]); + if (sign == 0) + excitation[i] *= -1; + } + } + + /* assemble the excitation */ + for (i = 0; i < shellblocks << 4; i++) { + int value = excitation[i]; + excitation[i] = value * 256 | silk_quant_offset[voiced][qoffset_high]; + if (value < 0) excitation[i] += 20; + else if (value > 0) excitation[i] -= 20; + + /* invert samples pseudorandomly */ + seed = 196314165 * seed + 907633515; + if (seed & 0x80000000) + excitation[i] *= -1; + seed += value; + + excitationf[i] = excitation[i] / 8388608.0f; + } +} + +/** Maximum residual history according to 4.2.7.6.1 */ +#define SILK_MAX_LAG (288 + LTP_ORDER / 2) + +/** Order of the LTP filter */ +#define LTP_ORDER 5 + +static void silk_decode_frame(SilkContext *s, OpusRangeCoder *rc, + int frame_num, int channel, int coded_channels, int active, int active1) +{ + /* per frame */ + int voiced; // combines with active to indicate inactive, active, or active+voiced + int qoffset_high; + int order; // order of the LPC coefficients + float lpc_leadin[16], lpc_body[16], residual[SILK_MAX_LAG + SILK_HISTORY]; + int has_lpc_leadin; + float ltpscale; + + /* per subframe */ + struct { + float gain; + int pitchlag; + float ltptaps[5]; + } sf[4]; + + SilkFrame * const frame = s->frame + channel; + + int i; + + /* obtain stereo weights */ + if (coded_channels == 2 && channel == 0) { + int n, wi[2], ws[2], w[2]; + n = opus_rc_getsymbol(rc, silk_model_stereo_s1); + wi[0] = opus_rc_getsymbol(rc, silk_model_stereo_s2) + 3 * (n / 5); + ws[0] = opus_rc_getsymbol(rc, silk_model_stereo_s3); + wi[1] = opus_rc_getsymbol(rc, silk_model_stereo_s2) + 3 * (n % 5); + ws[1] = opus_rc_getsymbol(rc, silk_model_stereo_s3); + + for (i = 0; i < 2; i++) + w[i] = silk_stereo_weights[wi[i]] + + (((silk_stereo_weights[wi[i] + 1] - silk_stereo_weights[wi[i]]) * 6554) >> 16) + * (ws[i]*2 + 1); + + s->stereo_weights[0] = (w[0] - w[1]) / 8192.0; + s->stereo_weights[1] = w[1] / 8192.0; + + /* and read the mid-only flag */ + s->midonly = active1 ? 0 : opus_rc_getsymbol(rc, silk_model_mid_only); + } + + /* obtain frame type */ + if (!active) { + qoffset_high = opus_rc_getsymbol(rc, silk_model_frame_type_inactive); + voiced = 0; + } else { + int type = opus_rc_getsymbol(rc, silk_model_frame_type_active); + qoffset_high = type & 1; + voiced = type >> 1; + } + + /* obtain subframe quantization gains */ + for (i = 0; i < s->subframes; i++) { + int log_gain; //Q7 + int ipart, fpart, lingain; + + if (i == 0 && (frame_num == 0 || !frame->coded)) { + /* gain is coded absolute */ + int x = opus_rc_getsymbol(rc, silk_model_gain_highbits[active + voiced]); + log_gain = (x<<3) | opus_rc_getsymbol(rc, silk_model_gain_lowbits); + + if (frame->coded) + log_gain = FFMAX(log_gain, frame->log_gain - 16); + } else { + /* gain is coded relative */ + int delta_gain = opus_rc_getsymbol(rc, silk_model_gain_delta); + log_gain = av_clip(FFMAX((delta_gain<<1) - 16, + frame->log_gain + delta_gain - 4), 0, 63); + } + + frame->log_gain = log_gain; + + /* approximate 2**(x/128) with a Q7 (i.e. non-integer) input */ + log_gain = (log_gain * 0x1D1C71 >> 16) + 2090; + ipart = log_gain >> 7; + fpart = log_gain & 127; + lingain = (1 << ipart) + ((-174 * fpart * (128-fpart) >>16) + fpart) * ((1<> 7); + sf[i].gain = lingain / 65536.0f; + } + + /* obtain LPC filter coefficients */ + silk_decode_lpc(s, frame, rc, lpc_leadin, lpc_body, &order, &has_lpc_leadin, voiced); + + /* obtain pitch lags, if this is a voiced frame */ + if (voiced) { + int lag_absolute = (!frame_num || !frame->prev_voiced); + int primarylag; // primary pitch lag for the entire SILK frame + int ltpfilter; + const int8_t * offsets; + + if (!lag_absolute) { + int delta = opus_rc_getsymbol(rc, silk_model_pitch_delta); + if (delta) + primarylag = frame->primarylag + delta - 9; + else + lag_absolute = 1; + } + + if (lag_absolute) { + /* primary lag is coded absolute */ + int highbits, lowbits; + const uint16_t *model[] = { + silk_model_pitch_lowbits_nb, silk_model_pitch_lowbits_mb, + silk_model_pitch_lowbits_wb + }; + highbits = opus_rc_getsymbol(rc, silk_model_pitch_highbits); + lowbits = opus_rc_getsymbol(rc, model[s->bandwidth]); + + primarylag = silk_pitch_min_lag[s->bandwidth] + + highbits*silk_pitch_scale[s->bandwidth] + lowbits; + } + frame->primarylag = primarylag; + + if (s->subframes == 2) + offsets = (s->bandwidth == OPUS_BANDWIDTH_NARROWBAND) + ? silk_pitch_offset_nb10ms[opus_rc_getsymbol(rc, + silk_model_pitch_contour_nb10ms)] + : silk_pitch_offset_mbwb10ms[opus_rc_getsymbol(rc, + silk_model_pitch_contour_mbwb10ms)]; + else + offsets = (s->bandwidth == OPUS_BANDWIDTH_NARROWBAND) + ? silk_pitch_offset_nb20ms[opus_rc_getsymbol(rc, + silk_model_pitch_contour_nb20ms)] + : silk_pitch_offset_mbwb20ms[opus_rc_getsymbol(rc, + silk_model_pitch_contour_mbwb20ms)]; + + for (i = 0; i < s->subframes; i++) + sf[i].pitchlag = av_clip(primarylag + offsets[i], + silk_pitch_min_lag[s->bandwidth], + silk_pitch_max_lag[s->bandwidth]); + + /* obtain LTP filter coefficients */ + ltpfilter = opus_rc_getsymbol(rc, silk_model_ltp_filter); + for (i = 0; i < s->subframes; i++) { + int index, j; + const uint16_t *filter_sel[] = { + silk_model_ltp_filter0_sel, silk_model_ltp_filter1_sel, + silk_model_ltp_filter2_sel + }; + const int8_t (*filter_taps[])[5] = { + silk_ltp_filter0_taps, silk_ltp_filter1_taps, silk_ltp_filter2_taps + }; + index = opus_rc_getsymbol(rc, filter_sel[ltpfilter]); + for (j = 0; j < 5; j++) + sf[i].ltptaps[j] = filter_taps[ltpfilter][index][j] / 128.0f; + } + } + + /* obtain LTP scale factor */ + if (voiced && frame_num == 0) + ltpscale = silk_ltp_scale_factor[opus_rc_getsymbol(rc, + silk_model_ltp_scale_index)] / 16384.0f; + else ltpscale = 15565.0f/16384.0f; + + /* generate the excitation signal for the entire frame */ + silk_decode_excitation(s, rc, residual + SILK_MAX_LAG, qoffset_high, + active, voiced); + + /* skip synthesising the side channel if we want mono-only */ + if (s->output_channels == channel) + return; + + /* generate the output signal */ + for (i = 0; i < s->subframes; i++) { + const float * lpc_coeff = (i < 2 && has_lpc_leadin) ? lpc_leadin : lpc_body; + float *dst = frame->output + SILK_HISTORY + i * s->sflength; + float *resptr = residual + SILK_MAX_LAG + i * s->sflength; + float *lpc = frame->lpc_history + SILK_HISTORY + i * s->sflength; + float sum; + int j, k; + + if (voiced) { + int out_end; + float scale; + + if (i < 2 || s->nlsf_interp_factor == 4) { + out_end = -i * s->sflength; + scale = ltpscale; + } else { + out_end = -(i - 2) * s->sflength; + scale = 1.0f; + } + + /* when the LPC coefficients change, a re-whitening filter is used */ + /* to produce a residual that accounts for the change */ + for (j = - sf[i].pitchlag - LTP_ORDER/2; j < out_end; j++) { + sum = dst[j]; + for (k = 0; k < order; k++) + sum -= lpc_coeff[k] * dst[j - k - 1]; + resptr[j] = av_clipf(sum, -1.0f, 1.0f) * scale / sf[i].gain; + } + + if (out_end) { + float rescale = sf[i-1].gain / sf[i].gain; + for (j = out_end; j < 0; j++) + resptr[j] *= rescale; + } + + /* LTP synthesis */ + for (j = 0; j < s->sflength; j++) { + sum = resptr[j]; + for (k = 0; k < LTP_ORDER; k++) + sum += sf[i].ltptaps[k] * resptr[j - sf[i].pitchlag + LTP_ORDER/2 - k]; + resptr[j] = sum; + } + } + + /* LPC synthesis */ + for (j = 0; j < s->sflength; j++) { + sum = resptr[j] * sf[i].gain; + for (k = 1; k <= order; k++) + sum += lpc_coeff[k - 1] * lpc[j - k]; + + lpc[j] = sum; + dst[j] = av_clipf(sum, -1.0f, 1.0f); + } + } + + frame->prev_voiced = voiced; + memmove(frame->lpc_history, frame->lpc_history + s->flength, SILK_HISTORY * sizeof(float)); + memmove(frame->output, frame->output + s->flength, SILK_HISTORY * sizeof(float)); + + frame->coded = 1; +} + +static void silk_unmix_ms(SilkContext *s, float *l, float *r) +{ + float *mid = s->frame[0].output + SILK_HISTORY - s->flength; + float *side = s->frame[1].output + SILK_HISTORY - s->flength; + float w0_prev = s->prev_stereo_weights[0]; + float w1_prev = s->prev_stereo_weights[1]; + float w0 = s->stereo_weights[0]; + float w1 = s->stereo_weights[1]; + int n1 = silk_stereo_interp_len[s->bandwidth]; + int i; + + for (i = 0; i < n1; i++) { + float interp0 = w0_prev + i * (w0 - w0_prev) / n1; + float interp1 = w1_prev + i * (w1 - w1_prev) / n1; + float p0 = 0.25 * (mid[i - 2] + 2 * mid[i - 1] + mid[i]); + + l[i] = av_clipf((1 + interp1) * mid[i - 1] + side[i - 1] + interp0 * p0, -1.0, 1.0); + r[i] = av_clipf((1 - interp1) * mid[i - 1] - side[i - 1] - interp0 * p0, -1.0, 1.0); + } + + for (; i < s->flength; i++) { + float p0 = 0.25 * (mid[i - 2] + 2 * mid[i - 1] + mid[i]); + + l[i] = av_clipf((1 + w1) * mid[i - 1] + side[i - 1] + w0 * p0, -1.0, 1.0); + r[i] = av_clipf((1 - w1) * mid[i - 1] - side[i - 1] - w0 * p0, -1.0, 1.0); + } + + memcpy(s->prev_stereo_weights, s->stereo_weights, sizeof(s->stereo_weights)); +} + +static void silk_flush_frame(SilkFrame *frame) +{ + if (!frame->coded) + return; + + memset(frame->output, 0, sizeof(frame->output)); + memset(frame->lpc_history, 0, sizeof(frame->lpc_history)); + + memset(frame->lpc, 0, sizeof(frame->lpc)); + memset(frame->nlsf, 0, sizeof(frame->nlsf)); + + frame->log_gain = 0; + + frame->primarylag = 0; + frame->prev_voiced = 0; + frame->coded = 0; +} + +int ff_silk_decode_superframe(SilkContext *s, OpusRangeCoder *rc, + float *output[2], + enum OpusBandwidth bandwidth, + int coded_channels, + int duration_ms) +{ + int active[2][6], redundancy[2]; + int nb_frames, i, j; + + if (bandwidth > OPUS_BANDWIDTH_WIDEBAND || + coded_channels > 2 || duration_ms > 60) { + av_log(s->avctx, AV_LOG_ERROR, "Invalid parameters passed " + "to the SILK decoder.\n"); + return AVERROR(EINVAL); + } + + nb_frames = 1 + (duration_ms > 20) + (duration_ms > 40); + s->subframes = duration_ms / nb_frames / 5; // 5ms subframes + s->sflength = 20 * (bandwidth + 2); + s->flength = s->sflength * s->subframes; + s->bandwidth = bandwidth; + s->wb = bandwidth == OPUS_BANDWIDTH_WIDEBAND; + + /* make sure to flush the side channel when switching from mono to stereo */ + if (coded_channels > s->prev_coded_channels) + silk_flush_frame(&s->frame[1]); + s->prev_coded_channels = coded_channels; + + /* read the LP-layer header bits */ + for (i = 0; i < coded_channels; i++) { + for (j = 0; j < nb_frames; j++) + active[i][j] = opus_rc_p2model(rc, 1); + + redundancy[i] = opus_rc_p2model(rc, 1); + if (redundancy[i]) { + av_log(s->avctx, AV_LOG_ERROR, "LBRR frames present; this is unsupported\n"); + return AVERROR_PATCHWELCOME; + } + } + + for (i = 0; i < nb_frames; i++) { + for (j = 0; j < coded_channels && !s->midonly; j++) + silk_decode_frame(s, rc, i, j, coded_channels, active[j][i], active[1][i]); + + /* reset the side channel if it is not coded */ + if (s->midonly && s->frame[1].coded) + silk_flush_frame(&s->frame[1]); + + if (coded_channels == 1 || s->output_channels == 1) { + for (j = 0; j < s->output_channels; j++) { + memcpy(output[j] + i * s->flength, + s->frame[0].output + SILK_HISTORY - s->flength - 2, + s->flength * sizeof(float)); + } + } else { + silk_unmix_ms(s, output[0] + i * s->flength, output[1] + i * s->flength); + } + + s->midonly = 0; + } + + return nb_frames * s->flength; +} + +void ff_silk_free(SilkContext **ps) +{ + av_freep(ps); +} + +void ff_silk_flush(SilkContext *s) +{ + silk_flush_frame(&s->frame[0]); + silk_flush_frame(&s->frame[1]); + + memset(s->prev_stereo_weights, 0, sizeof(s->prev_stereo_weights)); +} + +int ff_silk_init(AVCodecContext *avctx, SilkContext **ps, int output_channels) +{ + SilkContext *s; + + 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; + + ff_silk_flush(s); + + *ps = s; + + return 0; +} -- cgit v1.2.3