From 7a16ccff06668b3b36492c218deec952dc17a460 Mon Sep 17 00:00:00 2001 From: f4exb Date: Sat, 16 Feb 2019 11:06:34 +0100 Subject: [PATCH] Added a G722 encoder --- sdrbase/CMakeLists.txt | 2 + sdrbase/audio/audiog722.cpp | 402 ++++++++++++++++++++++++++++++++++++ sdrbase/audio/audiog722.h | 111 ++++++++++ sdrbase/sdrbase.pro | 2 + 4 files changed, 517 insertions(+) create mode 100644 sdrbase/audio/audiog722.cpp create mode 100644 sdrbase/audio/audiog722.h diff --git a/sdrbase/CMakeLists.txt b/sdrbase/CMakeLists.txt index 0cfb3cfbd..5f9b4d307 100644 --- a/sdrbase/CMakeLists.txt +++ b/sdrbase/CMakeLists.txt @@ -8,6 +8,7 @@ set(sdrbase_SOURCES audio/audiodevicemanager.cpp audio/audiofifo.cpp audio/audiofilter.cpp + audio/audiog722.cpp audio/audiooutput.cpp audio/audioinput.cpp audio/audionetsink.cpp @@ -101,6 +102,7 @@ set(sdrbase_HEADERS audio/audiodevicemanager.h audio/audiofifo.h audio/audiofilter.h + audio/audiog722.h audio/audiooutput.h audio/audioinput.h audio/audionetsink.h diff --git a/sdrbase/audio/audiog722.cpp b/sdrbase/audio/audiog722.cpp new file mode 100644 index 000000000..ad3fa74c0 --- /dev/null +++ b/sdrbase/audio/audiog722.cpp @@ -0,0 +1,402 @@ +/////////////////////////////////////////////////////////////////////////////////// +// Copyright (C) 2019 F4EXB // +// written by Edouard Griffiths // +// // +// This program is free software; you can redistribute it and/or modify // +// it under the terms of the GNU General Public License as published by // +// the Free Software Foundation as version 3 of the License, or // +// // +// This program 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 General Public License V3 for more details. // +// // +// You should have received a copy of the GNU General Public License // +// along with this program. If not, see . // +/////////////////////////////////////////////////////////////////////////////////// + +#include +#include "audiog722.h" + +#define G722_SAMPLE_RATE_8000 1 +#define G722_PACKED 2 + +const int AudioG722::q6[32] = +{ + 0, 35, 72, 110, 150, 190, 233, 276, + 323, 370, 422, 473, 530, 587, 650, 714, + 786, 858, 940, 1023, 1121, 1219, 1339, 1458, + 1612, 1765, 1980, 2195, 2557, 2919, 0, 0 +}; +const int AudioG722::iln[32] = +{ + 0, 63, 62, 31, 30, 29, 28, 27, + 26, 25, 24, 23, 22, 21, 20, 19, + 18, 17, 16, 15, 14, 13, 12, 11, + 10, 9, 8, 7, 6, 5, 4, 0 +}; +const int AudioG722::ilp[32] = +{ + 0, 61, 60, 59, 58, 57, 56, 55, + 54, 53, 52, 51, 50, 49, 48, 47, + 46, 45, 44, 43, 42, 41, 40, 39, + 38, 37, 36, 35, 34, 33, 32, 0 +}; +const int AudioG722::wl[8] = +{ + -60, -30, 58, 172, 334, 538, 1198, 3042 +}; +const int AudioG722::rl42[16] = +{ + 0, 7, 6, 5, 4, 3, 2, 1, 7, 6, 5, 4, 3, 2, 1, 0 +}; +const int AudioG722::ilb[32] = +{ + 2048, 2093, 2139, 2186, 2233, 2282, 2332, + 2383, 2435, 2489, 2543, 2599, 2656, 2714, + 2774, 2834, 2896, 2960, 3025, 3091, 3158, + 3228, 3298, 3371, 3444, 3520, 3597, 3676, + 3756, 3838, 3922, 4008 +}; +const int AudioG722::qm4[16] = +{ + 0, -20456, -12896, -8968, + -6288, -4240, -2584, -1200, + 20456, 12896, 8968, 6288, + 4240, 2584, 1200, 0 +}; +const int AudioG722::qm2[4] = +{ + -7408, -1616, 7408, 1616 +}; +const int AudioG722::qmf_coeffs[12] = +{ + 3, -11, 12, 32, -210, 951, 3876, -805, 362, -156, 53, -11, +}; +const int AudioG722::ihn[3] = {0, 1, 0}; +const int AudioG722::ihp[3] = {0, 3, 2}; +const int AudioG722::wh[3] = {0, -214, 798}; +const int AudioG722::rh2[4] = {2, 1, 2, 1}; + + +AudioG722::g722_encode_state::g722_encode_state() +{ + init(64000, 0); +} + +void AudioG722::g722_encode_state::init(int rate, int options) +{ + itu_test_mode = 0; + std::fill(x, x+24, 0); + in_buffer = 0; + in_bits = 0; + out_buffer = 0; + out_bits = 0; + + if (rate == 48000) { + bits_per_sample = 6; + } else if (rate == 56000) { + bits_per_sample = 7; + } else { + bits_per_sample = 8; + } + + + if ((options & G722_SAMPLE_RATE_8000)) { + eight_k = 1; + } else { + eight_k = 0; + } + + if ((options & G722_PACKED) && bits_per_sample != 8) { + packed = 1; + } else { + packed = 0; + } + + band[0].det = 32; + band[1].det = 8; +} + +AudioG722::AudioG722() +{} + +AudioG722::~AudioG722() +{} + +void AudioG722::init(int rate, int options) +{ + state.init(rate, options); +} + +void AudioG722::block4(int band, int d) +{ + int wd1; + int wd2; + int wd3; + int i; + + /* Block 4, RECONS */ + state.band[band].d[0] = d; + state.band[band].r[0] = saturate(state.band[band].s + d); + + /* Block 4, PARREC */ + state.band[band].p[0] = saturate(state.band[band].sz + d); + + /* Block 4, UPPOL2 */ + for (i = 0; i < 3; i++) { + state.band[band].sg[i] = state.band[band].p[i] >> 15; + } + + wd1 = saturate(state.band[band].a[1] << 2); + wd2 = (state.band[band].sg[0] == state.band[band].sg[1]) ? -wd1 : wd1; + + if (wd2 > 32767) { + wd2 = 32767; + } + + wd3 = (wd2 >> 7) + ((state.band[band].sg[0] == state.band[band].sg[2]) ? 128 : -128); + wd3 += (state.band[band].a[2]*32512) >> 15; + + if (wd3 > 12288) { + wd3 = 12288; + } else if (wd3 < -12288) { + wd3 = -12288; + } + + state.band[band].ap[2] = wd3; + + /* Block 4, UPPOL1 */ + state.band[band].sg[0] = state.band[band].p[0] >> 15; + state.band[band].sg[1] = state.band[band].p[1] >> 15; + wd1 = (state.band[band].sg[0] == state.band[band].sg[1]) ? 192 : -192; + wd2 = (state.band[band].a[1]*32640) >> 15; + + state.band[band].ap[1] = saturate(wd1 + wd2); + wd3 = saturate(15360 - state.band[band].ap[2]); + + if (state.band[band].ap[1] > wd3) { + state.band[band].ap[1] = wd3; + } else if (state.band[band].ap[1] < -wd3) { + state.band[band].ap[1] = -wd3; + } + + /* Block 4, UPZERO */ + wd1 = (d == 0) ? 0 : 128; + state.band[band].sg[0] = d >> 15; + + for (i = 1; i < 7; i++) + { + state.band[band].sg[i] = state.band[band].d[i] >> 15; + wd2 = (state.band[band].sg[i] == state.band[band].sg[0]) ? wd1 : -wd1; + wd3 = (state.band[band].b[i]*32640) >> 15; + state.band[band].bp[i] = saturate(wd2 + wd3); + } + + /* Block 4, DELAYA */ + for (i = 6; i > 0; i--) + { + state.band[band].d[i] = state.band[band].d[i - 1]; + state.band[band].b[i] = state.band[band].bp[i]; + } + + for (i = 2; i > 0; i--) + { + state.band[band].r[i] = state.band[band].r[i - 1]; + state.band[band].p[i] = state.band[band].p[i - 1]; + state.band[band].a[i] = state.band[band].ap[i]; + } + + /* Block 4, FILTEP */ + wd1 = saturate(state.band[band].r[1] + state.band[band].r[1]); + wd1 = (state.band[band].a[1]*wd1) >> 15; + wd2 = saturate(state.band[band].r[2] + state.band[band].r[2]); + wd2 = (state.band[band].a[2]*wd2) >> 15; + state.band[band].sp = saturate(wd1 + wd2); + + /* Block 4, FILTEZ */ + state.band[band].sz = 0; + + for (i = 6; i > 0; i--) + { + wd1 = saturate(state.band[band].d[i] + state.band[band].d[i]); + state.band[band].sz += (state.band[band].b[i]*wd1) >> 15; + } + + state.band[band].sz = saturate(state.band[band].sz); + + /* Block 4, PREDIC */ + state.band[band].s = saturate(state.band[band].sp + state.band[band].sz); +} + +int AudioG722::encode(uint8_t g722_data[], const int16_t amp[], int len) +{ + int dlow; + int dhigh; + int el; + int wd; + int wd1; + int ril; + int wd2; + int il4; + int ih2; + int wd3; + int eh; + int mih; + int i; + int j; + /* Low and high band PCM from the QMF */ + int xlow; + int xhigh; + int g722_bytes; + /* Even and odd tap accumulators */ + int sumeven; + int sumodd; + int ihigh; + int ilow; + int code; + + g722_bytes = 0; + xhigh = 0; + + for (j = 0; j < len; ) + { + if (state.itu_test_mode) + { + xlow = + xhigh = amp[j++] >> 1; + } + else + { + if (state.eight_k) + { + xlow = amp[j++] >> 1; + } + else + { + /* Apply the transmit QMF */ + /* Shuffle the buffer down */ + for (i = 0; i < 22; i++) { + state.x[i] = state.x[i + 2]; + } + + state.x[22] = amp[j++]; + state.x[23] = amp[j++]; + + /* Discard every other QMF output */ + sumeven = 0; + sumodd = 0; + + for (i = 0; i < 12; i++) + { + sumodd += state.x[2*i]*qmf_coeffs[i]; + sumeven += state.x[2*i + 1]*qmf_coeffs[11 - i]; + } + + xlow = (sumeven + sumodd) >> 14; + xhigh = (sumeven - sumodd) >> 14; + } + } + /* Block 1L, SUBTRA */ + el = saturate(xlow - state.band[0].s); + + /* Block 1L, QUANTL */ + wd = (el >= 0) ? el : -(el + 1); + + for (i = 1; i < 30; i++) + { + wd1 = (q6[i]*state.band[0].det) >> 12; + + if (wd < wd1) { + break; + } + } + + ilow = (el < 0) ? iln[i] : ilp[i]; + + /* Block 2L, INVQAL */ + ril = ilow >> 2; + wd2 = qm4[ril]; + dlow = (state.band[0].det*wd2) >> 15; + + /* Block 3L, LOGSCL */ + il4 = rl42[ril]; + wd = (state.band[0].nb*127) >> 7; + state.band[0].nb = wd + wl[il4]; + + if (state.band[0].nb < 0) { + state.band[0].nb = 0; + } else if (state.band[0].nb > 18432) { + state.band[0].nb = 18432; + } + + /* Block 3L, SCALEL */ + wd1 = (state.band[0].nb >> 6) & 31; + wd2 = 8 - (state.band[0].nb >> 11); + wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2); + state.band[0].det = wd3 << 2; + + block4(0, dlow); + + if (state.eight_k) + { + /* Just leave the high bits as zero */ + code = (0xC0 | ilow) >> (8 - state.bits_per_sample); + } + else + { + /* Block 1H, SUBTRA */ + eh = saturate(xhigh - state.band[1].s); + + /* Block 1H, QUANTH */ + wd = (eh >= 0) ? eh : -(eh + 1); + wd1 = (564*state.band[1].det) >> 12; + mih = (wd >= wd1) ? 2 : 1; + ihigh = (eh < 0) ? ihn[mih] : ihp[mih]; + + /* Block 2H, INVQAH */ + wd2 = qm2[ihigh]; + dhigh = (state.band[1].det*wd2) >> 15; + + /* Block 3H, LOGSCH */ + ih2 = rh2[ihigh]; + wd = (state.band[1].nb*127) >> 7; + state.band[1].nb = wd + wh[ih2]; + + if (state.band[1].nb < 0) { + state.band[1].nb = 0; + } else if (state.band[1].nb > 22528) { + state.band[1].nb = 22528; + } + + /* Block 3H, SCALEH */ + wd1 = (state.band[1].nb >> 6) & 31; + wd2 = 10 - (state.band[1].nb >> 11); + wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2); + state.band[1].det = wd3 << 2; + + block4(1, dhigh); + code = ((ihigh << 6) | ilow) >> (8 - state.bits_per_sample); + } + + if (state.packed) + { + /* Pack the code bits */ + state.out_buffer |= (code << state.out_bits); + state.out_bits += state.bits_per_sample; + + if (state.out_bits >= 8) + { + g722_data[g722_bytes++] = (uint8_t) (state.out_buffer & 0xFF); + state.out_bits -= 8; + state.out_buffer >>= 8; + } + } + else + { + g722_data[g722_bytes++] = (uint8_t) code; + } + } + + return g722_bytes; +} diff --git a/sdrbase/audio/audiog722.h b/sdrbase/audio/audiog722.h new file mode 100644 index 000000000..ee88e264c --- /dev/null +++ b/sdrbase/audio/audiog722.h @@ -0,0 +1,111 @@ +/////////////////////////////////////////////////////////////////////////////////// +// Copyright (C) 2019 F4EXB // +// written by Edouard Griffiths // +// // +// This program is free software; you can redistribute it and/or modify // +// it under the terms of the GNU General Public License as published by // +// the Free Software Foundation as version 3 of the License, or // +// // +// This program 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 General Public License V3 for more details. // +// // +// You should have received a copy of the GNU General Public License // +// along with this program. If not, see . // +/////////////////////////////////////////////////////////////////////////////////// + +#ifndef SDRBASE_AUDIO_AUDIOG722_H_ +#define SDRBASE_AUDIO_AUDIOG722_H_ + +#include +#include "export.h" + +class SDRBASE_API AudioG722 +{ +public: + AudioG722(); + ~AudioG722(); + void init(int rate, int options); + int encode(uint8_t g722_data[], const int16_t amp[], int len); + +private: + struct g722_encode_state + { + /*! TRUE if the operating in the special ITU test mode, with the band split filters + disabled. */ + int itu_test_mode; + /*! TRUE if the G.722 data is packed */ + int packed; + /*! TRUE if encode from 8k samples/second */ + int eight_k; + /*! 6 for 48000kbps, 7 for 56000kbps, or 8 for 64000kbps. */ + int bits_per_sample; + + /*! Signal history for the QMF */ + int x[24]; + + struct + { + int s; + int sp; + int sz; + int r[3]; + int a[3]; + int ap[3]; + int p[3]; + int d[7]; + int b[7]; + int bp[7]; + int sg[7]; + int nb; + int det; + } band[2]; + + unsigned int in_buffer; + int in_bits; + unsigned int out_buffer; + int out_bits; + + g722_encode_state(); + void init(int rate, int options); + }; + + __inline__ int16_t saturate(int32_t amp) + { + int16_t amp16; + + /* Hopefully this is optimized for the common case - not clipping */ + amp16 = (int16_t) amp; + if (amp == amp16) { + return amp16; + } + + if (amp > INT16_MAX) { + return INT16_MAX; + } + + return INT16_MIN; + } + + void block4(int band, int d); + + g722_encode_state state; + + static const int q6[32]; + static const int iln[32]; + static const int ilp[32]; + static const int wl[8]; + static const int rl42[16]; + static const int ilb[32]; + static const int qm4[16]; + static const int qm2[4]; + static const int qmf_coeffs[12]; + static const int ihn[3]; + static const int ihp[3]; + static const int wh[3]; + static const int rh2[4]; +}; + + +#endif /* SDRBASE_AUDIO_AUDIOG722_H_ */ diff --git a/sdrbase/sdrbase.pro b/sdrbase/sdrbase.pro index 3538849e2..e06c4b82a 100644 --- a/sdrbase/sdrbase.pro +++ b/sdrbase/sdrbase.pro @@ -57,6 +57,7 @@ SOURCES += audio/audiodevicemanager.cpp\ audio/audiocompressor.cpp\ audio/audiofifo.cpp\ audio/audiofilter.cpp\ + audio/audiog722.cpp\ audio/audiooutput.cpp\ audio/audioinput.cpp\ audio/audionetsink.cpp\ @@ -136,6 +137,7 @@ HEADERS += audio/audiodevicemanager.h\ audio/audiocompressor.h\ audio/audiofifo.h\ audio/audiofilter.h\ + audio/audiog722.h\ audio/audiooutput.h\ audio/audioinput.h\ audio/audionetsink.h\