Project import
diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..c7e7dd8 --- /dev/null +++ b/Makefile
@@ -0,0 +1,35 @@ +# +# Copyright (c) 2012 Nest Labs, Inc. +# All rights reserved. +# +# This document is the property of Nest Labs. It is considered +# confidential and proprietary information. +# +# This document may not be reproduced or transmitted in any form, +# in whole or in part, without the express written permission of +# Nest Labs. +# +# Description: +# This file is the make file for WebRTC G722 library +# + +include pre.mak + +.DEFAULT_GOAL := all + +ARCHIVES = g722 + +VPATH = src + +g722_SOURCES = g722_decode.c \ + g722_encode.c + +g722_INCLUDES = include + +g722_LDLIBS = \ + +g722_DEPLIBS = \ + +clean: + +include post.mak
diff --git a/include/g722_enc_dec.h b/include/g722_enc_dec.h new file mode 100644 index 0000000..163d298 --- /dev/null +++ b/include/g722_enc_dec.h
@@ -0,0 +1,150 @@ +/* + * SpanDSP - a series of DSP components for telephony + * + * g722.h - The ITU G.722 codec. + * + * Written by Steve Underwood <steveu@coppice.org> + * + * Copyright (C) 2005 Steve Underwood + * + * Despite my general liking of the GPL, I place my own contributions + * to this code in the public domain for the benefit of all mankind - + * even the slimy ones who might try to proprietize my work and use it + * to my detriment. + * + * Based on a single channel G.722 codec which is: + * + ***** Copyright (c) CMU 1993 ***** + * Computer Science, Speech Group + * Chengxiang Lu and Alex Hauptmann + * + * $Id: g722.h 48959 2006-12-25 06:42:15Z rizzo $ + */ + + +/*! \file */ + +#if !defined(_G722_H_) +#define _G722_H_ + +/*! \page g722_page G.722 encoding and decoding +\section g722_page_sec_1 What does it do? +The G.722 module is a bit exact implementation of the ITU G.722 specification for all three +specified bit rates - 64000bps, 56000bps and 48000bps. It passes the ITU tests. + +To allow fast and flexible interworking with narrow band telephony, the encoder and decoder +support an option for the linear audio to be an 8k samples/second stream. In this mode the +codec is considerably faster, and still fully compatible with wideband terminals using G.722. + +\section g722_page_sec_2 How does it work? +???. +*/ + +/* Format DAC12 is added to decode directly into samples suitable for + a 12-bit DAC using offset binary representation. */ + +enum +{ + G722_SAMPLE_RATE_8000 = 0x0001, + G722_PACKED = 0x0002, + G722_FORMAT_DAC12 = 0x0004, +}; + +#ifdef BUILD_FEATURE_DAC +#define NLAUDIO_CONVERT_SAMPLE(s) ((uint16_t)(((uint16_t)(s)+32768ul))>>4) +#endif + +#ifdef BUILD_FEATURE_DAC +#define NLDECOMPRESS_APPLY_GAIN(s,g) (((s) * (int32_t)(g)) >> 16) +#else +#define NLDECOMPRESS_APPLY_GAIN(s,g) (((int32_t)(s) * (int32_t)(g)) >> 16) +#endif + +#ifdef BUILD_FEATURE_DAC +#define NLDECOMPRESS_PREPROCESS_PCM_SAMPLE_WITH_GAIN(s,g) NLAUDIO_CONVERT_SAMPLE(NLDECOMPRESS_APPLY_GAIN((s),(g))) +#define NLDECOMPRESS_PREPROCESS_SAMPLE_WITH_GAIN(s,g) ((int16_t)NLDECOMPRESS_APPLY_GAIN((s),(g))) +#else +#define NLDECOMPRESS_PREPROCESS_PCM_SAMPLE_WITH_GAIN NLDECOMPRESS_PREPROCESS_SAMPLE_WITH_GAIN +#define NLDECOMPRESS_PREPROCESS_SAMPLE_WITH_GAIN(s,g) ((int16_t)(NLDECOMPRESS_APPLY_GAIN((s),(g)))) +#endif + +typedef 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 nb; + int det; +} g722_band_t; + +typedef struct +{ + /*! 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]; + + g722_band_t band[2]; + + unsigned int in_buffer; + int in_bits; + unsigned int out_buffer; + int out_bits; +} g722_encode_state_t; + +typedef struct +{ + /*! 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 decode to 8k samples/second */ + int eight_k; + /*! 6 for 48000kbps, 7 for 56000kbps, or 8 for 64000kbps. */ + int bits_per_sample; + /*! TRUE if offset binary for a 12-bit DAC */ + int dac_pcm; + + /*! Signal history for the QMF */ + int x[24]; + + g722_band_t band[2]; + + unsigned int in_buffer; + int in_bits; + unsigned int out_buffer; + int out_bits; +} g722_decode_state_t; + +#ifdef __cplusplus +extern "C" { +#endif + +g722_encode_state_t *g722_encode_init(g722_encode_state_t *s, unsigned int rate, int options); +int g722_encode_release(g722_encode_state_t *s); +int g722_encode(g722_encode_state_t *s, uint8_t g722_data[], const int16_t amp[], int len); + +g722_decode_state_t *g722_decode_init(g722_decode_state_t *s, unsigned int rate, int options); +int g722_decode_release(g722_decode_state_t *s); +uint32_t g722_decode(g722_decode_state_t *s, int16_t amp[], const uint8_t g722_data[], int len, uint16_t aGain); + +#ifdef __cplusplus +} +#endif + +#endif
diff --git a/include/g722_typedefs.h b/include/g722_typedefs.h new file mode 100644 index 0000000..d8977ff --- /dev/null +++ b/include/g722_typedefs.h
@@ -0,0 +1,112 @@ +/* + * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + +// This file contains platform-specific typedefs and defines. +// Much of it is derived from Chromium's build/build_config.h. + +#ifndef WEBRTC_TYPEDEFS_H_ +#define WEBRTC_TYPEDEFS_H_ + +// Processor architecture detection. For more info on what's defined, see: +// http://msdn.microsoft.com/en-us/library/b0084kay.aspx +// http://www.agner.org/optimize/calling_conventions.pdf +// or with gcc, run: "echo | gcc -E -dM -" +#if defined(_M_X64) || defined(__x86_64__) +#define WEBRTC_ARCH_X86_FAMILY +#define WEBRTC_ARCH_X86_64 +#define WEBRTC_ARCH_64_BITS +#define WEBRTC_ARCH_LITTLE_ENDIAN +#elif defined(__aarch64__) +#define WEBRTC_ARCH_64_BITS +#define WEBRTC_ARCH_LITTLE_ENDIAN +#elif defined(_M_IX86) || defined(__i386__) +#define WEBRTC_ARCH_X86_FAMILY +#define WEBRTC_ARCH_X86 +#define WEBRTC_ARCH_32_BITS +#define WEBRTC_ARCH_LITTLE_ENDIAN +#elif defined(__ARMEL__) +// TODO(ajm): We'd prefer to control platform defines here, but this is +// currently provided by the Android makefiles. Commented to avoid duplicate +// definition warnings. +//#define WEBRTC_ARCH_ARM +// TODO(ajm): Chromium uses the following two defines. Should we switch? +//#define WEBRTC_ARCH_ARM_FAMILY +//#define WEBRTC_ARCH_ARMEL +#define WEBRTC_ARCH_32_BITS +#define WEBRTC_ARCH_LITTLE_ENDIAN +#elif defined(__MIPSEL__) +#define WEBRTC_ARCH_32_BITS +#define WEBRTC_ARCH_LITTLE_ENDIAN +#elif defined(__pnacl__) +#define WEBRTC_ARCH_32_BITS +#define WEBRTC_ARCH_LITTLE_ENDIAN +#else +#error Please add support for your architecture in typedefs.h +#endif + +#if !(defined(WEBRTC_ARCH_LITTLE_ENDIAN) ^ defined(WEBRTC_ARCH_BIG_ENDIAN)) +#error Define either WEBRTC_ARCH_LITTLE_ENDIAN or WEBRTC_ARCH_BIG_ENDIAN +#endif + +#if (defined(WEBRTC_ARCH_X86_FAMILY) && !defined(__SSE2__)) || \ + (defined(WEBRTC_ARCH_ARM_V7) && !defined(WEBRTC_ARCH_ARM_NEON)) +#define WEBRTC_CPU_DETECTION +#endif + +#if !defined(_MSC_VER) +#include <stdint.h> +#else +// Define C99 equivalent types, since pre-2010 MSVC doesn't provide stdint.h. +typedef signed char int8_t; +typedef signed short int16_t; +typedef signed int int32_t; +typedef __int64 int64_t; +typedef unsigned char uint8_t; +typedef unsigned short uint16_t; +typedef unsigned int uint32_t; +typedef unsigned __int64 uint64_t; +#endif + +// Borrowed from Chromium's base/compiler_specific.h. +// Annotate a virtual method indicating it must be overriding a virtual +// method in the parent class. +// Use like: +// virtual void foo() OVERRIDE; +#if defined(_MSC_VER) +#define OVERRIDE override +#elif defined(__clang__) +// Clang defaults to C++03 and warns about using override. Squelch that. +// Intentionally no push/pop here so all users of OVERRIDE ignore the warning +// too. This is like passing -Wno-c++11-extensions, except that GCC won't die +// (because it won't see this pragma). +#pragma clang diagnostic ignored "-Wc++11-extensions" +#define OVERRIDE override +#elif defined(__GNUC__) && __cplusplus >= 201103 && \ + (__GNUC__ * 10000 + __GNUC_MINOR__ * 100) >= 40700 +// GCC 4.7 supports explicit virtual overrides when C++11 support is enabled. +#define OVERRIDE override +#else +#define OVERRIDE +#endif + +// Annotate a function indicating the caller must examine the return value. +// Use like: +// int foo() WARN_UNUSED_RESULT; +// TODO(ajm): Hack to avoid multiple definitions until the base/ of webrtc and +// libjingle are merged. +#if !defined(WARN_UNUSED_RESULT) +#if defined(__GNUC__) +#define WARN_UNUSED_RESULT __attribute__((warn_unused_result)) +#else +#define WARN_UNUSED_RESULT +#endif +#endif // WARN_UNUSED_RESULT + +#endif // WEBRTC_TYPEDEFS_H_
diff --git a/src/g722_decode.c b/src/g722_decode.c new file mode 100644 index 0000000..4d812ac --- /dev/null +++ b/src/g722_decode.c
@@ -0,0 +1,422 @@ +/* + * SpanDSP - a series of DSP components for telephony + * + * g722_decode.c - The ITU G.722 codec, decode part. + * + * Written by Steve Underwood <steveu@coppice.org> + * + * Copyright (C) 2005 Steve Underwood + * + * Despite my general liking of the GPL, I place my own contributions + * to this code in the public domain for the benefit of all mankind - + * even the slimy ones who might try to proprietize my work and use it + * to my detriment. + * + * Based in part on a single channel G.722 codec which is: + * + * Copyright (c) CMU 1993 + * Computer Science, Speech Group + * Chengxiang Lu and Alex Hauptmann + * + * $Id: g722_decode.c 194722 2009-05-15 17:59:08Z russell $ + */ + +/*! \file */ + +#include <stdio.h> +#include <string.h> +#include <inttypes.h> +#include <stdlib.h> + +#include "g722_typedefs.h" +#include "g722_enc_dec.h" + +#if !defined(FALSE) +#define FALSE 0 +#endif +#if !defined(TRUE) +#define TRUE (!FALSE) +#endif + +#define PACKED_INPUT (0) +#define BITS_PER_SAMPLE (8) + +#ifndef BUILD_FEATURE_G722_USE_INTRINSIC_SAT +static __inline int16_t __ssat16(int32_t amp) +{ + int16_t amp16; + + /* Hopefully this is optimised for the common case - not clipping */ + amp16 = (int16_t) amp; + if (amp == amp16) + return amp16; + if (amp > 0x7fff) + return 0x7fff; + return 0x8000; +} +/*- End of function --------------------------------------------------------*/ +#else +static __inline int16_t __ssat16( int32_t val) +{ + register int32_t res; + __asm volatile ( + "SSAT %0, #16, %1\n\t" + :"=r"(res) + :"r"(val) + :); + return (int16_t)res; +} +#endif + +/*- End of function --------------------------------------------------------*/ + +static void block4(g722_band_t *band, int d); + +static void block4(g722_band_t *band, int d) +{ + int wd1; + int wd2; + int wd3; + int i; + int sg[7]; + int ap1, ap2; + int sg0, sgi; + int sz; + + /* Block 4, RECONS */ + band->d[0] = d; + band->r[0] = __ssat16(band->s + d); + + /* Block 4, PARREC */ + band->p[0] = __ssat16(band->sz + d); + + /* Block 4, UPPOL2 */ + for (i = 0; i < 3; i++) + { + sg[i] = band->p[i] >> 15; + } + wd1 = __ssat16(band->a[1] << 2); + + wd2 = (sg[0] == sg[1]) ? -wd1 : wd1; + if (wd2 > 32767) + wd2 = 32767; + + ap2 = (sg[0] == sg[2]) ? 128 : -128; + ap2 += (wd2 >> 7); + ap2 += (band->a[2]*32512) >> 15; + if (ap2 > 12288) + ap2 = 12288; + else if (ap2 < -12288) + ap2 = -12288; + band->ap[2] = ap2; + + /* Block 4, UPPOL1 */ + sg[0] = band->p[0] >> 15; + sg[1] = band->p[1] >> 15; + wd1 = (sg[0] == sg[1]) ? 192 : -192; + wd2 = (band->a[1]*32640) >> 15; + + ap1 = __ssat16(wd1 + wd2); + wd3 = __ssat16(15360 - band->ap[2]); + if (ap1 > wd3) + ap1 = wd3; + else if (ap1 < -wd3) + ap1 = -wd3; + band->ap[1] = ap1; + + /* Block 4, UPZERO */ + /* Block 4, FILTEZ */ + wd1 = (d == 0) ? 0 : 128; + + sg0 = sg[0] = d >> 15; + for (i = 1; i < 7; i++) + { + sgi = band->d[i] >> 15; + wd2 = (sgi == sg0) ? wd1 : -wd1; + wd3 = (band->b[i]*32640) >> 15; + band->bp[i] = __ssat16(wd2 + wd3); + } + + /* Block 4, DELAYA */ + sz = 0; + for (i = 6; i > 0; i--) + { + int bi; + + band->d[i] = band->d[i - 1]; + bi = band->b[i] = band->bp[i]; + wd1 = __ssat16(band->d[i] + band->d[i]); + sz += (bi*wd1) >> 15; + } + band->sz = sz; + + for (i = 2; i > 0; i--) + { + band->r[i] = band->r[i - 1]; + band->p[i] = band->p[i - 1]; + band->a[i] = band->ap[i]; + } + + /* Block 4, FILTEP */ + wd1 = __ssat16(band->r[1] + band->r[1]); + wd1 = (band->a[1]*wd1) >> 15; + wd2 = __ssat16(band->r[2] + band->r[2]); + wd2 = (band->a[2]*wd2) >> 15; + band->sp = __ssat16(wd1 + wd2); + + /* Block 4, PREDIC */ + band->s = __ssat16(band->sp + band->sz); +} +/*- End of function --------------------------------------------------------*/ + +g722_decode_state_t *g722_decode_init(g722_decode_state_t *s, unsigned int rate, int options) +{ + if (s == NULL) + { +#ifdef G722_SUPPORT_MALLOC + if ((s = (g722_decode_state_t *) malloc(sizeof(*s))) == NULL) +#endif + return NULL; + } + memset(s, 0, sizeof(*s)); + if (rate == 48000) + s->bits_per_sample = 6; + else if (rate == 56000) + s->bits_per_sample = 7; + else + s->bits_per_sample = 8; + s->dac_pcm = options & G722_FORMAT_DAC12; + s->band[0].det = 32; + s->band[1].det = 8; + return s; +} +/*- End of function --------------------------------------------------------*/ + +int g722_decode_release(g722_decode_state_t *s) +{ + free(s); + return 0; +} +/*- End of function --------------------------------------------------------*/ + +static int16_t wl[8] = {-60, -30, 58, 172, 334, 538, 1198, 3042 }; +static int16_t rl42[16] = {0, 7, 6, 5, 4, 3, 2, 1, 7, 6, 5, 4, 3, 2, 1, 0 }; +static int16_t 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 +}; + +static int16_t wh[3] = {0, -214, 798}; +static int16_t rh2[4] = {2, 1, 2, 1}; +static int16_t qm2[4] = {-7408, -1616, 7408, 1616}; +static int16_t qm4[16] = +{ + 0, -20456, -12896, -8968, + -6288, -4240, -2584, -1200, + 20456, 12896, 8968, 6288, + 4240, 2584, 1200, 0 +}; +#if 0 +static const int qm5[32] = +{ + -280, -280, -23352, -17560, + -14120, -11664, -9752, -8184, + -6864, -5712, -4696, -3784, + -2960, -2208, -1520, -880, + 23352, 17560, 14120, 11664, + 9752, 8184, 6864, 5712, + 4696, 3784, 2960, 2208, + 1520, 880, 280, -280 +}; +#endif +static int16_t qm6[64] = +{ + -136, -136, -136, -136, + -24808, -21904, -19008, -16704, + -14984, -13512, -12280, -11192, + -10232, -9360, -8576, -7856, + -7192, -6576, -6000, -5456, + -4944, -4464, -4008, -3576, + -3168, -2776, -2400, -2032, + -1688, -1360, -1040, -728, + 24808, 21904, 19008, 16704, + 14984, 13512, 12280, 11192, + 10232, 9360, 8576, 7856, + 7192, 6576, 6000, 5456, + 4944, 4464, 4008, 3576, + 3168, 2776, 2400, 2032, + 1688, 1360, 1040, 728, + 432, 136, -432, -136 +}; +static int16_t qmf_coeffs_even[12] = +{ + 3, -11, 12, 32, -210, 951, 3876, -805, 362, -156, 53, -11, +}; +static int16_t qmf_coeffs_odd[12] = +{ + -11, 53, -156, 362, -805, 3876, 951, -210, 32, 12, -11, 3 +}; + +uint32_t g722_decode(g722_decode_state_t *s, int16_t amp[], const uint8_t g722_data[], int len, uint16_t gain) +{ + + int dlowt; + int rlow; + int ihigh; + int dhigh; + int rhigh; + int xout1; + int xout2; + int wd1; + int wd2; + int wd3; + int code; + uint32_t outlen; + int i; + int j; + + outlen = 0; + rhigh = 0; + + for (j = 0; j < len; ) + { +#if PACKED_INPUT == 1 + /* Unpack the code bits */ + if (s->in_bits < s->bits_per_sample) + { + s->in_buffer |= (g722_data[j++] << s->in_bits); + s->in_bits += 8; + } + code = s->in_buffer & ((1 << s->bits_per_sample) - 1); + s->in_buffer >>= s->bits_per_sample; + s->in_bits -= s->bits_per_sample; +#else + code = g722_data[j++]; +#endif + +#if BITS_PER_SAMPLE == 8 + wd1 = code & 0x3F; + ihigh = (code >> 6) & 0x03; + wd2 = qm6[wd1]; + wd1 >>= 2; +#elif BITS_PER_SAMPLE == 7 + wd1 = code & 0x1F; + ihigh = (code >> 5) & 0x03; + wd2 = qm5[wd1]; + wd1 >>= 1; +#elif BITS_PER_SAMPLE == 6 + wd1 = code & 0x0F; + ihigh = (code >> 4) & 0x03; + wd2 = qm4[wd1]; +#endif + /* Block 5L, LOW BAND INVQBL */ + wd2 = (s->band[0].det*wd2) >> 15; + /* Block 5L, RECONS */ + rlow = s->band[0].s + wd2; + /* Block 6L, LIMIT */ + + // ANDREA + // rlow=ssat(rlow,2<<14) + if (rlow > 16383) + { + rlow = 16383; + } + else if (rlow < -16384) + { + rlow = -16384; + } + + /* Block 2L, INVQAL */ + wd2 = qm4[wd1]; + dlowt = (s->band[0].det*wd2) >> 15; + + /* Block 3L, LOGSCL */ + wd2 = rl42[wd1]; + wd1 = (s->band[0].nb*127) >> 7; + wd1 += wl[wd2]; + if (wd1 < 0) + { + wd1 = 0; + } + else if (wd1 > 18432) + { + wd1 = 18432; + } + s->band[0].nb = wd1; + + /* Block 3L, SCALEL */ + wd1 = (s->band[0].nb >> 6) & 31; + wd2 = 8 - (s->band[0].nb >> 11); + wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2); + s->band[0].det = wd3 << 2; + + block4(&s->band[0], dlowt); + + /* Block 2H, INVQAH */ + wd2 = qm2[ihigh]; + dhigh = (s->band[1].det*wd2) >> 15; + /* Block 5H, RECONS */ + rhigh = dhigh + s->band[1].s; + /* Block 6H, LIMIT */ + + // ANDREA + // rhigh=ssat(rhigh,2<<14) + + if (rhigh > 16383) + rhigh = 16383; + else if (rhigh < -16384) + rhigh = -16384; + + /* Block 2H, INVQAH */ + wd2 = rh2[ihigh]; + wd1 = (s->band[1].nb*127) >> 7; + wd1 += wh[wd2]; + if (wd1 < 0) + wd1 = 0; + else if (wd1 > 22528) + wd1 = 22528; + s->band[1].nb = wd1; + + /* Block 3H, SCALEH */ + wd1 = (s->band[1].nb >> 6) & 31; + wd2 = 10 - (s->band[1].nb >> 11); + wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2); + s->band[1].det = wd3 << 2; + + block4(&s->band[1], dhigh); + + /* Apply the receive QMF */ + for (i = 0; i < 22; i++) + s->x[i] = s->x[i + 2]; + s->x[22] = rlow + rhigh; + s->x[23] = rlow - rhigh; + + // we should get PERF numbers for the following loop + xout1 = 0; + xout2 = 0; + for (i = 0; i < 12; i++) + { + xout2 += s->x[2*i] * qmf_coeffs_even[i]; + xout1 += s->x[2*i+1] * qmf_coeffs_odd[i]; + } + xout1 = NLDECOMPRESS_PREPROCESS_SAMPLE_WITH_GAIN((int16_t) __ssat16(xout1 >> 11), gain); + xout2 = NLDECOMPRESS_PREPROCESS_SAMPLE_WITH_GAIN((int16_t) __ssat16(xout2 >> 11), gain); + if (s->dac_pcm) + { + amp[outlen++] = ((int16_t) (xout1 >> 4) + 2048); + amp[outlen++] = ((int16_t) (xout2 >> 4) + 2048); + } + else + { + amp[outlen++] = xout1; + amp[outlen++] = xout2; + } + } + return outlen; +} +/*- End of function --------------------------------------------------------*/ +/*- End of file ------------------------------------------------------------*/
diff --git a/src/g722_encode.c b/src/g722_encode.c new file mode 100644 index 0000000..03da57f --- /dev/null +++ b/src/g722_encode.c
@@ -0,0 +1,437 @@ +/* + * SpanDSP - a series of DSP components for telephony + * + * g722_encode.c - The ITU G.722 codec, encode part. + * + * Written by Steve Underwood <steveu@coppice.org> + * + * Copyright (C) 2005 Steve Underwood + * + * All rights reserved. + * + * Despite my general liking of the GPL, I place my own contributions + * to this code in the public domain for the benefit of all mankind - + * even the slimy ones who might try to proprietize my work and use it + * to my detriment. + * + * Based on a single channel 64kbps only G.722 codec which is: + * + ***** Copyright (c) CMU 1993 ***** + * Computer Science, Speech Group + * Chengxiang Lu and Alex Hauptmann + * + * $Id: g722_encode.c,v 1.14 2006/07/07 16:37:49 steveu Exp $ + */ + +/*! \file */ + +#include <stdio.h> +#include <string.h> +#include <stdlib.h> + +#include "g722_typedefs.h" +#include "g722_enc_dec.h" + +#if !defined(FALSE) +#define FALSE 0 +#endif +#if !defined(TRUE) +#define TRUE (!FALSE) +#endif + +#define PACKED_OUTPUT (0) +#define BITS_PER_SAMPLE (8) + +#ifndef BUILD_FEATURE_G722_USE_INTRINSIC_SAT +static __inline int16_t saturate(int32_t amp) +{ + int16_t amp16; + + /* Hopefully this is optimised for the common case - not clipping */ + amp16 = (int16_t) amp; + if (amp == amp16) + return amp16; + if (amp > 0x7FFF) + return 0x7FFF; + return 0x8000; +} +#else +static __inline int16_t saturate(int32_t val) +{ + register int32_t res; + __asm volatile ( + "SSAT %0, #16, %1\n\t" + :"=r"(res) + :"r"(val) + :); + return (int16_t)res; +} +#endif +/*- End of function --------------------------------------------------------*/ + +static void block4(g722_band_t *band, int d) +{ + int wd1; + int wd2; + int wd3; + int i; + int sg[7]; + int ap1, ap2; + int sg0, sgi; + int sz; + + /* Block 4, RECONS */ + band->d[0] = d; + band->r[0] = saturate(band->s + d); + + /* Block 4, PARREC */ + band->p[0] = saturate(band->sz + d); + + /* Block 4, UPPOL2 */ + for (i = 0; i < 3; i++) + sg[i] = band->p[i] >> 15; + wd1 = saturate(band->a[1] << 2); + + wd2 = (sg[0] == sg[1]) ? -wd1 : wd1; + if (wd2 > 32767) + wd2 = 32767; + + ap2 = (wd2 >> 7) + ((sg[0] == sg[2]) ? 128 : -128); + ap2 += (band->a[2]*32512) >> 15; + if (ap2 > 12288) + ap2 = 12288; + else if (ap2 < -12288) + ap2 = -12288; + band->ap[2] = ap2; + + /* Block 4, UPPOL1 */ + sg[0] = band->p[0] >> 15; + sg[1] = band->p[1] >> 15; + wd1 = (sg[0] == sg[1]) ? 192 : -192; + wd2 = (band->a[1]*32640) >> 15; + + ap1 = saturate(wd1 + wd2); + wd3 = saturate(15360 - band->ap[2]); + if (ap1 > wd3) + ap1 = wd3; + else if (ap1 < -wd3) + ap1 = -wd3; + band->ap[1] = ap1; + + /* Block 4, UPZERO */ + /* Block 4, FILTEZ */ + wd1 = (d == 0) ? 0 : 128; + + sg0 = sg[0] = d >> 15; + for (i = 1; i < 7; i++) + { + sgi = band->d[i] >> 15; + wd2 = (sgi == sg0) ? wd1 : -wd1; + wd3 = (band->b[i]*32640) >> 15; + band->bp[i] = saturate(wd2 + wd3); + } + + /* Block 4, DELAYA */ + sz = 0; + for (i = 6; i > 0; i--) + { + int bi; + + band->d[i] = band->d[i - 1]; + bi = band->b[i] = band->bp[i]; + wd1 = saturate(band->d[i] + band->d[i]); + sz += (bi*wd1) >> 15; + } + band->sz = sz; + + for (i = 2; i > 0; i--) + { + band->r[i] = band->r[i - 1]; + band->p[i] = band->p[i - 1]; + band->a[i] = band->ap[i]; + } + + /* Block 4, FILTEP */ + wd1 = saturate(band->r[1] + band->r[1]); + wd1 = (band->a[1]*wd1) >> 15; + wd2 = saturate(band->r[2] + band->r[2]); + wd2 = (band->a[2]*wd2) >> 15; + band->sp = saturate(wd1 + wd2); + + /* Block 4, PREDIC */ + band->s = saturate(band->sp + band->sz); +} +/*- End of function --------------------------------------------------------*/ + +g722_encode_state_t *g722_encode_init(g722_encode_state_t *s, + unsigned int rate, int options) +{ + if (s == NULL) + { +#ifdef G722_SUPPORT_MALLOC + if ((s = (g722_encode_state_t *) malloc(sizeof(*s))) == NULL) +#endif + return NULL; + } + memset(s, 0, sizeof(*s)); + if (rate == 48000) + s->bits_per_sample = 6; + else if (rate == 56000) + s->bits_per_sample = 7; + else + s->bits_per_sample = 8; + s->band[0].det = 32; + s->band[1].det = 8; + return s; +} +/*- End of function --------------------------------------------------------*/ + +int g722_encode_release(g722_encode_state_t *s) +{ + free(s); + return 0; +} +/*- End of function --------------------------------------------------------*/ + +/* WebRtc, tlegrand: + * Only define the following if bit-exactness with reference implementation + * is needed. Will only have any effect if input signal is saturated. + */ +//#define RUN_LIKE_REFERENCE_G722 +#ifdef RUN_LIKE_REFERENCE_G722 +int16_t limitValues (int16_t rl) +{ + + int16_t yl; + + yl = (rl > 16383) ? 16383 : ((rl < -16384) ? -16384 : rl); + + return (yl); +} +/*- End of function --------------------------------------------------------*/ +#endif + +static int16_t 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 +}; +static int16_t 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 +}; +static int16_t 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 +}; +static int16_t wl[8] = +{ + -60, -30, 58, 172, 334, 538, 1198, 3042 +}; +static int16_t rl42[16] = +{ + 0, 7, 6, 5, 4, 3, 2, 1, 7, 6, 5, 4, 3, 2, 1, 0 +}; +static int16_t 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 +}; +static int16_t qm4[16] = +{ + 0, -20456, -12896, -8968, + -6288, -4240, -2584, -1200, + 20456, 12896, 8968, 6288, + 4240, 2584, 1200, 0 +}; +static int16_t qm2[4] = +{ + -7408, -1616, 7408, 1616 +}; +static int16_t qmf_coeffs[12] = +{ + 3, -11, 12, 32, -210, 951, 3876, -805, 362, -156, 53, -11, +}; +static int16_t ihn[3] = {0, 1, 0}; +static int16_t ihp[3] = {0, 3, 2}; +static int16_t wh[3] = {0, -214, 798}; +static int16_t rh2[4] = {2, 1, 2, 1}; + +int g722_encode(g722_encode_state_t *s, 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 (s->itu_test_mode) + { + xlow = + xhigh = amp[j++] >> 1; + } + else + { + { + /* Apply the transmit QMF */ + /* Shuffle the buffer down */ + for (i = 0; i < 22; i++) + s->x[i] = s->x[i + 2]; + s->x[22] = amp[j++]; + s->x[23] = amp[j++]; + + /* Discard every other QMF output */ + sumeven = 0; + sumodd = 0; + for (i = 0; i < 12; i++) + { + sumodd += s->x[2*i]*qmf_coeffs[i]; + sumeven += s->x[2*i + 1]*qmf_coeffs[11 - i]; + } + /* We shift by 12 to allow for the QMF filters (DC gain = 4096), plus 1 + to allow for us summing two filters, plus 1 to allow for the 15 bit + input to the G.722 algorithm. */ + xlow = (sumeven + sumodd) >> 14; + xhigh = (sumeven - sumodd) >> 14; + +#ifdef RUN_LIKE_REFERENCE_G722 + /* The following lines are only used to verify bit-exactness + * with reference implementation of G.722. Higher precision + * is achieved without limiting the values. + */ + xlow = limitValues(xlow); + xhigh = limitValues(xhigh); +#endif + } + } + /* Block 1L, SUBTRA */ + el = saturate(xlow - s->band[0].s); + + /* Block 1L, QUANTL */ + wd = (el >= 0) ? el : -(el + 1); + + for (i = 1; i < 30; i++) + { + wd1 = (q6[i]*s->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 = (s->band[0].det*wd2) >> 15; + + /* Block 3L, LOGSCL */ + il4 = rl42[ril]; + wd = (s->band[0].nb*127) >> 7; + s->band[0].nb = wd + wl[il4]; + if (s->band[0].nb < 0) + s->band[0].nb = 0; + else if (s->band[0].nb > 18432) + s->band[0].nb = 18432; + + /* Block 3L, SCALEL */ + wd1 = (s->band[0].nb >> 6) & 31; + wd2 = 8 - (s->band[0].nb >> 11); + wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2); + s->band[0].det = wd3 << 2; + + block4(&s->band[0], dlow); + { + int nb; + + /* Block 1H, SUBTRA */ + eh = saturate(xhigh - s->band[1].s); + + /* Block 1H, QUANTH */ + wd = (eh >= 0) ? eh : -(eh + 1); + wd1 = (564*s->band[1].det) >> 12; + mih = (wd >= wd1) ? 2 : 1; + ihigh = (eh < 0) ? ihn[mih] : ihp[mih]; + + /* Block 2H, INVQAH */ + wd2 = qm2[ihigh]; + dhigh = (s->band[1].det*wd2) >> 15; + + /* Block 3H, LOGSCH */ + ih2 = rh2[ihigh]; + wd = (s->band[1].nb*127) >> 7; + + nb = wd + wh[ih2]; + if (nb < 0) + nb = 0; + else if (nb > 22528) + nb = 22528; + s->band[1].nb = nb; + + /* Block 3H, SCALEH */ + wd1 = (s->band[1].nb >> 6) & 31; + wd2 = 10 - (s->band[1].nb >> 11); + wd3 = (wd2 < 0) ? (ilb[wd1] << -wd2) : (ilb[wd1] >> wd2); + s->band[1].det = wd3 << 2; + + block4(&s->band[1], dhigh); +#if BITS_PER_SAMPLE == 8 + code = ((ihigh << 6) | ilow); +#elif BITS_PER_SAMPLE == 7 + code = ((ihigh << 6) | ilow) >> 1; +#elif BITS_PER_SAMPLE == 6 + code = ((ihigh << 6) | ilow) >> 2; +#endif + } + +#if PACKED_OUTPUT == 1 + /* Pack the code bits */ + s->out_buffer |= (code << s->out_bits); + s->out_bits += s->bits_per_sample; + if (s->out_bits >= 8) + { + g722_data[g722_bytes++] = (uint8_t) (s->out_buffer & 0xFF); + s->out_bits -= 8; + s->out_buffer >>= 8; + } +#else + g722_data[g722_bytes++] = (uint8_t) code; +#endif + } + return g722_bytes; +} +/*- End of function --------------------------------------------------------*/ +/*- End of file ------------------------------------------------------------*/