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/*
*
* Bluetooth low-complexity, subband codec (SBC) library
*
* Copyright (C) 2004-2009 Marcel Holtmann <marcel@holtmann.org>
* Copyright (C) 2004-2005 Henryk Ploetz <henryk@ploetzli.ch>
* Copyright (C) 2005-2006 Brad Midgley <bmidgley@xmission.com>
*
*
* This library 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.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include <stdint.h>
#include <limits.h>
#include "sbc.h"
#include "sbc_math.h"
#include "sbc_tables.h"
#include "sbc_primitives.h"
#include "sbc_primitives_mmx.h"
#include "sbc_primitives_neon.h"
/*
* A reference C code of analysis filter with SIMD-friendly tables
* reordering and code layout. This code can be used to develop platform
* specific SIMD optimizations. Also it may be used as some kind of test
* for compiler autovectorization capabilities (who knows, if the compiler
* is very good at this stuff, hand optimized assembly may be not strictly
* needed for some platform).
*
* Note: It is also possible to make a simple variant of analysis filter,
* which needs only a single constants table without taking care about
* even/odd cases. This simple variant of filter can be implemented without
* input data permutation. The only thing that would be lost is the
* possibility to use pairwise SIMD multiplications. But for some simple
* CPU cores without SIMD extensions it can be useful. If anybody is
* interested in implementing such variant of a filter, sourcecode from
* bluez versions 4.26/4.27 can be used as a reference and the history of
* the changes in git repository done around that time may be worth checking.
*/
static inline void sbc_analyze_four_simd(const int16_t *in, int32_t *out,
const FIXED_T *consts)
{
FIXED_A t1[4];
FIXED_T t2[4];
int hop = 0;
/* rounding coefficient */
t1[0] = t1[1] = t1[2] = t1[3] =
(FIXED_A) 1 << (SBC_PROTO_FIXED4_SCALE - 1);
/* low pass polyphase filter */
for (hop = 0; hop < 40; hop += 8) {
t1[0] += (FIXED_A) in[hop] * consts[hop];
t1[0] += (FIXED_A) in[hop + 1] * consts[hop + 1];
t1[1] += (FIXED_A) in[hop + 2] * consts[hop + 2];
t1[1] += (FIXED_A) in[hop + 3] * consts[hop + 3];
t1[2] += (FIXED_A) in[hop + 4] * consts[hop + 4];
t1[2] += (FIXED_A) in[hop + 5] * consts[hop + 5];
t1[3] += (FIXED_A) in[hop + 6] * consts[hop + 6];
t1[3] += (FIXED_A) in[hop + 7] * consts[hop + 7];
}
/* scaling */
t2[0] = t1[0] >> SBC_PROTO_FIXED4_SCALE;
t2[1] = t1[1] >> SBC_PROTO_FIXED4_SCALE;
t2[2] = t1[2] >> SBC_PROTO_FIXED4_SCALE;
t2[3] = t1[3] >> SBC_PROTO_FIXED4_SCALE;
/* do the cos transform */
t1[0] = (FIXED_A) t2[0] * consts[40 + 0];
t1[0] += (FIXED_A) t2[1] * consts[40 + 1];
t1[1] = (FIXED_A) t2[0] * consts[40 + 2];
t1[1] += (FIXED_A) t2[1] * consts[40 + 3];
t1[2] = (FIXED_A) t2[0] * consts[40 + 4];
t1[2] += (FIXED_A) t2[1] * consts[40 + 5];
t1[3] = (FIXED_A) t2[0] * consts[40 + 6];
t1[3] += (FIXED_A) t2[1] * consts[40 + 7];
t1[0] += (FIXED_A) t2[2] * consts[40 + 8];
t1[0] += (FIXED_A) t2[3] * consts[40 + 9];
t1[1] += (FIXED_A) t2[2] * consts[40 + 10];
t1[1] += (FIXED_A) t2[3] * consts[40 + 11];
t1[2] += (FIXED_A) t2[2] * consts[40 + 12];
t1[2] += (FIXED_A) t2[3] * consts[40 + 13];
t1[3] += (FIXED_A) t2[2] * consts[40 + 14];
t1[3] += (FIXED_A) t2[3] * consts[40 + 15];
out[0] = t1[0] >>
(SBC_COS_TABLE_FIXED4_SCALE - SCALE_OUT_BITS);
out[1] = t1[1] >>
(SBC_COS_TABLE_FIXED4_SCALE - SCALE_OUT_BITS);
out[2] = t1[2] >>
(SBC_COS_TABLE_FIXED4_SCALE - SCALE_OUT_BITS);
out[3] = t1[3] >>
(SBC_COS_TABLE_FIXED4_SCALE - SCALE_OUT_BITS);
}
static inline void sbc_analyze_eight_simd(const int16_t *in, int32_t *out,
const FIXED_T *consts)
{
FIXED_A t1[8];
FIXED_T t2[8];
int i, hop;
/* rounding coefficient */
t1[0] = t1[1] = t1[2] = t1[3] = t1[4] = t1[5] = t1[6] = t1[7] =
(FIXED_A) 1 << (SBC_PROTO_FIXED8_SCALE-1);
/* low pass polyphase filter */
for (hop = 0; hop < 80; hop += 16) {
t1[0] += (FIXED_A) in[hop] * consts[hop];
t1[0] += (FIXED_A) in[hop + 1] * consts[hop + 1];
t1[1] += (FIXED_A) in[hop + 2] * consts[hop + 2];
t1[1] += (FIXED_A) in[hop + 3] * consts[hop + 3];
t1[2] += (FIXED_A) in[hop + 4] * consts[hop + 4];
t1[2] += (FIXED_A) in[hop + 5] * consts[hop + 5];
t1[3] += (FIXED_A) in[hop + 6] * consts[hop + 6];
t1[3] += (FIXED_A) in[hop + 7] * consts[hop + 7];
t1[4] += (FIXED_A) in[hop + 8] * consts[hop + 8];
t1[4] += (FIXED_A) in[hop + 9] * consts[hop + 9];
t1[5] += (FIXED_A) in[hop + 10] * consts[hop + 10];
t1[5] += (FIXED_A) in[hop + 11] * consts[hop + 11];
t1[6] += (FIXED_A) in[hop + 12] * consts[hop + 12];
t1[6] += (FIXED_A) in[hop + 13] * consts[hop + 13];
t1[7] += (FIXED_A) in[hop + 14] * consts[hop + 14];
t1[7] += (FIXED_A) in[hop + 15] * consts[hop + 15];
}
/* scaling */
t2[0] = t1[0] >> SBC_PROTO_FIXED8_SCALE;
t2[1] = t1[1] >> SBC_PROTO_FIXED8_SCALE;
t2[2] = t1[2] >> SBC_PROTO_FIXED8_SCALE;
t2[3] = t1[3] >> SBC_PROTO_FIXED8_SCALE;
t2[4] = t1[4] >> SBC_PROTO_FIXED8_SCALE;
t2[5] = t1[5] >> SBC_PROTO_FIXED8_SCALE;
t2[6] = t1[6] >> SBC_PROTO_FIXED8_SCALE;
t2[7] = t1[7] >> SBC_PROTO_FIXED8_SCALE;
/* do the cos transform */
t1[0] = t1[1] = t1[2] = t1[3] = t1[4] = t1[5] = t1[6] = t1[7] = 0;
for (i = 0; i < 4; i++) {
t1[0] += (FIXED_A) t2[i * 2 + 0] * consts[80 + i * 16 + 0];
t1[0] += (FIXED_A) t2[i * 2 + 1] * consts[80 + i * 16 + 1];
t1[1] += (FIXED_A) t2[i * 2 + 0] * consts[80 + i * 16 + 2];
t1[1] += (FIXED_A) t2[i * 2 + 1] * consts[80 + i * 16 + 3];
t1[2] += (FIXED_A) t2[i * 2 + 0] * consts[80 + i * 16 + 4];
t1[2] += (FIXED_A) t2[i * 2 + 1] * consts[80 + i * 16 + 5];
t1[3] += (FIXED_A) t2[i * 2 + 0] * consts[80 + i * 16 + 6];
t1[3] += (FIXED_A) t2[i * 2 + 1] * consts[80 + i * 16 + 7];
t1[4] += (FIXED_A) t2[i * 2 + 0] * consts[80 + i * 16 + 8];
t1[4] += (FIXED_A) t2[i * 2 + 1] * consts[80 + i * 16 + 9];
t1[5] += (FIXED_A) t2[i * 2 + 0] * consts[80 + i * 16 + 10];
t1[5] += (FIXED_A) t2[i * 2 + 1] * consts[80 + i * 16 + 11];
t1[6] += (FIXED_A) t2[i * 2 + 0] * consts[80 + i * 16 + 12];
t1[6] += (FIXED_A) t2[i * 2 + 1] * consts[80 + i * 16 + 13];
t1[7] += (FIXED_A) t2[i * 2 + 0] * consts[80 + i * 16 + 14];
t1[7] += (FIXED_A) t2[i * 2 + 1] * consts[80 + i * 16 + 15];
}
for (i = 0; i < 8; i++)
out[i] = t1[i] >>
(SBC_COS_TABLE_FIXED8_SCALE - SCALE_OUT_BITS);
}
static inline void sbc_analyze_4b_4s_simd(int16_t *pcm, int16_t *x,
int32_t *out, int out_stride)
{
/* Fetch audio samples and do input data reordering for SIMD */
x[64] = x[0] = pcm[8 + 7];
x[65] = x[1] = pcm[8 + 3];
x[66] = x[2] = pcm[8 + 6];
x[67] = x[3] = pcm[8 + 4];
x[68] = x[4] = pcm[8 + 0];
x[69] = x[5] = pcm[8 + 2];
x[70] = x[6] = pcm[8 + 1];
x[71] = x[7] = pcm[8 + 5];
x[72] = x[8] = pcm[0 + 7];
x[73] = x[9] = pcm[0 + 3];
x[74] = x[10] = pcm[0 + 6];
x[75] = x[11] = pcm[0 + 4];
x[76] = x[12] = pcm[0 + 0];
x[77] = x[13] = pcm[0 + 2];
x[78] = x[14] = pcm[0 + 1];
x[79] = x[15] = pcm[0 + 5];
/* Analyze blocks */
sbc_analyze_four_simd(x + 12, out, analysis_consts_fixed4_simd_odd);
out += out_stride;
sbc_analyze_four_simd(x + 8, out, analysis_consts_fixed4_simd_even);
out += out_stride;
sbc_analyze_four_simd(x + 4, out, analysis_consts_fixed4_simd_odd);
out += out_stride;
sbc_analyze_four_simd(x + 0, out, analysis_consts_fixed4_simd_even);
}
static inline void sbc_analyze_4b_8s_simd(int16_t *pcm, int16_t *x,
int32_t *out, int out_stride)
{
/* Fetch audio samples and do input data reordering for SIMD */
x[128] = x[0] = pcm[16 + 15];
x[129] = x[1] = pcm[16 + 7];
x[130] = x[2] = pcm[16 + 14];
x[131] = x[3] = pcm[16 + 8];
x[132] = x[4] = pcm[16 + 13];
x[133] = x[5] = pcm[16 + 9];
x[134] = x[6] = pcm[16 + 12];
x[135] = x[7] = pcm[16 + 10];
x[136] = x[8] = pcm[16 + 11];
x[137] = x[9] = pcm[16 + 3];
x[138] = x[10] = pcm[16 + 6];
x[139] = x[11] = pcm[16 + 0];
x[140] = x[12] = pcm[16 + 5];
x[141] = x[13] = pcm[16 + 1];
x[142] = x[14] = pcm[16 + 4];
x[143] = x[15] = pcm[16 + 2];
x[144] = x[16] = pcm[0 + 15];
x[145] = x[17] = pcm[0 + 7];
x[146] = x[18] = pcm[0 + 14];
x[147] = x[19] = pcm[0 + 8];
x[148] = x[20] = pcm[0 + 13];
x[149] = x[21] = pcm[0 + 9];
x[150] = x[22] = pcm[0 + 12];
x[151] = x[23] = pcm[0 + 10];
x[152] = x[24] = pcm[0 + 11];
x[153] = x[25] = pcm[0 + 3];
x[154] = x[26] = pcm[0 + 6];
x[155] = x[27] = pcm[0 + 0];
x[156] = x[28] = pcm[0 + 5];
x[157] = x[29] = pcm[0 + 1];
x[158] = x[30] = pcm[0 + 4];
x[159] = x[31] = pcm[0 + 2];
/* Analyze blocks */
sbc_analyze_eight_simd(x + 24, out, analysis_consts_fixed8_simd_odd);
out += out_stride;
sbc_analyze_eight_simd(x + 16, out, analysis_consts_fixed8_simd_even);
out += out_stride;
sbc_analyze_eight_simd(x + 8, out, analysis_consts_fixed8_simd_odd);
out += out_stride;
sbc_analyze_eight_simd(x + 0, out, analysis_consts_fixed8_simd_even);
}
/*
* Detect CPU features and setup function pointers
*/
void sbc_init_primitives(struct sbc_encoder_state *state)
{
/* Default implementation for analyze functions */
state->sbc_analyze_4b_4s = sbc_analyze_4b_4s_simd;
state->sbc_analyze_4b_8s = sbc_analyze_4b_8s_simd;
/* X86/AMD64 optimizations */
#ifdef SBC_BUILD_WITH_MMX_SUPPORT
sbc_init_primitives_mmx(state);
#endif
/* ARM optimizations */
#ifdef SBC_BUILD_WITH_NEON_SUPPORT
sbc_init_primitives_neon(state);
#endif
}
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