From 9e31e7dde636ca28ee551e8bcf8e4f4ca0ef553d Mon Sep 17 00:00:00 2001 From: Siarhei Siamashka Date: Thu, 15 Jan 2009 19:11:23 +0200 Subject: SIMD-friendly variant of SBC encoder analysis filter Added SIMD-friendly C implementation of SBC analysis filter (the structure of code had to be changed a bit and constants in the tables reordered). This code can be used as a reference for developing platform specific SIMD optimizations. These functions are put into a new file 'sbc_primitives.c', which is going to contain all the basic stuff for SBC codec. --- sbc/sbc_primitives.h | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 sbc/sbc_primitives.h (limited to 'sbc/sbc_primitives.h') diff --git a/sbc/sbc_primitives.h b/sbc/sbc_primitives.h new file mode 100644 index 00000000..ca1ec277 --- /dev/null +++ b/sbc/sbc_primitives.h @@ -0,0 +1,52 @@ +/* + * + * Bluetooth low-complexity, subband codec (SBC) library + * + * Copyright (C) 2004-2009 Marcel Holtmann + * Copyright (C) 2004-2005 Henryk Ploetz + * Copyright (C) 2005-2006 Brad Midgley + * + * + * 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 + * + */ + +#ifndef __SBC_PRIMITIVES_H +#define __SBC_PRIMITIVES_H + +#define SCALE_OUT_BITS 15 + +struct sbc_encoder_state { + int subbands; + int position[2]; + int16_t X[2][256]; + /* Polyphase analysis filter for 4 subbands configuration, + it handles 4 blocks at once */ + void (*sbc_analyze_4b_4s)(int16_t *pcm, int16_t *x, + int32_t *out, int out_stride); + /* Polyphase analysis filter for 8 subbands configuration, + it handles 4 blocks at once */ + void (*sbc_analyze_4b_8s)(int16_t *pcm, int16_t *x, + int32_t *out, int out_stride); +}; + +/* + * Initialize pointers to the functions which are the basic "building bricks" + * of SBC codec. Best implementation is selected based on target CPU + * capabilities. + */ +void sbc_init_primitives(struct sbc_encoder_state *encoder_state); + +#endif -- cgit