2 * Bluetooth low-complexity, subband codec (SBC)
4 * Copyright (C) 2017 Aurelien Jacobs <aurel@gnuage.org>
5 * Copyright (C) 2008-2010 Nokia Corporation
6 * Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org>
7 * Copyright (C) 2004-2005 Henryk Ploetz <henryk@ploetzli.ch>
8 * Copyright (C) 2005-2006 Brad Midgley <bmidgley@xmission.com>
10 * This file is part of FFmpeg.
12 * FFmpeg is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU Lesser General Public
14 * License as published by the Free Software Foundation; either
15 * version 2.1 of the License, or (at your option) any later version.
17 * FFmpeg is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * Lesser General Public License for more details.
22 * You should have received a copy of the GNU Lesser General Public
23 * License along with FFmpeg; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
29 * SBC basic "building bricks"
32 #ifndef AVCODEC_SBCDSP_H
33 #define AVCODEC_SBCDSP_H
36 #include "sbcdsp_data.h"
38 #define SCALE_OUT_BITS 15
39 #define SBC_X_BUFFER_SIZE 328
41 typedef struct sbc_dsp_context SBCDSPContext;
43 struct sbc_dsp_context {
45 /* Number of consecutive blocks handled by the encoder */
47 DECLARE_ALIGNED(SBC_ALIGN, int16_t, X)[2][SBC_X_BUFFER_SIZE];
48 void (*sbc_analyze_4)(const int16_t *in, int32_t *out, const int16_t *consts);
49 void (*sbc_analyze_8)(const int16_t *in, int32_t *out, const int16_t *consts);
50 /* Polyphase analysis filter for 4 subbands configuration,
51 * it handles "increment" blocks at once */
52 void (*sbc_analyze_4s)(SBCDSPContext *s,
53 int16_t *x, int32_t *out, int out_stride);
54 /* Polyphase analysis filter for 8 subbands configuration,
55 * it handles "increment" blocks at once */
56 void (*sbc_analyze_8s)(SBCDSPContext *s,
57 int16_t *x, int32_t *out, int out_stride);
58 /* Process input data (deinterleave, endian conversion, reordering),
59 * depending on the number of subbands and input data byte order */
60 int (*sbc_enc_process_input_4s)(int position, const uint8_t *pcm,
61 int16_t X[2][SBC_X_BUFFER_SIZE],
62 int nsamples, int nchannels);
63 int (*sbc_enc_process_input_8s)(int position, const uint8_t *pcm,
64 int16_t X[2][SBC_X_BUFFER_SIZE],
65 int nsamples, int nchannels);
66 /* Scale factors calculation */
67 void (*sbc_calc_scalefactors)(int32_t sb_sample_f[16][2][8],
68 uint32_t scale_factor[2][8],
69 int blocks, int channels, int subbands);
70 /* Scale factors calculation with joint stereo support */
71 int (*sbc_calc_scalefactors_j)(int32_t sb_sample_f[16][2][8],
72 uint32_t scale_factor[2][8],
73 int blocks, int subbands);
77 * Initialize pointers to the functions which are the basic "building bricks"
78 * of SBC codec. Best implementation is selected based on target CPU
81 void ff_sbcdsp_init(SBCDSPContext *s);
83 void ff_sbcdsp_init_arm(SBCDSPContext *s);
84 void ff_sbcdsp_init_x86(SBCDSPContext *s);
86 #endif /* AVCODEC_SBCDSP_H */