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
35 #include "libavutil/mem_internal.h"
38 #include "sbcdsp_data.h"
40 #define SCALE_OUT_BITS 15
41 #define SBC_X_BUFFER_SIZE 328
43 typedef struct sbc_dsp_context SBCDSPContext;
45 struct sbc_dsp_context {
47 /* Number of consecutive blocks handled by the encoder */
49 DECLARE_ALIGNED(SBC_ALIGN, int16_t, X)[2][SBC_X_BUFFER_SIZE];
50 void (*sbc_analyze_4)(const int16_t *in, int32_t *out, const int16_t *consts);
51 void (*sbc_analyze_8)(const int16_t *in, int32_t *out, const int16_t *consts);
52 /* Polyphase analysis filter for 4 subbands configuration,
53 * it handles "increment" blocks at once */
54 void (*sbc_analyze_4s)(SBCDSPContext *s,
55 int16_t *x, int32_t *out, int out_stride);
56 /* Polyphase analysis filter for 8 subbands configuration,
57 * it handles "increment" blocks at once */
58 void (*sbc_analyze_8s)(SBCDSPContext *s,
59 int16_t *x, int32_t *out, int out_stride);
60 /* Process input data (deinterleave, endian conversion, reordering),
61 * depending on the number of subbands and input data byte order */
62 int (*sbc_enc_process_input_4s)(int position, const uint8_t *pcm,
63 int16_t X[2][SBC_X_BUFFER_SIZE],
64 int nsamples, int nchannels);
65 int (*sbc_enc_process_input_8s)(int position, const uint8_t *pcm,
66 int16_t X[2][SBC_X_BUFFER_SIZE],
67 int nsamples, int nchannels);
68 /* Scale factors calculation */
69 void (*sbc_calc_scalefactors)(int32_t sb_sample_f[16][2][8],
70 uint32_t scale_factor[2][8],
71 int blocks, int channels, int subbands);
72 /* Scale factors calculation with joint stereo support */
73 int (*sbc_calc_scalefactors_j)(int32_t sb_sample_f[16][2][8],
74 uint32_t scale_factor[2][8],
75 int blocks, int subbands);
79 * Initialize pointers to the functions which are the basic "building bricks"
80 * of SBC codec. Best implementation is selected based on target CPU
83 void ff_sbcdsp_init(SBCDSPContext *s);
85 void ff_sbcdsp_init_arm(SBCDSPContext *s);
86 void ff_sbcdsp_init_x86(SBCDSPContext *s);
88 #endif /* AVCODEC_SBCDSP_H */