FFmpeg: libavcodec/sbcdsp.h Source File

FFmpeg
sbcdsp.h
Go to the documentation of this file.
1 /*
2  * Bluetooth low-complexity, subband codec (SBC)
3  *
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>
9  *
10  * This file is part of FFmpeg.
11  *
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.
16  *
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.
21  *
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
25  */
26 
27 /**
28  * @file
29  * SBC basic "building bricks"
30  */
31 
32 #ifndef AVCODEC_SBCDSP_H
33 #define AVCODEC_SBCDSP_H
34 
35 #include "libavutil/mem_internal.h"
36 
37 #include "sbc.h"
38 #include "sbcdsp_data.h"
39 
40  #define SCALE_OUT_BITS 15
41  #define SBC_X_BUFFER_SIZE 328
42 
43 typedef struct sbc_dsp_context SBCDSPContext;
44 
45  struct sbc_dsp_context {
46   int position;
47  /* Number of consecutive blocks handled by the encoder */
48   uint8_t increment;
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);
76 };
77 
78 /*
79  * Initialize pointers to the functions which are the basic "building bricks"
80  * of SBC codec. Best implementation is selected based on target CPU
81  * capabilities.
82  */
83 void ff_sbcdsp_init(SBCDSPContext *s);
84 
85 void ff_sbcdsp_init_arm(SBCDSPContext *s);
86 void ff_sbcdsp_init_x86(SBCDSPContext *s);
87 
88 #endif /* AVCODEC_SBCDSP_H */
sbc_dsp_context
Definition: sbcdsp.h:45
mem_internal.h
out
FILE * out
Definition: movenc.c:55
subbands
subbands
Definition: aptx.h:37
ff_sbcdsp_init
void ff_sbcdsp_init(SBCDSPContext *s)
Definition: sbcdsp.c:364
ff_sbcdsp_init_x86
void ff_sbcdsp_init_x86(SBCDSPContext *s)
Definition: sbcdsp_init.c:43
sbc_dsp_context::sbc_analyze_4
void(* sbc_analyze_4)(const int16_t *in, int32_t *out, const int16_t *consts)
Definition: sbcdsp.h:50
s
#define s(width, name)
Definition: cbs_vp9.c:198
channels
channels
Definition: aptx.h:31
sbcdsp_data.h
SBC_ALIGN
#define SBC_ALIGN
Definition: sbc.h:80
sbc_dsp_context::X
int16_t X[2][SBC_X_BUFFER_SIZE]
Definition: sbcdsp.h:49
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem_internal.h:109
sbc_dsp_context::increment
uint8_t increment
Definition: sbcdsp.h:48
sbc.h
sbc_dsp_context::sbc_analyze_4s
void(* sbc_analyze_4s)(SBCDSPContext *s, int16_t *x, int32_t *out, int out_stride)
Definition: sbcdsp.h:54
SBC_X_BUFFER_SIZE
#define SBC_X_BUFFER_SIZE
Definition: sbcdsp.h:41
sbc_dsp_context::sbc_analyze_8
void(* sbc_analyze_8)(const int16_t *in, int32_t *out, const int16_t *consts)
Definition: sbcdsp.h:51
sbc_dsp_context::sbc_calc_scalefactors
void(* sbc_calc_scalefactors)(int32_t sb_sample_f[16][2][8], uint32_t scale_factor[2][8], int blocks, int channels, int subbands)
Definition: sbcdsp.h:69
sbc_dsp_context::sbc_enc_process_input_4s
int(* sbc_enc_process_input_4s)(int position, const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE], int nsamples, int nchannels)
Definition: sbcdsp.h:62
sbc_dsp_context::sbc_enc_process_input_8s
int(* sbc_enc_process_input_8s)(int position, const uint8_t *pcm, int16_t X[2][SBC_X_BUFFER_SIZE], int nsamples, int nchannels)
Definition: sbcdsp.h:65
sbc_dsp_context::sbc_calc_scalefactors_j
int(* sbc_calc_scalefactors_j)(int32_t sb_sample_f[16][2][8], uint32_t scale_factor[2][8], int blocks, int subbands)
Definition: sbcdsp.h:73
int32_t
int32_t
Definition: audioconvert.c:56
sbc_dsp_context::sbc_analyze_8s
void(* sbc_analyze_8s)(SBCDSPContext *s, int16_t *x, int32_t *out, int out_stride)
Definition: sbcdsp.h:58
ff_sbcdsp_init_arm
void ff_sbcdsp_init_arm(SBCDSPContext *s)
Definition: sbcdsp_init_arm.c:88
sbc_dsp_context::position
int position
Definition: sbcdsp.h:46
Generated on Fri Aug 22 2025 13:58:50 for FFmpeg by   doxygen 1.8.17

AltStyle によって変換されたページ (->オリジナル) /