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sbc: implement SBC encoder (low-complexity subband codec) 

This was originally based on libsbc, and was fully integrated into ffmpeg.
This commit is contained in:
Aurelien Jacobs 2017-12-17 19:59:30 +01:00
parent 2e08de0815
commit ff4600d954
12 changed files with 1222 additions and 1 deletions
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2
doc/general.texi
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@ -1142,7 +1142,7 @@ following image formats are supported:
@tab Real low bitrate AC-3 codec
@item RealAudio Lossless @tab @tab X
@item RealAudio SIPR / ACELP.NET @tab @tab X
@item SBC (low-complexity subband codec) @tab @tab X
@item SBC (low-complexity subband codec) @tab X @tab X
@tab Used in Bluetooth A2DP
@item Shorten @tab @tab X
@item Sierra VMD audio @tab @tab X

1
libavcodec/Makefile
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@ -588,6 +588,7 @@ OBJS-$(CONFIG_SUNRAST_DECODER) += sunrast.o
OBJS-$(CONFIG_SUNRAST_ENCODER) += sunrastenc.o
OBJS-$(CONFIG_LIBRSVG_DECODER) += librsvgdec.o
OBJS-$(CONFIG_SBC_DECODER) += sbcdec.o sbcdec_data.o sbc.o
OBJS-$(CONFIG_SBC_ENCODER) += sbcenc.o sbc.o sbcdsp.o sbcdsp_data.o
OBJS-$(CONFIG_SVQ1_DECODER) += svq1dec.o svq1.o svq13.o h263data.o
OBJS-$(CONFIG_SVQ1_ENCODER) += svq1enc.o svq1.o h263data.o \
h263.o ituh263enc.o

1
libavcodec/allcodecs.c
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@ -453,6 +453,7 @@ extern AVCodec ff_ra_144_encoder;
extern AVCodec ff_ra_144_decoder;
extern AVCodec ff_ra_288_decoder;
extern AVCodec ff_ralf_decoder;
extern AVCodec ff_sbc_encoder;
extern AVCodec ff_sbc_decoder;
extern AVCodec ff_shorten_decoder;
extern AVCodec ff_sipr_decoder;

2
libavcodec/avcodec.h
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@ -2926,6 +2926,8 @@ typedef struct AVCodecContext {
#define FF_PROFILE_MJPEG_HUFFMAN_LOSSLESS 0xc3
#define FF_PROFILE_MJPEG_JPEG_LS 0xf7
#define FF_PROFILE_SBC_MSBC 1
/**
* level
* - encoding: Set by user.

1
libavcodec/options_table.h
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@ -300,6 +300,7 @@ static const AVOption avcodec_options[] = {
{"mpeg4_main", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_PROFILE_MPEG4_MAIN }, INT_MIN, INT_MAX, V|E, "profile"},
{"mpeg4_asp", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_PROFILE_MPEG4_ADVANCED_SIMPLE }, INT_MIN, INT_MAX, V|E, "profile"},
{"main10", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_PROFILE_HEVC_MAIN_10 }, INT_MIN, INT_MAX, V|E, "profile"},
{"msbc", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_PROFILE_SBC_MSBC }, INT_MIN, INT_MAX, A|E, "profile"},
{"level", NULL, OFFSET(level), AV_OPT_TYPE_INT, {.i64 = FF_LEVEL_UNKNOWN }, INT_MIN, INT_MAX, V|A|E, "level"},
{"unknown", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = FF_LEVEL_UNKNOWN }, INT_MIN, INT_MAX, V|A|E, "level"},
{"lowres", "decode at 1= 1/2, 2=1/4, 3=1/8 resolutions", OFFSET(lowres), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, V|A|D},

5
libavcodec/profiles.c
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@ -140,4 +140,9 @@ const AVProfile ff_vp9_profiles[] = {
{ FF_PROFILE_UNKNOWN },
};
const AVProfile ff_sbc_profiles[] = {
{ FF_PROFILE_SBC_MSBC, "mSBC" },
{ FF_PROFILE_UNKNOWN },
};
#endif /* !CONFIG_SMALL */

1
libavcodec/profiles.h
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@ -31,5 +31,6 @@ extern const AVProfile ff_mpeg2_video_profiles[];
extern const AVProfile ff_mpeg4_video_profiles[];
extern const AVProfile ff_vc1_profiles[];
extern const AVProfile ff_vp9_profiles[];
extern const AVProfile ff_sbc_profiles[];
#endif /* AVCODEC_PROFILES_H */

382
libavcodec/sbcdsp.c Normal file
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@ -0,0 +1,382 @@
/*
* Bluetooth low-complexity, subband codec (SBC)
*
* Copyright (C) 2017 Aurelien Jacobs <aurel@gnuage.org>
* Copyright (C) 2012-2013 Intel Corporation
* Copyright (C) 2008-2010 Nokia Corporation
* Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org>
* Copyright (C) 2004-2005 Henryk Ploetz <henryk@ploetzli.ch>
* Copyright (C) 2005-2006 Brad Midgley <bmidgley@xmission.com>
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* SBC basic "building bricks"
*/
#include <stdint.h>
#include <limits.h>
#include <string.h>
#include "libavutil/common.h"
#include "libavutil/intmath.h"
#include "libavutil/intreadwrite.h"
#include "sbc.h"
#include "sbcdsp.h"
#include "sbcdsp_data.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 av_always_inline void sbc_analyze_simd(const int16_t *in, int32_t *out,
const int16_t *consts,
unsigned subbands)
{
int32_t t1[8];
int16_t t2[8];
int i, j, hop = 0;
/* rounding coefficient */
for (i = 0; i < subbands; i++)
t1[i] = 1 << (SBC_PROTO_FIXED_SCALE - 1);
/* low pass polyphase filter */
for (hop = 0; hop < 10*subbands; hop += 2*subbands)
for (i = 0; i < 2*subbands; i++)
t1[i >> 1] += in[hop + i] * consts[hop + i];
/* scaling */
for (i = 0; i < subbands; i++)
t2[i] = t1[i] >> SBC_PROTO_FIXED_SCALE;
memset(t1, 0, sizeof(t1));
/* do the cos transform */
for (i = 0; i < subbands/2; i++)
for (j = 0; j < 2*subbands; j++)
t1[j>>1] += t2[i * 2 + (j&1)] * consts[10*subbands + i*2*subbands + j];
for (i = 0; i < subbands; i++)
out[i] = t1[i] >> (SBC_COS_TABLE_FIXED_SCALE - SCALE_OUT_BITS);
}
static void sbc_analyze_4_simd(const int16_t *in, int32_t *out,
const int16_t *consts)
{
sbc_analyze_simd(in, out, consts, 4);
}
static void sbc_analyze_8_simd(const int16_t *in, int32_t *out,
const int16_t *consts)
{
sbc_analyze_simd(in, out, consts, 8);
}
static inline void sbc_analyze_4b_4s_simd(SBCDSPContext *s,
int16_t *x, int32_t *out, int out_stride)
{
/* Analyze blocks */
s->sbc_analyze_4(x + 12, out, ff_sbcdsp_analysis_consts_fixed4_simd_odd);
out += out_stride;
s->sbc_analyze_4(x + 8, out, ff_sbcdsp_analysis_consts_fixed4_simd_even);
out += out_stride;
s->sbc_analyze_4(x + 4, out, ff_sbcdsp_analysis_consts_fixed4_simd_odd);
out += out_stride;
s->sbc_analyze_4(x + 0, out, ff_sbcdsp_analysis_consts_fixed4_simd_even);
}
static inline void sbc_analyze_4b_8s_simd(SBCDSPContext *s,
int16_t *x, int32_t *out, int out_stride)
{
/* Analyze blocks */
s->sbc_analyze_8(x + 24, out, ff_sbcdsp_analysis_consts_fixed8_simd_odd);
out += out_stride;
s->sbc_analyze_8(x + 16, out, ff_sbcdsp_analysis_consts_fixed8_simd_even);
out += out_stride;
s->sbc_analyze_8(x + 8, out, ff_sbcdsp_analysis_consts_fixed8_simd_odd);
out += out_stride;
s->sbc_analyze_8(x + 0, out, ff_sbcdsp_analysis_consts_fixed8_simd_even);
}
static inline void sbc_analyze_1b_8s_simd_even(SBCDSPContext *s,
int16_t *x, int32_t *out,
int out_stride);
static inline void sbc_analyze_1b_8s_simd_odd(SBCDSPContext *s,
int16_t *x, int32_t *out,
int out_stride)
{
s->sbc_analyze_8(x, out, ff_sbcdsp_analysis_consts_fixed8_simd_odd);
s->sbc_analyze_8s = sbc_analyze_1b_8s_simd_even;
}
static inline void sbc_analyze_1b_8s_simd_even(SBCDSPContext *s,
int16_t *x, int32_t *out,
int out_stride)
{
s->sbc_analyze_8(x, out, ff_sbcdsp_analysis_consts_fixed8_simd_even);
s->sbc_analyze_8s = sbc_analyze_1b_8s_simd_odd;
}
/*
* Input data processing functions. The data is endian converted if needed,
* channels are deintrleaved and audio samples are reordered for use in
* SIMD-friendly analysis filter function. The results are put into "X"
* array, getting appended to the previous data (or it is better to say
* prepended, as the buffer is filled from top to bottom). Old data is
* discarded when neededed, but availability of (10 * nrof_subbands)
* contiguous samples is always guaranteed for the input to the analysis
* filter. This is achieved by copying a sufficient part of old data
* to the top of the buffer on buffer wraparound.
*/
static int sbc_enc_process_input_4s(int position, const uint8_t *pcm,
int16_t X[2][SBC_X_BUFFER_SIZE],
int nsamples, int nchannels)
{
int c;
/* handle X buffer wraparound */
if (position < nsamples) {
for (c = 0; c < nchannels; c++)
memcpy(&X[c][SBC_X_BUFFER_SIZE - 40], &X[c][position],
36 * sizeof(int16_t));
position = SBC_X_BUFFER_SIZE - 40;
}
/* copy/permutate audio samples */
for (; nsamples >= 8; nsamples -= 8, pcm += 16 * nchannels) {
position -= 8;
for (c = 0; c < nchannels; c++) {
int16_t *x = &X[c][position];
x[0] = AV_RN16(pcm + 14*nchannels + 2*c);
x[1] = AV_RN16(pcm + 6*nchannels + 2*c);
x[2] = AV_RN16(pcm + 12*nchannels + 2*c);
x[3] = AV_RN16(pcm + 8*nchannels + 2*c);
x[4] = AV_RN16(pcm + 0*nchannels + 2*c);
x[5] = AV_RN16(pcm + 4*nchannels + 2*c);
x[6] = AV_RN16(pcm + 2*nchannels + 2*c);
x[7] = AV_RN16(pcm + 10*nchannels + 2*c);
}
}
return position;
}
static int sbc_enc_process_input_8s(int position, const uint8_t *pcm,
int16_t X[2][SBC_X_BUFFER_SIZE],
int nsamples, int nchannels)
{
int c;
/* handle X buffer wraparound */
if (position < nsamples) {
for (c = 0; c < nchannels; c++)
memcpy(&X[c][SBC_X_BUFFER_SIZE - 72], &X[c][position],
72 * sizeof(int16_t));
position = SBC_X_BUFFER_SIZE - 72;
}
if (position % 16 == 8) {
position -= 8;
nsamples -= 8;
for (c = 0; c < nchannels; c++) {
int16_t *x = &X[c][position];
x[0] = AV_RN16(pcm + 14*nchannels + 2*c);
x[2] = AV_RN16(pcm + 12*nchannels + 2*c);
x[3] = AV_RN16(pcm + 0*nchannels + 2*c);
x[4] = AV_RN16(pcm + 10*nchannels + 2*c);
x[5] = AV_RN16(pcm + 2*nchannels + 2*c);
x[6] = AV_RN16(pcm + 8*nchannels + 2*c);
x[7] = AV_RN16(pcm + 4*nchannels + 2*c);
x[8] = AV_RN16(pcm + 6*nchannels + 2*c);
}
pcm += 16 * nchannels;
}
/* copy/permutate audio samples */
for (; nsamples >= 16; nsamples -= 16, pcm += 32 * nchannels) {
position -= 16;
for (c = 0; c < nchannels; c++) {
int16_t *x = &X[c][position];
x[0] = AV_RN16(pcm + 30*nchannels + 2*c);
x[1] = AV_RN16(pcm + 14*nchannels + 2*c);
x[2] = AV_RN16(pcm + 28*nchannels + 2*c);
x[3] = AV_RN16(pcm + 16*nchannels + 2*c);
x[4] = AV_RN16(pcm + 26*nchannels + 2*c);
x[5] = AV_RN16(pcm + 18*nchannels + 2*c);
x[6] = AV_RN16(pcm + 24*nchannels + 2*c);
x[7] = AV_RN16(pcm + 20*nchannels + 2*c);
x[8] = AV_RN16(pcm + 22*nchannels + 2*c);
x[9] = AV_RN16(pcm + 6*nchannels + 2*c);
x[10] = AV_RN16(pcm + 12*nchannels + 2*c);
x[11] = AV_RN16(pcm + 0*nchannels + 2*c);
x[12] = AV_RN16(pcm + 10*nchannels + 2*c);
x[13] = AV_RN16(pcm + 2*nchannels + 2*c);
x[14] = AV_RN16(pcm + 8*nchannels + 2*c);
x[15] = AV_RN16(pcm + 4*nchannels + 2*c);
}
}
if (nsamples == 8) {
position -= 8;
for (c = 0; c < nchannels; c++) {
int16_t *x = &X[c][position];
x[-7] = AV_RN16(pcm + 14*nchannels + 2*c);
x[1] = AV_RN16(pcm + 6*nchannels + 2*c);
x[2] = AV_RN16(pcm + 12*nchannels + 2*c);
x[3] = AV_RN16(pcm + 0*nchannels + 2*c);
x[4] = AV_RN16(pcm + 10*nchannels + 2*c);
x[5] = AV_RN16(pcm + 2*nchannels + 2*c);
x[6] = AV_RN16(pcm + 8*nchannels + 2*c);
x[7] = AV_RN16(pcm + 4*nchannels + 2*c);
}
}
return position;
}
static void sbc_calc_scalefactors(int32_t sb_sample_f[16][2][8],
uint32_t scale_factor[2][8],
int blocks, int channels, int subbands)
{
int ch, sb, blk;
for (ch = 0; ch < channels; ch++) {
for (sb = 0; sb < subbands; sb++) {
uint32_t x = 1 << SCALE_OUT_BITS;
for (blk = 0; blk < blocks; blk++) {
int32_t tmp = FFABS(sb_sample_f[blk][ch][sb]);
if (tmp != 0)
x |= tmp - 1;
}
scale_factor[ch][sb] = (31 - SCALE_OUT_BITS) - ff_clz(x);
}
}
}
static int sbc_calc_scalefactors_j(int32_t sb_sample_f[16][2][8],
uint32_t scale_factor[2][8],
int blocks, int subbands)
{
int blk, joint = 0;
int32_t tmp0, tmp1;
uint32_t x, y;
/* last subband does not use joint stereo */
int sb = subbands - 1;
x = 1 << SCALE_OUT_BITS;
y = 1 << SCALE_OUT_BITS;
for (blk = 0; blk < blocks; blk++) {
tmp0 = FFABS(sb_sample_f[blk][0][sb]);
tmp1 = FFABS(sb_sample_f[blk][1][sb]);
if (tmp0 != 0)
x |= tmp0 - 1;
if (tmp1 != 0)
y |= tmp1 - 1;
}
scale_factor[0][sb] = (31 - SCALE_OUT_BITS) - ff_clz(x);
scale_factor[1][sb] = (31 - SCALE_OUT_BITS) - ff_clz(y);
/* the rest of subbands can use joint stereo */
while (--sb >= 0) {
int32_t sb_sample_j[16][2];
x = 1 << SCALE_OUT_BITS;
y = 1 << SCALE_OUT_BITS;
for (blk = 0; blk < blocks; blk++) {
tmp0 = sb_sample_f[blk][0][sb];
tmp1 = sb_sample_f[blk][1][sb];
sb_sample_j[blk][0] = (tmp0 >> 1) + (tmp1 >> 1);
sb_sample_j[blk][1] = (tmp0 >> 1) - (tmp1 >> 1);
tmp0 = FFABS(tmp0);
tmp1 = FFABS(tmp1);
if (tmp0 != 0)
x |= tmp0 - 1;
if (tmp1 != 0)
y |= tmp1 - 1;
}
scale_factor[0][sb] = (31 - SCALE_OUT_BITS) -
ff_clz(x);
scale_factor[1][sb] = (31 - SCALE_OUT_BITS) -
ff_clz(y);
x = 1 << SCALE_OUT_BITS;
y = 1 << SCALE_OUT_BITS;
for (blk = 0; blk < blocks; blk++) {
tmp0 = FFABS(sb_sample_j[blk][0]);
tmp1 = FFABS(sb_sample_j[blk][1]);
if (tmp0 != 0)
x |= tmp0 - 1;
if (tmp1 != 0)
y |= tmp1 - 1;
}
x = (31 - SCALE_OUT_BITS) - ff_clz(x);
y = (31 - SCALE_OUT_BITS) - ff_clz(y);
/* decide whether to use joint stereo for this subband */
if ((scale_factor[0][sb] + scale_factor[1][sb]) > x + y) {
joint |= 1 << (subbands - 1 - sb);
scale_factor[0][sb] = x;
scale_factor[1][sb] = y;
for (blk = 0; blk < blocks; blk++) {
sb_sample_f[blk][0][sb] = sb_sample_j[blk][0];
sb_sample_f[blk][1][sb] = sb_sample_j[blk][1];
}
}
}
/* bitmask with the information about subbands using joint stereo */
return joint;
}
/*
* Detect CPU features and setup function pointers
*/
av_cold void ff_sbcdsp_init(SBCDSPContext *s)
{
/* Default implementation for analyze functions */
s->sbc_analyze_4 = sbc_analyze_4_simd;
s->sbc_analyze_8 = sbc_analyze_8_simd;
s->sbc_analyze_4s = sbc_analyze_4b_4s_simd;
if (s->increment == 1)
s->sbc_analyze_8s = sbc_analyze_1b_8s_simd_odd;
else
s->sbc_analyze_8s = sbc_analyze_4b_8s_simd;
/* Default implementation for input reordering / deinterleaving */
s->sbc_enc_process_input_4s = sbc_enc_process_input_4s;
s->sbc_enc_process_input_8s = sbc_enc_process_input_8s;
/* Default implementation for scale factors calculation */
s->sbc_calc_scalefactors = sbc_calc_scalefactors;
s->sbc_calc_scalefactors_j = sbc_calc_scalefactors_j;
}

83
libavcodec/sbcdsp.h Normal file
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@ -0,0 +1,83 @@
/*
* Bluetooth low-complexity, subband codec (SBC)
*
* Copyright (C) 2017 Aurelien Jacobs <aurel@gnuage.org>
* Copyright (C) 2008-2010 Nokia Corporation
* Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org>
* Copyright (C) 2004-2005 Henryk Ploetz <henryk@ploetzli.ch>
* Copyright (C) 2005-2006 Brad Midgley <bmidgley@xmission.com>
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* SBC basic "building bricks"
*/
#ifndef AVCODEC_SBCDSP_H
#define AVCODEC_SBCDSP_H
#include "sbc.h"
#include "sbcdsp_data.h"
#define SCALE_OUT_BITS 15
#define SBC_X_BUFFER_SIZE 328
typedef struct sbc_dsp_context SBCDSPContext;
struct sbc_dsp_context {
int position;
/* Number of consecutive blocks handled by the encoder */
uint8_t increment;
DECLARE_ALIGNED(SBC_ALIGN, int16_t, X)[2][SBC_X_BUFFER_SIZE];
void (*sbc_analyze_4)(const int16_t *in, int32_t *out, const int16_t *consts);
void (*sbc_analyze_8)(const int16_t *in, int32_t *out, const int16_t *consts);
/* Polyphase analysis filter for 4 subbands configuration,
* it handles "increment" blocks at once */
void (*sbc_analyze_4s)(SBCDSPContext *s,
int16_t *x, int32_t *out, int out_stride);
/* Polyphase analysis filter for 8 subbands configuration,
* it handles "increment" blocks at once */
void (*sbc_analyze_8s)(SBCDSPContext *s,
int16_t *x, int32_t *out, int out_stride);
/* Process input data (deinterleave, endian conversion, reordering),
* depending on the number of subbands and input data byte order */
int (*sbc_enc_process_input_4s)(int position, const uint8_t *pcm,
int16_t X[2][SBC_X_BUFFER_SIZE],
int nsamples, int nchannels);
int (*sbc_enc_process_input_8s)(int position, const uint8_t *pcm,
int16_t X[2][SBC_X_BUFFER_SIZE],
int nsamples, int nchannels);
/* Scale factors calculation */
void (*sbc_calc_scalefactors)(int32_t sb_sample_f[16][2][8],
uint32_t scale_factor[2][8],
int blocks, int channels, int subbands);
/* Scale factors calculation with joint stereo support */
int (*sbc_calc_scalefactors_j)(int32_t sb_sample_f[16][2][8],
uint32_t scale_factor[2][8],
int blocks, int subbands);
};
/*
* Initialize pointers to the functions which are the basic "building bricks"
* of SBC codec. Best implementation is selected based on target CPU
* capabilities.
*/
void ff_sbcdsp_init(SBCDSPContext *s);
#endif /* AVCODEC_SBCDSP_H */

329
libavcodec/sbcdsp_data.c Normal file
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@ -0,0 +1,329 @@
/*
* Bluetooth low-complexity, subband codec (SBC)
*
* Copyright (C) 2017 Aurelien Jacobs <aurel@gnuage.org>
* Copyright (C) 2008-2010 Nokia Corporation
* Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org>
* Copyright (C) 2004-2005 Henryk Ploetz <henryk@ploetzli.ch>
* Copyright (C) 2005-2006 Brad Midgley <bmidgley@xmission.com>
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* miscellaneous SBC tables
*/
#include "sbcdsp_data.h"
#define F_PROTO(x) ((int32_t) (((x) * 2) * ((int32_t) 1 << 15) + 0.5))
#define F_COS(x) ((int32_t) (((x) ) * ((int32_t) 1 << 15) + 0.5))
/*
* Constant tables for the use in SIMD optimized analysis filters
* Each table consists of two parts:
* 1. reordered "proto" table
* 2. reordered "cos" table
*
* Due to non-symmetrical reordering, separate tables for "even"
* and "odd" cases are needed
*/
DECLARE_ALIGNED(SBC_ALIGN, const int16_t, ff_sbcdsp_analysis_consts_fixed4_simd_even)[40 + 16] = {
#define C0 1.0932568993
#define C1 1.3056875580
#define C2 1.3056875580
#define C3 1.6772280856
#define F(x) F_PROTO(x)
F(0.00000000E+00 * C0), F(3.83720193E-03 * C0),
F(5.36548976E-04 * C1), F(2.73370904E-03 * C1),
F(3.06012286E-03 * C2), F(3.89205149E-03 * C2),
F(0.00000000E+00 * C3), -F(1.49188357E-03 * C3),
F(1.09137620E-02 * C0), F(2.58767811E-02 * C0),
F(2.04385087E-02 * C1), F(3.21939290E-02 * C1),
F(7.76463494E-02 * C2), F(6.13245186E-03 * C2),
F(0.00000000E+00 * C3), -F(2.88757392E-02 * C3),
F(1.35593274E-01 * C0), F(2.94315332E-01 * C0),
F(1.94987841E-01 * C1), F(2.81828203E-01 * C1),
-F(1.94987841E-01 * C2), F(2.81828203E-01 * C2),
F(0.00000000E+00 * C3), -F(2.46636662E-01 * C3),
-F(1.35593274E-01 * C0), F(2.58767811E-02 * C0),
-F(7.76463494E-02 * C1), F(6.13245186E-03 * C1),
-F(2.04385087E-02 * C2), F(3.21939290E-02 * C2),
F(0.00000000E+00 * C3), F(2.88217274E-02 * C3),
-F(1.09137620E-02 * C0), F(3.83720193E-03 * C0),
-F(3.06012286E-03 * C1), F(3.89205149E-03 * C1),
-F(5.36548976E-04 * C2), F(2.73370904E-03 * C2),
F(0.00000000E+00 * C3), -F(1.86581691E-03 * C3),
#undef F
#define F(x) F_COS(x)
F(0.7071067812 / C0), F(0.9238795325 / C1),
-F(0.7071067812 / C0), F(0.3826834324 / C1),
-F(0.7071067812 / C0), -F(0.3826834324 / C1),
F(0.7071067812 / C0), -F(0.9238795325 / C1),
F(0.3826834324 / C2), -F(1.0000000000 / C3),
-F(0.9238795325 / C2), -F(1.0000000000 / C3),
F(0.9238795325 / C2), -F(1.0000000000 / C3),
-F(0.3826834324 / C2), -F(1.0000000000 / C3),
#undef F
#undef C0
#undef C1
#undef C2
#undef C3
};
DECLARE_ALIGNED(SBC_ALIGN, const int16_t, ff_sbcdsp_analysis_consts_fixed4_simd_odd)[40 + 16] = {
#define C0 1.3056875580
#define C1 1.6772280856
#define C2 1.0932568993
#define C3 1.3056875580
#define F(x) F_PROTO(x)
F(2.73370904E-03 * C0), F(5.36548976E-04 * C0),
-F(1.49188357E-03 * C1), F(0.00000000E+00 * C1),
F(3.83720193E-03 * C2), F(1.09137620E-02 * C2),
F(3.89205149E-03 * C3), F(3.06012286E-03 * C3),
F(3.21939290E-02 * C0), F(2.04385087E-02 * C0),
-F(2.88757392E-02 * C1), F(0.00000000E+00 * C1),
F(2.58767811E-02 * C2), F(1.35593274E-01 * C2),
F(6.13245186E-03 * C3), F(7.76463494E-02 * C3),
F(2.81828203E-01 * C0), F(1.94987841E-01 * C0),
-F(2.46636662E-01 * C1), F(0.00000000E+00 * C1),
F(2.94315332E-01 * C2), -F(1.35593274E-01 * C2),
F(2.81828203E-01 * C3), -F(1.94987841E-01 * C3),
F(6.13245186E-03 * C0), -F(7.76463494E-02 * C0),
F(2.88217274E-02 * C1), F(0.00000000E+00 * C1),
F(2.58767811E-02 * C2), -F(1.09137620E-02 * C2),
F(3.21939290E-02 * C3), -F(2.04385087E-02 * C3),
F(3.89205149E-03 * C0), -F(3.06012286E-03 * C0),
-F(1.86581691E-03 * C1), F(0.00000000E+00 * C1),
F(3.83720193E-03 * C2), F(0.00000000E+00 * C2),
F(2.73370904E-03 * C3), -F(5.36548976E-04 * C3),
#undef F
#define F(x) F_COS(x)
F(0.9238795325 / C0), -F(1.0000000000 / C1),
F(0.3826834324 / C0), -F(1.0000000000 / C1),
-F(0.3826834324 / C0), -F(1.0000000000 / C1),
-F(0.9238795325 / C0), -F(1.0000000000 / C1),
F(0.7071067812 / C2), F(0.3826834324 / C3),
-F(0.7071067812 / C2), -F(0.9238795325 / C3),
-F(0.7071067812 / C2), F(0.9238795325 / C3),
F(0.7071067812 / C2), -F(0.3826834324 / C3),
#undef F
#undef C0
#undef C1
#undef C2
#undef C3
};
DECLARE_ALIGNED(SBC_ALIGN, const int16_t, ff_sbcdsp_analysis_consts_fixed8_simd_even)[80 + 64] = {
#define C0 2.7906148894
#define C1 2.4270044280
#define C2 2.8015616024
#define C3 3.1710363741
#define C4 2.5377944043
#define C5 2.4270044280
#define C6 2.8015616024
#define C7 3.1710363741
#define F(x) F_PROTO(x)
F(0.00000000E+00 * C0), F(2.01182542E-03 * C0),
F(1.56575398E-04 * C1), F(1.78371725E-03 * C1),
F(3.43256425E-04 * C2), F(1.47640169E-03 * C2),
F(5.54620202E-04 * C3), F(1.13992507E-03 * C3),
-F(8.23919506E-04 * C4), F(0.00000000E+00 * C4),
F(2.10371989E-03 * C5), F(3.49717454E-03 * C5),
F(1.99454554E-03 * C6), F(1.64973098E-03 * C6),
F(1.61656283E-03 * C7), F(1.78805361E-04 * C7),
F(5.65949473E-03 * C0), F(1.29371806E-02 * C0),
F(8.02941163E-03 * C1), F(1.53184106E-02 * C1),
F(1.04584443E-02 * C2), F(1.62208471E-02 * C2),
F(1.27472335E-02 * C3), F(1.59045603E-02 * C3),
-F(1.46525263E-02 * C4), F(0.00000000E+00 * C4),
F(8.85757540E-03 * C5), F(5.31873032E-02 * C5),
F(2.92408442E-03 * C6), F(3.90751381E-02 * C6),
-F(4.91578024E-03 * C7), F(2.61098752E-02 * C7),
F(6.79989431E-02 * C0), F(1.46955068E-01 * C0),
F(8.29847578E-02 * C1), F(1.45389847E-01 * C1),
F(9.75753918E-02 * C2), F(1.40753505E-01 * C2),
F(1.11196689E-01 * C3), F(1.33264415E-01 * C3),
-F(1.23264548E-01 * C4), F(0.00000000E+00 * C4),
F(1.45389847E-01 * C5), -F(8.29847578E-02 * C5),
F(1.40753505E-01 * C6), -F(9.75753918E-02 * C6),
F(1.33264415E-01 * C7), -F(1.11196689E-01 * C7),
-F(6.79989431E-02 * C0), F(1.29371806E-02 * C0),
-F(5.31873032E-02 * C1), F(8.85757540E-03 * C1),
-F(3.90751381E-02 * C2), F(2.92408442E-03 * C2),
-F(2.61098752E-02 * C3), -F(4.91578024E-03 * C3),
F(1.46404076E-02 * C4), F(0.00000000E+00 * C4),
F(1.53184106E-02 * C5), -F(8.02941163E-03 * C5),
F(1.62208471E-02 * C6), -F(1.04584443E-02 * C6),
F(1.59045603E-02 * C7), -F(1.27472335E-02 * C7),
-F(5.65949473E-03 * C0), F(2.01182542E-03 * C0),
-F(3.49717454E-03 * C1), F(2.10371989E-03 * C1),
-F(1.64973098E-03 * C2), F(1.99454554E-03 * C2),
-F(1.78805361E-04 * C3), F(1.61656283E-03 * C3),
-F(9.02154502E-04 * C4), F(0.00000000E+00 * C4),
F(1.78371725E-03 * C5), -F(1.56575398E-04 * C5),
F(1.47640169E-03 * C6), -F(3.43256425E-04 * C6),
F(1.13992507E-03 * C7), -F(5.54620202E-04 * C7),
#undef F
#define F(x) F_COS(x)
F(0.7071067812 / C0), F(0.8314696123 / C1),
-F(0.7071067812 / C0), -F(0.1950903220 / C1),
-F(0.7071067812 / C0), -F(0.9807852804 / C1),
F(0.7071067812 / C0), -F(0.5555702330 / C1),
F(0.7071067812 / C0), F(0.5555702330 / C1),
-F(0.7071067812 / C0), F(0.9807852804 / C1),
-F(0.7071067812 / C0), F(0.1950903220 / C1),
F(0.7071067812 / C0), -F(0.8314696123 / C1),
F(0.9238795325 / C2), F(0.9807852804 / C3),
F(0.3826834324 / C2), F(0.8314696123 / C3),
-F(0.3826834324 / C2), F(0.5555702330 / C3),
-F(0.9238795325 / C2), F(0.1950903220 / C3),
-F(0.9238795325 / C2), -F(0.1950903220 / C3),
-F(0.3826834324 / C2), -F(0.5555702330 / C3),
F(0.3826834324 / C2), -F(0.8314696123 / C3),
F(0.9238795325 / C2), -F(0.9807852804 / C3),
-F(1.0000000000 / C4), F(0.5555702330 / C5),
-F(1.0000000000 / C4), -F(0.9807852804 / C5),
-F(1.0000000000 / C4), F(0.1950903220 / C5),
-F(1.0000000000 / C4), F(0.8314696123 / C5),
-F(1.0000000000 / C4), -F(0.8314696123 / C5),
-F(1.0000000000 / C4), -F(0.1950903220 / C5),
-F(1.0000000000 / C4), F(0.9807852804 / C5),
-F(1.0000000000 / C4), -F(0.5555702330 / C5),
F(0.3826834324 / C6), F(0.1950903220 / C7),
-F(0.9238795325 / C6), -F(0.5555702330 / C7),
F(0.9238795325 / C6), F(0.8314696123 / C7),
-F(0.3826834324 / C6), -F(0.9807852804 / C7),
-F(0.3826834324 / C6), F(0.9807852804 / C7),
F(0.9238795325 / C6), -F(0.8314696123 / C7),
-F(0.9238795325 / C6), F(0.5555702330 / C7),
F(0.3826834324 / C6), -F(0.1950903220 / C7),
#undef F
#undef C0
#undef C1
#undef C2
#undef C3
#undef C4
#undef C5
#undef C6
#undef C7
};
DECLARE_ALIGNED(SBC_ALIGN, const int16_t, ff_sbcdsp_analysis_consts_fixed8_simd_odd)[80 + 64] = {
#define C0 2.5377944043
#define C1 2.4270044280
#define C2 2.8015616024
#define C3 3.1710363741
#define C4 2.7906148894
#define C5 2.4270044280
#define C6 2.8015616024
#define C7 3.1710363741
#define F(x) F_PROTO(x)
F(0.00000000E+00 * C0), -F(8.23919506E-04 * C0),
F(1.56575398E-04 * C1), F(1.78371725E-03 * C1),
F(3.43256425E-04 * C2), F(1.47640169E-03 * C2),
F(5.54620202E-04 * C3), F(1.13992507E-03 * C3),
F(2.01182542E-03 * C4), F(5.65949473E-03 * C4),
F(2.10371989E-03 * C5), F(3.49717454E-03 * C5),
F(1.99454554E-03 * C6), F(1.64973098E-03 * C6),
F(1.61656283E-03 * C7), F(1.78805361E-04 * C7),
F(0.00000000E+00 * C0), -F(1.46525263E-02 * C0),
F(8.02941163E-03 * C1), F(1.53184106E-02 * C1),
F(1.04584443E-02 * C2), F(1.62208471E-02 * C2),
F(1.27472335E-02 * C3), F(1.59045603E-02 * C3),
F(1.29371806E-02 * C4), F(6.79989431E-02 * C4),
F(8.85757540E-03 * C5), F(5.31873032E-02 * C5),
F(2.92408442E-03 * C6), F(3.90751381E-02 * C6),
-F(4.91578024E-03 * C7), F(2.61098752E-02 * C7),
F(0.00000000E+00 * C0), -F(1.23264548E-01 * C0),
F(8.29847578E-02 * C1), F(1.45389847E-01 * C1),
F(9.75753918E-02 * C2), F(1.40753505E-01 * C2),
F(1.11196689E-01 * C3), F(1.33264415E-01 * C3),
F(1.46955068E-01 * C4), -F(6.79989431E-02 * C4),
F(1.45389847E-01 * C5), -F(8.29847578E-02 * C5),
F(1.40753505E-01 * C6), -F(9.75753918E-02 * C6),
F(1.33264415E-01 * C7), -F(1.11196689E-01 * C7),
F(0.00000000E+00 * C0), F(1.46404076E-02 * C0),
-F(5.31873032E-02 * C1), F(8.85757540E-03 * C1),
-F(3.90751381E-02 * C2), F(2.92408442E-03 * C2),
-F(2.61098752E-02 * C3), -F(4.91578024E-03 * C3),
F(1.29371806E-02 * C4), -F(5.65949473E-03 * C4),
F(1.53184106E-02 * C5), -F(8.02941163E-03 * C5),
F(1.62208471E-02 * C6), -F(1.04584443E-02 * C6),
F(1.59045603E-02 * C7), -F(1.27472335E-02 * C7),
F(0.00000000E+00 * C0), -F(9.02154502E-04 * C0),
-F(3.49717454E-03 * C1), F(2.10371989E-03 * C1),
-F(1.64973098E-03 * C2), F(1.99454554E-03 * C2),
-F(1.78805361E-04 * C3), F(1.61656283E-03 * C3),
F(2.01182542E-03 * C4), F(0.00000000E+00 * C4),
F(1.78371725E-03 * C5), -F(1.56575398E-04 * C5),
F(1.47640169E-03 * C6), -F(3.43256425E-04 * C6),
F(1.13992507E-03 * C7), -F(5.54620202E-04 * C7),
#undef F
#define F(x) F_COS(x)
-F(1.0000000000 / C0), F(0.8314696123 / C1),
-F(1.0000000000 / C0), -F(0.1950903220 / C1),
-F(1.0000000000 / C0), -F(0.9807852804 / C1),
-F(1.0000000000 / C0), -F(0.5555702330 / C1),
-F(1.0000000000 / C0), F(0.5555702330 / C1),
-F(1.0000000000 / C0), F(0.9807852804 / C1),
-F(1.0000000000 / C0), F(0.1950903220 / C1),
-F(1.0000000000 / C0), -F(0.8314696123 / C1),
F(0.9238795325 / C2), F(0.9807852804 / C3),
F(0.3826834324 / C2), F(0.8314696123 / C3),
-F(0.3826834324 / C2), F(0.5555702330 / C3),
-F(0.9238795325 / C2), F(0.1950903220 / C3),
-F(0.9238795325 / C2), -F(0.1950903220 / C3),
-F(0.3826834324 / C2), -F(0.5555702330 / C3),
F(0.3826834324 / C2), -F(0.8314696123 / C3),
F(0.9238795325 / C2), -F(0.9807852804 / C3),
F(0.7071067812 / C4), F(0.5555702330 / C5),
-F(0.7071067812 / C4), -F(0.9807852804 / C5),
-F(0.7071067812 / C4), F(0.1950903220 / C5),
F(0.7071067812 / C4), F(0.8314696123 / C5),
F(0.7071067812 / C4), -F(0.8314696123 / C5),
-F(0.7071067812 / C4), -F(0.1950903220 / C5),
-F(0.7071067812 / C4), F(0.9807852804 / C5),
F(0.7071067812 / C4), -F(0.5555702330 / C5),
F(0.3826834324 / C6), F(0.1950903220 / C7),
-F(0.9238795325 / C6), -F(0.5555702330 / C7),
F(0.9238795325 / C6), F(0.8314696123 / C7),
-F(0.3826834324 / C6), -F(0.9807852804 / C7),
-F(0.3826834324 / C6), F(0.9807852804 / C7),
F(0.9238795325 / C6), -F(0.8314696123 / C7),
-F(0.9238795325 / C6), F(0.5555702330 / C7),
F(0.3826834324 / C6), -F(0.1950903220 / C7),
#undef F
#undef C0
#undef C1
#undef C2
#undef C3
#undef C4
#undef C5
#undef C6
#undef C7
};

55
libavcodec/sbcdsp_data.h Normal file
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/*
* Bluetooth low-complexity, subband codec (SBC)
*
* Copyright (C) 2017 Aurelien Jacobs <aurel@gnuage.org>
* Copyright (C) 2008-2010 Nokia Corporation
* Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org>
* Copyright (C) 2004-2005 Henryk Ploetz <henryk@ploetzli.ch>
* Copyright (C) 2005-2006 Brad Midgley <bmidgley@xmission.com>
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* miscellaneous SBC tables
*/
#ifndef AVCODEC_SBCDSP_DATA_H
#define AVCODEC_SBCDSP_DATA_H
#include "sbc.h"
#define SBC_PROTO_FIXED_SCALE 16
#define SBC_COS_TABLE_FIXED_SCALE 15
/*
* Constant tables for the use in SIMD optimized analysis filters
* Each table consists of two parts:
* 1. reordered "proto" table
* 2. reordered "cos" table
*
* Due to non-symmetrical reordering, separate tables for "even"
* and "odd" cases are needed
*/
extern const int16_t ff_sbcdsp_analysis_consts_fixed4_simd_even[];
extern const int16_t ff_sbcdsp_analysis_consts_fixed4_simd_odd[];
extern const int16_t ff_sbcdsp_analysis_consts_fixed8_simd_even[];
extern const int16_t ff_sbcdsp_analysis_consts_fixed8_simd_odd[];
#endif /* AVCODEC_SBCDSP_DATA_H */

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libavcodec/sbcenc.c Normal file
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/*
* Bluetooth low-complexity, subband codec (SBC)
*
* Copyright (C) 2017 Aurelien Jacobs <aurel@gnuage.org>
* Copyright (C) 2012-2013 Intel Corporation
* Copyright (C) 2008-2010 Nokia Corporation
* Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org>
* Copyright (C) 2004-2005 Henryk Ploetz <henryk@ploetzli.ch>
* Copyright (C) 2005-2008 Brad Midgley <bmidgley@xmission.com>
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* SBC encoder implementation
*/
#include <stdbool.h>
#include "libavutil/opt.h"
#include "avcodec.h"
#include "internal.h"
#include "profiles.h"
#include "put_bits.h"
#include "sbc.h"
#include "sbcdsp.h"
typedef struct SBCEncContext {
AVClass *class;
int64_t max_delay;
int msbc;
DECLARE_ALIGNED(SBC_ALIGN, struct sbc_frame, frame);
DECLARE_ALIGNED(SBC_ALIGN, SBCDSPContext, dsp);
} SBCEncContext;
static int sbc_analyze_audio(SBCDSPContext *s, struct sbc_frame *frame)
{
int ch, blk;
int16_t *x;
switch (frame->subbands) {
case 4:
for (ch = 0; ch < frame->channels; ch++) {
x = &s->X[ch][s->position - 4 *
s->increment + frame->blocks * 4];
for (blk = 0; blk < frame->blocks;
blk += s->increment) {
s->sbc_analyze_4s(
s, x,
frame->sb_sample_f[blk][ch],
frame->sb_sample_f[blk + 1][ch] -
frame->sb_sample_f[blk][ch]);
x -= 4 * s->increment;
}
}
return frame->blocks * 4;
case 8:
for (ch = 0; ch < frame->channels; ch++) {
x = &s->X[ch][s->position - 8 *
s->increment + frame->blocks * 8];
for (blk = 0; blk < frame->blocks;
blk += s->increment) {
s->sbc_analyze_8s(
s, x,
frame->sb_sample_f[blk][ch],
frame->sb_sample_f[blk + 1][ch] -
frame->sb_sample_f[blk][ch]);
x -= 8 * s->increment;
}
}
return frame->blocks * 8;
default:
return AVERROR(EIO);
}
}
/*
* Packs the SBC frame from frame into the memory in avpkt.
* Returns the length of the packed frame.
*/
static size_t sbc_pack_frame(AVPacket *avpkt, struct sbc_frame *frame,
int joint, bool msbc)
{
PutBitContext pb;
/* Will copy the header parts for CRC-8 calculation here */
uint8_t crc_header[11] = { 0 };
int crc_pos;
uint32_t audio_sample;
int ch, sb, blk; /* channel, subband, block and bit counters */
int bits[2][8]; /* bits distribution */
uint32_t levels[2][8]; /* levels are derived from that */
uint32_t sb_sample_delta[2][8];
if (msbc) {
avpkt->data[0] = MSBC_SYNCWORD;
avpkt->data[1] = 0;
avpkt->data[2] = 0;
} else {
avpkt->data[0] = SBC_SYNCWORD;
avpkt->data[1] = (frame->frequency & 0x03) << 6;
avpkt->data[1] |= (((frame->blocks >> 2) - 1) & 0x03) << 4;
avpkt->data[1] |= (frame->mode & 0x03) << 2;
avpkt->data[1] |= (frame->allocation & 0x01) << 1;
avpkt->data[1] |= ((frame->subbands == 8) & 0x01) << 0;
avpkt->data[2] = frame->bitpool;
if (frame->bitpool > frame->subbands << (4 + (frame->mode == STEREO
|| frame->mode == JOINT_STEREO)))
return -5;
}
/* Can't fill in crc yet */
crc_header[0] = avpkt->data[1];
crc_header[1] = avpkt->data[2];
crc_pos = 16;
init_put_bits(&pb, avpkt->data + 4, avpkt->size);
if (frame->mode == JOINT_STEREO) {
put_bits(&pb, frame->subbands, joint);
crc_header[crc_pos >> 3] = joint;
crc_pos += frame->subbands;
}
for (ch = 0; ch < frame->channels; ch++) {
for (sb = 0; sb < frame->subbands; sb++) {
put_bits(&pb, 4, frame->scale_factor[ch][sb] & 0x0F);
crc_header[crc_pos >> 3] <<= 4;
crc_header[crc_pos >> 3] |= frame->scale_factor[ch][sb] & 0x0F;
crc_pos += 4;
}
}
/* align the last crc byte */
if (crc_pos % 8)
crc_header[crc_pos >> 3] <<= 8 - (crc_pos % 8);
avpkt->data[3] = sbc_crc8(frame->crc_ctx, crc_header, crc_pos);
ff_sbc_calculate_bits(frame, bits);
for (ch = 0; ch < frame->channels; ch++) {
for (sb = 0; sb < frame->subbands; sb++) {
levels[ch][sb] = ((1 << bits[ch][sb]) - 1) <<
(32 - (frame->scale_factor[ch][sb] +
SCALE_OUT_BITS + 2));
sb_sample_delta[ch][sb] = (uint32_t) 1 <<
(frame->scale_factor[ch][sb] +
SCALE_OUT_BITS + 1);
}
}
for (blk = 0; blk < frame->blocks; blk++) {
for (ch = 0; ch < frame->channels; ch++) {
for (sb = 0; sb < frame->subbands; sb++) {
if (bits[ch][sb] == 0)
continue;
audio_sample = ((uint64_t) levels[ch][sb] *
(sb_sample_delta[ch][sb] +
frame->sb_sample_f[blk][ch][sb])) >> 32;
put_bits(&pb, bits[ch][sb], audio_sample);
}
}
}
flush_put_bits(&pb);
return (put_bits_count(&pb) + 7) / 8;
}
static int sbc_encode_init(AVCodecContext *avctx)
{
SBCEncContext *sbc = avctx->priv_data;
struct sbc_frame *frame = &sbc->frame;
if (avctx->profile == FF_PROFILE_SBC_MSBC)
sbc->msbc = 1;
if (sbc->msbc) {
if (avctx->channels != 1) {
av_log(avctx, AV_LOG_ERROR, "mSBC require mono channel.\n");
return AVERROR(EINVAL);
}
if (avctx->sample_rate != 16000) {
av_log(avctx, AV_LOG_ERROR, "mSBC require 16 kHz samplerate.\n");
return AVERROR(EINVAL);
}
frame->mode = SBC_MODE_MONO;
frame->subbands = 8;
frame->blocks = MSBC_BLOCKS;
frame->allocation = SBC_AM_LOUDNESS;
frame->bitpool = 26;
avctx->frame_size = 8 * MSBC_BLOCKS;
} else {
int d;
if (avctx->global_quality > 255*FF_QP2LAMBDA) {
av_log(avctx, AV_LOG_ERROR, "bitpool > 255 is not allowed.\n");
return AVERROR(EINVAL);
}
if (avctx->channels == 1) {
frame->mode = SBC_MODE_MONO;
if (sbc->max_delay <= 3000 || avctx->bit_rate > 270000)
frame->subbands = 4;
else
frame->subbands = 8;
} else {
if (avctx->bit_rate < 180000 || avctx->bit_rate > 420000)
frame->mode = SBC_MODE_JOINT_STEREO;
else
frame->mode = SBC_MODE_STEREO;
if (sbc->max_delay <= 4000 || avctx->bit_rate > 420000)
frame->subbands = 4;
else
frame->subbands = 8;
}
/* sbc algorithmic delay is ((blocks + 10) * subbands - 2) / sample_rate */
frame->blocks = av_clip(((sbc->max_delay * avctx->sample_rate + 2)
/ (1000000 * frame->subbands)) - 10, 4, 16) & ~3;
frame->allocation = SBC_AM_LOUDNESS;
d = frame->blocks * ((frame->mode == SBC_MODE_DUAL_CHANNEL) + 1);
frame->bitpool = (((avctx->bit_rate * frame->subbands * frame->blocks) / avctx->sample_rate)
- 4 * frame->subbands * avctx->channels
- (frame->mode == SBC_MODE_JOINT_STEREO)*frame->subbands - 32 + d/2) / d;
if (avctx->global_quality > 0)
frame->bitpool = avctx->global_quality / FF_QP2LAMBDA;
avctx->frame_size = 4*((frame->subbands >> 3) + 1) * 4*(frame->blocks >> 2);
}
for (int i = 0; avctx->codec->supported_samplerates[i]; i++)
if (avctx->sample_rate == avctx->codec->supported_samplerates[i])
frame->frequency = i;
frame->channels = avctx->channels;
frame->codesize = frame->subbands * frame->blocks * avctx->channels * 2;
frame->crc_ctx = av_crc_get_table(AV_CRC_8_EBU);
memset(&sbc->dsp.X, 0, sizeof(sbc->dsp.X));
sbc->dsp.position = (SBC_X_BUFFER_SIZE - frame->subbands * 9) & ~7;
sbc->dsp.increment = sbc->msbc ? 1 : 4;
ff_sbcdsp_init(&sbc->dsp);
return 0;
}
static int sbc_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
const AVFrame *av_frame, int *got_packet_ptr)
{
SBCEncContext *sbc = avctx->priv_data;
struct sbc_frame *frame = &sbc->frame;
uint8_t joint = frame->mode == SBC_MODE_JOINT_STEREO;
uint8_t dual = frame->mode == SBC_MODE_DUAL_CHANNEL;
int ret, j = 0;
int frame_length = 4 + (4 * frame->subbands * frame->channels) / 8
+ ((frame->blocks * frame->bitpool * (1 + dual)
+ joint * frame->subbands) + 7) / 8;
/* input must be large enough to encode a complete frame */
if (av_frame->nb_samples * frame->channels * 2 < frame->codesize)
return 0;
if ((ret = ff_alloc_packet2(avctx, avpkt, frame_length, 0)) < 0)
return ret;
/* Select the needed input data processing function and call it */
if (frame->subbands == 8)
sbc->dsp.position = sbc->dsp.sbc_enc_process_input_8s(
sbc->dsp.position, av_frame->data[0], sbc->dsp.X,
frame->subbands * frame->blocks, frame->channels);
else
sbc->dsp.position = sbc->dsp.sbc_enc_process_input_4s(
sbc->dsp.position, av_frame->data[0], sbc->dsp.X,
frame->subbands * frame->blocks, frame->channels);
sbc_analyze_audio(&sbc->dsp, &sbc->frame);
if (frame->mode == JOINT_STEREO)
j = sbc->dsp.sbc_calc_scalefactors_j(frame->sb_sample_f,
frame->scale_factor,
frame->blocks,
frame->subbands);
else
sbc->dsp.sbc_calc_scalefactors(frame->sb_sample_f,
frame->scale_factor,
frame->blocks,
frame->channels,
frame->subbands);
emms_c();
sbc_pack_frame(avpkt, frame, j, sbc->msbc);
*got_packet_ptr = 1;
return 0;
}
#define OFFSET(x) offsetof(SBCEncContext, x)
#define AE AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "sbc_delay", "set maximum algorithmic latency",
OFFSET(max_delay), AV_OPT_TYPE_DURATION, {.i64 = 13000}, 1000,13000, AE },
{ "msbc", "use mSBC mode (wideband speech mono SBC)",
OFFSET(msbc), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AE },
{ NULL },
};
static const AVClass sbc_class = {
.class_name = "sbc encoder",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVCodec ff_sbc_encoder = {
.name = "sbc",
.long_name = NULL_IF_CONFIG_SMALL("SBC (low-complexity subband codec)"),
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_SBC,
.priv_data_size = sizeof(SBCEncContext),
.init = sbc_encode_init,
.encode2 = sbc_encode_frame,
.capabilities = AV_CODEC_CAP_SMALL_LAST_FRAME,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
.channel_layouts = (const uint64_t[]) { AV_CH_LAYOUT_MONO,
AV_CH_LAYOUT_STEREO, 0},
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16,
AV_SAMPLE_FMT_NONE },
.supported_samplerates = (const int[]) { 16000, 32000, 44100, 48000, 0 },
.priv_class = &sbc_class,
.profiles = NULL_IF_CONFIG_SMALL(ff_sbc_profiles),
};