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Commit bdf25f5c authored by Jakub Pawłowski's avatar Jakub Pawłowski Committed by Android (Google) Code Review
Browse files

Merge "Update LC3" into tm-dev

parents e43c62ef ff434a8a

system/embdrv/lc3/include/lc3.h

+14 −9
Original line number Diff line number Diff line 
/******************************************************************************

 *

 *  Copyright 2021 Google, Inc.

 *  Copyright 2022 Google LLC

 *

 *  Licensed under the Apache License, Version 2.0 (the "License");

 *  you may not use this file except in compliance with the License.
@@ -39,17 +39,17 @@ 
 *   it can follow a temporary bandwidth increase or reduction.

 *

 * - Unlike classic codecs, the LC3 codecs does not run on fixed amount

 *   of samples as input. It operate only on fixed frame duration, for

 *   any supported samplerates (8 to 48 KHz). Two frame duration are

 *   of samples as input. It operates only on fixed frame duration, for

 *   any supported samplerates (8 to 48 KHz). Two frames duration are

 *   available 7.5ms and 10ms.

 *

 *

 * --- About 44.1 KHz samplerate ---

 *

 * The Bluetooth specification oddly add the 44.1 KHz samplerate. Although

 * there is NO SUPPORT in the core algorithm of the codec of 44.1 KHz.

 * The Bluetooth specification reference the 44.1 KHz samplerate, although

 * there is no support in the core algorithm of the codec of 44.1 KHz.

 * We can summarize the 44.1 KHz support by "you can put any samplerate

 * around the base defined samplerates". But be concerned by :

 * around the defined base samplerates". Please mind the following items :

 *

 *   1. The frame size will not be 7.5 ms or 10 ms, but is scaled

 *      by 'supported samplerate' / 'input samplerate'
@@ -68,7 +68,7 @@ 
 *

 * --- How to encode / decode ---

 *

 * An encoder / decoder context need to be setup. This context keep states

 * An encoder / decoder context needs to be setup. This context keeps states

 * on the current stream to proceed, and samples that overlapped across

 * frames.

 *
@@ -96,12 +96,17 @@ 
 *

 * Next, call the `lc3_encode()` encoding procedure, for each frames.

 * To handle multichannel streams (Stereo or more), you can proceed with

 * inerleaved channels PCM stream like this :

 * interleaved channels PCM stream like this :

 *

 *   | for(int ich = 0; ich < nch: ich++)

 *   |     lc3_encode(encoder[ich], pcm + ich, nch, ...);

 *

 *   with `nch` as the number of channels in the PCM stream

 *

 * ---

 *

 * Antoine SOULIER, Tempow / Google LLC

 *

 */



#ifndef __LC3_H
@@ -192,7 +197,7 @@ int lc3_frame_samples(int dt_us, int sr_hz); 
/**

 * Return the size of frames, from bitrate

 * dt_us           Frame duration in us, 7500 or 10000

 * bitrate         Target bitrate in bit per seconds

 * bitrate         Target bitrate in bit per second

 * return          The floor size in bytes of the frames, -1 on bad parameters

 */

int lc3_frame_bytes(int dt_us, int bitrate);

system/embdrv/lc3/include/lc3_private.h

+21 −15
Original line number Diff line number Diff line 
/******************************************************************************

 *

 *  Copyright 2015 Google, Inc.

 *  Copyright 2022 Google LLC

 *

 *  Licensed under the Apache License, Version 2.0 (the "License");

 *  you may not use this file except in compliance with the License.
@@ -26,7 +26,8 @@ 
/**

 * Return number of samples, delayed samples and

 * encoded spectrum coefficients within a frame

 * For decoding, add number of samples of 18 ms history

 * - For encoding, keep 1.25 ms of temporal winodw

 * - For decoding, keep 18 ms of history, aligned on frames, and a frame

 */



#define __LC3_NS(dt_us, sr_hz) \
@@ -36,8 +37,11 @@ 
    ( (dt_us) == 7500 ? 23 * __LC3_NS(dt_us, sr_hz) / 30 \

                      :  5 * __LC3_NS(dt_us, sr_hz) /  8 )



#define __LC3_NH(sr_hz) \

    ( (18 * sr_hz) / 1000 )

#define __LC3_NT(sr_hz) \

    ( (5 * sr_hz) / 4000 )



#define __LC3_NH(dt_us, sr_hz) \

    ( ((3 - ((dt_us) >= 10000)) + 1) * __LC3_NS(dt_us, sr_hz) )





/**
@@ -71,12 +75,12 @@ enum lc3_srate { 
 */



typedef struct lc3_attdet_analysis {

    float en1, an1;

    int32_t en1, an1;

    int p_att;

} lc3_attdet_analysis_t;



struct lc3_ltpf_hp50_state {

    float s1, s2;

    int64_t s1, s2;

};



typedef struct lc3_ltpf_analysis {
@@ -85,8 +89,8 @@ typedef struct lc3_ltpf_analysis { 
    float nc[2];



    struct lc3_ltpf_hp50_state hp50;

    float x_12k8[384];

    float x_6k4[178];

    int16_t x_12k8[384];

    int16_t x_6k4[178];

    int tc;

} lc3_ltpf_analysis_t;
@@ -103,11 +107,13 @@ struct lc3_encoder { 
    lc3_ltpf_analysis_t ltpf;

    lc3_spec_analysis_t spec;



    float *xs, *xf, s[0];

    int16_t *xt;

    float *xs, *xd, s[0];

};



#define LC3_ENCODER_BUFFER_COUNT(dt_us, sr_hz) \

    ( 2*__LC3_NS(dt_us, sr_hz) + __LC3_ND(dt_us, sr_hz) )

    ( ( __LC3_NS(dt_us, sr_hz) + __LC3_NT(sr_hz) ) / 2 + \

        __LC3_NS(dt_us, sr_hz) + __LC3_ND(dt_us, sr_hz) )



#define LC3_ENCODER_MEM_T(dt_us, sr_hz) \

    struct { \
@@ -123,7 +129,7 @@ struct lc3_encoder { 
typedef struct lc3_ltpf_synthesis {

    bool active;

    int pitch;

    float c[12][2], x[12];

    float c[2*12], x[12];

} lc3_ltpf_synthesis_t;



typedef struct lc3_plc_state {
@@ -139,12 +145,12 @@ struct lc3_decoder { 
    lc3_ltpf_synthesis_t ltpf;

    lc3_plc_state_t plc;



    float *xs, *xd, *xg, s[0];

    float *xh, *xs, *xd, *xg, s[0];

};



#define LC3_DECODER_BUFFER_COUNT(dt_us, sr_hz) \

    ( __LC3_NH(sr_hz) +  __LC3_NS(dt_us, sr_hz) + \

      __LC3_ND(dt_us, sr_hz) + __LC3_NS(dt_us, sr_hz) )

    ( __LC3_NH(dt_us, sr_hz) + __LC3_ND(dt_us, sr_hz) + \

      __LC3_NS(dt_us, sr_hz) )



#define LC3_DECODER_MEM_T(dt_us, sr_hz) \

    struct { \

system/embdrv/lc3/src/attdet.c

+18 −18
Original line number Diff line number Diff line 
/******************************************************************************

 *

 *  Copyright 2021 Google, Inc.

 *  Copyright 2022 Google LLC

 *

 *  Licensed under the Apache License, Version 2.0 (the "License");

 *  you may not use this file except in compliance with the License.
@@ -23,7 +23,7 @@ 
 * Time domain attack detector

 */

bool lc3_attdet_run(enum lc3_dt dt, enum lc3_srate sr,

    int nbytes, struct lc3_attdet_analysis *attdet, const float *x)

    int nbytes, struct lc3_attdet_analysis *attdet, const int16_t *x)

{

    /* --- Check enabling --- */
@@ -40,32 +40,32 @@ bool lc3_attdet_run(enum lc3_dt dt, enum lc3_srate sr, 
    /* --- Filtering & Energy calculation --- */



    int nblk = 4 - (dt == LC3_DT_7M5);

    float e[4];

    int32_t e[4];



    for (int i = 0; i < nblk; i++) {

        e[i] = 0;



        if (sr == LC3_SRATE_32K) {

            float xn2 = x[-4] + x[-3];

            float xn1 = x[-2] + x[-1];

            float xn, xf;

            int16_t xn2 = (x[-4] + x[-3]) >> 1;

            int16_t xn1 = (x[-2] + x[-1]) >> 1;

            int16_t xn, xf;



            for (int j = 0; j < 40; j++, x += 2, xn2 = xn1, xn1 = xn) {

                xn = x[0] + x[1];

                xf = 0.375 * xn - 0.5 * xn1 + 0.125 * xn2;

                e[i] += xf * xf;

                xn = (x[0] + x[1]) >> 1;

                xf = (3 * xn - 4 * xn1 + 1 * xn2) >> 3;

                e[i] += (xf * xf) >> 5;

            }

        }



        else {

            float xn2 = x[-6] + x[-5] + x[-4];

            float xn1 = x[-3] + x[-2] + x[-1];

            float xn, xf;

            int16_t xn2 = (x[-6] + x[-5] + x[-4]) >> 2;

            int16_t xn1 = (x[-3] + x[-2] + x[-1]) >> 2;

            int16_t xn, xf;



            for (int j = 0; j < 40; j++, x += 3, xn2 = xn1, xn1 = xn) {

                xn = x[0] + x[1] + x[2];

                xf = 0.375 * xn - 0.5 * xn1 + 0.125 * xn2;

                e[i] += xf * xf;

                xn = (x[0] + x[1] + x[2]) >> 2;

                xf = (3 * xn - 4 * xn1 + 1 * xn2) >> 3;

                e[i] += (xf * xf) >> 5;

            }

        }

    }
@@ -75,13 +75,13 @@ bool lc3_attdet_run(enum lc3_dt dt, enum lc3_srate sr, 
     * in such way, it will be initialized to 0 */



    int p_att = 0;

    float a[4];

    int32_t a[4];



    for (int i = 0; i < nblk; i++) {

        a[i] = fmaxf(0.25 * attdet->an1, attdet->en1);

        a[i] = LC3_MAX(attdet->an1 >> 2, attdet->en1);

        attdet->en1 = e[i], attdet->an1 = a[i];



        if (e[i] > 8.5 * a[i])

        if ((e[i] >> 3) > a[i] + (a[i] >> 4))

            p_att = i + 1;

    }

system/embdrv/lc3/src/attdet.h

+2 −2
Original line number Diff line number Diff line 
/******************************************************************************

 *

 *  Copyright 2021 Google, Inc.

 *  Copyright 2022 Google LLC

 *

 *  Licensed under the Apache License, Version 2.0 (the "License");

 *  you may not use this file except in compliance with the License.
@@ -38,7 +38,7 @@ 
 * return          1: Attack detected  0: Otherwise

 */

bool lc3_attdet_run(enum lc3_dt dt, enum lc3_srate sr,

    int nbytes, lc3_attdet_analysis_t *attdet, const float *x);

    int nbytes, lc3_attdet_analysis_t *attdet, const int16_t *x);





#endif /* __LC3_ATTDET_H */

system/embdrv/lc3/src/bits.c

+6 −6
Original line number Diff line number Diff line 
/******************************************************************************

 *

 *  Copyright 2021 Google, Inc.

 *  Copyright 2022 Google LLC

 *

 *  Licensed under the Apache License, Version 2.0 (the "License");

 *  you may not use this file except in compliance with the License.
@@ -167,7 +167,7 @@ static inline void ac_put(struct lc3_bits_buffer *buffer, int byte) 
 * ac              Arithmetic coder

 * buffer          Bitstream buffer

 */

static inline void ac_shift(

LC3_HOT static inline void ac_shift(

    struct lc3_bits_ac *ac, struct lc3_bits_buffer *buffer)

{

    if (ac->low < 0xff0000 || ac->carry)
@@ -262,7 +262,7 @@ void lc3_flush_bits(struct lc3_bits *bits) 
 * Write from 1 to 32 bits,

 * exceeding the capacity of the accumulator

 */

void lc3_put_bits_generic(struct lc3_bits *bits, unsigned v, int n)

LC3_HOT void lc3_put_bits_generic(struct lc3_bits *bits, unsigned v, int n)

{

    struct lc3_bits_accu *accu = &bits->accu;
@@ -285,7 +285,7 @@ void lc3_put_bits_generic(struct lc3_bits *bits, unsigned v, int n) 
/**

 * Arithmetic coder renormalization

 */

void lc3_ac_write_renorm(struct lc3_bits *bits)

LC3_HOT void lc3_ac_write_renorm(struct lc3_bits *bits)

{

    struct lc3_bits_ac *ac = &bits->ac;
@@ -336,7 +336,7 @@ static inline void accu_load(struct lc3_bits_accu *accu, 
 * Read from 1 to 32 bits,

 * exceeding the capacity of the accumulator

 */

unsigned lc3_get_bits_generic(struct lc3_bits *bits, int n)

LC3_HOT unsigned lc3_get_bits_generic(struct lc3_bits *bits, int n)

{

    struct lc3_bits_accu *accu = &bits->accu;

    struct lc3_bits_buffer *buffer = &bits->buffer;
@@ -366,7 +366,7 @@ unsigned lc3_get_bits_generic(struct lc3_bits *bits, int n) 
/**

 * Arithmetic coder renormalization

 */

void lc3_ac_read_renorm(struct lc3_bits *bits)

LC3_HOT void lc3_ac_read_renorm(struct lc3_bits *bits)

{

    struct lc3_bits_ac *ac = &bits->ac;