opus-sys 0.2.0

Bindings to libopus
Documentation 
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/* Copyright (c) 2007-2008 CSIRO
   Copyright (c) 2007-2009 Xiph.Org Foundation
   Copyright (c) 2008 Gregory Maxwell
   Written by Jean-Marc Valin and Gregory Maxwell */
/**
  @file celt.h
  @brief Contains all the functions for encoding and decoding audio
 */

/*
   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:

   - Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.

   - Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
   OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#ifndef CELT_H
#define CELT_H

#include "opus_types.h"
#include "opus_defines.h"
#include "opus_custom.h"
#include "entenc.h"
#include "entdec.h"
#include "arch.h"

#ifdef __cplusplus
extern "C" {
#endif

#define CELTEncoder OpusCustomEncoder
#define CELTDecoder OpusCustomDecoder
#define CELTMode OpusCustomMode

typedef struct {
   int valid;
   float tonality;
   float tonality_slope;
   float noisiness;
   float activity;
   float music_prob;
   int        bandwidth;
}AnalysisInfo;

#define __celt_check_mode_ptr_ptr(ptr) ((ptr) + ((ptr) - (const CELTMode**)(ptr)))

#define __celt_check_analysis_ptr(ptr) ((ptr) + ((ptr) - (const AnalysisInfo*)(ptr)))

/* Encoder/decoder Requests */

/* Expose this option again when variable framesize actually works */
#define OPUS_FRAMESIZE_VARIABLE              5010 /**< Optimize the frame size dynamically */


#define CELT_SET_PREDICTION_REQUEST    10002
/** Controls the use of interframe prediction.
    0=Independent frames
    1=Short term interframe prediction allowed
    2=Long term prediction allowed
 */
#define CELT_SET_PREDICTION(x) CELT_SET_PREDICTION_REQUEST, __opus_check_int(x)

#define CELT_SET_INPUT_CLIPPING_REQUEST    10004
#define CELT_SET_INPUT_CLIPPING(x) CELT_SET_INPUT_CLIPPING_REQUEST, __opus_check_int(x)

#define CELT_GET_AND_CLEAR_ERROR_REQUEST   10007
#define CELT_GET_AND_CLEAR_ERROR(x) CELT_GET_AND_CLEAR_ERROR_REQUEST, __opus_check_int_ptr(x)

#define CELT_SET_CHANNELS_REQUEST    10008
#define CELT_SET_CHANNELS(x) CELT_SET_CHANNELS_REQUEST, __opus_check_int(x)


/* Internal */
#define CELT_SET_START_BAND_REQUEST    10010
#define CELT_SET_START_BAND(x) CELT_SET_START_BAND_REQUEST, __opus_check_int(x)

#define CELT_SET_END_BAND_REQUEST    10012
#define CELT_SET_END_BAND(x) CELT_SET_END_BAND_REQUEST, __opus_check_int(x)

#define CELT_GET_MODE_REQUEST    10015
/** Get the CELTMode used by an encoder or decoder */
#define CELT_GET_MODE(x) CELT_GET_MODE_REQUEST, __celt_check_mode_ptr_ptr(x)

#define CELT_SET_SIGNALLING_REQUEST    10016
#define CELT_SET_SIGNALLING(x) CELT_SET_SIGNALLING_REQUEST, __opus_check_int(x)

#define CELT_SET_TONALITY_REQUEST    10018
#define CELT_SET_TONALITY(x) CELT_SET_TONALITY_REQUEST, __opus_check_int(x)
#define CELT_SET_TONALITY_SLOPE_REQUEST    10020
#define CELT_SET_TONALITY_SLOPE(x) CELT_SET_TONALITY_SLOPE_REQUEST, __opus_check_int(x)

#define CELT_SET_ANALYSIS_REQUEST    10022
#define CELT_SET_ANALYSIS(x) CELT_SET_ANALYSIS_REQUEST, __celt_check_analysis_ptr(x)

#define OPUS_SET_LFE_REQUEST    10024
#define OPUS_SET_LFE(x) OPUS_SET_LFE_REQUEST, __opus_check_int(x)

#define OPUS_SET_ENERGY_MASK_REQUEST    10026
#define OPUS_SET_ENERGY_MASK(x) OPUS_SET_ENERGY_MASK_REQUEST, __opus_check_val16_ptr(x)

/* Encoder stuff */

int celt_encoder_get_size(int channels);

int celt_encode_with_ec(OpusCustomEncoder * OPUS_RESTRICT st, const opus_val16 * pcm, int frame_size, unsigned char *compressed, int nbCompressedBytes, ec_enc *enc);

int celt_encoder_init(CELTEncoder *st, opus_int32 sampling_rate, int channels,
                      int arch);



/* Decoder stuff */

int celt_decoder_get_size(int channels);


int celt_decoder_init(CELTDecoder *st, opus_int32 sampling_rate, int channels);

int celt_decode_with_ec(OpusCustomDecoder * OPUS_RESTRICT st, const unsigned char *data, int len, opus_val16 * OPUS_RESTRICT pcm, int frame_size, ec_dec *dec);

#define celt_encoder_ctl opus_custom_encoder_ctl
#define celt_decoder_ctl opus_custom_decoder_ctl


#ifdef CUSTOM_MODES
#define OPUS_CUSTOM_NOSTATIC
#else
#define OPUS_CUSTOM_NOSTATIC static OPUS_INLINE
#endif

static const unsigned char trim_icdf[11] = {126, 124, 119, 109, 87, 41, 19, 9, 4, 2, 0};
/* Probs: NONE: 21.875%, LIGHT: 6.25%, NORMAL: 65.625%, AGGRESSIVE: 6.25% */
static const unsigned char spread_icdf[4] = {25, 23, 2, 0};

static const unsigned char tapset_icdf[3]={2,1,0};

#ifdef CUSTOM_MODES
static const unsigned char toOpusTable[20] = {
      0xE0, 0xE8, 0xF0, 0xF8,
      0xC0, 0xC8, 0xD0, 0xD8,
      0xA0, 0xA8, 0xB0, 0xB8,
      0x00, 0x00, 0x00, 0x00,
      0x80, 0x88, 0x90, 0x98,
};

static const unsigned char fromOpusTable[16] = {
      0x80, 0x88, 0x90, 0x98,
      0x40, 0x48, 0x50, 0x58,
      0x20, 0x28, 0x30, 0x38,
      0x00, 0x08, 0x10, 0x18
};

static OPUS_INLINE int toOpus(unsigned char c)
{
   int ret=0;
   if (c<0xA0)
      ret = toOpusTable[c>>3];
   if (ret == 0)
      return -1;
   else
      return ret|(c&0x7);
}

static OPUS_INLINE int fromOpus(unsigned char c)
{
   if (c<0x80)
      return -1;
   else
      return fromOpusTable[(c>>3)-16] | (c&0x7);
}
#endif /* CUSTOM_MODES */

#define COMBFILTER_MAXPERIOD 1024
#define COMBFILTER_MINPERIOD 15

extern const signed char tf_select_table[4][8];

int resampling_factor(opus_int32 rate);

void celt_preemphasis(const opus_val16 * OPUS_RESTRICT pcmp, celt_sig * OPUS_RESTRICT inp,
                        int N, int CC, int upsample, const opus_val16 *coef, celt_sig *mem, int clip);

void comb_filter(opus_val32 *y, opus_val32 *x, int T0, int T1, int N,
      opus_val16 g0, opus_val16 g1, int tapset0, int tapset1,
      const opus_val16 *window, int overlap);

void init_caps(const CELTMode *m,int *cap,int LM,int C);

#ifdef RESYNTH
void deemphasis(celt_sig *in[], opus_val16 *pcm, int N, int C, int downsample, const opus_val16 *coef, celt_sig *mem, celt_sig * OPUS_RESTRICT scratch);

void compute_inv_mdcts(const CELTMode *mode, int shortBlocks, celt_sig *X,
      celt_sig * OPUS_RESTRICT out_mem[], int C, int LM);
#endif

#ifdef __cplusplus
}
#endif

#endif /* CELT_H */