modes.c

SPeex语音压缩算法的静态连接库和源代码

static const SpeexSubmode wb_submode2 = {
   0,
   0,
   1,
   0,
   /*LSP quantization*/
   lsp_quant_high,
   lsp_unquant_high,
   /*Pitch quantization*/
   NULL,
   NULL,
   NULL,
   /*Innovation quantization*/
   split_cb_search_shape_sign,
   split_cb_shape_sign_unquant,
   &split_cb_high_lbr,
#ifdef FIXED_POINT
   27853, 19661, 8192, -1,
#else
   .85, .6, .25, -1,
#endif
   112
};


static const SpeexSubmode wb_submode3 = {
   0,
   0,
   1,
   0,
   /*LSP quantization*/
   lsp_quant_high,
   lsp_unquant_high,
   /*Pitch quantization*/
   NULL,
   NULL,
   NULL,
   /*Innovation quantization*/
   split_cb_search_shape_sign,
   split_cb_shape_sign_unquant,
   &split_cb_high,

#ifdef FIXED_POINT
   24576, 22938, 1638, -1,
#else
   .75, .7, .05, -1,
#endif
   192
};

static const SpeexSubmode wb_submode4 = {
   0,
   0,
   1,
   1,
   /*LSP quantization*/
   lsp_quant_high,
   lsp_unquant_high,
   /*Pitch quantization*/
   NULL,
   NULL,
   NULL,
   /*Innovation quantization*/
   split_cb_search_shape_sign,
   split_cb_shape_sign_unquant,
   &split_cb_high,
#ifdef FIXED_POINT
   24576, 24576, 0, -1,
#else
   .75, .75, .0, -1,
#endif
   352
};


/* Split-band wideband CELP mode*/
static const SpeexSBMode sb_wb_mode = {
   &speex_nb_mode,
   160,    /*frameSize*/
   40,     /*subframeSize*/
   8,     /*lpcSize*/
   640,    /*bufSize*/
#ifdef FIXED_POINT
   29491, 19661, /* gamma1, gamma2 */
#else
   0.9, 0.6, /* gamma1, gamma2 */
#endif
   .001,   /*lag_factor*/
   1.0001, /*lpc_floor*/
   0.9,
   {NULL, &wb_submode1, &wb_submode2, &wb_submode3, &wb_submode4, NULL, NULL, NULL},
   3,
   {1, 8, 2, 3, 4, 5, 5, 6, 6, 7, 7},
   {1, 1, 1, 1, 1, 1, 2, 2, 3, 3, 4},
   vbr_hb_thresh,
   5
};


const SpeexMode speex_wb_mode = {
   &sb_wb_mode,
   wb_mode_query,
   "wideband (sub-band CELP)",
   1,
   4,
   &sb_encoder_init,
   &sb_encoder_destroy,
   &sb_encode,
   &sb_decoder_init,
   &sb_decoder_destroy,
   &sb_decode,
   &sb_encoder_ctl,
   &sb_decoder_ctl,
};



/* "Ultra-wideband" mode stuff */



/* Split-band "ultra-wideband" (32 kbps) CELP mode*/
static const SpeexSBMode sb_uwb_mode = {
   &speex_wb_mode,
   320,    /*frameSize*/
   80,     /*subframeSize*/
   8,     /*lpcSize*/
   1280,    /*bufSize*/
#ifdef FIXED_POINT
   29491, 19661, /* gamma1, gamma2 */
#else
   0.9, 0.6, /* gamma1, gamma2 */
#endif
   .002,   /*lag_factor*/
   1.0001, /*lpc_floor*/
   0.7,
   {NULL, &wb_submode1, NULL, NULL, NULL, NULL, NULL, NULL},
   1,
   {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10},
   {0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1},
   vbr_uhb_thresh,
   2
};


const SpeexMode speex_uwb_mode = {
   &sb_uwb_mode,
   wb_mode_query,
   "ultra-wideband (sub-band CELP)",
   2,
   4,
   &sb_encoder_init,
   &sb_encoder_destroy,
   &sb_encode,
   &sb_decoder_init,
   &sb_decoder_destroy,
   &sb_decode,
   &sb_encoder_ctl,
   &sb_decoder_ctl,
};




#ifdef EPIC_48K

extern const signed char gain_cdbk_ulbr[];
extern const signed char exc_12_32_table[];

/* Parameters for Long-Term Prediction (LTP)*/
static const ltp_params ltp_params_48k = {
   gain_cdbk_ulbr,
   3,
   0
};

static const split_cb_params split_cb_nb_48k = {
   12,               /*subvect_size*/
   4,               /*nb_subvect*/
   exc_12_32_table, /*shape_cb*/
   5,               /*shape_bits*/
   0,
};


/* 4.8 kbps very low bit-rate mode */
static const SpeexSubmode nb_48k_submode = {
   0,
   0,
   0,
   0,
   /*LSP quantization*/
   lsp_quant_48k,
   lsp_unquant_48k,
   /*No pitch quantization*/
   pitch_search_3tap,
   pitch_unquant_3tap,
   &ltp_params_48k,
   /*Innovation quantization*/
   split_cb_search_shape_sign,
   split_cb_shape_sign_unquant,
   &split_cb_nb_48k,
#ifdef FIXED_POINT
   22938, 16384, 11796, 18022,
#else
   0.7, 0.5, .36, .55,
#endif
   144
};


/* Special, non-standard 4.8 kbps mode */
static const SpeexNBMode nb_48k_mode = {
   240,    /*frameSize*/
   48,     /*subframeSize*/
   10,     /*lpcSize*/
   640,    /*bufSize*/
   17,     /*pitchStart*/
   144,    /*pitchEnd*/
   0.9,    /*gamma1*/
   0.6,    /*gamma2*/
   .01,   /*lag_factor*/
   1.0003, /*lpc_floor*/
   1,
   {NULL, NULL, &nb_48k_submode, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
   2,
   {2,2,2,2,2,2,2,2,2,2,2}
};


/* Default mode for narrowband */
const SpeexMode speex_nb_48k_mode = {
   &nb_48k_mode,
   nb_mode_query,
   "narrowband 4.8 kbps",
   1000,
   4,
   &nb_encoder_init,
   &nb_encoder_destroy,
   &nb_encode,
   &nb_decoder_init,
   &nb_decoder_destroy,
   &nb_decode,
   &nb_encoder_ctl,
   &nb_decoder_ctl,
};


#endif



void *speex_encoder_init(const SpeexMode *mode)
{
   return mode->enc_init(mode);
}

void *speex_decoder_init(const SpeexMode *mode)
{
   return mode->dec_init(mode);
}

void speex_encoder_destroy(void *state)
{
   (*((SpeexMode**)state))->enc_destroy(state);
}

void speex_decoder_destroy(void *state)
{
   (*((SpeexMode**)state))->dec_destroy(state);
}



int speex_encode_native(void *state, spx_word16_t *in, SpeexBits *bits)
{
   return (*((SpeexMode**)state))->enc(state, in, bits);
}

int speex_decode_native(void *state, SpeexBits *bits, spx_word16_t *out)
{
   return (*((SpeexMode**)state))->dec(state, bits, out);
}



#ifdef FIXED_POINT

int speex_encode(void *state, float *in, SpeexBits *bits)
{
   int i;
   int N;
   short short_in[MAX_IN_SAMPLES];
   speex_encoder_ctl(state, SPEEX_GET_FRAME_SIZE, &N);
   for (i=0;i<N;i++)
   {
      if (in[i]>32767.f)
         short_in[i] = 32767;
      else if (in[i]<-32768.f)
         short_in[i] = -32768;
      else
         short_in[i] = (short)floor(.5+in[i]);
   }
   return (*((SpeexMode**)state))->enc(state, short_in, bits);
}

int speex_encode_int(void *state, short *in, SpeexBits *bits)
{
   return (*((SpeexMode**)state))->enc(state, in, bits);
}

int speex_decode(void *state, SpeexBits *bits, float *out)
{
   int i, ret;
   int N;
   float short_out[MAX_IN_SAMPLES];
   speex_decoder_ctl(state, SPEEX_GET_FRAME_SIZE, &N);
   ret = (*((SpeexMode**)state))->dec(state, bits, short_out);
   for (i=0;i<N;i++)
      out[i] = short_out[i];
   return ret;
}

int speex_decode_int(void *state, SpeexBits *bits, short *out)
{
   return (*((SpeexMode**)state))->dec(state, bits, out);
}

#else

int speex_encode(void *state, float *in, SpeexBits *bits)
{
   return (*((SpeexMode**)state))->enc(state, in, bits);
}

int speex_encode_int(void *state, short *in, SpeexBits *bits)
{
   int i;
   int N;
   float float_in[MAX_IN_SAMPLES];
   speex_encoder_ctl(state, SPEEX_GET_FRAME_SIZE, &N);
   for (i=0;i<N;i++)
      float_in[i] = in[i];
   return (*((SpeexMode**)state))->enc(state, float_in, bits);
}

int speex_decode(void *state, SpeexBits *bits, float *out)
{
   return (*((SpeexMode**)state))->dec(state, bits, out);
}

int speex_decode_int(void *state, SpeexBits *bits, short *out)
{
   int i;
   int N;
   float float_out[MAX_IN_SAMPLES];
   int ret;
   speex_decoder_ctl(state, SPEEX_GET_FRAME_SIZE, &N);
   ret = (*((SpeexMode**)state))->dec(state, bits, float_out);
   for (i=0;i<N;i++)
   {
      if (float_out[i]>32767.f)
         out[i] = 32767;
      else if (float_out[i]<-32768.f)
         out[i] = -32768;
      else
         out[i] = (short)floor(.5+float_out[i]);
   }
   return ret;
}
#endif



int speex_encoder_ctl(void *state, int request, void *ptr)
{
   return (*((SpeexMode**)state))->enc_ctl(state, request, ptr);
}

int speex_decoder_ctl(void *state, int request, void *ptr)
{
   return (*((SpeexMode**)state))->dec_ctl(state, request, ptr);
}



static int nb_mode_query(const void *mode, int request, void *ptr)
{
   const SpeexNBMode *m = (const SpeexNBMode*)mode;
   
   switch (request)
   {
   case SPEEX_MODE_FRAME_SIZE:
      *((int*)ptr)=m->frameSize;
      break;
   case SPEEX_SUBMODE_BITS_PER_FRAME:
      if (*((int*)ptr)==0)
         *((int*)ptr) = NB_SUBMODE_BITS+1;
      else if (m->submodes[*((int*)ptr)]==NULL)
         *((int*)ptr) = -1;
      else
         *((int*)ptr) = m->submodes[*((int*)ptr)]->bits_per_frame;
      break;
   default:
      speex_warning_int("Unknown nb_mode_query request: ", request);
      return -1;
   }
   return 0;
}

static int wb_mode_query(const void *mode, int request, void *ptr)
{
   const SpeexSBMode *m = (const SpeexSBMode*)mode;

   switch (request)
   {
   case SPEEX_MODE_FRAME_SIZE:
      *((int*)ptr)=2*m->frameSize;
      break;
   case SPEEX_SUBMODE_BITS_PER_FRAME:
      if (*((int*)ptr)==0)
         *((int*)ptr) = SB_SUBMODE_BITS+1;
      else if (m->submodes[*((int*)ptr)]==NULL)
         *((int*)ptr) = -1;
      else
         *((int*)ptr) = m->submodes[*((int*)ptr)]->bits_per_frame;
      break;
   default:
      speex_warning_int("Unknown wb_mode_query request: ", request);
      return -1;
   }
   return 0;
}


int speex_mode_query(const SpeexMode *mode, int request, void *ptr)
{
   return mode->query(mode->mode, request, ptr);
}