File: psycho_1.c

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/*
 *	TwoLAME: an optimized MPEG Audio Layer Two encoder
 *
 *	Copyright (C) 2001-2004 Michael Cheng
 *	Copyright (C) 2004-2006 The TwoLAME Project
 *
 *	This library 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.
 *
 *	This library 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 this library; if not, write to the Free Software
 *	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  $Id: psycho_1.c 156 2007-03-20 23:57:35Z nhumfrey $
 *
 */


#include <stdio.h>
#include <stdlib.h>
#include <math.h>

#include "twolame.h"
#include "common.h"
#include "mem.h"
#include "fft.h"
#include "psycho_1.h"

/**********************************************************************

		This module implements the psychoacoustic model I for the
 MPEG encoder layer II. It uses simplified tonal and noise masking
 threshold analysis to generate SMR for the encoder bit allocation
 routine.

**********************************************************************/


static int *psycho_1_read_cbound (int lay, int freq, int *crit_band)	
/* this function reads in critical	band boundaries */
{

#include "psycho_1_critband.h"
  int *cbound;
  int i, k;

  if ((lay < 1) || (lay > 2)) {
	printf ("Internal error (read_cbound())\n");
	return (NULL);
  }
  if ((freq < 0) || (freq > 6) || (freq == 3)) {
	printf ("Internal error (read_cbound())\n");
	return (NULL);
  }

  *crit_band = SecondCriticalBand[freq][0];
  cbound = (int *) TWOLAME_MALLOC(sizeof (int) * *crit_band);
  for (i = 0; i < *crit_band; i++) {
	k = SecondCriticalBand[freq][i + 1];
	if (k != 0) {
	  cbound[i] = k;
	} else {
	  printf ("Internal error (read_cbound())\n");
	  return (NULL);
	}
  }
  return(cbound);
}

/* reads in the frequency bands and bark values */
static void psycho_1_read_freq_band (g_ptr *ltg, int lay, int freq, int *sub_size)	{

#include "psycho_1_freqtable.h"

  int i, k;

  if ((freq < 0) || (freq > 6) || (freq == 3)) {
	printf ("Internal error (read_freq_band())\n");
	return;
  }

  /* read input for freq. subbands */

  *sub_size = SecondFreqEntries[freq] + 1;
  *ltg = (g_ptr) TWOLAME_MALLOC(sizeof (g_thres) * *sub_size);
  (*ltg)[0].line = 0;		/* initialize global masking threshold */
  (*ltg)[0].bark = 0.0;
  (*ltg)[0].hear = 0.0;
  for (i = 1; i < *sub_size; i++) {
	k = SecondFreqSubband[freq][i - 1].line;
	if (k != 0) {
	  (*ltg)[i].line = k;
	  (*ltg)[i].bark = SecondFreqSubband[freq][i - 1].bark;
	  (*ltg)[i].hear = SecondFreqSubband[freq][i - 1].hear;
	} else {
	  printf ("Internal error (read_freq_band())\n");
	return;
	}
  }
}


static void psycho_1_make_map (int sub_size, mask power[HAN_SIZE], g_thres * ltg)
/* this function calculates the global masking threshold */
{
  int i, j;

  for (i = 1; i < sub_size; i++)
	for (j = ltg[i - 1].line; j <= ltg[i].line; j++)
	  power[j].map = i;
}

static void psycho_1_init_add_db (psycho_1_mem *mem)
{
  int i;
  FLOAT x;
  for (i = 0; i < DBTAB; i++) {
	x = (FLOAT) i / 10.0;
	mem->dbtable[i] = 10 * log10 (1 + pow (10.0, x / 10.0)) - x;
  }
}

static inline FLOAT add_db (psycho_1_mem *mem, FLOAT a, FLOAT b)
{
  /* MFC - if the difference between a and b is large (>99), then just return the
	 largest one. (about 10% of the time)
	 - For differences between 0 and 99, return the largest value, but add
	 in a pre-calculated difference value.	
	 - the value 99 was chosen arbitarily.
	 - maximum (a-b) i've seen is 572 */
  FLOAT fdiff;
  int idiff;
  fdiff = (10.0 * (a - b));

  if (fdiff > 990.0) {
	return a;
  }
  if (fdiff < -990.0) {
	return (b);
  }

  idiff = (int) fdiff;
  if (idiff >= 0) {
	return (a + mem->dbtable[idiff]);
  }

  return (b + mem->dbtable[-idiff]);
}

/****************************************************************
*		Window the samples then, 
*		 Fast Fourier transform of the input samples.
* 
*	(  call the FHT-based fft() in fft.c )
*	 
*
****************************************************************/
static void psycho_1_hann_fft_pickmax (FLOAT sample[FFT_SIZE], mask power[HAN_SIZE],
			   FLOAT spike[SBLIMIT], FLOAT energy[FFT_SIZE])
{
  FLOAT x_real[FFT_SIZE];
  register int i, j;
  register FLOAT sqrt_8_over_3;
  static int init = 0;
  static FLOAT window[FFT_SIZE];
  FLOAT sum;

  if (!init) {			
	/* calculate window function for the Fourier transform */
	/* These values need only be initiliased once, regardless of the caller */
	sqrt_8_over_3 = pow (8.0 / 3.0, 0.5);
	for (i = 0; i < FFT_SIZE; i++) {
	  /* Hann window formula */
	  window[i] =
	sqrt_8_over_3 * 0.5 * (1 -
				   cos (2.0 * PI * i / (FFT_SIZE))) / FFT_SIZE;
	}
	init = 1;
  }
  for (i = 0; i < FFT_SIZE; i++)
	x_real[i] = (FLOAT) (sample[i] * window[i]);

  psycho_1_fft (x_real, energy, FFT_SIZE);

  for (i = 0; i < HAN_SIZE; i++) {	/* calculate power density spectrum */
	if (energy[i] < 1E-20)
	  power[i].x = -200.0 + POWERNORM;
	else
	  power[i].x = 10 * log10 (energy[i]) + POWERNORM;
	power[i].next = STOP;
	power[i].type = FALSE;
  }

  /* Calculate the sum of spectral component in each subband from bound 4-16 */

#define CF 1073741824		/* pow(10, 0.1*POWERNORM) */
#define DBM	 1E-20		/* pow(10.0, 0.1*DBMIN */
  for (i = 0; i < HAN_SIZE; spike[i >> 4] = 10.0 * log10 (sum), i += 16) {
	for (j = 0, sum = DBM; j < 16; j++)
	  sum += CF * energy[i + j];
  }
}

/****************************************************************
*
*		 This function labels the tonal component in the power
* spectrum.
*
****************************************************************/

static void psycho_1_tonal_label (psycho_1_mem *mem, int *tone)
/* this function extracts (tonal)  sinusoidals from the spectrum  */
{
  int i, j, last = LAST, first, run, last_but_one = LAST;	/* dpwe */
  FLOAT max;
  mask *power = mem->power;

  *tone = LAST;
  for (i = 2; i < HAN_SIZE - 12; i++) {
	if (power[i].x > power[i - 1].x && power[i].x >= power[i + 1].x) {
	  power[i].type = TONE;
	  power[i].next = LAST;
	  if (last != LAST)
	power[last].next = i;
	  else
	first = *tone = i;
	  last = i;
	}
  }
  last = LAST;
  first = *tone;
  *tone = LAST;
  while ((first != LAST) && (first != STOP)) {	/* the conditions for the tonal			 */
	if (first < 3 || first > 500)
	  run = 0;			/* otherwise k+/-j will be out of bounds */
	else if (first < 63)
	  run = 2;			/* components in layer II, which		 */
	else if (first < 127)
	  run = 3;			/* are the boundaries for calc.			 */
	else if (first < 255)
	  run = 6;			/* the tonal components					 */
	else
	  run = 12;
	max = power[first].x - 7;	/* after calculation of tonal	*/
	for (j = 2; j <= run; j++)	/* components, set to local max */
	  if (max < power[first - j].x || max < power[first + j].x) {
	power[first].type = FALSE;
	break;
	  }
	if (power[first].type == TONE) {	/* extract tonal components */
	  int help = first;
	  if (*tone == LAST)
	*tone = first;
	  while ((power[help].next != LAST) && (power[help].next - first) <= run)
	help = power[help].next;
	  help = power[help].next;
	  power[first].next = help;
	  if ((first - last) <= run) {
	if (last_but_one != LAST)
	  power[last_but_one].next = first;
	  }
	  if (first > 1 && first < 500) {	/* calculate the sum of the */
	FLOAT tmp;		/* powers of the components */
	tmp = add_db (mem, power[first - 1].x, power[first + 1].x);
	power[first].x = add_db (mem, power[first].x, tmp);
	  }
	  for (j = 1; j <= run; j++) {
	power[first - j].x = power[first + j].x = DBMIN;
	power[first - j].next = power[first + j].next = STOP;
	power[first - j].type = power[first + j].type = FALSE;
	  }
	  last_but_one = last;
	  last = first;
	  first = power[first].next;
	} else {
	  int ll;
	  if (last == LAST);	/* *tone = power[first].next; dpwe */
	  else
	power[last].next = power[first].next;
	  ll = first;
	  first = power[first].next;
	  power[ll].next = STOP;
	}
  }
}

/****************************************************************
*
*		 This function groups all the remaining non-tonal
* spectral lines into critical band where they are replaced by
* one single line.
*
****************************************************************/

static void psycho_1_noise_label (psycho_1_mem *mem, int *noise,
		FLOAT energy[FFT_SIZE])
{
  int i, j, centre, last = LAST;
  FLOAT index, weight, sum;
  int crit_band = mem->crit_band;
  int *cbound = mem->cbound;
  mask *power = mem->power;
  /* calculate the remaining spectral */
  for (i = 0; i < crit_band - 1; i++) { /* lines for non-tonal components	*/
	for (j = cbound[i], weight = 0.0, sum = DBMIN; j < cbound[i + 1]; j++) {
	  if (power[j].type != TONE) {
	if (power[j].x != DBMIN) {
	  sum = add_db (mem, power[j].x, sum);
	  /* Weight is used in finding the geometric mean of the noise energy within a subband */
	  weight += CF * energy[j] * (FLOAT) (j - cbound[i]) / (FLOAT) (cbound[i + 1] - cbound[i]); /* correction */
	  power[j].x = DBMIN;
	}
	  }				/*	check to see if the spectral line is low dB, and if	 */
	}				/* so replace the center of the critical band, which is */
	/* the center freq. of the noise component				*/

	if (sum <= DBMIN)
	  centre = (cbound[i + 1] + cbound[i]) / 2;
	else {
	  /* fprintf(stderr, "%i [%f %f] -", count++,weight/pow(10.0,0.1*sum), weight*pow(10.0,-0.1*sum)); */
	  index = weight * pow (10.0, -0.1 * sum);
	  centre =
	cbound[i] + (int) (index * (FLOAT) (cbound[i + 1] - cbound[i]));
	}


	/* locate next non-tonal component until finished; */
	/* add to list of non-tonal components			   */

	/* Masahiro Iwadare's fix for infinite looping problem? */
	if (power[centre].type == TONE) {
	  if (power[centre + 1].type == TONE) {
	centre++;
	  } else
	centre--;
	}

	if (last == LAST)
	  *noise = centre;
	else {
	  power[centre].next = LAST;
	  power[last].next = centre;
	}
	power[centre].x = sum;
	power[centre].type = NOISE;
	last = centre;
  }
}

/****************************************************************
*
*		 This function reduces the number of noise and tonal
* component for further threshold analysis.
*
****************************************************************/

static void psycho_1_subsampling (mask power[HAN_SIZE], g_thres * ltg, int *tone, int *noise)
{
  int i, old;

  i = *tone;
  old = STOP;			/* calculate tonal components for */

  while ((i != LAST) && (i != STOP))
  {				/* reduction of spectral lines	  */
	if (power[i].x < ltg[power[i].map].hear) {
	  power[i].type = FALSE;
	  power[i].x = DBMIN;
	  if (old == STOP)
	*tone = power[i].next;
	  else
	power[old].next = power[i].next;
	} else
	  old = i;
	i = power[i].next;
  }
  i = *noise;
  old = STOP;			/* calculate non-tonal components for */
  while ((i != LAST) && (i != STOP)) {	/* reduction of spectral lines		  */
	if (power[i].x < ltg[power[i].map].hear) {
	  power[i].type = FALSE;
	  power[i].x = DBMIN;
	  if (old == STOP)
	*noise = power[i].next;
	  else
	power[old].next = power[i].next;
	} else
	  old = i;
	i = power[i].next;
  }
  i = *tone;
  old = STOP;
  while ((i != LAST) && (i != STOP))
  {				/* if more than one */
	if (power[i].next == LAST)
	  break;			/* tonal component	*/
	if (ltg[power[power[i].next].map].bark -	/* is less than .5	*/
	ltg[power[i].map].bark < 0.5) { /* bark, take the	*/
	  if (power[power[i].next].x > power[i].x) {	/* maximum			*/
	if (old == STOP)
	  *tone = power[i].next;
	else
	  power[old].next = power[i].next;
	power[i].type = FALSE;
	power[i].x = DBMIN;
	i = power[i].next;
	  } else {
	power[power[i].next].type = FALSE;
	power[power[i].next].x = DBMIN;
	power[i].next = power[power[i].next].next;
	old = i;
	  }
	} else {
	  old = i;
	  i = power[i].next;
	}
  }
}

/****************************************************************
*
*		 This function calculates the individual threshold and
* sum with the quiet threshold to find the global threshold.
*
****************************************************************/

/* mainly just changed the way range checking was done MFC Nov 1999 */
static void psycho_1_threshold (psycho_1_mem *mem, int *tone, int *noise,
		int bit_rate)
{
  int sub_size = mem->sub_size;
  mask *power = mem->power;
  g_thres *ltg = mem->ltg;
  int k, t;
  FLOAT dz, tmps, vf;

  for (k = 1; k < sub_size; k++) {
	ltg[k].x = DBMIN;
	t = *tone;			/* calculate individual masking threshold for */
	while ((t != LAST) && (t != STOP))
	{				/* components in order to find the global	  */
	  dz = ltg[k].bark - ltg[power[t].map].bark;	/* distance of bark value */
	  if (dz >= -3.0 && dz < 8.0) {
	tmps = -1.525 - 0.275 * ltg[power[t].map].bark - 4.5 + power[t].x;
	/* masking function for lower & upper slopes */
	if (dz < -1)
	  vf = 17 * (dz + 1) - (0.4 * power[t].x + 6);
	else if (dz < 0)
	  vf = (0.4 * power[t].x + 6) * dz;
	else if (dz < 1)
	  vf = (-17 * dz);
	else
	  vf = -(dz - 1) * (17 - 0.15 * power[t].x) - 17;
	ltg[k].x = add_db (mem, ltg[k].x, tmps + vf);
	  }
	  t = power[t].next;
	}

	t = *noise;			/* calculate individual masking threshold  */
	while ((t != LAST) && (t != STOP)) {	/* for non-tonal components to find LTG	   */
	  dz = ltg[k].bark - ltg[power[t].map].bark;	/* distance of bark value */
	  if (dz >= -3.0 && dz < 8.0) {
	tmps = -1.525 - 0.175 * ltg[power[t].map].bark - 0.5 + power[t].x;
	/* masking function for lower & upper slopes */
	if (dz < -1)
	  vf = 17 * (dz + 1) - (0.4 * power[t].x + 6);
	else if (dz < 0)
	  vf = (0.4 * power[t].x + 6) * dz;
	else if (dz < 1)
	  vf = (-17 * dz);
	else
	  vf = -(dz - 1) * (17 - 0.15 * power[t].x) - 17;
	ltg[k].x = add_db (mem, ltg[k].x, tmps + vf);
	  }
	  t = power[t].next;
	}
	if (bit_rate < 96)
	  ltg[k].x = add_db (mem, ltg[k].hear, ltg[k].x);
	else
	  ltg[k].x = add_db (mem, ltg[k].hear - 12.0, ltg[k].x);
  }

}

/****************************************************************
*
*		 This function finds the minimum masking threshold and
* return the value to the encoder.
*
****************************************************************/

static void psycho_1_minimum_mask (int sub_size, g_thres * ltg, FLOAT ltmin[SBLIMIT], int sblimit)
{
  FLOAT min;
  int i, j;

  j = 1;
  for (i = 0; i < sblimit; i++)
	if (j >= sub_size - 1)	/* check subband limit, and		  */
	  ltmin[i] = ltg[sub_size - 1].hear;	/* calculate the minimum masking  */
	else {			/* level of LTMIN for each subband */
	  min = ltg[j].x;
	  while (ltg[j].line >> 4 == i && j < sub_size) {
	if (min > ltg[j].x)
	  min = ltg[j].x;
	j++;
	  }
	  ltmin[i] = min;
	}
}

/*****************************************************************
*
*		 This procedure is called in musicin to pick out the
* smaller of the scalefactor or threshold.
*
*****************************************************************/

static void psycho_1_smr (FLOAT ltmin[SBLIMIT], FLOAT spike[SBLIMIT], FLOAT scale[SBLIMIT],
	  int sblimit)
{
  int i;
  FLOAT max;

  for (i = 0; i < sblimit; i++) {	/* determine the signal	  */
	max = 20 * log10 (scale[i] * 32768) - 10;	/* level for each subband */
	if (spike[i] > max)
	  max = spike[i];		/* for the maximum scale  */
	max -= ltmin[i];		/* factors				  */
	ltmin[i] = max;
  }
}


/*
static void psycho_1_dump(mask power[HAN_SIZE], int *tone, int *noise) {
  int t;

  fprintf(stdout,"1 Ton: ");
  t=*tone;
  while (t!=LAST && t!=STOP) {
	fprintf(stdout,"[%i] %3.0f ",t, power[t].x);
	t = power[t].next;
  }
  fprintf(stdout,"\n");	 
  
  fprintf(stdout,"1 Nos: ");
  t=*noise;
  while (t!=LAST && t!=STOP) {
	fprintf(stdout,"[%i] %3.0f ",t, power[t].x);
	t = power[t].next;
  }
  fprintf(stdout,"\n");
}
*/


void psycho_1 (twolame_options *glopts, short buffer[2][1152], FLOAT scale[2][SBLIMIT],
		   FLOAT ltmin[2][SBLIMIT])
{
  psycho_1_mem *mem;
  frame_header *header = &glopts->header;
  int nch = glopts->num_channels_out;
  int sblimit = glopts->sblimit;
  int k, i, tone = 0, noise = 0;
  FLOAT sample[FFT_SIZE];
  FLOAT spike[2][SBLIMIT];
  FLOAT *fft_buf[2];
  FLOAT energy[FFT_SIZE];

  /* call functions for critical boundaries, freq. */
  if (!glopts->p1mem) {			/* bands, bark values, and mapping */
	mem = (psycho_1_mem *)TWOLAME_MALLOC(sizeof(psycho_1_mem));

	mem->power = (mask_ptr)TWOLAME_MALLOC(sizeof (mask) * HAN_SIZE);
	if (header->version == TWOLAME_MPEG1) {
	  mem->cbound = psycho_1_read_cbound (header->lay, header->samplerate_idx, &mem->crit_band);
	  psycho_1_read_freq_band (&mem->ltg, header->lay, header->samplerate_idx, &mem->sub_size);
	} else {
	  mem->cbound = psycho_1_read_cbound (header->lay, header->samplerate_idx + 4, &mem->crit_band);
	  psycho_1_read_freq_band (&mem->ltg, header->lay, header->samplerate_idx + 4, &mem->sub_size);
	}
	psycho_1_make_map (mem->sub_size, mem->power, mem->ltg);
	for (i = 0; i < 1408; i++)
	  mem->fft_buf[0][i] = mem->fft_buf[1][i] = 0;

	psycho_1_init_add_db (mem);		/* create the add_db table */

	mem->off[0]=256;
	mem->off[1]=256;

	glopts->p1mem = mem;
  }
  {
	mem = glopts->p1mem;

	fft_buf[0] = mem->fft_buf[0];
	fft_buf[1] = mem->fft_buf[1];
  }


  for (k = 0; k < nch; k++) {
	/* check pcm input for 3 blocks of 384 samples */
	/* sami's speedup, added in 02j
	   saves about 4% overall during an encode */
	int ok = mem->off[k] % 1408;
	for (i = 0; i < 1152; i++) {
	  fft_buf[k][ok++] = (FLOAT) buffer[k][i] / SCALE;
	  if (ok >= 1408)
	ok = 0;
	}
	ok = (mem->off[k] + 1216) % 1408;
	for (i = 0; i < FFT_SIZE; i++) {
	  sample[i] = fft_buf[k][ok++];
	  if (ok >= 1408)
	ok = 0;
	}
	mem->off[k] += 1152;
	mem->off[k] %= 1408;

	psycho_1_hann_fft_pickmax (sample, mem->power, &spike[k][0], energy);
	psycho_1_tonal_label (mem, &tone);
	psycho_1_noise_label (mem, &noise, energy);
	//psycho_1_dump(power, &tone, &noise) ;
	psycho_1_subsampling (mem->power, mem->ltg, &tone, &noise);
	psycho_1_threshold (mem, &tone, &noise, glopts->bitrate / nch);
	psycho_1_minimum_mask (mem->sub_size, mem->ltg, &ltmin[k][0], sblimit);
	psycho_1_smr (&ltmin[k][0], &spike[k][0], &scale[k][0], sblimit);
  }

}

void psycho_1_deinit(psycho_1_mem **mem) {

	if (mem==NULL||*mem==NULL) return;

	TWOLAME_FREE( (*mem)->cbound );
	TWOLAME_FREE( (*mem)->ltg );
	TWOLAME_FREE( (*mem)->power );
	TWOLAME_FREE( (*mem) );
}


// vim:ts=4:sw=4:nowrap: