/* libSoX effect: Spectrogram       (c) 2008-9 robs@users.sourceforge.net * * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA */ #ifdef NDEBUG /* Enable assert always. */#undef NDEBUG /* Must undef above assert.h or other that might include it. */#endif #include "sox_i.h"#include "fft4g.h"#include <assert.h>#include <math.h>#ifdef HAVE_LIBPNG_PNG_H#include <libpng/png.h>#else#include <png.h>#endif#include <zlib.h> #define MAX_FFT_SIZE 4096#define is_p2(x) !(x & (x - 1)) typedef enum {Window_Hann, Window_Hamming, Window_Bartlett, Window_Rectangular, Window_Kaiser} win_type_t;static lsx_enum_item const window_options[] = {  LSX_ENUM_ITEM(Window_,Hann)  LSX_ENUM_ITEM(Window_,Hamming)  LSX_ENUM_ITEM(Window_,Bartlett)  LSX_ENUM_ITEM(Window_,Rectangular)  LSX_ENUM_ITEM(Window_,Kaiser)  {0, 0}}; typedef struct {  /* Parameters */  double     pixels_per_sec, window_adjust;  int        x_size0, y_size, Y_size, dB_range, gain, spectrum_points, perm;  sox_bool   monochrome, light_background, high_colour, slack_overlap, no_axes;  sox_bool   raw, alt_palette, truncate;  win_type_t win_type;  char const * out_name, * title, * comment;  char const *duration_str, *start_time_str;  sox_bool   using_stdout; /* output image to stdout */   /* Shared work area */  double     * shared, * * shared_ptr;   /* Per-channel work area */  int        WORK;  /* Start of work area is marked by this dummy variable. */  uint64_t   skip;  int        dft_size, step_size, block_steps, block_num, rows, cols, read;  int        x_size, end, end_min, last_end;  sox_bool   truncated;  double     buf[MAX_FFT_SIZE], dft_buf[MAX_FFT_SIZE], window[MAX_FFT_SIZE];  double     block_norm, max, magnitudes[(MAX_FFT_SIZE>>1) + 1];  float      * dBfs;} priv_t; #define secs(cols) \  ((double)(cols) * p->step_size * p->block_steps / effp->in_signal.rate) static unsigned char const alt_palette[] =  "\0\0\0\0\0\3\0\1\5\0\1\10\0\1\12\0\1\13\0\1\16\1\2\20\1\2\22\1\2\25\1\2\26"  "\1\2\30\1\3\33\1\3\35\1\3\37\1\3\40\1\3\"\1\3$\1\3%\1\3'\1\3(\1\3*\1\3,\1"  "\3.\1\3/\1\3""0\1\3""2\1\3""4\2\3""6\4\3""8\5\3""9\7\3;\11\3=\13\3?\16\3"  "A\17\2B\21\2D\23\2F\25\2H\27\2J\30\2K\32\2M\35\2O\40\2Q$\2S(\2U+\2W0\2Z3"  "\2\\7\2_;\2a>\2cB\2eE\2hI\2jM\2lQ\2nU\2pZ\2r_\2tc\2uh\2vl\2xp\3zu\3|z\3}"  "~\3~\203\3\200\207\3\202\214\3\204\220\3\205\223\3\203\226\3\200\230\3~\233"  "\3|\236\3z\240\3x\243\3u\246\3s\251\3q\253\3o\256\3m\261\3j\263\3h\266\3"  "f\272\3b\274\3^\300\3Z\303\3V\307\3R\312\3N\315\3J\321\3F\324\3C\327\3>\333"  "\3:\336\3""6\342\3""2\344\3/\346\7-\350\15,\352\21+\354\27*\355\33)\356\40"  "(\360&'\362*&\364/$\3654#\3669#\370>!\372C\40\374I\40\374O\"\374V&\374]*"  "\374d,\374k0\374r3\374z7\375\201;\375\210>\375\217B\375\226E\375\236I\375"  "\245M\375\254P\375\261T\375\267X\375\274\\\375\301a\375\306e\375\313i\375"  "\320m\376\325q\376\332v\376\337z\376\344~\376\351\202\376\356\206\376\363"  "\213\375\365\217\374\366\223\373\367\230\372\367\234\371\370\241\370\371"  "\245\367\371\252\366\372\256\365\372\263\364\373\267\363\374\274\361\375"  "\300\360\375\305\360\376\311\357\376\314\357\376\317\360\376\321\360\376"  "\324\360\376\326\360\376\330\360\376\332\361\377\335\361\377\337\361\377"  "\341\361\377\344\361\377\346\362\377\350\362\377\353";#define alt_palette_len ((array_length(alt_palette) - 1) / 3) static int getopts(sox_effect_t * effp, int argc, char **argv){  priv_t * p = (priv_t *)effp->priv;  uint64_t dummy;  char const * next;  int c;  lsx_getopt_t optstate;  lsx_getopt_init(argc, argv, "+S:d:x:X:y:Y:z:Z:q:p:W:w:st:c:AarmlhTo:", NULL, lsx_getopt_flag_none, 1, &optstate);   p->dB_range = 120, p->spectrum_points = 249, p->perm = 1; /* Non-0 defaults */  p->out_name = "spectrogram.png", p->comment = "Created by SoX";   while ((c = lsx_getopt(&optstate)) != -1) switch (c) {    GETOPT_NUMERIC(optstate, 'x', x_size0       , 100, 5000)    GETOPT_NUMERIC(optstate, 'X', pixels_per_sec,  1 , 5000)    GETOPT_NUMERIC(optstate, 'y', y_size        , 64 , 1200)    GETOPT_NUMERIC(optstate, 'Y', Y_size        , 130, MAX_FFT_SIZE / 2 + 2)    GETOPT_NUMERIC(optstate, 'z', dB_range      , 20 , 180)    GETOPT_NUMERIC(optstate, 'Z', gain          ,-100, 100)    GETOPT_NUMERIC(optstate, 'q', spectrum_points, 0 , p->spectrum_points)    GETOPT_NUMERIC(optstate, 'p', perm          ,  1 , 6)    GETOPT_NUMERIC(optstate, 'W', window_adjust , -10, 10)    case 'w': p->win_type = lsx_enum_option(c, optstate.arg, window_options);   break;    case 's': p->slack_overlap    = sox_true;   break;    case 'A': p->alt_palette      = sox_true;   break;    case 'a': p->no_axes          = sox_true;   break;    case 'r': p->raw              = sox_true;   break;    case 'm': p->monochrome       = sox_true;   break;    case 'l': p->light_background = sox_true;   break;    case 'h': p->high_colour      = sox_true;   break;    case 'T': p->truncate         = sox_true;   break;    case 't': p->title            = optstate.arg; break;    case 'c': p->comment          = optstate.arg; break;    case 'o': p->out_name         = optstate.arg; break;    case 'S': next = lsx_parsesamples(1e5, optstate.arg, &dummy, 't');      if (next && !*next) {p->start_time_str = lsx_strdup(optstate.arg); break;}      return lsx_usage(effp);    case 'd': next = lsx_parsesamples(1e5, optstate.arg, &dummy, 't');      if (next && !*next) {p->duration_str = lsx_strdup(optstate.arg); break;}      return lsx_usage(effp);    default: lsx_fail("invalid option `-%c'", optstate.opt); return lsx_usage(effp);  }  if (!!p->x_size0 + !!p->pixels_per_sec + !!p->duration_str > 2) {    lsx_fail("only two of -x, -X, -d may be given");    return SOX_EOF;  }  if (p->y_size && p->Y_size) {    lsx_fail("only one of -y, -Y may be given");    return SOX_EOF;  }  p->gain = -p->gain;  --p->perm;  p->spectrum_points += 2;  if (p->alt_palette)    p->spectrum_points = min(p->spectrum_points, (int)alt_palette_len);  p->shared_ptr = &p->shared;  if (!strcmp(p->out_name, "-")) {    if (effp->global_info->global_info->stdout_in_use_by) {      lsx_fail("stdout already in use by `%s'", effp->global_info->global_info->stdout_in_use_by);      return SOX_EOF;    }    effp->global_info->global_info->stdout_in_use_by = effp->handler.name;    p->using_stdout = sox_true;  }  return optstate.ind !=argc || p->win_type == INT_MAX? lsx_usage(effp) : SOX_SUCCESS;} static double make_window(priv_t * p, int end){  double sum = 0, * w = end < 0? p->window : p->window + end;  int i, n = p->dft_size - abs(end);   if (end) memset(p->window, 0, sizeof(p->window));  for (i = 0; i < n; ++i) w[i] = 1;  switch (p->win_type) {    case Window_Hann: lsx_apply_hann(w, n); break;    case Window_Hamming: lsx_apply_hamming(w, n); break;    case Window_Bartlett: lsx_apply_bartlett(w, n); break;    case Window_Rectangular: break;    default: lsx_apply_kaiser(w, n, lsx_kaiser_beta(        (p->dB_range + p->gain) * (1.1 + p->window_adjust / 50), .1));  }  for (i = 0; i < p->dft_size; ++i) sum += p->window[i];  for (i = 0; i < p->dft_size; ++i) p->window[i] *= 2 / sum    * sqr((double)n / p->dft_size);    /* empirical small window adjustment */  return sum;} static double * rdft_init(int n){  double * q = lsx_malloc(2 * (n / 2 + 1) * n * sizeof(*q)), * p = q;  int i, j;  for (j = 0; j <= n / 2; ++j) for (i = 0; i < n; ++i)    *p++ = cos(2 * M_PI * j * i / n), *p++ = sin(2 * M_PI * j * i / n);  return q;} #define _ re += in[i] * *q++, im += in[i++] * *q++,static void rdft_p(double const * q, double const * in, double * out, int n){  int i, j;  for (j = 0; j <= n / 2; ++j) {    double re = 0, im = 0;    for (i = 0; i < (n & ~7);) _ _ _ _ _ _ _ _ 0;    while (i < n) _ 0;    *out++ += re * re + im * im;  }} static int start(sox_effect_t * effp){  priv_t * p = (priv_t *)effp->priv;  double actual, duration = 0.0, start_time = 0.0,         pixels_per_sec = p->pixels_per_sec;  uint64_t d;   memset(&p->WORK, 0, sizeof(*p) - field_offset(priv_t, WORK));   if (p->duration_str) {    lsx_parsesamples(effp->in_signal.rate, p->duration_str, &d, 't');    duration = d / effp->in_signal.rate;  }  if (p->start_time_str) {    lsx_parsesamples(effp->in_signal.rate, p->start_time_str, &d, 't');    start_time = d / effp->in_signal.rate;    p->skip = d;  }   p->x_size = p->x_size0;  while (sox_true) {    if (!pixels_per_sec && p->x_size && duration)      pixels_per_sec = min(5000, p->x_size / duration);    else if (!p->x_size && pixels_per_sec && duration)      p->x_size = min(5000, (int)(pixels_per_sec * duration + .5));    if (!duration && effp->in_signal.length != SOX_UNKNOWN_LEN) {      duration = effp->in_signal.length / (effp->in_signal.rate * effp->in_signal.channels);      duration -= start_time;      if (duration <= 0)        duration = 1;      continue;    } else if (!p->x_size) {      p->x_size = 800;      continue;    } else if (!pixels_per_sec) {      pixels_per_sec = 100;      continue;    }    break;  }   if (p->y_size) {    p->dft_size = 2 * (p->y_size - 1);    if (!is_p2(p->dft_size) && !effp->flow)      p->shared = rdft_init(p->dft_size);  } else {   int y = max(32, (p->Y_size? p->Y_size : 550) / effp->in_signal.channels - 2);   for (p->dft_size = 128; p->dft_size <= y; p->dft_size <<= 1);  }  if (is_p2(p->dft_size) && !effp->flow)    lsx_safe_rdft(p->dft_size, 1, p->dft_buf);  lsx_debug("duration=%g x_size=%i pixels_per_sec=%g dft_size=%i", duration, p->x_size, pixels_per_sec, p->dft_size);   p->end = p->dft_size;  p->rows = (p->dft_size >> 1) + 1;  actual = make_window(p, p->last_end = 0);  lsx_debug("window_density=%g", actual / p->dft_size);  p->step_size = (p->slack_overlap? sqrt(actual * p->dft_size) : actual) + .5;  p->block_steps = effp->in_signal.rate / pixels_per_sec;  p->step_size = p->block_steps / ceil((double)p->block_steps / p->step_size) +.5;  p->block_steps = floor((double)p->block_steps / p->step_size +.5);  p->block_norm = 1. / p->block_steps;  actual = effp->in_signal.rate / p->step_size / p->block_steps;  if (!effp->flow && actual != pixels_per_sec)    lsx_report("actual pixels/s = %g", actual);  lsx_debug("step_size=%i block_steps=%i", p->step_size, p->block_steps);  p->max = -p->dB_range;  p->read = (p->step_size - p->dft_size) / 2;  return SOX_SUCCESS;} static int do_column(sox_effect_t * effp){  priv_t * p = (priv_t *)effp->priv;  int i;   if (p->cols == p->x_size) {    p->truncated = sox_true;    if (!effp->flow)      lsx_report("PNG truncated at %g seconds", secs(p->cols));    return p->truncate? SOX_EOF : SOX_SUCCESS;  }  ++p->cols;  p->dBfs = lsx_realloc(p->dBfs, p->cols * p->rows * sizeof(*p->dBfs));    /* FIXME: allocate in larger steps (for several columns) */  for (i = 0; i < p->rows; ++i) {    double dBfs = 10 * log10(p->magnitudes[i] * p->block_norm);    p->dBfs[(p->cols - 1) * p->rows + i] = dBfs + p->gain;    p->max = max(dBfs, p->max);  }  memset(p->magnitudes, 0, p->rows * sizeof(*p->magnitudes));  p->block_num = 0;  return SOX_SUCCESS;} static int flow(sox_effect_t * effp,    const sox_sample_t * ibuf, sox_sample_t * obuf,    size_t * isamp, size_t * osamp){  priv_t * p = (priv_t *)effp->priv;  size_t len = *isamp = *osamp = min(*isamp, *osamp);  int i;   memcpy(obuf, ibuf, len * sizeof(*obuf)); /* Pass on audio unaffected */   if (p->skip) {    if (p->skip >= len) {      p->skip -= len;      return SOX_SUCCESS;    }    ibuf += p->skip;    len -= p->skip;    p->skip = 0;  }  while (!p->truncated) {    if (p->read == p->step_size) {      memmove(p->buf, p->buf + p->step_size,          (p->dft_size - p->step_size) * sizeof(*p->buf));      p->read = 0;    }    for (; len && p->read < p->step_size; --len, ++p->read, --p->end)      p->buf[p->dft_size - p->step_size + p->read] =        SOX_SAMPLE_TO_FLOAT_64BIT(*ibuf++,);    if (p->read != p->step_size)      break;     if ((p->end = max(p->end, p->end_min)) != p->last_end)      make_window(p, p->last_end = p->end);    for (i = 0; i < p->dft_size; ++i) p->dft_buf[i] = p->buf[i] * p->window[i];    if (is_p2(p->dft_size)) {      lsx_safe_rdft(p->dft_size, 1, p->dft_buf);      p->magnitudes[0] += sqr(p->dft_buf[0]);      for (i = 1; i < p->dft_size >> 1; ++i)        p->magnitudes[i] += sqr(p->dft_buf[2*i]) + sqr(p->dft_buf[2*i+1]);      p->magnitudes[p->dft_size >> 1] += sqr(p->dft_buf[1]);    }    else rdft_p(*p->shared_ptr, p->dft_buf, p->magnitudes, p->dft_size);    if (++p->block_num == p->block_steps && do_column(effp) == SOX_EOF)      return SOX_EOF;  }  return SOX_SUCCESS;} static int drain(sox_effect_t * effp, sox_sample_t * obuf_, size_t * osamp){  priv_t * p = (priv_t *)effp->priv;   if (!p->truncated) {    sox_sample_t * ibuf = lsx_calloc(p->dft_size, sizeof(*ibuf));    sox_sample_t * obuf = lsx_calloc(p->dft_size, sizeof(*obuf));    size_t isamp = (p->dft_size - p->step_size) / 2;    int left_over = (isamp + p->read) % p->step_size;     if (left_over >= p->step_size >> 1)      isamp += p->step_size - left_over;    lsx_debug("cols=%i left=%i end=%i", p->cols, p->read, p->end);    p->end = 0, p->end_min = -p->dft_size;    if (flow(effp, ibuf, obuf, &isamp, &isamp) == SOX_SUCCESS && p->block_num) {      p->block_norm *= (double)p->block_steps / p->block_num;      do_column(effp);    }    lsx_debug("flushed cols=%i left=%i end=%i", p->cols, p->read, p->end);    free(obuf);    free(ibuf);  }  (void)obuf_, *osamp = 0;  return SOX_SUCCESS;} enum {Background, Text, Labels, Grid, fixed_palette}; static unsigned colour(priv_t const * p, double x){  unsigned c = x < -p->dB_range? 0 : x >= 0? p->spectrum_points - 1 :      1 + (1 + x / p->dB_range) * (p->spectrum_points - 2);  return fixed_palette + c;} static void make_palette(priv_t const * p, png_color * palette){  int i;   if (p->light_background) {    memcpy(palette++, (p->monochrome)? "\337\337\337":"\335\330\320", (size_t)3);    memcpy(palette++, "\0\0\0"      , (size_t)3);    memcpy(palette++, "\077\077\077", (size_t)3);    memcpy(palette++, "\077\077\077", (size_t)3);  } else {    memcpy(palette++, "\0\0\0"      , (size_t)3);    memcpy(palette++, "\377\377\377", (size_t)3);    memcpy(palette++, "\277\277\277", (size_t)3);    memcpy(palette++, "\177\177\177", (size_t)3);  }  for (i = 0; i < p->spectrum_points; ++i) {    double c[3], x = (double)i / (p->spectrum_points - 1);    int at = p->light_background? p->spectrum_points - 1 - i : i;    if (p->monochrome) {      c[2] = c[1] = c[0] = x;      if (p->high_colour) {        c[(1 + p->perm) % 3] = x < .4? 0 : 5 / 3. * (x - .4);        if (p->perm < 3)          c[(2 + p->perm) % 3] = x < .4? 0 : 5 / 3. * (x - .4);      }      palette[at].red  = .5 + 255 * c[0];      palette[at].green= .5 + 255 * c[1];      palette[at].blue = .5 + 255 * c[2];      continue;    }    if (p->high_colour) {      static const int states[3][7] = {        {4,5,0,0,2,1,1}, {0,0,2,1,1,3,2}, {4,1,1,3,0,0,2}};      int j, phase_num = min(7 * x, 6);      for (j = 0; j < 3; ++j) switch (states[j][phase_num]) {        case 0: c[j] = 0; break;        case 1: c[j] = 1; break;        case 2: c[j] = sin((7 * x - phase_num) * M_PI / 2); break;        case 3: c[j] = cos((7 * x - phase_num) * M_PI / 2); break;        case 4: c[j] =      7 * x - phase_num;  break;        case 5: c[j] = 1 - (7 * x - phase_num); break;      }    } else if (p->alt_palette) {      int n = (double)i / (p->spectrum_points - 1) * (alt_palette_len - 1) + .5;      c[0] = alt_palette[3 * n + 0] / 255.;      c[1] = alt_palette[3 * n + 1] / 255.;      c[2] = alt_palette[3 * n + 2] / 255.;    } else {      if      (x < .13) c[0] = 0;      else if (x < .73) c[0] = 1  * sin((x - .13) / .60 * M_PI / 2);      else              c[0] = 1;      if      (x < .60) c[1] = 0;      else if (x < .91) c[1] = 1  * sin((x - .60) / .31 * M_PI / 2);      else              c[1] = 1;      if      (x < .60) c[2] = .5 * sin((x - .00) / .60 * M_PI);      else if (x < .78) c[2] = 0;      else              c[2] =          (x - .78) / .22;    }    palette[at].red  = .5 + 255 * c[p->perm % 3];    palette[at].green= .5 + 255 * c[(1 + p->perm + (p->perm % 2)) % 3];    palette[at].blue = .5 + 255 * c[(2 + p->perm - (p->perm % 2)) % 3];  }} static const Bytef fixed[] =  "x\332eT\241\266\2450\fDVV>Y\371$re%2\237\200|2\22YY\211D\"+\337'<y\345\312"  "\375\fd\345f\222\224\313\236\235{\270\344L\247a\232\4\246\351\201d\230\222"  "\304D\364^ \352\362S\"m\347\311\237\237\27\64K\243\2302\265\35\v\371<\363y"  "\354_\226g\354\214)e \2458\341\17\20J4\215[z<\271\277\367\0\63\64@\177\330c"  "\227\204 Ir.\5$U\200\260\224\326S\17\200=\\k\20QA\334%\342\20*\303P\234\211"  "\366\36#\370R\276_\316s-\345\222Dlz\363my*;\217\373\346z\267\343\236\364\246"  "\236\365\2419\305p\333\267\23(\207\265\333\233\325Y\342\243\265\357\262\215"  "\263t\271$\276\226ea\271.\367&\320\347\202_\234\27\377\345\222\253?\3422\364"  "\207y\256\236\229\331\33\f\376\227\266\"\356\253j\366\363\347\334US\34]\371?"  "\255\371\336\372z\265v\34\226\247\32\324\217\334\337\317U4\16\316{N\370\31"  "\365\357iL\231y\33y\264\211D7\337\4\244\261\220D\346\1\261\357\355>\3\342"  "\223\363\0\303\277\f[\214A,p\34`\255\355\364\37\372\224\342\277\f\207\255\36"  "_V\7\34\241^\316W\257\177\b\242\300\34\f\276\33?/9_\331f\346\36\25Y)\2301"  "\257\2414|\35\365\237\3424k\3\244\3\242\261\6\b\275>z$\370\215:\270\363w\36/"  "\265kF\v\20o6\242\301\364\336\27\325\257\321\364fs\231\215G\32=\257\305Di"  "\304^\177\304R\364Q=\225\373\33\320\375\375\372\200\337\37\374}\334\337\20"  "\364\310(]\304\267b\177\326Yrj\312\277\373\233\37\340";static unsigned char * font;#define font_x 5#define font_y 12#define font_X (font_x + 1) #define pixel(x,y) pixels[(y) * cols + (x)]#define print_at(x,y,c,t) print_at_(pixels,cols,x,y,c,t,0)#define print_up(x,y,c,t) print_at_(pixels,cols,x,y,c,t,1) static void print_at_(png_byte * pixels, int cols, int x, int y, int c, char const * text, int orientation){  for (;*text; ++text) {    int pos = ((*text < ' ' || *text > '~'? '~' + 1 : *text) - ' ') * font_y;    int i, j;    for (i = 0; i < font_y; ++i) {      unsigned line = font[pos++];      for (j = 0; j < font_x; ++j, line <<= 1)        if (line & 0x80) switch (orientation) {          case 0: pixel(x + j, y - i) = c; break;          case 1: pixel(x + i, y + j) = c; break;        }    }    switch (orientation) {      case 0: x += font_X; break;      case 1: y += font_X; break;    }  }} static int axis(double to, int max_steps, double * limit, char * * prefix){  double scale = 1, step = max(1, 10 * to);  int i, prefix_num = 0;  if (max_steps) {    double try, log_10 = HUGE_VAL, min_step = (to *= 10) / max_steps;    for (i = 5; i; i >>= 1) if ((try = ceil(log10(min_step * i))) <= log_10)      step = pow(10., log_10 = try) / i, log_10 -= i > 1;    prefix_num = floor(log_10 / 3);

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