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Copy pathsongs.c
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songs.c
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/**
* GJay, copyright (c) 2002-2004 Chuck Groom
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 1, or (at
* your option) any later version.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <endian.h>
#include <errno.h>
#include <math.h>
#include <ctype.h>
#include "gjay.h"
#include "gjay_audacious.h"
#include "analysis.h"
#include "mp3.h"
#include "vorbis.h"
#include "flac.h"
#include "ui.h"
#include "i18n.h"
typedef enum {
E_GJAY_DATA = 0,
E_FILE,
E_TITLE,
E_ARTIST,
E_ALBUM,
E_INODE,
E_DEV,
E_LENGTH,
E_RATING,
E_COLOR,
E_FREQ,
E_BPM,
/* Attributes */
E_PATH,
E_NOT_SONG,
E_REPEATS,
E_VOL_DIFF,
E_TYPE,
E_VERSION,
E_LAST
} element_type;
static const char * element_str[E_LAST] = {
"gjay_data",
"file",
"title",
"artist",
"album",
"inode",
"dev",
"length",
"rating",
"color",
"freq",
"bpm",
"path",
"not_song",
"repeats",
"volume_diff",
"type",
"version"
};
typedef struct {
gboolean is_repeat;
gboolean not_song;
gboolean use_hb;
gboolean new;
gboolean has_dev;
element_type element;
song * s;
} song_parse_state;
static gdouble song_mass ( song * s );
static void write_not_song_data ( FILE * f, gchar * path );
static gboolean read_song_file_type ( char * path,
song_file_type type,
gint * length,
gchar ** title,
gchar ** artist,
gchar ** album );
static gboolean read_data ( FILE * f );
static void data_start_element ( GMarkupParseContext *context,
const gchar *element_name,
const gchar **attribute_names,
const gchar **attribute_values,
gpointer user_data,
GError **error );
static void data_end_element ( GMarkupParseContext *context,
const gchar *element_name,
gpointer user_data,
GError **error );
static void data_text ( GMarkupParseContext *context,
const gchar *text,
gsize text_len,
gpointer user_data,
GError **error );
static int get_element ( gchar * element_name );
static void song_copy_attrs ( song * dest,
song * original );
/* Create a new song with the given filename */
song * create_song ( void ) {
song * s;
s = g_malloc(sizeof(song));
memset (s, 0x00, sizeof(song));
s->no_color = TRUE;
s->no_rating = TRUE;
s->no_data = TRUE;
s->access_ok = TRUE;
s->rating = (MIN_RATING + MAX_RATING)/2;
return s;
}
void delete_song (song * s) {
if(s->freq_pixbuf)
gdk_pixbuf_unref(s->freq_pixbuf);
if(s->color_pixbuf)
gdk_pixbuf_unref(s->color_pixbuf);
g_free(s->path);
g_free(s->title);
g_free(s->artist);
g_free(s->album);
g_free(s);
}
song * song_set_path ( song * s,
char * path ) {
int i;
free(s->path);
s->path = g_strdup(path);
s->fname = s->path;
for (i = strlen(s->path) - 1; i; i--) {
if (s->path[i] == '/') {
s->fname = s->path + i + 1;
return s;
}
}
return s;
}
/**
* If the song does not have a pixbuf for its frequency, and it has been
* analyzed, create a pixbuf for its frequency.
*/
void song_set_freq_pixbuf ( song * s) {
guchar * data;
int x, y, offset, rowstride;
guchar r, g, b;
assert(s);
if (s->freq_pixbuf)
return;
if (s->no_data)
return;
s->freq_pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB,
FALSE,
8,
FREQ_IMAGE_WIDTH,
FREQ_IMAGE_HEIGHT);
rowstride = gdk_pixbuf_get_rowstride(s->freq_pixbuf);
data = gdk_pixbuf_get_pixels (s->freq_pixbuf);
for (x = 0; x < NUM_FREQ_SAMPLES; x++) {
g = b = MIN(255, 255.0 * 1.8 * (float) sqrt((double) s->freq[x]));
r = MIN(255, 255.0 * 2.0 * s->freq[x]);
for (y = 0; y < FREQ_IMAGE_HEIGHT; y++) {
offset = rowstride * y + 3*x;
data[offset] = r;
data[offset + 1] = g;
data[offset + 2] = b;
}
}
}
/**
* If the song does not have a pixbuf for its frequency, and it has been
* analyzed, create a pixbuf for its frequency.
*/
void song_set_color_pixbuf ( song * s) {
guchar * data;
int x, y, offset, rowstride;
guchar r, g, b;
RGB rgb;
assert(s);
if (s->color_pixbuf)
return;
if (s->no_color)
return;
s->color_pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB,
FALSE,
8,
COLOR_IMAGE_WIDTH,
COLOR_IMAGE_HEIGHT);
rowstride = gdk_pixbuf_get_rowstride(s->color_pixbuf);
data = gdk_pixbuf_get_pixels (s->color_pixbuf);
rgb = hsv_to_rgb(s->color);
r = rgb.R * 255;
g = rgb.G * 255;
b = rgb.B * 255;
for (x = 0; x < COLOR_IMAGE_WIDTH; x++) {
for (y = 0; y < COLOR_IMAGE_HEIGHT; y++) {
offset = rowstride * y + 3*x;
data[offset] = r;
data[offset + 1] = g;
data[offset + 2] = b;
}
}
}
/**
* The song "s" repeats the song "original". It should copy the same info,
* but be marked as a copy.
*/
void song_set_repeats ( song * s, song * original ) {
char * path, * fname;
song * ll;
path = s->path;
fname = s->fname;
g_free(s->artist);
g_free(s->title);
g_free(s->album);
memcpy(s, original, sizeof(song));
if (original->title)
s->title = g_strdup(original->title);
if (original->album)
s->album = g_strdup(original->album);
if (original->artist)
s->artist = g_strdup(original->artist);
s->path = path;
s->fname = fname;
s->repeat_prev = NULL;
s->repeat_next = NULL;
s->freq_pixbuf = NULL;
s->color_pixbuf = NULL;
for (ll = original; ll->repeat_next; ll = ll->repeat_next)
;
ll->repeat_next = s;
s->repeat_prev = ll;
}
/**
* Copy the song's attributes to all other songs which repeat it.
*/
void song_set_repeat_attrs( song * s) {
song * repeat;
for (repeat = s->repeat_prev; repeat; repeat = repeat->repeat_prev)
song_copy_attrs(repeat, s);
for (repeat = s->repeat_next; repeat; repeat = repeat->repeat_next)
song_copy_attrs(repeat, s);
}
static void song_copy_attrs( song * dest, song * original ) {
dest->bpm = original->bpm;
dest->rating = original->rating;
dest->color = original->color;
memcpy(&dest->freq, &original->freq, sizeof(gdouble) * NUM_FREQ_SAMPLES);
dest->no_data = original->no_data;
dest->no_rating = original->no_rating;
dest->no_color = original->no_color;
dest->bpm_undef = original->bpm_undef;
dest->volume_diff = original->volume_diff;
dest->marked = original->marked;
}
/**
* Collect information about a path.
* IN: Path
* RETURN: Set all other attributes if it is a song, otherwise set is_song
* to false
*
* Note that we expect the path to be UTF8
*/
void file_info ( gchar * path,
gboolean * is_song,
guint32 * inode,
guint32 * dev,
gint * length,
gchar ** title,
gchar ** artist,
gchar ** album,
song_file_type * type ) {
gchar * latin1_path;
struct stat buf;
*is_song = FALSE;
*inode = 0;
*dev = 0;
*length = 0;
*artist = NULL;
*title = NULL;
*album = NULL;
if (verbosity > 1) {
printf(_("Scanning '%s'...\n"), path);
}
latin1_path = strdup_to_latin1(path);
if (stat(latin1_path, &buf)) {
g_free(latin1_path);
return;
}
*dev = buf.st_dev;
*inode = buf.st_ino;
#ifdef HAVE_VORBIS_VORBISFILE_H
if (gjay->ogg_supported && read_ogg_file_type(latin1_path, length, title, artist, album) == TRUE)
{
*is_song = TRUE;
*type = OGG;
g_free(latin1_path);
return;
}
#endif /* HAVE_VORBIS_VORBISFILE_H */
if (read_mp3_file_type(latin1_path, length, title, artist, album) == TRUE)
{
*is_song = TRUE;
*type = MP3;
g_free(latin1_path);
return;
}
*type = WAV;
if (read_song_file_type(latin1_path, *type,
length, title, artist, album)) {
*is_song = TRUE;
g_free(latin1_path);
return;
}
#ifdef HAVE_FLAC_METADATA_H
if (gjay->flac_supported && read_flac_file_type(latin1_path, length, title, artist, album) == TRUE)
{
*is_song = TRUE;
*type = FLAC;
g_free(latin1_path);
return;
}
#endif /* HAVE_FLAC_METADATA_H */
g_free(latin1_path);
}
void write_data_file(void) {
gchar *tmp_filename, *data_filename;
FILE * f;
GList * llist, * w_songs = NULL;
song * s;
tmp_filename = g_strdup_printf("%s/%s/%s_temp",
g_get_home_dir(), GJAY_DIR, GJAY_FILE_DATA);
data_filename = g_strdup_printf("%s/%s/%s",
g_get_home_dir(), GJAY_DIR, GJAY_FILE_DATA);
/* Cull songs which are no longer there */
for (llist = g_list_first(gjay->songs); llist; llist = g_list_next(llist)) {
s = SONG(llist);
if (!s->access_ok) {
if (s->repeat_prev)
s->repeat_prev->repeat_next = s->repeat_next;
if (s->repeat_next)
s->repeat_next->repeat_prev = s->repeat_prev;
} else {
w_songs = g_list_append(w_songs, s);
}
}
if ( (f = fopen(tmp_filename, "w")) == NULL) {
g_error(_("Unable to write song data %s\n"), tmp_filename);
} else {
fprintf(f, "<gjay_data version=\"%s\">\n", VERSION);
for (llist = g_list_first(w_songs); llist; llist = g_list_next(llist))
write_song_data(f, SONG(llist));
for (llist = g_list_first(gjay->not_songs);
llist; llist = g_list_next(llist))
write_not_song_data(f, (char *) llist->data);
fprintf(f, "</gjay_data>\n");
fclose(f);
rename(tmp_filename, data_filename);
gjay->songs_dirty = FALSE;
}
g_list_free(w_songs);
g_free(tmp_filename);
g_free(data_filename);
}
/**
* Append song info to the daemon data file.
*
* Return the file seek position of the start of the song/file, or -1 if
* error
*/
int append_daemon_file (song * s) {
char buffer[BUFFER_SIZE];
FILE * f;
int file_seek; /* Get the seek position before the write */
snprintf(buffer, BUFFER_SIZE, "%s/%s/%s", getenv("HOME"),
GJAY_DIR, GJAY_DAEMON_DATA);
f = fopen(buffer, "a");
if (f) {
file_seek = ftell(f);
write_song_data(f, s);
fclose(f);
return file_seek;
} else {
g_warning(_("Unable to write '%s'.\nAnalysis for '%s' was skipped!\n"),
buffer, s->path);
}
return -1;
}
/**
* Write a song to the data file in XML. Note that strings are UTF8-encoded.
*
* <file path="path" not_song="t/f" repeats="original_path">
* <title>str</title>
* <artist>str</artist>
* <album>str</album>
* <inode>int</inode>
* <dev>int</dev>
* <length>int</length>
* <rating>float</rating>
* <color type="hsv">float float float</color>
* <freq volume_diff="float">float float...</freq>
* <bpm>float</bpm>
* </file>
*/
void write_song_data (FILE * f, song * s) {
gchar * escape; /* Escape XML elements from text */
int k;
assert(s);
escape = g_markup_escape_text(s->path, strlen(s->path));
fprintf(f, "<file path=\"%s\"", escape);
g_free(escape);
if (s->repeat_prev) {
escape = g_markup_escape_text(s->repeat_prev->path,
strlen(s->repeat_prev->path));
fprintf(f, " repeats=\"%s\"", escape);
g_free(escape);
}
fprintf(f, ">\n");
if (!s->repeat_prev) {
if(s->artist) {
escape = g_markup_escape_text(s->artist, strlen(s->artist));
fprintf(f, "\t<artist>%s</artist>\n", escape);
g_free(escape);
}
if(s->album) {
escape = g_markup_escape_text(s->album, strlen(s->album));
fprintf(f, "\t<album>%s</album>\n", escape);
g_free(escape);
}
if(s->title) {
escape = g_markup_escape_text(s->title, strlen(s->title));
fprintf(f, "\t<title>%s</title>\n", escape);
g_free(escape);
}
fprintf(f, "\t<inode>%lu</inode>\n", (long unsigned int) s->inode);
fprintf(f, "\t<dev>%lu</dev>\n", (long unsigned int) s->dev);
fprintf(f, "\t<length>%d</length>\n", s->length);
if(!s->no_data) {
if (s->bpm_undef)
fprintf(f, "\t<bpm>undef</bpm>\n");
else
fprintf(f, "\t<bpm>%f</bpm>\n", s->bpm);
fprintf(f, "\t<freq volume_diff=\"%f\">", s->volume_diff);
for (k = 0; k < NUM_FREQ_SAMPLES; k++)
fprintf(f, "%f ", s->freq[k]);
fprintf(f, "</freq>\n");
}
if (!s->no_rating)
fprintf(f, "\t<rating>%f</rating>\n", s->rating);
if (!s->no_color)
fprintf(f, "\t<color type=\"hsv\">%f %f %f</color>\n",
s->color.H,
s->color.S,
s->color.V);
}
fprintf(f, "</file>\n");
}
static void write_not_song_data (FILE * f, gchar * path) {
gchar * escape; /* Escape XML elements from text */
assert(path);
escape = g_markup_escape_text(path, strlen(path));
fprintf(f, "<file path=\"%s\" not_song=\"t\"></file>\n", escape);
g_free(escape);
}
/**
* Read the main GJay data file and, if present, the daemon's analysis
* data.
*/
#define NUM_DATA_FILES 2
void read_data_file ( void ) {
char buffer[BUFFER_SIZE];
char * files[NUM_DATA_FILES] = { GJAY_FILE_DATA, GJAY_DAEMON_DATA };
FILE * f;
gint k;
for (k = 0; k < NUM_DATA_FILES; k++) {
snprintf(buffer, BUFFER_SIZE, "%s/%s/%s",
getenv("HOME"), GJAY_DIR, files[k]);
if (verbosity) {
printf(_("Reading from data file '%s'\n"), buffer);
}
f = fopen(buffer, "r");
if (f) {
read_data(f);
fclose(f);
}
}
}
/**
* Read a song/file info from the file at the seek position, add to the
* songs list. Return TRUE if the songs list was updated.
*/
gboolean add_from_daemon_file_at_seek (int seek) {
char buffer[BUFFER_SIZE];
gboolean result;
FILE * f;
result = FALSE;
snprintf(buffer, BUFFER_SIZE, "%s/%s/%s",
getenv("HOME"), GJAY_DIR, GJAY_DAEMON_DATA);
f = fopen(buffer, "r");
if (f) {
fseek(f, seek, SEEK_SET);
result = read_data(f);
if (result) {
gjay->songs_dirty = TRUE;
}
fclose(f);
}
return result;
}
/**
* Read file data from the file f to its end
*/
gboolean read_data (FILE * f ) {
GMarkupParseContext * parse_context;
GMarkupParser parser;
gboolean result = TRUE;
GError * error;
char buffer[BUFFER_SIZE];
gssize text_len;
song_parse_state state;
memset(&state, 0x00, sizeof(song_parse_state));
parser.start_element = data_start_element;
parser.end_element = data_end_element;
parser.text = data_text;
parse_context = g_markup_parse_context_new(&parser, 0, &state, NULL);
if (parse_context) {
while (result && !feof(f)) {
text_len = fread(buffer, 1, BUFFER_SIZE, f);
result = g_markup_parse_context_parse ( parse_context,
buffer,
text_len,
&error);
error = NULL;
}
g_markup_parse_context_free(parse_context);
}
return result;
}
/* Called for open tags <foo bar="baz"> */
void data_start_element (GMarkupParseContext *context,
const gchar *element_name,
const gchar **attribute_names,
const gchar **attribute_values,
gpointer user_data,
GError **error) {
song_parse_state * state = (song_parse_state *) user_data;
gchar * path = NULL, * repeat_path = NULL;
song * original;
element_type element;
int k;
element = get_element((char *) element_name);
switch(element) {
case E_FILE:
memset(state, 0x00, sizeof(song_parse_state));
for (k = 0; attribute_names[k]; k++) {
switch(get_element((char *) attribute_names[k])) {
case E_PATH:
path = (gchar *) attribute_values[k];
break;
case E_REPEATS:
repeat_path = (gchar *) attribute_values[k];
break;
case E_NOT_SONG:
if (*attribute_values[k] == 't')
state->not_song = TRUE;
break;
}
}
assert(path);
if (state->not_song) {
if (!g_hash_table_lookup(gjay->not_song_hash, path)) {
state->new = TRUE;
/* Only keep track of files which still exist */
if (!access(path, R_OK)) {
path = g_strdup(path);
gjay->not_songs = g_list_append(gjay->not_songs, path);
g_hash_table_insert ( gjay->not_song_hash,
path,
(gpointer) TRUE);
}
}
return;
}
state->s = g_hash_table_lookup(gjay->song_name_hash, path);
if (!state->s) {
state->new = TRUE;
state->s = create_song();
song_set_path(state->s, path);
}
if (repeat_path && (strlen(repeat_path) > 0)) {
state->is_repeat = TRUE;
original = g_hash_table_lookup(gjay->song_name_hash, repeat_path);
assert(original);
song_set_repeats(state->s, original);
}
state->s->marked = TRUE; /* Mark all modified or added songs */
break;
case E_RATING:
state->s->no_rating = FALSE;
break;
case E_COLOR:
state->use_hb = TRUE;
for (k = 0; attribute_names[k]; k++) {
switch(get_element((char *) attribute_names[k])) {
case E_TYPE:
if (strcasecmp(attribute_values[k], "hsv") == 0) {
state->use_hb = FALSE;
}
break;
}
}
state->s->no_color = FALSE;
break;
case E_FREQ:
for (k = 0; attribute_names[k]; k++) {
if (get_element((gchar *) attribute_names[k]) == E_VOL_DIFF) {
state->s->volume_diff = strtof_gjay(attribute_values[0], NULL);
}
}
/* Fall into next case */
case E_BPM:
state->s->no_data = FALSE;
break;
default:
break;
}
state->element = element;
}
/* Called for close tags </foo> */
void data_end_element (GMarkupParseContext *context,
const gchar *element_name,
gpointer user_data,
GError **error) {
gchar * latin1_path;
song_parse_state * state = (song_parse_state *) user_data;
if (get_element((char *) element_name) == E_FILE) {
if (state->new && state->s) {
/* Check to see if the song is still there */
latin1_path = strdup_to_latin1(state->s->path);
state->s->access_ok = !access(latin1_path, R_OK);
if (!state->s->access_ok) {
gjay->songs_dirty = TRUE;
}
g_free(latin1_path);
/* Add song to song list and hash table */
gjay->songs = g_list_append(gjay->songs, state->s);
g_hash_table_insert (gjay->song_name_hash,
state->s->path,
state->s);
hash_inode_dev(state->s, state->has_dev);
g_hash_table_insert (gjay->song_inode_dev_hash,
&state->s->inode_dev_hash,
state->s);
}
/* If there is a song and it itself is not copy of another
* song, check to see if it is the original upon which copies
* are based and set their attributes */
if (!(state->not_song || state->is_repeat))
song_set_repeat_attrs(state->s);
}
state->element = E_LAST;
}
void data_text ( GMarkupParseContext *context,
const gchar *text,
gsize text_len,
gpointer user_data,
GError **error) {
song_parse_state * state = (song_parse_state *) user_data;
gchar buffer[BUFFER_SIZE];
gchar * buffer_str;
int n;
memset(buffer, 0x00, BUFFER_SIZE);
memcpy(buffer, text, text_len);
switch(state->element) {
case E_TITLE:
if (state->new) {
g_free(state->s->title);
state->s->title = g_strdup(buffer);
}
break;
case E_ARTIST:
if (state->new) {
g_free(state->s->artist);
state->s->artist = g_strdup(buffer);
}
break;
case E_ALBUM:
if (state->new) {
g_free(state->s->album);
state->s->album = g_strdup(buffer);
}
break;
case E_INODE:
state->s->inode = atol(buffer);
break;
case E_DEV:
state->s->dev = atol(buffer);
state->has_dev = TRUE;
break;
case E_LENGTH:
state->s->length = atoi(buffer);
break;
case E_RATING:
state->s->rating = strtof_gjay(buffer, NULL);
break;
case E_BPM:
if (strcmp(buffer, "undef") == 0) {
state->s->bpm_undef = TRUE;
} else {
state->s->bpm = strtof_gjay(buffer, NULL);
}
break;
case E_COLOR:
if (state->use_hb) {
HB hb;
hb.H = strtof_gjay(buffer, &buffer_str);
hb.B = strtof_gjay(buffer_str, NULL);
state->s->color = hb_to_hsv(hb);
} else {
state->s->color.H = strtof_gjay(buffer, &buffer_str);
state->s->color.S = strtof_gjay(buffer_str, &buffer_str);
state->s->color.V = strtof_gjay(buffer_str, NULL);
}
break;
case E_FREQ:
buffer_str = buffer;
for (n = 0; n < NUM_FREQ_SAMPLES; n++) {
state->s->freq[n] = strtof_gjay(buffer_str, &buffer_str);
}
break;
default:
break;
}
}
static gboolean read_song_file_type ( char * path,
song_file_type type,
gint * length,
gchar ** title,
gchar ** artist,
gchar ** album) {
FILE * f;
int result;
struct stat buf;
waveheaderstruct header;
mp3info mp3;
assert(artist && album && title);
*artist = NULL;
*album = NULL;
*title = NULL;
switch (type) {
case MP3:
bzero(&mp3, sizeof(mp3info));
mp3.filename = path;
mp3.file = fopen(path, "r");
if (!mp3.file) {
g_warning(_("Unable to read song data '%s' : %s\n"),
path, strerror(errno));
return FALSE;
}
// returns 0 on success
result = get_mp3_info(&mp3, SCAN_QUICK, 1);
if (result == 0) {
*length = mp3.seconds;
if (mp3.id3_isvalid) {
*artist = strdup_to_utf8(mp3.id3.artist);
*album = strdup_to_utf8(mp3.id3.album);
*title = strdup_to_utf8(mp3.id3.title);
} else {
/* Use alternate methods of looking for ID3 tags
* This is needed to support, among other things,
* mp3s generated by iTunes */
get_id3_tags(mp3.file, title, artist, album);
}
}
fclose(mp3.file);
if (mp3.header_isvalid)
return TRUE;
else
return FALSE;
break;
case WAV:
f = fopen(path, "r");
if (!f)
return FALSE;
fread(&header, sizeof(waveheaderstruct), 1, f);
wav_header_swab(&header);
fclose(f);
if ((memcmp(header.chunk_type, "WAVE", 4) == 0) &&
(header.byte_p_spl / header.modus == 2)) {
stat(path, &buf);
*length = (buf.st_size - sizeof(waveheaderstruct)) / 176758;
return TRUE;
}
break;
default:
break;
}
return FALSE;
}
static int get_element ( gchar * element_name ) {
int k;
for (k = 0; k < E_LAST; k++) {
if (strcasecmp(element_str[k], element_name) == 0)
return k;
}
return k;
}
int write_dirty_song_timeout ( gpointer data ) {
if (gjay->songs_dirty)
write_data_file();
return TRUE;
}
gdouble song_force ( song * a, song * b ) {
gdouble ma, mb, attr, sign = 1;
ma = song_mass(a);
mb = song_mass(b);
attr = song_attraction(a, b) * 10;
if (attr < 0)
sign = -1;
return (ma * mb * attr * attr * sign);
}
/* Attraction is a value -1...1 for the affinity between A and B,
with criteria weighed by prefs */
gdouble song_attraction (song * a, song * b ) {
gdouble a_hue, a_saturation, a_brightness, a_freq, a_bpm, a_path;
gdouble d, ba, bb, v_diff, a_max, attraction = 0;
gint i;
GjayPrefs *prefs = gjay->prefs;
a_max =
(prefs->hue +
prefs->brightness +
prefs->saturation +
prefs->freq +
prefs->bpm +
prefs->path_weight);
a_hue = prefs->hue / a_max;
a_brightness = prefs->brightness / a_max;
a_saturation = prefs->saturation / a_max;
a_freq = prefs->freq / a_max;
a_bpm = prefs->bpm / a_max;
a_path = prefs->path_weight / a_max;
if (!(a->no_color || b->no_color)) {
/* Hue is 0...6 */
d = fabsl(a->color.H - b->color.H) / 6.0;
if (d > 0.5) {
d = 1 - d;
}
/* d is 0...1, where 0 is more similiar */
d = 1.0 - d*2.0;
/* d is now -1...1, where 1 is more similiar */
attraction += d * a_hue;
d = 1.0 - fabsl(a->color.S - b->color.S) * 2.0;
/* d is -1 ... 1, where 1 is more similiar*/
attraction += d * a_saturation;
d = 1.0 - fabsl(a->color.V - b->color.V) * 2.0;
/* d is -1 ... 1, where 1 is more similiar*/
attraction += d * a_brightness;
}
if (!(a->bpm_undef || b->bpm_undef)) {
ba = MIN(MAX(MIN_BPM, a->bpm), MAX_BPM) - MIN_BPM;
bb = MIN(MAX(MIN_BPM, b->bpm), MAX_BPM) - MIN_BPM;
d = fabsl(ba - bb) / ((gdouble) (MAX_BPM - MIN_BPM));
/* d is 0...1, 0 is most similar */
d = 1.0 - d * 2.0;
/* d is -1 ... 1 */
attraction += d * a_bpm;
}
if (!(a->no_data || b->no_data)) {
for (d = 0, i = 0; i < NUM_FREQ_SAMPLES; i++) {
d += fabsl(a->freq[i] - b->freq[i]);
if (i < NUM_FREQ_SAMPLES - 1) {
d += fabsl(a->freq[i] - b->freq[i + 1]) / 2.0;
d += fabsl(a->freq[i + 1] - b->freq[i]) / 2.0;
}
if (i > 0) {
d += fabsl(a->freq[i] - b->freq[i - 1]) / 2.0;
d += fabsl(a->freq[i - 1] - b->freq[i]) / 2.0;
}
}
/* d is 0...~20.0. Most similar is 0, medium similar are about 2 */
d = 1.0 - (d / 2.5);