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analysis.c
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analysis.c
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/*
* Gjay - Gtk+ DJ music playlist creator
* Copyright (C) 2010-2012 Craig Small
* Copyright (C) 2002 Chuck Groom.
*
* Sections of this code come from spectromatic, copyright (C)
* 1997-2002 Daniel Franklin, and BpmDJ by Werner Van Belle.
*
* 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 2, 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
* with this program; if not, see <http://www.gnu.org/licenses/>.
*
* Analysis.c -- manages the background threads and processes involved
* in song analysis.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdint.h>
#include <stdio.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/resource.h>
#include <errno.h>
#include <string.h>
#include <sys/poll.h>
#include <endian.h>
#include <math.h>
#include <time.h>
#include <assert.h>
#include <math.h>
#include <gsl/gsl_errno.h>
#include <gsl/gsl_fft_real.h>
#include <gsl/gsl_fft_halfcomplex.h>
#include "gjay.h"
#include "analysis.h"
#include "ipc.h"
#include "i18n.h"
#define BPM_BUF_SIZE 32*1024
#define SHARED_BUF_SIZE sizeof(short int) * BPM_BUF_SIZE
#define SLEEP_WHILE_IDLE 500
#define BROKEN_VAL 100000000000000.0
/* Multiplier for the frequency magnitude. 2.0 is close to the orginal value
* 5.0 gives a brighter display
*/
#define MAGS_MULTIPLIER 2.0
typedef struct {
FILE * f;
waveheaderstruct header;
long int freq_seek, seek;
char buffer[SHARED_BUF_SIZE];
} wav_file;
/* Sturcture to ferry data around */
struct daemon_data {
guint verbosity;
gboolean ogg_supported;
gboolean flac_supported;
gjay_mode mode;
GjayIPC *ipc;
GMainLoop * loop;
time_t last_ping;
gboolean in_analysis;
GjaySong *analyze_song;
gchar * mp3_decoder;
gchar * ogg_decoder;
gchar * flac_decoder;
};
#define AUDIO_RATE 2756UL /* Author states that 11025 is perfect
measure, but we can tolerate more
lossiness for the sake of speed */
#define START_BPM 120UL
#define STOP_BPM 160UL
/* Spectrum globals */
#define MAX_FREQ 22500
#define START_FREQ 100
#define WINDOW_SIZE 1024
#define STEP_SIZE 1024
static char * read_buffer;
static int read_buffer_size;
static long read_buffer_start;
static long read_buffer_end; /* same as file position */
static GList * queue = NULL;
static GHashTable * queue_hash = NULL;
static FILE * inflate_to_wav (struct daemon_data *ddata,
const gchar * path,
const song_file_type type);
static int run_analysis ( struct daemon_data *ddata,
wav_file * wsfile,
gdouble * freq_results,
gdouble * volume_diff,
gdouble * bpm_result );
static unsigned long bpm_phasefit ( const long i,
const unsigned char const *audio,
const unsigned long audiosize);
static int freq_read_frames ( wav_file * wsfile,
int start,
int length,
void *data );
static void send_ui_percent ( const int fd, int percent );
static void send_analyze_song_name ( const int fd, GjaySong *song; );
static void write_queue ( void );
static void kill_signal (int sig);
static void analysis_daemon(struct daemon_data *data);
gboolean daemon_idle ( gpointer data );
static void analyze( struct daemon_data *data, const char * fname, const gboolean result_to_stdout);
static struct daemon_data *create_daemon_data(GjayApp *gjay);
gboolean ui_pipe_input (GIOChannel *source,
GIOCondition condition,
gpointer data);
void
run_as_analyze_detached (GjayApp *gjay, const char * analyze_detached_fname)
{
struct daemon_data *data;
if (access(analyze_detached_fname, R_OK) != 0)
{
fprintf(stderr, _("Song file %s not found\n"), analyze_detached_fname);
exit(1);
}
if ( (data = create_daemon_data(gjay))==NULL)
exit(1);
data->mode = ANALYZE_DETACHED;
analyze(data, analyze_detached_fname, TRUE);
destroy_gjay_ipc(data->ipc);
}
void run_as_daemon(GjayApp *gjay, gjay_mode mode)
{
gchar *path;
FILE *fp;
struct daemon_data *data;
/* Write pid to ~/.gjay/gjay.pid */
path = g_strdup_printf("%s/%s/%s", g_get_home_dir(),
GJAY_DIR, GJAY_PID);
if ((fp = fopen(path, "w")) == NULL) {
g_error(_("Cannot open %s for writing\n"), path);
exit(1);
}
g_free(path);
fprintf(fp, "%d", getpid());
fclose(fp);
signal(SIGTERM, kill_signal);
signal(SIGKILL, kill_signal);
signal(SIGINT, kill_signal);
if ( (data = create_daemon_data(gjay))==NULL)
exit(1);
data->mode = mode;
analysis_daemon(data);
destroy_gjay_ipc(data->ipc);
}
/**
* When the daemon receives a kill signal, delete ~/.gjay/gjay.pid
*/
static void kill_signal (int sig) {
gchar *path;
/* Write pid to ~/.gjay/gjay.pid */
path = g_strdup_printf("%s/%s/%s", g_get_home_dir(),
GJAY_DIR, GJAY_PID);
unlink(path);
g_free(path);
exit(0);
}
static void add_file_to_queue ( char * fname, const int verbosity) {
char queue_fname[BUFFER_SIZE], buffer[BUFFER_SIZE], * str;
FILE * f_queue, * f_add;
if (verbosity > 1) {
printf(_("Adding '%s' to analysis queue\n"), fname);
}
snprintf(queue_fname, BUFFER_SIZE, "%s/%s/%s", getenv("HOME"),
GJAY_DIR, GJAY_QUEUE);
f_queue = fopen(queue_fname, "a");
f_add = fopen(fname, "r");
if (f_queue && f_add) {
while (!feof(f_add)) {
read_line(f_add, buffer, BUFFER_SIZE);
if (!g_hash_table_lookup(queue_hash, buffer)) {
str = g_strdup(buffer);
queue = g_list_append(queue, str);
g_hash_table_insert(queue_hash, str, (void *) 1);
fprintf(f_queue, "%s\n", str);
}
}
fclose(f_queue);
fclose(f_add);
}
}
static void write_queue (void) {
char fname[BUFFER_SIZE], fname_temp[BUFFER_SIZE];
FILE * f;
GList * llist;
snprintf(fname, BUFFER_SIZE, "%s/%s/%s", getenv("HOME"),
GJAY_DIR, GJAY_QUEUE);
snprintf(fname_temp, BUFFER_SIZE, "%s_temp", fname);
if (queue) {
f = fopen(fname_temp, "w");
if (f) {
for (llist = g_list_first(queue);
llist;
llist = g_list_next(llist)) {
fprintf(f, "%s\n", (char *) llist->data);
}
rename(fname_temp, fname);
fclose(f);
}
} else {
unlink(fname);
}
}
gboolean ui_pipe_input (GIOChannel *source,
GIOCondition condition,
gpointer user_data) {
GList * list;
char buffer[BUFFER_SIZE], * file;
int len, k, l;
ipc_type ipc;
struct daemon_data *ddata = (struct daemon_data*)user_data;
if (read(ddata->ipc->ui_fifo, &len, sizeof(int)) < 1) {
g_critical(_("Unable to read UI pipe"));
return TRUE;
}
if (len >= BUFFER_SIZE) {
g_critical(_("UI sent messae larger than buffer"));
return TRUE;
}
for (k = 0, l = len; l; l -= k) {
k = read(ddata->ipc->ui_fifo, buffer + k, l);
}
ddata->last_ping = time(NULL);
memcpy((void *) &ipc, buffer, sizeof(ipc_type));
switch(ipc) {
case REQ_ACK:
send_ipc(ddata->ipc->daemon_fifo, ACK);
break;
case ACK:
if (ddata->verbosity > 1)
printf(_("Daemon received ack\n"));
// No need for action
break;
case UNLINK_DAEMON_FILE:
snprintf(buffer, BUFFER_SIZE, "%s/%s/%s",
getenv("HOME"), GJAY_DIR, GJAY_DAEMON_DATA);
if (ddata->verbosity > 1)
printf(_("Deleting daemon pid file '%s'\n"), buffer);
unlink(buffer);
break;
case CLEAR_ANALYSIS_QUEUE:
snprintf(buffer, BUFFER_SIZE, "%s/%s/%s", getenv("HOME"),
GJAY_DIR, GJAY_QUEUE);
if (ddata->verbosity > 1)
printf(_("Daemon is clearing out analysis queue, deleting file '%s'\n"), buffer);
unlink(buffer);
for (list = g_list_first(queue); list; list = g_list_next(list))
g_free(list->data);
g_list_free(queue);
queue = NULL;
g_hash_table_destroy(queue_hash);
queue_hash = g_hash_table_new(g_str_hash, g_str_equal);
break;
case QUEUE_FILE:
/* If the file is not already in the queue, enqueue the file and
* also append the file name to the analysis log */
buffer[len] = '\0';
file = buffer + sizeof(ipc_type);
if (ddata->verbosity > 1)
printf(_("Daemon queuing song file '%s'\n"), file);
add_file_to_queue(file, ddata->verbosity);
g_idle_add (daemon_idle, ddata);
unlink(file);
break;
case DETACH:
if (ddata->mode == DAEMON) {
if (ddata->verbosity)
printf(_("Detaching daemon\n"));
ddata->mode = DAEMON_DETACHED;
g_idle_add (daemon_idle, ddata);
}
break;
case ATTACH:
if (ddata->mode != DAEMON) {
if (ddata->verbosity)
printf(_("Attaching to daemon\n"));
ddata->mode = DAEMON;
if(ddata->in_analysis && ddata->analyze_song)
send_analyze_song_name(ddata->ipc->daemon_fifo, ddata->analyze_song);
}
break;
case QUIT_IF_ATTACHED:
if (ddata->mode == DAEMON) {
if (ddata->verbosity)
printf(_("Daemon Quitting\n"));
g_main_quit ((GMainLoop * ) ddata->loop);
}
break;
default:
// Do nothing
break;
}
return TRUE;
}
static void
analyze(struct daemon_data *ddata,
const char * fname, /* File to analyze */
const gboolean result_to_stdout) /* Write result to stdout? */
{
FILE * f;
gchar * utf8;
wav_file wsfile;
int result, i;
char buffer[BUFFER_SIZE];
gdouble freq[NUM_FREQ_SAMPLES], volume_diff, analyze_bpm;
gboolean is_song;
song_file_type type;
time_t t=0;
ddata->analyze_song = NULL;
ddata->in_analysis = TRUE;
send_ui_percent(ddata->ipc->daemon_fifo, 0);
if (fname == NULL || fname[0] == '\0') {
ddata->in_analysis = FALSE;
return;
}
if (access(fname, R_OK) != 0) {
/* File ain't there! The UI thread will check for non-existant
files periodically. */
if (ddata->verbosity)
g_warning(_("analyze(): File '%s' cannot be read\n"),fname);
ddata->in_analysis = FALSE;
return;
}
ddata->analyze_song = create_song();
utf8 = strdup_to_utf8(fname);
song_set_path(ddata->analyze_song, utf8);
g_free(utf8);
file_info(ddata->verbosity,
ddata->ogg_supported, ddata->flac_supported,
ddata->analyze_song->path,
&is_song,
&ddata->analyze_song->inode,
&ddata->analyze_song->dev,
&ddata->analyze_song->length,
&ddata->analyze_song->title,
&ddata->analyze_song->artist,
&ddata->analyze_song->album,
&type);
if (!is_song) {
if (ddata->verbosity)
g_warning(_("File '%s' is not a recognised song.\n"),fname);
ddata->in_analysis = FALSE;
delete_song(ddata->analyze_song);
return;
}
send_analyze_song_name(ddata->ipc->daemon_fifo, ddata->analyze_song);
send_ipc_text(ddata->ipc->daemon_fifo, ANIMATE_START, ddata->analyze_song->path);
if ( (f = inflate_to_wav(ddata, fname, type)) == NULL)
{
if (ddata->verbosity)
g_warning(_("Unable to inflate song '%s'.\n"), fname);
ddata->in_analysis = FALSE;
delete_song(ddata->analyze_song);
return;
}
memset(&wsfile, 0x00, sizeof(wav_file));
wsfile.f = f;
if (fread(&wsfile.header, sizeof(waveheaderstruct), 1, f) < 1) {
g_warning(_("Unable to read WAV header '%s'.\n"), fname);
ddata->in_analysis = FALSE;
delete_song(ddata->analyze_song);
return;
}
/* Check to see if the decoder really decoded */
if (wsfile.header.main_chunk[0] == '\0') {
if (ddata->verbosity)
g_warning(_("Decoding of song '%s' failed, bad wav header.\n"), fname);
ddata->in_analysis = FALSE;
delete_song(ddata->analyze_song);
return;
}
wav_header_swab(&wsfile.header);
wsfile.header.data_length = (MAX(1, ddata->analyze_song->length - 1)) * wsfile.header.byte_p_sec;
if (ddata->verbosity) {
printf(_("Analyzing song file '%s'\n"), fname);
t = time(NULL);
}
result = run_analysis(ddata, &wsfile, freq, &volume_diff, &analyze_bpm);
if (ddata->verbosity)
printf(_("Analysis took %ld seconds\n"), time(NULL) - t);
send_ui_percent(ddata->ipc->daemon_fifo, 0);
if (result && ddata->analyze_song) {
for (i = 0; i < NUM_FREQ_SAMPLES; i++)
ddata->analyze_song->freq[i] = freq[i];
ddata->analyze_song->bpm = analyze_bpm;
if (isinf(ddata->analyze_song->bpm) || (ddata->analyze_song->bpm < MIN_BPM)) {
ddata->analyze_song->bpm_undef = TRUE;
} else {
ddata->analyze_song->bpm_undef = FALSE;
}
ddata->analyze_song->volume_diff = volume_diff;
ddata->analyze_song->no_data = FALSE;
}
/* Finish reading rest of output */
while ((result = fread(buffer, 1, BUFFER_SIZE, f)))
;
fclose(f);
send_ipc(ddata->ipc->daemon_fifo, ANIMATE_STOP);
send_ipc_text(ddata->ipc->daemon_fifo, STATUS_TEXT, "Idle");
if (result_to_stdout) {
write_song_data(stdout, ddata->analyze_song);
} else {
result = append_daemon_file(ddata->analyze_song);
}
if (result >= 0)
send_ipc_int(ddata->ipc->daemon_fifo, ADDED_FILE, result);
delete_song(ddata->analyze_song);
ddata->in_analysis = FALSE;
ddata->analyze_song = NULL;
return;
}
static void
check_decoders(struct daemon_data *ddata)
{
if (ddata->ogg_decoder == NULL)
ddata->ogg_decoder = g_find_program_in_path(OGG_DECODER_APP);
if (ddata->mp3_decoder == NULL)
ddata->mp3_decoder = g_find_program_in_path(MP3_DECODER_APP1);
if (ddata->mp3_decoder == NULL)
ddata->mp3_decoder = g_find_program_in_path(MP3_DECODER_APP2);
if (ddata->flac_decoder == NULL)
ddata->flac_decoder = g_find_program_in_path(FLAC_DECODER_APP);
}
static FILE *
inflate_to_wav (struct daemon_data *ddata, const gchar * path, const song_file_type type)
{
gchar *cmdline;
gchar *quoted_path;
FILE *fp;
quoted_path = g_shell_quote(path);
if (ddata->mp3_decoder == NULL)
check_decoders(ddata);
switch (type) {
case OGG:
if (ddata->ogg_decoder == NULL) {
if (ddata->verbosity)
g_warning(_("Unable to decode '%s' as no ogg decoder found"), path);
return NULL;
}
cmdline = g_strdup_printf("%s %s -d wav -f - 2> /dev/null",
ddata->ogg_decoder,
quoted_path);
break;
case MP3:
if (ddata->mp3_decoder == NULL) {
if (ddata->verbosity)
g_warning(_("Unable to decode '%s' as no mp3 decoder found"), path);
return NULL;
}
cmdline = g_strdup_printf("%s -w - -b 10000 %s 2> /dev/null",
ddata->mp3_decoder,
quoted_path);
break;
case FLAC:
if (ddata->flac_decoder == NULL) {
if (ddata->verbosity)
g_warning(_("Unable to decode '%s' as no flac decoder found"), path);
return NULL;
}
cmdline = g_strdup_printf("%s -d -c %s 2> /dev/null",
ddata->flac_decoder,
quoted_path);
break;
case WAV:
default:
g_free(quoted_path);
return fopen(path, "r");
}
g_free(quoted_path);
//fprintf(stderr,"Decoding with:\n ->%s\n->%s", cmdline,path);
if (!(fp = popen(cmdline, "r"))) {
g_error(_("Unable to run decoder command '%s'\n"), cmdline);
g_free(cmdline);
return NULL;
}
g_free(cmdline);
return fp;
}
/* Swap the byte order of wav header. Wavs are stored little-endian, so this
is necessary when using on big-endian (e.g. PPC) machines */
void
wav_header_swab(waveheaderstruct * header)
{
header->length = le32_to_cpu(header->length);
header->length_chunk = le32_to_cpu(header->length_chunk);
header->data_length = le32_to_cpu(header->data_length);
header->sample_fq = le32_to_cpu(header->sample_fq);
header->byte_p_sec = le32_to_cpu(header->byte_p_sec);
header->format = le16_to_cpu(header->format);
header->modus = le16_to_cpu(header->modus);
header->byte_p_spl = le16_to_cpu(header->byte_p_spl);
header->bit_p_spl = le16_to_cpu(header->bit_p_spl);
}
/**
* This is the big, bad analysis algorithm. To make things REALLY complicated,
* I'm interspersing two algorithsm -- BPM and frequency analysis -- such that
* we only have to do one decode pass. Whee!
*
* BPM algorithm taken from BpmDJ by Werner Van Belle.
*
* Frequency algorithm taken from spectromatic by Daniel Franklin.
*
* Any ugliness is the fault of my munging.
*/
static int
run_analysis (struct daemon_data *ddata,
wav_file * wsfile,
gdouble * freq_results,
gdouble * volume_diff,
gdouble * bpm_result )
{
int16_t *freq_data;
double *ch1 = NULL, *ch2 = NULL, *mags = NULL;
long i, j, k, bin;
double *total_mags;
double sum, frame_sum, max_frame_sum, g_factor, freq, g_freq;
signed short buffer[BPM_BUF_SIZE];
long count, pos, h, redux, num_frames;
unsigned long startshift = 0, stopshift = 0;
unsigned char *audio;
unsigned long audiosize;
if (wsfile->header.modus != 1 && wsfile->header.modus != 2) {
if (ddata->verbosity > 2)
g_warning(_("File is not a (converted) wav file. Modus is supposed to be 1 or 2 but is %d\n"), wsfile->header.modus);
// Not a wav file
return FALSE;
}
if (wsfile->header.byte_p_spl / wsfile->header.modus != 2) {
if (ddata->verbosity > 2)
g_warning(_("File is not a 16-bit stream\n"));
// Not 16-bit
return FALSE;
}
/* Spectrum set-up */
read_buffer_size = WINDOW_SIZE*4;
read_buffer = malloc(read_buffer_size);
read_buffer_start = 0;
read_buffer_end = read_buffer_size;
freq_data = (int16_t*) g_malloc0 (WINDOW_SIZE * wsfile->header.byte_p_spl);
mags = (double*) g_malloc0 (WINDOW_SIZE / 2 * sizeof (double));
total_mags = (double*) g_malloc0 (WINDOW_SIZE / 2 * sizeof (double));
//memset (total_mags, 0x00, WINDOW_SIZE / 2 * sizeof (double));
memset (freq_results, 0x00, NUM_FREQ_SAMPLES * sizeof(double));
ch1 = (double*) g_malloc0 (WINDOW_SIZE * sizeof (double));
if (wsfile->header.modus == 2)
ch2 = (double*) g_malloc0 (WINDOW_SIZE * sizeof (double));
num_frames = 0;
max_frame_sum = 0;
sum = 0;
/* BPM set-up */
audiosize = wsfile->header.data_length;
audiosize/=(4*(44100/AUDIO_RATE));
audio= g_malloc0(audiosize+1);
assert(audio);
pos=0;
/* Read the first chunk of the file into the shared buffer */
if (fread(wsfile->buffer, 1, SHARED_BUF_SIZE, wsfile->f) < 1) {
if (ddata->verbosity > 2)
g_warning(_("Cannot load WAV file first chunk"));
return FALSE;
}
wsfile->seek = SHARED_BUF_SIZE;
/* Copy the first bit of this into the freq. analysis buffer */
memcpy(read_buffer, wsfile->buffer, read_buffer_size);
wsfile->freq_seek = read_buffer_size;
/* In this main loop, we read the entire file. Most of this loop
* represents the spectrum algorithm; the marked tight loop is the bpm
* algorithm. */
for (i = -WINDOW_SIZE; i < WINDOW_SIZE + (int)(wsfile->header.data_length / wsfile->header.byte_p_spl); i += STEP_SIZE) {
freq_read_frames (wsfile, i, WINDOW_SIZE, (char *)freq_data);
if (wsfile->freq_seek == SHARED_BUF_SIZE) {
/* At end of buffer. Read some more data. */
count = fread(wsfile->buffer, 1, SHARED_BUF_SIZE, wsfile->f);
memcpy(buffer, wsfile->buffer, SHARED_BUF_SIZE);
wsfile->freq_seek = 0;
wsfile->seek += count;
/* Update status bar. This chunk takes ~70% of the time */
send_ui_percent(ddata->ipc->daemon_fifo, wsfile->seek/(wsfile->header.data_length / 70));
/* BPM loop */
for (h=0;h<count/2;h+=2*(44100/AUDIO_RATE))
{
signed long int left, right,mean;
left=abs(buffer[h]);
right=abs(buffer[h+1]);
mean=(left+right)/2;
redux=abs(mean)/128;
if (pos+h/(2*(44100/AUDIO_RATE))>=audiosize) break;
assert(pos+h/(2*(44100/AUDIO_RATE))<audiosize);
audio[pos+h/(2*(44100/AUDIO_RATE))]=(unsigned char)redux;
}
pos+=count/(4*(44100/AUDIO_RATE));
}
/* The rest of this loop is spectrum analysis */
if (wsfile->header.modus == 1) {
for (j = 0; j < WINDOW_SIZE; j++)
ch1 [j] = (int16_t)le16_to_cpu(freq_data[j]);
gsl_fft_real_radix2_transform (ch1, 1, WINDOW_SIZE);
} else {
for (j = 0, k = 0; k < WINDOW_SIZE; k++, j+=2) {
ch1[k] = (double)((int16_t)le16_to_cpu(freq_data[j]));
ch2[k] = (double)((int16_t)le16_to_cpu(freq_data[j+1]));
}
gsl_fft_real_radix2_transform (ch1, 1, WINDOW_SIZE);
gsl_fft_real_radix2_transform (ch2, 1, WINDOW_SIZE);
}
// mags [0] = fabs (ch1 [0]);
for (j = 0; j < WINDOW_SIZE / 2; j++) {
double square_this = ch1 [j] * ch1 [j] + ch1 [WINDOW_SIZE - j] * ch1 [WINDOW_SIZE - j];
if (square_this > 0.0 && square_this < BROKEN_VAL)
mags [j] = sqrt (square_this);
else
mags [j] = 0;
}
/* Add magnitudes */
for (frame_sum = 0, k = 0; k < WINDOW_SIZE / 2; k++) {
total_mags[k] += mags[k];
frame_sum += mags[k];
}
max_frame_sum = MAX(frame_sum, max_frame_sum);
sum += frame_sum;
num_frames++;
if (wsfile->header.modus == 2) {
for (j = 0; j < WINDOW_SIZE / 2; j++) {
double square_this = ch2 [j] * ch2 [j] + ch2 [WINDOW_SIZE - j] * ch2 [WINDOW_SIZE - j];
if ( square_this > 0 && square_this < BROKEN_VAL)
mags [j] = sqrt (square_this);
else
mags [j] = 0;
}
/* Add magnitudes */
for (frame_sum = 0, k = 0; k < WINDOW_SIZE / 2; k++) {
total_mags[k] += mags[k];
frame_sum += mags[k];
}
max_frame_sum = MAX(frame_sum, max_frame_sum);
sum += frame_sum;
num_frames++;
}
}
/* Finish analysis... */
*volume_diff = max_frame_sum / (sum / (gdouble) num_frames);
for (k = 0; k < WINDOW_SIZE / 2; k++)
total_mags[k] = (total_mags[k] / sum) * MAGS_MULTIPLIER;
g_freq = START_FREQ;
g_factor = exp( log(MAX_FREQ/START_FREQ) / NUM_FREQ_SAMPLES);
bin = 0;
for (k = 0; k < WINDOW_SIZE / 2; k++) {
/* Determine which frequency band this sample falls into */
freq = (k * MAX_FREQ ) / (WINDOW_SIZE / 2);
if (freq > g_freq) {
bin = MIN(bin + 1, NUM_FREQ_SAMPLES - 1);
g_freq *= g_factor;
}
freq_results[bin] += total_mags[k];
}
if (ddata->verbosity > 1) {
printf(_("Frequencies: \n"));
for (k = 0; k < NUM_FREQ_SAMPLES; k++)
printf("%f ", freq_results[k]);
printf("\n");
}
/* Complete BPM analysis */
stopshift=AUDIO_RATE*60*4/START_BPM;
startshift=AUDIO_RATE*60*4/STOP_BPM;
{
unsigned long foutat[stopshift-startshift];
unsigned long fout, minimumfout=0, maximumfout,minimumfoutat=ULONG_MAX,
left,right;
memset(&foutat,0,sizeof(foutat));
for(h=startshift;h<stopshift;h+=50)
{
fout=bpm_phasefit(h, audio, audiosize);
foutat[h-startshift]=fout;
if (minimumfout==0) maximumfout=minimumfout=fout;
if (fout<minimumfout)
{
minimumfout=fout;
minimumfoutat=h;
}
if (fout>maximumfout) maximumfout=fout;
send_ui_percent (ddata->ipc->daemon_fifo, 70 + ((15*(h - startshift)) / (stopshift - startshift)));
}
left=minimumfoutat-100;
right=minimumfoutat+100;
if ( left < startshift )
left = startshift;
if ( right > stopshift )
right = stopshift;
for(h=left; h<right; h++) {
fout=bpm_phasefit(h, audio, audiosize);
foutat[h-startshift]=fout;
if (minimumfout==0) maximumfout=minimumfout=fout;
if (fout<minimumfout)
{
minimumfout=fout;
minimumfoutat=h;
}
if (fout>maximumfout) maximumfout=fout;
send_ui_percent(ddata->ipc->daemon_fifo, 85 + ((15*(h - left)) / (right - left)));
}
for(h=startshift;h<stopshift;h++) {
fout=foutat[h-startshift];
if (fout)
{
fout-=minimumfout;
}
}
*bpm_result = 4.0*(double)AUDIO_RATE*60.0/(double)minimumfoutat;
if (ddata->verbosity > 1)
printf(_("BPM: %f\n"), *bpm_result);
}
g_free (audio);
g_free (freq_data);
g_free (mags);
g_free (total_mags);
g_free (read_buffer);
return TRUE;
}
static int
freq_read_frames (wav_file * wsfile, int start, int length, void *data)
{
int realstart = start;
int reallength = length;
int offset = 0;
int seek, len;
if (start + length < 0 || start > (int)(wsfile->header.data_length / wsfile->header.byte_p_spl)) {
memset (data, 0, length * wsfile->header.byte_p_spl);
return 0;
}
if (start < 0) {
offset = -start;
memset (data, 0, offset * wsfile->header.byte_p_spl);
realstart = 0;
reallength += start;
}
if (start + length > (int)(wsfile->header.data_length / wsfile->header.byte_p_spl)) {
reallength -= start + length - (wsfile->header.data_length / wsfile->header.byte_p_spl);
memset (data, 0, reallength * wsfile->header.byte_p_spl);
}
seek = ((realstart + offset) * wsfile->header.byte_p_spl);
len = wsfile->header.byte_p_spl * reallength;
if (seek + len <= read_buffer_size) {
memcpy(data + offset * wsfile->header.byte_p_spl,
read_buffer + seek,
wsfile->header.byte_p_spl * reallength);
} else {
if (seek + len > read_buffer_end) {
char * new_buffer = malloc(read_buffer_size);
int shift = seek + len - read_buffer_end;
memcpy(new_buffer,
read_buffer + shift,
read_buffer_size - shift);
free(read_buffer);
read_buffer = new_buffer;
memcpy (read_buffer + read_buffer_size - shift,
wsfile->buffer + wsfile->freq_seek,
shift);
wsfile->freq_seek += shift;
read_buffer_start += shift;
read_buffer_end += shift;
}
memcpy(data + offset * wsfile->header.byte_p_spl,
read_buffer + seek - read_buffer_start,
wsfile->header.byte_p_spl * reallength);
}
return 1;
}
static unsigned long
bpm_phasefit(const long i, const unsigned char const *audio,
const unsigned long audiosize)
{
long c,d;
unsigned long mismatch=0;
unsigned long prev=mismatch;
for(c=i;c<audiosize;c++)
{
d=abs((long)audio[c]-(long)audio[c-i]);
prev=mismatch;
mismatch+=d;
assert(mismatch>=prev);
}
return mismatch;
}
static void
send_ui_percent (const int fd, int percent)
{
static int old_percent = -1;
if (old_percent == percent)
return;
if (percent < 0)
percent = 0;
if (percent > 100)
percent = 100;
old_percent = percent;
send_ipc_int(fd, STATUS_PERCENT, percent);
/* This is a bit of a hack, but... anytime we care enough to pause
* analysis so we can send the percentage, run an iteration of the
* event loop */
if (g_main_pending())
g_main_iteration(TRUE);
}
static void
send_analyze_song_name ( const int fd, GjaySong *song )
{
char buffer[BUFFER_SIZE];
if (!song)
return;
if (song->title && song->artist)
g_snprintf(buffer, BUFFER_SIZE, "%s : %s", song->artist, song->title);
else
g_snprintf(buffer, BUFFER_SIZE, "%s", song->path);
strncpy(buffer + 60, "...\0", 4);
send_ipc_text(fd, STATUS_TEXT, buffer);
}
static void
analysis_daemon(struct daemon_data *ddata) {
GIOChannel * ui_io;
char buffer[BUFFER_SIZE];
gchar * file;
FILE * f;
/* Nice the analysis */
setpriority(PRIO_PROCESS, getpid(), 19);
ddata->in_analysis = FALSE;
ddata->loop = g_main_new(FALSE);
ddata->last_ping = time(NULL);
queue_hash = g_hash_table_new(g_str_hash, g_str_equal);
/* Read analysis queue, if any */
snprintf(buffer, BUFFER_SIZE, "%s/%s/%s", getenv("HOME"),
GJAY_DIR, GJAY_QUEUE);
f = fopen(buffer, "r");
if (f) {
while (!feof(f)) {
read_line(f, buffer, BUFFER_SIZE);
if (strlen(buffer) &&!g_hash_table_lookup(queue_hash, buffer)) {
file = g_strdup(buffer);
g_hash_table_insert(queue_hash, file, (void *) 1);
queue = g_list_append(queue, file);
}
}
fclose(f);
}
ui_io = g_io_channel_unix_new (ddata->ipc->ui_fifo);
g_io_add_watch (ui_io,
G_IO_IN,
ui_pipe_input,
ddata);
g_idle_add (daemon_idle, ddata);
// FIXME: add G_IO_HUP watcher
g_main_run(ddata->loop);
}
gboolean daemon_idle (gpointer data) {
gchar * file;
struct daemon_data *ddata = (struct daemon_data*)data;
if ((ddata->mode != DAEMON_DETACHED) &&
(time(NULL) - ddata->last_ping > DAEMON_ATTACH_FREAKOUT)) {
if (ddata->verbosity)
printf(_("Daemon appears to have been orphaned. Quitting.\n"));
g_main_quit(ddata->loop);
}