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* Copyright (C) 2003 Andy Lo A Foe <andy@alsaplayer.org>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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* $Id: scopes.cpp 1032 2004-02-15 23:02:12Z adnans $
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#include "AlsaPlayer.h"
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#include "AlsaSubscriber.h"
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#include "alsaplayer_error.h"
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#include "alsaplayer_fft.h"
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#include <sys/types.h>
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static scope_entry *root_scope = NULL;
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static pthread_mutex_t sl_mutex;
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static AlsaSubscriber *scopes = NULL;
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void unregister_scopes(void);
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bool register_scope(scope_plugin *plugin, bool, void *);
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void unload_scope_addons()
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void load_scope_addons()
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scope_plugin_info_type scope_plugin_info;
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snprintf(path, sizeof(path)-1, "%s/scopes2", global_pluginroot);
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DIR *dir = opendir(path);
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while ((entry = readdir(dir)) != NULL) { // For each file in scopes
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if (strcmp(entry->d_name, ".") == 0 ||
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strcmp(entry->d_name, "..") == 0) {
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sprintf(path, "%s/scopes2/%s", global_pluginroot, entry->d_name);
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if (stat(path, &buf)) continue;
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if (S_ISREG(buf.st_mode)) {
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char *ext = strrchr(path, '.');
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if (strcasecmp(ext, "so"))
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if ((handle = dlopen(path, RTLD_NOW |RTLD_GLOBAL))) {
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scope_plugin_info = (scope_plugin_info_type) dlsym(handle, "scope_plugin_info");
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if (scope_plugin_info) {
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alsaplayer_error("Loading scope addon: %s", path);
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tmp = scope_plugin_info();
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if (!register_scope(tmp, false, NULL)) {
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alsaplayer_error("%s is deprecated", path);
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printf("%s\n", dlerror());
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void dl_close_scopes()
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scope_entry *current = root_scope;
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dlclose(current->sp->handle);
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current = current->next;
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void scope_entry_destroy_notify(gpointer)
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#define SCOPE_BUFFER 2048
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bool scope_feeder_func(void *arg, void *data, int size)
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static char buf[32768];
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static int latency = -1;
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static int fft_buf[512];
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static int buf_size = 0;
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static AlsaNode *the_node = NULL;
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static double fftmult[FFT_BUFFER_SIZE / 2 + 1];
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static sound_sample left_actEq[SCOPE_BUFFER];
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static double left_fftout[FFT_BUFFER_SIZE / 2 + 1];
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static fft_state *left_fftstate;
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static sound_sample right_actEq[SCOPE_BUFFER];
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static double right_fftout[FFT_BUFFER_SIZE / 2 + 1];
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static fft_state *right_fftstate;
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sound_sample *left_newset;
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sound_sample *right_newset;
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//alsaplayer_error("In scope_feeder_func()");
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for(i = 0; i <= FFT_BUFFER_SIZE / 2 + 1; i++) {
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double mult = (double)128 / ((FFT_BUFFER_SIZE * 16384) ^ 2);
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mult *= log(i + 1) / log(2);
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right_fftstate = fft_init();
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left_fftstate = fft_init();
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if (!left_fftstate || !right_fftstate)
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alsaplayer_error("WARNING: could not do fft_init()");
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buf_size = SCOPE_BUFFER <= (FFT_BUFFER_SIZE * 2) ? SCOPE_BUFFER : FFT_BUFFER_SIZE;
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the_node = (AlsaNode *)arg;
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latency = the_node->GetLatency();
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if (latency < SCOPE_BUFFER)
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latency = SCOPE_BUFFER;
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scope_entry *se = root_scope;
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//buffer_effect(data, size);
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if (fill + size >= SCOPE_BUFFER) {
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left = SCOPE_BUFFER - fill;
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memcpy(buf + fill, data, left);
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left_newset = left_actEq;
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right_newset = right_actEq;
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sound = (short *)buf;
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//sound = (short *)delay_feed(latency, SCOPE_BUFFER);
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for (i = 0; i < buf_size; i++) {
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*left_newset++ = (sound_sample)((int)(*sound));
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*right_newset++ = (sound_sample)((int)(*(sound+1)));
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fft_perform(right_actEq, right_fftout, right_fftstate);
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fft_perform(left_actEq, left_fftout, left_fftstate);
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for (i = 0, left_pos = fft_buf, right_pos = fft_buf + 256; i < 256; i++) {
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left_pos[i] = (int)(sqrt(left_fftout[i + 1])) >> 8; //* fftmult[i]);
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right_pos[i] = (int)(sqrt(right_fftout[i + 1])) >> 8; //* fftmult[i]);
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while (se && se->sp && se->active) {
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if (se->sp->running()) {
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if (se->sp->set_data)
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se->sp->set_data((short *)buf, SCOPE_BUFFER >> 1);
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se->sp->set_fft((int *)fft_buf, 256, 2);
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// Copy the remainder
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memcpy(buf + fill, ((char *)data) + left, size - left);
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memcpy(buf + fill, data, size);
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void unregister_scopes(void)
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scope_entry *current = root_scope;
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pthread_mutex_lock(&sl_mutex);
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while (current && current->sp) {
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//printf("closing and unloading scope plugin %s\n", current->sp->name);
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current->sp->shutdown();
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current = current->next;
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pthread_mutex_unlock(&sl_mutex);
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bool register_scope(scope_plugin *plugin, bool run, void *arg)
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se = new scope_entry;
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se->next = (scope_entry *)NULL;
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if (se->sp->version != SCOPE_PLUGIN_VERSION) {
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alsaplayer_error("Wrong version number on scope plugin (v%d, wanted v%d)",
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se->sp->version - 0x1000,
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SCOPE_PLUGIN_VERSION - 0x1000);
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if (!se->sp->init(arg)) {
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// Add scope to scope list
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// NOTE: WE CURRENTLY NEVER UNLOAD SCOPES
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pthread_mutex_lock(&sl_mutex);
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if (root_scope == NULL) {
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//alsaplayer_error("registering first scope...");
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root_scope->next = (scope_entry *)NULL;
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root_scope->active = 1;
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} else { // Not root scope, so insert it at the start
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se->next = root_scope->next;
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root_scope->next = se;
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pthread_mutex_unlock(&sl_mutex);
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void scopes_list_click(GtkWidget *widget, gint row, gint /* column */,
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GdkEvent *bevent, gpointer /* data */)
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if (bevent && bevent->type == GDK_2BUTTON_PRESS) {
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scope_entry *se = (scope_entry *)
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gtk_clist_get_row_data(GTK_CLIST(widget), row);
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se->active = 1 - se->active;
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gtk_clist_set_pixmap(GTK_CLIST(widget),
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row, 0, active_pix, active_mask);
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gtk_clist_set_text(GTK_CLIST(widget),
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bool init_scopes(AlsaNode *node)
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pthread_mutex_init(&sl_mutex, (pthread_mutexattr_t *)NULL);
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alsaplayer_error("Huh, no node?");
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scopes = new AlsaSubscriber();
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scopes->Subscribe(node, POS_END);
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scopes->EnterStream(scope_feeder_func, node);
added
removed
interface/gtk2/scopes.cpp
