~audio-recorder/audio-recorder/trunk

/*
 * Copyright (c) 2011- Osmo Antero.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License (GPL3), or 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 Library General Public License 3 for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License 3 along with this program; if not, see /usr/share/common-licenses/GPL file
 * or <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <glib.h>
#include <glib/gprintf.h>
#include <gdk/gdk.h>
#include <gio/gio.h>
#include <gio/gdesktopappinfo.h>
#include <unistd.h>

#include "dconf.h"
#include "log.h"
#include "utility.h"
#include "support.h"
#include "dbus-player.h"

#include "audio-sources.h"

// MPRIS2 compliant players.
#include "dbus-mpris2.h"

// Send commands to rec-manager.c
#include "rec-manager-struct.h"

// rec-manager.c
#include "rec-manager.h"

// List of players
static GHashTable *g_player_list = NULL;

static void dbus_player_disconnect_signals();
static void dbus_player_clear_list();

static void dbus_player_get_saved();
static void dbus_player_save(MediaPlayerRec *pl);
static void dbus_player_delete_saved(const gchar *service_name);
static gboolean dbus_player_msg_is_duplicate(MediaPlayerRec *player);

static const gchar *status_name(gint status) __attribute__((unused));

gboolean add_player_to_list(gchar *desktop_file, gchar *service_name);

void dbus_player_init() {
    LOG_DEBUG("Init dbus-player.c.\n");

    g_player_list = NULL;

    mpris2_module_init();
}

void dbus_player_exit() {
    LOG_DEBUG("Clean up dbus-player.c.\n");

    // Disconnect DBus signals for all Media Players
    dbus_player_disconnect_signals();

    // Clear the player list
    dbus_player_clear_list();

    mpris2_module_exit();
}

static RecorderCommand *convert_data(MediaPlayerRec *pl) {
    // Convert MediaPlayerRec to RecorderCommand

    if (!pl) return NULL;
    TrackInfo *tr = &pl->track;

    RecorderCommand *cmd = g_malloc0(sizeof(RecorderCommand));

    cmd->title = g_strndup(tr->title, MPRIS_STRLEN);
    cmd->artist = g_strndup(tr->artist, MPRIS_STRLEN);  // Actually a list of artists separated by '\v' (should we remove '\v'?)  
    cmd->album = g_strndup(tr->album, MPRIS_STRLEN);
    cmd->genre = g_strndup(tr->genre, MPRIS_STRLEN); // Actually a list of genres separated by '\v' (should we remove '\v'?)

    cmd->albumArtist = g_strndup(tr->albumArtist, MPRIS_STRLEN); // Actually a list of albumArtists separated by '\v' (should we remove '\v'?)
    cmd->url = g_strndup(tr->url, MPRIS_STRLEN);
    cmd->artUrl = g_strndup(tr->artUrl, MPRIS_STRLEN);

    cmd->trackId = g_strndup(tr->trackId, MPRIS_STRLEN);
    cmd->trackNumber = tr->trackNumber;

    cmd->discNumber = tr->discNumber;

    cmd->trackLength = tr->trackLength;
    cmd->trackPos = tr->trackPos;

    cmd->flags = tr->flags;

    if (tr->status == PLAYER_STATUS_PAUSED) {
        cmd->type = RECORDING_PAUSE;

    } else if (tr->status == PLAYER_STATUS_PLAYING) {
        cmd->type = RECORDING_START;

    } else if (tr->status == PLAYER_STATUS_NOTIFY_MSG) {
        cmd->type = RECORDING_NOTIFY_MSG;

    } else {
        // tr.status == PLAYER_STATUS_CLOSED ||
        // tr.status == PLAYER_STATUS_STOPPED
        cmd->type = RECORDING_STOP;
    }

    return cmd;
}

static gboolean dbus_player_msg_is_duplicate(MediaPlayerRec *player) {
    // Check if player->track (TrackInfo) is duplicate of the previous one.
    // Return TRUE if duplicate, otherwise FALSE. 
    if (!player) return FALSE;

    // Track info
    TrackInfo *tr = &player->track;

    // Track info
    TrackInfo *prev_tr = &player->prev_track;

    // Check if message is duplicate of previous one
    //if (tr->trackLength != prev_tr->trackLength) return FALSE;
    //if (tr->trackPos != prev_tr->trackPos) return FALSE;

    if (tr->trackNumber != prev_tr->trackNumber) {
        return FALSE;
    }
    
    if (tr->discNumber != prev_tr->discNumber) {
        return FALSE;
    }

    if (tr->audioBitrate != prev_tr->audioBitrate) {
        return FALSE;
    }

    if (str_compare(tr->title, prev_tr->title, FALSE)) {
        return FALSE;
    }

    if (str_compare(tr->artist, prev_tr->artist, FALSE)) {
        return FALSE;
    }

    if (str_compare(tr->album, prev_tr->album, FALSE)) {
        return FALSE;
    }

    if (str_compare(tr->genre, prev_tr->genre, TRUE)) {
        return FALSE;
    }

    if (str_compare(tr->albumArtist, prev_tr->albumArtist, FALSE)) {
        return FALSE;
    }

    if (str_compare(tr->url, prev_tr->url, FALSE)) {
        return FALSE;
    }

    //if (str_compare(tr->artUrl, prev_tr->artUrl)) return FALSE;

    if (str_compare(tr->trackId, prev_tr->trackId, FALSE)) {
        return FALSE;
    }

    if (str_compare(tr->contentCreated, prev_tr->contentCreated, FALSE)) {
        return FALSE;
    }

    // This TrackInfo is 100% duplicate of the previous one
    return TRUE;
}

void dbus_player_process_data(gpointer player_rec, gboolean restart) {
    // Send message to the rec-manager.c

    MediaPlayerRec *player = (MediaPlayerRec*)player_rec;
    if (!player) return;

    // Current track
    TrackInfo *tr = &player->track;

    // Previous track (saved track data)
    TrackInfo *prev_tr = &player->prev_track;

    // Got PLAYING message from media player? 
    if (tr->status == PLAYER_STATUS_PLAYING) {

        // Note !
        // Check if this message from DBus is duplicate of previous one.
        // Some media players send numerous duplicate messages. Messages confuse audio recorder.
        if (dbus_player_msg_is_duplicate(player)) {

            // Increment duplicate msg count. This is just for debugging!.
            player->msg_count++;

            // Is recording paused?
            gboolean is_paused = rec_manager_is_paused();

            if (is_paused) {

                LOG_PLAYER("%s: This DBus message (#%i) is duplicate of previous one. Continuing PAUSED recording.\n", player->app_name, player->msg_count+1);
           
                // Continue paused recording
                rec_manager_continue_recording();

            } else {

                LOG_PLAYER("%s: This DBus message (#%i) is duplicate of previous one, %s. Dropping this message.\n", 
                        player->app_name, player->msg_count+1, status_name(tr->status));
            }

            // Is duplicate. Drop this message. 
            return;
        }

        
        // Start new recording

        // Stop the player first?
        if (restart ) { // || (tr->status == PLAYER_STATUS_STOP)
            rec_manager_stop_recording();
        }

        // Save, remember this track for next time !
        memcpy(prev_tr, tr, sizeof(TrackInfo));

        // Set msg count to 1 (just for debugging)
        player->msg_count = 1;

        // Continues to LBL_1
    }


    // Got PAUSED message from media player? 
    if (tr->status == PLAYER_STATUS_PAUSED) {
        // Do nothing.
        // Continues to LBL_1
    }

    // Got STOPPED message from media player? 
    if (tr->status == PLAYER_STATUS_STOPPED) {
        // Nullify prev_tr (forget lastly received track data) 
        memset(prev_tr, '\0', sizeof(TrackInfo));
    }

// LBL_1:

    // Debug:
    //dbus_player_debug_print(player);

    // Convert MediaPlayerRec to RecorderCommand
    RecorderCommand *cmd = convert_data(player);

    // Send this command to rec-manager queue. 
    // Rec-manager will free the cmd structure after processing.
    rec_manager_send_command(cmd);
}

void dbus_player_player_changed(gchar *service_name) {
    // Re-connect DBus signals/methods for the given service_name (Media Player etc.)

    // Disconnect all signals/object methods
    dbus_player_disconnect_signals();

    // Get MediaPlayerRec for this service_name
    MediaPlayerRec *player = dbus_player_lookup_service_name(service_name);

    if (player && player->func_set_signals) {

        LOG_PLAYER("Connect DBus signals for %s (%s).\n", player->app_name, player->service_name);

        // Start application (Media Player, etc)
        if (player->func_start_app) {
            player->func_start_app(player);
        }

        // Connect signals so we receive track-changed/start/stop messages from this app (over DBus)
        player->func_set_signals(player, TRUE); // TRUE=connect/register, FALSE=disconnect/unregister

        // Save this player in GSettings so user doesn't need to refresh the combo manually.
        dbus_player_save(player);
    }
}

static void dbus_player_disconnect_signals() {
    // Disconnect all signal-functions from the DBus
    GHashTableIter iter;
    gpointer key, value;

    g_hash_table_iter_init(&iter, g_player_list);
    while (g_hash_table_iter_next(&iter, &key, &value)) {
        MediaPlayerRec *player = (MediaPlayerRec*)value;
        if (player && player->func_set_signals) {
            // Disconnect signals
            player->func_set_signals(player, FALSE); // FALSE=disconnect/unregister
        }
    }
}

GHashTable *dbus_player_get_list_ref() {
    if (!g_player_list) {
        g_player_list = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, dbus_player_delete_item);
    }

    return g_player_list;
}

static gboolean dbus_palyer_remove_node(gpointer key, gpointer value, gpointer user_data) {
    // Return TRUE so this (key, value) pair gets removed and deleted.
    return TRUE;
}

static void dbus_player_clear_list() {
    // Delete the entire g_player_list
    if (g_player_list) {
        g_hash_table_foreach_remove(g_player_list, dbus_palyer_remove_node, NULL);
        g_hash_table_unref(g_player_list);
    }
    g_player_list = NULL;
}

void dbus_player_delete_item(gpointer data) {
    MediaPlayerRec *player = (MediaPlayerRec*)data;
    if (!player) return;

    LOG_PLAYER("dbus_player_delete_item: %s (%s).\n", player->app_name, player->service_name);

    if (player->func_set_signals) {
        // Disconnect signals
        player->func_set_signals(player, FALSE); // TRUE=connect, FALSE=disconnect
    }

    if (G_IS_DBUS_PROXY(player->proxy)) {
        g_object_unref(player->proxy);
    }
    player->proxy = NULL;

    if (G_IS_DBUS_PROXY(player->prop_proxy)) {
        g_object_unref(player->prop_proxy);
    }
    player->prop_proxy = NULL;

    g_free(player->service_name);
    g_free(player->desktop_file);
    g_free(player->exec_cmd);
    g_free(player->app_name);
    g_free(player->icon_name);

    g_free(player);
}

MediaPlayerRec *dbus_player_lookup_app_name(const gchar *app_name) {
    // Lookup player by its application name (p->app_name).
    // Typical app_names are "Amarok 2.3.2", "RhythmBox 2.3".
    GHashTableIter iter;
    gpointer key, value;

    if (str_length(app_name, 1024) < 1) return NULL;

    g_hash_table_iter_init(&iter, g_player_list);
    while (g_hash_table_iter_next(&iter, &key, &value)) {
        MediaPlayerRec *p = (MediaPlayerRec*)value;
        if (!g_strcmp0(p->app_name, app_name)) {
            return p;
        }
    }
    return NULL;
}

MediaPlayerRec *dbus_player_lookup_service_name(const gchar *service_name) {
    // Lookup player by its service name (p->service_name).
    // "org.mpris.MediaPlayer2.Player.banshee" is a typical service_name.
    GHashTableIter iter;
    gpointer key, value;

    if (str_length(service_name, 1024) < 1) return NULL;

    g_hash_table_iter_init(&iter, g_player_list);
    while (g_hash_table_iter_next(&iter, &key, &value)) {
        MediaPlayerRec *p = (MediaPlayerRec*)value;
        if (!g_strcmp0(p->service_name, service_name)) {
            return p;
        }
    }
    return NULL;
}

static const gchar *status_name(gint status) {
static gchar s[80]; 

    s[0] = '\0';

    switch (status) {

    case PLAYER_STATUS_CLOSED:
        g_sprintf(s, "Status:%d  PLAYER_STATUS_CLOSED (not running)", status);
        break;

    case PLAYER_STATUS_STOPPED:
        g_sprintf(s, "Status:%d  PLAYER_STATUS_STOPPED", status);
        break;

    case PLAYER_STATUS_PAUSED:
        g_sprintf(s, "Status:%d  PLAYER_STATUS_PAUSED", status);
        break;

    case PLAYER_STATUS_PLAYING:
        g_sprintf(s, "Status:%d  PLAYER_STATUS_PLAYING", status);
        break;

    case PLAYER_STATUS_NOTIFY_MSG:
        // Simply a msg to the GUI.
        g_sprintf(s, "Status:%d  PLAYER_STATUS_NOTIFY_MSG", status);
        break;

    default:
        g_sprintf(s, "Unknown status:%d\n", status);
    }

    return &s[0];
}

void dbus_player_debug_print(MediaPlayerRec *p) {
    if (!p) return;

    LOG_PLAYER("------------------------------\n");

    LOG_PLAYER("Player app name:%s\n", p->app_name);
    LOG_PLAYER("Service name:%s\n", p->service_name);
    LOG_PLAYER("Desktop file:%s.desktop\n", p->desktop_file);
    LOG_PLAYER("Executable command:%s\n", p->exec_cmd);

    TrackInfo *tr = &p->track;

    LOG_PLAYER("%s\n", status_name(tr->status));

    if (tr->status != PLAYER_STATUS_NOTIFY_MSG) {
        LOG_PLAYER("Title:%s\n", tr->title);
        LOG_PLAYER("Artist:%s\n", tr->artist);
        LOG_PLAYER("Album:%s\n", tr->album);
        LOG_PLAYER("Genre:%s\n", tr->genre);
        LOG_PLAYER("AlbumArtist:%s\n", tr->albumArtist);
        LOG_PLAYER("Url:%s\n", tr->url);
        LOG_PLAYER("ArtUrl:%s\n", tr->artUrl);
        LOG_PLAYER("TrackId:%s\n", tr->trackId);
        LOG_PLAYER("ContentCreated:%s\n", tr->contentCreated);


        LOG_PLAYER("Track length in microsecs:%ld\n", tr->trackLength);
        LOG_PLAYER("Track pos in microsecs:%ld\n", tr->trackPos);
        LOG_PLAYER("Flags:%d\n", tr->flags);

        LOG_PLAYER("Msg count:%d\n", p->msg_count);


    } else {
        // Simply a msg to the GUI.
        LOG_PLAYER("Message:%s\n", tr->title);
    }

    LOG_PLAYER("------------------------------\n");
}

GHashTable *dbus_player_get_player_list() {
    // Clear the old list
    dbus_player_clear_list();

    // Populate the list.
    // Detect players that follow the org.mpris.MediaPlayer2.* standard.
    mpris2_detect_players();

    // Add lastly used and saved players to the list
    dbus_player_get_saved();

    // Make sure the most popular players are in the list (on our target distros).
    // Notice: Audio-recorder will automatically detect and remember the last used players.
    //         Start your media-player, then press [Refresh]-button at end of Source: listbox to detect it.
    //         You do not need to hard-code other, new players here.

    // Add Rhythmbox manually (check if installed)
    add_player_to_list("rhythmbox", "org.mpris.MediaPlayer2.rhythmbox");

    return g_player_list;
}

gboolean add_player_to_list(gchar *desktop_file, gchar *service_name) {
    // Add player manually to the list. Check if it's installed.

    // Already in the list?
    if (dbus_player_lookup_service_name(service_name)) return TRUE;

    // New MediaPlayer record
    MediaPlayerRec *player = mpris2_player_new(service_name);

    // Set desktop file
    player->desktop_file = g_strdup(desktop_file);

    // Read rest from player's .desktop file
    get_details_from_desktop_file(player, desktop_file);

    // Find executable /usr/bin/exec_cmd
    gchar *path = find_command_path(player->exec_cmd);

    if (!path) {
        // Not installed.
        dbus_player_delete_item(player);
        return FALSE;
    }
    g_free(path);

    // Function to connect/disconnect event signals for this player
    player->func_set_signals = mpris2_set_signals;

    // Function to get track-info (album, title/song name/title, genre, etc.)
    player->func_get_info = mpris2_get_metadata;

    // Function to start/run the media player
    player->func_start_app = mpris2_start_app;

    // Function to check if this player is running
    player->func_check_is_running = mpris2_service_is_running;

    if (!dbus_player_lookup_app_name(player->app_name)) {
        // Add to list
        GHashTable *player_list = dbus_player_get_list_ref();
        g_hash_table_insert(player_list, g_strdup(player->service_name), player);
    } else {
        // Duplicate or bad record. Free it.
        dbus_player_delete_item(player);
    }

    return TRUE;
}

void dbus_player_send_notification(gchar *msg) {
    RecorderCommand *cmd = g_malloc0(sizeof(RecorderCommand));
    cmd->type = RECORDING_NOTIFY_MSG;

    // Convey message in the title field
    cmd->title = g_strndup(msg, MPRIS_STRLEN);

    // Send command to rec-manager.c.
    // It will free the cmd structure after processing.
    rec_manager_send_command(cmd);
}

// --------------------------------------------------------------------
// Support functions to read/write values to "players/saved-player-list" in GSettings.
// --------------------------------------------------------------------

static void split_value(gchar *str, gchar **desktop_file, gchar **service_name) {
    // Split str on "\t" and return the parts.
    *desktop_file = NULL;
    *service_name = NULL;

    if (!str) return;

    // Split on '\t'
    gchar **args = g_strsplit(str, "\t", 3);

    // We cope only 2 arguments
    if  (g_strv_length(args) != 2)  {
        goto LBL_1;
    }

    if (args && args[0]) {
        *desktop_file = g_strdup(args[0]);

        if (args[1]) {
            *service_name = g_strdup(args[1]);
        }
    }

LBL_1:
    // Delete args
    g_strfreev(args);
}

gchar *get_base_name(gchar *service_name) {
    // Take last part of service_name and return it.
    // Eg. take "vlc" from "org.mpris.MediaPlayer2.vlc"

    // Find last "."
    gchar *pos = g_strrstr0(service_name, ".");
    if (pos) {
        return g_strdup(pos+1);
    }

    return NULL;
}

static void dbus_player_delete_saved(const gchar *service_name) {
    // Delete service_name from GSettings.
    // See dconf-editor, key: /apps/audio-recorder/players/players/saved-player-list
    GList *list = NULL;
    GList *new_list = NULL;

    if (!service_name) return;

    str_trim((gchar*)service_name);

    // Get saved-player-list from GSettings.
    const gchar *conf_key = "players/saved-player-list";
    conf_get_string_list((gchar*)conf_key, &list);

    GList *item = g_list_first(list);
    while (item) {
        // Take values. Eg: "amarok \t org.mpris.MediaPlayer2.amarok"
        gchar *str = (gchar*)item->data;
        gchar *desktop_file = NULL;
        gchar *service = NULL;

        // Split on '\t'
        split_value(str, &desktop_file, &service);

        // Service names match?
        if (!g_strcmp0(service_name, service)) {
            // Drop this node
            ;
        } else {
            // Keep this node
            new_list = g_list_append(new_list, g_strdup(str));
        }

        g_free(desktop_file);
        g_free(service);

        item = g_list_next(item);
    }

    // Save changes to GSettings
    conf_save_string_list((gchar*)conf_key, new_list);

    // Free delete_list
    str_list_free(new_list);
    new_list = NULL;

    // Free list
    str_list_free(list);
    list = NULL;
}

static void dbus_player_save(MediaPlayerRec *pl) {
    // Save pl->app_name/pl->service_name to GSettings.
    // See dconf-editor, key: /apps/audio-recorder/players/players/saved-player-list
    GList *list = NULL;
    if (!pl->service_name) return;

    // Delete old value
    dbus_player_delete_saved(pl->service_name);

    // str must have format "vlc \t org.mpris.MediaPlayer2.vlc"
    gchar *str = g_strdup_printf("%s\t%s", check_null(pl->desktop_file), pl->service_name);

    // Get saved-player-list from Gsettings.
    const gchar *conf_key = "players/saved-player-list";
    conf_get_string_list((gchar*)conf_key, &list);

    // Add new entry and save in GSettings/DConf
    list = g_list_prepend(list, g_strdup(str));
    conf_save_string_list((gchar*)conf_key, list);

#if defined(DEBUG_PLAYER) || defined(DEBUG_ALL)
    LOG_PLAYER("----------------------------\n");
    str_list_print("New, saved saved-player-list", list);
    LOG_PLAYER("----------------------------\n");
#endif

    // Free list
    str_list_free(list);
    list = NULL;
    g_free(str);
}

static void dbus_player_get_saved() {
    // Get saved-player-list from GSettings.
    // See dconf-editor, key: /apps/audio-recorder/players/players/saved-player-list
    const gchar *conf_key = "players/saved-player-list";

    // Get list
    GList *list = NULL;
    conf_get_string_list((gchar*)conf_key, &list);

#if defined(DEBUG_PLAYER) || defined(DEBUG_ALL)
    LOG_PLAYER("----------------------------\n");
    str_list_print("Get saved-player-list", list);
    LOG_PLAYER("----------------------------\n");
#endif

    // Add saved & still existing media-players to the list
    GList *item = g_list_first(list);
    while (item) {
        // Read values. Eg. "vlc \t org.mpris.MediaPlayer2.vlc"
        gchar *str = (gchar*)item->data;
        gchar *desktop_file = NULL;
        gchar *service_name = NULL;

        // Split on '\t'
        split_value(str, &desktop_file, &service_name);

        // We will not tolerate errors here.
        // Wipe out the entire list if one line is bad (eg. it has older format)!
        if (!(desktop_file && service_name)) {
            g_free(desktop_file);
            g_free(service_name);
            conf_save_string_list((gchar*)conf_key, NULL);
            goto LBL_1;
        }

        // Add media-player to the list (to be shown in the "Source:" listbox).
        if (!add_player_to_list(desktop_file, service_name)) {

            // It's probably uninstalled. Delete form GSettings too.
            LOG_PLAYER("Player %s, (%s) removed from the list. It's probably uninstalled.\n",
                       desktop_file, service_name);

            dbus_player_delete_saved(service_name);
        }

        g_free(desktop_file);
        g_free(service_name);

        item = g_list_next(item);
    }

LBL_1: {
        // Free list
        str_list_free(list);
        list = NULL;
    }
}

void get_details_from_desktop_file(MediaPlayerRec *pl, const gchar *desktop_file) {
    // Find AppInfo for the given .desktop file
    // I assume here that .desktop filenames are in ascii (not multibyte) strings

    if (!desktop_file) {
        goto LBL_1;
    }

    gchar *s = NULL;

    // Ends with ".desktop"?
    if (g_str_has_suffix(desktop_file, ".desktop")) {
        s = g_strdup(desktop_file);
    } else {
        // Add ".desktop"
        s = g_strdup_printf("%s.desktop", desktop_file);
    }

    // Get GDesktopAppInfo from propgram.desktop file
    GDesktopAppInfo *app_info = g_desktop_app_info_new(s);

    gchar *found_str = NULL;

    // .desktop file was found?
    if (!G_IS_DESKTOP_APP_INFO(app_info)) {
        // No. Search for it.     

        g_free(s); s = NULL;

        // Find application's basename 
        // Eg. "amarok" of "org.kde.amarok"
        gchar *p = strrchr(desktop_file, '.');

        if (p && (str_length0(p) > 1)) {
            s = g_strdup(p + 1);
        } else {
            s = g_strdup(desktop_file);
        }

        gchar ***results = g_desktop_app_info_search(s);
        // results: gchar *results[][]
        // results is a 2-dim array of gchar* strings, the first (i dimension) contains results (another array) for each search string we passed in (in s).
        // Please see: https://developer.gnome.org/gio/stable/gio-Desktop-file-based-GAppInfo.html#g-desktop-app-info-search
        
        gchar *s2 = g_strdup_printf("%s.desktop", s);

        for (guint i=0; results && results[i] != NULL; i++) { 

            for (guint j=0; results[i][j] != NULL; j++) {
        
                // Some nitpicking here
                gchar *s1_down = g_ascii_strdown(results[i][j], str_length0(results[i][j]));
                gchar *s2_down = g_ascii_strdown(s2, str_length0(s2));

                if (g_strrstr(s1_down, s2_down)) {
                    // Probably safe with utf8 (multibyte)
                    // https://developer.gnome.org/glib/stable/glib-String-Utility-Functions.html#g-strrstr
                    found_str = g_strdup(results[i][j]);
                }

                g_free(s1_down);
                g_free(s2_down);

                if (found_str) {
                    break;
                }

            } // j...

        } // i...

        g_free(s2);
        
        // Free gchar *results[][]
        // Be carefull
        for (guint i=0; results[i] != NULL; i++) {
            g_strfreev(results[i]);
        }      
        g_free(results); 
        results = NULL;

        // Try again      
        if (found_str) {
            // Load AppInfo
            app_info = g_desktop_app_info_new(found_str);
        }            

    }

    g_free(found_str);
    g_free(s);

    // Do we have AppInfo?
    if (!G_IS_DESKTOP_APP_INFO(app_info)) {
        goto LBL_1;
    }

    // Read application title
    const gchar *app_name = g_app_info_get_name(G_APP_INFO(app_info));
    if (!app_name) {
        app_name = g_app_info_get_display_name(G_APP_INFO(app_info));
    }

    pl->app_name = g_strdup(app_name);

    // Read executable command and its arguments
    pl->exec_cmd = g_strdup((gchar*)g_app_info_get_commandline(G_APP_INFO(app_info)));

    pl->icon_name = g_desktop_app_info_get_string(app_info, "Icon");
    if (!pl->icon_name){
        pl->icon_name = g_strdup((gchar *)g_app_info_get_executable(G_APP_INFO(app_info)));    
    }

    g_object_unref(app_info);



    // Remove %U from the exec command.
    // %u, %U in the exec command (.desktop file) is normally replaced by a file argument 
    // Some media players show an error if the file argument is empty
    str_trim(pl->exec_cmd);

    gchar *p = g_strrstr(pl->exec_cmd, "%U");
    if (!p)
        p = g_strrstr(pl->exec_cmd, "%u");

    if (p)
        *p = '\0'; 

LBL_1: {
        // Basename 
        // Eg. take "vlc" from "org.mpris.MediaPlayer2.vlc"
        gchar *base_name = get_base_name(pl->service_name);

        // Make sure these values are set
        if (!pl->app_name) {
            pl->app_name = g_strdup(base_name);
        }

        if (!pl->desktop_file) {
            pl->desktop_file = g_strdup(base_name);
        }

        if (!pl->exec_cmd) {
            pl->exec_cmd = g_strdup(base_name);
        }

        if (!pl->exec_cmd) {
            pl->exec_cmd = g_strdup(base_name);
        }

        if (!pl->icon_name) {
            pl->icon_name = g_strdup(base_name);
        }

        g_free(base_name);

    }
}

void dbus_player_reset_values(gchar *audio_source) {
    // Reset audio_source's internal values (in dbus-player.c module).

    // Get MediaPlayerRec for this audio_source (service name)
    MediaPlayerRec *player = dbus_player_lookup_service_name(audio_source);

    if (!player) {
        return;
    }    

    // Nullify player->prev_track (TrackInfo record).
    // User has stopped recording from the GUI (Button or Menu), 
    // We must clear MediaPlayerRec`s prev_track record.
    // User can later re-start recording from the media-player, and it is not counted as duplicate START_RECORDING message. 
    // This is important for some media players.
    TrackInfo *tr = &player->prev_track;
    memset(tr, '\0', sizeof(TrackInfo));
}