Merge pull request #62 from darmiel/feat/playlist

feat: .sub playlist plugin

applications/meta/application.fam

@@ -79,5 +79,6 @@ App(
         "multi_converter",
         "flipfrid",
         "subbrute",
+        "sub_playlist",
     ],
 )

applications/playlist/application.fam

@@ -0,0 +1,10 @@
+App(
+    appid="sub_playlist",
+    name=".sub Playlist",
+    apptype=FlipperAppType.PLUGIN,
+    entry_point="playlist_app",
+    cdefines=["APP_PLAYLIST"],
+    requires=["storage", "gui", "dialogs", "subghz"],
+    stack_size=2 * 1024,
+    order=14,
+)

applications/playlist/canvas_helper.c

@@ -0,0 +1,81 @@
+#include <gui/gui.h>
+
+#define WIDTH 128
+#define HEIGHT 64
+
+void draw_centered_boxed_str(Canvas* canvas, int x, int y, int height, int pad, const char* text) {
+    // get width of text
+    int w = canvas_string_width(canvas, text);
+    canvas_draw_rframe(canvas, x, y, w + pad, height, 2);
+    canvas_draw_str_aligned(canvas, x + pad / 2, y + height / 2, AlignLeft, AlignCenter, text);
+}
+
+void draw_corner_aligned(Canvas* canvas, int width, int height, Align horizontal, Align vertical) {
+    canvas_set_color(canvas, ColorBlack);
+    switch(horizontal) {
+    case AlignLeft:
+        switch(vertical) {
+        case AlignTop:
+            canvas_draw_rbox(canvas, 0, 0, width, height, 3);
+            canvas_draw_box(canvas, 0, 0, width, 3);
+            canvas_draw_box(canvas, 0, 0, 3, height);
+            break;
+        case AlignCenter:
+            canvas_draw_rbox(canvas, 0, HEIGHT - height / 2, width, height, 3);
+            canvas_draw_box(canvas, 0, HEIGHT - height / 2, 3, height);
+            break;
+        case AlignBottom:
+            canvas_draw_rbox(canvas, 0, HEIGHT - height, width, height, 3);
+            canvas_draw_box(canvas, 0, HEIGHT - height, 3, height);
+            canvas_draw_box(canvas, 0, HEIGHT - 3, width, 3);
+            break;
+        default:
+            break;
+        }
+        break;
+    case AlignRight:
+        switch(vertical) {
+        case AlignTop:
+            canvas_draw_rbox(canvas, WIDTH - width, 0, width, height, 3);
+            canvas_draw_box(canvas, WIDTH - width, 0, width, 3); // bottom corner
+            canvas_draw_box(canvas, WIDTH - 3, 0, 3, height); // right corner
+            break;
+        case AlignCenter:
+            canvas_draw_rbox(canvas, WIDTH - width, HEIGHT / 2 - height / 2, width, height, 3);
+            canvas_draw_box(canvas, WIDTH - 3, HEIGHT / 2 - height / 2, 3, height); // right corner
+            break;
+        case AlignBottom:
+            canvas_draw_rbox(canvas, WIDTH - width, HEIGHT - height, width, height, 3);
+            canvas_draw_box(canvas, WIDTH - 3, HEIGHT - height, 3, height); // right corner
+            canvas_draw_box(canvas, WIDTH - width, HEIGHT - 3, width, 3); // bottom corner
+            break;
+        default:
+            break;
+        }
+        break;
+    case AlignCenter:
+        switch(vertical) {
+        case AlignTop:
+            canvas_draw_rbox(canvas, WIDTH / 2 - width / 2, 0, width, height, 3);
+            canvas_draw_box(canvas, WIDTH / 2 - width / 2, 0, width, 3); // bottom corner
+            canvas_draw_box(canvas, WIDTH / 2 - 3, 0, 3, height); // right corner
+            break;
+        case AlignCenter:
+            canvas_draw_rbox(
+                canvas, WIDTH / 2 - width / 2, HEIGHT / 2 - height / 2, width, height, 3);
+            canvas_draw_box(
+                canvas, WIDTH / 2 - 3, HEIGHT / 2 - height / 2, 3, height); // right corner
+            break;
+        case AlignBottom:
+            canvas_draw_rbox(canvas, WIDTH / 2 - width / 2, HEIGHT - height, width, height, 3);
+            canvas_draw_box(canvas, WIDTH / 2 - 3, HEIGHT - height, 3, height); // right corner
+            canvas_draw_box(canvas, WIDTH / 2 - width / 2, HEIGHT - 3, width, 3); // bottom corner
+            break;
+        default:
+            break;
+        }
+        break;
+    default:
+        break;
+    }
+}

applications/playlist/canvas_helper.h

@@ -0,0 +1,5 @@
+#include <gui/gui.h>
+
+void draw_centered_boxed_str(Canvas* canvas, int x, int y, int height, int pad, const char* text);
+
+void draw_corner_aligned(Canvas* canvas, int width, int height, Align horizontal, Align vertical);

applications/playlist/playlist.c

@@ -0,0 +1,751 @@
+#include <furi.h>
+
+#include <gui/gui.h>
+#include <input/input.h>
+#include <dialogs/dialogs.h>
+#include <storage/storage.h>
+
+#include <lib/toolbox/path.h>
+#include <assets_icons.h>
+
+#include <flipper_format/flipper_format_i.h>
+#include <applications/subghz/subghz_i.h>
+
+#include "flipper_format_stream.h"
+#include "flipper_format_stream_i.h"
+
+#include <lib/subghz/transmitter.h>
+#include <lib/subghz/protocols/raw.h>
+
+#include "playlist_file.h"
+#include "canvas_helper.h"
+
+#define PLAYLIST_FOLDER "/ext/subplaylist"
+#define PLAYLIST_EXT ".txt"
+#define TAG "Playlist"
+
+#define STATE_NONE 0
+#define STATE_OVERVIEW 1
+#define STATE_SENDING 2
+
+#define WIDTH 128
+#define HEIGHT 64
+
+typedef struct {
+    int current_count; // number of processed files
+    int total_count; // number of items in the playlist
+
+    int playlist_repetitions; // number of times to repeat the whole playlist
+    int current_playlist_repetition; // current playlist repetition
+
+    // last 3 files
+    string_t prev_0_path; // current file
+    string_t prev_1_path; // previous file
+    string_t prev_2_path; // previous previous file
+    string_t prev_3_path; // you get the idea
+
+    int state; // current state
+
+    ViewPort* view_port;
+} DisplayMeta;
+
+typedef struct {
+    FuriThread* thread;
+    Storage* storage;
+    FlipperFormat* format;
+
+    DisplayMeta* meta;
+
+    string_t file_path; // path to the playlist file
+
+    bool ctl_request_exit; // can be set to true if the worker should exit
+    bool ctl_pause; // can be set to true if the worker should pause
+
+    bool is_running; // indicates if the worker is running
+} PlaylistWorker;
+
+typedef struct {
+    FuriMutex* mutex;
+    FuriMessageQueue* input_queue;
+    ViewPort* view_port;
+    Gui* gui;
+
+    DisplayMeta* meta;
+    PlaylistWorker* worker;
+
+    string_t file_path; // Path to the playlist file
+} Playlist;
+
+////////////////////////////////////////////////////////////////////////////////
+
+void meta_set_state(DisplayMeta* meta, int state) {
+    meta->state = state;
+    view_port_update(meta->view_port);
+}
+
+static FuriHalSubGhzPreset str_to_preset(string_t preset) {
+    if(string_cmp_str(preset, "FuriHalSubGhzPresetOok270Async") == 0) {
+        return FuriHalSubGhzPresetOok270Async;
+    }
+    if(string_cmp_str(preset, "FuriHalSubGhzPresetOok650Async") == 0) {
+        return FuriHalSubGhzPresetOok650Async;
+    }
+    if(string_cmp_str(preset, "FuriHalSubGhzPreset2FSKDev238Async") == 0) {
+        return FuriHalSubGhzPreset2FSKDev238Async;
+    }
+    if(string_cmp_str(preset, "FuriHalSubGhzPreset2FSKDev476Async") == 0) {
+        return FuriHalSubGhzPreset2FSKDev476Async;
+    }
+    if(string_cmp_str(preset, "FuriHalSubGhzPresetMSK99_97KbAsync") == 0) {
+        return FuriHalSubGhzPresetMSK99_97KbAsync;
+    }
+    if(string_cmp_str(preset, "FuriHalSubGhzPresetMSK99_97KbAsync") == 0) {
+        return FuriHalSubGhzPresetMSK99_97KbAsync;
+    }
+    return FuriHalSubGhzPresetCustom;
+}
+
+// -4: missing protocol
+// -3: missing preset
+// -2: transmit error
+// -1: error
+// 0: ok
+// 1: resend
+// 2: exited
+static int playlist_worker_process(
+    PlaylistWorker* worker,
+    FlipperFormat* fff_file,
+    FlipperFormat* fff_data,
+    const char* path,
+    string_t preset,
+    string_t protocol) {
+    // actual sending of .sub file
+
+    if(!flipper_format_file_open_existing(fff_file, path)) {
+        FURI_LOG_E(TAG, "  (TX) Failed to open %s", path);
+        return -1;
+    }
+
+    // read frequency or default to 433.92MHz
+    uint32_t frequency = 0;
+    if(!flipper_format_read_uint32(fff_file, "Frequency", &frequency, 1)) {
+        FURI_LOG_W(TAG, "  (TX) Missing Frequency, defaulting to 433.92MHz");
+        frequency = 433920000;
+    }
+    if(!furi_hal_subghz_is_tx_allowed(frequency)) {
+        return -2;
+    }
+
+    // check if preset is present
+    if(!flipper_format_read_string(fff_file, "Preset", preset)) {
+        FURI_LOG_E(TAG, "  (TX) Missing Preset");
+        return -3;
+    }
+
+    // check if protocol is present
+    if(!flipper_format_read_string(fff_file, "Protocol", protocol)) {
+        FURI_LOG_E(TAG, "  (TX) Missing Protocol");
+        return -4;
+    }
+
+    if(!string_cmp_str(protocol, "RAW")) {
+        subghz_protocol_raw_gen_fff_data(fff_data, path);
+    } else {
+        stream_copy_full(
+            flipper_format_get_raw_stream(fff_file), flipper_format_get_raw_stream(fff_data));
+    }
+    flipper_format_free(fff_file);
+
+    // (try to) send file
+    SubGhzEnvironment* environment = subghz_environment_alloc();
+    SubGhzTransmitter* transmitter =
+        subghz_transmitter_alloc_init(environment, string_get_cstr(protocol));
+
+    subghz_transmitter_deserialize(transmitter, fff_data);
+
+    furi_hal_subghz_reset();
+    furi_hal_subghz_load_preset(str_to_preset(preset));
+
+    frequency = furi_hal_subghz_set_frequency_and_path(frequency);
+
+    FURI_LOG_D(TAG, "  (TX) Start sending ...");
+    int status = 0;
+
+    furi_hal_subghz_start_async_tx(subghz_transmitter_yield, transmitter);
+    while(!furi_hal_subghz_is_async_tx_complete()) {
+        if(worker->ctl_request_exit) {
+            FURI_LOG_D(TAG, "    (TX) Requested to exit. Cancelling sending...");
+            status = 2;
+            break;
+        }
+        if(worker->ctl_pause) {
+            FURI_LOG_D(TAG, "    (TX) Requested to pause. Cancelling and resending...");
+            status = 1;
+            break;
+        }
+        furi_delay_ms(50);
+    }
+
+    FURI_LOG_D(TAG, "  (TX) Done sending.");
+
+    furi_hal_subghz_stop_async_tx();
+    furi_hal_subghz_sleep();
+
+    subghz_transmitter_free(transmitter);
+
+    return status;
+}
+
+// true - the worker can continue
+// false - the worker should exit
+static bool playlist_worker_wait_pause(PlaylistWorker* worker) {
+    // wait if paused
+    while(worker->ctl_pause && !worker->ctl_request_exit) {
+        furi_delay_ms(50);
+    }
+    // exit loop if requested to stop
+    if(worker->ctl_request_exit) {
+        FURI_LOG_D(TAG, "Requested to exit. Exiting loop...");
+        return false;
+    }
+    return true;
+}
+
+static bool playlist_worker_play_playlist_once(
+    PlaylistWorker* worker,
+    Storage* storage,
+    FlipperFormat* fff_head,
+    FlipperFormat* fff_data,
+    string_t data,
+    string_t preset,
+    string_t protocol) {
+    //
+    if(!flipper_format_rewind(fff_head)) {
+        FURI_LOG_E(TAG, "Failed to rewind file");
+        return false;
+    }
+    while(flipper_format_read_string(fff_head, "sub", data)) {
+        if(!playlist_worker_wait_pause(worker)) {
+            break;
+        }
+
+        // update state to sending
+        meta_set_state(worker->meta, STATE_SENDING);
+
+        ++worker->meta->current_count;
+        const char* str = string_get_cstr(data);
+
+        // it's not fancy, but it works for now :)
+        string_reset(worker->meta->prev_3_path);
+        string_set_str(worker->meta->prev_3_path, string_get_cstr(worker->meta->prev_2_path));
+        string_reset(worker->meta->prev_2_path);
+        string_set_str(worker->meta->prev_2_path, string_get_cstr(worker->meta->prev_1_path));
+        string_reset(worker->meta->prev_1_path);
+        string_set_str(worker->meta->prev_1_path, string_get_cstr(worker->meta->prev_0_path));
+        string_reset(worker->meta->prev_0_path);
+        string_set_str(worker->meta->prev_0_path, str);
+        view_port_update(worker->meta->view_port);
+
+        for(int i = 0; i < 1; i++) {
+            if(!playlist_worker_wait_pause(worker)) {
+                break;
+            }
+
+            view_port_update(worker->meta->view_port);
+
+            FURI_LOG_D(TAG, "(worker) Sending %s", str);
+
+            FlipperFormat* fff_file = flipper_format_file_alloc(storage);
+
+            int status =
+                playlist_worker_process(worker, fff_file, fff_data, str, preset, protocol);
+
+            // if there was an error, fff_file is not already freed
+            if(status < 0) {
+                flipper_format_free(fff_file);
+            }
+
+            // re-send file is paused mid-send
+            if(status == 1) {
+                i -= 1;
+                // errored, skip to next file
+            } else if(status < 0) {
+                break;
+                // exited, exit loop
+            } else if(status == 2) {
+                return false;
+            }
+        }
+    } // end of loop
+    return true;
+}
+
+static int32_t playlist_worker_thread(void* ctx) {
+    Storage* storage = furi_record_open(RECORD_STORAGE);
+    FlipperFormat* fff_head = flipper_format_file_alloc(storage);
+
+    PlaylistWorker* worker = ctx;
+    if(!flipper_format_file_open_existing(fff_head, string_get_cstr(worker->file_path))) {
+        FURI_LOG_E(TAG, "Failed to open %s", string_get_cstr(worker->file_path));
+        worker->is_running = false;
+
+        furi_record_close(RECORD_STORAGE);
+        flipper_format_free(fff_head);
+        return 0;
+    }
+
+    playlist_worker_wait_pause(worker);
+    FlipperFormat* fff_data = flipper_format_string_alloc();
+
+    string_t data, preset, protocol;
+    string_init(data);
+    string_init(preset);
+    string_init(protocol);
+
+    for(int i = 0; i < MAX(1, worker->meta->playlist_repetitions); i++) {
+        // infinite repetitions if playlist_repetitions is 0
+        if(worker->meta->playlist_repetitions <= 0) {
+            --i;
+        }
+        ++worker->meta->current_playlist_repetition;
+        // send playlist
+        worker->meta->current_count = 0;
+
+        FURI_LOG_D(
+            TAG,
+            "Sending playlist (i %d rep %d b %d)",
+            i,
+            worker->meta->current_playlist_repetition,
+            worker->meta->playlist_repetitions);
+
+        if(!playlist_worker_play_playlist_once(
+               worker, storage, fff_head, fff_data, data, preset, protocol)) {
+            break;
+        }
+    }
+
+    furi_record_close(RECORD_STORAGE);
+    flipper_format_free(fff_head);
+
+    string_clear(data);
+    string_clear(preset);
+    string_clear(protocol);
+
+    flipper_format_free(fff_data);
+
+    FURI_LOG_D(TAG, "Done reading. Read %d data lines.", worker->meta->current_count);
+    worker->is_running = false;
+
+    // update state to overview
+    meta_set_state(worker->meta, STATE_OVERVIEW);
+
+    return 0;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+void playlist_meta_reset(DisplayMeta* instance) {
+    instance->current_count = 0;
+    instance->current_playlist_repetition = 0;
+
+    string_reset(instance->prev_0_path);
+    string_reset(instance->prev_1_path);
+    string_reset(instance->prev_2_path);
+    string_reset(instance->prev_3_path);
+}
+
+DisplayMeta* playlist_meta_alloc() {
+    DisplayMeta* instance = malloc(sizeof(DisplayMeta));
+    string_init(instance->prev_0_path);
+    string_init(instance->prev_1_path);
+    string_init(instance->prev_2_path);
+    string_init(instance->prev_3_path);
+    playlist_meta_reset(instance);
+    instance->state = STATE_NONE;
+    instance->playlist_repetitions = 1;
+    return instance;
+}
+
+void playlist_meta_free(DisplayMeta* instance) {
+    string_clear(instance->prev_0_path);
+    string_clear(instance->prev_1_path);
+    string_clear(instance->prev_2_path);
+    string_clear(instance->prev_3_path);
+    free(instance);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+PlaylistWorker* playlist_worker_alloc(DisplayMeta* meta) {
+    PlaylistWorker* instance = malloc(sizeof(PlaylistWorker));
+
+    instance->thread = furi_thread_alloc();
+    furi_thread_set_name(instance->thread, "PlaylistWorker");
+    furi_thread_set_stack_size(instance->thread, 2048);
+    furi_thread_set_context(instance->thread, instance);
+    furi_thread_set_callback(instance->thread, playlist_worker_thread);
+
+    instance->meta = meta;
+    instance->ctl_pause = true; // require the user to manually start the worker
+
+    string_init(instance->file_path);
+
+    return instance;
+}
+
+void playlist_worker_free(PlaylistWorker* instance) {
+    furi_assert(instance);
+    furi_thread_free(instance->thread);
+    string_clear(instance->file_path);
+    free(instance);
+}
+
+void playlist_worker_stop(PlaylistWorker* worker) {
+    furi_assert(worker);
+    furi_assert(worker->is_running);
+
+    worker->ctl_request_exit = true;
+    furi_thread_join(worker->thread);
+}
+
+bool playlist_worker_running(PlaylistWorker* worker) {
+    furi_assert(worker);
+    return worker->is_running;
+}
+
+void playlist_worker_start(PlaylistWorker* instance, const char* file_path) {
+    furi_assert(instance);
+    furi_assert(!instance->is_running);
+
+    string_set_str(instance->file_path, file_path);
+    instance->is_running = true;
+
+    // reset meta (current/total)
+    playlist_meta_reset(instance->meta);
+
+    FURI_LOG_D(TAG, "Starting thread...");
+    furi_thread_start(instance->thread);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+static void render_callback(Canvas* canvas, void* ctx) {
+    Playlist* app = ctx;
+    furi_check(furi_mutex_acquire(app->mutex, FuriWaitForever) == FuriStatusOk);
+
+    canvas_clear(canvas);
+    canvas_set_color(canvas, ColorBlack);
+    canvas_set_font(canvas, FontSecondary);
+
+    string_t temp_str;
+    string_init(temp_str);
+
+    switch(app->meta->state) {
+    case STATE_NONE:
+        canvas_set_font(canvas, FontPrimary);
+        canvas_draw_str_aligned(
+            canvas, WIDTH / 2, HEIGHT / 2, AlignCenter, AlignCenter, "No playlist loaded");
+        break;
+
+    case STATE_OVERVIEW:
+        // draw file name
+        {
+            path_extract_filename(app->file_path, temp_str, true);
+
+            canvas_set_font(canvas, FontPrimary);
+            draw_centered_boxed_str(canvas, 1, 1, 15, 6, string_get_cstr(temp_str));
+        }
+
+        canvas_set_font(canvas, FontSecondary);
+
+        // draw loaded count
+        {
+            string_printf(temp_str, "%d Items in playlist", app->meta->total_count);
+            canvas_draw_str_aligned(canvas, 1, 19, AlignLeft, AlignTop, string_get_cstr(temp_str));
+
+            if(app->meta->playlist_repetitions <= 0) {
+                string_printf(temp_str, "Repeat: yes", app->meta->playlist_repetitions);
+            } else if(app->meta->playlist_repetitions == 1) {
+                string_printf(temp_str, "Repeat: no", app->meta->playlist_repetitions);
+            } else {
+                string_printf(temp_str, "Repeat: %dx", app->meta->playlist_repetitions);
+            }
+            canvas_draw_str_aligned(canvas, 1, 29, AlignLeft, AlignTop, string_get_cstr(temp_str));
+        }
+
+        // draw buttons
+        draw_corner_aligned(canvas, 40, 15, AlignCenter, AlignBottom);
+
+        canvas_set_color(canvas, ColorWhite);
+        canvas_draw_str_aligned(canvas, WIDTH / 2 - 7, HEIGHT - 11, AlignLeft, AlignTop, "Start");
+        canvas_draw_disc(canvas, WIDTH / 2 - 14, HEIGHT - 8, 3);
+
+        //
+        canvas_set_color(canvas, ColorBlack);
+        draw_corner_aligned(canvas, 20, 15, AlignLeft, AlignBottom);
+
+        canvas_set_color(canvas, ColorWhite);
+        canvas_draw_str_aligned(canvas, 4, HEIGHT - 11, AlignLeft, AlignTop, "R-");
+
+        //
+        canvas_set_color(canvas, ColorBlack);
+        draw_corner_aligned(canvas, 20, 15, AlignRight, AlignBottom);
+        canvas_set_color(canvas, ColorWhite);
+        canvas_draw_str_aligned(canvas, WIDTH - 4, HEIGHT - 11, AlignRight, AlignTop, "R+");
+
+        canvas_set_color(canvas, ColorBlack);
+
+        break;
+    case STATE_SENDING:
+        canvas_set_color(canvas, ColorBlack);
+        if(app->worker->ctl_pause) {
+            canvas_draw_icon(canvas, 2, HEIGHT - 8, &I_ButtonRight_4x7);
+        } else {
+            canvas_draw_box(canvas, 2, HEIGHT - 8, 2, 7);
+            canvas_draw_box(canvas, 5, HEIGHT - 8, 2, 7);
+        }
+
+        // draw progress text
+        {
+            canvas_set_font(canvas, FontSecondary);
+            string_printf(temp_str, "[%d/%d]", app->meta->current_count, app->meta->total_count);
+            canvas_draw_str_aligned(
+                canvas, 11, HEIGHT - 8, AlignLeft, AlignTop, string_get_cstr(temp_str));
+
+            int h = canvas_string_width(canvas, string_get_cstr(temp_str));
+            int xs = 11 + h + 2;
+            int w = WIDTH - xs - 1;
+            canvas_draw_box(canvas, xs, HEIGHT - 5, w, 1);
+
+            float progress = (float)app->meta->current_count / (float)app->meta->total_count;
+            int wp = (int)(progress * w);
+            canvas_draw_box(canvas, xs + wp - 1, HEIGHT - 7, 2, 5);
+        }
+
+        {
+            if(app->meta->playlist_repetitions <= 0) {
+                string_printf(temp_str, "[%d/Inf]", app->meta->current_playlist_repetition);
+            } else {
+                string_printf(
+                    temp_str,
+                    "[%d/%d]",
+                    app->meta->current_playlist_repetition,
+                    app->meta->playlist_repetitions);
+            }
+            canvas_set_color(canvas, ColorBlack);
+            int w = canvas_string_width(canvas, string_get_cstr(temp_str));
+            draw_corner_aligned(canvas, w + 6, 13, AlignRight, AlignTop);
+            canvas_set_color(canvas, ColorWhite);
+            canvas_draw_str_aligned(
+                canvas, WIDTH - 3, 3, AlignRight, AlignTop, string_get_cstr(temp_str));
+        }
+
+        // draw last and current file
+        {
+            canvas_set_color(canvas, ColorBlack);
+            canvas_set_font(canvas, FontSecondary);
+
+            // current
+            if(!string_empty_p(app->meta->prev_0_path)) {
+                path_extract_filename(app->meta->prev_0_path, temp_str, true);
+                int w = canvas_string_width(canvas, string_get_cstr(temp_str));
+                canvas_set_color(canvas, ColorBlack);
+                canvas_draw_rbox(canvas, 1, 1, w + 4, 12, 2);
+                canvas_set_color(canvas, ColorWhite);
+                canvas_draw_str_aligned(
+                    canvas, 3, 3, AlignLeft, AlignTop, string_get_cstr(temp_str));
+            }
+
+            // last 3
+            canvas_set_color(canvas, ColorBlack);
+
+            if(!string_empty_p(app->meta->prev_1_path)) {
+                path_extract_filename(app->meta->prev_1_path, temp_str, true);
+                canvas_draw_str_aligned(
+                    canvas, 3, 15, AlignLeft, AlignTop, string_get_cstr(temp_str));
+            }
+
+            if(!string_empty_p(app->meta->prev_2_path)) {
+                path_extract_filename(app->meta->prev_2_path, temp_str, true);
+                canvas_draw_str_aligned(
+                    canvas, 3, 26, AlignLeft, AlignTop, string_get_cstr(temp_str));
+            }
+
+            if(!string_empty_p(app->meta->prev_3_path)) {
+                path_extract_filename(app->meta->prev_3_path, temp_str, true);
+                canvas_draw_str_aligned(
+                    canvas, 3, 37, AlignLeft, AlignTop, string_get_cstr(temp_str));
+            }
+        }
+        break;
+    }
+
+    string_clear(temp_str);
+    furi_mutex_release(app->mutex);
+}
+
+static void input_callback(InputEvent* event, void* ctx) {
+    Playlist* app = ctx;
+    furi_message_queue_put(app->input_queue, event, 0);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+Playlist* playlist_alloc(DisplayMeta* meta) {
+    Playlist* app = malloc(sizeof(Playlist));
+    string_init(app->file_path);
+    string_set_str(app->file_path, PLAYLIST_FOLDER);
+
+    app->meta = meta;
+    app->worker = NULL;
+
+    app->mutex = furi_mutex_alloc(FuriMutexTypeNormal);
+    app->input_queue = furi_message_queue_alloc(32, sizeof(InputEvent));
+
+    // view port
+    app->view_port = view_port_alloc();
+    view_port_draw_callback_set(app->view_port, render_callback, app);
+    view_port_input_callback_set(app->view_port, input_callback, app);
+
+    // gui
+    app->gui = furi_record_open(RECORD_GUI);
+    gui_add_view_port(app->gui, app->view_port, GuiLayerFullscreen);
+
+    return app;
+}
+
+void playlist_start_worker(Playlist* app, DisplayMeta* meta) {
+    app->worker = playlist_worker_alloc(meta);
+
+    // count playlist items
+    Storage* storage = furi_record_open(RECORD_STORAGE);
+    app->meta->total_count =
+        playlist_count_playlist_items(storage, string_get_cstr(app->file_path));
+    furi_record_close(RECORD_STORAGE);
+
+    // start thread
+    playlist_worker_start(app->worker, string_get_cstr(app->file_path));
+}
+
+void playlist_free(Playlist* app) {
+    string_clear(app->file_path);
+
+    gui_remove_view_port(app->gui, app->view_port);
+    furi_record_close(RECORD_GUI);
+    view_port_free(app->view_port);
+
+    furi_message_queue_free(app->input_queue);
+    furi_mutex_free(app->mutex);
+
+    playlist_meta_free(app->meta);
+
+    free(app);
+}
+
+int32_t playlist_app(void* p) {
+    UNUSED(p);
+
+    // create playlist folder
+    {
+        Storage* storage = furi_record_open(RECORD_STORAGE);
+        if(!storage_simply_mkdir(storage, PLAYLIST_FOLDER)) {
+            FURI_LOG_E(TAG, "Could not create folder %s", PLAYLIST_FOLDER);
+        }
+        furi_record_close(RECORD_STORAGE);
+    }
+
+    // create app
+    DisplayMeta* meta = playlist_meta_alloc();
+    Playlist* app = playlist_alloc(meta);
+    meta->view_port = app->view_port;
+
+    furi_hal_power_suppress_charge_enter();
+
+    // select playlist file
+    {
+        DialogsApp* dialogs = furi_record_open(RECORD_DIALOGS);
+        const bool res = dialog_file_browser_show(
+            dialogs, app->file_path, app->file_path, PLAYLIST_EXT, true, &I_sub1_10px, false);
+        furi_record_close(RECORD_DIALOGS);
+        // check if a file was selected
+        if(!res) {
+            FURI_LOG_E(TAG, "No file selected");
+            goto exit_cleanup;
+        }
+    }
+
+    ////////////////////////////////////////////////////////////////////////////////
+
+    playlist_start_worker(app, meta);
+    meta_set_state(app->meta, STATE_OVERVIEW);
+
+    bool exit_loop = false;
+    InputEvent input;
+    while(1) { // close application if no file was selected
+        furi_check(
+            furi_message_queue_get(app->input_queue, &input, FuriWaitForever) == FuriStatusOk);
+
+        switch(input.key) {
+        case InputKeyLeft:
+            if(app->meta->state == STATE_OVERVIEW) {
+                if(input.type == InputTypeShort && app->meta->playlist_repetitions > 0) {
+                    --app->meta->playlist_repetitions;
+                }
+            }
+            break;
+
+        case InputKeyRight:
+            if(app->meta->state == STATE_OVERVIEW) {
+                if(input.type == InputTypeShort) {
+                    ++app->meta->playlist_repetitions;
+                }
+            }
+            break;
+
+        case InputKeyOk:
+            if(input.type == InputTypeShort) {
+                // toggle pause state
+                if(!app->worker->is_running) {
+                    app->worker->ctl_pause = false;
+                    app->worker->ctl_request_exit = false;
+                    playlist_worker_start(app->worker, string_get_cstr(app->file_path));
+                } else {
+                    app->worker->ctl_pause = !app->worker->ctl_pause;
+                }
+            }
+            break;
+        case InputKeyBack:
+            FURI_LOG_D(TAG, "Pressed Back button. Application will exit");
+            exit_loop = true;
+            break;
+        default:
+            break;
+        }
+
+        furi_mutex_release(app->mutex);
+
+        // exit application
+        if(exit_loop == true) {
+            break;
+        }
+
+        view_port_update(app->view_port);
+    }
+
+exit_cleanup:
+
+    furi_hal_power_suppress_charge_exit();
+
+    if(app->worker != NULL) {
+        if(playlist_worker_running(app->worker)) {
+            FURI_LOG_D(TAG, "Thread is still running. Requesting thread to finish ...");
+            playlist_worker_stop(app->worker);
+        }
+        FURI_LOG_D(TAG, "Freeing Worker ...");
+        playlist_worker_free(app->worker);
+    }
+
+    FURI_LOG_D(TAG, "Freeing Playlist ...");
+    playlist_free(app);
+    return 0;
+}

applications/playlist/playlist_file.c

@@ -0,0 +1,20 @@
+#include <furi.h>
+
+#include <storage/storage.h>
+#include <flipper_format/flipper_format_i.h>
+
+int playlist_count_playlist_items(Storage* storage, const char* file_path) {
+    FlipperFormat* format = flipper_format_file_alloc(storage);
+    if(!flipper_format_file_open_existing(format, file_path)) {
+        return -1;
+    }
+    int count = 0;
+    string_t data;
+    string_init(data);
+    while(flipper_format_read_string(format, "sub", data)) {
+        ++count;
+    }
+    flipper_format_file_close(format);
+    string_clear(data);
+    return count;
+}

applications/playlist/playlist_file.h

@@ -0,0 +1,7 @@
+#pragma once
+
+#include <furi.h>
+
+#include <storage/storage.h>
+
+int playlist_count_playlist_items(Storage* storage, const char* file_path);