feat(lib) add ffmpeg video and image decoder (#2805)

* add ffmpeg decoder to extra/libs

* fix(Kconfig) add ffmpeg configuration

Signed-off-by: pengyiqiang <pengyiqiang@xiaomi.com>

* feat(example) add ffmpeg decoder example

Signed-off-by: pengyiqiang <pengyiqiang@xiaomi.com>

* update lv_conf_template.h

* feat(example) add picture and video to ffmpeg example

* docs(libs) update FFMpeg introduction

Signed-off-by: pengyiqiang <pengyiqiang@xiaomi.com>

* fix(ffmpeg) replace with new videos and examples

Signed-off-by: pengyiqiang <pengyiqiang@xiaomi.com>

* fix(ffmpeg) remove the include of lv_img_cache.h

* fix(ffmpeg) add LV_ASSERT_OBJ

* Update examples/libs/ffmpeg/lv_example_ffmpeg_2.c

Co-authored-by: pengyiqiang <pengyiqiang@xiaomi.com>
Co-authored-by: Gabor Kiss-Vamosi <kisvegabor@gmail.com>

examples/libs/ffmpeg/lv_example_ffmpeg.h

@@ -0,0 +1,39 @@
+/**
+ * @file lv_example_ffmpeg.h
+ *
+ */
+
+#ifndef LV_EXAMPLE_FFMPEG_H
+#define LV_EXAMPLE_FFMPEG_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+void lv_example_ffmpeg_1(void);
+void lv_example_ffmpeg_2(void);
+
+/**********************
+ *      MACROS
+ **********************/
+
+#ifdef __cplusplus
+} /*extern "C"*/
+#endif
+
+#endif /*LV_EXAMPLE_FFMPEG_H*/

examples/libs/ffmpeg/lv_example_ffmpeg_1.c

@@ -0,0 +1,26 @@
+#include "../../lv_examples.h"
+#if LV_USE_FFMPEG && LV_BUILD_EXAMPLES
+
+/**
+ * Open a image from a file
+ */
+void lv_example_ffmpeg_1(void)
+{
+    lv_obj_t * img = lv_img_create(lv_scr_act());
+    lv_img_set_src(img, "./lvgl/examples/libs/ffmpeg/ffmpeg.png");
+    lv_obj_center(img);
+}
+
+#else
+
+void lv_example_ffmpeg_1(void)
+{
+    /*TODO
+     *fallback for online examples*/
+
+    lv_obj_t * label = lv_label_create(lv_scr_act());
+    lv_label_set_text(label, "FFmpeg is not installed");
+    lv_obj_center(label);
+}
+
+#endif

examples/libs/ffmpeg/lv_example_ffmpeg_2.c

@@ -0,0 +1,30 @@
+#include "../../lv_examples.h"
+#if LV_USE_FFMPEG && LV_BUILD_EXAMPLES
+
+/**
+ * Open a video from a file
+ */
+void lv_example_ffmpeg_2(void)
+{
+    /*birds.mp4 is downloaded from http://www.videezy.com (Free Stock Footage by Videezy!)
+     *https://www.videezy.com/abstract/44864-silhouettes-of-birds-over-the-sunset*/
+    lv_obj_t * player = lv_ffmpeg_player_create(lv_scr_act());
+    lv_ffmpeg_player_set_src(player, "./lvgl/examples/libs/ffmpeg/birds.mp4");
+    lv_ffmpeg_player_set_auto_restart(player, true);
+    lv_ffmpeg_player_set_cmd(player, LV_FFMPEG_PLAYER_CMD_START);
+    lv_obj_center(player);
+}
+
+#else
+
+void lv_example_ffmpeg_2(void)
+{
+    /*TODO
+     *fallback for online examples*/
+
+    lv_obj_t * label = lv_label_create(lv_scr_act());
+    lv_label_set_text(label, "FFmpeg is not installed");
+    lv_obj_center(label);
+}
+
+#endif