FFmpeg 支持

FFmpeg 是一个完整的跨平台解决方案，用于录制、转换和流式传输音频和视频。

安装 FFmpeg

• 从这里下载 FFmpeg

• ./configure --disable-all --disable-autodetect --disable-podpages --disable-asm --enable-avcodec --enable-avformat --enable-decoders --enable-encoders --enable-demuxers --enable-parsers --enable-protocol='file' --enable-swscale --enable-zlib

• make

• sudo make install

将 FFmpeg 添加到您的项目

• 添加库：FFmpeg（对于 GCC：-lavformat -lavcodec -lavutil -lswscale -lm -lz -lpthread）

使用方法

在 lv_conf.h 中启用 LV_USE_FFMPEG。

请参阅以下示例。

注意，FFmpeg 扩展不使用 LVGL 的文件系统。 您可以直接传递图像或视频的路径，就像在您的操作系统或平台上通常使用的一样。

示例

解码图像

C code  

 GitHub

#include "../../lv_examples.h"
#if LV_BUILD_EXAMPLES
#if LV_USE_FFMPEG


/**
 * Open an 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
#endif

MicroPython code  

 GitHub Simulator

Error encountered while trying to open D:\lv_port_pc_eclipse-release-v8.3\lvgl\examples\libs\ffmpeg\lv_example_ffmpeg_1.py

---

解码视频

C code  

 GitHub

#include "../../lv_examples.h"
#if LV_BUILD_EXAMPLES
#if LV_USE_FFMPEG

/**
 * 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
#endif

MicroPython code  

 GitHub Simulator

Error encountered while trying to open D:\lv_port_pc_eclipse-release-v8.3\lvgl\examples\libs\ffmpeg\lv_example_ffmpeg_2.py

---

API

Enums

enum lv_ffmpeg_player_cmd_t

Values:

enumerator LV_FFMPEG_PLAYER_CMD_START

enumerator LV_FFMPEG_PLAYER_CMD_STOP

enumerator LV_FFMPEG_PLAYER_CMD_PAUSE

enumerator LV_FFMPEG_PLAYER_CMD_RESUME

enumerator _LV_FFMPEG_PLAYER_CMD_LAST

Functions

void lv_ffmpeg_init(void)

Register FFMPEG image decoder

int lv_ffmpeg_get_frame_num(const char *path)

Get the number of frames contained in the file

Parameters

path -- image or video file name

Returns

Number of frames, less than 0 means failed

lv_obj_t *lv_ffmpeg_player_create(lv_obj_t *parent)

Create ffmpeg_player object

Parameters

parent -- pointer to an object, it will be the parent of the new player

Returns

pointer to the created ffmpeg_player

lv_res_t lv_ffmpeg_player_set_src(lv_obj_t *obj, const char *path)

Set the path of the file to be played

Parameters

• obj -- pointer to a ffmpeg_player object

• path -- video file path

Returns

LV_RES_OK: no error; LV_RES_INV: can't get the info.

void lv_ffmpeg_player_set_cmd(lv_obj_t *obj, lv_ffmpeg_player_cmd_t cmd)

Set command control video player

Parameters

• obj -- pointer to a ffmpeg_player object

• cmd -- control commands

void lv_ffmpeg_player_set_auto_restart(lv_obj_t *obj, bool en)

Set the video to automatically replay

Parameters

• obj -- pointer to a ffmpeg_player object

• en -- true: enable the auto restart

Variables

const lv_obj_class_t lv_ffmpeg_player_class

struct lv_ffmpeg_player_t

Public Members

lv_img_t img

lv_timer_t *timer

lv_img_dsc_t imgdsc

bool auto_restart

struct ffmpeg_context_s *ffmpeg_ctx