lv_ffmpeg学习及播放rtsp

lvgl8.3有ffmpeg支持

FFmpeg support

typedef struct {lv_img_t img;lv_timer_t * timer;lv_img_dsc_t imgdsc;bool auto_restart;struct ffmpeg_context_s * ffmpeg_ctx;
} lv_ffmpeg_player_t;typedef enum {LV_FFMPEG_PLAYER_CMD_START,LV_FFMPEG_PLAYER_CMD_STOP,LV_FFMPEG_PLAYER_CMD_PAUSE,LV_FFMPEG_PLAYER_CMD_RESUME,_LV_FFMPEG_PLAYER_CMD_LAST
} lv_ffmpeg_player_cmd_t;struct ffmpeg_context_s {AVFormatContext * fmt_ctx;AVCodecContext * video_dec_ctx;AVStream * video_stream;uint8_t * video_src_data[4];uint8_t * video_dst_data[4];struct SwsContext * sws_ctx;AVFrame * frame;AVPacket pkt;int video_stream_idx;int video_src_linesize[4];int video_dst_linesize[4];enum AVPixelFormat video_dst_pix_fmt;bool has_alpha;
};

1. `lv_ffmpeg_player_create` 调用构造函数创建播放器


//构造函数
lv_ffmpeg_player_constructor
{
// 主要创建用于刷新图像的定时器
player->timer = lv_timer_create(lv_ffmpeg_player_frame_update_cb,FRAME_DEF_REFR_PERIOD, obj);
}

2.`lv_ffmpeg_player_set_src(player, "/userdata/lvgl_app/birds.mp4");`

2.1 打开给定视频文件

    //打开文件, 寻找视频流及对应解码器 设置最终像素格式等参数player->ffmpeg_ctx = ffmpeg_open_file(path);//根据获得的视频流信息申请图像空间及ffmpeg需要的frame pktif(ffmpeg_image_allocate(player->ffmpeg_ctx) < 0) //将ffmpeg解码数据与lvgl图片刷新区域相关联player->imgdsc.data = ffmpeg_get_img_data(player->ffmpeg_ctx);lv_img_set_src(&player->img.obj, &(player->imgdsc));

3. `lv_ffmpeg_player_set_cmd(player, LV_FFMPEG_PLAYER_CMD_START);`开始播放

            //重新启动图像刷新定时器lv_timer_resume(timer);构造函数中创建// 主要创建用于刷新图像的定时器player->timer = lv_timer_create(lv_ffmpeg_player_frame_update_cb,FRAME_DEF_REFR_PERIOD, obj);

4.简单修改，实现播放rtsp流

    lv_obj_t * player = lv_ffmpeg_player_create(lv_scr_act());//lv_ffmpeg_player_set_src(player, "/userdata/lvgl_app/birds.mp4");lv_ffmpeg_player_set_src(player, "rtsp://admin:p@ssw0rd@192.168.51.210/h264/ch33/main/av_stream");//lv_ffmpeg_player_set_auto_restart(player, true);lv_ffmpeg_player_set_cmd(player, LV_FFMPEG_PLAYER_CMD_START);lv_obj_center(player);

4.1 关闭所有暂停及seek操作

            av_seek_frame(player->ffmpeg_ctx->fmt_ctx,0, 0, AVSEEK_FLAG_BACKWARD);lv_timer_pause(player->timer);

4.1 网络初始化

avformat_network_init();

4.2 设置帧率

lv_res_t lv_ffmpeg_player_set_src(lv_obj_t * obj, const char * path)
{if(period > 0) {LV_LOG_INFO("frame refresh period = %d ms, rate = %d fps",period, 1000 / period);lv_timer_set_period(player->timer, period);}else {LV_LOG_WARN("unable to get frame refresh period");
#if rtsplv_timer_set_period(player->timer, (1/25)*1000);
#endif}}

4.3 设置参数

struct ffmpeg_context_s * ffmpeg_open_file(const char * path){//3.设置打开媒体文件的相关参数AVDictionary *options = NULL;av_dict_set(&options, "buffer_size", "6M", 0); // 设置 buffer_size 为 2MB//以tcp方式打开,如果以udp方式打开将tcp替换为udpav_dict_set(&options, "rtsp_transport", "tcp", 0);//设置超时断开连接时间,单位微秒,3000000表示3秒av_dict_set(&options, "stimeout", "1000000", 0);//设置最大时延,单位微秒,1000000表示1秒av_dict_set(&options, "max_delay", "1000000", 0);//自动开启线程数av_dict_set(&options, "threads", "auto", 0);// 设置分析持续时间//av_dict_set(&options, "analyzeduration", "1000000", 0);// 设置探测大小av_dict_set(&options, "probesize", "5000000", 0);if(avformat_open_input(&(ffmpeg_ctx->fmt_ctx), path, NULL, &options) < 0) {LV_LOG_ERROR("Could not open source file %s", path);goto failed;}//修改解码帧颜色格式ffmpeg_ctx->video_dst_pix_fmt = AV_PIX_FMT_RGBA ;
}