设计目标：
1 实现基本的音乐播放器功能
2 显示播放列表
3 实现进度条控制音乐
4 歌词显示
功能描述：
列表选歌
播放暂停，快进快退，上下切歌
设置播放模式，播放速度
调节音量、进度条
设计方案：
多线程、互斥锁、条件变量、信号
界面效果:
源码
#include "lvgl/examples/lv_examples.h"
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <stdio.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>
#include<time.h>
#include <semaphore.h>
extern pthread_mutex_t mutex_lv;//lvgl线程锁
static char local_music_path[]="/root/player/music";//音乐路径
static char local_pic_path[]="/root/player/picture";//图片路径
static char local_words_path[]="/root/player/words";//歌词路径
static char music_path[100][1024];//音乐路径
static char pic_path[100][1024];//图片路径
static char words_path[100][1024];//歌词路径
static char words_buf[5*1024]={0}; //放歌词的数组
static FILE *fp_mplayer=NULL; //播放器传回的管道，接收播放进度
static FILE *fp_words=NULL; //歌词文件
static int fd_mplayer = 0; //定义管道文件描述符,发送指令给mplayer
static int music_num=0; //音乐数量
static int music_index=-1; //当前音乐的下标值，用于寻找上下首
static int percent_pos; //当前播放百分比
static float time_length; //歌曲长度
static float time_pos; //当前播放进度
static bool list_flag=1; //开关列表
static bool words_flag=1; //歌词列表
static bool play_flag=0; //播放音乐开关
static bool start=0; //启动，线程读mplayer返回信息
static lv_style_t font_style; //中文
static lv_obj_t *play_mode; //下拉列表对象，播放模式
static lv_obj_t *speed_obj; //下拉列表对象，播放速度
static lv_obj_t * music_list; //列表对象
static lv_obj_t *pic_obj; //图片对象
static lv_obj_t * volume_slider; //音量滑条对象
static lv_obj_t * play_slider; //播放进度条对象
static lv_obj_t *title_label; //图片信息标签
static lv_obj_t *words_label; //歌词标签
static lv_obj_t * volume_label; //音量标签
static lv_obj_t *time_length_label; //时长标签
static lv_obj_t *time_pos_label; //当前时间标签
static lv_obj_t *words_list; //歌词标签
pthread_cond_t cond; //条件变量，用于暂停读取mplayer
pthread_cond_t cond1;
pthread_mutex_t mutex;
pthread_mutex_t mutex1;
pthread_t tid_read; //读mplayer的线程id
pthread_t tid_write; //写mplayer的线程id
//检索本地歌单
void get_music_path()
{
//读目录,mp3后缀保存到数组
DIR *dirp = opendir(local_music_path);
if(dirp==NULL)
{
perror(local_music_path);
exit(0);
}
struct dirent* msg;
while(1)
{
msg = readdir(dirp);
if(msg == NULL)break;
if(msg->d_name[0]=='.')continue;
if(strstr(msg->d_name,".mp3"))
{
sprintf(music_path[music_num], "%s/%s", local_music_path, msg->d_name);
//拼接图片与歌词路径↓
char name[100]={0};
strcpy(name,strtok(msg->d_name,"."));
sprintf(pic_path[music_num], "S:%s/%s.jpg", local_pic_path, name);
sprintf(words_path[music_num], "%s/%s.lrc", local_words_path, name);
//拼接图片与歌词路径↑
music_num++;
puts(music_path[music_num - 1]);
}
}
printf("检索歌单完成 共%d\n",music_num);
}
//检索本地图片
void get_pic_path()
{
//读目录,图片后缀保存到数组
DIR *dirp = opendir(local_pic_path);
if(dirp==NULL)
{
perror(local_pic_path);
return;
}
struct dirent* msg;
int pic_num=0;
while(1)
{
msg = readdir(dirp);
if(msg == NULL)break;
if(msg->d_name[0]=='.')continue;
if(strstr(msg->d_name,".png")||strstr(msg->d_name,".jpg"))
{
sprintf(pic_path[pic_num++], "S:%s/%s", local_pic_path, msg->d_name);
puts(pic_path[pic_num - 1]);
}
}
printf("检索图片完成 共%d\n",pic_num);
}
//检索歌词
void get_words_paht()
{
//读目录,lrc后缀保存到数组
DIR *dirp = opendir(local_words_path);
if(dirp==NULL)
{
perror(local_words_path);
return;
}
struct dirent* msg;
int words_num=0;
while(1)
{
msg = readdir(dirp);
if(msg == NULL)break;
if(msg->d_name[0]=='.')continue;
if(strstr(msg->d_name,".lrc"))
{
sprintf(words_path[words_num++], "%s/%s", local_words_path, msg->d_name);
puts(words_path[words_num - 1]);
}
}
printf("检索歌词完成 共%d\n",words_num);
}
//初始化字体风格
void init_font_style()
{
/*创建字体*/
static lv_ft_info_t info;
info.name = "/font/simhei.ttf";//字体位置
info.weight = 18;//大小
info.style = FT_FONT_STYLE_NORMAL;//风格
info.mem = NULL;
if(!lv_ft_font_init(&info)) {
LV_LOG_ERROR("create failed.");
}
/*给字体设置样式*/
lv_style_init(&font_style);
lv_style_set_text_font(&font_style, info.font);
lv_style_set_text_align(&font_style, LV_TEXT_ALIGN_CENTER);
//lv_obj_add_style(label, &style, 0);
}
//初始化图片的父对象，即图片都在这个对象中显示
void init_pic_parent_obj()
{
//在屏幕中创建一个对象
lv_obj_t * img = lv_obj_create(lv_scr_act());
//取消滚动
lv_obj_clear_flag(img, LV_OBJ_FLAG_SCROLLABLE);
lv_obj_set_size(img, 200, 200);
lv_obj_align(img, LV_ALIGN_CENTER, 0, -60);
// lv_obj_set_style_pad_all
//图片对象
pic_obj = lv_img_create(img);
lv_obj_center(pic_obj);
}
//初始化歌曲信息的父对象
void init_title_obj()
{
//在屏幕中创建一个对象
lv_obj_t * title = lv_obj_create(lv_scr_act());
lv_obj_clear_flag(title, LV_OBJ_FLAG_SCROLLABLE);//禁用滚动
lv_obj_set_size(title, 200, 50);
lv_obj_align(title, LV_ALIGN_TOP_MID, 0, 20);
//标题标签
title_label = lv_label_create(title);
//添加字体
lv_obj_add_style(title_label, &font_style, 0);
lv_obj_center(title_label);
lv_label_set_text(title_label, "开启音乐之旅");
//歌词标签
words_label = lv_label_create(lv_scr_act());
lv_obj_add_style(words_label, &font_style, 0);
lv_obj_align(words_label,LV_ALIGN_CENTER,0,70);
lv_label_set_text(words_label,"歌词");
}
//信号任务
void signal_10_task(int arg)
{
if (arg == 10)
{
printf("收到信号 %d 线程任务(读取mplayer)暂停\n", arg);
pthread_kill(tid_write,12); //停止写
pthread_cond_wait(&cond, &mutex); //停止读
pthread_cond_signal(&cond1);//唤醒获取时间
puts("继续工作,读mplayer");
return;
}
}
void signal_12_task(int arg)
{
//printf("收到信号 %d\n",arg);
printf("收到信号 %d 线程任务(get_time_pos)暂停\n", arg);
pthread_cond_wait(&cond1, &mutex1);
puts("继续工作,写mplayer");
return;
}
static char words_line[1024]={0};
//找歌词
void *find_words_task(void *arg)
{
char *p=strstr(words_buf,(char *)arg);//寻找这个时间有没有歌词
if(p!=NULL) //和歌词相同时间
{
char buf[1024]={0};
sscanf(p,"%s",buf);
char *q = strrchr(buf,']');
sscanf(++q,"%s",buf);
if(strcmp(buf,words_line))//不相同
{
strcpy(words_line,buf);
puts(words_line);
//**********歌词标签
//lv_label_set_text(words_label,words_line);
pthread_mutex_lock(&mutex_lv);//上锁
lv_label_set_text(words_label,words_line);
pthread_mutex_unlock(&mutex_lv);
}
}
}
//线程任务 读播放器返回内容
static char show_time_buf[100]={0};
void *read_mplayer_task(void *arg)
{
//注册一个信号
signal(10, signal_10_task);//收到10就暂停
char line[1024]={0}; //返回信息
char *p;
while(1)
{
memset(line,0,1024);
fgets(line,1024,fp_mplayer); //读取进程返回的内容
//printf("RETURN %s",line);
if(strstr(line,"ANS_TIME_POSITION"))//当前播放秒数
{
p=strrchr(line,'=');p++;
sscanf(p,"%f",&time_pos);
//printf("歌曲播放时间 %.2f\n",time_pos);
char tmp[100]={0};
int tmp_time=time_pos;
sprintf(tmp,"%02d:%02d",tmp_time/60,tmp_time % 60);
if(strcmp(show_time_buf,tmp))//不相同
{
strcpy(show_time_buf,tmp);
//lv_label_set_text(time_pos_label,show_time_buf); //设置标签
pthread_mutex_lock(&mutex_lv);//上锁
lv_label_set_text(time_pos_label,show_time_buf);
pthread_mutex_unlock(&mutex_lv);
}
puts(tmp);//打印时间 00:00
//*********开启线程找歌词**********//
pthread_t tid;
pthread_create(&tid,NULL,find_words_task,tmp);
pthread_detach(tid);
//*******************//
}
if(strstr(line,"ANS_PERCENT_POSITION"))//播放百分比
{
p=strrchr(line,'=');//p++;
int percent=0;
sscanf(++p,"%d",&percent);
//printf("播放百分比 %d\n",percent_pos);
if(percent!=percent_pos)
{
percent_pos=percent;
//lv_slider_set_value(play_slider,percent_pos,LV_ANIM_OFF);//设置进度条值
pthread_mutex_lock(&mutex_lv);//上锁
lv_slider_set_value(play_slider,percent_pos,LV_ANIM_OFF);
pthread_mutex_unlock(&mutex_lv);
}
if(percent_pos>=99)//播完了
{
lv_label_set_text(time_pos_label,"0:00");
//播放模式
int mod = lv_dropdown_get_selected(play_mode);
switch (mod)
{case 0:{pthread_kill(tid_read,10);//停止读写mplayer
break;}
case 1://循环播放
break;
case 2://列表循环
{
if(++music_index >= music_num)music_index=0;
play_one_music();
break;
}
case 3://随机播放
{
srand((unsigned)time(NULL));
music_index = (music_index+rand())%music_num;
play_one_music();
break;
}
default:
break;
}
}
}
if(strstr(line,"ANS_LENGTH"))//歌曲长度
{
p=strrchr(line,'=');p++;
sscanf(p,"%f",&time_length);
printf("歌曲长度 %.2f\n",time_length);
char time_buf[100]={0};
int length=time_length;
sprintf(time_buf,"%02d:%02d",length/60,length % 60);
puts(time_buf);
pthread_mutex_lock(&mutex_lv);//上锁
lv_label_set_text(time_length_label,time_buf); //设置标签
pthread_mutex_unlock(&mutex_lv);
}
}
}
//线程任务 发送命令给mplayer
void *write_mplayer_task(void *arg)
{
//注册一个信号
signal(12, signal_12_task);//收到12就暂停
char cmd1[1024]="get_time_pos\n";
char cmd[1024]="get_percent_pos\n";
while(1)
{
write(fd_mplayer,cmd1,strlen(cmd1));//发送获取时间命令
usleep(400*1000);
write(fd_mplayer,cmd,strlen(cmd));//发送获取百分比
usleep(400*1000);
//sleep(1);
}
}
//线程任务 创建子进程播放音乐
void *play_music_task(void *arg)
{
//printf("---- %ld线程任务------------------\n",pthread_self());
//拼接命令
char cmd[1024]="mplayer -slave -quiet -input file=/pipe";
sprintf(cmd,"%s %s",cmd,music_path[music_index]);
//puts(cmd);
//播放音乐
fp_mplayer = popen(cmd, "r");
if (fp_mplayer == NULL)perror("popen fail:");
puts("----线程任务(启动播放音乐)完成 -----------------------\n");
strcpy(cmd,"get_time_length\n"); //获取长度
write(fd_mplayer,cmd,strlen(cmd));
strcpy(cmd,"get_time_pos\n"); //发送获取时间命令
write(fd_mplayer,cmd,strlen(cmd));
pthread_exit(NULL);//线程结束
}
//播放一首音乐
void play_one_music()
{
if(play_flag!=0)//有进程在使用播放器
system("killall -9 mplayer");
play_flag=1;
//printf("music_index %d\n", music_index);
//开启线程播放这首歌曲
pthread_t tid;
pthread_create(&tid,NULL,play_music_task,NULL);
pthread_detach(tid);//分离属性，自动回收
if(!start){//第一次才开启
usleep(1000);//等待启动播放器
//开启一个线程读取mplayer返回的内容
//pthread_t tid_read;
pthread_create(&tid_read,NULL,read_mplayer_task,NULL);
pthread_detach(tid_read);//分离属性，自动回收
//开启一个线程发送获取时间命令
pthread_create(&tid_write,NULL,write_mplayer_task,NULL);
pthread_detach(tid_write);//分离属性，自动回收
printf("tid_read %ld tid_write %ld\n",tid_read,tid_write);
start=1;
}
pthread_cond_signal(&cond);//唤醒线程读取mplayer返回的内容
//***********************************************************//
//显示音乐信息
char tmp[100]={0};
char *p = strrchr(music_path[music_index],'/');
strcpy(tmp,++p);
lv_label_set_text(title_label,strtok(tmp,"."));
lv_label_set_text(words_label,strtok(tmp,"."));
//显示音乐图片
lv_img_set_src(pic_obj,pic_path[music_index]);
//打开歌词文件
FILE *fp = fopen(words_path[music_index],"r");
memset(words_buf,0,sizeof(words_buf));
if(fp!=NULL)fread(words_buf,5*1024,1,fp);
fclose(fp);
//lv_label_set_text(words_list,words_buf);
//设置播放属性
int ret = lv_dropdown_get_selected(speed_obj);
//音量
int volume=(int)lv_slider_get_value(volume_slider);
char cmd[1024]={0};
sprintf(cmd,"volume %d 1\n",volume);
write(fd_mplayer,cmd,strlen(cmd));
//修改播放速度
switch (ret)
{
case 0:{char cmd[1024]={"speed_set 1\n"};write(fd_mplayer,cmd,strlen(cmd));break;}
case 1:
{ char cmd[1024]={"speed_set 1.25\n"}; write(fd_mplayer,cmd,strlen(cmd)); break; }
case 2:
{ char cmd[1024]={"speed_set 1.5\n"}; write(fd_mplayer,cmd,strlen(cmd)); break; }
case 3:
{ char cmd[1024]={"speed_set 2\n"}; write(fd_mplayer,cmd,strlen(cmd)); break;
}
default: break;
}
//播放模式
int mod = lv_dropdown_get_selected(play_mode);
switch (mod)
{
case 0:{char cmd[1024]={"loop -1\n"};write(fd_mplayer,cmd,strlen(cmd));break;}
case 1:
{ char cmd[1024]={"loop -1\n"};write(fd_mplayer,cmd,strlen(cmd));
strcpy(cmd,"loop 1\n");write(fd_mplayer,cmd,strlen(cmd)); break;}
case 2://列表循环
{ break; }
case 3://随机播放
{ break;
}
default: break;
}
}
//列表处理函数,播放列表中的音乐
static lv_event_cb_t event_handler_music_list(lv_event_t * e)
{
//获取事件码
lv_event_code_t code = lv_event_get_code(e);
//获取事件对象,这里是按钮
lv_obj_t * obj = lv_event_get_target(e);
//如果点击按钮
if(code == LV_EVENT_CLICKED)
{
//打印按钮中的文本
//LV_LOG_USER("Clicked: %s", lv_list_get_btn_text(music_list, obj));
printf("Clicked %s\n", lv_list_get_btn_text(music_list, obj));
//当前播放中的音乐下标更新为点击列表的下标
music_index = lv_event_get_user_data(e);
play_one_music();
}
}
//显示歌单列表
static void show_list()
{
/*创建列表*/
music_list = lv_list_create(lv_scr_act());
//添加风格
lv_obj_add_style(music_list, &font_style, 0);
lv_obj_set_size(music_list, 180, 300);
//列表位置
//lv_obj_center(music_list);
lv_obj_align(music_list, LV_ALIGN_RIGHT_MID, -20, -80);
//添加文本
lv_list_add_text(music_list, "音乐列表");
/*在列表中添加按钮*/
lv_obj_t * btn;
for(int i = 0; i < music_num; i++)
{
char tmp[100]={0};
char *p = music_path[i];
p = strrchr(p,'/');
strcpy(tmp,++p);//裁剪到只剩音乐名字 music.mp3
//参数：列表对象，图标宏，按钮名
btn = lv_list_add_btn(music_list, NULL,strtok(tmp,"."));
//列表按钮风格
lv_obj_add_style(music_list, &font_style, 0);
//触发事件，把下标传递
lv_obj_add_event_cb(btn, event_handler_music_list, LV_EVENT_CLICKED, i);
}
}
//按钮事件
static void btn_handler(lv_event_t * e)
{
lv_event_code_t code = lv_event_get_code(e);
//获取传递的参数
char *msg = lv_event_get_user_data(e);
if(code == LV_EVENT_CLICKED) //点击按钮
{
if(strcmp(msg,"pause") == 0)
{
if(!start)return;
pthread_kill(tid_read,10);//暂停读mplayer返回内容
system("killall -19 mplayer");
}
if(strcmp(msg,"play") == 0)
{
if(!start)return;
system("killall -18 mplayer");//播放器继续
pthread_cond_signal(&cond);//唤醒读写mplayer
usleep(1000);
pthread_cond_signal(&cond);//防止被再次暂停
}
if(strcmp(msg,"forward") == 0)
{
if(!start)return;
usleep(1000);
char cmd[1024]={"seek +10\n"};
write(fd_mplayer,cmd,strlen(cmd));
strcpy(cmd,"get_percent_pos\n");
write(fd_mplayer,cmd,strlen(cmd));//发送获取时间命令
}
if(strcmp(msg,"back") == 0)
{
if(!start)return;
usleep(10000);
char cmd[1024]={"seek -10\n"};
write(fd_mplayer,cmd,strlen(cmd));
strcpy(cmd,"get_percent_pos\n");
write(fd_mplayer,cmd,strlen(cmd));//发送获取时间命令
}
if(strcmp(msg,"next_music") == 0)
{
usleep(1000);
//播放模式
int mod = lv_dropdown_get_selected(play_mode);
switch (mod)
{
case 1:
{
play_one_music();break;
}
case 0:
case 2://列表循环
{
if(++music_index >= music_num)music_index=0;
play_one_music();
break;
}
case 3://随机播放
{
srand((unsigned)time(NULL));
music_index = (music_index+rand())%music_num;
printf("music_index %d\n",music_index);
play_one_music();
break;
}
default:
break;
}
}
if(strcmp(msg,"prev_music") == 0)
{
usleep(1000);
//播放模式
int mod = lv_dropdown_get_selected(play_mode);
switch (mod)
{
case 1://循环播放
{ char cmd[1024]={"loop -1\n"};write(fd_mplayer,cmd,strlen(cmd));
strcpy(cmd,"loop 1\n");write(fd_mplayer,cmd,strlen(cmd));play_one_music();break;}
case 0://单曲
case 2://列表循环
{
if(--music_index <= 0)music_index=music_num-1;
play_one_music();
break;
}
case 3://随机播放
{
srand((unsigned)time(NULL));
music_index = (music_index+rand())%music_num;
play_one_music();
break;
}
default:
break;
}
}
if(strcmp(msg,"show_list") == 0)
{
list_flag=!list_flag;
if(list_flag)
lv_obj_clear_flag(music_list,LV_OBJ_FLAG_HIDDEN);
else
lv_obj_add_flag(music_list, LV_OBJ_FLAG_HIDDEN);
}
}
}
//显示按钮
void show_button()
{
//风格设置
static lv_style_t btn_style;
lv_style_init(&btn_style);
/*Set a background color and a radius*/
lv_style_set_radius(&btn_style,90);
lv_style_set_bg_opa(&btn_style, LV_OPA_COVER);
lv_style_set_bg_color(&btn_style, lv_palette_lighten(LV_PALETTE_BLUE, 1));//按钮色
/*Add a shadow*/
lv_style_set_shadow_width(&btn_style, 55);
lv_style_set_shadow_color(&btn_style, lv_palette_main(LV_PALETTE_BLUE));//背景色
//按钮的标签
lv_obj_t* label;
//暂停按钮
lv_obj_t *btn_pause = lv_btn_create(lv_scr_act());
//按钮事件
lv_obj_add_event_cb(btn_pause, btn_handler, LV_EVENT_ALL,"pause");
//位置
lv_obj_align(btn_pause, LV_ALIGN_BOTTOM_MID,40,-20);
//大小
lv_obj_set_size(btn_pause,60,60);
//图标
lv_obj_set_style_bg_img_src(btn_pause,LV_SYMBOL_PAUSE,0);
//添加风格
lv_obj_add_style(btn_pause,&btn_style,0);
//播放按钮
lv_obj_t *btn_play = lv_btn_create(lv_scr_act());
lv_obj_add_event_cb(btn_play, btn_handler, LV_EVENT_ALL,"play");
lv_obj_align(btn_play, LV_ALIGN_BOTTOM_MID,-40,-20);
lv_obj_set_size(btn_play,60,60);
lv_obj_set_style_bg_img_src(btn_play,LV_SYMBOL_PLAY,0);
lv_obj_add_style(btn_play,&btn_style,0);
//快进
lv_obj_t *btn_forward = lv_btn_create(lv_scr_act());
lv_obj_add_event_cb(btn_forward, btn_handler, LV_EVENT_ALL,"forward");
lv_obj_set_size(btn_forward,60,60);
lv_obj_align(btn_forward, LV_ALIGN_BOTTOM_MID,120,-20);
lv_obj_set_style_bg_img_src(btn_forward,LV_SYMBOL_RIGHT LV_SYMBOL_RIGHT,0);
lv_obj_add_style(btn_forward,&btn_style,0);
//快退
lv_obj_t *btn_back = lv_btn_create(lv_scr_act());
lv_obj_add_event_cb(btn_back, btn_handler, LV_EVENT_ALL,"back");
lv_obj_set_size(btn_back,60,60);
lv_obj_align(btn_back, LV_ALIGN_BOTTOM_MID,-120,-20);
lv_obj_set_style_bg_img_src(btn_back,LV_SYMBOL_LEFT LV_SYMBOL_LEFT,0);
lv_obj_add_style(btn_back,&btn_style,0);
//下一首
lv_obj_t *btn_next = lv_btn_create(lv_scr_act());
lv_obj_add_event_cb(btn_next, btn_handler, LV_EVENT_ALL,"next_music");
lv_obj_set_size(btn_next,60,60);
lv_obj_align(btn_next, LV_ALIGN_BOTTOM_MID,200,-20);
lv_obj_set_style_bg_img_src(btn_next,LV_SYMBOL_NEXT,0);
lv_obj_add_style(btn_next,&btn_style,0);
//上一首
lv_obj_t *btn_prev = lv_btn_create(lv_scr_act());
lv_obj_add_event_cb(btn_prev, btn_handler, LV_EVENT_ALL,"prev_music");
lv_obj_set_size(btn_prev,60,60);
lv_obj_align(btn_prev, LV_ALIGN_BOTTOM_MID,-200,-20);
lv_obj_set_style_bg_img_src(btn_prev,LV_SYMBOL_PREV,0);
lv_obj_add_style(btn_prev,&btn_style,0);
//显示,隐藏 歌单列表
//风格设置
static lv_style_t style;
lv_style_init(&style);
/*Set a background color and a radius*/
lv_style_set_radius(&style, 5);
lv_style_set_bg_opa(&style, LV_OPA_COVER);
lv_style_set_bg_color(&style, lv_palette_lighten(LV_PALETTE_GREY, 1));
/*Add a shadow*/
lv_style_set_shadow_width(&style, 55);
lv_style_set_shadow_color(&style, lv_palette_main(LV_PALETTE_BLUE));
//歌单列表
lv_obj_t *btn_list = lv_btn_create(lv_scr_act());
lv_obj_add_event_cb(btn_list, btn_handler, LV_EVENT_ALL,"show_list");
lv_obj_set_size(btn_list,60,60);
lv_obj_align(btn_list, LV_ALIGN_BOTTOM_RIGHT,-20,-90);
label = lv_label_create(btn_list);
lv_obj_add_style(label, &font_style, 0);
lv_label_set_text(label, "歌单");
lv_obj_center(label);
lv_obj_add_style(btn_list, &style, 0);
}
//下拉列表事件
static void dd_handler(lv_event_t * e)
{
//获取事件码
lv_event_code_t code = lv_event_get_code(e);
//获取传递的参数
char *msg = lv_event_get_user_data(e);
if(code == LV_EVENT_VALUE_CHANGED)//值被修改
{
if(strcmp(msg,"speed")==0)
{
//获取事件对象
//lv_obj_t *speed = lv_event_get_target(e);
int ret = lv_dropdown_get_selected(speed_obj);
//printf("ret = %d\n",ret);
//修改播放速度
switch (ret)
{
case 0:
{
char cmd[1024]={"speed_set 1\n"};
write(fd_mplayer,cmd,strlen(cmd));
break;
}
case 1:
{
char cmd[1024]={"speed_set 1.25\n"};
write(fd_mplayer,cmd,strlen(cmd));
break;
}
case 2:
{
char cmd[1024]={"speed_set 1.5\n"};
write(fd_mplayer,cmd,strlen(cmd));
break;
}
case 3:
{
char cmd[1024]={"speed_set 2\n"};
write(fd_mplayer,cmd,strlen(cmd));
break;
}
default:
break;
}
}
if(strcmp(msg,"play_mode")==0)
{
//播放模式
int mod = lv_dropdown_get_selected(play_mode);
switch (mod)
{
case 0:{char cmd[1024]={"loop -1\n"};write(fd_mplayer,cmd,strlen(cmd));break;}
case 1:
{ char cmd[1024]={"loop -1\n"};write(fd_mplayer,cmd,strlen(cmd));
strcpy(cmd,"loop 1\n");write(fd_mplayer,cmd,strlen(cmd)); break;}
case 2://列表循环
{ break; }
case 3://随机播放
{ break;
}
default: break;
}
}
}
}
//显示下拉列表
static void show_drop_down()
{
static const char * opts = "x1\n"
"x1.25\n"
"x1.5\n"
"x2";
static const char * opts1 = "single\n"
"circle\n"
"list\n"
"random";
//播放速度 创建一个对象
speed_obj = lv_dropdown_create(lv_scr_act());
//lv_dropdown_set_text(speed_obj, "Speed");
//触发事件
lv_obj_add_event_cb(speed_obj,dd_handler,LV_EVENT_ALL,"speed");
//添加选项
lv_dropdown_set_options_static(speed_obj, opts);
//大小
lv_obj_set_size(speed_obj,80,40);
//位置
lv_obj_align(speed_obj, LV_ALIGN_BOTTOM_RIGHT, -60, -20);
//箭头位置，现在由低朝上
lv_dropdown_set_dir(speed_obj, LV_DIR_BOTTOM);
//列表弹出方向
lv_dropdown_set_symbol(speed_obj, LV_SYMBOL_UP);
//标签
lv_obj_t *speed_label = lv_label_create(lv_scr_act());
lv_obj_add_style(speed_label, &font_style, 0);
lv_label_set_text(speed_label, "播放速度");
lv_obj_align_to(speed_label, speed_obj, LV_ALIGN_OUT_TOP_MID, 0, 0);
//播放模式
play_mode = lv_dropdown_create(lv_scr_act());
//添加字体
//lv_obj_add_style(play_mode, &font_style, 0);
lv_obj_add_event_cb(play_mode,dd_handler,LV_EVENT_ALL,"play_mode");
lv_dropdown_set_options_static(play_mode, opts1);
lv_obj_set_size(play_mode,100,40);
//位置
lv_obj_align(play_mode, LV_ALIGN_BOTTOM_LEFT, 40, -20);
lv_dropdown_set_dir(play_mode, LV_DIR_BOTTOM);
lv_dropdown_set_symbol(play_mode, LV_SYMBOL_UP);
lv_obj_t *mode_label = lv_label_create(lv_scr_act());
lv_obj_add_style(mode_label, &font_style, 0);
lv_label_set_text(mode_label, "播放模式");
lv_obj_align_to(mode_label, play_mode, LV_ALIGN_OUT_TOP_MID, 0, 0);
}
//滑动条事件
static void slider_event_cb(lv_event_t * e)
{
if(!start)return;
//获取传递的参数
char *msg = lv_event_get_user_data(e);
//puts(msg);
if(strcmp(msg,"volume")==0)
{
lv_obj_t * slider = lv_event_get_target(e);//获取事件对象
char buf[8];
int volume=(int)lv_slider_get_value(slider);//获取值
lv_snprintf(buf, sizeof(buf), "%d",volume);
lv_label_set_text(volume_label, buf); //更新音量标签值
lv_obj_align_to(volume_label, slider, LV_ALIGN_OUT_BOTTOM_MID, 0, 10);
usleep(100); //修改音量值
char cmd[1024]={0};
sprintf(cmd,"volume %d 1\n",volume);
write(fd_mplayer,cmd,strlen(cmd));
}
if(strcmp(msg,"play")==0)
{
puts("松开了");
if(start)//启动就先暂停
{pthread_kill(tid_read,10);//暂停读mplayer返回内容
system("killall -19 mplayer");}
int rate = (int)lv_slider_get_value(play_slider);//获取值
float new_time = time_length * rate * 0.01;
int seek_time = new_time - time_pos;
char cmd[1024]={0};
sprintf(cmd,"seek %d\n",seek_time);
//puts(cmd);
write(fd_mplayer,cmd,strlen(cmd));
system("killall -18 mplayer");//播放器继续
pthread_cond_signal(&cond);//唤醒读写mplayer
usleep(1000);
pthread_cond_signal(&cond);//防止被再次暂停
}
}
//显示滑动条
static void show_slider(void)
{ //音量
volume_slider = lv_slider_create(lv_scr_act());
lv_obj_align(volume_slider,LV_ALIGN_LEFT_MID,20,20);//位置
lv_obj_add_event_cb(volume_slider, slider_event_cb, LV_EVENT_VALUE_CHANGED, "volume");//事件
lv_obj_set_size(volume_slider,18,180);//大小
lv_slider_set_value(volume_slider,100,LV_ANIM_OFF);//初始值
/*标签 音量大小 */
volume_label = lv_label_create(lv_scr_act());
lv_label_set_text(volume_label, "100");
lv_obj_align_to(volume_label, volume_slider, LV_ALIGN_OUT_BOTTOM_MID, 0, 10);
lv_obj_t *label = lv_label_create(lv_scr_act());
lv_obj_add_style(label, &font_style, 0);
lv_label_set_text(label, "音量");
lv_obj_align_to(label, volume_label, LV_ALIGN_OUT_TOP_MID, 0, -210);
//播放进度条
play_slider = lv_slider_create(lv_scr_act());
lv_obj_align(play_slider,LV_ALIGN_CENTER,0,120);//位置
lv_obj_set_width(play_slider,400);//宽度
lv_obj_add_event_cb(play_slider, slider_event_cb, LV_EVENT_RELEASED , "play");//事件
lv_slider_set_value(play_slider,0,LV_ANIM_OFF);//初始值
lv_slider_set_range(play_slider, 0, 100);//范围
/*在滑条下创建标签*/
time_length_label = lv_label_create(lv_scr_act());
lv_label_set_text(time_length_label, "0:00");
lv_obj_align_to(time_length_label, play_slider, LV_ALIGN_OUT_RIGHT_BOTTOM,0,20);
time_pos_label = lv_label_create(lv_scr_act());
lv_label_set_text(time_pos_label, "0:00");
lv_obj_align_to(time_pos_label, play_slider, LV_ALIGN_OUT_LEFT_BOTTOM,0,20);
}
//显示界面
static void display_interface()
{
//显示歌单列表
show_list();
//显示按钮
show_button();
//显示下拉列表
show_drop_down();
//显示滑动条
show_slider();
}
//音乐播放器
void music_player()
{
//打开管道文件
fd_mplayer = open("/pipe", O_RDWR);
if(fd_mplayer < 0)
{
perror("打开管道文件失败");
exit(0);
}
//检索本地歌单
get_music_path();
//初始化字体
init_font_style();
//初始化图片父对象
init_pic_parent_obj();
init_title_obj();
//显示界面
display_interface();
}main.c
#include "lvgl/lvgl.h"
#include "lvgl/demos/lv_demos.h"
#include "lv_drivers/display/fbdev.h"
#include "lv_drivers/indev/evdev.h"
#include <unistd.h>
#include <pthread.h>
#include <time.h>
#include <sys/time.h>
#define DISP_BUF_SIZE (480 * 1024)
pthread_mutex_t mutex_lv;//lvgl线程锁
int main(void)
{
/*lvgl初始化*/
lv_init();
/*输出设备初始化及注册*/
fbdev_init();
/*A small buffer for LittlevGL to draw the screen's content*/
static lv_color_t buf[DISP_BUF_SIZE];
/*Initialize a descriptor for the buffer*/
static lv_disp_draw_buf_t disp_buf;
lv_disp_draw_buf_init(&disp_buf, buf, NULL, DISP_BUF_SIZE);
/*Initialize and register a display driver*/
static lv_disp_drv_t disp_drv;
lv_disp_drv_init(&disp_drv);
disp_drv.draw_buf = &disp_buf;
disp_drv.flush_cb = fbdev_flush;
disp_drv.hor_res = 800;
disp_drv.ver_res = 480;
lv_disp_drv_register(&disp_drv);
//输入设备初始化及注册
evdev_init();
static lv_indev_drv_t indev_drv_1;
lv_indev_drv_init(&indev_drv_1); /*Basic initialization*/
indev_drv_1.type = LV_INDEV_TYPE_POINTER;
/*This function will be called periodically (by the library) to get the mouse position and state*/
indev_drv_1.read_cb = evdev_read;
lv_indev_t *mouse_indev = lv_indev_drv_register(&indev_drv_1);
//官方demo
//lv_demo_widgets();
//音乐播放器
music_player();
pthread_mutex_init(&mutex_lv,NULL);
/*事物处理及告知lvgl节拍数*/
while(1) {
pthread_mutex_lock(&mutex_lv);//上锁
lv_timer_handler();//事务处理
pthread_mutex_unlock(&mutex_lv);//解锁
lv_tick_inc(5);//节拍累计
usleep(5000);
}
return 0;
}
/*用户节拍获取*/
uint32_t custom_tick_get(void)
{
static uint64_t start_ms = 0;
if(start_ms == 0) {
struct timeval tv_start;
gettimeofday(&tv_start, NULL);
start_ms = (tv_start.tv_sec * 1000000 + tv_start.tv_usec) / 1000;
}
struct timeval tv_now;
gettimeofday(&tv_now, NULL);
uint64_t now_ms;
now_ms = (tv_now.tv_sec * 1000000 + tv_now.tv_usec) / 1000;
uint32_t time_ms = now_ms - start_ms;
return time_ms;
}
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