平台
Amlogic s905 + Android 7.1
需求
使用视频作为开机动画, 提供接口用于修改开机视频动画.
解决方案
- 打开视频开机动画功能:
//设置属性:
service.bootvideo=1
- 服务注册:
|-- device/amlogic/common/products/tv/init.amlogic.rc
service bootvideo /system/bin/bootplayer /system/etc/bootvideo
class main
user root
group system
disabled
oneshot
- 视频开机动画实现的程序:
修改方法相对简单, 即是在视频播放前, 读取/data/bootvideo, 若不存在此文件, 则播放默认/system/etc/bootvideo
|-- vendor/amlogic/frameworks/av/LibPlayer/bootplayer/bootplayer.c
int main(int argc, char *argv[])
{
play_control_t *pCtrl = NULL;
int pid;
int pos = 0;
int speed = 0;
int tmpneedexit = 0;
int ret = -1;
int fd_di_bypass_all = -1;
media_info_t minfo;
int osd_is_blank = 0;
char tmpcommand[TMP_COMMAND_MAX];
char newframestring[30] = {
0};
char newstring0[30] = {
0};
int new_frame_count = 0;
EMU_STEP tmpstep = EMU_STEP_MENU;
osd1_clear = 0;
char *di_bypass_all_path = "/sys/module/di/parameters/bypass_all";
pCtrl = (play_control_t*)malloc(sizeof(play_control_t));
memset(pCtrl, 0, sizeof(play_control_t));
memset(&minfo, 0, sizeof(media_info_t));
if (argc < 2) {
ALOGD("usage:player file\n");
return -1;
}
//amsysfs_set_sysfs_str(di_bypass_all_path, "1");
set_video_axis();
player_init();
//streamsource_init();
player_register_update_callback(&pCtrl->callback_fn, &update_player_info, 1000);
ALOGD("player callback register....\n");
//尝试读取/data/bootvideo, 若不存在则使用默认传进视频文件地址.
char* videoPath = "/data/bootvideo";
FILE* fp = fopen(videoPath, "r");
if(fp){
pCtrl->file_name = strdup(videoPath);
}else{
pCtrl->file_name = strdup(argv[1]);
}
ALOGD("player pCtrl->file_name=%s", pCtrl->file_name);
//...
}
- 解决SELinux问题, 打开bootplayer的文件读取权限.
|-- system/sepolicy/domain.te
neverallow {
domain
-system_server
-system_app
-init
-shell
-bootanim
-bootanimcp
-bootvideo
-installd # for relabelfrom and unlink, check for this in explicit neverallow
} system_data_file:file no_w_file_perms;
|-- device/amlogic/common/sepolicy/bootvideo.te
# 增加代码
allow bootvideo system_data_file:file{read getattr open write};
结语
使用时, 只需要通过服务或应用, 把视频文件放置到/data/bootvideo中即可. 若为普通APP权限, 则系统可适当增加一个文件拷贝服务, 将指定文件拷贝到/data下, 并赋与相关权限即可.