Amlogic s905動態修改開機視頻動畫

平臺

Amlogic s905 + Android 7.1

需求

使用視頻作爲開機動畫, 提供接口用於修改開機視頻動畫.

解決方案

1. 打開視頻開機動畫功能:

//設置屬性:
service.bootvideo=1 

2. 服務註冊:
   |-- device/amlogic/common/products/tv/init.amlogic.rc

service bootvideo /system/bin/bootplayer /system/etc/bootvideo
    class main
    user root
    group system
    disabled
    oneshot

3. 視頻開機動畫實現的程序:
   修改方法相對簡單, 即是在視頻播放前, 讀取/data/bootvideo, 若不存在此文件, 則播放默認/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");

    //嘗試讀取/data/bootvideo, 若不存在則使用默認傳進視頻文件地址.
	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);
	//...
	}

4. 解決SELinux問題, 打開bootplayer的文件讀取權限.
   |-- 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

# 增加代碼
allow bootvideo system_data_file:file{read getattr open write};

結語

使用時, 只需要通過服務或應用, 把視頻文件放置到/data/bootvideo中即可. 若爲普通APP權限, 則系統可適當增加一個文件拷貝服務, 將指定文件拷貝到/data下, 並賦與相關權限即可.