Android Media Player Error

Android mediaplayer發生錯誤時會顯示

E/MediaPlayer( 1598): error (1, -19)
E/MediaPlayer( 1598): Error (1,-19)

並呼叫

onErrorListener.onError(MediaPlayer mp, int what, int extra)

就是對應 what = 1, extra = 19

what的定義可以在下面位置找到

frameworks/base/include/media/mediaplayer.h

要注意的一點是, Android從2.x開始已把Media Framework從Opencore換成StageFright, Error Code不是參考OpenCore的, 應該要參考標準的errno.h, 所以這邊發生的是

#define ENODEV      19  /* No such device */

ErrorCode參照
what:

enum media_player_states {
    MEDIA_PLAYER_STATE_ERROR        = 0,
    MEDIA_PLAYER_IDLE                           = 1 << 0,     // 1
    MEDIA_PLAYER_INITIALIZED             = 1 << 1,    // 2
    MEDIA_PLAYER_PREPARING              = 1 << 2,    // 4
    MEDIA_PLAYER_PREPARED                = 1 << 3,    // 8
    MEDIA_PLAYER_STARTED                   = 1 << 4,   // 16
    MEDIA_PLAYER_PAUSED                     = 1 << 5,   // 32
    MEDIA_PLAYER_STOPPED                    = 1 << 6,  // 64
    MEDIA_PLAYER_PLAYBACK_COMPLETE  = 1 << 7
};

extra: (ref: kernel/include/asm-generic/errno-base.h)

#define EPERM        1  /* Operation not permitted */
#define ENOENT       2  /* No such file or directory */
#define ESRCH        3  /* No such process */
#define EINTR        4  /* Interrupted system call */
#define EIO      5  /* I/O error */
#define ENXIO        6  /* No such device or address */
#define E2BIG        7  /* Argument list too long */
#define ENOEXEC      8  /* Exec format error */
#define EBADF        9  /* Bad file number */
#define ECHILD      10  /* No child processes */
#define EAGAIN      11  /* Try again */
#define ENOMEM      12  /* Out of memory */
#define EACCES      13  /* Permission denied */
#define EFAULT      14  /* Bad address */
#define ENOTBLK     15  /* Block device required */
#define EBUSY       16  /* Device or resource busy */
#define EEXIST      17  /* File exists */
#define EXDEV       18  /* Cross-device link */
#define ENODEV      19  /* No such device */
#define ENOTDIR     20  /* Not a directory */
#define EISDIR      21  /* Is a directory */
#define EINVAL      22  /* Invalid argument */
#define ENFILE      23  /* File table overflow */
#define EMFILE      24  /* Too many open files */
#define ENOTTY      25  /* Not a typewriter */
#define ETXTBSY     26  /* Text file busy */
#define EFBIG       27  /* File too large */
#define ENOSPC      28  /* No space left on device */
#define ESPIPE      29  /* Illegal seek */
#define EROFS       30  /* Read-only file system */
#define EMLINK      31  /* Too many links */
#define EPIPE       32  /* Broken pipe */
#define EDOM        33  /* Math argument out of domain of func */
#define ERANGE      34  /* Math result not representable */

參考連結

1. http://stackoverflow.com/questions/3857578/android-mediaplayer-error-codes
2. http://univasity.iteye.com/blog/898613