SDL_cdrom.h
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上传日期:2022-06-22
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- /*
- SDL - Simple DirectMedia Layer
- Copyright (C) 1997-2006 Sam Lantinga
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with this library; if not, write to the Free Software
- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- Sam Lantinga
- slouken@libsdl.org
- */
- /* This is the CD-audio control API for Simple DirectMedia Layer */
- #ifndef _SDL_cdrom_h
- #define _SDL_cdrom_h
- #include "SDL_stdinc.h"
- #include "SDL_error.h"
- #include "begin_code.h"
- /* Set up for C function definitions, even when using C++ */
- #ifdef __cplusplus
- extern "C" {
- #endif
- /* In order to use these functions, SDL_Init() must have been called
- with the SDL_INIT_CDROM flag. This causes SDL to scan the system
- for CD-ROM drives, and load appropriate drivers.
- */
- /* The maximum number of CD-ROM tracks on a disk */
- #define SDL_MAX_TRACKS 99
- /* The types of CD-ROM track possible */
- #define SDL_AUDIO_TRACK 0x00
- #define SDL_DATA_TRACK 0x04
- /* The possible states which a CD-ROM drive can be in. */
- typedef enum {
- CD_TRAYEMPTY,
- CD_STOPPED,
- CD_PLAYING,
- CD_PAUSED,
- CD_ERROR = -1
- } CDstatus;
- /* Given a status, returns true if there's a disk in the drive */
- #define CD_INDRIVE(status) ((int)(status) > 0)
- typedef struct SDL_CDtrack {
- Uint8 id; /* Track number */
- Uint8 type; /* Data or audio track */
- Uint16 unused;
- Uint32 length; /* Length, in frames, of this track */
- Uint32 offset; /* Offset, in frames, from start of disk */
- } SDL_CDtrack;
- /* This structure is only current as of the last call to SDL_CDStatus() */
- typedef struct SDL_CD {
- int id; /* Private drive identifier */
- CDstatus status; /* Current drive status */
- /* The rest of this structure is only valid if there's a CD in drive */
- int numtracks; /* Number of tracks on disk */
- int cur_track; /* Current track position */
- int cur_frame; /* Current frame offset within current track */
- SDL_CDtrack track[SDL_MAX_TRACKS+1];
- } SDL_CD;
- /* Conversion functions from frames to Minute/Second/Frames and vice versa */
- #define CD_FPS 75
- #define FRAMES_TO_MSF(f, M,S,F) {
- int value = f;
- *(F) = value%CD_FPS;
- value /= CD_FPS;
- *(S) = value%60;
- value /= 60;
- *(M) = value;
- }
- #define MSF_TO_FRAMES(M, S, F) ((M)*60*CD_FPS+(S)*CD_FPS+(F))
- /* CD-audio API functions: */
- /* Returns the number of CD-ROM drives on the system, or -1 if
- SDL_Init() has not been called with the SDL_INIT_CDROM flag.
- */
- extern DECLSPEC int SDLCALL SDL_CDNumDrives(void);
- /* Returns a human-readable, system-dependent identifier for the CD-ROM.
- Example:
- "/dev/cdrom"
- "E:"
- "/dev/disk/ide/1/master"
- */
- extern DECLSPEC const char * SDLCALL SDL_CDName(int drive);
- /* Opens a CD-ROM drive for access. It returns a drive handle on success,
- or NULL if the drive was invalid or busy. This newly opened CD-ROM
- becomes the default CD used when other CD functions are passed a NULL
- CD-ROM handle.
- Drives are numbered starting with 0. Drive 0 is the system default CD-ROM.
- */
- extern DECLSPEC SDL_CD * SDLCALL SDL_CDOpen(int drive);
- /* This function returns the current status of the given drive.
- If the drive has a CD in it, the table of contents of the CD and current
- play position of the CD will be stored in the SDL_CD structure.
- */
- extern DECLSPEC CDstatus SDLCALL SDL_CDStatus(SDL_CD *cdrom);
- /* Play the given CD starting at 'start_track' and 'start_frame' for 'ntracks'
- tracks and 'nframes' frames. If both 'ntrack' and 'nframe' are 0, play
- until the end of the CD. This function will skip data tracks.
- This function should only be called after calling SDL_CDStatus() to
- get track information about the CD.
- For example:
- // Play entire CD:
- if ( CD_INDRIVE(SDL_CDStatus(cdrom)) )
- SDL_CDPlayTracks(cdrom, 0, 0, 0, 0);
- // Play last track:
- if ( CD_INDRIVE(SDL_CDStatus(cdrom)) ) {
- SDL_CDPlayTracks(cdrom, cdrom->numtracks-1, 0, 0, 0);
- }
- // Play first and second track and 10 seconds of third track:
- if ( CD_INDRIVE(SDL_CDStatus(cdrom)) )
- SDL_CDPlayTracks(cdrom, 0, 0, 2, 10);
- This function returns 0, or -1 if there was an error.
- */
- extern DECLSPEC int SDLCALL SDL_CDPlayTracks(SDL_CD *cdrom,
- int start_track, int start_frame, int ntracks, int nframes);
- /* Play the given CD starting at 'start' frame for 'length' frames.
- It returns 0, or -1 if there was an error.
- */
- extern DECLSPEC int SDLCALL SDL_CDPlay(SDL_CD *cdrom, int start, int length);
- /* Pause play -- returns 0, or -1 on error */
- extern DECLSPEC int SDLCALL SDL_CDPause(SDL_CD *cdrom);
- /* Resume play -- returns 0, or -1 on error */
- extern DECLSPEC int SDLCALL SDL_CDResume(SDL_CD *cdrom);
- /* Stop play -- returns 0, or -1 on error */
- extern DECLSPEC int SDLCALL SDL_CDStop(SDL_CD *cdrom);
- /* Eject CD-ROM -- returns 0, or -1 on error */
- extern DECLSPEC int SDLCALL SDL_CDEject(SDL_CD *cdrom);
- /* Closes the handle for the CD-ROM drive */
- extern DECLSPEC void SDLCALL SDL_CDClose(SDL_CD *cdrom);
- /* Ends C function definitions when using C++ */
- #ifdef __cplusplus
- }
- #endif
- #include "close_code.h"
- #endif /* _SDL_video_h */