haiku/headers/os/media/MediaNode.h

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/*******************************************************************************
/
/ File: MediaNode.h
/
/ Description: BMediaNode is the indirect base class for all Media Kit participants.
/ However, you should use the more specific BBufferConsumer, BBufferProducer
/ and others rather than BMediaNode directly. It's OK to multiply inherit.
/
/ Copyright 1997-98, Be Incorporated, All Rights Reserved
/
*******************************************************************************/
#if !defined(_MEDIA_NODE_H)
#define _MEDIA_NODE_H
#include <MediaDefs.h>
#include <Point.h>
#include <new>
class BMediaAddOn;
class media_node {
public:
media_node();
~media_node();
media_node_id node;
port_id port;
uint32 kind;
static media_node null;
private:
uint32 _reserved_[3];
};
struct media_input {
media_input();
~media_input();
media_node node;
media_source source;
media_destination destination;
media_format format;
char name[B_MEDIA_NAME_LENGTH];
private:
uint32 _reserved_media_input_[4];
};
struct media_output {
media_output();
~media_output();
media_node node;
media_source source;
media_destination destination;
media_format format;
char name[B_MEDIA_NAME_LENGTH];
private:
uint32 _reserved_media_output_[4];
};
struct live_node_info {
live_node_info();
~live_node_info();
media_node node;
BPoint hint_point;
char name[B_MEDIA_NAME_LENGTH];
private:
char reserved[160];
};
struct media_request_info
{
enum what_code
{
B_SET_VIDEO_CLIPPING_FOR = 1,
B_REQUEST_FORMAT_CHANGE,
B_SET_OUTPUT_ENABLED,
B_SET_OUTPUT_BUFFERS_FOR,
B_FORMAT_CHANGED = 4097
};
what_code what;
int32 change_tag;
status_t status;
int32 cookie;
void * user_data;
media_source source;
media_destination destination;
media_format format;
uint32 _reserved_[32];
};
struct media_node_attribute
{
enum {
B_R40_COMPILED = 1, // has this attribute if compiled using R4.0 headers
B_USER_ATTRIBUTE_NAME = 0x1000000,
B_FIRST_USER_ATTRIBUTE
};
uint32 what;
uint32 flags; // per attribute
int64 data; // per attribute
};
namespace BPrivate { namespace media {
class TimeSourceObject;
class SystemTimeSourceObject;
class BMediaRosterEx;
} } // BPrivate::media
class BMediaNode
{
protected:
/* this has to be on top rather than bottom to force a vtable in mwcc */
virtual ~BMediaNode(); /* should be called through Release() */
public:
enum run_mode {
B_OFFLINE = 1, /* data accurate, no realtime constraint */
B_DECREASE_PRECISION, /* when slipping, try to catch up */
B_INCREASE_LATENCY, /* when slipping, increase playout delay */
B_DROP_DATA, /* when slipping, skip data */
B_RECORDING /* you're on the receiving end of recording; buffers are guaranteed to be late */
};
BMediaNode * Acquire(); /* return itself */
BMediaNode * Release(); /* release will decrement refcount, and delete if 0 */
const char * Name() const;
media_node_id ID() const;
uint64 Kinds() const;
media_node Node() const;
run_mode RunMode() const;
BTimeSource * TimeSource() const;
/* this port is what a media node listens to for commands */
virtual port_id ControlPort() const;
virtual BMediaAddOn* AddOn(
int32 * internal_id) const = 0; /* Who instantiated you -- or NULL for app class */
/* These will be sent to anyone watching the MediaRoster. */
/* The message field "be:node_id" will contain the node ID. */
enum node_error {
/* Note that these belong with the notifications in MediaDefs.h! */
/* They are here to provide compiler type checking in ReportError(). */
B_NODE_FAILED_START = 'TRI0',
B_NODE_FAILED_STOP, // TRI1
B_NODE_FAILED_SEEK, // TRI2
B_NODE_FAILED_SET_RUN_MODE, // TRI3
B_NODE_FAILED_TIME_WARP, // TRI4
B_NODE_FAILED_PREROLL, // TRI5
B_NODE_FAILED_SET_TIME_SOURCE_FOR, // TRI6
/* display this node with a blinking exclamation mark or something */
B_NODE_IN_DISTRESS // TRI7
/* TRIA and up are used in MediaDefs.h */
};
protected:
/* Send one of the above codes to anybody who's watching. */
status_t ReportError(
node_error what,
const BMessage * info = NULL); /* String "message" for instance */
/* When you've handled a stop request, call this function. If anyone is */
/* listening for stop information from you, they will be notified. Especially */
/* important for offline capable Nodes. */
status_t NodeStopped(
bigtime_t whenPerformance); // performance time
void TimerExpired(
bigtime_t notifyPoint, // performance time
int32 cookie,
status_t error = B_OK);
explicit BMediaNode( /* constructor sets refcount to 1 */
const char * name);
status_t WaitForMessage(
bigtime_t waitUntil,
uint32 flags = 0,
void * _reserved_ = 0);
/* These don't return errors; instead, they use the global error condition reporter. */
/* A node is required to have a queue of at least one pending command (plus TimeWarp) */
/* and is recommended to allow for at least one pending command of each type. */
/* Allowing an arbitrary number of outstanding commands might be nice, but apps */
/* cannot depend on that happening. */
virtual void Start(
bigtime_t performance_time);
virtual void Stop(
bigtime_t performance_time,
bool immediate);
virtual void Seek(
bigtime_t media_time,
bigtime_t performance_time);
virtual void SetRunMode(
run_mode mode);
virtual void TimeWarp(
bigtime_t at_real_time,
bigtime_t to_performance_time);
virtual void Preroll();
virtual void SetTimeSource(
BTimeSource * time_source);
public:
virtual status_t HandleMessage(
int32 message,
const void * data,
size_t size);
void HandleBadMessage( /* call this with messages you and your superclasses don't recognize */
int32 code,
const void * buffer,
size_t size);
/* Called from derived system classes; you don't need to */
void AddNodeKind(
uint64 kind);
// These were not in 4.0.
// We added them in 4.1 for future use. They just call
// the default global versions for now.
void * operator new(
size_t size);
void * operator new(
size_t size,
const nothrow_t &) throw();
void operator delete(
void * ptr);
#if !__MWERKS__
// there's a bug in MWCC under R4.1 and earlier
void operator delete(
void * ptr,
const nothrow_t &) throw();
#endif
protected:
/* Called when requests have completed, or failed. */
virtual status_t RequestCompleted( /* reserved 0 */
const media_request_info & info);
private:
friend class BTimeSource;
friend class BMediaRoster;
friend class BBufferProducer; // for getting _mNodeID
friend class BPrivate::media::TimeSourceObject;
friend class BPrivate::media::SystemTimeSourceObject;
friend class BPrivate::media::BMediaRosterEx;
// Deprecated in 4.1
int32 IncrementChangeTag();
int32 ChangeTag();
int32 MintChangeTag();
status_t ApplyChangeTag(
int32 previously_reserved);
/* Mmmh, stuffing! */
protected:
virtual status_t DeleteHook(BMediaNode * node); /* reserved 1 */
virtual void NodeRegistered(); /* reserved 2 */
public:
/* fill out your attributes in the provided array, returning however many you have. */
virtual status_t GetNodeAttributes( /* reserved 3 */
media_node_attribute * outAttributes,
size_t inMaxCount);
virtual status_t AddTimer(
bigtime_t at_performance_time,
int32 cookie);
private:
status_t _Reserved_MediaNode_0(void *); /* DeleteHook() */
status_t _Reserved_MediaNode_1(void *); /* RequestCompletionHook() */
status_t _Reserved_MediaNode_2(void *); /* NodeRegistered() */
status_t _Reserved_MediaNode_3(void *); /* GetNodeAttributes() */
status_t _Reserved_MediaNode_4(void *); /* AddTimer() */
virtual status_t _Reserved_MediaNode_5(void *);
virtual status_t _Reserved_MediaNode_6(void *);
virtual status_t _Reserved_MediaNode_7(void *);
virtual status_t _Reserved_MediaNode_8(void *);
virtual status_t _Reserved_MediaNode_9(void *);
virtual status_t _Reserved_MediaNode_10(void *);
virtual status_t _Reserved_MediaNode_11(void *);
virtual status_t _Reserved_MediaNode_12(void *);
virtual status_t _Reserved_MediaNode_13(void *);
virtual status_t _Reserved_MediaNode_14(void *);
virtual status_t _Reserved_MediaNode_15(void *);
BMediaNode(); /* private unimplemented */
BMediaNode(
const BMediaNode & clone);
BMediaNode & operator=(
const BMediaNode & clone);
BMediaNode( /* constructor sets refcount to 1 */
const char * name,
media_node_id id,
uint32 kinds);
void _InitObject(const char *, media_node_id, uint64);
media_node_id fNodeID;
BTimeSource * fTimeSource;
int32 fRefCount;
char fName[B_MEDIA_NAME_LENGTH];
run_mode fRunMode;
int32 _mChangeCount; // deprecated
int32 _mChangeCountReserved; // deprecated
uint64 fKinds;
media_node_id fTimeSourceID;
BBufferProducer * fProducerThis;
BBufferConsumer * fConsumerThis;
BFileInterface * fFileInterfaceThis;
BControllable * fControllableThis;
BTimeSource * fTimeSourceThis;
bool _mReservedBool[4];
mutable port_id fControlPort;
uint32 _reserved_media_node_[8];
protected:
static int32 NewChangeTag(); // for use by BBufferConsumer, mostly
private:
// dont' rename this one, it's static and needed for binary compatibility
static int32 _m_changeTag; // not to be confused with _mChangeCount
};
#endif /* _MEDIA_NODE_H */