xref: /haiku/src/add-ons/media/media-add-ons/usb_webcam/Producer.h (revision 02af02f93ae67777d65cce1eda1c5f21aaed3446)

/*
 * Copyright 2004-2008, François Revol, <revol@free.fr>.
 * Distributed under the terms of the MIT License.
 */
#ifndef _VIDEO_PRODUCER_H
#define _VIDEO_PRODUCER_H

#include <kernel/OS.h>
#include <media/BufferProducer.h>
#include <media/Controllable.h>
#include <media/MediaDefs.h>
#include <media/MediaEventLooper.h>
#include <media/MediaNode.h>
#include <support/Locker.h>
#include <support/String.h>

class CamDevice;
class BParameter;
class BTextParameter;

class VideoProducer :
	public virtual BMediaEventLooper,
	public virtual BBufferProducer,
	public virtual BControllable {
public:
						VideoProducer(BMediaAddOn *addon, CamDevice *dev,
								const char *name, int32 internal_id);
virtual					~VideoProducer();

virtual	status_t		InitCheck() const { return fInitStatus; }


/* BMediaNode */
public:
virtual port_id		ControlPort() const;
virtual	BMediaAddOn	*AddOn(int32 * internal_id) const;
virtual	status_t 	HandleMessage(int32 message, const void *data,
							size_t size);
protected:
virtual	void 		Preroll();
virtual void		SetTimeSource(BTimeSource * time_source);
virtual status_t	RequestCompleted(const media_request_info & info);

/* BMediaEventLooper */
protected:
virtual	void 		NodeRegistered();
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		TimeWarp(bigtime_t at_real_time,
							bigtime_t to_performance_time);
virtual status_t	AddTimer(bigtime_t at_performance_time, int32 cookie);
virtual void		SetRunMode(run_mode mode);
virtual void		HandleEvent(const media_timed_event *event,
							bigtime_t lateness, bool realTimeEvent = false);
virtual void		CleanUpEvent(const media_timed_event *event);
virtual bigtime_t	OfflineTime();
virtual void		ControlLoop();
virtual status_t	DeleteHook(BMediaNode * node);

/* BBufferProducer */
protected:
virtual	status_t	FormatSuggestionRequested(media_type type, int32 quality,
							media_format * format);
virtual	status_t 	FormatProposal(const media_source &output,
							media_format *format);
virtual	status_t	FormatChangeRequested(const media_source &source,
							const media_destination &destination,
							media_format *io_format, int32 *_deprecated_);
virtual	status_t 	GetNextOutput(int32 * cookie, media_output * out_output);
virtual	status_t	DisposeOutputCookie(int32 cookie);
virtual	status_t	SetBufferGroup(const media_source &for_source,
							BBufferGroup * group);
virtual	status_t 	VideoClippingChanged(const media_source &for_source,
							int16 num_shorts, int16 *clip_data,
							const media_video_display_info &display,
							int32 * _deprecated_);
virtual	status_t	GetLatency(bigtime_t * out_latency);
virtual	status_t	PrepareToConnect(const media_source &what,
							const media_destination &where,
							media_format *format,
							media_source *out_source, char *out_name);
virtual	void		Connect(status_t error, const media_source &source,
							const media_destination &destination,
							const media_format & format, char *io_name);
virtual	void 		Disconnect(const media_source & what,
							const media_destination & where);
virtual	void 		LateNoticeReceived(const media_source & what,
							bigtime_t how_much, bigtime_t performance_time);
virtual	void 		EnableOutput(const media_source & what, bool enabled,
							int32 * _deprecated_);
virtual	status_t	SetPlayRate(int32 numer,int32 denom);
virtual	void 		AdditionalBufferRequested(const media_source & source,
							media_buffer_id prev_buffer, bigtime_t prev_time,
							const media_seek_tag * prev_tag);
virtual	void		LatencyChanged(const media_source & source,
							const media_destination & destination,
							bigtime_t new_latency, uint32 flags);

/* BControllable */
protected:
virtual status_t	GetParameterValue(int32 id, bigtime_t *last_change,
							void *value, size_t *size);
virtual void		SetParameterValue(int32 id, bigtime_t when,
							const void *value, size_t size);
virtual status_t	StartControlPanel(BMessenger *out_messenger);

/* state */
private:
		void				HandleStart(bigtime_t performance_time);
		void				HandleStop();
		void				HandleTimeWarp(bigtime_t performance_time);
		void				HandleSeek(bigtime_t performance_time);

		void				_UpdateStats();

static	int32				fInstances;

		status_t			fInitStatus;

		int32				fInternalID;
		BMediaAddOn			*fAddOn;
		CamDevice			*fCamDevice;

		BLocker				fLock;
			BBufferGroup	*fBufferGroup;

		thread_id			fThread;
		sem_id				fFrameSync;
static	int32				_frame_generator_(void *data);
		int32				FrameGenerator();

		/* The remaining variables should be declared volatile, but they
		 * are not here to improve the legibility of the sample code. */
		uint32				fFrame;
		uint32				fFrameBase;
		bigtime_t			fPerformanceTimeBase;
		bigtime_t			fProcessingLatency;
		media_output		fOutput;
		media_raw_video_format	fConnectedFormat;
		bool				fRunning;
		bool				fConnected;
		bool				fEnabled;

		enum {
			 P_COLOR,
			 P_INFO,
			 P_LAST			// first available for addons
		};
		uint32				fColor;
		BString				fInfoString;
		bigtime_t			fLastColorChange;	// TODO: rename

		struct {
			uint32 frames;
			uint32 actual;
			uint32 missed;
			bigtime_t stamp;
		}					fStats[2];
};

#endif