haiku/headers/os/media/BufferProducer.h

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/*******************************************************************************
/
/ File: BBufferProducer.h
/
/ Description: A BBufferProducer is any source of media buffers in the Media Kit
/
/ Copyright 1997-98, Be Incorporated, All Rights Reserved
/
*******************************************************************************/
#if !defined(_BUFFER_PRODUCER_H)
#define _BUFFER_PRODUCER_H
#include <MediaDefs.h>
#include <MediaNode.h>
namespace BPrivate { namespace media {
class BMediaRosterEx;
}}
class BBufferProducer :
public virtual BMediaNode
{
protected:
/* this has to be at the top to force a vtable */
virtual ~BBufferProducer();
public:
/* Supported formats for low-level clipping data */
enum {
B_CLIP_SHORT_RUNS = 1
};
/* Handy conversion functions for dealing with clip information */
static status_t ClipDataToRegion(
int32 format,
int32 size,
const void * data,
BRegion * region);
media_type ProducerType();
protected:
explicit BBufferProducer(
media_type producer_type /* = B_MEDIA_UNKNOWN_TYPE */);
enum suggestion_quality {
B_ANY_QUALITY = 0,
B_LOW_QUALITY = 10,
B_MEDIUM_QUALITY = 50,
B_HIGH_QUALITY = 100
};
/* functionality of BBufferProducer */
virtual status_t FormatSuggestionRequested(
media_type type,
int32 quality,
media_format * format) = 0;
virtual status_t FormatProposal(
const media_source & output,
media_format * ioFormat) = 0;
/* If the format isn't good, put a good format into *io_format and return error */
/* If format has wildcard, specialize to what you can do (and change). */
/* If you can change the format, return OK. */
/* The request comes from your destination sychronously, so you cannot ask it */
/* whether it likes it -- you should assume it will since it asked. */
virtual status_t FormatChangeRequested(
const media_source & source,
const media_destination & destination,
media_format * io_format,
int32 * _deprecated_) = 0;
virtual status_t GetNextOutput( /* cookie starts as 0 */
int32 * cookie,
media_output * out_output) = 0;
virtual status_t DisposeOutputCookie(
int32 cookie) = 0;
/* In this function, you should either pass on the group to your upstream guy, */
/* or delete your current group and hang on to this group. Deleting the previous */
/* group (unless you passed it on with the reclaim flag set to false) is very */
/* important, else you will 1) leak memory and 2) block someone who may want */
/* to reclaim the buffers living in that group. */
virtual status_t SetBufferGroup(
const media_source & for_source,
BBufferGroup * group) = 0;
/* Format of clipping is (as int16-s): <from line> <npairs> <startclip> <endclip>. */
/* Repeat for each line where the clipping is different from the previous line. */
/* If <npairs> is negative, use the data from line -<npairs> (there are 0 pairs after */
/* a negative <npairs>. Yes, we only support 32k*32k frame buffers for clipping. */
/* Any non-0 field of 'display' means that that field changed, and if you don't support */
/* that change, you should return an error and ignore the request. Note that the buffer */
/* offset values do not have wildcards; 0 (or -1, or whatever) are real values and must */
/* be adhered to. */
virtual status_t VideoClippingChanged(
const media_source & for_source,
int16 num_shorts,
int16 * clip_data,
const media_video_display_info & display,
int32 * _deprecated_);
/* Iterates over all outputs and maxes the latency found */
virtual status_t GetLatency(
bigtime_t * out_lantency);
virtual status_t PrepareToConnect(
const media_source & what,
const media_destination & where,
media_format * format,
media_source * out_source,
char * out_name) = 0;
virtual void Connect(
status_t error,
const media_source & source,
const media_destination & destination,
const media_format & format,
char * io_name) = 0;
virtual void Disconnect(
const media_source & what,
const media_destination & where) = 0;
virtual void LateNoticeReceived(
const media_source & what,
bigtime_t how_much,
bigtime_t performance_time) = 0;
virtual void EnableOutput(
const media_source & what,
bool enabled,
int32 * _deprecated_) = 0;
virtual status_t SetPlayRate(
int32 numer,
int32 denom);
virtual status_t HandleMessage( /* call this from the thread that listens to the port */
int32 message,
const void * data,
size_t size);
virtual void AdditionalBufferRequested( // used to be Reserved 0
const media_source & source,
media_buffer_id prev_buffer,
bigtime_t prev_time,
const media_seek_tag * prev_tag); // may be NULL
virtual void LatencyChanged( // used to be Reserved 1
const media_source & source,
const media_destination & destination,
bigtime_t new_latency,
uint32 flags);
/* Use this function in BBufferProducer to pass on the buffer. */
status_t SendBuffer(
BBuffer * buffer,
const media_destination & destination);
status_t SendDataStatus(
int32 status,
const media_destination & destination,
bigtime_t at_time);
/* Check in advance if a target is prepared to accept a format. You may */
/* want to call this from Connect(), although that's not required. */
status_t ProposeFormatChange(
media_format * format,
const media_destination & for_destination);
/* Tell consumer to accept a proposed format change */
/* YOU MUST NOT CALL BROADCAST_BUFFER WHILE THIS CALL IS OUTSTANDING! */
status_t ChangeFormat(
const media_source & for_source,
const media_destination & for_destination,
media_format * format);
/* Check how much latency the down-stream graph introduces */
status_t FindLatencyFor(
const media_destination & for_destination,
bigtime_t * out_latency,
media_node_id * out_timesource);
/* Find the tag of a previously seen buffer to expedite seeking */
status_t FindSeekTag(
const media_destination & for_destination,
bigtime_t in_target_time,
media_seek_tag * out_tag,
bigtime_t * out_tagged_time,
uint32 * out_flags = 0,
uint32 in_flags = 0);
/* Set the initial latency, which is the maximum additional latency */
/* that will be imposed while starting/syncing to a signal (such as */
/* starting a TV capture card in the middle of a field). Most nodes */
/* have this at 0 (the default); only TV input Nodes need it currently */
/* because they slave to a low-resolution (59.94 Hz) clock that arrives */
/* from the outside world. Call this from the constructor if you need it. */
void SetInitialLatency(
bigtime_t inInitialLatency,
uint32 flags = 0);
private:
friend class BBufferConsumer;
friend class BMediaNode;
friend class BMediaRoster;
friend class BPrivate::media::BMediaRosterEx;
BBufferProducer(); /* private unimplemented */
BBufferProducer(
const BBufferProducer & clone);
BBufferProducer & operator=(
const BBufferProducer & clone);
/* Mmmh, stuffing! */
status_t _Reserved_BufferProducer_0(void *); /* AdditionalBufferRequested() */
status_t _Reserved_BufferProducer_1(void *); /* LatencyChanged() */
virtual status_t _Reserved_BufferProducer_2(void *);
virtual status_t _Reserved_BufferProducer_3(void *);
virtual status_t _Reserved_BufferProducer_4(void *);
virtual status_t _Reserved_BufferProducer_5(void *);
virtual status_t _Reserved_BufferProducer_6(void *);
virtual status_t _Reserved_BufferProducer_7(void *);
virtual status_t _Reserved_BufferProducer_8(void *);
virtual status_t _Reserved_BufferProducer_9(void *);
virtual status_t _Reserved_BufferProducer_10(void *);
virtual status_t _Reserved_BufferProducer_11(void *);
virtual status_t _Reserved_BufferProducer_12(void *);
virtual status_t _Reserved_BufferProducer_13(void *);
virtual status_t _Reserved_BufferProducer_14(void *);
virtual status_t _Reserved_BufferProducer_15(void *);
media_type fProducerType;
bigtime_t fInitialLatency;
uint32 fInitialFlags;
bigtime_t fDelay;
static status_t clip_shorts_to_region(
const int16 * data,
int count,
BRegion * output);
static status_t clip_region_to_shorts(
const BRegion * input,
int16 * data,
int max_count,
int * out_count);
uint32 _reserved_buffer_producer_[12];
};
#endif /* _BUFFER_PRODUCER_H */