Query

GstQuery *query;
gboolean res;
query = gst_query_new_duration (GST_FORMAT_TIME);
res = gst_element_query (pipeline, query);
if (res) {
  gint64 duration;
  gst_query_parse_duration (query, NULL, &duration);
  g_print ("duration = %"GST_TIME_FORMAT, GST_TIME_ARGS (duration));
} else {
  g_print ("duration query failed...");
}
gst_query_unref (query);

Members

Functions

addAllocationMeta

void addAllocationMeta(gobject.types.GType api, gst.structure.Structure params)

Add api with params as one of the supported metadata API to query.

addAllocationParam

void addAllocationParam(gst.allocator.Allocator allocator, gst.allocation_params.AllocationParams params)

Add allocator and its params as a supported memory allocator.

addAllocationPool

void addAllocationPool(gst.buffer_pool.BufferPool pool, uint size, uint minBuffers, uint maxBuffers)

Set the pool parameters in query.

addBufferingRange

bool addBufferingRange(long start, long stop)

Set the buffering-ranges array field in query. The current last start position of the array should be inferior to start.

addSchedulingMode

void addSchedulingMode(gst.types.PadMode mode)

Add mode as one of the supported scheduling modes to query.

findAllocationMeta

bool findAllocationMeta(gobject.types.GType api, uint index)

Check if query has metadata api set. When this function returns true, index will contain the index where the requested API and the parameters can be found.

getNAllocationMetas

uint getNAllocationMetas()

Retrieve the number of values currently stored in the meta API array of the query's structure.

getNAllocationParams

uint getNAllocationParams()

Retrieve the number of values currently stored in the allocator params array of the query's structure.

getNAllocationPools

uint getNAllocationPools()

Retrieve the number of values currently stored in the pool array of the query's structure.

getNBufferingRanges

uint getNBufferingRanges()

Retrieve the number of values currently stored in the buffered-ranges array of the query's structure.

getNSchedulingModes

uint getNSchedulingModes()

Retrieve the number of values currently stored in the scheduling mode array of the query's structure.

getStructure

gst.structure.Structure getStructure()

Get the structure of a query.

hasSchedulingMode

bool hasSchedulingMode(gst.types.PadMode mode)

Check if query has scheduling mode set.

hasSchedulingModeWithFlags

bool hasSchedulingModeWithFlags(gst.types.PadMode mode, gst.types.SchedulingFlags flags)

Check if query has scheduling mode set and flags is set in query scheduling flags.

parseAcceptCaps

void parseAcceptCaps(gst.caps.Caps caps)

Get the caps from query. The caps remains valid as long as query remains valid.

parseAcceptCapsResult

void parseAcceptCapsResult(bool result)

Parse the result from query and store in result.

parseAllocation

void parseAllocation(gst.caps.Caps caps, bool needPool)

Parse an allocation query, writing the requested caps in caps and whether a pool is needed in need_pool, if the respective parameters are non-null.

parseBitrate

void parseBitrate(uint nominalBitrate)

Get the results of a bitrate query. See also gst.query.Query.setBitrate.

parseBufferingPercent

void parseBufferingPercent(bool busy, int percent)

Get the percentage of buffered data. This is a value between 0 and 100. The busy indicator is true when the buffering is in progress.

parseBufferingRange

void parseBufferingRange(gst.types.Format format, long start, long stop, long estimatedTotal)

Parse an available query, writing the format into format, and other results into the passed parameters, if the respective parameters are non-null

parseBufferingStats

void parseBufferingStats(gst.types.BufferingMode mode, int avgIn, int avgOut, long bufferingLeft)

Extracts the buffering stats values from query.

parseCaps

void parseCaps(gst.caps.Caps filter)

Get the filter from the caps query. The caps remains valid as long as query remains valid.

parseCapsResult

void parseCapsResult(gst.caps.Caps caps)

Get the caps result from query. The caps remains valid as long as query remains valid.

parseContext

void parseContext(gst.context.Context context)

Get the context from the context query. The context remains valid as long as query remains valid.

parseContextType

bool parseContextType(string contextType)

Parse a context type from an existing GST_QUERY_CONTEXT query.

parseConvert

void parseConvert(gst.types.Format srcFormat, long srcValue, gst.types.Format destFormat, long destValue)

Parse a convert query answer. Any of src_format, src_value, dest_format, and dest_value may be null, in which case that value is omitted.

parseDuration

void parseDuration(gst.types.Format format, long duration)

Parse a duration query answer. Write the format of the duration into format, and the value into duration, if the respective variables are non-null.

parseLatency

void parseLatency(bool live, gst.types.ClockTime minLatency, gst.types.ClockTime maxLatency)

Parse a latency query answer.

parseNFormats

void parseNFormats(uint nFormats)

Parse the number of formats in the formats query.

parseNthAllocationMeta

gobject.types.GType parseNthAllocationMeta(uint index, gst.structure.Structure params)

Parse an available query and get the metadata API at index of the metadata API array.

parseNthAllocationParam

void parseNthAllocationParam(uint index, gst.allocator.Allocator allocator, gst.allocation_params.AllocationParams params)

Parse an available query and get the allocator and its params at index of the allocator array.

parseNthAllocationPool

void parseNthAllocationPool(uint index, gst.buffer_pool.BufferPool pool, uint size, uint minBuffers, uint maxBuffers)

Get the pool parameters in query.

parseNthBufferingRange

bool parseNthBufferingRange(uint index, long start, long stop)

Parse an available query and get the start and stop values stored at the index of the buffered ranges array.

parseNthFormat

void parseNthFormat(uint nth, gst.types.Format format)

Parse the format query and retrieve the nth format from it into format. If the list contains less elements than nth, format will be set to GST_FORMAT_UNDEFINED.

parseNthSchedulingMode

gst.types.PadMode parseNthSchedulingMode(uint index)

Parse an available query and get the scheduling mode at index of the scheduling modes array.

parsePosition

void parsePosition(gst.types.Format format, long cur)

Parse a position query, writing the format into format, and the position into cur, if the respective parameters are non-null.

parseScheduling

void parseScheduling(gst.types.SchedulingFlags flags, int minsize, int maxsize, int align_)

Set the scheduling properties.

parseSeeking

void parseSeeking(gst.types.Format format, bool seekable, long segmentStart, long segmentEnd)

Parse a seeking query, writing the format into format, and other results into the passed parameters, if the respective parameters are non-null

parseSegment

void parseSegment(double rate, gst.types.Format format, long startValue, long stopValue)

Parse a segment query answer. Any of rate, format, start_value, and stop_value may be null, which will cause this value to be omitted.

parseSelectable

void parseSelectable(bool selectable)

Get the results of a selectable query. See also gst.query.Query.setSelectable.

parseUri

void parseUri(string uri)

Parse an URI query, writing the URI into uri as a newly allocated string, if the respective parameters are non-null. Free the string with glib.global.gfree after usage.

parseUriRedirection

void parseUriRedirection(string uri)

Parse an URI query, writing the URI into uri as a newly allocated string, if the respective parameters are non-null. Free the string with glib.global.gfree after usage.

parseUriRedirectionPermanent

void parseUriRedirectionPermanent(bool permanent)

Parse an URI query, and set permanent to true if there is a redirection and it should be considered permanent. If a redirection is permanent, applications should update their internal storage of the URI, otherwise they should make all future requests to the original URI.

removeNthAllocationMeta

void removeNthAllocationMeta(uint index)

Remove the metadata API at index of the metadata API array.

removeNthAllocationParam

void removeNthAllocationParam(uint index)

Remove the allocation param at index of the allocation param array.

removeNthAllocationPool

void removeNthAllocationPool(uint index)

Remove the allocation pool at index of the allocation pool array.

setAcceptCapsResult

void setAcceptCapsResult(bool result)

Set result as the result for the query.

setBitrate

void setBitrate(uint nominalBitrate)

Set the results of a bitrate query. The nominal bitrate is the average bitrate expected over the length of the stream as advertised in file headers (or similar).

setBufferingPercent

void setBufferingPercent(bool busy, int percent)

Set the percentage of buffered data. This is a value between 0 and 100. The busy indicator is true when the buffering is in progress.

setBufferingRange

void setBufferingRange(gst.types.Format format, long start, long stop, long estimatedTotal)

Set the available query result fields in query.

setBufferingStats

void setBufferingStats(gst.types.BufferingMode mode, int avgIn, int avgOut, long bufferingLeft)

Configures the buffering stats values in query.

setCapsResult

void setCapsResult(gst.caps.Caps caps)

Set the caps result in query.

setContext

void setContext(gst.context.Context context)

Answer a context query by setting the requested context.

setConvert

void setConvert(gst.types.Format srcFormat, long srcValue, gst.types.Format destFormat, long destValue)

Answer a convert query by setting the requested values.

setDuration

void setDuration(gst.types.Format format, long duration)

Answer a duration query by setting the requested value in the given format.

setFormatsv

void setFormatsv(gst.types.Format[] formats)

Set the formats query result fields in query. The number of formats passed in the formats array must be equal to n_formats.

setLatency

void setLatency(bool live, gst.types.ClockTime minLatency, gst.types.ClockTime maxLatency)

Answer a latency query by setting the requested values in the given format.

setNthAllocationParam

void setNthAllocationParam(uint index, gst.allocator.Allocator allocator, gst.allocation_params.AllocationParams params)

Parse an available query and get the allocator and its params at index of the allocator array.

setNthAllocationPool

void setNthAllocationPool(uint index, gst.buffer_pool.BufferPool pool, uint size, uint minBuffers, uint maxBuffers)

Set the pool parameters in query.

setPosition

void setPosition(gst.types.Format format, long cur)

Answer a position query by setting the requested value in the given format.

setScheduling

void setScheduling(gst.types.SchedulingFlags flags, int minsize, int maxsize, int align_)

Set the scheduling properties.

setSeeking

void setSeeking(gst.types.Format format, bool seekable, long segmentStart, long segmentEnd)

Set the seeking query result fields in query.

setSegment

void setSegment(double rate, gst.types.Format format, long startValue, long stopValue)

Answer a segment query by setting the requested values. The normal playback segment of a pipeline is 0 to duration at the default rate of 1.0. If a seek was performed on the pipeline to play a different segment, this query will return the range specified in the last seek.

setSelectable

void setSelectable(bool selectable)

Set the results of a selectable query. If the element answering the query can handle stream selection, selectable should be set to true.

setUri

void setUri(string uri)

Answer a URI query by setting the requested URI.

setUriRedirection

void setUriRedirection(string uri)

Answer a URI query by setting the requested URI redirection.

setUriRedirectionPermanent

void setUriRedirectionPermanent(bool permanent)

Answer a URI query by setting the requested URI redirection to permanent or not.

writableStructure

gst.structure.Structure writableStructure()

Get the structure of a query. This method should be called with a writable query so that the returned structure is guaranteed to be writable.

Static functions

newAcceptCaps

gst.query.Query newAcceptCaps(gst.caps.Caps caps)

Constructs a new query object for querying if caps are accepted.

newAllocation

gst.query.Query newAllocation(gst.caps.Caps caps, bool needPool)

Constructs a new query object for querying the allocation properties.

newBitrate

gst.query.Query newBitrate()

Constructs a new query object for querying the bitrate.

newBuffering

gst.query.Query newBuffering(gst.types.Format format)

Constructs a new query object for querying the buffering status of a stream.

newCaps

gst.query.Query newCaps(gst.caps.Caps filter)

Constructs a new query object for querying the caps.

newContext

gst.query.Query newContext(string contextType)

Constructs a new query object for querying the pipeline-local context.

newConvert

gst.query.Query newConvert(gst.types.Format srcFormat, long value, gst.types.Format destFormat)

Constructs a new convert query object. Use gst_query_unref() when done with it. A convert query is used to ask for a conversion between one format and another.

newCustom

gst.query.Query newCustom(gst.types.QueryType type, gst.structure.Structure structure)

Constructs a new custom query object. Use gst_query_unref() when done with it.

newDrain

gst.query.Query newDrain()

Constructs a new query object for querying the drain state.

newDuration

gst.query.Query newDuration(gst.types.Format format)

Constructs a new stream duration query object to query in the given format. Use gst_query_unref() when done with it. A duration query will give the total length of the stream.

newFormats

gst.query.Query newFormats()

Constructs a new query object for querying formats of the stream.

newLatency

gst.query.Query newLatency()

Constructs a new latency query object. Use gst_query_unref() when done with it. A latency query is usually performed by sinks to compensate for additional latency introduced by elements in the pipeline.

newPosition

gst.query.Query newPosition(gst.types.Format format)

Constructs a new query stream position query object. Use gst_query_unref() when done with it. A position query is used to query the current position of playback in the streams, in some format.

newScheduling

gst.query.Query newScheduling()

Constructs a new query object for querying the scheduling properties.

newSeeking

gst.query.Query newSeeking(gst.types.Format format)

Constructs a new query object for querying seeking properties of the stream.

newSegment

gst.query.Query newSegment(gst.types.Format format)

Constructs a new segment query object. Use gst_query_unref() when done with it. A segment query is used to discover information about the currently configured segment for playback.

newSelectable

gst.query.Query newSelectable()

Constructs a new query object for querying the stream selection capability.

newUri

gst.query.Query newUri()

Constructs a new query URI query object. Use gst_query_unref() when done with it. An URI query is used to query the current URI that is used by the source or sink.

Inherited Members

From Boxed

cInstancePtr

void* cInstancePtr;

Pointer to the C boxed value

getType

GType getType()

Get the GType of this boxed type.

gType

GType gType [@property getter]

Boxed GType property.

self

Boxed self()

Convenience method to return this cast to a type. For use in D with statements.

copy_

void* copy_()

Make a copy of the wrapped C boxed data.

boxedCopy

void* boxedCopy(void* cBoxed)

Copy a C boxed value using g_boxed_copy.

boxedFree

void boxedFree(void* cBoxed)

Free a C boxed value using g_boxed_free.

• Query