@UnstableApi
class PngExtractor : Extractor


Extracts data from the PNG container format.

Summary

Public constructors

Creates an instance.

Public functions

Unit

Initializes the extractor with an ExtractorOutput.

Int

Extracts data read from a provided ExtractorInput.

Unit

Releases all kept resources.

Unit
seek(position: Long, timeUs: Long)

Notifies the extractor that a seek has occurred.

Boolean

Returns whether this extractor can extract samples from the ExtractorInput, which must provide data from the start of the stream.

Inherited Constants

From androidx.media3.extractor.Extractor
const Int

Returned by read if the ExtractorInput passed to the next read is required to provide data continuing from the position in the stream reached by the returning call.

const Int

Returned by read if the end of the was reached.

const Int

Returned by read if the ExtractorInput passed to the next read is required to provide data starting from a specified position in the stream.

Inherited functions

From androidx.media3.extractor.Extractor
(Mutable)List<SniffFailure!>!

Returns additional details about the last call to sniff.

Extractor!

Returns the 'real' Extractor implementation if this is a delegating instance, or this if this instance does the extraction directly without delegating (the default behaviour).

Public constructors

PngExtractor

PngExtractor()

Creates an instance.

Public functions

init

fun init(output: ExtractorOutput!): Unit

Initializes the extractor with an ExtractorOutput. Called at most once.

Parameters
output: ExtractorOutput!

An ExtractorOutput to receive extracted data.

read

@Extractor.ReadResult
fun read(input: ExtractorInput!, seekPosition: PositionHolder!): Int

Extracts data read from a provided ExtractorInput. Must not be called before init.

A single call to this method will block until some progress has been made, but will not block for longer than this. Hence each call will consume only a small amount of input data.

In the common case, RESULT_CONTINUE is returned to indicate that the passed to the next read is required to provide data continuing from the position in the stream reached by the returning call. If the extractor requires data to be provided from a different position, then that position is set in seekPosition and RESULT_SEEK is returned. If the extractor reached the end of the data provided by the ExtractorInput, then RESULT_END_OF_INPUT is returned.

When this method throws an IOException, extraction may continue by providing an ExtractorInput with an unchanged read position to a subsequent call to this method.

Parameters
input: ExtractorInput!

The ExtractorInput from which data should be read.

seekPosition: PositionHolder!

If RESULT_SEEK is returned, this holder is updated to hold the position of the required data.

Returns
Int

One of the RESULT_ values defined in this interface.

Throws
java.io.IOException

If an error occurred reading from or parsing the input.

release

fun release(): Unit

Releases all kept resources.

seek

fun seek(position: Long, timeUs: Long): Unit

Notifies the extractor that a seek has occurred.

Following a call to this method, the ExtractorInput passed to the next invocation of read is required to provide data starting from position in the stream. Valid random access positions are the start of the stream and positions that can be obtained from any SeekMap passed to the ExtractorOutput.

Parameters
position: Long

The byte offset in the stream from which data will be provided.

timeUs: Long

The seek time in microseconds.

sniff

fun sniff(input: ExtractorInput!): Boolean

Returns whether this extractor can extract samples from the ExtractorInput, which must provide data from the start of the stream.

If true is returned, the input's reading position may have been modified. Otherwise, only its peek position may have been modified.

Parameters
input: ExtractorInput!

The ExtractorInput from which data should be peeked/read.

Returns
Boolean

Whether this extractor can read the provided input.

Throws
java.io.IOException

If an error occurred reading from the input.