FlacMetadataReader

Artifact: androidx.media3:media3-extractor

Kotlin |Java

@UnstableApi
class FlacMetadataReader

Reads and peeks FLAC stream metadata elements according to the FLAC format specification.

Summary

Nested types
`class FlacMetadataReader.FlacStreamMetadataHolder` Holds a `FlacStreamMetadata`.

Public functions
`java-static Boolean`	`checkAndPeekStreamMarker(input: ExtractorInput!)` Peeks the FLAC stream marker.
`java-static Int`	`getFrameStartMarker(input: ExtractorInput!)` Returns the frame start marker, consisting of the 2 first bytes of the first frame.
`java-static Metadata?`	`peekId3Metadata(input: ExtractorInput!, parseData: Boolean)` Peeks ID3 Data.
`java-static Metadata?`	`readId3Metadata(input: ExtractorInput!, parseData: Boolean)` Reads ID3 Data.
`java-static Boolean`	`readMetadataBlock( input: ExtractorInput!, metadataHolder: FlacMetadataReader.FlacStreamMetadataHolder! )` Reads one FLAC metadata block.
`java-static FlacStreamMetadata.SeekTable!`	`readSeekTableMetadataBlock(data: ParsableByteArray!)` Reads a FLAC seek table metadata block.
`java-static Unit`	`readStreamMarker(input: ExtractorInput!)` Reads the FLAC stream marker.

Public functions

checkAndPeekStreamMarker

java-static fun checkAndPeekStreamMarker(input: ExtractorInput!): Boolean

Peeks the FLAC stream marker.

Parameters
`input: ExtractorInput!`	Input stream to peek the stream marker from.

Returns
`Boolean`	Whether the data peeked is the FLAC stream marker.

Throws
`java.io.IOException`	If peeking from the input fails. In this case, the peek position is left unchanged.

getFrameStartMarker

java-static fun getFrameStartMarker(input: ExtractorInput!): Int

Returns the frame start marker, consisting of the 2 first bytes of the first frame.

The read position of input is left unchanged and the peek position is aligned with the read position.

Parameters
`input: ExtractorInput!`	Input stream to get the start marker from (starting from the read position).

Returns
`Int`	The frame start marker (which must be the same for all the frames in the stream).

Throws
`androidx.media3.common.ParserException`	If an error occurs parsing the frame start marker.
`java.io.IOException`	If peeking from the input fails.

peekId3Metadata

java-static fun peekId3Metadata(input: ExtractorInput!, parseData: Boolean): Metadata?

Peeks ID3 Data.

Parameters
`input: ExtractorInput!`	Input stream to peek the ID3 data from.
`parseData: Boolean`	Whether to parse the ID3 frames.

Returns
`Metadata?`	The parsed ID3 data, or `null` if there is no such data or if `parseData` is `false`.

Throws
`java.io.IOException`	If peeking from the input fails. In this case, there is no guarantee on the peek position.

readId3Metadata

java-static fun readId3Metadata(input: ExtractorInput!, parseData: Boolean): Metadata?

Reads ID3 Data.

If no exception is thrown, the peek position of input is aligned with the read position.

Parameters
`input: ExtractorInput!`	Input stream to read the ID3 data from.
`parseData: Boolean`	Whether to parse the ID3 frames.

Returns
`Metadata?`	The parsed ID3 data, or `null` if there is no such data or if `parseData` is `false`.

Throws
`java.io.IOException`	If reading from the input fails. In this case, the read position is left unchanged and there is no guarantee on the peek position.

readMetadataBlock

java-static fun readMetadataBlock(
    input: ExtractorInput!,
    metadataHolder: FlacMetadataReader.FlacStreamMetadataHolder!
): Boolean

Reads one FLAC metadata block.

If no exception is thrown, the peek position of input is aligned with the read position.

Parameters
`input: ExtractorInput!`	Input stream to read the metadata block from (header included).
`metadataHolder: FlacMetadataReader.FlacStreamMetadataHolder!`	A holder for the metadata read. If the stream info block (which must be the first metadata block) is read, the holder contains a new instance representing the stream info data. If the block read is a Vorbis comment block or a picture block, the holder contains a copy of the existing stream metadata with the corresponding metadata added. Otherwise, the metadata in the holder is unchanged.

Returns
`Boolean`	Whether the block read is the last metadata block.

Throws
`java.lang.IllegalArgumentException`	If the block read is not a stream info block and the metadata in `metadataHolder` is `null`. In this case, the read position will be at the start of a metadata block and there is no guarantee on the peek position.
`java.io.IOException`	If reading from the input fails. In this case, the read position will be at the start of a metadata block and there is no guarantee on the peek position.

readSeekTableMetadataBlock

java-static fun readSeekTableMetadataBlock(data: ParsableByteArray!): FlacStreamMetadata.SeekTable!

Reads a FLAC seek table metadata block.

The position of data is moved to the byte following the seek table metadata block (placeholder points included).

Parameters
`data: ParsableByteArray!`	The array to read the data from, whose position must correspond to the seek table metadata block (header included).

Returns
`FlacStreamMetadata.SeekTable!`	The seek table, without the placeholder points.

readStreamMarker

java-static fun readStreamMarker(input: ExtractorInput!): Unit

Reads the FLAC stream marker.

Parameters
`input: ExtractorInput!`	Input stream to read the stream marker from.

Throws
`androidx.media3.common.ParserException`	If an error occurs parsing the stream marker. In this case, the position of `input` is advanced by `STREAM_MARKER_SIZE` bytes.
`java.io.IOException`	If reading from the input fails. In this case, the position is left unchanged.

FlacMetadataReader

Summary

Nested types

Public functions

Public functions

checkAndPeekStreamMarker

getFrameStartMarker

peekId3Metadata

readId3Metadata

readMetadataBlock

readSeekTableMetadataBlock

readStreamMarker