Mp4Extractor

public static final int FLAG_MARK_FIRST_VIDEO_TRACK_WITH_MAIN_ROLE = 8

Flag to mark the first video track encountered as ROLE_FLAG_MAIN and all subsequent video tracks as ROLE_FLAG_ALTERNATE.

public static final int FLAG_OMIT_TRACK_SAMPLE_TABLE = 256

Flag to omit allocating and populating the large per-sample arrays (offsets, sizes, timestamps, flags) within TrackSampleTable. This is used to reduce memory consumption in metadata retrieval scenarios where individual sample data is not required.

public static final int FLAG_READ_AUXILIARY_TRACKS = 64

Flag to extract the auxiliary tracks from the MP4 With Auxiliary Tracks Extension (MP4-AT) file format.

Either primary video tracks or auxiliary tracks (but not both) will be extracted based on the flag.

If the flag is set but the auxiliary tracks are not present, then it fallbacks to extract primary tracks instead.

See the file format at https://developer.android.com/media/platform/mp4-at-file-format.

public static final int FLAG_READ_SEF_DATA = 4

Flag to extract SlowMotionData metadata from Samsung Extension Format (SEF) slow motion videos.

public static final int FLAG_READ_WITHIN_GOP_SAMPLE_DEPENDENCIES = 32

Flag to extract additional sample dependency information, and mark output buffers with BUFFER_FLAG_NOT_DEPENDED_ON for H.264 video.

This class always marks the samples at the start of each group of picture (GOP) with BUFFER_FLAG_KEY_FRAME. Usually, key frames can be decoded independently, without depending on other samples.

Setting this flag enables elementary stream parsing to identify disposable samples that are not depended on by other samples. Any disposable sample can be safely omitted, and the rest of the track will remain valid.

public static final int FLAG_READ_WITHIN_GOP_SAMPLE_DEPENDENCIES_H265 = 128

Flag to extract additional sample dependency information, and mark output buffers with BUFFER_FLAG_NOT_DEPENDED_ON for H.265 video.

See FLAG_READ_WITHIN_GOP_SAMPLE_DEPENDENCIES.

public static final int FLAG_WORKAROUND_IGNORE_EDIT_LISTS = 1

Flag to ignore any edit lists in the stream.

public Mp4Extractor(SubtitleParser.Factory subtitleParserFactory)

Creates a new extractor for unfragmented MP4 streams.

public Mp4Extractor(
    SubtitleParser.Factory subtitleParserFactory,
    @Mp4Extractor.Flags int flags
)

Creates a new extractor for unfragmented MP4 streams, using the specified flags to control the extractor's behavior.

@Mp4Extractor.Flags
public static int codecsToParseWithinGopSampleDependenciesAsFlags(
    @C.VideoCodecFlags int videoCodecFlags
)

Returns Flags denoting if an extractor should parse within GOP sample dependencies.

public long[] getSampleTimestampsUs(int trackId)

Returns the list of sample timestamps of a trackId, in microseconds.

public ImmutableList<SniffFailure> getSniffFailureDetails()

Returns additional details about the last call to sniff. The returned list may be empty if no additional details are available, or the last sniff call returned true.

This only contains details that were discovered before sniff returned false, it is not an exhaustive list of issues which, if resolved, would cause the file to be successfully sniffed.

public void init(ExtractorOutput output)

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

public static ExtractorsFactory newFactory(SubtitleParser.Factory subtitleParserFactory)

Creates a factory for Mp4Extractor instances with the provided SubtitleParser.Factory.

public int read(ExtractorInput input, PositionHolder seekPosition)

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 ExtractorInput 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.

public void release()

Releases all kept resources.

public void seek(long position, long timeUs)

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.

public boolean sniff(ExtractorInput input)

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.