com.google.android.exoplayer.util

Class MpegAudioHeader

java.lang.Object

com.google.android.exoplayer.util.MpegAudioHeader

public final class MpegAudioHeader
extends Object

Representation of an MPEG audio frame header.

Field Summary

Fields

Modifier and Type	Field and Description
int	bitrate Bitrate of the frame in bit/s.
int	channels Number of audio channels in the frame.
int	frameSize Size of the frame associated with this header, in bytes.
static int	MAX_FRAME_SIZE_BYTES Theoretical maximum frame size for an MPEG audio stream, which occurs when playing a Layer 2 MPEG 2.5 audio stream at 16 kb/s (with padding).
String	mimeType The mime type.
int	sampleRate Sample rate in samples per second.
int	samplesPerFrame Number of samples stored in the frame.
int	version MPEG audio header version.

Constructor Summary

Constructors

Constructor and Description
MpegAudioHeader()

Method Summary

Modifier and Type	Method and Description
static int	getFrameSize(int header) Returns the size of the frame associated with header, or -1 if it is invalid.
static boolean	populateHeader(int headerData, MpegAudioHeader header) Parses headerData, populating header with the parsed data.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

MAX_FRAME_SIZE_BYTES

public static final int MAX_FRAME_SIZE_BYTES

Theoretical maximum frame size for an MPEG audio stream, which occurs when playing a Layer 2 MPEG 2.5 audio stream at 16 kb/s (with padding). The size is 1152 sample/frame * 160000 bit/s / (8000 sample/s * 8 bit/byte) + 1 padding byte/frame = 2881 byte/frame. The next power of two size is 4 KiB.

See Also:

Constant Field Values

version

public int version

MPEG audio header version.

mimeType

public String mimeType

The mime type.

frameSize

public int frameSize

Size of the frame associated with this header, in bytes.

sampleRate

public int sampleRate

Sample rate in samples per second.

channels

public int channels

Number of audio channels in the frame.

bitrate

public int bitrate

Bitrate of the frame in bit/s.

samplesPerFrame

public int samplesPerFrame

Number of samples stored in the frame.

Constructor Detail

MpegAudioHeader

public MpegAudioHeader()

Method Detail

getFrameSize

public static int getFrameSize(int header)

Returns the size of the frame associated with header, or -1 if it is invalid.

populateHeader

public static boolean populateHeader(int headerData,
                                     MpegAudioHeader header)

Parses headerData, populating header with the parsed data.

Parameters:

headerData - Header data to parse.

header - Header to populate with data from headerData.

Returns:

True if the header was populated. False otherwise, indicating that headerData is not a valid MPEG audio header.