Package com.google.android.exoplayer2.audio

Class OpusUtil

  • public class OpusUtil
extends Object
    Utility methods for handling Opus audio streams.

    • Field Detail

      • SAMPLE_RATE

        public static final int SAMPLE_RATE
        Opus streams are always 48000 Hz.
        See Also:
        Constant Field Values

      • MAX_BYTES_PER_SECOND

        public static final int MAX_BYTES_PER_SECOND
        Maximum achievable Opus bitrate.
        See Also:
        Constant Field Values

    • Method Detail

      • getChannelCount

        public static int getChannelCount​(byte[] header)
        Parses the channel count from an Opus Identification Header.
        Parameters:
        header - An Opus Identification Header, as defined by RFC 7845.
        Returns:
        The parsed channel count.

      • buildInitializationData

        public static List<byte[]> buildInitializationData​(byte[] header)
        Builds codec initialization data from an Opus Identification Header.
        Parameters:
        header - An Opus Identification Header, as defined by RFC 7845.
        Returns:
        Codec initialization data suitable for an Opus MediaCodec.

      • parsePacketAudioSampleCount

        public static int parsePacketAudioSampleCount​(ByteBuffer buffer)
        Returns the number of audio samples in the given audio packet.

        The buffer's position is not modified.

        Parameters:
        buffer - The audio packet.
        Returns:
        Returns the number of audio samples in the packet.

      • getPacketDurationUs

        public static long getPacketDurationUs​(byte[] buffer)
        Returns the duration of the given audio packet.
        Parameters:
        buffer - The audio packet.
        Returns:
        Returns the duration of the given audio packet, in microseconds.