Constant rsmpeg::ffi::AVPacketSideDataType_AV_PKT_DATA_REPLAYGAIN

pub const AVPacketSideDataType_AV_PKT_DATA_REPLAYGAIN: u32 = 4; // 0x0000_0004u32

This side data should be associated with an audio stream and contains ReplayGain information in form of the AVReplayGain struct.